diff options
Diffstat (limited to 'generic/tclIO.c')
| -rw-r--r-- | generic/tclIO.c | 12356 |
1 files changed, 7568 insertions, 4788 deletions
diff --git a/generic/tclIO.c b/generic/tclIO.c index 7ef54fb..58c7b3c 100644 --- a/generic/tclIO.c +++ b/generic/tclIO.c @@ -1,270 +1,19 @@ -/* +/* * tclIO.c -- * * This file provides the generic portions (those that are the same on * all platforms and for all channel types) of Tcl's IO facilities. * - * Copyright (c) 1998 Scriptics Corporation + * Copyright (c) 1998-2000 Ajuba Solutions * Copyright (c) 1995-1997 Sun Microsystems, Inc. * - * See the file "license.terms" for information on usage and redistribution - * of this file, and for a DISCLAIMER OF ALL WARRANTIES. - * - * RCS: @(#) $Id: tclIO.c,v 1.18 1999/12/08 03:49:52 hobbs Exp $ + * See the file "license.terms" for information on usage and redistribution of + * this file, and for a DISCLAIMER OF ALL WARRANTIES. */ #include "tclInt.h" -#include "tclPort.h" - -/* - * Make sure that both EAGAIN and EWOULDBLOCK are defined. This does not - * compile on systems where neither is defined. We want both defined so - * that we can test safely for both. In the code we still have to test for - * both because there may be systems on which both are defined and have - * different values. - */ - -#if ((!defined(EWOULDBLOCK)) && (defined(EAGAIN))) -# define EWOULDBLOCK EAGAIN -#endif -#if ((!defined(EAGAIN)) && (defined(EWOULDBLOCK))) -# define EAGAIN EWOULDBLOCK -#endif -#if ((!defined(EAGAIN)) && (!defined(EWOULDBLOCK))) - error one of EWOULDBLOCK or EAGAIN must be defined -#endif - -/* - * The following structure encapsulates the state for a background channel - * copy. Note that the data buffer for the copy will be appended to this - * structure. - */ - -typedef struct CopyState { - struct Channel *readPtr; /* Pointer to input channel. */ - struct Channel *writePtr; /* Pointer to output channel. */ - int readFlags; /* Original read channel flags. */ - int writeFlags; /* Original write channel flags. */ - int toRead; /* Number of bytes to copy, or -1. */ - int total; /* Total bytes transferred (written). */ - Tcl_Interp *interp; /* Interp that started the copy. */ - Tcl_Obj *cmdPtr; /* Command to be invoked at completion. */ - int bufSize; /* Size of appended buffer. */ - char buffer[1]; /* Copy buffer, this must be the last - * field. */ -} CopyState; - -/* - * struct ChannelBuffer: - * - * Buffers data being sent to or from a channel. - */ - -typedef struct ChannelBuffer { - int nextAdded; /* The next position into which a character - * will be put in the buffer. */ - int nextRemoved; /* Position of next byte to be removed - * from the buffer. */ - int bufLength; /* How big is the buffer? */ - struct ChannelBuffer *nextPtr; - /* Next buffer in chain. */ - char buf[4]; /* Placeholder for real buffer. The real - * buffer occuppies this space + bufSize-4 - * bytes. This must be the last field in - * the structure. */ -} ChannelBuffer; - -#define CHANNELBUFFER_HEADER_SIZE (sizeof(ChannelBuffer) - 4) - -/* - * How much extra space to allocate in buffer to hold bytes from previous - * buffer (when converting to UTF-8) or to hold bytes that will go to - * next buffer (when converting from UTF-8). - */ - -#define BUFFER_PADDING 16 - -/* - * The following defines the *default* buffer size for channels. - */ - -#define CHANNELBUFFER_DEFAULT_SIZE (1024 * 4) - -/* - * Structure to record a close callback. One such record exists for - * each close callback registered for a channel. - */ - -typedef struct CloseCallback { - Tcl_CloseProc *proc; /* The procedure to call. */ - ClientData clientData; /* Arbitrary one-word data to pass - * to the callback. */ - struct CloseCallback *nextPtr; /* For chaining close callbacks. */ -} CloseCallback; - -/* - * The following structure describes the information saved from a call to - * "fileevent". This is used later when the event being waited for to - * invoke the saved script in the interpreter designed in this record. - */ - -typedef struct EventScriptRecord { - struct Channel *chanPtr; /* The channel for which this script is - * registered. This is used only when an - * error occurs during evaluation of the - * script, to delete the handler. */ - Tcl_Obj *scriptPtr; /* Script to invoke. */ - Tcl_Interp *interp; /* In what interpreter to invoke script? */ - int mask; /* Events must overlap current mask for the - * stored script to be invoked. */ - struct EventScriptRecord *nextPtr; - /* Next in chain of records. */ -} EventScriptRecord; - -/* - * struct Channel: - * - * One of these structures is allocated for each open channel. It contains data - * specific to the channel but which belongs to the generic part of the Tcl - * channel mechanism, and it points at an instance specific (and type - * specific) * instance data, and at a channel type structure. - */ - -typedef struct Channel { - char *channelName; /* The name of the channel instance in Tcl - * commands. Storage is owned by the generic IO - * code, is dynamically allocated. */ - int flags; /* ORed combination of the flags defined - * below. */ - Tcl_Encoding encoding; /* Encoding to apply when reading or writing - * data on this channel. NULL means no - * encoding is applied to data. */ - Tcl_EncodingState inputEncodingState; - /* Current encoding state, used when converting - * input data bytes to UTF-8. */ - int inputEncodingFlags; /* Encoding flags to pass to conversion - * routine when converting input data bytes to - * UTF-8. May be TCL_ENCODING_START before - * converting first byte and TCL_ENCODING_END - * when EOF is seen. */ - Tcl_EncodingState outputEncodingState; - /* Current encoding state, used when converting - * UTF-8 to output data bytes. */ - int outputEncodingFlags; /* Encoding flags to pass to conversion - * routine when converting UTF-8 to output - * data bytes. May be TCL_ENCODING_START - * before converting first byte and - * TCL_ENCODING_END when EOF is seen. */ - Tcl_EolTranslation inputTranslation; - /* What translation to apply for end of line - * sequences on input? */ - Tcl_EolTranslation outputTranslation; - /* What translation to use for generating - * end of line sequences in output? */ - int inEofChar; /* If nonzero, use this as a signal of EOF - * on input. */ - int outEofChar; /* If nonzero, append this to the channel - * when it is closed if it is open for - * writing. */ - int unreportedError; /* Non-zero if an error report was deferred - * because it happened in the background. The - * value is the POSIX error code. */ - ClientData instanceData; /* Instance-specific data provided by - * creator of channel. */ - - Tcl_ChannelType *typePtr; /* Pointer to channel type structure. */ - int refCount; /* How many interpreters hold references to - * this IO channel? */ - CloseCallback *closeCbPtr; /* Callbacks registered to be called when the - * channel is closed. */ - char *outputStage; /* Temporary staging buffer used when - * translating EOL before converting from - * UTF-8 to external form. */ - ChannelBuffer *curOutPtr; /* Current output buffer being filled. */ - ChannelBuffer *outQueueHead;/* Points at first buffer in output queue. */ - ChannelBuffer *outQueueTail;/* Points at last buffer in output queue. */ - - ChannelBuffer *saveInBufPtr;/* Buffer saved for input queue - eliminates - * need to allocate a new buffer for "gets" - * that crosses buffer boundaries. */ - ChannelBuffer *inQueueHead; /* Points at first buffer in input queue. */ - ChannelBuffer *inQueueTail; /* Points at last buffer in input queue. */ - - struct ChannelHandler *chPtr;/* List of channel handlers registered - * for this channel. */ - int interestMask; /* Mask of all events this channel has - * handlers for. */ - struct Channel *nextChanPtr;/* Next in list of channels currently open. */ - EventScriptRecord *scriptRecordPtr; - /* Chain of all scripts registered for - * event handlers ("fileevent") on this - * channel. */ - int bufSize; /* What size buffers to allocate? */ - Tcl_TimerToken timer; /* Handle to wakeup timer for this channel. */ - CopyState *csPtr; /* State of background copy, or NULL. */ - struct Channel* supercedes; /* Refers to channel this one was stacked upon. - This reference is NULL for normal channels. - See Tcl_StackChannel. */ - -} Channel; - -/* - * Values for the flags field in Channel. Any ORed combination of the - * following flags can be stored in the field. These flags record various - * options and state bits about the channel. In addition to the flags below, - * the channel can also have TCL_READABLE (1<<1) and TCL_WRITABLE (1<<2) set. - */ - -#define CHANNEL_NONBLOCKING (1<<3) /* Channel is currently in - * nonblocking mode. */ -#define CHANNEL_LINEBUFFERED (1<<4) /* Output to the channel must be - * flushed after every newline. */ -#define CHANNEL_UNBUFFERED (1<<5) /* Output to the channel must always - * be flushed immediately. */ -#define BUFFER_READY (1<<6) /* Current output buffer (the - * curOutPtr field in the - * channel structure) should be - * output as soon as possible even - * though it may not be full. */ -#define BG_FLUSH_SCHEDULED (1<<7) /* A background flush of the - * queued output buffers has been - * scheduled. */ -#define CHANNEL_CLOSED (1<<8) /* Channel has been closed. No - * further Tcl-level IO on the - * channel is allowed. */ -#define CHANNEL_EOF (1<<9) /* EOF occurred on this channel. - * This bit is cleared before every - * input operation. */ -#define CHANNEL_STICKY_EOF (1<<10) /* EOF occurred on this channel because - * we saw the input eofChar. This bit - * prevents clearing of the EOF bit - * before every input operation. */ -#define CHANNEL_BLOCKED (1<<11) /* EWOULDBLOCK or EAGAIN occurred - * on this channel. This bit is - * cleared before every input or - * output operation. */ -#define INPUT_SAW_CR (1<<12) /* Channel is in CRLF eol input - * translation mode and the last - * byte seen was a "\r". */ -#define INPUT_NEED_NL (1<<15) /* Saw a '\r' at end of last buffer, - * and there should be a '\n' at - * beginning of next buffer. */ -#define CHANNEL_DEAD (1<<13) /* The channel has been closed by - * the exit handler (on exit) but - * not deallocated. When any IO - * operation sees this flag on a - * channel, it does not call driver - * level functions to avoid referring - * to deallocated data. */ -#define CHANNEL_NEED_MORE_DATA (1<<14) /* The last input operation failed - * because there was not enough data - * to complete the operation. This - * flag is set when gets fails to - * get a complete line or when read - * fails to get a complete character. - * When set, file events will not be - * delivered for buffered data until - * the state of the channel changes. */ +#include "tclIO.h" +#include <assert.h> /* * For each channel handler registered in a call to Tcl_CreateChannelHandler, @@ -277,10 +26,10 @@ typedef struct ChannelHandler { Channel *chanPtr; /* The channel structure for this channel. */ int mask; /* Mask of desired events. */ Tcl_ChannelProc *proc; /* Procedure to call in the type of - * Tcl_CreateChannelHandler. */ + * Tcl_CreateChannelHandler. */ ClientData clientData; /* Argument to pass to procedure. */ struct ChannelHandler *nextPtr; - /* Next one in list of registered handlers. */ + /* Next one in list of registered handlers. */ } ChannelHandler; /* @@ -301,13 +50,12 @@ typedef struct ChannelHandler { typedef struct NextChannelHandler { ChannelHandler *nextHandlerPtr; /* The next handler to be invoked in - * this invocation. */ + * this invocation. */ struct NextChannelHandler *nestedHandlerPtr; /* Next nested invocation of - * ChannelHandlerEventProc. */ + * ChannelHandlerEventProc. */ } NextChannelHandler; - /* * The following structure describes the event that is added to the Tcl * event queue by the channel handler check procedure. @@ -323,7 +71,7 @@ typedef struct ChannelHandlerEvent { * The following structure is used by Tcl_GetsObj() to encapsulates the * state for a "gets" operation. */ - + typedef struct GetsState { Tcl_Obj *objPtr; /* The object to which UTF-8 characters * will be appended. */ @@ -350,126 +98,364 @@ typedef struct GetsState { } GetsState; /* - * All static variables used in this file are collected into a single - * instance of the following structure. For multi-threaded implementations, - * there is one instance of this structure for each thread. + * The following structure encapsulates the state for a background channel + * copy. Note that the data buffer for the copy will be appended to this + * structure. + */ + +typedef struct CopyState { + struct Channel *readPtr; /* Pointer to input channel. */ + struct Channel *writePtr; /* Pointer to output channel. */ + int readFlags; /* Original read channel flags. */ + int writeFlags; /* Original write channel flags. */ + Tcl_WideInt toRead; /* Number of bytes to copy, or -1. */ + Tcl_WideInt total; /* Total bytes transferred (written). */ + Tcl_Interp *interp; /* Interp that started the copy. */ + Tcl_Obj *cmdPtr; /* Command to be invoked at completion. */ + int bufSize; /* Size of appended buffer. */ + char buffer[1]; /* Copy buffer, this must be the last + * field. */ +} CopyState; + +/* + * All static variables used in this file are collected into a single instance + * of the following structure. For multi-threaded implementations, there is + * one instance of this structure for each thread. * - * Notice that different structures with the same name appear in other - * files. The structure defined below is used in this file only. + * Notice that different structures with the same name appear in other files. + * The structure defined below is used in this file only. */ typedef struct ThreadSpecificData { - - /* - * This variable holds the list of nested ChannelHandlerEventProc - * invocations. - */ NextChannelHandler *nestedHandlerPtr; - - /* - * List of all channels currently open. - */ - Channel *firstChanPtr; -#ifdef oldcode - /* - * Has a channel exit handler been created yet? - */ - int channelExitHandlerCreated; - - /* - * Has the channel event source been created and registered with the - * notifier? - */ - int channelEventSourceCreated; -#endif - /* - * Static variables to hold channels for stdin, stdout and stderr. - */ - Tcl_Channel stdinChannel; + /* This variable holds the list of nested + * ChannelHandlerEventProc invocations. */ + ChannelState *firstCSPtr; /* List of all channels currently open, + * indexed by ChannelState, as only one + * ChannelState exists per set of stacked + * channels. */ + Tcl_Channel stdinChannel; /* Static variable for the stdin channel. */ int stdinInitialized; - Tcl_Channel stdoutChannel; + Tcl_Channel stdoutChannel; /* Static variable for the stdout channel. */ int stdoutInitialized; - Tcl_Channel stderrChannel; + Tcl_Channel stderrChannel; /* Static variable for the stderr channel. */ int stderrInitialized; - + Tcl_Encoding binaryEncoding; } ThreadSpecificData; static Tcl_ThreadDataKey dataKey; +/* + * Structure to record a close callback. One such record exists for + * each close callback registered for a channel. + */ + +typedef struct CloseCallback { + Tcl_CloseProc *proc; /* The procedure to call. */ + ClientData clientData; /* Arbitrary one-word data to pass + * to the callback. */ + struct CloseCallback *nextPtr; /* For chaining close callbacks. */ +} CloseCallback; /* * Static functions in this file: */ -static ChannelBuffer * AllocChannelBuffer _ANSI_ARGS_((int length)); -static void ChannelEventScriptInvoker _ANSI_ARGS_(( - ClientData clientData, int flags)); -static void ChannelTimerProc _ANSI_ARGS_(( - ClientData clientData)); -static int CheckChannelErrors _ANSI_ARGS_((Channel *chanPtr, - int direction)); -static int CheckFlush _ANSI_ARGS_((Channel *chanPtr, - ChannelBuffer *bufPtr, int newlineFlag)); -static int CheckForDeadChannel _ANSI_ARGS_((Tcl_Interp *interp, - Channel *chan)); -static void CheckForStdChannelsBeingClosed _ANSI_ARGS_(( - Tcl_Channel chan)); -static void CleanupChannelHandlers _ANSI_ARGS_(( - Tcl_Interp *interp, Channel *chanPtr)); -static int CloseChannel _ANSI_ARGS_((Tcl_Interp *interp, - Channel *chanPtr, int errorCode)); -static void CommonGetsCleanup _ANSI_ARGS_((Channel *chanPtr, - Tcl_Encoding encoding)); -static int CopyAndTranslateBuffer _ANSI_ARGS_(( - Channel *chanPtr, char *result, int space)); -static int CopyData _ANSI_ARGS_((CopyState *csPtr, int mask)); -static void CopyEventProc _ANSI_ARGS_((ClientData clientData, - int mask)); -static void CreateScriptRecord _ANSI_ARGS_(( - Tcl_Interp *interp, Channel *chanPtr, - int mask, Tcl_Obj *scriptPtr)); -static void DeleteChannelTable _ANSI_ARGS_(( - ClientData clientData, Tcl_Interp *interp)); -static void DeleteScriptRecord _ANSI_ARGS_((Tcl_Interp *interp, - Channel *chanPtr, int mask)); -static void DiscardInputQueued _ANSI_ARGS_(( - Channel *chanPtr, int discardSavedBuffers)); -static void DiscardOutputQueued _ANSI_ARGS_(( - Channel *chanPtr)); -static int DoRead _ANSI_ARGS_((Channel *chanPtr, char *srcPtr, - int slen)); -static int DoWrite _ANSI_ARGS_((Channel *chanPtr, char *src, - int srcLen)); -static int FilterInputBytes _ANSI_ARGS_((Channel *chanPtr, - GetsState *statePtr)); -static int FlushChannel _ANSI_ARGS_((Tcl_Interp *interp, - Channel *chanPtr, int calledFromAsyncFlush)); -static Tcl_HashTable * GetChannelTable _ANSI_ARGS_((Tcl_Interp *interp)); -static int GetInput _ANSI_ARGS_((Channel *chanPtr)); -static void PeekAhead _ANSI_ARGS_((Channel *chanPtr, - char **dstEndPtr, GetsState *gsPtr)); -static int ReadBytes _ANSI_ARGS_((Channel *chanPtr, - Tcl_Obj *objPtr, int charsLeft, int *offsetPtr)); -static int ReadChars _ANSI_ARGS_((Channel *chanPtr, - Tcl_Obj *objPtr, int charsLeft, int *offsetPtr, - int *factorPtr)); -static void RecycleBuffer _ANSI_ARGS_((Channel *chanPtr, - ChannelBuffer *bufPtr, int mustDiscard)); -static int SetBlockMode _ANSI_ARGS_((Tcl_Interp *interp, - Channel *chanPtr, int mode)); -static void StopCopy _ANSI_ARGS_((CopyState *csPtr)); -static int TranslateInputEOL _ANSI_ARGS_((Channel *chanPtr, - char *dst, CONST char *src, int *dstLenPtr, - int *srcLenPtr)); -static int TranslateOutputEOL _ANSI_ARGS_((Channel *chanPtr, - char *dst, CONST char *src, int *dstLenPtr, - int *srcLenPtr)); -static void UpdateInterest _ANSI_ARGS_((Channel *chanPtr)); -static int WriteBytes _ANSI_ARGS_((Channel *chanPtr, - CONST char *src, int srcLen)); -static int WriteChars _ANSI_ARGS_((Channel *chanPtr, - CONST char *src, int srcLen)); +static ChannelBuffer * AllocChannelBuffer(int length); +static void PreserveChannelBuffer(ChannelBuffer *bufPtr); +static void ReleaseChannelBuffer(ChannelBuffer *bufPtr); +static int IsShared(ChannelBuffer *bufPtr); +static void ChannelTimerProc(ClientData clientData); +static int CheckChannelErrors(ChannelState *statePtr, + int direction); +static int CheckForDeadChannel(Tcl_Interp *interp, + ChannelState *statePtr); +static void CheckForStdChannelsBeingClosed(Tcl_Channel chan); +static void CleanupChannelHandlers(Tcl_Interp *interp, + Channel *chanPtr); +static int CloseChannel(Tcl_Interp *interp, Channel *chanPtr, + int errorCode); +static int CloseChannelPart(Tcl_Interp *interp, Channel *chanPtr, + int errorCode, int flags); +static int CloseWrite(Tcl_Interp *interp, Channel *chanPtr); +static void CommonGetsCleanup(Channel *chanPtr); +static int CopyAndTranslateBuffer(ChannelState *statePtr, + char *result, int space); +static int CopyBuffer(Channel *chanPtr, char *result, int space); +static int CopyData(CopyState *csPtr, int mask); +static void CopyEventProc(ClientData clientData, int mask); +static void CreateScriptRecord(Tcl_Interp *interp, + Channel *chanPtr, int mask, Tcl_Obj *scriptPtr); +static void DeleteChannelTable(ClientData clientData, + Tcl_Interp *interp); +static void DeleteScriptRecord(Tcl_Interp *interp, + Channel *chanPtr, int mask); +static int DetachChannel(Tcl_Interp *interp, Tcl_Channel chan); +static void DiscardInputQueued(ChannelState *statePtr, + int discardSavedBuffers); +static void DiscardOutputQueued(ChannelState *chanPtr); +static int DoRead(Channel *chanPtr, char *srcPtr, int slen, int allowShortReads); +static int DoReadChars(Channel *chan, Tcl_Obj *objPtr, int toRead, + int appendFlag); +static int FilterInputBytes(Channel *chanPtr, + GetsState *statePtr); +static int FlushChannel(Tcl_Interp *interp, Channel *chanPtr, + int calledFromAsyncFlush); +static int TclGetsObjBinary(Tcl_Channel chan, Tcl_Obj *objPtr); +static Tcl_Encoding GetBinaryEncoding(); +static void FreeBinaryEncoding(ClientData clientData); +static Tcl_HashTable * GetChannelTable(Tcl_Interp *interp); +static int GetInput(Channel *chanPtr); +static int HaveVersion(const Tcl_ChannelType *typePtr, + Tcl_ChannelTypeVersion minimumVersion); +static void PeekAhead(Channel *chanPtr, char **dstEndPtr, + GetsState *gsPtr); +static int ReadBytes(ChannelState *statePtr, Tcl_Obj *objPtr, + int charsLeft, int *offsetPtr); +static int ReadChars(ChannelState *statePtr, Tcl_Obj *objPtr, + int charsLeft, int *offsetPtr, int *factorPtr); +static void RecycleBuffer(ChannelState *statePtr, + ChannelBuffer *bufPtr, int mustDiscard); +static int StackSetBlockMode(Channel *chanPtr, int mode); +static int SetBlockMode(Tcl_Interp *interp, Channel *chanPtr, + int mode); +static void StopCopy(CopyState *csPtr); +static int TranslateInputEOL(ChannelState *statePtr, char *dst, + const char *src, int *dstLenPtr, int *srcLenPtr); +static void UpdateInterest(Channel *chanPtr); +static int Write(Channel *chanPtr, const char *src, + int srcLen, Tcl_Encoding encoding); +static Tcl_Obj * FixLevelCode(Tcl_Obj *msg); +static void SpliceChannel(Tcl_Channel chan); +static void CutChannel(Tcl_Channel chan); +static int WillRead(Channel *chanPtr); + +#define WriteChars(chanPtr, src, srcLen) \ + Write(chanPtr, src, srcLen, chanPtr->state->encoding) +#define WriteBytes(chanPtr, src, srcLen) \ + Write(chanPtr, src, srcLen, tclIdentityEncoding) + +/* + * Simplifying helper macros. All may use their argument(s) multiple times. + * The ANSI C "prototypes" for the macros are listed below, together with a + * short description of what the macro does. + * + * -------------------------------------------------------------------------- + * int BytesLeft(ChannelBuffer *bufPtr) + * + * Returns the number of bytes of data remaining in the buffer. + * + * int SpaceLeft(ChannelBuffer *bufPtr) + * + * Returns the number of bytes of space remaining at the end of the + * buffer. + * + * int IsBufferReady(ChannelBuffer *bufPtr) + * + * Returns whether a buffer has bytes available within it. + * + * int IsBufferEmpty(ChannelBuffer *bufPtr) + * + * Returns whether a buffer is entirely empty. Note that this is not the + * inverse of the above operation; trying to merge the two seems to lead + * to occasional crashes... + * + * int IsBufferFull(ChannelBuffer *bufPtr) + * + * Returns whether more data can be added to a buffer. + * + * int IsBufferOverflowing(ChannelBuffer *bufPtr) + * + * Returns whether a buffer has more data in it than it should. + * + * char *InsertPoint(ChannelBuffer *bufPtr) + * + * Returns a pointer to where characters should be added to the buffer. + * + * char *RemovePoint(ChannelBuffer *bufPtr) + * + * Returns a pointer to where characters should be removed from the + * buffer. + * -------------------------------------------------------------------------- + */ + +#define BytesLeft(bufPtr) ((bufPtr)->nextAdded - (bufPtr)->nextRemoved) + +#define SpaceLeft(bufPtr) ((bufPtr)->bufLength - (bufPtr)->nextAdded) + +#define IsBufferReady(bufPtr) ((bufPtr)->nextAdded > (bufPtr)->nextRemoved) + +#define IsBufferEmpty(bufPtr) ((bufPtr)->nextAdded == (bufPtr)->nextRemoved) + +#define IsBufferFull(bufPtr) ((bufPtr)->nextAdded >= (bufPtr)->bufLength) + +#define IsBufferOverflowing(bufPtr) ((bufPtr)->nextAdded>(bufPtr)->bufLength) + +#define InsertPoint(bufPtr) ((bufPtr)->buf + (bufPtr)->nextAdded) + +#define RemovePoint(bufPtr) ((bufPtr)->buf + (bufPtr)->nextRemoved) + +/* + * For working with channel state flag bits. + */ + +#define SetFlag(statePtr, flag) ((statePtr)->flags |= (flag)) +#define ResetFlag(statePtr, flag) ((statePtr)->flags &= ~(flag)) +#define GotFlag(statePtr, flag) ((statePtr)->flags & (flag)) + +/* + * Macro for testing whether a string (in optionName, length len) matches a + * value (prefix matching rules). Arguments are the minimum length to match + * and the value to match against. (Can't use Tcl_GetIndexFromObj as this is + * used in a situation where no objects are available.) + */ + +#define HaveOpt(minLength, nameString) \ + ((len > (minLength)) && (optionName[1] == (nameString)[1]) \ + && (strncmp(optionName, (nameString), len) == 0)) + +/* + * The ChannelObjType type. We actually store the ChannelState structure + * as that lives longest and we want to return the bottomChanPtr when + * requested (consistent with Tcl_GetChannel). The setFromAny and + * updateString can be NULL as they should not be called. + */ + +static void DupChannelIntRep(Tcl_Obj *objPtr, Tcl_Obj *copyPtr); +static int SetChannelFromAny(Tcl_Interp *interp, + Tcl_Obj *objPtr); +static void FreeChannelIntRep(Tcl_Obj *objPtr); + +static const Tcl_ObjType chanObjType = { + "channel", /* name for this type */ + FreeChannelIntRep, /* freeIntRepProc */ + DupChannelIntRep, /* dupIntRepProc */ + NULL, /* updateStringProc */ + NULL /* setFromAnyProc SetChannelFromAny */ +}; + +#define GET_CHANNELSTATE(objPtr) \ + ((ChannelState *) (objPtr)->internalRep.twoPtrValue.ptr1) +#define SET_CHANNELSTATE(objPtr, storePtr) \ + ((objPtr)->internalRep.twoPtrValue.ptr1 = (void *) (storePtr)) +#define GET_CHANNELINTERP(objPtr) \ + ((Tcl_Interp *) (objPtr)->internalRep.twoPtrValue.ptr2) +#define SET_CHANNELINTERP(objPtr, storePtr) \ + ((objPtr)->internalRep.twoPtrValue.ptr2 = (void *) (storePtr)) + +#define BUSY_STATE(st, fl) \ + ((((st)->csPtrR) && ((fl) & TCL_READABLE)) || \ + (((st)->csPtrW) && ((fl) & TCL_WRITABLE))) + +#define MAX_CHANNEL_BUFFER_SIZE (1024*1024) + +/* + *--------------------------------------------------------------------------- + * + * ChanClose, ChanRead, ChanSeek, ChanThreadAction, ChanWatch, ChanWrite -- + * + * Simplify the access to selected channel driver "methods" that are used + * in multiple places in a stereotypical fashion. These are just thin + * wrappers around the driver functions. + * + *--------------------------------------------------------------------------- + */ + +static inline int +ChanClose( + Channel *chanPtr, + Tcl_Interp *interp) +{ + if (chanPtr->typePtr->closeProc != TCL_CLOSE2PROC) { + return chanPtr->typePtr->closeProc(chanPtr->instanceData, interp); + } else { + return chanPtr->typePtr->close2Proc(chanPtr->instanceData, interp, 0); + } +} + +static inline int +ChanCloseHalf( + Channel *chanPtr, + Tcl_Interp *interp, + int flags) +{ + return chanPtr->typePtr->close2Proc(chanPtr->instanceData, interp, flags); +} + +static inline int +ChanRead( + Channel *chanPtr, + char *dst, + int dstSize, + int *errnoPtr) +{ + if (WillRead(chanPtr) < 0) { + *errnoPtr = Tcl_GetErrno(); + return -1; + } + + return chanPtr->typePtr->inputProc(chanPtr->instanceData, dst, dstSize, + errnoPtr); +} + +static inline Tcl_WideInt +ChanSeek( + Channel *chanPtr, + Tcl_WideInt offset, + int mode, + int *errnoPtr) +{ + /* + * Note that we prefer the wideSeekProc if that field is available in the + * type and non-NULL. + */ + + if (HaveVersion(chanPtr->typePtr, TCL_CHANNEL_VERSION_3) && + chanPtr->typePtr->wideSeekProc != NULL) { + return chanPtr->typePtr->wideSeekProc(chanPtr->instanceData, + offset, mode, errnoPtr); + } + + if (offset<Tcl_LongAsWide(LONG_MIN) || offset>Tcl_LongAsWide(LONG_MAX)) { + *errnoPtr = EOVERFLOW; + return Tcl_LongAsWide(-1); + } + + return Tcl_LongAsWide(chanPtr->typePtr->seekProc(chanPtr->instanceData, + Tcl_WideAsLong(offset), mode, errnoPtr)); +} + +static inline void +ChanThreadAction( + Channel *chanPtr, + int action) +{ + Tcl_DriverThreadActionProc *threadActionProc = + Tcl_ChannelThreadActionProc(chanPtr->typePtr); + + if (threadActionProc != NULL) { + threadActionProc(chanPtr->instanceData, action); + } +} + +static inline void +ChanWatch( + Channel *chanPtr, + int mask) +{ + chanPtr->typePtr->watchProc(chanPtr->instanceData, mask); +} +static inline int +ChanWrite( + Channel *chanPtr, + const char *src, + int srcLen, + int *errnoPtr) +{ + return chanPtr->typePtr->outputProc(chanPtr->instanceData, src, srcLen, + errnoPtr); +} /* *--------------------------------------------------------------------------- @@ -477,7 +463,7 @@ static int WriteChars _ANSI_ARGS_((Channel *chanPtr, * TclInitIOSubsystem -- * * Initialize all resources used by this subsystem on a per-process - * basis. + * basis. * * Results: * None. @@ -489,23 +475,24 @@ static int WriteChars _ANSI_ARGS_((Channel *chanPtr, */ void -TclInitIOSubsystem() +TclInitIOSubsystem(void) { /* - * By fetching thread local storage we take care of - * allocating it for each thread. + * By fetching thread local storage we take care of allocating it for each + * thread. */ + (void) TCL_TSD_INIT(&dataKey); -} +} /* *------------------------------------------------------------------------- * * TclFinalizeIOSubsystem -- * - * Releases all resources used by this subsystem on a per-process - * basis. Closes all extant channels that have not already been - * closed because they were not owned by any interp. + * Releases all resources used by this subsystem on a per-process basis. + * Closes all extant channels that have not already been closed because + * they were not owned by any interp. * * Results: * None. @@ -518,89 +505,132 @@ TclInitIOSubsystem() /* ARGSUSED */ void -TclFinalizeIOSubsystem() +TclFinalizeIOSubsystem(void) { ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - Channel *chanPtr; /* Iterates over open channels. */ - Channel *nextChanPtr; /* Iterates over open channels. */ + Channel *chanPtr = NULL; /* Iterates over open channels. */ + ChannelState *statePtr; /* State of channel stack */ + int active = 1; /* Flag == 1 while there's still work to do */ + int doflushnb; + + /* Fetch the pre-TIP#398 compatibility flag */ + { + const char *s; + Tcl_DString ds; + + s = TclGetEnv("TCL_FLUSH_NONBLOCKING_ON_EXIT", &ds); + doflushnb = ((s != NULL) && strcmp(s, "0")); + if (s != NULL) { + Tcl_DStringFree(&ds); + } + } + /* + * Walk all channel state structures known to this thread and close + * corresponding channels. + */ - for (chanPtr = tsdPtr->firstChanPtr; chanPtr != (Channel *) NULL; - chanPtr = nextChanPtr) { - nextChanPtr = chanPtr->nextChanPtr; + while (active) { + /* + * Iterate through the open channel list, and find the first channel + * that isn't dead. We start from the head of the list each time, + * because the close action on one channel can close others. + */ - /* - * Set the channel back into blocking mode to ensure that we wait - * for all data to flush out. - */ - - (void) Tcl_SetChannelOption(NULL, (Tcl_Channel) chanPtr, - "-blocking", "on"); + active = 0; + for (statePtr = tsdPtr->firstCSPtr; + statePtr != NULL; + statePtr = statePtr->nextCSPtr) { + chanPtr = statePtr->topChanPtr; + if (GotFlag(statePtr, CHANNEL_DEAD)) { + continue; + } + if (!GotFlag(statePtr, CHANNEL_INCLOSE | CHANNEL_CLOSED ) + || GotFlag(statePtr, BG_FLUSH_SCHEDULED)) { + ResetFlag(statePtr, BG_FLUSH_SCHEDULED); + active = 1; + break; + } + } - if ((chanPtr == (Channel *) tsdPtr->stdinChannel) || - (chanPtr == (Channel *) tsdPtr->stdoutChannel) || - (chanPtr == (Channel *) tsdPtr->stderrChannel)) { + /* + * We've found a live (or bg-closing) channel. Close it. + */ - /* - * Decrement the refcount which was earlier artificially bumped - * up to keep the channel from being closed. - */ + if (active) { - chanPtr->refCount--; - } + /* + * TIP #398: by default, we no longer set the channel back into + * blocking mode. To restore the old blocking behavior, the + * environment variable TCL_FLUSH_NONBLOCKING_ON_EXIT must be set + * and not be "0". + */ + if (doflushnb) { + /* Set the channel back into blocking mode to ensure that we wait + * for all data to flush out. + */ + + (void) Tcl_SetChannelOption(NULL, (Tcl_Channel) chanPtr, + "-blocking", "on"); + } - if (chanPtr->refCount <= 0) { + if ((chanPtr == (Channel *) tsdPtr->stdinChannel) || + (chanPtr == (Channel *) tsdPtr->stdoutChannel) || + (chanPtr == (Channel *) tsdPtr->stderrChannel)) { + /* + * Decrement the refcount which was earlier artificially + * bumped up to keep the channel from being closed. + */ - /* - * Close it only if the refcount indicates that the channel is not - * referenced from any interpreter. If it is, that interpreter will - * close the channel when it gets destroyed. - */ + statePtr->refCount--; + } - (void) Tcl_Close((Tcl_Interp *) NULL, (Tcl_Channel) chanPtr); + if (statePtr->refCount <= 0) { + /* + * Close it only if the refcount indicates that the channel is + * not referenced from any interpreter. If it is, that + * interpreter will close the channel when it gets destroyed. + */ - } else { + (void) Tcl_Close(NULL, (Tcl_Channel) chanPtr); + } else { + /* + * The refcount is greater than zero, so flush the channel. + */ - /* - * The refcount is greater than zero, so flush the channel. - */ + Tcl_Flush((Tcl_Channel) chanPtr); - Tcl_Flush((Tcl_Channel) chanPtr); + /* + * Call the device driver to actually close the underlying + * device for this channel. + */ - /* - * Call the device driver to actually close the underlying - * device for this channel. - */ - - if (chanPtr->typePtr->closeProc != TCL_CLOSE2PROC) { - (chanPtr->typePtr->closeProc)(chanPtr->instanceData, - (Tcl_Interp *) NULL); - } else { - (chanPtr->typePtr->close2Proc)(chanPtr->instanceData, - (Tcl_Interp *) NULL, 0); - } + (void) ChanClose(chanPtr, NULL); - /* - * Finally, we clean up the fields in the channel data structure - * since all of them have been deleted already. We mark the - * channel with CHANNEL_DEAD to prevent any further IO operations - * on it. - */ + /* + * Finally, we clean up the fields in the channel data + * structure since all of them have been deleted already. We + * mark the channel with CHANNEL_DEAD to prevent any further + * IO operations on it. + */ - chanPtr->instanceData = (ClientData) NULL; - chanPtr->flags |= CHANNEL_DEAD; - } + chanPtr->instanceData = NULL; + SetFlag(statePtr, CHANNEL_DEAD); + } + } } -} + TclpFinalizeSockets(); + TclpFinalizePipes(); +} /* *---------------------------------------------------------------------- * * Tcl_SetStdChannel -- * - * This function is used to change the channels that are used - * for stdin/stdout/stderr in new interpreters. + * This function is used to change the channels that are used for + * stdin/stdout/stderr in new interpreters. * * Results: * None @@ -612,24 +642,25 @@ TclFinalizeIOSubsystem() */ void -Tcl_SetStdChannel(channel, type) - Tcl_Channel channel; - int type; /* One of TCL_STDIN, TCL_STDOUT, TCL_STDERR. */ +Tcl_SetStdChannel( + Tcl_Channel channel, + int type) /* One of TCL_STDIN, TCL_STDOUT, TCL_STDERR. */ { ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + switch (type) { - case TCL_STDIN: - tsdPtr->stdinInitialized = 1; - tsdPtr->stdinChannel = channel; - break; - case TCL_STDOUT: - tsdPtr->stdoutInitialized = 1; - tsdPtr->stdoutChannel = channel; - break; - case TCL_STDERR: - tsdPtr->stderrInitialized = 1; - tsdPtr->stderrChannel = channel; - break; + case TCL_STDIN: + tsdPtr->stdinInitialized = 1; + tsdPtr->stdinChannel = channel; + break; + case TCL_STDOUT: + tsdPtr->stdoutInitialized = 1; + tsdPtr->stdoutChannel = channel; + break; + case TCL_STDERR: + tsdPtr->stderrInitialized = 1; + tsdPtr->stderrChannel = channel; + break; } } @@ -644,71 +675,67 @@ Tcl_SetStdChannel(channel, type) * Returns the specified standard channel, or NULL. * * Side effects: - * May cause the creation of a standard channel and the underlying - * file. + * May cause the creation of a standard channel and the underlying file. * *---------------------------------------------------------------------- */ + Tcl_Channel -Tcl_GetStdChannel(type) - int type; /* One of TCL_STDIN, TCL_STDOUT, TCL_STDERR. */ +Tcl_GetStdChannel( + int type) /* One of TCL_STDIN, TCL_STDOUT, TCL_STDERR. */ { Tcl_Channel channel = NULL; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); /* - * If the channels were not created yet, create them now and - * store them in the static variables. + * If the channels were not created yet, create them now and store them in + * the static variables. */ switch (type) { - case TCL_STDIN: - if (!tsdPtr->stdinInitialized) { - tsdPtr->stdinChannel = TclpGetDefaultStdChannel(TCL_STDIN); - tsdPtr->stdinInitialized = 1; + case TCL_STDIN: + if (!tsdPtr->stdinInitialized) { + tsdPtr->stdinChannel = TclpGetDefaultStdChannel(TCL_STDIN); + tsdPtr->stdinInitialized = 1; - /* - * Artificially bump the refcount to ensure that the channel - * is only closed on exit. - * - * NOTE: Must only do this if stdinChannel is not NULL. It - * can be NULL in situations where Tcl is unable to connect - * to the standard input. - */ - - if (tsdPtr->stdinChannel != (Tcl_Channel) NULL) { - (void) Tcl_RegisterChannel((Tcl_Interp *) NULL, - tsdPtr->stdinChannel); - } + /* + * Artificially bump the refcount to ensure that the channel is + * only closed on exit. + * + * NOTE: Must only do this if stdinChannel is not NULL. It can be + * NULL in situations where Tcl is unable to connect to the + * standard input. + */ + + if (tsdPtr->stdinChannel != NULL) { + Tcl_RegisterChannel(NULL, tsdPtr->stdinChannel); } - channel = tsdPtr->stdinChannel; - break; - case TCL_STDOUT: - if (!tsdPtr->stdoutInitialized) { - tsdPtr->stdoutChannel = TclpGetDefaultStdChannel(TCL_STDOUT); - tsdPtr->stdoutInitialized = 1; - if (tsdPtr->stdoutChannel != (Tcl_Channel) NULL) { - (void) Tcl_RegisterChannel((Tcl_Interp *) NULL, - tsdPtr->stdoutChannel); - } + } + channel = tsdPtr->stdinChannel; + break; + case TCL_STDOUT: + if (!tsdPtr->stdoutInitialized) { + tsdPtr->stdoutChannel = TclpGetDefaultStdChannel(TCL_STDOUT); + tsdPtr->stdoutInitialized = 1; + if (tsdPtr->stdoutChannel != NULL) { + Tcl_RegisterChannel(NULL, tsdPtr->stdoutChannel); } - channel = tsdPtr->stdoutChannel; - break; - case TCL_STDERR: - if (!tsdPtr->stderrInitialized) { - tsdPtr->stderrChannel = TclpGetDefaultStdChannel(TCL_STDERR); - tsdPtr->stderrInitialized = 1; - if (tsdPtr->stderrChannel != (Tcl_Channel) NULL) { - (void) Tcl_RegisterChannel((Tcl_Interp *) NULL, - tsdPtr->stderrChannel); - } + } + channel = tsdPtr->stdoutChannel; + break; + case TCL_STDERR: + if (!tsdPtr->stderrInitialized) { + tsdPtr->stderrChannel = TclpGetDefaultStdChannel(TCL_STDERR); + tsdPtr->stderrInitialized = 1; + if (tsdPtr->stderrChannel != NULL) { + Tcl_RegisterChannel(NULL, tsdPtr->stderrChannel); } - channel = tsdPtr->stderrChannel; - break; + } + channel = tsdPtr->stderrChannel; + break; } return channel; } - /* *---------------------------------------------------------------------- @@ -722,32 +749,30 @@ Tcl_GetStdChannel(type) * None. * * Side effects: - * Causes the callback to be called in the future when the channel - * will be closed. + * Causes the callback to be called in the future when the channel will + * be closed. * *---------------------------------------------------------------------- */ void -Tcl_CreateCloseHandler(chan, proc, clientData) - Tcl_Channel chan; /* The channel for which to create the - * close callback. */ - Tcl_CloseProc *proc; /* The callback routine to call when the - * channel will be closed. */ - ClientData clientData; /* Arbitrary data to pass to the - * close callback. */ +Tcl_CreateCloseHandler( + Tcl_Channel chan, /* The channel for which to create the close + * callback. */ + Tcl_CloseProc *proc, /* The callback routine to call when the + * channel will be closed. */ + ClientData clientData) /* Arbitrary data to pass to the close + * callback. */ { - Channel *chanPtr; + ChannelState *statePtr = ((Channel *) chan)->state; CloseCallback *cbPtr; - chanPtr = (Channel *) chan; - - cbPtr = (CloseCallback *) ckalloc((unsigned) sizeof(CloseCallback)); + cbPtr = ckalloc(sizeof(CloseCallback)); cbPtr->proc = proc; cbPtr->clientData = clientData; - cbPtr->nextPtr = chanPtr->closeCbPtr; - chanPtr->closeCbPtr = cbPtr; + cbPtr->nextPtr = statePtr->closeCbPtr; + statePtr->closeCbPtr = cbPtr; } /* @@ -755,45 +780,43 @@ Tcl_CreateCloseHandler(chan, proc, clientData) * * Tcl_DeleteCloseHandler -- * - * Removes a callback that would have been called on closing - * the channel. If there is no matching callback then this - * function has no effect. + * Removes a callback that would have been called on closing the channel. + * If there is no matching callback then this function has no effect. * * Results: * None. * * Side effects: - * The callback will not be called in the future when the channel - * is eventually closed. + * The callback will not be called in the future when the channel is + * eventually closed. * *---------------------------------------------------------------------- */ void -Tcl_DeleteCloseHandler(chan, proc, clientData) - Tcl_Channel chan; /* The channel for which to cancel the - * close callback. */ - Tcl_CloseProc *proc; /* The procedure for the callback to - * remove. */ - ClientData clientData; /* The callback data for the callback - * to remove. */ +Tcl_DeleteCloseHandler( + Tcl_Channel chan, /* The channel for which to cancel the close + * callback. */ + Tcl_CloseProc *proc, /* The procedure for the callback to + * remove. */ + ClientData clientData) /* The callback data for the callback to + * remove. */ { - Channel *chanPtr; + ChannelState *statePtr = ((Channel *) chan)->state; CloseCallback *cbPtr, *cbPrevPtr; - chanPtr = (Channel *) chan; - for (cbPtr = chanPtr->closeCbPtr, cbPrevPtr = (CloseCallback *) NULL; - cbPtr != (CloseCallback *) NULL; - cbPtr = cbPtr->nextPtr) { - if ((cbPtr->proc == proc) && (cbPtr->clientData == clientData)) { - if (cbPrevPtr == (CloseCallback *) NULL) { - chanPtr->closeCbPtr = cbPtr->nextPtr; - } - ckfree((char *) cbPtr); - break; - } else { - cbPrevPtr = cbPtr; - } + for (cbPtr = statePtr->closeCbPtr, cbPrevPtr = NULL; + cbPtr != NULL; cbPtr = cbPtr->nextPtr) { + if ((cbPtr->proc == proc) && (cbPtr->clientData == clientData)) { + if (cbPrevPtr == NULL) { + statePtr->closeCbPtr = cbPtr->nextPtr; + } else { + cbPrevPtr->nextPtr = cbPtr->nextPtr; + } + ckfree(cbPtr); + break; + } + cbPrevPtr = cbPtr; } } @@ -802,58 +825,53 @@ Tcl_DeleteCloseHandler(chan, proc, clientData) * * GetChannelTable -- * - * Gets and potentially initializes the channel table for an - * interpreter. If it is initializing the table it also inserts - * channels for stdin, stdout and stderr if the interpreter is - * trusted. + * Gets and potentially initializes the channel table for an interpreter. + * If it is initializing the table it also inserts channels for stdin, + * stdout and stderr if the interpreter is trusted. * * Results: * A pointer to the hash table created, for use by the caller. * * Side effects: - * Initializes the channel table for an interpreter. May create - * channels for stdin, stdout and stderr. + * Initializes the channel table for an interpreter. May create channels + * for stdin, stdout and stderr. * *---------------------------------------------------------------------- */ static Tcl_HashTable * -GetChannelTable(interp) - Tcl_Interp *interp; +GetChannelTable( + Tcl_Interp *interp) { Tcl_HashTable *hTblPtr; /* Hash table of channels. */ Tcl_Channel stdinChan, stdoutChan, stderrChan; - hTblPtr = (Tcl_HashTable *) Tcl_GetAssocData(interp, "tclIO", NULL); - if (hTblPtr == (Tcl_HashTable *) NULL) { - hTblPtr = (Tcl_HashTable *) ckalloc((unsigned) sizeof(Tcl_HashTable)); - Tcl_InitHashTable(hTblPtr, TCL_STRING_KEYS); - - (void) Tcl_SetAssocData(interp, "tclIO", - (Tcl_InterpDeleteProc *) DeleteChannelTable, - (ClientData) hTblPtr); + hTblPtr = Tcl_GetAssocData(interp, "tclIO", NULL); + if (hTblPtr == NULL) { + hTblPtr = ckalloc(sizeof(Tcl_HashTable)); + Tcl_InitHashTable(hTblPtr, TCL_STRING_KEYS); + Tcl_SetAssocData(interp, "tclIO", + (Tcl_InterpDeleteProc *) DeleteChannelTable, hTblPtr); - /* - * If the interpreter is trusted (not "safe"), insert channels - * for stdin, stdout and stderr (possibly creating them in the - * process). - */ - - if (Tcl_IsSafe(interp) == 0) { - stdinChan = Tcl_GetStdChannel(TCL_STDIN); - if (stdinChan != NULL) { - Tcl_RegisterChannel(interp, stdinChan); - } - stdoutChan = Tcl_GetStdChannel(TCL_STDOUT); - if (stdoutChan != NULL) { - Tcl_RegisterChannel(interp, stdoutChan); - } - stderrChan = Tcl_GetStdChannel(TCL_STDERR); - if (stderrChan != NULL) { - Tcl_RegisterChannel(interp, stderrChan); - } - } + /* + * If the interpreter is trusted (not "safe"), insert channels for + * stdin, stdout and stderr (possibly creating them in the process). + */ + if (Tcl_IsSafe(interp) == 0) { + stdinChan = Tcl_GetStdChannel(TCL_STDIN); + if (stdinChan != NULL) { + Tcl_RegisterChannel(interp, stdinChan); + } + stdoutChan = Tcl_GetStdChannel(TCL_STDOUT); + if (stdoutChan != NULL) { + Tcl_RegisterChannel(interp, stdoutChan); + } + stderrChan = Tcl_GetStdChannel(TCL_STDERR); + if (stderrChan != NULL) { + Tcl_RegisterChannel(interp, stderrChan); + } + } } return hTblPtr; } @@ -864,9 +882,8 @@ GetChannelTable(interp) * DeleteChannelTable -- * * Deletes the channel table for an interpreter, closing any open - * channels whose refcount reaches zero. This procedure is invoked - * when an interpreter is deleted, via the AssocData cleanup - * mechanism. + * channels whose refcount reaches zero. This procedure is invoked when + * an interpreter is deleted, via the AssocData cleanup mechanism. * * Results: * None. @@ -880,74 +897,74 @@ GetChannelTable(interp) */ static void -DeleteChannelTable(clientData, interp) - ClientData clientData; /* The per-interpreter data structure. */ - Tcl_Interp *interp; /* The interpreter being deleted. */ +DeleteChannelTable( + ClientData clientData, /* The per-interpreter data structure. */ + Tcl_Interp *interp) /* The interpreter being deleted. */ { Tcl_HashTable *hTblPtr; /* The hash table. */ Tcl_HashSearch hSearch; /* Search variable. */ Tcl_HashEntry *hPtr; /* Search variable. */ - Channel *chanPtr; /* Channel being deleted. */ + Channel *chanPtr; /* Channel being deleted. */ + ChannelState *statePtr; /* State of Channel being deleted. */ EventScriptRecord *sPtr, *prevPtr, *nextPtr; - /* Variables to loop over all channel events - * registered, to delete the ones that refer - * to the interpreter being deleted. */ - + /* Variables to loop over all channel events + * registered, to delete the ones that refer + * to the interpreter being deleted. */ + /* * Delete all the registered channels - this will close channels whose * refcount reaches zero. */ - - hTblPtr = (Tcl_HashTable *) clientData; - for (hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch); - hPtr != (Tcl_HashEntry *) NULL; - hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch)) { - chanPtr = (Channel *) Tcl_GetHashValue(hPtr); + hTblPtr = clientData; + for (hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch); hPtr != NULL; + hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch)) { + chanPtr = Tcl_GetHashValue(hPtr); + statePtr = chanPtr->state; - /* - * Remove any fileevents registered in this interpreter. - */ - - for (sPtr = chanPtr->scriptRecordPtr, - prevPtr = (EventScriptRecord *) NULL; - sPtr != (EventScriptRecord *) NULL; - sPtr = nextPtr) { - nextPtr = sPtr->nextPtr; - if (sPtr->interp == interp) { - if (prevPtr == (EventScriptRecord *) NULL) { - chanPtr->scriptRecordPtr = nextPtr; - } else { - prevPtr->nextPtr = nextPtr; - } - - Tcl_DeleteChannelHandler((Tcl_Channel) chanPtr, - ChannelEventScriptInvoker, (ClientData) sPtr); - - Tcl_DecrRefCount(sPtr->scriptPtr); - ckfree((char *) sPtr); - } else { - prevPtr = sPtr; - } - } + /* + * Remove any fileevents registered in this interpreter. + */ - /* - * Cannot call Tcl_UnregisterChannel because that procedure calls - * Tcl_GetAssocData to get the channel table, which might already - * be inaccessible from the interpreter structure. Instead, we - * emulate the behavior of Tcl_UnregisterChannel directly here. - */ + for (sPtr = statePtr->scriptRecordPtr, prevPtr = NULL; + sPtr != NULL; sPtr = nextPtr) { + nextPtr = sPtr->nextPtr; + if (sPtr->interp == interp) { + if (prevPtr == NULL) { + statePtr->scriptRecordPtr = nextPtr; + } else { + prevPtr->nextPtr = nextPtr; + } + + Tcl_DeleteChannelHandler((Tcl_Channel) chanPtr, + TclChannelEventScriptInvoker, sPtr); + + TclDecrRefCount(sPtr->scriptPtr); + ckfree(sPtr); + } else { + prevPtr = sPtr; + } + } + + /* + * Cannot call Tcl_UnregisterChannel because that procedure calls + * Tcl_GetAssocData to get the channel table, which might already be + * inaccessible from the interpreter structure. Instead, we emulate + * the behavior of Tcl_UnregisterChannel directly here. + */ + + Tcl_DeleteHashEntry(hPtr); + SetFlag(statePtr, CHANNEL_TAINTED); + statePtr->refCount--; + if (statePtr->refCount <= 0) { + if (!GotFlag(statePtr, BG_FLUSH_SCHEDULED)) { + (void) Tcl_Close(interp, (Tcl_Channel) chanPtr); + } + } - Tcl_DeleteHashEntry(hPtr); - chanPtr->refCount--; - if (chanPtr->refCount <= 0) { - if (!(chanPtr->flags & BG_FLUSH_SCHEDULED)) { - (void) Tcl_Close(interp, (Tcl_Channel) chanPtr); - } - } } Tcl_DeleteHashTable(hTblPtr); - ckfree((char *) hTblPtr); + ckfree(hTblPtr); } /* @@ -956,11 +973,11 @@ DeleteChannelTable(clientData, interp) * CheckForStdChannelsBeingClosed -- * * Perform special handling for standard channels being closed. When - * given a standard channel, if the refcount is now 1, it means that - * the last reference to the standard channel is being explicitly - * closed. Now bump the refcount artificially down to 0, to ensure the - * normal handling of channels being closed will occur. Also reset the - * static pointer to the channel to NULL, to avoid dangling references. + * given a standard channel, if the refcount is now 1, it means that the + * last reference to the standard channel is being explicitly closed. Now + * bump the refcount artificially down to 0, to ensure the normal + * handling of channels being closed will occur. Also reset the static + * pointer to the channel to NULL, to avoid dangling references. * * Results: * None. @@ -973,30 +990,69 @@ DeleteChannelTable(clientData, interp) */ static void -CheckForStdChannelsBeingClosed(chan) - Tcl_Channel chan; +CheckForStdChannelsBeingClosed( + Tcl_Channel chan) { - Channel *chanPtr = (Channel *) chan; + ChannelState *statePtr = ((Channel *) chan)->state; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - if ((chan == tsdPtr->stdinChannel) && (tsdPtr->stdinInitialized)) { - if (chanPtr->refCount < 2) { - chanPtr->refCount = 0; - tsdPtr->stdinChannel = NULL; - return; - } - } else if ((chan == tsdPtr->stdoutChannel) && (tsdPtr->stdoutInitialized)) { - if (chanPtr->refCount < 2) { - chanPtr->refCount = 0; - tsdPtr->stdoutChannel = NULL; - return; - } - } else if ((chan == tsdPtr->stderrChannel) && (tsdPtr->stderrInitialized)) { - if (chanPtr->refCount < 2) { - chanPtr->refCount = 0; - tsdPtr->stderrChannel = NULL; - return; - } + if (tsdPtr->stdinInitialized + && tsdPtr->stdinChannel != NULL + && statePtr == ((Channel *)tsdPtr->stdinChannel)->state) { + if (statePtr->refCount < 2) { + statePtr->refCount = 0; + tsdPtr->stdinChannel = NULL; + return; + } + } else if (tsdPtr->stdoutInitialized + && tsdPtr->stdoutChannel != NULL + && statePtr == ((Channel *)tsdPtr->stdoutChannel)->state) { + if (statePtr->refCount < 2) { + statePtr->refCount = 0; + tsdPtr->stdoutChannel = NULL; + return; + } + } else if (tsdPtr->stderrInitialized + && tsdPtr->stderrChannel != NULL + && statePtr == ((Channel *)tsdPtr->stderrChannel)->state) { + if (statePtr->refCount < 2) { + statePtr->refCount = 0; + tsdPtr->stderrChannel = NULL; + return; + } + } +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_IsStandardChannel -- + * + * Test if the given channel is a standard channel. No attempt is made to + * check if the channel or the standard channels are initialized or + * otherwise valid. + * + * Results: + * Returns 1 if true, 0 if false. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_IsStandardChannel( + Tcl_Channel chan) /* Channel to check. */ +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + + if ((chan == tsdPtr->stdinChannel) + || (chan == tsdPtr->stdoutChannel) + || (chan == tsdPtr->stderrChannel)) { + return 1; + } else { + return 0; } } @@ -1006,8 +1062,8 @@ CheckForStdChannelsBeingClosed(chan) * Tcl_RegisterChannel -- * * Adds an already-open channel to the channel table of an interpreter. - * If the interpreter passed as argument is NULL, it only increments - * the channel refCount. + * If the interpreter passed as argument is NULL, it only increments the + * channel refCount. * * Results: * None. @@ -1019,47 +1075,42 @@ CheckForStdChannelsBeingClosed(chan) */ void -Tcl_RegisterChannel(interp, chan) - Tcl_Interp *interp; /* Interpreter in which to add the channel. */ - Tcl_Channel chan; /* The channel to add to this interpreter - * channel table. */ +Tcl_RegisterChannel( + Tcl_Interp *interp, /* Interpreter in which to add the channel. */ + Tcl_Channel chan) /* The channel to add to this interpreter + * channel table. */ { Tcl_HashTable *hTblPtr; /* Hash table of channels. */ Tcl_HashEntry *hPtr; /* Search variable. */ - int new; /* Is the hash entry new or does it exist? */ + int isNew; /* Is the hash entry new or does it exist? */ Channel *chanPtr; /* The actual channel. */ + ChannelState *statePtr; /* State of the actual channel. */ - chanPtr = (Channel *) chan; + /* + * Always (un)register bottom-most channel in the stack. This makes + * management of the channel list easier because no manipulation is + * necessary during (un)stack operation. + */ - if (chanPtr->channelName == (char *) NULL) { - panic("Tcl_RegisterChannel: channel without name"); - } - if (interp != (Tcl_Interp *) NULL) { - hTblPtr = GetChannelTable(interp); - hPtr = Tcl_CreateHashEntry(hTblPtr, chanPtr->channelName, &new); - if (new == 0) { - if (chan == (Tcl_Channel) Tcl_GetHashValue(hPtr)) { - return; - } + chanPtr = ((Channel *) chan)->state->bottomChanPtr; + statePtr = chanPtr->state; - /* Andreas Kupries <a.kupries@westend.com>, 12/13/1998 - * "Trf-Patch for filtering channels" - * - * This is the change to 'Tcl_RegisterChannel'. - * - * Explanation: - * The moment a channel is stacked upon another he - * takes the identity of the channel he supercedes, - * i.e. he gets the *same* name. Because of this we - * cannot check for duplicate names anymore, they - * have to be allowed now. - */ + if (statePtr->channelName == NULL) { + Tcl_Panic("Tcl_RegisterChannel: channel without name"); + } + if (interp != NULL) { + hTblPtr = GetChannelTable(interp); + hPtr = Tcl_CreateHashEntry(hTblPtr, statePtr->channelName, &isNew); + if (!isNew) { + if (chan == Tcl_GetHashValue(hPtr)) { + return; + } - /* panic("Tcl_RegisterChannel: duplicate channel names"); */ - } - Tcl_SetHashValue(hPtr, (ClientData) chanPtr); + Tcl_Panic("Tcl_RegisterChannel: duplicate channel names"); + } + Tcl_SetHashValue(hPtr, chanPtr); } - chanPtr->refCount++; + statePtr->refCount++; } /* @@ -1069,55 +1120,49 @@ Tcl_RegisterChannel(interp, chan) * * Deletes the hash entry for a channel associated with an interpreter. * If the interpreter given as argument is NULL, it only decrements the - * reference count. + * reference count. (This all happens in the Tcl_DetachChannel helper + * function). + * + * Finally, if the reference count of the channel drops to zero, it is + * deleted. * * Results: * A standard Tcl result. * * Side effects: - * Deletes the hash entry for a channel associated with an interpreter. + * Calls Tcl_DetachChannel which deletes the hash entry for a channel + * associated with an interpreter. + * + * May delete the channel, which can have a variety of consequences, + * especially if we are forced to close the channel. * *---------------------------------------------------------------------- */ int -Tcl_UnregisterChannel(interp, chan) - Tcl_Interp *interp; /* Interpreter in which channel is defined. */ - Tcl_Channel chan; /* Channel to delete. */ +Tcl_UnregisterChannel( + Tcl_Interp *interp, /* Interpreter in which channel is defined. */ + Tcl_Channel chan) /* Channel to delete. */ { - Tcl_HashTable *hTblPtr; /* Hash table of channels. */ - Tcl_HashEntry *hPtr; /* Search variable. */ - Channel *chanPtr; /* The real IO channel. */ + ChannelState *statePtr; /* State of the real channel. */ - chanPtr = (Channel *) chan; - - if (interp != (Tcl_Interp *) NULL) { - hTblPtr = (Tcl_HashTable *) Tcl_GetAssocData(interp, "tclIO", NULL); - if (hTblPtr == (Tcl_HashTable *) NULL) { - return TCL_OK; - } - hPtr = Tcl_FindHashEntry(hTblPtr, chanPtr->channelName); - if (hPtr == (Tcl_HashEntry *) NULL) { - return TCL_OK; - } - if ((Channel *) Tcl_GetHashValue(hPtr) != chanPtr) { - return TCL_OK; - } - Tcl_DeleteHashEntry(hPtr); - - /* - * Remove channel handlers that refer to this interpreter, so that they - * will not be present if the actual close is delayed and more events - * happen on the channel. This may occur if the channel is shared - * between several interpreters, or if the channel has async - * flushing active. - */ - - CleanupChannelHandlers(interp, chanPtr); + statePtr = ((Channel *) chan)->state->bottomChanPtr->state; + + if (GotFlag(statePtr, CHANNEL_INCLOSE)) { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "illegal recursive call to close through close-handler" + " of channel", -1)); + } + return TCL_ERROR; + } + + if (DetachChannel(interp, chan) != TCL_OK) { + return TCL_OK; } - chanPtr->refCount--; - + statePtr = ((Channel *) chan)->state->bottomChanPtr->state; + /* * Perform special handling for standard channels being closed. If the * refCount is now 1 it means that the last reference to the standard @@ -1132,25 +1177,152 @@ Tcl_UnregisterChannel(interp, chan) * If the refCount reached zero, close the actual channel. */ - if (chanPtr->refCount <= 0) { + if (statePtr->refCount <= 0) { + /* + * Ensure that if there is another buffer, it gets flushed whether or + * not we are doing a background flush. + */ - /* - * Ensure that if there is another buffer, it gets flushed - * whether or not we are doing a background flush. - */ + if ((statePtr->curOutPtr != NULL) && + IsBufferReady(statePtr->curOutPtr)) { + SetFlag(statePtr, BUFFER_READY); + } + Tcl_Preserve(statePtr); + if (!GotFlag(statePtr, BG_FLUSH_SCHEDULED)) { + /* + * We don't want to re-enter Tcl_Close(). + */ - if ((chanPtr->curOutPtr != NULL) && - (chanPtr->curOutPtr->nextAdded > - chanPtr->curOutPtr->nextRemoved)) { - chanPtr->flags |= BUFFER_READY; - } - chanPtr->flags |= CHANNEL_CLOSED; - if (!(chanPtr->flags & BG_FLUSH_SCHEDULED)) { - if (Tcl_Close(interp, chan) != TCL_OK) { - return TCL_ERROR; - } - } + if (!GotFlag(statePtr, CHANNEL_CLOSED)) { + if (Tcl_Close(interp, chan) != TCL_OK) { + SetFlag(statePtr, CHANNEL_CLOSED); + Tcl_Release(statePtr); + return TCL_ERROR; + } + } + } + SetFlag(statePtr, CHANNEL_CLOSED); + Tcl_Release(statePtr); + } + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_DetachChannel -- + * + * Deletes the hash entry for a channel associated with an interpreter. + * If the interpreter given as argument is NULL, it only decrements the + * reference count. Even if the ref count drops to zero, the channel is + * NOT closed or cleaned up. This allows a channel to be detached from an + * interpreter and left in the same state it was in when it was + * originally returned by 'Tcl_OpenFileChannel', for example. + * + * This function cannot be used on the standard channels, and will return + * TCL_ERROR if that is attempted. + * + * This function should only be necessary for special purposes in which + * you need to generate a pristine channel from one that has already been + * used. All ordinary purposes will almost always want to use + * Tcl_UnregisterChannel instead. + * + * Provided the channel is not attached to any other interpreter, it can + * then be closed with Tcl_Close, rather than with Tcl_UnregisterChannel. + * + * Results: + * A standard Tcl result. If the channel is not currently registered with + * the given interpreter, TCL_ERROR is returned, otherwise TCL_OK. + * However no error messages are left in the interp's result. + * + * Side effects: + * Deletes the hash entry for a channel associated with an interpreter. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_DetachChannel( + Tcl_Interp *interp, /* Interpreter in which channel is defined. */ + Tcl_Channel chan) /* Channel to delete. */ +{ + if (Tcl_IsStandardChannel(chan)) { + return TCL_ERROR; + } + + return DetachChannel(interp, chan); +} + +/* + *---------------------------------------------------------------------- + * + * DetachChannel -- + * + * Deletes the hash entry for a channel associated with an interpreter. + * If the interpreter given as argument is NULL, it only decrements the + * reference count. Even if the ref count drops to zero, the channel is + * NOT closed or cleaned up. This allows a channel to be detached from an + * interpreter and left in the same state it was in when it was + * originally returned by 'Tcl_OpenFileChannel', for example. + * + * Results: + * A standard Tcl result. If the channel is not currently registered with + * the given interpreter, TCL_ERROR is returned, otherwise TCL_OK. + * However no error messages are left in the interp's result. + * + * Side effects: + * Deletes the hash entry for a channel associated with an interpreter. + * + *---------------------------------------------------------------------- + */ + +static int +DetachChannel( + Tcl_Interp *interp, /* Interpreter in which channel is defined. */ + Tcl_Channel chan) /* Channel to delete. */ +{ + Tcl_HashTable *hTblPtr; /* Hash table of channels. */ + Tcl_HashEntry *hPtr; /* Search variable. */ + Channel *chanPtr; /* The real IO channel. */ + ChannelState *statePtr; /* State of the real channel. */ + + /* + * Always (un)register bottom-most channel in the stack. This makes + * management of the channel list easier because no manipulation is + * necessary during (un)stack operation. + */ + + chanPtr = ((Channel *) chan)->state->bottomChanPtr; + statePtr = chanPtr->state; + + if (interp != NULL) { + hTblPtr = Tcl_GetAssocData(interp, "tclIO", NULL); + if (hTblPtr == NULL) { + return TCL_ERROR; + } + hPtr = Tcl_FindHashEntry(hTblPtr, statePtr->channelName); + if (hPtr == NULL) { + return TCL_ERROR; + } + if ((Channel *) Tcl_GetHashValue(hPtr) != chanPtr) { + return TCL_ERROR; + } + Tcl_DeleteHashEntry(hPtr); + SetFlag(statePtr, CHANNEL_TAINTED); + + /* + * Remove channel handlers that refer to this interpreter, so that + * they will not be present if the actual close is delayed and more + * events happen on the channel. This may occur if the channel is + * shared between several interpreters, or if the channel has async + * flushing active. + */ + + CleanupChannelHandlers(interp, chanPtr); } + + statePtr->refCount--; + return TCL_OK; } @@ -1164,9 +1336,9 @@ Tcl_UnregisterChannel(interp, chan) * channel-type-specific functions. * * Results: - * A Tcl_Channel or NULL on failure. If failed, interp's result - * object contains an error message. *modePtr is filled with the - * modes in which the channel was opened. + * A Tcl_Channel or NULL on failure. If failed, interp's result object + * contains an error message. *modePtr is filled with the modes in which + * the channel was opened. * * Side effects: * None. @@ -1175,176 +1347,301 @@ Tcl_UnregisterChannel(interp, chan) */ Tcl_Channel -Tcl_GetChannel(interp, chanName, modePtr) - Tcl_Interp *interp; /* Interpreter in which to find or create - * the channel. */ - char *chanName; /* The name of the channel. */ - int *modePtr; /* Where to store the mode in which the - * channel was opened? Will contain an ORed - * combination of TCL_READABLE and - * TCL_WRITABLE, if non-NULL. */ +Tcl_GetChannel( + Tcl_Interp *interp, /* Interpreter in which to find or create the + * channel. */ + const char *chanName, /* The name of the channel. */ + int *modePtr) /* Where to store the mode in which the + * channel was opened? Will contain an ORed + * combination of TCL_READABLE and + * TCL_WRITABLE, if non-NULL. */ { Channel *chanPtr; /* The actual channel. */ Tcl_HashTable *hTblPtr; /* Hash table of channels. */ Tcl_HashEntry *hPtr; /* Search variable. */ - char *name; /* Translated name. */ + const char *name; /* Translated name. */ /* - * Substitute "stdin", etc. Note that even though we immediately - * find the channel using Tcl_GetStdChannel, we still need to look - * it up in the specified interpreter to ensure that it is present - * in the channel table. Otherwise, safe interpreters would always - * have access to the standard channels. + * Substitute "stdin", etc. Note that even though we immediately find the + * channel using Tcl_GetStdChannel, we still need to look it up in the + * specified interpreter to ensure that it is present in the channel + * table. Otherwise, safe interpreters would always have access to the + * standard channels. */ name = chanName; if ((chanName[0] == 's') && (chanName[1] == 't')) { chanPtr = NULL; if (strcmp(chanName, "stdin") == 0) { - chanPtr = (Channel *)Tcl_GetStdChannel(TCL_STDIN); + chanPtr = (Channel *) Tcl_GetStdChannel(TCL_STDIN); } else if (strcmp(chanName, "stdout") == 0) { - chanPtr = (Channel *)Tcl_GetStdChannel(TCL_STDOUT); + chanPtr = (Channel *) Tcl_GetStdChannel(TCL_STDOUT); } else if (strcmp(chanName, "stderr") == 0) { - chanPtr = (Channel *)Tcl_GetStdChannel(TCL_STDERR); + chanPtr = (Channel *) Tcl_GetStdChannel(TCL_STDERR); } if (chanPtr != NULL) { - name = chanPtr->channelName; + name = chanPtr->state->channelName; } } - + hTblPtr = GetChannelTable(interp); hPtr = Tcl_FindHashEntry(hTblPtr, name); - if (hPtr == (Tcl_HashEntry *) NULL) { - Tcl_AppendResult(interp, "can not find channel named \"", - chanName, "\"", (char *) NULL); - return NULL; + if (hPtr == NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "can not find channel named \"%s\"", chanName)); + Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CHANNEL", chanName, NULL); + return NULL; } - chanPtr = (Channel *) Tcl_GetHashValue(hPtr); + /* + * Always return bottom-most channel in the stack. This one lives the + * longest - other channels may go away unnoticed. The other APIs + * compensate where necessary to retrieve the topmost channel again. + */ + + chanPtr = Tcl_GetHashValue(hPtr); + chanPtr = chanPtr->state->bottomChanPtr; if (modePtr != NULL) { - *modePtr = (chanPtr->flags & (TCL_READABLE|TCL_WRITABLE)); + *modePtr = chanPtr->state->flags & (TCL_READABLE|TCL_WRITABLE); } - + return (Tcl_Channel) chanPtr; } /* + *--------------------------------------------------------------------------- + * + * TclGetChannelFromObj -- + * + * Finds an existing Tcl_Channel structure by name in a given + * interpreter. This function is public because it is used by + * channel-type-specific functions. + * + * Results: + * A Tcl_Channel or NULL on failure. If failed, interp's result object + * contains an error message. *modePtr is filled with the modes in which + * the channel was opened. + * + * Side effects: + * None. + * + *--------------------------------------------------------------------------- + */ + +int +TclGetChannelFromObj( + Tcl_Interp *interp, /* Interpreter in which to find or create the + * channel. */ + Tcl_Obj *objPtr, + Tcl_Channel *channelPtr, + int *modePtr, /* Where to store the mode in which the + * channel was opened? Will contain an ORed + * combination of TCL_READABLE and + * TCL_WRITABLE, if non-NULL. */ + int flags) +{ + ChannelState *statePtr; + + if (SetChannelFromAny(interp, objPtr) != TCL_OK) { + return TCL_ERROR; + } + + statePtr = GET_CHANNELSTATE(objPtr); + *channelPtr = (Tcl_Channel) statePtr->bottomChanPtr; + + if (modePtr != NULL) { + *modePtr = statePtr->flags & (TCL_READABLE|TCL_WRITABLE); + } + + return TCL_OK; +} + +/* *---------------------------------------------------------------------- * * Tcl_CreateChannel -- * - * Creates a new entry in the hash table for a Tcl_Channel - * record. + * Creates a new entry in the hash table for a Tcl_Channel record. * * Results: * Returns the new Tcl_Channel. * * Side effects: - * Creates a new Tcl_Channel instance and inserts it into the - * hash table. + * Creates a new Tcl_Channel instance and inserts it into the hash table. * *---------------------------------------------------------------------- */ Tcl_Channel -Tcl_CreateChannel(typePtr, chanName, instanceData, mask) - Tcl_ChannelType *typePtr; /* The channel type record. */ - char *chanName; /* Name of channel to record. */ - ClientData instanceData; /* Instance specific data. */ - int mask; /* TCL_READABLE & TCL_WRITABLE to indicate - * if the channel is readable, writable. */ +Tcl_CreateChannel( + const Tcl_ChannelType *typePtr, /* The channel type record. */ + const char *chanName, /* Name of channel to record. */ + ClientData instanceData, /* Instance specific data. */ + int mask) /* TCL_READABLE & TCL_WRITABLE to indicate if + * the channel is readable, writable. */ { Channel *chanPtr; /* The channel structure newly created. */ - CONST char *name; + ChannelState *statePtr; /* The stack-level independent state info for + * the channel. */ + const char *name; + char *tmp; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - chanPtr = (Channel *) ckalloc((unsigned) sizeof(Channel)); - - if (chanName != (char *) NULL) { - chanPtr->channelName = ckalloc((unsigned) (strlen(chanName) + 1)); - strcpy(chanPtr->channelName, chanName); + /* + * With the change of the Tcl_ChannelType structure to use a version in + * 8.3.2+, we have to make sure that our assumption that the structure + * remains a binary compatible size is true. + * + * If this assertion fails on some system, then it can be removed only if + * the user recompiles code with older channel drivers in the new system + * as well. + */ + + assert(sizeof(Tcl_ChannelTypeVersion) == sizeof(Tcl_DriverBlockModeProc *)); + + /* + * JH: We could subsequently memset these to 0 to avoid the numerous + * assignments to 0/NULL below. + */ + + chanPtr = ckalloc(sizeof(Channel)); + statePtr = ckalloc(sizeof(ChannelState)); + chanPtr->state = statePtr; + + chanPtr->instanceData = instanceData; + chanPtr->typePtr = typePtr; + + /* + * Set all the bits that are part of the stack-independent state + * information for the channel. + */ + + if (chanName != NULL) { + unsigned len = strlen(chanName) + 1; + + /* + * Make sure we allocate at least 7 bytes, so it fits for "stdout" + * later. + */ + + tmp = ckalloc((len < 7) ? 7 : len); + strcpy(tmp, chanName); } else { - panic("Tcl_CreateChannel: NULL channel name"); + tmp = ckalloc(7); + tmp[0] = '\0'; } - - chanPtr->flags = mask; + statePtr->channelName = tmp; + statePtr->flags = mask; /* * Set the channel to system default encoding. + * + * Note the strange bit of protection taking place here. If the system + * encoding name is reported back as "binary", something weird is + * happening. Tcl provides no "binary" encoding, so someone else has + * provided one. We ignore it so as not to interfere with the "magic" + * interpretation that Tcl_Channels give to the "-encoding binary" option. */ - chanPtr->encoding = NULL; + statePtr->encoding = NULL; name = Tcl_GetEncodingName(NULL); if (strcmp(name, "binary") != 0) { - chanPtr->encoding = Tcl_GetEncoding(NULL, name); + statePtr->encoding = Tcl_GetEncoding(NULL, name); } - chanPtr->inputEncodingState = NULL; - chanPtr->inputEncodingFlags = TCL_ENCODING_START; - chanPtr->outputEncodingState = NULL; - chanPtr->outputEncodingFlags = TCL_ENCODING_START; + statePtr->inputEncodingState = NULL; + statePtr->inputEncodingFlags = TCL_ENCODING_START; + statePtr->outputEncodingState = NULL; + statePtr->outputEncodingFlags = TCL_ENCODING_START; /* - * Set the channel up initially in AUTO input translation mode to - * accept "\n", "\r" and "\r\n". Output translation mode is set to - * a platform specific default value. The eofChar is set to 0 for both - * input and output, so that Tcl does not look for an in-file EOF - * indicator (e.g. ^Z) and does not append an EOF indicator to files. + * Set the channel up initially in AUTO input translation mode to accept + * "\n", "\r" and "\r\n". Output translation mode is set to a platform + * specific default value. The eofChar is set to 0 for both input and + * output, so that Tcl does not look for an in-file EOF indicator (e.g. + * ^Z) and does not append an EOF indicator to files. */ - chanPtr->inputTranslation = TCL_TRANSLATE_AUTO; - chanPtr->outputTranslation = TCL_PLATFORM_TRANSLATION; - chanPtr->inEofChar = 0; - chanPtr->outEofChar = 0; + statePtr->inputTranslation = TCL_TRANSLATE_AUTO; + statePtr->outputTranslation = TCL_PLATFORM_TRANSLATION; + statePtr->inEofChar = 0; + statePtr->outEofChar = 0; - chanPtr->unreportedError = 0; - chanPtr->instanceData = instanceData; - chanPtr->typePtr = typePtr; - chanPtr->refCount = 0; - chanPtr->closeCbPtr = (CloseCallback *) NULL; - chanPtr->curOutPtr = (ChannelBuffer *) NULL; - chanPtr->outQueueHead = (ChannelBuffer *) NULL; - chanPtr->outQueueTail = (ChannelBuffer *) NULL; - chanPtr->saveInBufPtr = (ChannelBuffer *) NULL; - chanPtr->inQueueHead = (ChannelBuffer *) NULL; - chanPtr->inQueueTail = (ChannelBuffer *) NULL; - chanPtr->chPtr = (ChannelHandler *) NULL; - chanPtr->interestMask = 0; - chanPtr->scriptRecordPtr = (EventScriptRecord *) NULL; - chanPtr->bufSize = CHANNELBUFFER_DEFAULT_SIZE; - chanPtr->timer = NULL; - chanPtr->csPtr = NULL; - chanPtr->supercedes = (Channel*) NULL; - - chanPtr->outputStage = NULL; - if ((chanPtr->encoding != NULL) && (chanPtr->flags & TCL_WRITABLE)) { - chanPtr->outputStage = (char *) - ckalloc((unsigned) (chanPtr->bufSize + 2)); - } + statePtr->unreportedError = 0; + statePtr->refCount = 0; + statePtr->closeCbPtr = NULL; + statePtr->curOutPtr = NULL; + statePtr->outQueueHead = NULL; + statePtr->outQueueTail = NULL; + statePtr->saveInBufPtr = NULL; + statePtr->inQueueHead = NULL; + statePtr->inQueueTail = NULL; + statePtr->chPtr = NULL; + statePtr->interestMask = 0; + statePtr->scriptRecordPtr = NULL; + statePtr->bufSize = CHANNELBUFFER_DEFAULT_SIZE; + statePtr->timer = NULL; + statePtr->csPtrR = NULL; + statePtr->csPtrW = NULL; + statePtr->outputStage = NULL; + + /* + * As we are creating the channel, it is obviously the top for now. + */ + + statePtr->topChanPtr = chanPtr; + statePtr->bottomChanPtr = chanPtr; + chanPtr->downChanPtr = NULL; + chanPtr->upChanPtr = NULL; + chanPtr->inQueueHead = NULL; + chanPtr->inQueueTail = NULL; + + /* + * TIP #219, Tcl Channel Reflection API + */ + + statePtr->chanMsg = NULL; + statePtr->unreportedMsg = NULL; /* * Link the channel into the list of all channels; create an on-exit - * handler if there is not one already, to close off all the channels - * in the list on exit. + * handler if there is not one already, to close off all the channels in + * the list on exit. + * + * JH: Could call Tcl_SpliceChannel, but need to avoid NULL check. + * + * TIP #218. + * AK: Just initialize the field to NULL before invoking Tcl_SpliceChannel + * We need Tcl_SpliceChannel, for the threadAction calls. There is no + * real reason to duplicate all of this. + * NOTE: All drivers using thread actions now have to perform their TSD + * manipulation only in their thread action proc. Doing it when + * creating their instance structures will collide with the thread + * action activity and lead to damaged lists. */ - chanPtr->nextChanPtr = tsdPtr->firstChanPtr; - tsdPtr->firstChanPtr = chanPtr; + statePtr->nextCSPtr = NULL; + SpliceChannel((Tcl_Channel) chanPtr); /* - * Install this channel in the first empty standard channel slot, if - * the channel was previously closed explicitly. + * Install this channel in the first empty standard channel slot, if the + * channel was previously closed explicitly. */ if ((tsdPtr->stdinChannel == NULL) && (tsdPtr->stdinInitialized == 1)) { - Tcl_SetStdChannel((Tcl_Channel)chanPtr, TCL_STDIN); - Tcl_RegisterChannel((Tcl_Interp *) NULL, (Tcl_Channel) chanPtr); - } else if ((tsdPtr->stdoutChannel == NULL) && (tsdPtr->stdoutInitialized == 1)) { - Tcl_SetStdChannel((Tcl_Channel)chanPtr, TCL_STDOUT); - Tcl_RegisterChannel((Tcl_Interp *) NULL, (Tcl_Channel) chanPtr); - } else if ((tsdPtr->stderrChannel == NULL) && (tsdPtr->stderrInitialized == 1)) { - Tcl_SetStdChannel((Tcl_Channel)chanPtr, TCL_STDERR); - Tcl_RegisterChannel((Tcl_Interp *) NULL, (Tcl_Channel) chanPtr); - } + strcpy(tmp, "stdin"); + Tcl_SetStdChannel((Tcl_Channel) chanPtr, TCL_STDIN); + Tcl_RegisterChannel(NULL, (Tcl_Channel) chanPtr); + } else if ((tsdPtr->stdoutChannel == NULL) && + (tsdPtr->stdoutInitialized == 1)) { + strcpy(tmp, "stdout"); + Tcl_SetStdChannel((Tcl_Channel) chanPtr, TCL_STDOUT); + Tcl_RegisterChannel(NULL, (Tcl_Channel) chanPtr); + } else if ((tsdPtr->stderrChannel == NULL) && + (tsdPtr->stderrInitialized == 1)) { + strcpy(tmp, "stderr"); + Tcl_SetStdChannel((Tcl_Channel) chanPtr, TCL_STDERR); + Tcl_RegisterChannel(NULL, (Tcl_Channel) chanPtr); + } return (Tcl_Channel) chanPtr; } @@ -1353,279 +1650,192 @@ Tcl_CreateChannel(typePtr, chanName, instanceData, mask) * * Tcl_StackChannel -- * - * Replaces an entry in the hash table for a Tcl_Channel - * record. The replacement is a new channel with same name, - * it supercedes the replaced channel. Input and output of - * the superceded channel is now going through the newly - * created channel and allows the arbitrary filtering/manipulation - * of the dataflow. + * Replaces an entry in the hash table for a Tcl_Channel record. The + * replacement is a new channel with same name, it supercedes the + * replaced channel. Input and output of the superceded channel is now + * going through the newly created channel and allows the arbitrary + * filtering/manipulation of the dataflow. * - * Andreas Kupries <a.kupries@westend.com>, 12/13/1998 - * "Trf-Patch for filtering channels" + * Andreas Kupries <a.kupries@westend.com>, 12/13/1998 "Trf-Patch for + * filtering channels" * * Results: - * Returns the new Tcl_Channel, which actually contains the - * saved information about prevChan. + * Returns the new Tcl_Channel, which actually contains the saved + * information about prevChan. * * Side effects: - * A new channel structure is allocated and linked below - * the existing channel. The channel operations and client - * data of the existing channel are copied down to the newly - * created channel, and the current channel has its operations - * replaced by the new typePtr. + * A new channel structure is allocated and linked below the existing + * channel. The channel operations and client data of the existing + * channel are copied down to the newly created channel, and the current + * channel has its operations replaced by the new typePtr. * *---------------------------------------------------------------------- */ Tcl_Channel -Tcl_StackChannel(interp, typePtr, instanceData, mask, prevChan) - Tcl_Interp* interp; /* The interpreter we are working in */ - Tcl_ChannelType *typePtr; /* The channel type record for the new - * channel. */ - ClientData instanceData; /* Instance specific data for the new - * channel. */ - int mask; /* TCL_READABLE & TCL_WRITABLE to indicate - * if the channel is readable, writable. */ - Tcl_Channel prevChan; /* The channel structure to replace */ +Tcl_StackChannel( + Tcl_Interp *interp, /* The interpreter we are working in */ + const Tcl_ChannelType *typePtr, + /* The channel type record for the new + * channel. */ + ClientData instanceData, /* Instance specific data for the new + * channel. */ + int mask, /* TCL_READABLE & TCL_WRITABLE to indicate if + * the channel is readable, writable. */ + Tcl_Channel prevChan) /* The channel structure to replace */ { ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - Channel *chanPtr, *pt; - int interest = 0; + Channel *chanPtr, *prevChanPtr; + ChannelState *statePtr; /* - * AK, 06/30/1999 + * Find the given channel (prevChan) in the list of all channels. If we do + * not find it, then it was never registered correctly. * - * Tcl_StackChannel differs from Tcl_ReplaceChannel of the - * original "Trf" patch. Instead of seeing the - * newly created structure as the *new* channel to cover the specified - * one use it to *save* the current state of the specified channel and - * then reinitialize the current structure for the given transformation. - * - * Advantages: - * - No splicing into the (thread-)global list of channels (or the per- - * interp hash-tables). - * - Users of the C-API still have valid channel references even after - * the call to this procedure. - * - * Disadvantages: - * - Untested code. + * This operation should occur at the top of a channel stack. */ - /* - * Find the given channel in the list of all channels. - */ + statePtr = (ChannelState *) tsdPtr->firstCSPtr; + prevChanPtr = ((Channel *) prevChan)->state->topChanPtr; - pt = (Channel*) tsdPtr->firstChanPtr; - - while (pt != (Channel *) prevChan) { - pt = pt->nextChanPtr; + while ((statePtr != NULL) && (statePtr->topChanPtr != prevChanPtr)) { + statePtr = statePtr->nextCSPtr; } - /* - * 'pt == prevChan' now (or NULL, if not found). - */ - - if (!pt) { - return (Tcl_Channel) NULL; + if (statePtr == NULL) { + if (interp) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't find state for channel \"%s\"", + Tcl_GetChannelName(prevChan))); + } + return NULL; } /* - * Here we check if the given "mask" matches the "flags" - * of the already existing channel. + * Here we check if the given "mask" matches the "flags" of the already + * existing channel. * * | - | R | W | RW | * --+---+---+---+----+ <=> 0 != (chan->mask & prevChan->mask) * - | | | | | - * R | | + | | + | The superceding channel is allowed to - * W | | | + | + | restrict the capabilities of the - * RW| | + | + | + | superceded one ! + * R | | + | | + | The superceding channel is allowed to restrict + * W | | | + | + | the capabilities of the superceded one! + * RW| | + | + | + | * --+---+---+---+----+ */ - if ((mask & Tcl_GetChannelMode (prevChan)) == 0) { - return (Tcl_Channel) NULL; + if ((mask & (statePtr->flags & (TCL_READABLE | TCL_WRITABLE))) == 0) { + if (interp) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "reading and writing both disallowed for channel \"%s\"", + Tcl_GetChannelName(prevChan))); + } + return NULL; } - chanPtr = (Channel *) ckalloc((unsigned) sizeof(Channel)); - /* - * If there is some interest in the channel, remove it, break - * down the whole chain. It will be reconstructed later. + * Flush the buffers. This ensures that any data still in them at this + * time is not handled by the new transformation. Restrict this to + * writable channels. Take care to hide a possible bg-copy in progress + * from Tcl_Flush and the CheckForChannelErrors inside. */ - interest = pt->interestMask; - - pt->interestMask = 0; + if ((mask & TCL_WRITABLE) != 0) { + CopyState *csPtrR = statePtr->csPtrR; + CopyState *csPtrW = statePtr->csPtrW; - if (interest) { - (pt->typePtr->watchProc) (pt->instanceData, 0); - } - - /* - * Save some of the current state into the new structure, - * reinitialize the parts which will stay with the transformation. - * - * Remarks: - * - We cannot discard the buffers, and they cannot be used from the - * transformation placed later into the 'pt' structure. Save them, - * and believe that Tcl_SetChannelOption (buffering, none) will do - * the right thing. - * - encoding and EOL-translation control information is initialized - * to values for 'binary'. This is later reinforced via - * Tcl_SetChanneloption to get the handling of flags and the event - * system right. - * - The 'interestMask' of the saved channel is cleared, but the - * transformations WatchProc is used to establish the connection - * between transformation and underlying channel. This should - * reestablish the correct mask. - * - TTO = Transform Takes Over. The hidden channel no longer - * needs to perform this function. - */ - - chanPtr->channelName = (char *) ckalloc (strlen(pt->channelName)+1); - strcpy (chanPtr->channelName, pt->channelName); - - chanPtr->flags = pt->flags; /* Save */ - - chanPtr->encoding = (Tcl_Encoding) NULL; /* == 'binary' */ - chanPtr->inputEncodingState = (Tcl_EncodingState) NULL; - chanPtr->inputEncodingFlags = TCL_ENCODING_START; - chanPtr->outputEncodingState = (Tcl_EncodingState) NULL; - chanPtr->outputEncodingFlags = TCL_ENCODING_START; - - chanPtr->inputTranslation = TCL_TRANSLATE_LF; /* == 'binary' */ - chanPtr->outputTranslation = TCL_TRANSLATE_LF; /* == 'binary' */ - chanPtr->inEofChar = pt->inEofChar; /* Save */ - chanPtr->outEofChar = pt->outEofChar; /* Save */ - - chanPtr->unreportedError = pt->unreportedError; /* Save */ - chanPtr->instanceData = pt->instanceData; /* Save */ - chanPtr->typePtr = pt->typePtr; /* Save */ - chanPtr->refCount = 0; /* None, as the structure is covered */ - chanPtr->closeCbPtr = (CloseCallback*) NULL; /* TTO */ - - chanPtr->outputStage = (char*) NULL; - chanPtr->curOutPtr = pt->curOutPtr; /* Save */ - chanPtr->outQueueHead = pt->outQueueHead; /* Save */ - chanPtr->outQueueTail = pt->outQueueTail; /* Save */ - chanPtr->saveInBufPtr = pt->saveInBufPtr; /* Save */ - chanPtr->inQueueHead = pt->inQueueHead; /* Save */ - chanPtr->inQueueTail = pt->inQueueTail; /* Save */ - - chanPtr->chPtr = (ChannelHandler *) NULL; /* TTO */ - chanPtr->interestMask = 0; - chanPtr->nextChanPtr = (Channel*) NULL; /* Is not in list! */ - chanPtr->scriptRecordPtr = (EventScriptRecord *) NULL; /* TTO */ - chanPtr->bufSize = CHANNELBUFFER_DEFAULT_SIZE; - chanPtr->timer = (Tcl_TimerToken) NULL; /* TTO */ - chanPtr->csPtr = (CopyState*) NULL; /* TTO */ + statePtr->csPtrR = NULL; + statePtr->csPtrW = NULL; - /* - * Place new block at the head of a possibly existing list of previously - * stacked channels, then do the missing initializations of translation - * and buffer system. - */ - - chanPtr->supercedes = pt->supercedes; + /* + * TODO: Examine what can go wrong if Tcl_Flush() call disturbs + * the stacking state of this channel during its operations. + */ + if (Tcl_Flush((Tcl_Channel) prevChanPtr) != TCL_OK) { + statePtr->csPtrR = csPtrR; + statePtr->csPtrW = csPtrW; + if (interp) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "could not flush channel \"%s\"", + Tcl_GetChannelName(prevChan))); + } + return NULL; + } - Tcl_SetChannelOption (interp, (Tcl_Channel) chanPtr, - "-translation", "binary"); - Tcl_SetChannelOption (interp, (Tcl_Channel) chanPtr, - "-buffering", "none"); + statePtr->csPtrR = csPtrR; + statePtr->csPtrW = csPtrW; + } /* - * Save accomplished, now reinitialize the (old) structure for the - * transformation. - * - * - The information about encoding and eol-translation is taken - * without change. There is no need to fiddle with - * refCount et. al. + * Discard any input in the buffers. They are not yet read by the user of + * the channel, so they have to go through the new transformation before + * reading. As the buffers contain the untransformed form their contents + * are not only useless but actually distorts our view of the system. * - * Don't forget to use the same blocking mode as the old channel. + * To preserve the information without having to read them again and to + * avoid problems with the location in the channel (seeking might be + * impossible) we move the buffers from the common state structure into + * the channel itself. We use the buffers in the channel below the new + * transformation to hold the data. In the future this allows us to write + * transformations which pre-read data and push the unused part back when + * they are going away. */ - pt->flags = mask | (chanPtr->flags & CHANNEL_NONBLOCKING); - - /* - * EDITORS NOTE: all the lines with "take it as is" should get - * deleted once this code has been debugged. - */ - - /* pt->encoding, take it as is */ - /* pt->inputEncodingState, take it as is */ - /* pt->inputEncodingFlags, take it as is */ - /* pt->outputEncodingState, take it as is */ - /* pt->outputEncodingFlags, take it as is */ - - /* pt->inputTranslation, take it as is */ - /* pt->outputTranslation, take it as is */ - - /* - * No special EOF character, that condition is determined by the - * old channel - */ - - pt->inEofChar = 0; - pt->outEofChar = 0; - - pt->unreportedError = 0; /* No errors yet */ - pt->instanceData = instanceData; /* Transformation state */ - pt->typePtr = typePtr; /* Transformation type */ - /* pt->refCount, take it as it is */ - /* pt->closeCbPtr, take it as it is */ + if (((mask & TCL_READABLE) != 0) && (statePtr->inQueueHead != NULL)) { + /* + * Remark: It is possible that the channel buffers contain data from + * some earlier push-backs. + */ - /* pt->outputStage, take it as it is */ - pt->curOutPtr = (ChannelBuffer *) NULL; - pt->outQueueHead = (ChannelBuffer *) NULL; - pt->outQueueTail = (ChannelBuffer *) NULL; - pt->saveInBufPtr = (ChannelBuffer *) NULL; - pt->inQueueHead = (ChannelBuffer *) NULL; - pt->inQueueTail = (ChannelBuffer *) NULL; + statePtr->inQueueTail->nextPtr = prevChanPtr->inQueueHead; + prevChanPtr->inQueueHead = statePtr->inQueueHead; - /* pt->chPtr, take it as it is */ - /* pt->interestMask, take it as it is */ - /* pt->nextChanPtr, take it as it is */ - /* pt->scriptRecordPtr, take it as it is */ - pt->bufSize = CHANNELBUFFER_DEFAULT_SIZE; - /* pt->timer, take it as it is */ - /* pt->csPtr, take it as it is */ + if (prevChanPtr->inQueueTail == NULL) { + prevChanPtr->inQueueTail = statePtr->inQueueTail; + } - /* - * Have the transformation reference the new structure containing - * the saved channel. - */ + statePtr->inQueueHead = NULL; + statePtr->inQueueTail = NULL; + } - pt->supercedes = chanPtr; + chanPtr = ckalloc(sizeof(Channel)); /* - * Don't forget to reinitialize the output buffer used for encodings. + * Save some of the current state into the new structure, reinitialize the + * parts which will stay with the transformation. + * + * Remarks: */ - if ((chanPtr->encoding != NULL) && (chanPtr->flags & TCL_WRITABLE)) { - chanPtr->outputStage = (char *) - ckalloc((unsigned) (chanPtr->bufSize + 2)); - } + chanPtr->state = statePtr; + chanPtr->instanceData = instanceData; + chanPtr->typePtr = typePtr; + chanPtr->downChanPtr = prevChanPtr; + chanPtr->upChanPtr = NULL; + chanPtr->inQueueHead = NULL; + chanPtr->inQueueTail = NULL; /* - * Event handling: If the information in the old channel shows - * that there was interest in some events call the 'WatchProc' - * of the transformation to establish the proper connection - * between them. + * Place new block at the head of a possibly existing list of previously + * stacked channels. */ - if (interest) { - (pt->typePtr->watchProc) (pt->instanceData, interest); - } + prevChanPtr->upChanPtr = chanPtr; + statePtr->topChanPtr = chanPtr; /* - * The superceded channel is effectively unregistered - * We cannot decrement its reference count because that - * can cause it to get garbage collected out from under us. - * Don't add the following code: + * TIP #218, Channel Thread Actions. * - * chanPtr->supercedes->refCount --; + * We call the thread actions for the new channel directly. We _cannot_ + * use SpliceChannel, because the (thread-)global list of all channels + * always contains the _ChannelState_ for a stack of channels, not the + * individual channels. And SpliceChannel would not only call the thread + * actions, but also add the shared ChannelState to this list a second + * time, mangling it. */ + ChanThreadAction(chanPtr, TCL_CHANNEL_THREAD_INSERT); + return (Tcl_Channel) chanPtr; } @@ -1634,211 +1844,194 @@ Tcl_StackChannel(interp, typePtr, instanceData, mask, prevChan) * * Tcl_UnstackChannel -- * - * Unstacks an entry in the hash table for a Tcl_Channel - * record. This is the reverse to 'Tcl_StackChannel'. - * The old, superceded channel is uncovered and re-registered - * in the appropriate data structures. + * Unstacks an entry in the hash table for a Tcl_Channel record. This is + * the reverse to 'Tcl_StackChannel'. * * Results: - * Returns the old Tcl_Channel, i.e. the one which was stacked over. + * A standard Tcl result. * * Side effects: - * See above. + * If TCL_ERROR is returned, the posix error code will be set with + * Tcl_SetErrno. May leave a message in interp result as well. * *---------------------------------------------------------------------- */ -void -Tcl_UnstackChannel (interp, chan) - Tcl_Interp* interp; /* The interpreter we are working in */ - Tcl_Channel chan; /* The channel to unstack */ +int +Tcl_UnstackChannel( + Tcl_Interp *interp, /* The interpreter we are working in */ + Tcl_Channel chan) /* The channel to unstack */ { - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - Channel* chanPtr = (Channel*) chan; + Channel *chanPtr = (Channel *) chan; + ChannelState *statePtr = chanPtr->state; + int result = 0; - if (chanPtr->supercedes != (Channel*) NULL) { - /* + /* + * This operation should occur at the top of a channel stack. + */ + + chanPtr = statePtr->topChanPtr; + + if (chanPtr->downChanPtr != NULL) { + /* * Instead of manipulating the per-thread / per-interp list/hashtable - * of registered channels we wind down the state of the transformation, - * and then restore the state of underlying channel into the old - * structure. + * of registered channels we wind down the state of the + * transformation, and then restore the state of underlying channel + * into the old structure. */ - Tcl_DString dsTrans; /* storage to save option information */ - Tcl_DString dsBuf; /* storage to save option information */ - Channel top; /* Save area for current transformation */ - Channel* chanDownPtr = chanPtr->supercedes; - int interest; /* interest mask of transformation - * before destruct. */ - int saveInputEncodingFlags; /* Save area for encoding */ - int saveOutputEncodingFlags; /* related information */ - Tcl_EncodingState saveInputEncodingState; - Tcl_EncodingState saveOutputEncodingState; - Tcl_Encoding saveEncoding; - /* - * Event handling: Disallow the delivery of events from the - * old, now uncovered channel to the transformation. - * - * This is done before everything else to avoid problems - * after our heavy-duty shuffling of pointers around. + * TODO: Figure out how to handle the situation where the chan + * operations called below by this unstacking operation cause + * another unstacking recursively. In that case the downChanPtr + * value we're holding on to will not be the right thing. */ - interest = chanPtr->interestMask; - (chanPtr->typePtr->watchProc) (chanPtr->instanceData, 0); + Channel *downChanPtr = chanPtr->downChanPtr; - /* 1. Swap the information in the top channel (the transformation) - * and the channel below, with some exceptions. This additionally - * cuts the top channel out of the chain. Without the latter - * a Tcl_Close on the transformation would be impossible, as that - * procedure will free the structure, making 'top' unusable. - * - * chanPtr -> top channel, transformation. - * chanDownPtr -> channel immediately below the transformation. + /* + * Flush the buffers. This ensures that any data still in them at this + * time _is_ handled by the transformation we are unstacking right + * now. Restrict this to writable channels. Take care to hide a + * possible bg-copy in progress from Tcl_Flush and the + * CheckForChannelErrors inside. */ - memcpy ((void*) &top, (void*) chanPtr, sizeof (Channel)); - memcpy ((void*) chanPtr, (void*) chanDownPtr, sizeof (Channel)); - top.supercedes = (Channel*) NULL; - memcpy ((void*) chanDownPtr, (void*) &top, sizeof (Channel)); - - /* Now: - * chanPtr -> channel immediately below the transformation, now top - * chanDownPtr -> transformation, cut loose. - * - * Handle the exceptions mentioned above, i.e. move the information - * from the transformation into the new top, and reinitialize it to - * safe values in the transformation. - */ - - chanPtr->refCount = chanDownPtr->refCount; - chanPtr->closeCbPtr = chanDownPtr->closeCbPtr; - chanPtr->chPtr = chanDownPtr->chPtr; - chanPtr->nextChanPtr = chanDownPtr->nextChanPtr; - chanPtr->scriptRecordPtr = chanDownPtr->scriptRecordPtr; - chanPtr->timer = chanDownPtr->timer; - chanPtr->csPtr = chanDownPtr->csPtr; - - chanDownPtr->refCount = 0; - chanDownPtr->closeCbPtr = (CloseCallback*) NULL; - chanDownPtr->chPtr = (ChannelHandler*) NULL; - chanDownPtr->nextChanPtr = (Channel*) NULL; - chanDownPtr->scriptRecordPtr = (EventScriptRecord*) NULL; - chanDownPtr->timer = (Tcl_TimerToken) NULL; - chanDownPtr->csPtr = (CopyState*) NULL; - - /* The now uncovered channel still has encoding and eol-translation - * deactivated, i.e. switched to 'binary'. *Don't* touch this until - * after the transformation is closed for good, as it may write - * information into it during that (-> flushing of data waiting in - * internal buffers!) and rely on these settings. Thanks to Matt - * Newman <matt@sensus.org> for finding this goof. - * - * But we also have to protect the state of the encoding from removal - * during the close. So we save it in some local variables. - * Additionally the current value of the options is lost after we - * close, we have to save them now. - */ + if (GotFlag(statePtr, TCL_WRITABLE)) { + CopyState *csPtrR = statePtr->csPtrR; + CopyState *csPtrW = statePtr->csPtrW; - saveEncoding = chanDownPtr->encoding; - saveInputEncodingState = chanDownPtr->inputEncodingState; - saveInputEncodingFlags = chanDownPtr->inputEncodingFlags; - saveOutputEncodingState = chanDownPtr->outputEncodingState; - saveOutputEncodingFlags = chanDownPtr->outputEncodingFlags; + statePtr->csPtrR = NULL; + statePtr->csPtrW = NULL; + + if (Tcl_Flush((Tcl_Channel) chanPtr) != TCL_OK) { + statePtr->csPtrR = csPtrR; + statePtr->csPtrW = csPtrW; + + /* + * TIP #219, Tcl Channel Reflection API. + * Move error messages put by the driver into the chan/ip + * bypass area into the regular interpreter result. Fall back + * to the regular message if nothing was found in the + * bypasses. + */ - Tcl_DStringInit (&dsTrans); - Tcl_GetChannelOption (interp, (Tcl_Channel) chanDownPtr, - "-translation", &dsTrans); + if (!TclChanCaughtErrorBypass(interp, chan) && interp) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "could not flush channel \"%s\"", + Tcl_GetChannelName((Tcl_Channel) chanPtr))); + } + return TCL_ERROR; + } - Tcl_DStringInit (&dsBuf); - Tcl_GetChannelOption (interp, (Tcl_Channel) chanDownPtr, - "-buffering", &dsBuf); + statePtr->csPtrR = csPtrR; + statePtr->csPtrW = csPtrW; + } /* - * Prevent the accidential removal of the encoding during - * the destruction of the transformation channel. + * Anything in the input queue and the push-back buffers of the + * transformation going away is transformed data, but not yet read. As + * unstacking means that the caller does not want to see transformed + * data any more we have to discard these bytes. To avoid writing an + * analogue to 'DiscardInputQueued' we move the information in the + * push back buffers to the input queue and then call + * 'DiscardInputQueued' on that. */ - chanDownPtr->encoding = (Tcl_Encoding) NULL; - chanDownPtr->inputEncodingState = (Tcl_EncodingState) NULL; - chanDownPtr->inputEncodingFlags = TCL_ENCODING_START; - chanDownPtr->outputEncodingState = (Tcl_EncodingState) NULL; - chanDownPtr->outputEncodingFlags = TCL_ENCODING_START; + if (GotFlag(statePtr, TCL_READABLE) && + ((statePtr->inQueueHead != NULL) || + (chanPtr->inQueueHead != NULL))) { + if ((statePtr->inQueueHead != NULL) && + (chanPtr->inQueueHead != NULL)) { + statePtr->inQueueTail->nextPtr = chanPtr->inQueueHead; + statePtr->inQueueTail = chanPtr->inQueueTail; + statePtr->inQueueHead = statePtr->inQueueTail; + } else if (chanPtr->inQueueHead != NULL) { + statePtr->inQueueHead = chanPtr->inQueueHead; + statePtr->inQueueTail = chanPtr->inQueueTail; + } + + chanPtr->inQueueHead = NULL; + chanPtr->inQueueTail = NULL; + + DiscardInputQueued(statePtr, 0); + } /* - * A little trick: Add the transformation structure to the - * per-thread list of existing channels (which it never were - * part of so far), or Tcl_Close/FlushChannel will panic - * ("damaged channel list"). - * - * Afterward do a regular close upon the transformation. - * This may cause flushing of data into the old channel (if the - * transformation remembered its own channel in itself). + * TIP #218, Channel Thread Actions. * - * We know that its refCount dropped to 0. + * We call the thread actions for the new channel directly. We + * _cannot_ use CutChannel, because the (thread-)global list of all + * channels always contains the _ChannelState_ for a stack of + * channels, not the individual channels. And SpliceChannel would not + * only call the thread actions, but also remove the shared + * ChannelState from this list despite there being more channels for + * the state which are still active. */ - chanDownPtr->nextChanPtr = tsdPtr->firstChanPtr; - tsdPtr->firstChanPtr = chanDownPtr; + ChanThreadAction(chanPtr, TCL_CHANNEL_THREAD_REMOVE); - Tcl_Close (interp, (Tcl_Channel)chanDownPtr); + statePtr->topChanPtr = downChanPtr; + downChanPtr->upChanPtr = NULL; /* - * Now it is possible to wind down the transformation (in 'top'), - * especially to copy the current encoding and translation control - * information down. + * Leave this link intact for closeproc + * chanPtr->downChanPtr = NULL; */ - + /* - * Move the currently active encoding from the save area - * to the now uncovered channel. We assume here that this - * channel uses 'encoding binary' (==> encoding == NULL, etc. - * This allows us to simply copy the pointers without having to - * think about refcounts and deallocation of the old encoding. - * - * And don't forget to reenable the EOL-translation used by the - * transformation. Using a DString to do this *is* a bit awkward, - * but still the best way to handle the complexities here, like - * flag manipulation and event system. + * Close and free the channel driver state. */ - chanPtr->encoding = saveEncoding; - chanPtr->inputEncodingState = saveInputEncodingState; - chanPtr->inputEncodingFlags = saveInputEncodingFlags; - chanPtr->outputEncodingState = saveOutputEncodingState; - chanPtr->outputEncodingFlags = saveOutputEncodingFlags; + result = ChanClose(chanPtr, interp); + chanPtr->typePtr = NULL; - Tcl_SetChannelOption (interp, (Tcl_Channel) chanPtr, - "-translation", dsTrans.string); + /* + * AK: Tcl_NotifyChannel may hold a reference to this block of memory + */ - Tcl_SetChannelOption (interp, (Tcl_Channel) chanPtr, - "-buffering", dsBuf.string); + Tcl_EventuallyFree(chanPtr, TCL_DYNAMIC); + UpdateInterest(statePtr->topChanPtr); - Tcl_DStringFree (&dsTrans); - Tcl_DStringFree (&dsBuf); + if (result != 0) { + Tcl_SetErrno(result); - /* - * Event handling: If the information from the now destroyed - * transformation shows that there was interest in some events - * call the 'WatchProc' of the now uncovered channel to renew - * that interest with underlying channels or the driver. - */ + /* + * TIP #219, Tcl Channel Reflection API. + * Move error messages put by the driver into the chan/ip bypass + * area into the regular interpreter result. + */ - if (interest) { - chanPtr->interestMask = 0; - (chanPtr->typePtr->watchProc) (chanPtr->instanceData, - interest); + TclChanCaughtErrorBypass(interp, chan); + return TCL_ERROR; } - } else { - /* This channel does not cover another one. - * Simply do a close, if necessary. + /* + * This channel does not cover another one. Simply do a close, if + * necessary. */ - if (chanPtr->refCount == 0) { - Tcl_Close (interp, chan); + if (statePtr->refCount <= 0) { + if (Tcl_Close(interp, chan) != TCL_OK) { + /* + * TIP #219, Tcl Channel Reflection API. + * "TclChanCaughtErrorBypass" is not required here, it was + * done already by "Tcl_Close". + */ + + return TCL_ERROR; + } } + + /* + * TIP #218, Channel Thread Actions. + * Not required in this branch, this is done by Tcl_Close. If + * Tcl_Close is not called then the ChannelState is still active in + * the thread and no action has to be taken either. + */ } + + return TCL_OK; } /* @@ -1846,12 +2039,12 @@ Tcl_UnstackChannel (interp, chan) * * Tcl_GetStackedChannel -- * - * Determines wether the specified channel is stacked upon another. + * Determines whether the specified channel is stacked upon another. * * Results: - * NULL if the channel is not stacked upon another one, or a reference - * to the channel it is stacked upon. This reference can be used in - * queries, but modification is not allowed. + * NULL if the channel is not stacked upon another one, or a reference to + * the channel it is stacked upon. This reference can be used in queries, + * but modification is not allowed. * * Side effects: * None. @@ -1860,23 +2053,26 @@ Tcl_UnstackChannel (interp, chan) */ Tcl_Channel -Tcl_GetStackedChannel(chan) - Tcl_Channel chan; +Tcl_GetStackedChannel( + Tcl_Channel chan) { - Channel* chanPtr = (Channel*) chan; - return (Tcl_Channel) chanPtr->supercedes; + Channel *chanPtr = (Channel *) chan; + /* The actual channel. */ + + return (Tcl_Channel) chanPtr->downChanPtr; } /* *---------------------------------------------------------------------- * - * Tcl_GetChannelMode -- + * Tcl_GetTopChannel -- * - * Computes a mask indicating whether the channel is open for - * reading and writing. + * Returns the top channel of a channel stack. * * Results: - * An OR-ed combination of TCL_READABLE and TCL_WRITABLE. + * NULL if the channel is not stacked upon another one, or a reference to + * the channel it is stacked upon. This reference can be used in queries, + * but modification is not allowed. * * Side effects: * None. @@ -1884,28 +2080,25 @@ Tcl_GetStackedChannel(chan) *---------------------------------------------------------------------- */ -int -Tcl_GetChannelMode(chan) - Tcl_Channel chan; /* The channel for which the mode is - * being computed. */ +Tcl_Channel +Tcl_GetTopChannel( + Tcl_Channel chan) { - Channel *chanPtr; /* The actual channel. */ + Channel *chanPtr = (Channel *) chan; + /* The actual channel. */ - chanPtr = (Channel *) chan; - return (chanPtr->flags & (TCL_READABLE | TCL_WRITABLE)); + return (Tcl_Channel) chanPtr->state->topChanPtr; } /* *---------------------------------------------------------------------- * - * Tcl_GetChannelName -- + * Tcl_GetChannelInstanceData -- * - * Returns the string identifying the channel name. + * Returns the client data associated with a channel. * * Results: - * The string containing the channel name. This memory is - * owned by the generic layer and should not be modified by - * the caller. + * The client data. * * Side effects: * None. @@ -1913,14 +2106,41 @@ Tcl_GetChannelMode(chan) *---------------------------------------------------------------------- */ -char * -Tcl_GetChannelName(chan) - Tcl_Channel chan; /* The channel for which to return the name. */ +ClientData +Tcl_GetChannelInstanceData( + Tcl_Channel chan) /* Channel for which to return client data. */ { - Channel *chanPtr; /* The actual channel. */ + Channel *chanPtr = (Channel *) chan; + /* The actual channel. */ - chanPtr = (Channel *) chan; - return chanPtr->channelName; + return chanPtr->instanceData; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetChannelThread -- + * + * Given a channel structure, returns the thread managing it. TIP #10 + * + * Results: + * Returns the id of the thread managing the channel. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_ThreadId +Tcl_GetChannelThread( + Tcl_Channel chan) /* The channel to return the managing thread + * for. */ +{ + Channel *chanPtr = (Channel *) chan; + /* The actual channel. */ + + return chanPtr->state->managingThread; } /* @@ -1939,26 +2159,26 @@ Tcl_GetChannelName(chan) *---------------------------------------------------------------------- */ -Tcl_ChannelType * -Tcl_GetChannelType(chan) - Tcl_Channel chan; /* The channel to return type for. */ +const Tcl_ChannelType * +Tcl_GetChannelType( + Tcl_Channel chan) /* The channel to return type for. */ { - Channel *chanPtr; /* The actual channel. */ + Channel *chanPtr = (Channel *) chan; + /* The actual channel. */ - chanPtr = (Channel *) chan; return chanPtr->typePtr; } /* *---------------------------------------------------------------------- * - * Tcl_GetChannelHandle -- + * Tcl_GetChannelMode -- * - * Returns an OS handle associated with a channel. + * Computes a mask indicating whether the channel is open for reading and + * writing. * * Results: - * Returns TCL_OK and places the handle in handlePtr, or returns - * TCL_ERROR on failure. + * An OR-ed combination of TCL_READABLE and TCL_WRITABLE. * * Side effects: * None. @@ -1967,33 +2187,26 @@ Tcl_GetChannelType(chan) */ int -Tcl_GetChannelHandle(chan, direction, handlePtr) - Tcl_Channel chan; /* The channel to get file from. */ - int direction; /* TCL_WRITABLE or TCL_READABLE. */ - ClientData *handlePtr; /* Where to store handle */ +Tcl_GetChannelMode( + Tcl_Channel chan) /* The channel for which the mode is being + * computed. */ { - Channel *chanPtr; /* The actual channel. */ - ClientData handle; - int result; + ChannelState *statePtr = ((Channel *) chan)->state; + /* State of actual channel. */ - chanPtr = (Channel *) chan; - result = (chanPtr->typePtr->getHandleProc)(chanPtr->instanceData, - direction, &handle); - if (handlePtr) { - *handlePtr = handle; - } - return result; + return (statePtr->flags & (TCL_READABLE | TCL_WRITABLE)); } /* *---------------------------------------------------------------------- * - * Tcl_GetChannelInstanceData -- + * Tcl_GetChannelName -- * - * Returns the client data associated with a channel. + * Returns the string identifying the channel name. * * Results: - * The client data. + * The string containing the channel name. This memory is owned by the + * generic layer and should not be modified by the caller. * * Side effects: * None. @@ -2001,14 +2214,56 @@ Tcl_GetChannelHandle(chan, direction, handlePtr) *---------------------------------------------------------------------- */ -ClientData -Tcl_GetChannelInstanceData(chan) - Tcl_Channel chan; /* Channel for which to return client data. */ +const char * +Tcl_GetChannelName( + Tcl_Channel chan) /* The channel for which to return the name. */ +{ + ChannelState *statePtr = ((Channel *) chan)->state; + /* State of actual channel. */ + + return statePtr->channelName; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetChannelHandle -- + * + * Returns an OS handle associated with a channel. + * + * Results: + * Returns TCL_OK and places the handle in handlePtr, or returns + * TCL_ERROR on failure. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_GetChannelHandle( + Tcl_Channel chan, /* The channel to get file from. */ + int direction, /* TCL_WRITABLE or TCL_READABLE. */ + ClientData *handlePtr) /* Where to store handle */ { Channel *chanPtr; /* The actual channel. */ + ClientData handle; + int result; - chanPtr = (Channel *) chan; - return chanPtr->instanceData; + chanPtr = ((Channel *) chan)->state->bottomChanPtr; + if (!chanPtr->typePtr->getHandleProc) { + Tcl_SetChannelError(chan, Tcl_ObjPrintf( + "channel \"%s\" does not support OS handles", + Tcl_GetChannelName(chan))); + return TCL_ERROR; + } + result = chanPtr->typePtr->getHandleProc(chanPtr->instanceData, direction, + &handle); + if (handlePtr) { + *handlePtr = handle; + } + return result; } /* @@ -2016,16 +2271,15 @@ Tcl_GetChannelInstanceData(chan) * * AllocChannelBuffer -- * - * A channel buffer has BUFFER_PADDING bytes extra at beginning to - * hold any bytes of a native-encoding character that got split by - * the end of the previous buffer and need to be moved to the - * beginning of the next buffer to make a contiguous string so it - * can be converted to UTF-8. + * A channel buffer has BUFFER_PADDING bytes extra at beginning to hold + * any bytes of a native-encoding character that got split by the end of + * the previous buffer and need to be moved to the beginning of the next + * buffer to make a contiguous string so it can be converted to UTF-8. * - * A channel buffer has BUFFER_PADDING bytes extra at the end to - * hold any bytes of a native-encoding character (generated from a - * UTF-8 character) that overflow past the end of the buffer and - * need to be moved to the next buffer. + * A channel buffer has BUFFER_PADDING bytes extra at the end to hold any + * bytes of a native-encoding character (generated from a UTF-8 + * character) that overflow past the end of the buffer and need to be + * moved to the next buffer. * * Results: * A newly allocated channel buffer. @@ -2037,31 +2291,55 @@ Tcl_GetChannelInstanceData(chan) */ static ChannelBuffer * -AllocChannelBuffer(length) - int length; /* Desired length of channel buffer. */ +AllocChannelBuffer( + int length) /* Desired length of channel buffer. */ { ChannelBuffer *bufPtr; int n; n = length + CHANNELBUFFER_HEADER_SIZE + BUFFER_PADDING + BUFFER_PADDING; - bufPtr = (ChannelBuffer *) ckalloc((unsigned) n); + bufPtr = ckalloc(n); bufPtr->nextAdded = BUFFER_PADDING; bufPtr->nextRemoved = BUFFER_PADDING; bufPtr->bufLength = length + BUFFER_PADDING; - bufPtr->nextPtr = (ChannelBuffer *) NULL; + bufPtr->nextPtr = NULL; + bufPtr->refCount = 1; return bufPtr; } + +static void +PreserveChannelBuffer( + ChannelBuffer *bufPtr) +{ + bufPtr->refCount++; +} + +static void +ReleaseChannelBuffer( + ChannelBuffer *bufPtr) +{ + if (--bufPtr->refCount) { + return; + } + ckfree(bufPtr); +} + +static int +IsShared( + ChannelBuffer *bufPtr) +{ + return bufPtr->refCount > 1; +} /* *---------------------------------------------------------------------- * * RecycleBuffer -- * - * Helper function to recycle input and output buffers. Ensures - * that two input buffers are saved (one in the input queue and - * another in the saveInBufPtr field) and that curOutPtr is set - * to a buffer. Only if these conditions are met is the buffer - * freed to the OS. + * Helper function to recycle input and output buffers. Ensures that two + * input buffers are saved (one in the input queue and another in the + * saveInBufPtr field) and that curOutPtr is set to a buffer. Only if + * these conditions are met is the buffer freed to the OS. * * Results: * None. @@ -2073,59 +2351,73 @@ AllocChannelBuffer(length) */ static void -RecycleBuffer(chanPtr, bufPtr, mustDiscard) - Channel *chanPtr; /* Channel for which to recycle buffers. */ - ChannelBuffer *bufPtr; /* The buffer to recycle. */ - int mustDiscard; /* If nonzero, free the buffer to the - * OS, always. */ +RecycleBuffer( + ChannelState *statePtr, /* ChannelState in which to recycle buffers. */ + ChannelBuffer *bufPtr, /* The buffer to recycle. */ + int mustDiscard) /* If nonzero, free the buffer to the OS, + * always. */ { /* * Do we have to free the buffer to the OS? */ + if (IsShared(bufPtr)) { + mustDiscard = 1; + } if (mustDiscard) { - ckfree((char *) bufPtr); - return; + ReleaseChannelBuffer(bufPtr); + return; } - + + /* + * Only save buffers which are at least as big as the requested buffersize + * for the channel. This is to honor dynamic changes of the buffersize + * made by the user. + */ + + if ((bufPtr->bufLength - BUFFER_PADDING) < statePtr->bufSize) { + ReleaseChannelBuffer(bufPtr); + return; + } + /* * Only save buffers for the input queue if the channel is readable. */ - - if (chanPtr->flags & TCL_READABLE) { - if (chanPtr->inQueueHead == (ChannelBuffer *) NULL) { - chanPtr->inQueueHead = bufPtr; - chanPtr->inQueueTail = bufPtr; - goto keepit; - } - if (chanPtr->saveInBufPtr == (ChannelBuffer *) NULL) { - chanPtr->saveInBufPtr = bufPtr; - goto keepit; - } + + if (GotFlag(statePtr, TCL_READABLE)) { + if (statePtr->inQueueHead == NULL) { + statePtr->inQueueHead = bufPtr; + statePtr->inQueueTail = bufPtr; + goto keepBuffer; + } + if (statePtr->saveInBufPtr == NULL) { + statePtr->saveInBufPtr = bufPtr; + goto keepBuffer; + } } /* * Only save buffers for the output queue if the channel is writable. */ - if (chanPtr->flags & TCL_WRITABLE) { - if (chanPtr->curOutPtr == (ChannelBuffer *) NULL) { - chanPtr->curOutPtr = bufPtr; - goto keepit; - } + if (GotFlag(statePtr, TCL_WRITABLE)) { + if (statePtr->curOutPtr == NULL) { + statePtr->curOutPtr = bufPtr; + goto keepBuffer; + } } /* * If we reached this code we return the buffer to the OS. */ - ckfree((char *) bufPtr); + ReleaseChannelBuffer(bufPtr); return; -keepit: + keepBuffer: bufPtr->nextRemoved = BUFFER_PADDING; bufPtr->nextAdded = BUFFER_PADDING; - bufPtr->nextPtr = (ChannelBuffer *) NULL; + bufPtr->nextPtr = NULL; } /* @@ -2145,18 +2437,18 @@ keepit: */ static void -DiscardOutputQueued(chanPtr) - Channel *chanPtr; /* The channel for which to discard output. */ +DiscardOutputQueued( + ChannelState *statePtr) /* ChannelState for which to discard output. */ { ChannelBuffer *bufPtr; - - while (chanPtr->outQueueHead != (ChannelBuffer *) NULL) { - bufPtr = chanPtr->outQueueHead; - chanPtr->outQueueHead = bufPtr->nextPtr; - RecycleBuffer(chanPtr, bufPtr, 0); + + while (statePtr->outQueueHead != NULL) { + bufPtr = statePtr->outQueueHead; + statePtr->outQueueHead = bufPtr->nextPtr; + RecycleBuffer(statePtr, bufPtr, 0); } - chanPtr->outQueueHead = (ChannelBuffer *) NULL; - chanPtr->outQueueTail = (ChannelBuffer *) NULL; + statePtr->outQueueHead = NULL; + statePtr->outQueueTail = NULL; } /* @@ -2164,33 +2456,33 @@ DiscardOutputQueued(chanPtr) * * CheckForDeadChannel -- * - * This function checks is a given channel is Dead. - * (A channel that has been closed but not yet deallocated.) + * This function checks is a given channel is Dead (a channel that has + * been closed but not yet deallocated.) * * Results: * True (1) if channel is Dead, False (0) if channel is Ok * * Side effects: - * None + * None * *---------------------------------------------------------------------- */ static int -CheckForDeadChannel(interp, chanPtr) - Tcl_Interp *interp; /* For error reporting (can be NULL) */ - Channel *chanPtr; /* The channel to check. */ +CheckForDeadChannel( + Tcl_Interp *interp, /* For error reporting (can be NULL) */ + ChannelState *statePtr) /* The channel state to check. */ { - if (chanPtr->flags & CHANNEL_DEAD) { - Tcl_SetErrno(EINVAL); - if (interp) { - Tcl_AppendResult(interp, - "unable to access channel: invalid channel", - (char *) NULL); - } - return 1; + if (!GotFlag(statePtr, CHANNEL_DEAD)) { + return 0; } - return 0; + + Tcl_SetErrno(EINVAL); + if (interp) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "unable to access channel: invalid channel", -1)); + } + return 1; } /* @@ -2198,215 +2490,276 @@ CheckForDeadChannel(interp, chanPtr) * * FlushChannel -- * - * This function flushes as much of the queued output as is possible - * now. If calledFromAsyncFlush is nonzero, it is being called in an - * event handler to flush channel output asynchronously. + * This function flushes as much of the queued output as is possible now. + * If calledFromAsyncFlush is nonzero, it is being called in an event + * handler to flush channel output asynchronously. * * Results: - * 0 if successful, else the error code that was returned by the - * channel type operation. + * 0 if successful, else the error code that was returned by the channel + * type operation. May leave a message in the interp result. * * Side effects: - * May produce output on a channel. May block indefinitely if the - * channel is synchronous. May schedule an async flush on the channel. - * May recycle memory for buffers in the output queue. + * May produce output on a channel. May block indefinitely if the channel + * is synchronous. May schedule an async flush on the channel. May + * recycle memory for buffers in the output queue. * *---------------------------------------------------------------------- */ static int -FlushChannel(interp, chanPtr, calledFromAsyncFlush) - Tcl_Interp *interp; /* For error reporting during close. */ - Channel *chanPtr; /* The channel to flush on. */ - int calledFromAsyncFlush; /* If nonzero then we are being - * called from an asynchronous - * flush callback. */ -{ - ChannelBuffer *bufPtr; /* Iterates over buffered output - * queue. */ - int toWrite; /* Amount of output data in current - * buffer available to be written. */ - int written; /* Amount of output data actually - * written in current round. */ - int errorCode = 0; /* Stores POSIX error codes from - * channel driver operations. */ - int wroteSome = 0; /* Set to one if any data was - * written to the driver. */ - - /* - * Prevent writing on a dead channel -- a channel that has been closed - * but not yet deallocated. This can occur if the exit handler for the - * channel deallocation runs before all channels are deregistered in - * all interpreters. - */ - - if (CheckForDeadChannel(interp,chanPtr)) return -1; - - /* - * Loop over the queued buffers and attempt to flush as - * much as possible of the queued output to the channel. +FlushChannel( + Tcl_Interp *interp, /* For error reporting during close. */ + Channel *chanPtr, /* The channel to flush on. */ + int calledFromAsyncFlush) /* If nonzero then we are being called from an + * asynchronous flush callback. */ +{ + ChannelState *statePtr = chanPtr->state; + /* State of the channel stack. */ + ChannelBuffer *bufPtr; /* Iterates over buffered output queue. */ + int toWrite; /* Amount of output data in current buffer + * available to be written. */ + int written; /* Amount of output data actually written in + * current round. */ + int errorCode = 0; /* Stores POSIX error codes from channel + * driver operations. */ + int wroteSome = 0; /* Set to one if any data was written to the + * driver. */ + + /* + * Prevent writing on a dead channel -- a channel that has been closed but + * not yet deallocated. This can occur if the exit handler for the channel + * deallocation runs before all channels are deregistered in all + * interpreters. + */ + + if (CheckForDeadChannel(interp, statePtr)) { + return -1; + } + + /* + * Loop over the queued buffers and attempt to flush as much as possible + * of the queued output to the channel. */ + Tcl_Preserve(chanPtr); while (1) { + /* + * If the queue is empty and there is a ready current buffer, OR if + * the current buffer is full, then move the current buffer to the + * queue. + */ - /* - * If the queue is empty and there is a ready current buffer, OR if - * the current buffer is full, then move the current buffer to the - * queue. - */ - - if (((chanPtr->curOutPtr != (ChannelBuffer *) NULL) && - (chanPtr->curOutPtr->nextAdded == chanPtr->curOutPtr->bufLength)) - || ((chanPtr->flags & BUFFER_READY) && - (chanPtr->outQueueHead == (ChannelBuffer *) NULL))) { - chanPtr->flags &= (~(BUFFER_READY)); - chanPtr->curOutPtr->nextPtr = (ChannelBuffer *) NULL; - if (chanPtr->outQueueHead == (ChannelBuffer *) NULL) { - chanPtr->outQueueHead = chanPtr->curOutPtr; - } else { - chanPtr->outQueueTail->nextPtr = chanPtr->curOutPtr; - } - chanPtr->outQueueTail = chanPtr->curOutPtr; - chanPtr->curOutPtr = (ChannelBuffer *) NULL; - } - bufPtr = chanPtr->outQueueHead; + if (((statePtr->curOutPtr != NULL) && + IsBufferFull(statePtr->curOutPtr)) + || (GotFlag(statePtr, BUFFER_READY) && + (statePtr->outQueueHead == NULL))) { + ResetFlag(statePtr, BUFFER_READY); + statePtr->curOutPtr->nextPtr = NULL; + if (statePtr->outQueueHead == NULL) { + statePtr->outQueueHead = statePtr->curOutPtr; + } else { + statePtr->outQueueTail->nextPtr = statePtr->curOutPtr; + } + statePtr->outQueueTail = statePtr->curOutPtr; + statePtr->curOutPtr = NULL; + } + bufPtr = statePtr->outQueueHead; - /* - * If we are not being called from an async flush and an async - * flush is active, we just return without producing any output. - */ + /* + * If we are not being called from an async flush and an async flush + * is active, we just return without producing any output. + */ - if ((!calledFromAsyncFlush) && - (chanPtr->flags & BG_FLUSH_SCHEDULED)) { - return 0; - } + if (!calledFromAsyncFlush && GotFlag(statePtr, BG_FLUSH_SCHEDULED)) { + errorCode = 0; + goto done; + } - /* - * If the output queue is still empty, break out of the while loop. - */ + /* + * If the output queue is still empty, break out of the while loop. + */ - if (bufPtr == (ChannelBuffer *) NULL) { - break; /* Out of the "while (1)". */ - } + if (bufPtr == NULL) { + break; /* Out of the "while (1)". */ + } - /* - * Produce the output on the channel. - */ - - toWrite = bufPtr->nextAdded - bufPtr->nextRemoved; - written = (chanPtr->typePtr->outputProc) (chanPtr->instanceData, - (char *) bufPtr->buf + bufPtr->nextRemoved, toWrite, - &errorCode); - /* - * If the write failed completely attempt to start the asynchronous - * flush mechanism and break out of this loop - do not attempt to - * write any more output at this time. - */ + * Produce the output on the channel. + */ - if (written < 0) { - - /* - * If the last attempt to write was interrupted, simply retry. - */ - - if (errorCode == EINTR) { - errorCode = 0; - continue; - } + PreserveChannelBuffer(bufPtr); + toWrite = BytesLeft(bufPtr); + if (toWrite == 0) { + written = 0; + } else { + written = ChanWrite(chanPtr, RemovePoint(bufPtr), toWrite, + &errorCode); + } - /* - * If the channel is non-blocking and we would have blocked, - * start a background flushing handler and break out of the loop. - */ + /* + * If the write failed completely attempt to start the asynchronous + * flush mechanism and break out of this loop - do not attempt to + * write any more output at this time. + */ + + if (written < 0) { + /* + * If the last attempt to write was interrupted, simply retry. + */ + + if (errorCode == EINTR) { + errorCode = 0; + continue; + } + + /* + * If the channel is non-blocking and we would have blocked, start + * a background flushing handler and break out of the loop. + */ - if ((errorCode == EWOULDBLOCK) || (errorCode == EAGAIN)) { + if ((errorCode == EWOULDBLOCK) || (errorCode == EAGAIN)) { /* - * This used to check for CHANNEL_NONBLOCKING, and panic - * if the channel was blocking. However, it appears - * that setting stdin to -blocking 0 has some effect - * on the stdout when it's a tty channel + * This used to check for CHANNEL_NONBLOCKING, and panic if + * the channel was blocking. However, it appears that setting + * stdin to -blocking 0 has some effect on the stdout when + * it's a tty channel (dup'ed underneath) */ - if (!(chanPtr->flags & BG_FLUSH_SCHEDULED)) { - chanPtr->flags |= BG_FLUSH_SCHEDULED; + + if (!GotFlag(statePtr, BG_FLUSH_SCHEDULED) && !TclInExit()) { + SetFlag(statePtr, BG_FLUSH_SCHEDULED); UpdateInterest(chanPtr); } errorCode = 0; break; - } + } - /* - * Decide whether to report the error upwards or defer it. - */ - - if (calledFromAsyncFlush) { - if (chanPtr->unreportedError == 0) { - chanPtr->unreportedError = errorCode; - } - } else { - Tcl_SetErrno(errorCode); - if (interp != NULL) { - Tcl_SetResult(interp, - Tcl_PosixError(interp), TCL_VOLATILE); + /* + * Decide whether to report the error upwards or defer it. + */ + + if (calledFromAsyncFlush) { + /* + * TIP #219, Tcl Channel Reflection API. + * When defering the error copy a message from the bypass into + * the unreported area. Or discard it if the new error is to be + * ignored in favor of an earlier defered error. + */ + + Tcl_Obj *msg = statePtr->chanMsg; + + if (statePtr->unreportedError == 0) { + statePtr->unreportedError = errorCode; + statePtr->unreportedMsg = msg; + if (msg != NULL) { + Tcl_IncrRefCount(msg); + } + } else { + /* + * An old unreported error is kept, and this error thrown + * away. + */ + + statePtr->chanMsg = NULL; + if (msg != NULL) { + TclDecrRefCount(msg); + } + } + } else { + /* + * TIP #219, Tcl Channel Reflection API. + * Move error messages put by the driver into the chan bypass + * area into the regular interpreter result. Fall back to the + * regular message if nothing was found in the bypasses. + */ + + Tcl_SetErrno(errorCode); + if (interp != NULL && !TclChanCaughtErrorBypass(interp, + (Tcl_Channel) chanPtr)) { + Tcl_SetObjResult(interp, + Tcl_NewStringObj(Tcl_PosixError(interp), -1)); } - } - /* - * When we get an error we throw away all the output - * currently queued. - */ + /* + * An unreportable bypassed message is kept, for the caller of + * Tcl_Seek, Tcl_Write, etc. + */ + } - DiscardOutputQueued(chanPtr); - continue; - } else { + /* + * When we get an error we throw away all the output currently + * queued. + */ + + DiscardOutputQueued(statePtr); + continue; + } else { wroteSome = 1; } - bufPtr->nextRemoved += written; + if (!IsBufferEmpty(bufPtr)) { + bufPtr->nextRemoved += written; + } - /* - * If this buffer is now empty, recycle it. - */ + /* + * If this buffer is now empty, recycle it. + */ - if (bufPtr->nextRemoved == bufPtr->nextAdded) { - chanPtr->outQueueHead = bufPtr->nextPtr; - if (chanPtr->outQueueHead == (ChannelBuffer *) NULL) { - chanPtr->outQueueTail = (ChannelBuffer *) NULL; - } - RecycleBuffer(chanPtr, bufPtr, 0); - } + if (IsBufferEmpty(bufPtr)) { + statePtr->outQueueHead = bufPtr->nextPtr; + if (statePtr->outQueueHead == NULL) { + statePtr->outQueueTail = NULL; + } + RecycleBuffer(statePtr, bufPtr, 0); + } + ReleaseChannelBuffer(bufPtr); } /* Closes "while (1)". */ /* * If we wrote some data while flushing in the background, we are done. - * We can't finish the background flush until we run out of data and - * the channel becomes writable again. This ensures that all of the - * pending data has been flushed at the system level. + * We can't finish the background flush until we run out of data and the + * channel becomes writable again. This ensures that all of the pending + * data has been flushed at the system level. */ - if (chanPtr->flags & BG_FLUSH_SCHEDULED) { + if (GotFlag(statePtr, BG_FLUSH_SCHEDULED)) { if (wroteSome) { - return errorCode; - } else if (chanPtr->outQueueHead == (ChannelBuffer *) NULL) { - chanPtr->flags &= (~(BG_FLUSH_SCHEDULED)); - (chanPtr->typePtr->watchProc)(chanPtr->instanceData, - chanPtr->interestMask); + goto done; + } else if (statePtr->outQueueHead == NULL) { + ResetFlag(statePtr, BG_FLUSH_SCHEDULED); + ChanWatch(chanPtr, statePtr->interestMask); } } /* - * If the channel is flagged as closed, delete it when the refCount - * drops to zero, the output queue is empty and there is no output - * in the current output buffer. + * If the channel is flagged as closed, delete it when the refCount drops + * to zero, the output queue is empty and there is no output in the + * current output buffer. + */ + + if (GotFlag(statePtr, CHANNEL_CLOSED) && (statePtr->refCount <= 0) && + (statePtr->outQueueHead == NULL) && + ((statePtr->curOutPtr == NULL) || + IsBufferEmpty(statePtr->curOutPtr))) { + errorCode = CloseChannel(interp, chanPtr, errorCode); + goto done; + } + + /* + * If the write-side of the channel is flagged as closed, delete it when + * the output queue is empty and there is no output in the current output + * buffer. */ - if ((chanPtr->flags & CHANNEL_CLOSED) && (chanPtr->refCount <= 0) && - (chanPtr->outQueueHead == (ChannelBuffer *) NULL) && - ((chanPtr->curOutPtr == (ChannelBuffer *) NULL) || - (chanPtr->curOutPtr->nextAdded == - chanPtr->curOutPtr->nextRemoved))) { - return CloseChannel(interp, chanPtr, errorCode); + if (GotFlag(statePtr, CHANNEL_CLOSEDWRITE) && + (statePtr->outQueueHead == NULL) && + ((statePtr->curOutPtr == NULL) || + IsBufferEmpty(statePtr->curOutPtr))) { + errorCode = CloseChannelPart(interp, chanPtr, errorCode, TCL_CLOSE_WRITE); + goto done; } + + done: + Tcl_Release(chanPtr); return errorCode; } @@ -2415,184 +2768,180 @@ FlushChannel(interp, chanPtr, calledFromAsyncFlush) * * CloseChannel -- * - * Utility procedure to close a channel and free its associated - * resources. + * Utility procedure to close a channel and free associated resources. + * + * If the channel was stacked, then the it will copy the necessary + * elements of the NEXT channel into the TOP channel, in essence + * unstacking the channel. The NEXT channel will then be freed. + * + * If the channel was not stacked, then we will free all the bits for the + * TOP channel, including the data structure itself. * * Results: - * 0 on success or a POSIX error code if the operation failed. + * Error code from an unreported error or the driver close operation. * * Side effects: - * May close the actual channel; may free memory. + * May close the actual channel, may free memory, may change the value of + * errno. * *---------------------------------------------------------------------- */ static int -CloseChannel(interp, chanPtr, errorCode) - Tcl_Interp *interp; /* For error reporting. */ - Channel *chanPtr; /* The channel to close. */ - int errorCode; /* Status of operation so far. */ -{ - int result = 0; /* Of calling driver close - * operation. */ - Channel *prevChanPtr; /* Preceding channel in list of - * all channels - used to splice a - * channel out of the list on close. */ +CloseChannel( + Tcl_Interp *interp, /* For error reporting. */ + Channel *chanPtr, /* The channel to close. */ + int errorCode) /* Status of operation so far. */ +{ + int result = 0; /* Of calling driver close operation. */ + ChannelState *statePtr; /* State of the channel stack. */ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); if (chanPtr == NULL) { - return result; + return result; } - + statePtr = chanPtr->state; + /* * No more input can be consumed so discard any leftover input. */ - DiscardInputQueued(chanPtr, 1); + DiscardInputQueued(statePtr, 1); /* * Discard a leftover buffer in the current output buffer field. */ - if (chanPtr->curOutPtr != (ChannelBuffer *) NULL) { - ckfree((char *) chanPtr->curOutPtr); - chanPtr->curOutPtr = (ChannelBuffer *) NULL; + if (statePtr->curOutPtr != NULL) { + ReleaseChannelBuffer(statePtr->curOutPtr); + statePtr->curOutPtr = NULL; } - + /* - * The caller guarantees that there are no more buffers - * queued for output. + * The caller guarantees that there are no more buffers queued for output. */ - if (chanPtr->outQueueHead != (ChannelBuffer *) NULL) { - panic("TclFlush, closed channel: queued output left"); + if (statePtr->outQueueHead != NULL) { + Tcl_Panic("TclFlush, closed channel: queued output left"); } /* - * If the EOF character is set in the channel, append that to the - * output device. + * If the EOF character is set in the channel, append that to the output + * device. */ - if ((chanPtr->outEofChar != 0) && (chanPtr->flags & TCL_WRITABLE)) { - int dummy; - char c; + if ((statePtr->outEofChar != 0) && GotFlag(statePtr, TCL_WRITABLE)) { + int dummy; + char c = (char) statePtr->outEofChar; - c = (char) chanPtr->outEofChar; - (chanPtr->typePtr->outputProc) (chanPtr->instanceData, &c, 1, &dummy); + (void) ChanWrite(chanPtr, &c, 1, &dummy); } /* - * Remove TCL_READABLE and TCL_WRITABLE from chanPtr->flags, so - * that close callbacks can not do input or output (assuming they - * squirreled the channel away in their clientData). This also - * prevents infinite loops if the callback calls any C API that - * could call FlushChannel. + * TIP #219, Tcl Channel Reflection API. + * Move a leftover error message in the channel bypass into the + * interpreter bypass. Just clear it if there is no interpreter. */ - chanPtr->flags &= (~(TCL_READABLE|TCL_WRITABLE)); - + if (statePtr->chanMsg != NULL) { + if (interp != NULL) { + Tcl_SetChannelErrorInterp(interp, statePtr->chanMsg); + } + TclDecrRefCount(statePtr->chanMsg); + statePtr->chanMsg = NULL; + } + /* - * Splice this channel out of the list of all channels. + * Remove this channel from of the list of all channels. */ - if (chanPtr == tsdPtr->firstChanPtr) { - tsdPtr->firstChanPtr = chanPtr->nextChanPtr; - } else { - for (prevChanPtr = tsdPtr->firstChanPtr; - (prevChanPtr != (Channel *) NULL) && - (prevChanPtr->nextChanPtr != chanPtr); - prevChanPtr = prevChanPtr->nextChanPtr) { - /* Empty loop body. */ - } - if (prevChanPtr == (Channel *) NULL) { - panic("FlushChannel: damaged channel list"); - } - prevChanPtr->nextChanPtr = chanPtr->nextChanPtr; - } + CutChannel((Tcl_Channel) chanPtr); /* * Close and free the channel driver state. + * This may leave a TIP #219 error message in the interp. */ - - if (chanPtr->typePtr->closeProc != TCL_CLOSE2PROC) { - result = (chanPtr->typePtr->closeProc)(chanPtr->instanceData, interp); - } else { - result = (chanPtr->typePtr->close2Proc)(chanPtr->instanceData, interp, - 0); - } - - if (chanPtr->channelName != (char *) NULL) { - ckfree(chanPtr->channelName); - } - Tcl_FreeEncoding(chanPtr->encoding); - if (chanPtr->outputStage != NULL) { - ckfree((char *) chanPtr->outputStage); - } - + + result = ChanClose(chanPtr, interp); + /* - * If we are being called synchronously, report either - * any latent error on the channel or the current error. + * Some resources can be cleared only if the bottom channel in a stack is + * closed. All the other channels in the stack are not allowed to remove. */ - - if (chanPtr->unreportedError != 0) { - errorCode = chanPtr->unreportedError; - } - if (errorCode == 0) { - errorCode = result; - if (errorCode != 0) { - Tcl_SetErrno(errorCode); - } + + if (chanPtr == statePtr->bottomChanPtr) { + if (statePtr->channelName != NULL) { + ckfree(statePtr->channelName); + statePtr->channelName = NULL; + } + + Tcl_FreeEncoding(statePtr->encoding); } - /* Andreas Kupries <a.kupries@westend.com>, 12/13/1998 - * "Trf-Patch for filtering channels" - * - * This is the change to 'CloseChannel'. - * - * Explanation - * Closing a filtering channel closes the one it - * superceded too. This basically ripples through - * the whole chain of filters until it reaches - * the underlying normal channel. - * - * This is done by reintegrating the superceded - * channel into the (thread) global list of open - * channels and then invoking a regular close. - * There is no need to handle the complexities of - * this process by ourselves. - * - * *Note* - * This has to be done after the call to the - * 'closeProc' of the filtering channel to allow - * that one to flush internal buffers into - * the underlying channel. + /* + * If we are being called synchronously, report either any latent error on + * the channel or the current error. */ - if (chanPtr->supercedes != (Channel*) NULL) { + if (statePtr->unreportedError != 0) { + errorCode = statePtr->unreportedError; + /* - * Insert the channel we were stacked upon back into - * the list of open channels, then do a regular close. + * TIP #219, Tcl Channel Reflection API. + * Move an error message found in the unreported area into the regular + * bypass (interp). This kills any message in the channel bypass area. */ - chanPtr->supercedes->nextChanPtr = tsdPtr->firstChanPtr; - tsdPtr->firstChanPtr = chanPtr->supercedes; - chanPtr->supercedes->refCount --; /* is deregistered */ - Tcl_Close (interp, (Tcl_Channel) chanPtr->supercedes); + if (statePtr->chanMsg != NULL) { + TclDecrRefCount(statePtr->chanMsg); + statePtr->chanMsg = NULL; + } + if (interp) { + Tcl_SetChannelErrorInterp(interp, statePtr->unreportedMsg); + } + } + if (errorCode == 0) { + errorCode = result; + if (errorCode != 0) { + Tcl_SetErrno(errorCode); + } } /* * Cancel any outstanding timer. */ - Tcl_DeleteTimerHandler(chanPtr->timer); + Tcl_DeleteTimerHandler(statePtr->timer); /* * Mark the channel as deleted by clearing the type structure. */ + if (chanPtr->downChanPtr != NULL) { + Channel *downChanPtr = chanPtr->downChanPtr; + + statePtr->nextCSPtr = tsdPtr->firstCSPtr; + tsdPtr->firstCSPtr = statePtr; + + statePtr->topChanPtr = downChanPtr; + downChanPtr->upChanPtr = NULL; + chanPtr->typePtr = NULL; + + Tcl_EventuallyFree(chanPtr, TCL_DYNAMIC); + return Tcl_Close(interp, (Tcl_Channel) downChanPtr); + } + + /* + * There is only the TOP Channel, so we free the remaining pointers we + * have and then ourselves. Since this is the last of the channels in the + * stack, make sure to free the ChannelState structure associated with it. + * We use Tcl_EventuallyFree to allow for any last references. + */ + chanPtr->typePtr = NULL; - Tcl_EventuallyFree((ClientData) chanPtr, TCL_DYNAMIC); + Tcl_EventuallyFree(statePtr, TCL_DYNAMIC); + Tcl_EventuallyFree(chanPtr, TCL_DYNAMIC); return errorCode; } @@ -2600,6 +2949,205 @@ CloseChannel(interp, chanPtr, errorCode) /* *---------------------------------------------------------------------- * + * Tcl_CutChannel -- + * CutChannel -- + * + * Removes a channel from the (thread-)global list of all channels (in + * that thread). This is actually the statePtr for the stack of channel. + * + * Results: + * Nothing. + * + * Side effects: + * Resets the field 'nextCSPtr' of the specified channel state to NULL. + * + * NOTE: + * The channel to cut out of the list must not be referenced in any + * interpreter. This is something this procedure cannot check (despite + * the refcount) because the caller usually wants fiddle with the channel + * (like transfering it to a different thread) and thus keeps the + * refcount artifically high to prevent its destruction. + * + *---------------------------------------------------------------------- + */ + +static void +CutChannel( + Tcl_Channel chan) /* The channel being removed. Must not be + * referenced in any interpreter. */ +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + ChannelState *prevCSPtr; /* Preceding channel state in list of all + * states - used to splice a channel out of + * the list on close. */ + ChannelState *statePtr = ((Channel *) chan)->state; + /* State of the channel stack. */ + + /* + * Remove this channel from of the list of all channels (in the current + * thread). + */ + + if (tsdPtr->firstCSPtr && (statePtr == tsdPtr->firstCSPtr)) { + tsdPtr->firstCSPtr = statePtr->nextCSPtr; + } else { + for (prevCSPtr = tsdPtr->firstCSPtr; + prevCSPtr && (prevCSPtr->nextCSPtr != statePtr); + prevCSPtr = prevCSPtr->nextCSPtr) { + /* Empty loop body. */ + } + if (prevCSPtr == NULL) { + Tcl_Panic("FlushChannel: damaged channel list"); + } + prevCSPtr->nextCSPtr = statePtr->nextCSPtr; + } + + statePtr->nextCSPtr = NULL; + + /* + * TIP #218, Channel Thread Actions + */ + + ChanThreadAction((Channel *) chan, TCL_CHANNEL_THREAD_REMOVE); +} + +void +Tcl_CutChannel( + Tcl_Channel chan) /* The channel being added. Must not be + * referenced in any interpreter. */ +{ + Channel *chanPtr = ((Channel *) chan)->state->bottomChanPtr; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + ChannelState *prevCSPtr; /* Preceding channel state in list of all + * states - used to splice a channel out of + * the list on close. */ + ChannelState *statePtr = chanPtr->state; + /* State of the channel stack. */ + + /* + * Remove this channel from of the list of all channels (in the current + * thread). + */ + + if (tsdPtr->firstCSPtr && (statePtr == tsdPtr->firstCSPtr)) { + tsdPtr->firstCSPtr = statePtr->nextCSPtr; + } else { + for (prevCSPtr = tsdPtr->firstCSPtr; + prevCSPtr && (prevCSPtr->nextCSPtr != statePtr); + prevCSPtr = prevCSPtr->nextCSPtr) { + /* Empty loop body. */ + } + if (prevCSPtr == NULL) { + Tcl_Panic("FlushChannel: damaged channel list"); + } + prevCSPtr->nextCSPtr = statePtr->nextCSPtr; + } + + statePtr->nextCSPtr = NULL; + + /* + * TIP #218, Channel Thread Actions + * For all transformations and the base channel. + */ + + for (; chanPtr != NULL ; chanPtr = chanPtr->upChanPtr) { + ChanThreadAction(chanPtr, TCL_CHANNEL_THREAD_REMOVE); + } +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_SpliceChannel -- + * SpliceChannel -- + * + * Adds a channel to the (thread-)global list of all channels (in that + * thread). Expects that the field 'nextChanPtr' in the channel is set to + * NULL. + * + * Results: + * Nothing. + * + * Side effects: + * Nothing. + * + * NOTE: + * The channel to splice into the list must not be referenced in any + * interpreter. This is something this procedure cannot check (despite + * the refcount) because the caller usually wants figgle with the channel + * (like transfering it to a different thread) and thus keeps the + * refcount artifically high to prevent its destruction. + * + *---------------------------------------------------------------------- + */ + +static void +SpliceChannel( + Tcl_Channel chan) /* The channel being added. Must not be + * referenced in any interpreter. */ +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + ChannelState *statePtr = ((Channel *) chan)->state; + + if (statePtr->nextCSPtr != NULL) { + Tcl_Panic("SpliceChannel: trying to add channel used in different list"); + } + + statePtr->nextCSPtr = tsdPtr->firstCSPtr; + tsdPtr->firstCSPtr = statePtr; + + /* + * TIP #10. Mark the current thread as the new one managing this channel. + * Note: 'Tcl_GetCurrentThread' returns sensible values even for + * a non-threaded core. + */ + + statePtr->managingThread = Tcl_GetCurrentThread(); + + /* + * TIP #218, Channel Thread Actions + */ + + ChanThreadAction((Channel *) chan, TCL_CHANNEL_THREAD_INSERT); +} + +void +Tcl_SpliceChannel( + Tcl_Channel chan) /* The channel being added. Must not be + * referenced in any interpreter. */ +{ + Channel *chanPtr = ((Channel *) chan)->state->bottomChanPtr; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + ChannelState *statePtr = chanPtr->state; + + if (statePtr->nextCSPtr != NULL) { + Tcl_Panic("SpliceChannel: trying to add channel used in different list"); + } + + statePtr->nextCSPtr = tsdPtr->firstCSPtr; + tsdPtr->firstCSPtr = statePtr; + + /* + * TIP #10. Mark the current thread as the new one managing this channel. + * Note: 'Tcl_GetCurrentThread' returns sensible values even for + * a non-threaded core. + */ + + statePtr->managingThread = Tcl_GetCurrentThread(); + + /* + * TIP #218, Channel Thread Actions + * For all transformations and the base channel. + */ + + for (; chanPtr != NULL ; chanPtr = chanPtr->upChanPtr) { + ChanThreadAction(chanPtr, TCL_CHANNEL_THREAD_INSERT); + } +} + +/* + *---------------------------------------------------------------------- + * * Tcl_Close -- * * Closes a channel. @@ -2612,34 +3160,32 @@ CloseChannel(interp, chanPtr, errorCode) * * NOTE: * Tcl_Close removes the channel as far as the user is concerned. - * However, it may continue to exist for a while longer if it has - * a background flush scheduled. The device itself is eventually - * closed and the channel record removed, in CloseChannel, above. + * However, it may continue to exist for a while longer if it has a + * background flush scheduled. The device itself is eventually closed and + * the channel record removed, in CloseChannel, above. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int -Tcl_Close(interp, chan) - Tcl_Interp *interp; /* Interpreter for errors. */ - Tcl_Channel chan; /* The channel being closed. Must - * not be referenced in any - * interpreter. */ +Tcl_Close( + Tcl_Interp *interp, /* Interpreter for errors. */ + Tcl_Channel chan) /* The channel being closed. Must not be + * referenced in any interpreter. */ { - ChannelHandler *chPtr, *chNext; /* Iterate over channel handlers. */ - CloseCallback *cbPtr; /* Iterate over close callbacks - * for this channel. */ - EventScriptRecord *ePtr, *eNextPtr; /* Iterate over eventscript records. */ - Channel *chanPtr; /* The real IO channel. */ - int result; /* Of calling FlushChannel. */ - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - NextChannelHandler *nhPtr; + CloseCallback *cbPtr; /* Iterate over close callbacks for this + * channel. */ + Channel *chanPtr; /* The real IO channel. */ + ChannelState *statePtr; /* State of real IO channel. */ + int result; /* Of calling FlushChannel. */ + int flushcode; + int stickyError; - if (chan == (Tcl_Channel) NULL) { - return TCL_OK; + if (chan == NULL) { + return TCL_OK; } - + /* * Perform special handling for standard channels being closed. If the * refCount is now 1 it means that the last reference to the standard @@ -2650,121 +3196,597 @@ Tcl_Close(interp, chan) CheckForStdChannelsBeingClosed(chan); + /* + * This operation should occur at the top of a channel stack. + */ + chanPtr = (Channel *) chan; - if (chanPtr->refCount > 0) { - panic("called Tcl_Close on channel with refCount > 0"); + statePtr = chanPtr->state; + chanPtr = statePtr->topChanPtr; + + if (statePtr->refCount > 0) { + Tcl_Panic("called Tcl_Close on channel with refCount > 0"); + } + + if (GotFlag(statePtr, CHANNEL_INCLOSE)) { + if (interp) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "illegal recursive call to close through close-handler" + " of channel", -1)); + } + return TCL_ERROR; } + SetFlag(statePtr, CHANNEL_INCLOSE); /* - * Remove any references to channel handlers for this channel that - * may be about to be invoked. + * When the channel has an escape sequence driven encoding such as + * iso2022, the terminated escape sequence must write to the buffer. */ - for (nhPtr = tsdPtr->nestedHandlerPtr; - nhPtr != (NextChannelHandler *) NULL; - nhPtr = nhPtr->nestedHandlerPtr) { - if (nhPtr->nextHandlerPtr && - (nhPtr->nextHandlerPtr->chanPtr == chanPtr)) { - nhPtr->nextHandlerPtr = NULL; - } + stickyError = 0; + + if ((statePtr->encoding != NULL) + && !(statePtr->outputEncodingFlags & TCL_ENCODING_START) + && (CheckChannelErrors(statePtr, TCL_WRITABLE) == 0)) { + statePtr->outputEncodingFlags |= TCL_ENCODING_END; + if (WriteChars(chanPtr, "", 0) < 0) { + stickyError = Tcl_GetErrno(); + } + + /* + * TIP #219, Tcl Channel Reflection API. + * Move an error message found in the channel bypass into the + * interpreter bypass. Just clear it if there is no interpreter. + */ + + if (statePtr->chanMsg != NULL) { + if (interp != NULL) { + Tcl_SetChannelErrorInterp(interp, statePtr->chanMsg); + } + TclDecrRefCount(statePtr->chanMsg); + statePtr->chanMsg = NULL; + } } + Tcl_ClearChannelHandlers(chan); + /* - * Remove all the channel handler records attached to the channel - * itself. + * Invoke the registered close callbacks and delete their records. */ - - for (chPtr = chanPtr->chPtr; - chPtr != (ChannelHandler *) NULL; - chPtr = chNext) { - chNext = chPtr->nextPtr; - ckfree((char *) chPtr); + + while (statePtr->closeCbPtr != NULL) { + cbPtr = statePtr->closeCbPtr; + statePtr->closeCbPtr = cbPtr->nextPtr; + cbPtr->proc(cbPtr->clientData); + ckfree(cbPtr); } - chanPtr->chPtr = (ChannelHandler *) NULL; - - + + ResetFlag(statePtr, CHANNEL_INCLOSE); + /* - * Cancel any pending copy operation. + * Ensure that the last output buffer will be flushed. */ - StopCopy(chanPtr->csPtr); + if ((statePtr->curOutPtr != NULL) && IsBufferReady(statePtr->curOutPtr)) { + SetFlag(statePtr, BUFFER_READY); + } /* - * Must set the interest mask now to 0, otherwise infinite loops - * will occur if Tcl_DoOneEvent is called before the channel is - * finally deleted in FlushChannel. This can happen if the channel - * has a background flush active. + * If this channel supports it, close the read side, since we don't need + * it anymore and this will help avoid deadlocks on some channel types. */ - - chanPtr->interestMask = 0; - + + if (chanPtr->typePtr->closeProc == TCL_CLOSE2PROC) { + result = chanPtr->typePtr->close2Proc(chanPtr->instanceData, interp, + TCL_CLOSE_READ); + } else { + result = 0; + } + /* - * Remove any EventScript records for this channel. + * The call to FlushChannel will flush any queued output and invoke the + * close function of the channel driver, or it will set up the channel to + * be flushed and closed asynchronously. + */ + + SetFlag(statePtr, CHANNEL_CLOSED); + + flushcode = FlushChannel(interp, chanPtr, 0); + + /* + * TIP #219. + * Capture error messages put by the driver into the bypass area and put + * them into the regular interpreter result. + * + * Notes: Due to the assertion of CHANNEL_CLOSED in the flags + * FlushChannel() has called CloseChannel() and thus freed all the channel + * structures. We must not try to access "chan" anymore, hence the NULL + * argument in the call below. The only place which may still contain a + * message is the interpreter itself, and "CloseChannel" made sure to lift + * any channel message it generated into it. */ - for (ePtr = chanPtr->scriptRecordPtr; - ePtr != (EventScriptRecord *) NULL; - ePtr = eNextPtr) { - eNextPtr = ePtr->nextPtr; - Tcl_DecrRefCount(ePtr->scriptPtr); - ckfree((char *) ePtr); + if (TclChanCaughtErrorBypass(interp, NULL)) { + result = EINVAL; + } + + if (stickyError != 0) { + Tcl_SetErrno(stickyError); + if (interp != NULL) { + Tcl_SetObjResult(interp, + Tcl_NewStringObj(Tcl_PosixError(interp), -1)); + } + return TCL_ERROR; } - chanPtr->scriptRecordPtr = (EventScriptRecord *) NULL; - /* - * Invoke the registered close callbacks and delete their records. + * Bug 97069ea11a: set error message if a flush code is set and no error + * message set up to now. + */ + if (flushcode != 0 && interp != NULL + && 0 == Tcl_GetCharLength(Tcl_GetObjResult(interp)) ) { + Tcl_SetErrno(flushcode); + Tcl_SetObjResult(interp, + Tcl_NewStringObj(Tcl_PosixError(interp), -1)); + } + if ((flushcode != 0) || (result != 0)) { + return TCL_ERROR; + } + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_CloseEx -- + * + * Closes one side of a channel, read or write. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * Closes one direction of the channel. + * + * NOTE: + * Tcl_CloseEx closes the specified direction of the channel as far as + * the user is concerned. The channel keeps existing however. You cannot + * calls this function to close the last possible direction of the + * channel. Use Tcl_Close for that. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +int +Tcl_CloseEx( + Tcl_Interp *interp, /* Interpreter for errors. */ + Tcl_Channel chan, /* The channel being closed. May still be used + * by some interpreter. */ + int flags) /* Flags telling us which side to close. */ +{ + Channel *chanPtr; /* The real IO channel. */ + ChannelState *statePtr; /* State of real IO channel. */ + + if (chan == NULL) { + return TCL_OK; + } + + /* TODO: assert flags validity ? */ + + chanPtr = (Channel *) chan; + statePtr = chanPtr->state; + + /* + * Does the channel support half-close anyway? Error if not. + */ + + if (!chanPtr->typePtr->close2Proc) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "half-close of channels not supported by %ss", + chanPtr->typePtr->typeName)); + return TCL_ERROR; + } + + /* + * Is the channel unstacked ? If not we fail. + */ + + if (chanPtr != statePtr->topChanPtr) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "half-close not applicable to stack of transformations", -1)); + return TCL_ERROR; + } + + /* + * Check direction against channel mode. It is an error if we try to close + * a direction not supported by the channel (already closed, or never + * opened for that direction). + */ + + if (!(statePtr->flags & (TCL_READABLE | TCL_WRITABLE) & flags)) { + const char *msg; + + if (flags & TCL_CLOSE_READ) { + msg = "read"; + } else { + msg = "write"; + } + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "Half-close of %s-side not possible, side not opened or" + " already closed", msg)); + return TCL_ERROR; + } + + /* + * A user may try to call half-close from within a channel close + * handler. That won't do. */ - while (chanPtr->closeCbPtr != (CloseCallback *) NULL) { - cbPtr = chanPtr->closeCbPtr; - chanPtr->closeCbPtr = cbPtr->nextPtr; - (cbPtr->proc) (cbPtr->clientData); - ckfree((char *) cbPtr); + if (statePtr->flags & CHANNEL_INCLOSE) { + if (interp) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "illegal recursive call to close through close-handler" + " of channel", -1)); + } + return TCL_ERROR; } + if (flags & TCL_CLOSE_READ) { + /* + * Call the finalization code directly. There are no events to handle, + * there cannot be for the read-side. + */ + + return CloseChannelPart(interp, chanPtr, 0, flags); + } else if (flags & TCL_CLOSE_WRITE) { + if ((statePtr->curOutPtr != NULL) && + IsBufferReady(statePtr->curOutPtr)) { + SetFlag(statePtr, BUFFER_READY); + } + Tcl_Preserve(statePtr); + if (!GotFlag(statePtr, BG_FLUSH_SCHEDULED)) { + /* + * We don't want to re-enter CloseWrite(). + */ + + if (!GotFlag(statePtr, CHANNEL_CLOSEDWRITE)) { + if (CloseWrite(interp, chanPtr) != TCL_OK) { + SetFlag(statePtr, CHANNEL_CLOSEDWRITE); + Tcl_Release(statePtr); + return TCL_ERROR; + } + } + } + SetFlag(statePtr, CHANNEL_CLOSEDWRITE); + Tcl_Release(statePtr); + } + + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * CloseWrite -- + * + * Closes the write side a channel. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * Closes the write side of the channel. + * + * NOTE: + * CloseWrite removes the channel as far as the user is concerned. + * However, the ooutput data structures may continue to exist for a while + * longer if it has a background flush scheduled. The device itself is + * eventually closed and the channel structures modified, in + * CloseChannelPart, below. + * + *---------------------------------------------------------------------- + */ + +static int +CloseWrite( + Tcl_Interp *interp, /* Interpreter for errors. */ + Channel *chanPtr) /* The channel whose write side is being + * closed. May still be used by some + * interpreter */ +{ + /* Notes: clear-channel-handlers - write side only ? or keep around, just + * not called. */ + /* No close cllbacks are run - channel is still open (read side) */ + + ChannelState *statePtr = chanPtr->state; + /* State of real IO channel. */ + int flushcode; + int result = 0; + /* * Ensure that the last output buffer will be flushed. */ - - if ((chanPtr->curOutPtr != (ChannelBuffer *) NULL) && - (chanPtr->curOutPtr->nextAdded > chanPtr->curOutPtr->nextRemoved)) { - chanPtr->flags |= BUFFER_READY; + + if ((statePtr->curOutPtr != NULL) && IsBufferReady(statePtr->curOutPtr)) { + SetFlag(statePtr, BUFFER_READY); } /* - * If this channel supports it, close the read side, since we don't need it - * anymore and this will help avoid deadlocks on some channel types. + * The call to FlushChannel will flush any queued output and invoke the + * close function of the channel driver, or it will set up the channel to + * be flushed and closed asynchronously. */ - if (chanPtr->typePtr->closeProc == TCL_CLOSE2PROC) { - result = (chanPtr->typePtr->close2Proc)(chanPtr->instanceData, interp, - TCL_CLOSE_READ); - } else { - result = 0; + SetFlag(statePtr, CHANNEL_CLOSEDWRITE); + + flushcode = FlushChannel(interp, chanPtr, 0); + + /* + * TIP #219. + * Capture error messages put by the driver into the bypass area and put + * them into the regular interpreter result. + * + * Notes: Due to the assertion of CHANNEL_CLOSEDWRITE in the flags + * FlushChannel() has called CloseChannelPart(). While we can still access + * "chan" (no structures were freed), the only place which may still + * contain a message is the interpreter itself, and "CloseChannelPart" made + * sure to lift any channel message it generated into it. Hence the NULL + * argument in the call below. + */ + + if (TclChanCaughtErrorBypass(interp, NULL)) { + result = EINVAL; + } + + if ((flushcode != 0) || (result != 0)) { + return TCL_ERROR; + } + + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * CloseChannelPart -- + * + * Utility procedure to close a channel partially and free associated + * resources. If the channel was stacked it will never be run (The higher + * level forbid this). If the channel was not stacked, then we will free + * all the bits of the chosen side (read, or write) for the TOP channel. + * + * Results: + * Error code from an unreported error or the driver close2 operation. + * + * Side effects: + * May free memory, may change the value of errno. + * + *---------------------------------------------------------------------- + */ + +static int +CloseChannelPart( + Tcl_Interp *interp, /* Interpreter for errors. */ + Channel *chanPtr, /* The channel being closed. May still be used + * by some interpreter. */ + int errorCode, /* Status of operation so far. */ + int flags) /* Flags telling us which side to close. */ +{ + ChannelState *statePtr; /* State of real IO channel. */ + int result; /* Of calling the close2proc. */ + + statePtr = chanPtr->state; + + if (flags & TCL_CLOSE_READ) { + /* + * No more input can be consumed so discard any leftover input. + */ + + DiscardInputQueued(statePtr, 1); + } else if (flags & TCL_CLOSE_WRITE) { + /* + * The caller guarantees that there are no more buffers queued for + * output. + */ + + if (statePtr->outQueueHead != NULL) { + Tcl_Panic("ClosechanHalf, closed write-side of channel: " + "queued output left"); + } + + /* + * If the EOF character is set in the channel, append that to the + * output device. + */ + + if ((statePtr->outEofChar != 0) && GotFlag(statePtr, TCL_WRITABLE)) { + int dummy; + char c = (char) statePtr->outEofChar; + + (void) ChanWrite(chanPtr, &c, 1, &dummy); + } + + /* + * TIP #219, Tcl Channel Reflection API. + * Move a leftover error message in the channel bypass into the + * interpreter bypass. Just clear it if there is no interpreter. + */ + + if (statePtr->chanMsg != NULL) { + if (interp != NULL) { + Tcl_SetChannelErrorInterp(interp, statePtr->chanMsg); + } + TclDecrRefCount(statePtr->chanMsg); + statePtr->chanMsg = NULL; + } } /* - * The call to FlushChannel will flush any queued output and invoke - * the close function of the channel driver, or it will set up the - * channel to be flushed and closed asynchronously. + * Finally do what is asked of us. Close and free the channel driver state + * for the chosen side of the channel. This may leave a TIP #219 error + * message in the interp. */ - chanPtr->flags |= CHANNEL_CLOSED; - if ((FlushChannel(interp, chanPtr, 0) != 0) || (result != 0)) { - return TCL_ERROR; + result = ChanCloseHalf(chanPtr, interp, flags); + + /* + * If we are being called synchronously, report either any latent error on + * the channel or the current error. + */ + + if (statePtr->unreportedError != 0) { + errorCode = statePtr->unreportedError; + + /* + * TIP #219, Tcl Channel Reflection API. + * Move an error message found in the unreported area into the regular + * bypass (interp). This kills any message in the channel bypass area. + */ + + if (statePtr->chanMsg != NULL) { + TclDecrRefCount(statePtr->chanMsg); + statePtr->chanMsg = NULL; + } + if (interp) { + Tcl_SetChannelErrorInterp(interp, statePtr->unreportedMsg); + } + } + if (errorCode == 0) { + errorCode = result; + if (errorCode != 0) { + Tcl_SetErrno(errorCode); + } + } + + /* + * TIP #219. + * Capture error messages put by the driver into the bypass area and put + * them into the regular interpreter result. See also the bottom of + * CloseWrite(). + */ + + if (TclChanCaughtErrorBypass(interp, (Tcl_Channel) chanPtr)) { + result = EINVAL; } + + if (result != 0) { + return TCL_ERROR; + } + + /* + * Remove the closed side from the channel mode/flags. + */ + + ResetFlag(statePtr, flags & (TCL_READABLE | TCL_WRITABLE)); return TCL_OK; } /* *---------------------------------------------------------------------- * + * Tcl_ClearChannelHandlers -- + * + * Removes all channel handlers and event scripts from the channel, + * cancels all background copies involving the channel and any interest + * in events. + * + * Results: + * None. + * + * Side effects: + * See above. Deallocates memory. + * + *---------------------------------------------------------------------- + */ + +void +Tcl_ClearChannelHandlers( + Tcl_Channel channel) +{ + ChannelHandler *chPtr, *chNext; /* Iterate over channel handlers. */ + EventScriptRecord *ePtr, *eNextPtr; /* Iterate over eventscript records. */ + Channel *chanPtr; /* The real IO channel. */ + ChannelState *statePtr; /* State of real IO channel. */ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + NextChannelHandler *nhPtr; + + /* + * This operation should occur at the top of a channel stack. + */ + + chanPtr = (Channel *) channel; + statePtr = chanPtr->state; + chanPtr = statePtr->topChanPtr; + + /* + * Cancel any outstanding timer. + */ + + Tcl_DeleteTimerHandler(statePtr->timer); + + /* + * Remove any references to channel handlers for this channel that may be + * about to be invoked. + */ + + for (nhPtr = tsdPtr->nestedHandlerPtr; nhPtr != NULL; + nhPtr = nhPtr->nestedHandlerPtr) { + if (nhPtr->nextHandlerPtr && + (nhPtr->nextHandlerPtr->chanPtr == chanPtr)) { + nhPtr->nextHandlerPtr = NULL; + } + } + + /* + * Remove all the channel handler records attached to the channel itself. + */ + + for (chPtr = statePtr->chPtr; chPtr != NULL; chPtr = chNext) { + chNext = chPtr->nextPtr; + ckfree(chPtr); + } + statePtr->chPtr = NULL; + + /* + * Cancel any pending copy operation. + */ + + StopCopy(statePtr->csPtrR); + StopCopy(statePtr->csPtrW); + + /* + * Must set the interest mask now to 0, otherwise infinite loops + * will occur if Tcl_DoOneEvent is called before the channel is + * finally deleted in FlushChannel. This can happen if the channel + * has a background flush active. + */ + + statePtr->interestMask = 0; + + /* + * Remove any EventScript records for this channel. + */ + + for (ePtr = statePtr->scriptRecordPtr; ePtr != NULL; ePtr = eNextPtr) { + eNextPtr = ePtr->nextPtr; + TclDecrRefCount(ePtr->scriptPtr); + ckfree(ePtr); + } + statePtr->scriptRecordPtr = NULL; +} + +/* + *---------------------------------------------------------------------- + * * Tcl_Write -- * - * Puts a sequence of bytes into an output buffer, may queue the - * buffer for output if it gets full, and also remembers whether the - * current buffer is ready e.g. if it contains a newline and we are in - * line buffering mode. + * Puts a sequence of bytes into an output buffer, may queue the buffer + * for output if it gets full, and also remembers whether the current + * buffer is ready e.g. if it contains a newline and we are in line + * buffering mode. Compensates stacking, i.e. will redirect the data from + * the specified channel to the topmost channel in a stack. + * + * No encoding conversions are applied to the bytes being read. * * Results: * The number of bytes written or -1 in case of error. If -1, @@ -2778,34 +3800,44 @@ Tcl_Close(interp, chan) */ int -Tcl_Write(chan, src, srcLen) - Tcl_Channel chan; /* The channel to buffer output for. */ - char *src; /* Data to queue in output buffer. */ - int srcLen; /* Length of data in bytes, or < 0 for - * strlen(). */ +Tcl_Write( + Tcl_Channel chan, /* The channel to buffer output for. */ + const char *src, /* Data to queue in output buffer. */ + int srcLen) /* Length of data in bytes, or < 0 for + * strlen(). */ { + /* + * Always use the topmost channel of the stack + */ + Channel *chanPtr; + ChannelState *statePtr; /* State info for channel */ - chanPtr = (Channel *) chan; - if (CheckChannelErrors(chanPtr, TCL_WRITABLE) != 0) { + statePtr = ((Channel *) chan)->state; + chanPtr = statePtr->topChanPtr; + + if (CheckChannelErrors(statePtr, TCL_WRITABLE) != 0) { return -1; } + if (srcLen < 0) { - srcLen = strlen(src); + srcLen = strlen(src); } - return DoWrite(chanPtr, src, srcLen); + return WriteBytes(chanPtr, src, srcLen); } /* - *--------------------------------------------------------------------------- + *---------------------------------------------------------------------- * - * Tcl_WriteChars -- + * Tcl_WriteRaw -- * - * Takes a sequence of UTF-8 characters and converts them for output - * using the channel's current encoding, may queue the buffer for - * output if it gets full, and also remembers whether the current - * buffer is ready e.g. if it contains a newline and we are in - * line buffering mode. + * Puts a sequence of bytes into an output buffer, may queue the buffer + * for output if it gets full, and also remembers whether the current + * buffer is ready e.g. if it contains a newline and we are in line + * buffering mode. Writes directly to the driver of the channel, does not + * compensate for stacking. + * + * No encoding conversions are applied to the bytes being read. * * Results: * The number of bytes written or -1 in case of error. If -1, @@ -2819,56 +3851,53 @@ Tcl_Write(chan, src, srcLen) */ int -Tcl_WriteChars(chan, src, len) - Tcl_Channel chan; /* The channel to buffer output for. */ - CONST char *src; /* UTF-8 characters to queue in output buffer. */ - int len; /* Length of string in bytes, or < 0 for +Tcl_WriteRaw( + Tcl_Channel chan, /* The channel to buffer output for. */ + const char *src, /* Data to queue in output buffer. */ + int srcLen) /* Length of data in bytes, or < 0 for * strlen(). */ { - Channel *chanPtr; + Channel *chanPtr = ((Channel *) chan); + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ + int errorCode, written; - chanPtr = (Channel *) chan; - if (CheckChannelErrors(chanPtr, TCL_WRITABLE) != 0) { + if (CheckChannelErrors(statePtr, TCL_WRITABLE | CHANNEL_RAW_MODE) != 0) { return -1; } - if (len < 0) { - len = strlen(src); + + if (srcLen < 0) { + srcLen = strlen(src); } - if (chanPtr->encoding == NULL) { - /* - * Inefficient way to convert UTF-8 to byte-array, but the - * code parallels the way it is done for objects. - */ - Tcl_Obj *objPtr; - int result; + /* + * Go immediately to the driver, do all the error handling by ourselves. + * The code was stolen from 'FlushChannel'. + */ - objPtr = Tcl_NewStringObj(src, len); - src = (char *) Tcl_GetByteArrayFromObj(objPtr, &len); - result = WriteBytes(chanPtr, src, len); - Tcl_DecrRefCount(objPtr); - return result; + written = ChanWrite(chanPtr, src, srcLen, &errorCode); + if (written < 0) { + Tcl_SetErrno(errorCode); } - return WriteChars(chanPtr, src, len); + + return written; } /* *--------------------------------------------------------------------------- * - * Tcl_WriteObj -- + * Tcl_WriteChars -- * - * Takes the Tcl object and queues its contents for output. If the - * encoding of the channel is NULL, takes the byte-array representation - * of the object and queues those bytes for output. Otherwise, takes - * the characters in the UTF-8 (string) representation of the object - * and converts them for output using the channel's current encoding. - * May flush internal buffers to output if one becomes full or is ready - * for some other reason, e.g. if it contains a newline and the channel - * is in line buffering mode. + * Takes a sequence of UTF-8 characters and converts them for output + * using the channel's current encoding, may queue the buffer for output + * if it gets full, and also remembers whether the current buffer is + * ready e.g. if it contains a newline and we are in line buffering + * mode. Compensates stacking, i.e. will redirect the data from the + * specified channel to the topmost channel in a stack. * * Results: - * The number of bytes written or -1 in case of error. If -1, - * Tcl_GetErrno() will return the error code. + * The number of bytes written or -1 in case of error. If -1, + * Tcl_GetErrno will return the error code. * * Side effects: * May buffer up output and may cause output to be produced on the @@ -2878,40 +3907,66 @@ Tcl_WriteChars(chan, src, len) */ int -Tcl_WriteObj(chan, objPtr) - Tcl_Channel chan; /* The channel to buffer output for. */ - Tcl_Obj *objPtr; /* The object to write. */ +Tcl_WriteChars( + Tcl_Channel chan, /* The channel to buffer output for. */ + const char *src, /* UTF-8 characters to queue in output + * buffer. */ + int len) /* Length of string in bytes, or < 0 for + * strlen(). */ { - Channel *chanPtr; - char *src; - int srcLen; + Channel *chanPtr = (Channel *) chan; + ChannelState *statePtr = chanPtr->state; /* State info for channel */ + int result; + Tcl_Obj *objPtr; - chanPtr = (Channel *) chan; - if (CheckChannelErrors(chanPtr, TCL_WRITABLE) != 0) { + if (CheckChannelErrors(statePtr, TCL_WRITABLE) != 0) { return -1; } - if (chanPtr->encoding == NULL) { - src = (char *) Tcl_GetByteArrayFromObj(objPtr, &srcLen); - return WriteBytes(chanPtr, src, srcLen); - } else { - src = Tcl_GetStringFromObj(objPtr, &srcLen); - return WriteChars(chanPtr, src, srcLen); + + chanPtr = statePtr->topChanPtr; + + if (len < 0) { + len = strlen(src); } + if (statePtr->encoding) { + return WriteChars(chanPtr, src, len); + } + + /* + * Inefficient way to convert UTF-8 to byte-array, but the code + * parallels the way it is done for objects. Special case for 1-byte + * (used by eg [puts] for the \n) could be extended to more efficient + * translation of the src string. + */ + + if ((len == 1) && (UCHAR(*src) < 0xC0)) { + return WriteBytes(chanPtr, src, len); + } + + objPtr = Tcl_NewStringObj(src, len); + src = (char *) Tcl_GetByteArrayFromObj(objPtr, &len); + result = WriteBytes(chanPtr, src, len); + TclDecrRefCount(objPtr); + return result; } /* - *---------------------------------------------------------------------- + *--------------------------------------------------------------------------- * - * WriteBytes -- + * Tcl_WriteObj -- * - * Write a sequence of bytes into an output buffer, may queue the - * buffer for output if it gets full, and also remembers whether the - * current buffer is ready e.g. if it contains a newline and we are in + * Takes the Tcl object and queues its contents for output. If the + * encoding of the channel is NULL, takes the byte-array representation + * of the object and queues those bytes for output. Otherwise, takes the + * characters in the UTF-8 (string) representation of the object and + * converts them for output using the channel's current encoding. May + * flush internal buffers to output if one becomes full or is ready for + * some other reason, e.g. if it contains a newline and the channel is in * line buffering mode. * * Results: * The number of bytes written or -1 in case of error. If -1, - * Tcl_GetErrno will return the error code. + * Tcl_GetErrno() will return the error code. * * Side effects: * May buffer up output and may cause output to be produced on the @@ -2920,81 +3975,81 @@ Tcl_WriteObj(chan, objPtr) *---------------------------------------------------------------------- */ -static int -WriteBytes(chanPtr, src, srcLen) - Channel *chanPtr; /* The channel to buffer output for. */ - CONST char *src; /* Bytes to write. */ - int srcLen; /* Number of bytes to write. */ +int +Tcl_WriteObj( + Tcl_Channel chan, /* The channel to buffer output for. */ + Tcl_Obj *objPtr) /* The object to write. */ { - ChannelBuffer *bufPtr; - char *dst; - int dstLen, dstMax, sawLF, savedLF, total, toWrite; - - total = 0; - sawLF = 0; - savedLF = 0; - /* - * Loop over all bytes in src, storing them in output buffer with - * proper EOL translation. + * Always use the topmost channel of the stack */ - while (srcLen + savedLF > 0) { - bufPtr = chanPtr->curOutPtr; - if (bufPtr == NULL) { - bufPtr = AllocChannelBuffer(chanPtr->bufSize); - chanPtr->curOutPtr = bufPtr; - } - dst = bufPtr->buf + bufPtr->nextAdded; - dstMax = bufPtr->bufLength - bufPtr->nextAdded; - dstLen = dstMax; + Channel *chanPtr; + ChannelState *statePtr; /* State info for channel */ + const char *src; + int srcLen; - toWrite = dstLen; - if (toWrite > srcLen) { - toWrite = srcLen; - } + statePtr = ((Channel *) chan)->state; + chanPtr = statePtr->topChanPtr; - if (savedLF) { - /* - * A '\n' was left over from last call to TranslateOutputEOL() - * and we need to store it in this buffer. If the channel is - * line-based, we will need to flush it. - */ + if (CheckChannelErrors(statePtr, TCL_WRITABLE) != 0) { + return -1; + } + if (statePtr->encoding == NULL) { + src = (char *) Tcl_GetByteArrayFromObj(objPtr, &srcLen); + return WriteBytes(chanPtr, src, srcLen); + } else { + src = TclGetStringFromObj(objPtr, &srcLen); + return WriteChars(chanPtr, src, srcLen); + } +} + +static void +WillWrite( + Channel *chanPtr) +{ + int inputBuffered; - *dst++ = '\n'; - dstLen--; - sawLF++; - } - sawLF += TranslateOutputEOL(chanPtr, dst, src, &dstLen, &toWrite); - dstLen += savedLF; - savedLF = 0; + if ((chanPtr->typePtr->seekProc != NULL) && + ((inputBuffered = Tcl_InputBuffered((Tcl_Channel) chanPtr)) > 0)){ + int ignore; - if (dstLen > dstMax) { - savedLF = 1; - dstLen = dstMax; - } - bufPtr->nextAdded += dstLen; - if (CheckFlush(chanPtr, bufPtr, sawLF) != 0) { - return -1; - } - total += dstLen; - src += toWrite; - srcLen -= toWrite; - sawLF = 0; + DiscardInputQueued(chanPtr->state, 0); + ChanSeek(chanPtr, -inputBuffered, SEEK_CUR, &ignore); } - return total; +} + +static int +WillRead( + Channel *chanPtr) +{ + if (chanPtr->typePtr == NULL) { + /* Prevent read attempts on a closed channel */ + Tcl_SetErrno(EINVAL); + return -1; + } + if ((chanPtr->typePtr->seekProc != NULL) + && (Tcl_OutputBuffered((Tcl_Channel) chanPtr) > 0)) { + if ((chanPtr->state->curOutPtr != NULL) + && IsBufferReady(chanPtr->state->curOutPtr)) { + SetFlag(chanPtr->state, BUFFER_READY); + } + if (FlushChannel(NULL, chanPtr, 0) != 0) { + return -1; + } + } + return 0; } /* *---------------------------------------------------------------------- * - * WriteChars -- + * Write -- * - * Convert UTF-8 bytes to the channel's external encoding and - * write the produced bytes into an output buffer, may queue the - * buffer for output if it gets full, and also remembers whether the - * current buffer is ready e.g. if it contains a newline and we are in - * line buffering mode. + * Convert srcLen bytes starting at src according to encoding and write + * produced bytes into an output buffer, may queue the buffer for output + * if it gets full, and also remembers whether the current buffer is + * ready e.g. if it contains a newline and we are in line buffering mode. * * Results: * The number of bytes written or -1 in case of error. If -1, @@ -3008,318 +4063,166 @@ WriteBytes(chanPtr, src, srcLen) */ static int -WriteChars(chanPtr, src, srcLen) - Channel *chanPtr; /* The channel to buffer output for. */ - CONST char *src; /* UTF-8 string to write. */ - int srcLen; /* Length of UTF-8 string in bytes. */ +Write( + Channel *chanPtr, /* The channel to buffer output for. */ + const char *src, /* UTF-8 string to write. */ + int srcLen, /* Length of UTF-8 string in bytes. */ + Tcl_Encoding encoding) { - ChannelBuffer *bufPtr; - char *dst, *stage; - int saved, savedLF, sawLF, total, toWrite, flags; - int dstWrote, dstLen, stageLen, stageMax, stageRead; - Tcl_Encoding encoding; - char safe[BUFFER_PADDING]; - - total = 0; - sawLF = 0; - savedLF = 0; - saved = 0; - encoding = chanPtr->encoding; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ + char *nextNewLine = NULL; + int endEncoding, saved = 0, total = 0, flushed = 0, needNlFlush = 0; + + if (srcLen) { + WillWrite(chanPtr); + } /* - * Loop over all UTF-8 characters in src, storing them in staging buffer - * with proper EOL translation. + * Write the terminated escape sequence even if srcLen is 0. */ - while (srcLen + savedLF > 0) { - stage = chanPtr->outputStage; - stageMax = chanPtr->bufSize; - stageLen = stageMax; + endEncoding = ((statePtr->outputEncodingFlags & TCL_ENCODING_END) != 0); - toWrite = stageLen; - if (toWrite > srcLen) { - toWrite = srcLen; - } - - if (savedLF) { - /* - * A '\n' was left over from last call to TranslateOutputEOL() - * and we need to store it in the staging buffer. If the - * channel is line-based, we will need to flush the output - * buffer (after translating the staging buffer). - */ - - *stage++ = '\n'; - stageLen--; - sawLF++; - } - sawLF += TranslateOutputEOL(chanPtr, stage, src, &stageLen, &toWrite); + if (GotFlag(statePtr, CHANNEL_LINEBUFFERED) + || (statePtr->outputTranslation != TCL_TRANSLATE_LF)) { + nextNewLine = memchr(src, '\n', srcLen); + } - stage -= savedLF; - stageLen += savedLF; - savedLF = 0; + while (srcLen + saved + endEncoding > 0) { + ChannelBuffer *bufPtr; + char *dst, safe[BUFFER_PADDING]; + int result, srcRead, dstLen, dstWrote, srcLimit = srcLen; - if (stageLen > stageMax) { - savedLF = 1; - stageLen = stageMax; + if (nextNewLine) { + srcLimit = nextNewLine - src; } - src += toWrite; - srcLen -= toWrite; - - flags = chanPtr->outputEncodingFlags; - if (srcLen == 0) { - flags |= TCL_ENCODING_END; + + /* Get space to write into */ + bufPtr = statePtr->curOutPtr; + if (bufPtr == NULL) { + bufPtr = AllocChannelBuffer(statePtr->bufSize); + statePtr->curOutPtr = bufPtr; } + if (saved) { + /* + * Here's some translated bytes left over from the last buffer + * that we need to stick at the beginning of this buffer. + */ - /* - * Loop over all UTF-8 characters in staging buffer, converting them - * to external encoding, storing them in output buffer. - */ + memcpy(InsertPoint(bufPtr), safe, (size_t) saved); + bufPtr->nextAdded += saved; + saved = 0; + } + PreserveChannelBuffer(bufPtr); + dst = InsertPoint(bufPtr); + dstLen = SpaceLeft(bufPtr); - while (stageLen + saved > 0) { - bufPtr = chanPtr->curOutPtr; - if (bufPtr == NULL) { - bufPtr = AllocChannelBuffer(chanPtr->bufSize); - chanPtr->curOutPtr = bufPtr; - } - dst = bufPtr->buf + bufPtr->nextAdded; - dstLen = bufPtr->bufLength - bufPtr->nextAdded; + result = Tcl_UtfToExternal(NULL, encoding, src, srcLimit, + statePtr->outputEncodingFlags, + &statePtr->outputEncodingState, dst, + dstLen + BUFFER_PADDING, &srcRead, &dstWrote, NULL); - if (saved != 0) { - /* - * Here's some translated bytes left over from the last - * buffer that we need to stick at the beginning of this - * buffer. - */ - - memcpy((VOID *) dst, (VOID *) safe, (size_t) saved); - bufPtr->nextAdded += saved; - dst += saved; - dstLen -= saved; - saved = 0; + /* See chan-io-1.[89]. Tcl Bug 506297. */ + statePtr->outputEncodingFlags &= ~TCL_ENCODING_START; + + if ((result != TCL_OK) && (srcRead + dstWrote == 0)) { + /* We're reading from invalid/incomplete UTF-8 */ + ReleaseChannelBuffer(bufPtr); + if (total == 0) { + Tcl_SetErrno(EINVAL); + return -1; } + break; + } - Tcl_UtfToExternal(NULL, encoding, stage, stageLen, flags, - &chanPtr->outputEncodingState, dst, - dstLen + BUFFER_PADDING, &stageRead, &dstWrote, NULL); - if (stageRead + dstWrote == 0) { - /* - * We have an incomplete UTF-8 character at the end of the - * staging buffer. It will get moved to the beginning of the - * staging buffer followed by more bytes from src. - */ - - src -= stageLen; - srcLen += stageLen; - stageLen = 0; - savedLF = 0; + bufPtr->nextAdded += dstWrote; + src += srcRead; + srcLen -= srcRead; + total += dstWrote; + dst += dstWrote; + dstLen -= dstWrote; + + if (src == nextNewLine && dstLen > 0) { + static char crln[3] = "\r\n"; + char *nl = NULL; + int nlLen = 0; + + switch (statePtr->outputTranslation) { + case TCL_TRANSLATE_LF: + nl = crln + 1; + nlLen = 1; + break; + case TCL_TRANSLATE_CR: + nl = crln; + nlLen = 1; + break; + case TCL_TRANSLATE_CRLF: + nl = crln; + nlLen = 2; + break; + default: + Tcl_Panic("unknown output translation requested"); break; } - bufPtr->nextAdded += dstWrote; - if (bufPtr->nextAdded > bufPtr->bufLength) { - /* - * When translating from UTF-8 to external encoding, we - * allowed the translation to produce a character that - * crossed the end of the output buffer, so that we would - * get a completely full buffer before flushing it. The - * extra bytes will be moved to the beginning of the next - * buffer. - */ + + result |= Tcl_UtfToExternal(NULL, encoding, nl, nlLen, + statePtr->outputEncodingFlags, + &statePtr->outputEncodingState, dst, + dstLen + BUFFER_PADDING, &srcRead, &dstWrote, NULL); - saved = bufPtr->nextAdded - bufPtr->bufLength; - memcpy((VOID *) safe, (VOID *) (dst + dstLen), (size_t) saved); - bufPtr->nextAdded = bufPtr->bufLength; - } - if (CheckFlush(chanPtr, bufPtr, sawLF) != 0) { - return -1; + if (srcRead != nlLen) { + Tcl_Panic("Can This Happen?"); } + bufPtr->nextAdded += dstWrote; + src++; + srcLen--; total += dstWrote; - stage += stageRead; - stageLen -= stageRead; - sawLF = 0; + dst += dstWrote; + dstLen -= dstWrote; + nextNewLine = memchr(src, '\n', srcLen); + needNlFlush = 1; } - } - return total; -} - -/* - *--------------------------------------------------------------------------- - * - * TranslateOutputEOL -- - * - * Helper function for WriteBytes() and WriteChars(). Converts the - * '\n' characters in the source buffer into the appropriate EOL - * form specified by the output translation mode. - * - * EOL translation stops either when the source buffer is empty - * or the output buffer is full. - * - * When converting to CRLF mode and there is only 1 byte left in - * the output buffer, this routine stores the '\r' in the last - * byte and then stores the '\n' in the byte just past the end of the - * buffer. The caller is responsible for passing in a buffer that - * is large enough to hold the extra byte. - * - * Results: - * The return value is 1 if a '\n' was translated from the source - * buffer, or 0 otherwise -- this can be used by the caller to - * decide to flush a line-based channel even though the channel - * buffer is not full. - * - * *dstLenPtr is filled with how many bytes of the output buffer - * were used. As mentioned above, this can be one more that - * the output buffer's specified length if a CRLF was stored. - * - * *srcLenPtr is filled with how many bytes of the source buffer - * were consumed. - * - * Side effects: - * It may be obvious, but bears mentioning that when converting - * in CRLF mode (which requires two bytes of storage in the output - * buffer), the number of bytes consumed from the source buffer - * will be less than the number of bytes stored in the output buffer. - * - *--------------------------------------------------------------------------- - */ -static int -TranslateOutputEOL(chanPtr, dst, src, dstLenPtr, srcLenPtr) - Channel *chanPtr; /* Channel being read, for translation and - * buffering modes. */ - char *dst; /* Output buffer filled with UTF-8 chars by - * applying appropriate EOL translation to - * source characters. */ - CONST char *src; /* Source UTF-8 characters. */ - int *dstLenPtr; /* On entry, the maximum length of output - * buffer in bytes. On exit, the number of - * bytes actually used in output buffer. */ - int *srcLenPtr; /* On entry, the length of source buffer. - * On exit, the number of bytes read from - * the source buffer. */ -{ - char *dstEnd; - int srcLen, newlineFound; - - newlineFound = 0; - srcLen = *srcLenPtr; - - switch (chanPtr->outputTranslation) { - case TCL_TRANSLATE_LF: { - for (dstEnd = dst + srcLen; dst < dstEnd; ) { - if (*src == '\n') { - newlineFound = 1; - } - *dst++ = *src++; - } - *dstLenPtr = srcLen; - break; - } - case TCL_TRANSLATE_CR: { - for (dstEnd = dst + srcLen; dst < dstEnd;) { - if (*src == '\n') { - *dst++ = '\r'; - newlineFound = 1; - src++; - } else { - *dst++ = *src++; - } - } - *dstLenPtr = srcLen; - break; - } - case TCL_TRANSLATE_CRLF: { + if (IsBufferOverflowing(bufPtr)) { /* - * Since this causes the number of bytes to grow, we - * start off trying to put 'srcLen' bytes into the - * output buffer, but allow it to store more bytes, as - * long as there's still source bytes and room in the - * output buffer. + * When translating from UTF-8 to external encoding, we + * allowed the translation to produce a character that crossed + * the end of the output buffer, so that we would get a + * completely full buffer before flushing it. The extra bytes + * will be moved to the beginning of the next buffer. */ - char *dstStart, *dstMax; - CONST char *srcStart; - - dstStart = dst; - dstMax = dst + *dstLenPtr; - - srcStart = src; - - if (srcLen < *dstLenPtr) { - dstEnd = dst + srcLen; - } else { - dstEnd = dst + *dstLenPtr; - } - while (dst < dstEnd) { - if (*src == '\n') { - if (dstEnd < dstMax) { - dstEnd++; - } - *dst++ = '\r'; - newlineFound = 1; - } - *dst++ = *src++; - } - *srcLenPtr = src - srcStart; - *dstLenPtr = dst - dstStart; - break; - } - default: { - break; + saved = -SpaceLeft(bufPtr); + memcpy(safe, dst + dstLen, (size_t) saved); + bufPtr->nextAdded = bufPtr->bufLength; } - } - return newlineFound; -} - -/* - *--------------------------------------------------------------------------- - * - * CheckFlush -- - * - * Helper function for WriteBytes() and WriteChars(). If the - * channel buffer is ready to be flushed, flush it. - * - * Results: - * The return value is -1 if there was a problem flushing the - * channel buffer, or 0 otherwise. - * - * Side effects: - * The buffer will be recycled if it is flushed. - * - *--------------------------------------------------------------------------- - */ -static int -CheckFlush(chanPtr, bufPtr, newlineFlag) - Channel *chanPtr; /* Channel being read, for buffering mode. */ - ChannelBuffer *bufPtr; /* Channel buffer to possibly flush. */ - int newlineFlag; /* Non-zero if a the channel buffer - * contains a newline. */ -{ - /* - * The current buffer is ready for output: - * 1. if it is full. - * 2. if it contains a newline and this channel is line-buffered. - * 3. if it contains any output and this channel is unbuffered. - */ + if ((srcLen + saved == 0) && (result == TCL_OK)) { + endEncoding = 0; + } - if ((chanPtr->flags & BUFFER_READY) == 0) { - if (bufPtr->nextAdded == bufPtr->bufLength) { - chanPtr->flags |= BUFFER_READY; - } else if (chanPtr->flags & CHANNEL_LINEBUFFERED) { - if (newlineFlag != 0) { - chanPtr->flags |= BUFFER_READY; + if (IsBufferFull(bufPtr)) { + if (FlushChannel(NULL, chanPtr, 0) != 0) { + return -1; + } + flushed += statePtr->bufSize; + if (saved == 0 || src[-1] != '\n') { + needNlFlush = 0; } - } else if (chanPtr->flags & CHANNEL_UNBUFFERED) { - chanPtr->flags |= BUFFER_READY; } + ReleaseChannelBuffer(bufPtr); } - if (chanPtr->flags & BUFFER_READY) { + if ((flushed < total) && (GotFlag(statePtr, CHANNEL_UNBUFFERED) || + (needNlFlush && GotFlag(statePtr, CHANNEL_LINEBUFFERED)))) { + SetFlag(statePtr, BUFFER_READY); if (FlushChannel(NULL, chanPtr, 0) != 0) { return -1; } } - return 0; + + return total; } /* @@ -3335,31 +4238,29 @@ CheckFlush(chanPtr, bufPtr, newlineFlag) * error or condition that occurred. * * Side effects: - * May flush output on the channel. May cause input to be consumed - * from the channel. + * May flush output on the channel. May cause input to be consumed from + * the channel. * *--------------------------------------------------------------------------- */ int -Tcl_Gets(chan, lineRead) - Tcl_Channel chan; /* Channel from which to read. */ - Tcl_DString *lineRead; /* The line read will be appended to this - * DString as UTF-8 characters. The caller +Tcl_Gets( + Tcl_Channel chan, /* Channel from which to read. */ + Tcl_DString *lineRead) /* The line read will be appended to this + * DString as UTF-8 characters. The caller * must have initialized it and is responsible * for managing the storage. */ { Tcl_Obj *objPtr; - int charsStored, length; - char *string; + int charsStored; - objPtr = Tcl_NewObj(); + TclNewObj(objPtr); charsStored = Tcl_GetsObj(chan, objPtr); if (charsStored > 0) { - string = Tcl_GetStringFromObj(objPtr, &length); - Tcl_DStringAppend(lineRead, string, length); + TclDStringAppendObj(lineRead, objPtr); } - Tcl_DecrRefCount(objPtr); + TclDecrRefCount(objPtr); return charsStored; } @@ -3369,57 +4270,74 @@ Tcl_Gets(chan, lineRead) * Tcl_GetsObj -- * * Accumulate input from the input channel until end-of-line or - * end-of-file has been seen. Bytes read from the input channel - * are converted to UTF-8 using the encoding specified by the - * channel. + * end-of-file has been seen. Bytes read from the input channel are + * converted to UTF-8 using the encoding specified by the channel. * * Results: * Number of characters accumulated in the object or -1 if error, - * blocked, or EOF. If -1, use Tcl_GetErrno() to retrieve the - * POSIX error code for the error or condition that occurred. + * blocked, or EOF. If -1, use Tcl_GetErrno() to retrieve the POSIX error + * code for the error or condition that occurred. * * Side effects: * Consumes input from the channel. * - * On reading EOF, leave channel pointing at EOF char. - * On reading EOL, leave channel pointing after EOL, but don't - * return EOL in dst buffer. + * On reading EOF, leave channel pointing at EOF char. On reading EOL, + * leave channel pointing after EOL, but don't return EOL in dst buffer. * *--------------------------------------------------------------------------- */ int -Tcl_GetsObj(chan, objPtr) - Tcl_Channel chan; /* Channel from which to read. */ - Tcl_Obj *objPtr; /* The line read will be appended to this +Tcl_GetsObj( + Tcl_Channel chan, /* Channel from which to read. */ + Tcl_Obj *objPtr) /* The line read will be appended to this * object as UTF-8 characters. */ { GetsState gs; - Channel *chanPtr; - int inEofChar, skip, copiedTotal; + Channel *chanPtr = (Channel *) chan; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ ChannelBuffer *bufPtr; + int inEofChar, skip, copiedTotal, oldLength, oldFlags, oldRemoved; Tcl_Encoding encoding; char *dst, *dstEnd, *eol, *eof; Tcl_EncodingState oldState; - int oldLength, oldFlags, oldRemoved; - chanPtr = (Channel *) chan; - if (CheckChannelErrors(chanPtr, TCL_READABLE) != 0) { + if (CheckChannelErrors(statePtr, TCL_READABLE) != 0) { copiedTotal = -1; goto done; } - bufPtr = chanPtr->inQueueHead; - encoding = chanPtr->encoding; + /* + * A binary version of Tcl_GetsObj. This could also handle encodings that + * are ascii-7 pure (iso8859, utf-8, ...) with a final encoding conversion + * done on objPtr. + */ + + if ((statePtr->encoding == NULL) + && ((statePtr->inputTranslation == TCL_TRANSLATE_LF) + || (statePtr->inputTranslation == TCL_TRANSLATE_CR))) { + return TclGetsObjBinary(chan, objPtr); + } /* - * Preserved so we can restore the channel's state in case we don't - * find a newline in the available input. + * This operation should occur at the top of a channel stack. */ - Tcl_GetStringFromObj(objPtr, &oldLength); - oldFlags = chanPtr->inputEncodingFlags; - oldState = chanPtr->inputEncodingState; + chanPtr = statePtr->topChanPtr; + Tcl_Preserve(chanPtr); + + bufPtr = statePtr->inQueueHead; + encoding = statePtr->encoding; + + /* + * Preserved so we can restore the channel's state in case we don't find a + * newline in the available input. + */ + + TclGetStringFromObj(objPtr, &oldLength); + oldFlags = statePtr->inputEncodingFlags; + oldState = statePtr->inputEncodingState; oldRemoved = BUFFER_PADDING; if (bufPtr != NULL) { oldRemoved = bufPtr->nextRemoved; @@ -3427,17 +4345,16 @@ Tcl_GetsObj(chan, objPtr) /* * If there is no encoding, use "iso8859-1" -- Tcl_GetsObj() doesn't - * produce ByteArray objects. To avoid circularity problems, - * "iso8859-1" is builtin to Tcl. + * produce ByteArray objects. */ if (encoding == NULL) { - encoding = Tcl_GetEncoding(NULL, "iso8859-1"); + encoding = GetBinaryEncoding(); } /* - * Object used by FilterInputBytes to keep track of how much data has - * been consumed from the channel buffers. + * Object used by FilterInputBytes to keep track of how much data has been + * consumed from the channel buffers. */ gs.objPtr = objPtr; @@ -3455,7 +4372,7 @@ Tcl_GetsObj(chan, objPtr) skip = 0; eof = NULL; - inEofChar = chanPtr->inEofChar; + inEofChar = statePtr->inEofChar; while (1) { if (dst >= dstEnd) { @@ -3464,10 +4381,10 @@ Tcl_GetsObj(chan, objPtr) } dstEnd = dst + gs.bytesWrote; } - + /* - * Remember if EOF char is seen, then look for EOL anyhow, because - * the EOL might be before the EOF char. + * Remember if EOF char is seen, then look for EOL anyhow, because the + * EOL might be before the EOF char. */ if (inEofChar != '\0') { @@ -3485,33 +4402,38 @@ Tcl_GetsObj(chan, objPtr) * don't store the EOL in the output string. */ - eol = dst; - switch (chanPtr->inputTranslation) { - case TCL_TRANSLATE_LF: { - for (eol = dst; eol < dstEnd; eol++) { - if (*eol == '\n') { - skip = 1; - goto goteol; - } + switch (statePtr->inputTranslation) { + case TCL_TRANSLATE_LF: + for (eol = dst; eol < dstEnd; eol++) { + if (*eol == '\n') { + skip = 1; + goto gotEOL; } - break; } - case TCL_TRANSLATE_CR: { - for (eol = dst; eol < dstEnd; eol++) { - if (*eol == '\r') { - skip = 1; - goto goteol; - } + break; + case TCL_TRANSLATE_CR: + for (eol = dst; eol < dstEnd; eol++) { + if (*eol == '\r') { + skip = 1; + goto gotEOL; } - break; } - case TCL_TRANSLATE_CRLF: { - for (eol = dst; eol < dstEnd; eol++) { - if (*eol == '\r') { - eol++; - if (eol >= dstEnd) { - int offset; - + break; + case TCL_TRANSLATE_CRLF: + for (eol = dst; eol < dstEnd; eol++) { + if (*eol == '\r') { + eol++; + + /* + * If a CR is at the end of the buffer, then check for a + * LF at the begining of the next buffer, unless EOF char + * was found already. + */ + + if (eol >= dstEnd) { + int offset; + + if (eol != eof) { offset = eol - objPtr->bytes; dst = dstEnd; if (FilterInputBytes(chanPtr, &gs) != 0) { @@ -3519,123 +4441,139 @@ Tcl_GetsObj(chan, objPtr) } dstEnd = dst + gs.bytesWrote; eol = objPtr->bytes + offset; - if (eol >= dstEnd) { - skip = 0; - goto goteol; - } } - if (*eol == '\n') { - eol--; - skip = 2; - goto goteol; + if (eol >= dstEnd) { + skip = 0; + goto gotEOL; } } + if (*eol == '\n') { + eol--; + skip = 2; + goto gotEOL; + } } - break; } - case TCL_TRANSLATE_AUTO: { - skip = 1; - if (chanPtr->flags & INPUT_SAW_CR) { - chanPtr->flags &= ~INPUT_SAW_CR; - if (*eol == '\n') { - /* - * Skip the raw bytes that make up the '\n'. - */ + break; + case TCL_TRANSLATE_AUTO: + eol = dst; + skip = 1; + if (GotFlag(statePtr, INPUT_SAW_CR)) { + ResetFlag(statePtr, INPUT_SAW_CR); + if ((eol < dstEnd) && (*eol == '\n')) { + /* + * Skip the raw bytes that make up the '\n'. + */ - char tmp[1 + TCL_UTF_MAX]; - int rawRead; - - bufPtr = gs.bufPtr; - Tcl_ExternalToUtf(NULL, gs.encoding, - bufPtr->buf + bufPtr->nextRemoved, - gs.rawRead, chanPtr->inputEncodingFlags, - &gs.state, tmp, 1 + TCL_UTF_MAX, &rawRead, - NULL, NULL); - bufPtr->nextRemoved += rawRead; - gs.rawRead -= rawRead; - gs.bytesWrote--; - gs.charsWrote--; - memmove(dst, dst + 1, (size_t) (dstEnd - dst)); - dstEnd--; - } + char tmp[1 + TCL_UTF_MAX]; + int rawRead; + + bufPtr = gs.bufPtr; + Tcl_ExternalToUtf(NULL, gs.encoding, RemovePoint(bufPtr), + gs.rawRead, statePtr->inputEncodingFlags, + &gs.state, tmp, 1 + TCL_UTF_MAX, &rawRead, NULL, + NULL); + bufPtr->nextRemoved += rawRead; + gs.rawRead -= rawRead; + gs.bytesWrote--; + gs.charsWrote--; + memmove(dst, dst + 1, (size_t) (dstEnd - dst)); + dstEnd--; } - for (eol = dst; eol < dstEnd; eol++) { - if (*eol == '\r') { - eol++; - if (eol == dstEnd) { - /* - * If buffer ended on \r, peek ahead to see if a - * \n is available. - */ + } + for (eol = dst; eol < dstEnd; eol++) { + if (*eol == '\r') { + eol++; + if (eol == dstEnd) { + /* + * If buffer ended on \r, peek ahead to see if a \n is + * available, unless EOF char was found already. + */ + if (eol != eof) { int offset; - + offset = eol - objPtr->bytes; dst = dstEnd; PeekAhead(chanPtr, &dstEnd, &gs); eol = objPtr->bytes + offset; - if (eol >= dstEnd) { - eol--; - chanPtr->flags |= INPUT_SAW_CR; - goto goteol; - } } - if (*eol == '\n') { - skip++; + + if (eol >= dstEnd) { + eol--; + SetFlag(statePtr, INPUT_SAW_CR); + goto gotEOL; } - eol--; - goto goteol; - } else if (*eol == '\n') { - goto goteol; } + if (*eol == '\n') { + skip++; + } + eol--; + goto gotEOL; + } else if (*eol == '\n') { + goto gotEOL; } } } if (eof != NULL) { /* - * EOF character was seen. On EOF, leave current file position + * EOF character was seen. On EOF, leave current file position * pointing at the EOF character, but don't store the EOF * character in the output string. */ dstEnd = eof; - chanPtr->flags |= (CHANNEL_EOF | CHANNEL_STICKY_EOF); - chanPtr->inputEncodingFlags |= TCL_ENCODING_END; + SetFlag(statePtr, CHANNEL_EOF | CHANNEL_STICKY_EOF); + statePtr->inputEncodingFlags |= TCL_ENCODING_END; } - if (chanPtr->flags & CHANNEL_EOF) { + if (GotFlag(statePtr, CHANNEL_EOF)) { skip = 0; eol = dstEnd; - if (eol == objPtr->bytes) { + if (eol == objPtr->bytes + oldLength) { /* - * If we didn't produce any bytes before encountering EOF, + * If we didn't append any bytes before encountering EOF, * caller needs to see -1. */ - Tcl_SetObjLength(objPtr, 0); - CommonGetsCleanup(chanPtr, encoding); + Tcl_SetObjLength(objPtr, oldLength); + CommonGetsCleanup(chanPtr); copiedTotal = -1; goto done; } - goto goteol; + goto gotEOL; } dst = dstEnd; } /* - * Found EOL or EOF, but the output buffer may now contain too many - * UTF-8 characters. We need to know how many raw bytes correspond to - * the number of UTF-8 characters we want, plus how many raw bytes - * correspond to the character(s) making up EOL (if any), so we can - * remove the correct number of bytes from the channel buffer. + * Found EOL or EOF, but the output buffer may now contain too many UTF-8 + * characters. We need to know how many raw bytes correspond to the number + * of UTF-8 characters we want, plus how many raw bytes correspond to the + * character(s) making up EOL (if any), so we can remove the correct + * number of bytes from the channel buffer. + */ + + gotEOL: + /* + * Regenerate the top channel, in case it was changed due to + * self-modifying reflected transforms. */ - - goteol: + + if (chanPtr != statePtr->topChanPtr) { + Tcl_Release(chanPtr); + chanPtr = statePtr->topChanPtr; + Tcl_Preserve(chanPtr); + } + bufPtr = gs.bufPtr; - chanPtr->inputEncodingState = gs.state; - Tcl_ExternalToUtf(NULL, gs.encoding, bufPtr->buf + bufPtr->nextRemoved, - gs.rawRead, chanPtr->inputEncodingFlags, - &chanPtr->inputEncodingState, dst, eol - dst + skip + TCL_UTF_MAX, - &gs.rawRead, NULL, &gs.charsWrote); + if (bufPtr == NULL) { + Tcl_Panic("Tcl_GetsObj: gotEOL reached with bufPtr==NULL"); + } + statePtr->inputEncodingState = gs.state; + Tcl_ExternalToUtf(NULL, gs.encoding, RemovePoint(bufPtr), gs.rawRead, + statePtr->inputEncodingFlags, &statePtr->inputEncodingState, dst, + eol - dst + skip + TCL_UTF_MAX, &gs.rawRead, NULL, + &gs.charsWrote); bufPtr->nextRemoved += gs.rawRead; /* @@ -3643,91 +4581,408 @@ Tcl_GetsObj(chan, objPtr) */ Tcl_SetObjLength(objPtr, eol - objPtr->bytes); - CommonGetsCleanup(chanPtr, encoding); - chanPtr->flags &= ~CHANNEL_BLOCKED; + CommonGetsCleanup(chanPtr); + ResetFlag(statePtr, CHANNEL_BLOCKED); copiedTotal = gs.totalChars + gs.charsWrote - skip; goto done; /* - * Couldn't get a complete line. This only happens if we get a error - * reading from the channel or we are non-blocking and there wasn't - * an EOL or EOF in the data available. + * Couldn't get a complete line. This only happens if we get a error + * reading from the channel or we are non-blocking and there wasn't an EOL + * or EOF in the data available. */ - restore: - bufPtr = chanPtr->inQueueHead; - bufPtr->nextRemoved = oldRemoved; + restore: + /* + * Regenerate the top channel, in case it was changed due to + * self-modifying reflected transforms. + */ + if (chanPtr != statePtr->topChanPtr) { + Tcl_Release(chanPtr); + chanPtr = statePtr->topChanPtr; + Tcl_Preserve(chanPtr); + } + bufPtr = statePtr->inQueueHead; + if (bufPtr != NULL) { + bufPtr->nextRemoved = oldRemoved; + bufPtr = bufPtr->nextPtr; + } - for (bufPtr = bufPtr->nextPtr; bufPtr != NULL; bufPtr = bufPtr->nextPtr) { + for ( ; bufPtr != NULL; bufPtr = bufPtr->nextPtr) { bufPtr->nextRemoved = BUFFER_PADDING; } - CommonGetsCleanup(chanPtr, encoding); + CommonGetsCleanup(chanPtr); - chanPtr->inputEncodingState = oldState; - chanPtr->inputEncodingFlags = oldFlags; + statePtr->inputEncodingState = oldState; + statePtr->inputEncodingFlags = oldFlags; Tcl_SetObjLength(objPtr, oldLength); /* * We didn't get a complete line so we need to indicate to UpdateInterest - * that the gets blocked. It will wait for more data instead of firing - * a timer, avoiding a busy wait. This is where we are assuming that the - * next operation is a gets. No more file events will be delivered on - * this channel until new data arrives or some operation is performed - * on the channel (e.g. gets, read, fconfigure) that changes the blocking - * state. Note that this means a file event will not be delivered even - * though a read would be able to consume the buffered data. + * that the gets blocked. It will wait for more data instead of firing a + * timer, avoiding a busy wait. This is where we are assuming that the + * next operation is a gets. No more file events will be delivered on this + * channel until new data arrives or some operation is performed on the + * channel (e.g. gets, read, fconfigure) that changes the blocking state. + * Note that this means a file event will not be delivered even though a + * read would be able to consume the buffered data. + */ + + SetFlag(statePtr, CHANNEL_NEED_MORE_DATA); + copiedTotal = -1; + + /* + * Update the notifier state so we don't block while there is still data + * in the buffers. + */ + + done: + /* + * Regenerate the top channel, in case it was changed due to + * self-modifying reflected transforms. + */ + if (chanPtr != statePtr->topChanPtr) { + Tcl_Release(chanPtr); + chanPtr = statePtr->topChanPtr; + Tcl_Preserve(chanPtr); + } + UpdateInterest(chanPtr); + Tcl_Release(chanPtr); + return copiedTotal; +} + +/* + *--------------------------------------------------------------------------- + * + * TclGetsObjBinary -- + * + * A variation of Tcl_GetsObj that works directly on the buffers until + * end-of-line or end-of-file has been seen. Bytes read from the input + * channel return as a ByteArray obj. + * + * Results: + * Number of characters accumulated in the object or -1 if error, + * blocked, or EOF. If -1, use Tcl_GetErrno() to retrieve the POSIX error + * code for the error or condition that occurred. + * + * Side effects: + * Consumes input from the channel. + * + * On reading EOF, leave channel pointing at EOF char. On reading EOL, + * leave channel pointing after EOL, but don't return EOL in dst buffer. + * + *--------------------------------------------------------------------------- + */ + +static int +TclGetsObjBinary( + Tcl_Channel chan, /* Channel from which to read. */ + Tcl_Obj *objPtr) /* The line read will be appended to this + * object as UTF-8 characters. */ +{ + Channel *chanPtr = (Channel *) chan; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ + ChannelBuffer *bufPtr; + int inEofChar, skip, copiedTotal, oldLength, oldFlags, oldRemoved; + int rawLen, byteLen, eolChar; + unsigned char *dst, *dstEnd, *eol, *eof, *byteArray; + + /* + * This operation should occur at the top of a channel stack. + */ + + chanPtr = statePtr->topChanPtr; + Tcl_Preserve(chanPtr); + + bufPtr = statePtr->inQueueHead; + + /* + * Preserved so we can restore the channel's state in case we don't find a + * newline in the available input. + */ + + byteArray = Tcl_GetByteArrayFromObj(objPtr, &byteLen); + oldFlags = statePtr->inputEncodingFlags; + oldRemoved = BUFFER_PADDING; + oldLength = byteLen; + if (bufPtr != NULL) { + oldRemoved = bufPtr->nextRemoved; + } + + rawLen = 0; + skip = 0; + eof = NULL; + inEofChar = statePtr->inEofChar; + + /* + * Only handle TCL_TRANSLATE_LF and TCL_TRANSLATE_CR. + */ + + eolChar = (statePtr->inputTranslation == TCL_TRANSLATE_LF) ? '\n' : '\r'; + + while (1) { + /* + * Subtract the number of bytes that were removed from channel + * buffer during last call. + */ + + if (bufPtr != NULL) { + bufPtr->nextRemoved += rawLen; + if (!IsBufferReady(bufPtr)) { + bufPtr = bufPtr->nextPtr; + } + } + + if ((bufPtr == NULL) || (bufPtr->nextAdded == BUFFER_PADDING)) { + /* + * All channel buffers were exhausted and the caller still + * hasn't seen EOL. Need to read more bytes from the channel + * device. Side effect is to allocate another channel buffer. + */ + + if (GotFlag(statePtr, CHANNEL_BLOCKED)) { + if (GotFlag(statePtr, CHANNEL_NONBLOCKING)) { + goto restore; + } + ResetFlag(statePtr, CHANNEL_BLOCKED); + } + if (GetInput(chanPtr) != 0) { + goto restore; + } + bufPtr = statePtr->inQueueTail; + if (bufPtr == NULL) { + goto restore; + } + } + + dst = (unsigned char *) RemovePoint(bufPtr); + dstEnd = dst + BytesLeft(bufPtr); + + /* + * Remember if EOF char is seen, then look for EOL anyhow, because the + * EOL might be before the EOF char. + * XXX - in the binary case, consider coincident search for eol/eof. + */ + + if (inEofChar != '\0') { + for (eol = dst; eol < dstEnd; eol++) { + if (*eol == inEofChar) { + dstEnd = eol; + eof = eol; + break; + } + } + } + + /* + * On EOL, leave current file position pointing after the EOL, but + * don't store the EOL in the output string. + */ + + for (eol = dst; eol < dstEnd; eol++) { + if (*eol == eolChar) { + skip = 1; + goto gotEOL; + } + } + if (eof != NULL) { + /* + * EOF character was seen. On EOF, leave current file position + * pointing at the EOF character, but don't store the EOF + * character in the output string. + */ + + SetFlag(statePtr, CHANNEL_EOF | CHANNEL_STICKY_EOF); + statePtr->inputEncodingFlags |= TCL_ENCODING_END; + } + if (GotFlag(statePtr, CHANNEL_EOF)) { + skip = 0; + eol = dstEnd; + if ((dst == dstEnd) && (byteLen == oldLength)) { + /* + * If we didn't append any bytes before encountering EOF, + * caller needs to see -1. + */ + + byteArray = Tcl_SetByteArrayLength(objPtr, oldLength); + CommonGetsCleanup(chanPtr); + copiedTotal = -1; + goto done; + } + goto gotEOL; + } + + /* + * Copy bytes from the channel buffer to the ByteArray. + * This may realloc space, so keep track of result. + */ + + rawLen = dstEnd - dst; + byteArray = Tcl_SetByteArrayLength(objPtr, byteLen + rawLen); + memcpy(byteArray + byteLen, dst, (size_t) rawLen); + byteLen += rawLen; + } + + /* + * Found EOL or EOF, but the output buffer may now contain too many bytes. + * We need to know how many bytes correspond to the number we want, so we + * can remove the correct number of bytes from the channel buffer. + */ + + gotEOL: + if (bufPtr == NULL) { + Tcl_Panic("TclGetsObjBinary: gotEOL reached with bufPtr==NULL"); + } + + rawLen = eol - dst; + byteArray = Tcl_SetByteArrayLength(objPtr, byteLen + rawLen); + memcpy(byteArray + byteLen, dst, (size_t) rawLen); + byteLen += rawLen; + bufPtr->nextRemoved += rawLen + skip; + + /* + * Convert the buffer if there was an encoding. + * XXX - unimplemented. + */ + + if (statePtr->encoding != NULL) { + } + + /* + * Recycle all the emptied buffers. + */ + + CommonGetsCleanup(chanPtr); + ResetFlag(statePtr, CHANNEL_BLOCKED); + copiedTotal = byteLen; + goto done; + + /* + * Couldn't get a complete line. This only happens if we get a error + * reading from the channel or we are non-blocking and there wasn't an EOL + * or EOF in the data available. + */ + + restore: + bufPtr = statePtr->inQueueHead; + if (bufPtr) { + bufPtr->nextRemoved = oldRemoved; + bufPtr = bufPtr->nextPtr; + } + + for ( ; bufPtr != NULL; bufPtr = bufPtr->nextPtr) { + bufPtr->nextRemoved = BUFFER_PADDING; + } + CommonGetsCleanup(chanPtr); + + statePtr->inputEncodingFlags = oldFlags; + byteArray = Tcl_SetByteArrayLength(objPtr, oldLength); + + /* + * We didn't get a complete line so we need to indicate to UpdateInterest + * that the gets blocked. It will wait for more data instead of firing a + * timer, avoiding a busy wait. This is where we are assuming that the + * next operation is a gets. No more file events will be delivered on this + * channel until new data arrives or some operation is performed on the + * channel (e.g. gets, read, fconfigure) that changes the blocking state. + * Note that this means a file event will not be delivered even though a + * read would be able to consume the buffered data. */ - chanPtr->flags |= CHANNEL_NEED_MORE_DATA; + SetFlag(statePtr, CHANNEL_NEED_MORE_DATA); copiedTotal = -1; - done: /* - * Update the notifier state so we don't block while there is still - * data in the buffers. + * Update the notifier state so we don't block while there is still data + * in the buffers. */ + done: UpdateInterest(chanPtr); + Tcl_Release(chanPtr); return copiedTotal; } + +/* + *--------------------------------------------------------------------------- + * + * FreeBinaryEncoding -- + * + * Frees any "iso8859-1" Tcl_Encoding created by [gets] on a binary + * channel in a thread as part of that thread's finalization. + * + * Results: + * None. + * + *--------------------------------------------------------------------------- + */ + +static void +FreeBinaryEncoding( + ClientData dummy) /* Not used */ +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + + if (tsdPtr->binaryEncoding != NULL) { + Tcl_FreeEncoding(tsdPtr->binaryEncoding); + tsdPtr->binaryEncoding = NULL; + } +} + +static Tcl_Encoding +GetBinaryEncoding() +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + if (tsdPtr->binaryEncoding == NULL) { + tsdPtr->binaryEncoding = Tcl_GetEncoding(NULL, "iso8859-1"); + Tcl_CreateThreadExitHandler(FreeBinaryEncoding, NULL); + } + if (tsdPtr->binaryEncoding == NULL) { + Tcl_Panic("binary encoding is not available"); + } + return tsdPtr->binaryEncoding; +} + /* *--------------------------------------------------------------------------- * * FilterInputBytes -- * - * Helper function for Tcl_GetsObj. Produces UTF-8 characters from - * raw bytes read from the channel. + * Helper function for Tcl_GetsObj. Produces UTF-8 characters from raw + * bytes read from the channel. * - * Consumes available bytes from channel buffers. When channel - * buffers are exhausted, reads more bytes from channel device into - * a new channel buffer. It is the caller's responsibility to - * free the channel buffers that have been exhausted. + * Consumes available bytes from channel buffers. When channel buffers + * are exhausted, reads more bytes from channel device into a new channel + * buffer. It is the caller's responsibility to free the channel buffers + * that have been exhausted. * * Results: - * The return value is -1 if there was an error reading from the - * channel, 0 otherwise. + * The return value is -1 if there was an error reading from the channel, + * 0 otherwise. * * Side effects: - * Status object keeps track of how much data from channel buffers - * has been consumed and where UTF-8 bytes should be stored. + * Status object keeps track of how much data from channel buffers has + * been consumed and where UTF-8 bytes should be stored. * *--------------------------------------------------------------------------- */ - + static int -FilterInputBytes(chanPtr, gsPtr) - Channel *chanPtr; /* Channel to read. */ - GetsState *gsPtr; /* Current state of gets operation. */ +FilterInputBytes( + Channel *chanPtr, /* Channel to read. */ + GetsState *gsPtr) /* Current state of gets operation. */ { + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ ChannelBuffer *bufPtr; - char *raw, *rawStart, *rawEnd; - char *dst; - int offset, toRead, dstNeeded, spaceLeft, result, rawLen, length; + char *raw, *rawStart, *dst; + int offset, toRead, dstNeeded, spaceLeft, result, rawLen; Tcl_Obj *objPtr; -#define ENCODING_LINESIZE 30 /* Lower bound on how many bytes to convert - * at a time. Since we don't know a priori - * how many bytes of storage this many source +#define ENCODING_LINESIZE 20 /* Lower bound on how many bytes to convert at + * a time. Since we don't know a priori how + * many bytes of storage this many source * bytes will use, we actually need at least * ENCODING_LINESIZE * TCL_MAX_UTF bytes of * room. */ @@ -3742,7 +4997,7 @@ FilterInputBytes(chanPtr, gsPtr) bufPtr = gsPtr->bufPtr; if (bufPtr != NULL) { bufPtr->nextRemoved += gsPtr->rawRead; - if (bufPtr->nextRemoved >= bufPtr->nextAdded) { + if (!IsBufferReady(bufPtr)) { bufPtr = bufPtr->nextPtr; } } @@ -3750,39 +5005,43 @@ FilterInputBytes(chanPtr, gsPtr) if ((bufPtr == NULL) || (bufPtr->nextAdded == BUFFER_PADDING)) { /* - * All channel buffers were exhausted and the caller still hasn't - * seen EOL. Need to read more bytes from the channel device. - * Side effect is to allocate another channel buffer. + * All channel buffers were exhausted and the caller still hasn't seen + * EOL. Need to read more bytes from the channel device. Side effect + * is to allocate another channel buffer. */ - - read: - if (chanPtr->flags & CHANNEL_BLOCKED) { - if (chanPtr->flags & CHANNEL_NONBLOCKING) { + + read: + if (GotFlag(statePtr, CHANNEL_BLOCKED)) { + if (GotFlag(statePtr, CHANNEL_NONBLOCKING)) { gsPtr->charsWrote = 0; gsPtr->rawRead = 0; return -1; } - chanPtr->flags &= ~CHANNEL_BLOCKED; - } + ResetFlag(statePtr, CHANNEL_BLOCKED); + } if (GetInput(chanPtr) != 0) { gsPtr->charsWrote = 0; gsPtr->rawRead = 0; return -1; } - bufPtr = chanPtr->inQueueTail; + bufPtr = statePtr->inQueueTail; gsPtr->bufPtr = bufPtr; + if (bufPtr == NULL) { + gsPtr->charsWrote = 0; + gsPtr->rawRead = 0; + return -1; + } } /* - * Convert some of the bytes from the channel buffer to UTF-8. Space in - * objPtr's string rep is used to hold the UTF-8 characters. Grow the + * Convert some of the bytes from the channel buffer to UTF-8. Space in + * objPtr's string rep is used to hold the UTF-8 characters. Grow the * string rep if we need more space. */ - rawStart = bufPtr->buf + bufPtr->nextRemoved; + rawStart = RemovePoint(bufPtr); raw = rawStart; - rawEnd = bufPtr->buf + bufPtr->nextAdded; - rawLen = rawEnd - rawStart; + rawLen = BytesLeft(bufPtr); dst = *gsPtr->dstPtr; offset = dst - objPtr->bytes; @@ -3790,66 +5049,78 @@ FilterInputBytes(chanPtr, gsPtr) if (toRead > rawLen) { toRead = rawLen; } - dstNeeded = toRead * TCL_UTF_MAX + 1; - spaceLeft = objPtr->length - offset - TCL_UTF_MAX - 1; + dstNeeded = toRead * TCL_UTF_MAX; + spaceLeft = objPtr->length - offset; if (dstNeeded > spaceLeft) { - length = offset * 2; - if (offset < dstNeeded) { + int length = offset + ((offset < dstNeeded) ? dstNeeded : offset); + + if (Tcl_AttemptSetObjLength(objPtr, length) == 0) { length = offset + dstNeeded; + if (Tcl_AttemptSetObjLength(objPtr, length) == 0) { + dstNeeded = TCL_UTF_MAX - 1 + toRead; + length = offset + dstNeeded; + Tcl_SetObjLength(objPtr, length); + } } - length += TCL_UTF_MAX + 1; - Tcl_SetObjLength(objPtr, length); spaceLeft = length - offset; dst = objPtr->bytes + offset; *gsPtr->dstPtr = dst; } - gsPtr->state = chanPtr->inputEncodingState; + gsPtr->state = statePtr->inputEncodingState; result = Tcl_ExternalToUtf(NULL, gsPtr->encoding, raw, rawLen, - chanPtr->inputEncodingFlags, &chanPtr->inputEncodingState, - dst, spaceLeft, &gsPtr->rawRead, &gsPtr->bytesWrote, - &gsPtr->charsWrote); + statePtr->inputEncodingFlags, &statePtr->inputEncodingState, + dst, spaceLeft+1, &gsPtr->rawRead, &gsPtr->bytesWrote, + &gsPtr->charsWrote); + + /* + * Make sure that if we go through 'gets', that we reset the + * TCL_ENCODING_START flag still. [Bug #523988] + */ + + statePtr->inputEncodingFlags &= ~TCL_ENCODING_START; + if (result == TCL_CONVERT_MULTIBYTE) { /* * The last few bytes in this channel buffer were the start of a - * multibyte sequence. If this buffer was full, then move them to - * the next buffer so the bytes will be contiguous. + * multibyte sequence. If this buffer was full, then move them to the + * next buffer so the bytes will be contiguous. */ ChannelBuffer *nextPtr; int extra; - + nextPtr = bufPtr->nextPtr; - if (bufPtr->nextAdded < bufPtr->bufLength) { + if (!IsBufferFull(bufPtr)) { if (gsPtr->rawRead > 0) { /* - * Some raw bytes were converted to UTF-8. Fall through, + * Some raw bytes were converted to UTF-8. Fall through, * returning those UTF-8 characters because a EOL might be * present in them. */ - } else if (chanPtr->flags & CHANNEL_EOF) { + } else if (GotFlag(statePtr, CHANNEL_EOF)) { /* * There was a partial character followed by EOF on the - * device. Fall through, returning that nothing was found. + * device. Fall through, returning that nothing was found. */ - bufPtr->nextRemoved = bufPtr->nextAdded; + bufPtr->nextRemoved = bufPtr->nextAdded; } else { /* - * There are no more cached raw bytes left. See if we can - * get some more. + * There are no more cached raw bytes left. See if we can get + * some more. */ goto read; } } else { if (nextPtr == NULL) { - nextPtr = AllocChannelBuffer(chanPtr->bufSize); + nextPtr = AllocChannelBuffer(statePtr->bufSize); bufPtr->nextPtr = nextPtr; - chanPtr->inQueueTail = nextPtr; + statePtr->inQueueTail = nextPtr; } extra = rawLen - gsPtr->rawRead; - memcpy((VOID *) (nextPtr->buf + BUFFER_PADDING - extra), - (VOID *) (raw + gsPtr->rawRead), (size_t) extra); + memcpy(nextPtr->buf + (BUFFER_PADDING - extra), + raw + gsPtr->rawRead, (size_t) extra); nextPtr->nextRemoved -= extra; bufPtr->nextAdded -= extra; } @@ -3864,9 +5135,9 @@ FilterInputBytes(chanPtr, gsPtr) * * PeekAhead -- * - * Helper function used by Tcl_GetsObj(). Called when we've seen a - * \r at the end of the UTF-8 string and want to look ahead one - * character to see if it is a \n. + * Helper function used by Tcl_GetsObj(). Called when we've seen a \r at + * the end of the UTF-8 string and want to look ahead one character to + * see if it is a \n. * * Results: * *gsPtr->dstPtr is filled with a pointer to the start of the range of @@ -3882,12 +5153,14 @@ FilterInputBytes(chanPtr, gsPtr) */ static void -PeekAhead(chanPtr, dstEndPtr, gsPtr) - Channel *chanPtr; /* The channel to read. */ - char **dstEndPtr; /* Filled with pointer to end of new range - * of UTF-8 characters. */ - GetsState *gsPtr; /* Current state of gets operation. */ +PeekAhead( + Channel *chanPtr, /* The channel to read. */ + char **dstEndPtr, /* Filled with pointer to end of new range of + * UTF-8 characters. */ + GetsState *gsPtr) /* Current state of gets operation. */ { + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ ChannelBuffer *bufPtr; Tcl_DriverBlockModeProc *blockModeProc; int bytesLeft; @@ -3896,25 +5169,25 @@ PeekAhead(chanPtr, dstEndPtr, gsPtr) /* * If there's any more raw input that's still buffered, we'll peek into - * that. Otherwise, only get more data from the channel driver if it - * looks like there might actually be more data. The assumption is that - * if the channel buffer is filled right up to the end, then there - * might be more data to read. + * that. Otherwise, only get more data from the channel driver if it looks + * like there might actually be more data. The assumption is that if the + * channel buffer is filled right up to the end, then there might be more + * data to read. */ blockModeProc = NULL; if (bufPtr->nextPtr == NULL) { - bytesLeft = bufPtr->nextAdded - (bufPtr->nextRemoved + gsPtr->rawRead); + bytesLeft = BytesLeft(bufPtr) - gsPtr->rawRead; if (bytesLeft == 0) { - if (bufPtr->nextAdded < bufPtr->bufLength) { + if (!IsBufferFull(bufPtr)) { /* * Don't peek ahead if last read was short read. */ - + goto cleanup; } - if ((chanPtr->flags & CHANNEL_NONBLOCKING) == 0) { - blockModeProc = chanPtr->typePtr->blockModeProc; + if (!GotFlag(statePtr, CHANNEL_NONBLOCKING)) { + blockModeProc = Tcl_ChannelBlockModeProc(chanPtr->typePtr); if (blockModeProc == NULL) { /* * Don't peek ahead if cannot set non-blocking mode. @@ -3922,7 +5195,7 @@ PeekAhead(chanPtr, dstEndPtr, gsPtr) goto cleanup; } - (*blockModeProc)(chanPtr->instanceData, TCL_MODE_NONBLOCKING); + StackSetBlockMode(chanPtr, TCL_MODE_NONBLOCKING); } } } @@ -3930,11 +5203,11 @@ PeekAhead(chanPtr, dstEndPtr, gsPtr) *dstEndPtr = *gsPtr->dstPtr + gsPtr->bytesWrote; } if (blockModeProc != NULL) { - (*blockModeProc)(chanPtr->instanceData, TCL_MODE_BLOCKING); + StackSetBlockMode(chanPtr, TCL_MODE_BLOCKING); } return; - cleanup: + cleanup: bufPtr->nextRemoved += gsPtr->rawRead; gsPtr->rawRead = 0; gsPtr->totalChars += gsPtr->charsWrote; @@ -3947,8 +5220,8 @@ PeekAhead(chanPtr, dstEndPtr, gsPtr) * * CommonGetsCleanup -- * - * Helper function for Tcl_GetsObj() to restore the channel after - * a "gets" operation. + * Helper function for Tcl_GetsObj() to restore the channel after a + * "gets" operation. * * Results: * None. @@ -3958,43 +5231,44 @@ PeekAhead(chanPtr, dstEndPtr, gsPtr) * *--------------------------------------------------------------------------- */ - + static void -CommonGetsCleanup(chanPtr, encoding) - Channel *chanPtr; - Tcl_Encoding encoding; +CommonGetsCleanup( + Channel *chanPtr) { + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ ChannelBuffer *bufPtr, *nextPtr; - - bufPtr = chanPtr->inQueueHead; + + bufPtr = statePtr->inQueueHead; for ( ; bufPtr != NULL; bufPtr = nextPtr) { nextPtr = bufPtr->nextPtr; - if (bufPtr->nextRemoved < bufPtr->nextAdded) { + if (IsBufferReady(bufPtr)) { break; } - RecycleBuffer(chanPtr, bufPtr, 0); + RecycleBuffer(statePtr, bufPtr, 0); } - chanPtr->inQueueHead = bufPtr; + statePtr->inQueueHead = bufPtr; if (bufPtr == NULL) { - chanPtr->inQueueTail = NULL; + statePtr->inQueueTail = NULL; } else { /* * If any multi-byte characters were split across channel buffer * boundaries, the split-up bytes were moved to the next channel - * buffer by FilterInputBytes(). Move the bytes back to their - * original buffer because the caller could change the channel's - * encoding which could change the interpretation of whether those - * bytes really made up multi-byte characters after all. + * buffer by FilterInputBytes(). Move the bytes back to their original + * buffer because the caller could change the channel's encoding which + * could change the interpretation of whether those bytes really made + * up multi-byte characters after all. */ - + nextPtr = bufPtr->nextPtr; for ( ; nextPtr != NULL; nextPtr = bufPtr->nextPtr) { int extra; - extra = bufPtr->bufLength - bufPtr->nextAdded; + extra = SpaceLeft(bufPtr); if (extra > 0) { - memcpy((VOID *) (bufPtr->buf + bufPtr->nextAdded), - (VOID *) (nextPtr->buf + BUFFER_PADDING - extra), + memcpy(InsertPoint(bufPtr), + nextPtr->buf + (BUFFER_PADDING - extra), (size_t) extra); bufPtr->nextAdded += extra; nextPtr->nextRemoved = BUFFER_PADDING; @@ -4002,9 +5276,6 @@ CommonGetsCleanup(chanPtr, encoding) bufPtr = nextPtr; } } - if (chanPtr->encoding == NULL) { - Tcl_FreeEncoding(encoding); - } } /* @@ -4012,16 +5283,16 @@ CommonGetsCleanup(chanPtr, encoding) * * Tcl_Read -- * - * Reads a given number of bytes from a channel. EOL and EOF - * translation is done on the bytes being read, so the the number - * of bytes consumed from the channel may not be equal to the - * number of bytes stored in the destination buffer. + * Reads a given number of bytes from a channel. EOL and EOF translation + * is done on the bytes being read, so the number of bytes consumed from + * the channel may not be equal to the number of bytes stored in the + * destination buffer. * * No encoding conversions are applied to the bytes being read. * * Results: - * The number of bytes read, or -1 on error. Use Tcl_GetErrno() - * to retrieve the error code for the error that occurred. + * The number of bytes read, or -1 on error. Use Tcl_GetErrno() to + * retrieve the error code for the error that occurred. * * Side effects: * May cause input to be buffered. @@ -4030,19 +5301,186 @@ CommonGetsCleanup(chanPtr, encoding) */ int -Tcl_Read(chan, dst, bytesToRead) - Tcl_Channel chan; /* The channel from which to read. */ - char *dst; /* Where to store input read. */ - int bytesToRead; /* Maximum number of bytes to read. */ +Tcl_Read( + Tcl_Channel chan, /* The channel from which to read. */ + char *dst, /* Where to store input read. */ + int bytesToRead) /* Maximum number of bytes to read. */ { - Channel *chanPtr; - - chanPtr = (Channel *) chan; - if (CheckChannelErrors(chanPtr, TCL_READABLE) != 0) { + Channel *chanPtr = (Channel *) chan; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ + + /* + * This operation should occur at the top of a channel stack. + */ + + chanPtr = statePtr->topChanPtr; + + if (CheckChannelErrors(statePtr, TCL_READABLE) != 0) { + return -1; + } + + return DoRead(chanPtr, dst, bytesToRead, 0); +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ReadRaw -- + * + * Reads a given number of bytes from a channel. EOL and EOF translation + * is done on the bytes being read, so the number of bytes consumed from + * the channel may not be equal to the number of bytes stored in the + * destination buffer. + * + * No encoding conversions are applied to the bytes being read. + * + * Results: + * The number of bytes read, or -1 on error. Use Tcl_GetErrno() to + * retrieve the error code for the error that occurred. + * + * Side effects: + * May cause input to be buffered. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_ReadRaw( + Tcl_Channel chan, /* The channel from which to read. */ + char *bufPtr, /* Where to store input read. */ + int bytesToRead) /* Maximum number of bytes to read. */ +{ + Channel *chanPtr = (Channel *) chan; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ + int nread, result, copied, copiedNow; + + /* + * The check below does too much because it will reject a call to this + * function with a channel which is part of an 'fcopy'. But we have to + * allow this here or else the chaining in the transformation drivers will + * fail with 'file busy' error instead of retrieving and transforming the + * data to copy. + * + * We let the check procedure now believe that there is no fcopy in + * progress. A better solution than this might be an additional flag + * argument to switch off specific checks. + */ + + if (CheckChannelErrors(statePtr, TCL_READABLE | CHANNEL_RAW_MODE) != 0) { return -1; } - return DoRead(chanPtr, dst, bytesToRead); + /* + * Check for information in the push-back buffers. If there is some, use + * it. Go to the driver only if there is none (anymore) and the caller + * requests more bytes. + */ + + Tcl_Preserve(chanPtr); + for (copied = 0; copied < bytesToRead; copied += copiedNow) { + copiedNow = CopyBuffer(chanPtr, bufPtr + copied, + bytesToRead - copied); + if (copiedNow == 0) { + if (GotFlag(statePtr, CHANNEL_EOF)) { + goto done; + } + if (GotFlag(statePtr, CHANNEL_BLOCKED)) { + if (GotFlag(statePtr, CHANNEL_NONBLOCKING)) { + goto done; + } + ResetFlag(statePtr, CHANNEL_BLOCKED); + } + +#ifdef TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING + /* + * [Bug 943274]. Better emulation of non-blocking channels for + * channels without BlockModeProc, by keeping track of true + * fileevents generated by the OS == Data waiting and reading if + * and only if we are sure to have data. + */ + + if (GotFlag(statePtr, CHANNEL_NONBLOCKING) && + (Tcl_ChannelBlockModeProc(chanPtr->typePtr) == NULL) && + !GotFlag(statePtr, CHANNEL_HAS_MORE_DATA)) { + /* + * We bypass the driver; it would block as no data is + * available. + */ + + nread = -1; + result = EWOULDBLOCK; + } else +#endif /* TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING */ + { + /* + * Now go to the driver to get as much as is possible to fill + * the remaining request. Do all the error handling by + * ourselves. The code was stolen from 'GetInput' and slightly + * adapted (different return value here). + * + * The case of 'bytesToRead == 0' at this point cannot happen. + */ + + nread = ChanRead(chanPtr, bufPtr + copied, + bytesToRead - copied, &result); + } + + if (nread > 0) { + /* + * If we get a short read, signal up that we may be BLOCKED. + * We should avoid calling the driver because on some + * platforms we will block in the low level reading code even + * though the channel is set into nonblocking mode. + */ + + if (nread < (bytesToRead - copied)) { + SetFlag(statePtr, CHANNEL_BLOCKED); + } + +#ifdef TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING + if (nread <= (bytesToRead - copied)) { + /* + * [Bug 943274] We have read the available data, clear + * flag. + */ + + ResetFlag(statePtr, CHANNEL_HAS_MORE_DATA); + } +#endif /* TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING */ + } else if (nread == 0) { + SetFlag(statePtr, CHANNEL_EOF); + statePtr->inputEncodingFlags |= TCL_ENCODING_END; + + } else if (nread < 0) { + if ((result == EWOULDBLOCK) || (result == EAGAIN)) { + if (copied > 0) { + /* + * Information that was copied earlier has precedence + * over EAGAIN/WOULDBLOCK handling. + */ + + goto done; + } + + SetFlag(statePtr, CHANNEL_BLOCKED); + result = EAGAIN; + } + + Tcl_SetErrno(result); + copied = -1; + goto done; + } + + copied += nread; + goto done; + } + } + + done: + Tcl_Release(chanPtr); + return copied; } /* @@ -4050,73 +5488,137 @@ Tcl_Read(chan, dst, bytesToRead) * * Tcl_ReadChars -- * - * Reads from the channel until the requested number of characters - * have been seen, EOF is seen, or the channel would block. EOL - * and EOF translation is done. If reading binary data, the raw - * bytes are wrapped in a Tcl byte array object. Otherwise, the raw - * bytes are converted to UTF-8 using the channel's current encoding - * and stored in a Tcl string object. + * Reads from the channel until the requested number of characters have + * been seen, EOF is seen, or the channel would block. EOL and EOF + * translation is done. If reading binary data, the raw bytes are wrapped + * in a Tcl byte array object. Otherwise, the raw bytes are converted to + * UTF-8 using the channel's current encoding and stored in a Tcl string + * object. * * Results: - * The number of characters read, or -1 on error. Use Tcl_GetErrno() - * to retrieve the error code for the error that occurred. + * The number of characters read, or -1 on error. Use Tcl_GetErrno() to + * retrieve the error code for the error that occurred. * * Side effects: * May cause input to be buffered. * *--------------------------------------------------------------------------- */ - + int -Tcl_ReadChars(chan, objPtr, toRead, appendFlag) - Tcl_Channel chan; /* The channel to read. */ - Tcl_Obj *objPtr; /* Input data is stored in this object. */ - int toRead; /* Maximum number of characters to store, - * or -1 to read all available data (up to EOF - * or when channel blocks). */ - int appendFlag; /* If non-zero, data read from the channel - * will be appended to the object. Otherwise, +Tcl_ReadChars( + Tcl_Channel chan, /* The channel to read. */ + Tcl_Obj *objPtr, /* Input data is stored in this object. */ + int toRead, /* Maximum number of characters to store, or + * -1 to read all available data (up to EOF or + * when channel blocks). */ + int appendFlag) /* If non-zero, data read from the channel + * will be appended to the object. Otherwise, * the data will replace the existing contents * of the object. */ +{ + Channel *chanPtr = (Channel *) chan; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ + /* + * This operation should occur at the top of a channel stack. + */ + + chanPtr = statePtr->topChanPtr; + + if (CheckChannelErrors(statePtr, TCL_READABLE) != 0) { + /* + * Update the notifier state so we don't block while there is still + * data in the buffers. + */ + + UpdateInterest(chanPtr); + return -1; + } + + return DoReadChars(chanPtr, objPtr, toRead, appendFlag); +} +/* + *--------------------------------------------------------------------------- + * + * DoReadChars -- + * + * Reads from the channel until the requested number of characters have + * been seen, EOF is seen, or the channel would block. EOL and EOF + * translation is done. If reading binary data, the raw bytes are wrapped + * in a Tcl byte array object. Otherwise, the raw bytes are converted to + * UTF-8 using the channel's current encoding and stored in a Tcl string + * object. + * + * Results: + * The number of characters read, or -1 on error. Use Tcl_GetErrno() to + * retrieve the error code for the error that occurred. + * + * Side effects: + * May cause input to be buffered. + * + *--------------------------------------------------------------------------- + */ + +static int +DoReadChars( + Channel *chanPtr, /* The channel to read. */ + Tcl_Obj *objPtr, /* Input data is stored in this object. */ + int toRead, /* Maximum number of characters to store, or + * -1 to read all available data (up to EOF or + * when channel blocks). */ + int appendFlag) /* If non-zero, data read from the channel + * will be appended to the object. Otherwise, + * the data will replace the existing contents + * of the object. */ { - Channel *chanPtr; - int offset, factor, copied, copiedNow, result; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ ChannelBuffer *bufPtr; + int offset, factor, copied, copiedNow, result; Tcl_Encoding encoding; #define UTF_EXPANSION_FACTOR 1024 - - chanPtr = (Channel *) chan; - if (CheckChannelErrors(chanPtr, TCL_READABLE) != 0) { - copied = -1; - goto done; - } - encoding = chanPtr->encoding; + /* + * This operation should occur at the top of a channel stack. + */ + + chanPtr = statePtr->topChanPtr; + encoding = statePtr->encoding; factor = UTF_EXPANSION_FACTOR; + Tcl_Preserve(chanPtr); if (appendFlag == 0) { if (encoding == NULL) { Tcl_SetByteArrayLength(objPtr, 0); } else { Tcl_SetObjLength(objPtr, 0); + + /* + * We're going to access objPtr->bytes directly, so we must ensure + * that this is actually a string object (otherwise it might have + * been pure Unicode). + */ + + TclGetString(objPtr); } offset = 0; } else { if (encoding == NULL) { Tcl_GetByteArrayFromObj(objPtr, &offset); } else { - Tcl_GetStringFromObj(objPtr, &offset); + TclGetStringFromObj(objPtr, &offset); } } for (copied = 0; (unsigned) toRead > 0; ) { copiedNow = -1; - if (chanPtr->inQueueHead != NULL) { + if (statePtr->inQueueHead != NULL) { if (encoding == NULL) { - copiedNow = ReadBytes(chanPtr, objPtr, toRead, &offset); + copiedNow = ReadBytes(statePtr, objPtr, toRead, &offset); } else { - copiedNow = ReadChars(chanPtr, objPtr, toRead, &offset, + copiedNow = ReadChars(statePtr, objPtr, toRead, &offset, &factor); } @@ -4124,29 +5626,34 @@ Tcl_ReadChars(chan, objPtr, toRead, appendFlag) * If the current buffer is empty recycle it. */ - bufPtr = chanPtr->inQueueHead; - if (bufPtr->nextRemoved == bufPtr->nextAdded) { - ChannelBuffer *nextPtr; + bufPtr = statePtr->inQueueHead; + if (IsBufferEmpty(bufPtr)) { + ChannelBuffer *nextPtr = bufPtr->nextPtr; - nextPtr = bufPtr->nextPtr; - RecycleBuffer(chanPtr, bufPtr, 0); - chanPtr->inQueueHead = nextPtr; + RecycleBuffer(statePtr, bufPtr, 0); + statePtr->inQueueHead = nextPtr; if (nextPtr == NULL) { - chanPtr->inQueueTail = nextPtr; + statePtr->inQueueTail = NULL; } } } + if (copiedNow < 0) { - if (chanPtr->flags & CHANNEL_EOF) { + if (GotFlag(statePtr, CHANNEL_EOF)) { break; } - if (chanPtr->flags & CHANNEL_BLOCKED) { - if (chanPtr->flags & CHANNEL_NONBLOCKING) { + if (GotFlag(statePtr, CHANNEL_BLOCKED)) { + if (GotFlag(statePtr, CHANNEL_NONBLOCKING)) { break; } - chanPtr->flags &= ~CHANNEL_BLOCKED; + ResetFlag(statePtr, CHANNEL_BLOCKED); } result = GetInput(chanPtr); + if (chanPtr != statePtr->topChanPtr) { + Tcl_Release(chanPtr); + chanPtr = statePtr->topChanPtr; + Tcl_Preserve(chanPtr); + } if (result != 0) { if (result == EAGAIN) { break; @@ -4159,41 +5666,52 @@ Tcl_ReadChars(chan, objPtr, toRead, appendFlag) toRead -= copiedNow; } } - chanPtr->flags &= ~CHANNEL_BLOCKED; + + ResetFlag(statePtr, CHANNEL_BLOCKED); if (encoding == NULL) { Tcl_SetByteArrayLength(objPtr, offset); } else { Tcl_SetObjLength(objPtr, offset); } - done: /* - * Update the notifier state so we don't block while there is still - * data in the buffers. + * Update the notifier state so we don't block while there is still data + * in the buffers. */ + done: + /* + * Regenerate the top channel, in case it was changed due to + * self-modifying reflected transforms. + */ + if (chanPtr != statePtr->topChanPtr) { + Tcl_Release(chanPtr); + chanPtr = statePtr->topChanPtr; + Tcl_Preserve(chanPtr); + } UpdateInterest(chanPtr); + Tcl_Release(chanPtr); return copied; } + /* *--------------------------------------------------------------------------- * * ReadBytes -- * - * Reads from the channel until the requested number of bytes have - * been seen, EOF is seen, or the channel would block. Bytes from - * the channel are stored in objPtr as a ByteArray object. EOL - * and EOF translation are done. + * Reads from the channel until the requested number of bytes have been + * seen, EOF is seen, or the channel would block. Bytes from the channel + * are stored in objPtr as a ByteArray object. EOL and EOF translation + * are done. * - * 'bytesToRead' can safely be a very large number because - * space is only allocated to hold data read from the channel - * as needed. + * 'bytesToRead' can safely be a very large number because space is only + * allocated to hold data read from the channel as needed. * * Results: - * The return value is the number of bytes appended to the object - * and *offsetPtr is filled with the total number of bytes in the - * object (greater than the return value if there were already bytes - * in the object). + * The return value is the number of bytes appended to the object and + * *offsetPtr is filled with the total number of bytes in the object + * (greater than the return value if there were already bytes in the + * object). * * Side effects: * None. @@ -4202,35 +5720,34 @@ Tcl_ReadChars(chan, objPtr, toRead, appendFlag) */ static int -ReadBytes(chanPtr, objPtr, bytesToRead, offsetPtr) - Channel *chanPtr; /* The channel to read. */ - int bytesToRead; /* Maximum number of characters to store, - * or < 0 to get all available characters. - * Characters are obtained from the first - * buffer in the queue -- even if this number - * is larger than the number of characters - * available in the first buffer, only the - * characters from the first buffer are - * returned. */ - Tcl_Obj *objPtr; /* Input data is appended to this ByteArray - * object. Its length is how much space - * has been allocated to hold data, not how - * many bytes of data have been stored in the +ReadBytes( + ChannelState *statePtr, /* State of the channel to read. */ + Tcl_Obj *objPtr, /* Input data is appended to this ByteArray + * object. Its length is how much space has + * been allocated to hold data, not how many + * bytes of data have been stored in the * object. */ - int *offsetPtr; /* On input, contains how many bytes of - * objPtr have been used to hold data. On - * output, filled with how many bytes are now - * being used. */ + int bytesToRead, /* Maximum number of bytes to store, or < 0 to + * get all available bytes. Bytes are obtained + * from the first buffer in the queue - even + * if this number is larger than the number of + * bytes available in the first buffer, only + * the bytes from the first buffer are + * returned. */ + int *offsetPtr) /* On input, contains how many bytes of objPtr + * have been used to hold data. On output, + * filled with how many bytes are now being + * used. */ { - int toRead, srcLen, srcRead, dstWrote, offset, length; + int toRead, srcLen, offset, length, srcRead, dstWrote; ChannelBuffer *bufPtr; char *src, *dst; offset = *offsetPtr; - bufPtr = chanPtr->inQueueHead; - src = bufPtr->buf + bufPtr->nextRemoved; - srcLen = bufPtr->nextAdded - bufPtr->nextRemoved; + bufPtr = statePtr->inQueueHead; + src = RemovePoint(bufPtr); + srcLen = BytesLeft(bufPtr); toRead = bytesToRead; if ((unsigned) toRead > (unsigned) srcLen) { @@ -4240,9 +5757,9 @@ ReadBytes(chanPtr, objPtr, bytesToRead, offsetPtr) dst = (char *) Tcl_GetByteArrayFromObj(objPtr, &length); if (toRead > length - offset - 1) { /* - * Double the existing size of the object or make enough room to - * hold all the characters we may get from the source buffer, - * whichever is larger. + * Double the existing size of the object or make enough room to hold + * all the characters we may get from the source buffer, whichever is + * larger. */ length = offset * 2; @@ -4253,8 +5770,8 @@ ReadBytes(chanPtr, objPtr, bytesToRead, offsetPtr) } dst += offset; - if (chanPtr->flags & INPUT_NEED_NL) { - chanPtr->flags &= ~INPUT_NEED_NL; + if (GotFlag(statePtr, INPUT_NEED_NL)) { + ResetFlag(statePtr, INPUT_NEED_NL); if ((srcLen == 0) || (*src != '\n')) { *dst = '\r'; *offsetPtr += 1; @@ -4268,7 +5785,7 @@ ReadBytes(chanPtr, objPtr, bytesToRead, offsetPtr) srcRead = srcLen; dstWrote = toRead; - if (TranslateInputEOL(chanPtr, dst, src, &dstWrote, &srcRead) != 0) { + if (TranslateInputEOL(statePtr, dst, src, &dstWrote, &srcRead) != 0) { if (dstWrote == 0) { return -1; } @@ -4283,21 +5800,21 @@ ReadBytes(chanPtr, objPtr, bytesToRead, offsetPtr) * * ReadChars -- * - * Reads from the channel until the requested number of UTF-8 - * characters have been seen, EOF is seen, or the channel would - * block. Raw bytes from the channel are converted to UTF-8 - * and stored in objPtr. EOL and EOF translation is done. + * Reads from the channel until the requested number of UTF-8 characters + * have been seen, EOF is seen, or the channel would block. Raw bytes + * from the channel are converted to UTF-8 and stored in objPtr. EOL and + * EOF translation is done. + * + * 'charsToRead' can safely be a very large number because space is only + * allocated to hold data read from the channel as needed. * - * 'charsToRead' can safely be a very large number because - * space is only allocated to hold data read from the channel - * as needed. + * 'charsToRead' may *not* be 0. * * Results: - * The return value is the number of characters appended to - * the object, *offsetPtr is filled with the number of bytes that - * were appended, and *factorPtr is filled with the expansion - * factor used to guess how many bytes of UTF-8 to allocate to - * hold N source bytes. + * The return value is the number of characters appended to the object, + * *offsetPtr is filled with the number of bytes that were appended, and + * *factorPtr is filled with the expansion factor used to guess how many + * bytes of UTF-8 to allocate to hold N source bytes. * * Side effects: * None. @@ -4306,42 +5823,43 @@ ReadBytes(chanPtr, objPtr, bytesToRead, offsetPtr) */ static int -ReadChars(chanPtr, objPtr, charsToRead, offsetPtr, factorPtr) - Channel *chanPtr; /* The channel to read. */ - int charsToRead; /* Maximum number of characters to store, - * or -1 to get all available characters. +ReadChars( + ChannelState *statePtr, /* State of channel to read. */ + Tcl_Obj *objPtr, /* Input data is appended to this object. + * objPtr->length is how much space has been + * allocated to hold data, not how many bytes + * of data have been stored in the object. */ + int charsToRead, /* Maximum number of characters to store, or + * -1 to get all available characters. * Characters are obtained from the first * buffer in the queue -- even if this number * is larger than the number of characters * available in the first buffer, only the * characters from the first buffer are * returned. */ - Tcl_Obj *objPtr; /* Input data is appended to this object. - * objPtr->length is how much space has been - * allocated to hold data, not how many bytes - * of data have been stored in the object. */ - int *offsetPtr; /* On input, contains how many bytes of - * objPtr have been used to hold data. On - * output, filled with how many bytes are now - * being used. */ - int *factorPtr; /* On input, contains a guess of how many + int *offsetPtr, /* On input, contains how many bytes of objPtr + * have been used to hold data. On output, + * filled with how many bytes are now being + * used. */ + int *factorPtr) /* On input, contains a guess of how many * bytes need to be allocated to hold the * result of converting N source bytes to - * UTF-8. On output, contains another guess + * UTF-8. On output, contains another guess * based on the data seen so far. */ { - int toRead, factor, offset, spaceLeft, length; - int srcLen, srcRead, dstNeeded, dstRead, dstWrote, numChars; + int toRead, factor, offset, spaceLeft, srcLen, dstNeeded; + int srcRead, dstWrote, numChars, dstRead; ChannelBuffer *bufPtr; char *src, *dst; Tcl_EncodingState oldState; + int encEndFlagSuppressed = 0; factor = *factorPtr; offset = *offsetPtr; - bufPtr = chanPtr->inQueueHead; - src = bufPtr->buf + bufPtr->nextRemoved; - srcLen = bufPtr->nextAdded - bufPtr->nextRemoved; + bufPtr = statePtr->inQueueHead; + src = RemovePoint(bufPtr); + srcLen = BytesLeft(bufPtr); toRead = charsToRead; if ((unsigned) toRead > (unsigned) srcLen) { @@ -4349,142 +5867,224 @@ ReadChars(chanPtr, objPtr, charsToRead, offsetPtr, factorPtr) } /* - * 'factor' is how much we guess that the bytes in the source buffer - * will expand when converted to UTF-8 chars. This guess comes from - * analyzing how many characters were produced by the previous - * pass. + * 'factor' is how much we guess that the bytes in the source buffer will + * expand when converted to UTF-8 chars. This guess comes from analyzing + * how many characters were produced by the previous pass. */ - dstNeeded = toRead * factor / UTF_EXPANSION_FACTOR; - spaceLeft = objPtr->length - offset - TCL_UTF_MAX - 1; + dstNeeded = TCL_UTF_MAX - 1 + toRead * factor / UTF_EXPANSION_FACTOR; + spaceLeft = objPtr->length - offset; if (dstNeeded > spaceLeft) { /* - * Double the existing size of the object or make enough room to - * hold all the characters we want from the source buffer, - * whichever is larger. + * Double the existing size of the object or make enough room to hold + * all the characters we want from the source buffer, whichever is + * larger. */ - length = offset * 2; - if (offset < dstNeeded) { + int length = offset + ((offset < dstNeeded) ? dstNeeded : offset); + + if (Tcl_AttemptSetObjLength(objPtr, length) == 0) { length = offset + dstNeeded; + if (Tcl_AttemptSetObjLength(objPtr, length) == 0) { + dstNeeded = TCL_UTF_MAX - 1 + toRead; + length = offset + dstNeeded; + Tcl_SetObjLength(objPtr, length); + } } spaceLeft = length - offset; - length += TCL_UTF_MAX + 1; - Tcl_SetObjLength(objPtr, length); } if (toRead == srcLen) { /* - * Want to convert the whole buffer in one pass. If we have - * enough space, convert it using all available space in object - * rather than using the factor. + * Want to convert the whole buffer in one pass. If we have enough + * space, convert it using all available space in object rather than + * using the factor. */ dstNeeded = spaceLeft; } dst = objPtr->bytes + offset; - oldState = chanPtr->inputEncodingState; - if (chanPtr->flags & INPUT_NEED_NL) { + /* + * [Bug 1462248]: The cause of the crash reported in this bug is this: + * + * - ReadChars, called with a single buffer, with a incomplete + * multi-byte character at the end (only the first byte of it). + * - Encoding translation fails, asks for more data + * - Data is read, and eof is reached, TCL_ENCODING_END (TEE) is set. + * - ReadChar is called again, converts the first buffer, but due to TEE + * it does not check for incomplete multi-byte data, and the character + * just after the end of the first buffer is a valid completion of the + * multi-byte header in the actual buffer. The conversion reads more + * characters from the buffer then present. This causes nextRemoved to + * overshoot nextAdded and the next reads compute a negative srcLen, + * cause further translations to fail, causing copying of data into the + * next buffer using bad arguments, causing the mecpy for to eventually + * fail. + * + * In the end it is a memory access bug spiraling out of control if the + * conditions are _just so_. And ultimate cause is that TEE is given to a + * conversion where it should not. TEE signals that this is the last + * buffer. Except in our case it is not. + * + * My solution is to suppress TEE if the first buffer is not the last. We + * will eventually need it given that EOF has been reached, but not right + * now. This is what the new flag "endEncSuppressFlag" is for. + * + * The bug in 'Tcl_Utf2UtfProc' where it read from memory behind the + * actual buffer has been fixed as well, and fixes the problem with the + * crash too, but this would still allow the generic layer to + * accidentially break a multi-byte sequence if the conditions are just + * right, because again the ExternalToUtf would be successful where it + * should not. + */ + + if ((statePtr->inputEncodingFlags & TCL_ENCODING_END) && + (bufPtr->nextPtr != NULL)) { + /* + * TEE is set for a buffer which is not the last. Squash it for now, + * and restore it later, before yielding control to our caller. + */ + + statePtr->inputEncodingFlags &= ~TCL_ENCODING_END; + encEndFlagSuppressed = 1; + } + + oldState = statePtr->inputEncodingState; + if (GotFlag(statePtr, INPUT_NEED_NL)) { /* * We want a '\n' because the last character we saw was '\r'. */ - - chanPtr->flags &= ~INPUT_NEED_NL; - Tcl_ExternalToUtf(NULL, chanPtr->encoding, src, srcLen, - chanPtr->inputEncodingFlags, &chanPtr->inputEncodingState, + + ResetFlag(statePtr, INPUT_NEED_NL); + Tcl_ExternalToUtf(NULL, statePtr->encoding, src, srcLen, + statePtr->inputEncodingFlags, &statePtr->inputEncodingState, dst, TCL_UTF_MAX + 1, &srcRead, &dstWrote, &numChars); if ((dstWrote > 0) && (*dst == '\n')) { /* - * The next char was a '\n'. Consume it and produce a '\n'. + * The next char was a '\n'. Consume it and produce a '\n'. */ - + bufPtr->nextRemoved += srcRead; } else { /* - * The next char was not a '\n'. Produce a '\r'. + * The next char was not a '\n'. Produce a '\r'. */ *dst = '\r'; } - chanPtr->inputEncodingFlags &= ~TCL_ENCODING_START; + statePtr->inputEncodingFlags &= ~TCL_ENCODING_START; *offsetPtr += 1; - return 1; + + if (encEndFlagSuppressed) { + statePtr->inputEncodingFlags |= TCL_ENCODING_END; + } + return 1; + } + + Tcl_ExternalToUtf(NULL, statePtr->encoding, src, srcLen, + statePtr->inputEncodingFlags, &statePtr->inputEncodingState, dst, + dstNeeded + 1, &srcRead, &dstWrote, &numChars); + + if (encEndFlagSuppressed) { + statePtr->inputEncodingFlags |= TCL_ENCODING_END; } - Tcl_ExternalToUtf(NULL, chanPtr->encoding, src, srcLen, - chanPtr->inputEncodingFlags, &chanPtr->inputEncodingState, dst, - dstNeeded + TCL_UTF_MAX, &srcRead, &dstWrote, &numChars); if (srcRead == 0) { /* - * Not enough bytes in src buffer to make a complete char. Copy - * the bytes to the next buffer to make a new contiguous string, - * then tell the caller to fill the buffer with more bytes. + * Not enough bytes in src buffer to make a complete char. Copy the + * bytes to the next buffer to make a new contiguous string, then tell + * the caller to fill the buffer with more bytes. */ ChannelBuffer *nextPtr; - + nextPtr = bufPtr->nextPtr; if (nextPtr == NULL) { - /* - * There isn't enough data in the buffers to complete the next - * character, so we need to wait for more data before the next - * file event can be delivered. - */ + if (srcLen > 0) { + /* + * There isn't enough data in the buffers to complete the next + * character, so we need to wait for more data before the next + * file event can be delivered. [Bug 478856] + * + * The exception to this is if the input buffer was completely + * empty before we tried to convert its contents. Nothing in, + * nothing out, and no incomplete character data. The + * conversion before the current one was complete. + */ - chanPtr->flags |= CHANNEL_NEED_MORE_DATA; + SetFlag(statePtr, CHANNEL_NEED_MORE_DATA); + } return -1; } + + /* + * Space is made at the beginning of the buffer to copy the previous + * unused bytes there. Check first if the buffer we are using actually + * has enough space at its beginning for the data we are copying. + * Because if not we will write over the buffer management + * information, especially the 'nextPtr'. + * + * Note that the BUFFER_PADDING (See AllocChannelBuffer) is used to + * prevent exactly this situation. I.e. it should never happen. + * Therefore it is ok to panic should it happen despite the + * precautions. + */ + + if (nextPtr->nextRemoved - srcLen < 0) { + Tcl_Panic("Buffer Underflow, BUFFER_PADDING not enough"); + } + nextPtr->nextRemoved -= srcLen; - memcpy((VOID *) (nextPtr->buf + nextPtr->nextRemoved), (VOID *) src, - (size_t) srcLen); - RecycleBuffer(chanPtr, bufPtr, 0); - chanPtr->inQueueHead = nextPtr; - return ReadChars(chanPtr, objPtr, charsToRead, offsetPtr, factorPtr); + memcpy(RemovePoint(nextPtr), src, (size_t) srcLen); + RecycleBuffer(statePtr, bufPtr, 0); + statePtr->inQueueHead = nextPtr; + return ReadChars(statePtr, objPtr, charsToRead, offsetPtr, factorPtr); } dstRead = dstWrote; - if (TranslateInputEOL(chanPtr, dst, dst, &dstWrote, &dstRead) != 0) { + if (TranslateInputEOL(statePtr, dst, dst, &dstWrote, &dstRead) != 0) { /* - * Hit EOF char. How many bytes of src correspond to where the - * EOF was located in dst? + * Hit EOF char. How many bytes of src correspond to where the EOF was + * located in dst? Run the conversion again with an output buffer just + * big enough to hold the data so we can get the correct value for + * srcRead. */ - + if (dstWrote == 0) { return -1; } - chanPtr->inputEncodingState = oldState; - Tcl_ExternalToUtf(NULL, chanPtr->encoding, src, srcLen, - chanPtr->inputEncodingFlags, &chanPtr->inputEncodingState, + statePtr->inputEncodingState = oldState; + Tcl_ExternalToUtf(NULL, statePtr->encoding, src, srcLen, + statePtr->inputEncodingFlags, &statePtr->inputEncodingState, dst, dstRead + TCL_UTF_MAX, &srcRead, &dstWrote, &numChars); - TranslateInputEOL(chanPtr, dst, dst, &dstWrote, &dstRead); - } + TranslateInputEOL(statePtr, dst, dst, &dstWrote, &dstRead); + } /* - * The number of characters that we got may be less than the number - * that we started with because "\r\n" sequences may have been - * turned into just '\n' in dst. + * The number of characters that we got may be less than the number that + * we started with because "\r\n" sequences may have been turned into just + * '\n' in dst. */ - numChars -= (dstRead - dstWrote); + numChars -= dstRead - dstWrote; if ((unsigned) numChars > (unsigned) toRead) { /* * Got too many chars. */ - char *eof; + const char *eof = Tcl_UtfAtIndex(dst, toRead); - eof = Tcl_UtfAtIndex(dst, toRead); - chanPtr->inputEncodingState = oldState; - Tcl_ExternalToUtf(NULL, chanPtr->encoding, src, srcLen, - chanPtr->inputEncodingFlags, &chanPtr->inputEncodingState, + statePtr->inputEncodingState = oldState; + Tcl_ExternalToUtf(NULL, statePtr->encoding, src, srcLen, + statePtr->inputEncodingFlags, &statePtr->inputEncodingState, dst, eof - dst + TCL_UTF_MAX, &srcRead, &dstWrote, &numChars); dstRead = dstWrote; - TranslateInputEOL(chanPtr, dst, dst, &dstWrote, &dstRead); + TranslateInputEOL(statePtr, dst, dst, &dstWrote, &dstRead); numChars -= (dstRead - dstWrote); } - chanPtr->inputEncodingFlags &= ~TCL_ENCODING_START; + statePtr->inputEncodingFlags &= ~TCL_ENCODING_START; bufPtr->nextRemoved += srcRead; if (dstWrote > srcRead + 1) { @@ -4499,12 +6099,12 @@ ReadChars(chanPtr, objPtr, charsToRead, offsetPtr, factorPtr) * * TranslateInputEOL -- * - * Perform input EOL and EOF translation on the source buffer, - * leaving the translated result in the destination buffer. + * Perform input EOL and EOF translation on the source buffer, leaving + * the translated result in the destination buffer. * * Results: * The return value is 1 if the EOF character was found when copying - * bytes to the destination buffer, 0 otherwise. + * bytes to the destination buffer, 0 otherwise. * * Side effects: * None. @@ -4513,39 +6113,38 @@ ReadChars(chanPtr, objPtr, charsToRead, offsetPtr, factorPtr) */ static int -TranslateInputEOL(chanPtr, dstStart, srcStart, dstLenPtr, srcLenPtr) - Channel *chanPtr; /* Channel being read, for EOL translation - * and EOF character. */ - char *dstStart; /* Output buffer filled with chars by - * applying appropriate EOL translation to - * source characters. */ - CONST char *srcStart; /* Source characters. */ - int *dstLenPtr; /* On entry, the maximum length of output - * buffer in bytes; must be <= *srcLenPtr. On +TranslateInputEOL( + ChannelState *statePtr, /* Channel being read, for EOL translation and + * EOF character. */ + char *dstStart, /* Output buffer filled with chars by applying + * appropriate EOL translation to source + * characters. */ + const char *srcStart, /* Source characters. */ + int *dstLenPtr, /* On entry, the maximum length of output + * buffer in bytes; must be <= *srcLenPtr. On * exit, the number of bytes actually used in * output buffer. */ - int *srcLenPtr; /* On entry, the length of source buffer. - * On exit, the number of bytes read from - * the source buffer. */ + int *srcLenPtr) /* On entry, the length of source buffer. On + * exit, the number of bytes read from the + * source buffer. */ { int dstLen, srcLen, inEofChar; - CONST char *eof; + const char *eof; dstLen = *dstLenPtr; eof = NULL; - inEofChar = chanPtr->inEofChar; + inEofChar = statePtr->inEofChar; if (inEofChar != '\0') { /* - * Find EOF in translated buffer then compress out the EOL. The - * source buffer may be much longer than the destination buffer -- - * we only want to return EOF if the EOF has been copied to the - * destination buffer. + * Find EOF in translated buffer then compress out the EOL. The source + * buffer may be much longer than the destination buffer - we only + * want to return EOF if the EOF has been copied to the destination + * buffer. */ - CONST char *src, *srcMax; + const char *src, *srcMax = srcStart + *srcLenPtr; - srcMax = srcStart + *srcLenPtr; for (src = srcStart; src < srcMax; src++) { if (*src == inEofChar) { eof = src; @@ -4558,107 +6157,105 @@ TranslateInputEOL(chanPtr, dstStart, srcStart, dstLenPtr, srcLenPtr) } } } - switch (chanPtr->inputTranslation) { - case TCL_TRANSLATE_LF: { - if (dstStart != srcStart) { - memcpy((VOID *) dstStart, (VOID *) srcStart, (size_t) dstLen); - } - srcLen = dstLen; - break; + switch (statePtr->inputTranslation) { + case TCL_TRANSLATE_LF: + if (dstStart != srcStart) { + memcpy(dstStart, srcStart, (size_t) dstLen); } - case TCL_TRANSLATE_CR: { - char *dst, *dstEnd; - - if (dstStart != srcStart) { - memcpy((VOID *) dstStart, (VOID *) srcStart, (size_t) dstLen); - } - dstEnd = dstStart + dstLen; - for (dst = dstStart; dst < dstEnd; dst++) { - if (*dst == '\r') { - *dst = '\n'; - } + srcLen = dstLen; + break; + case TCL_TRANSLATE_CR: { + char *dst, *dstEnd; + + if (dstStart != srcStart) { + memcpy(dstStart, srcStart, (size_t) dstLen); + } + dstEnd = dstStart + dstLen; + for (dst = dstStart; dst < dstEnd; dst++) { + if (*dst == '\r') { + *dst = '\n'; } - srcLen = dstLen; - break; } - case TCL_TRANSLATE_CRLF: { - char *dst; - CONST char *src, *srcEnd, *srcMax; - - dst = dstStart; - src = srcStart; - srcEnd = srcStart + dstLen; - srcMax = srcStart + *srcLenPtr; - - for ( ; src < srcEnd; ) { - if (*src == '\r') { - src++; - if (src >= srcMax) { - chanPtr->flags |= INPUT_NEED_NL; - } else if (*src == '\n') { - *dst++ = *src++; - } else { - *dst++ = '\r'; - } - } else { + srcLen = dstLen; + break; + } + case TCL_TRANSLATE_CRLF: { + char *dst; + const char *src, *srcEnd, *srcMax; + + dst = dstStart; + src = srcStart; + srcEnd = srcStart + dstLen; + srcMax = srcStart + *srcLenPtr; + + for ( ; src < srcEnd; ) { + if (*src == '\r') { + src++; + if (src >= srcMax) { + SetFlag(statePtr, INPUT_NEED_NL); + } else if (*src == '\n') { *dst++ = *src++; + } else { + *dst++ = '\r'; } + } else { + *dst++ = *src++; } - srcLen = src - srcStart; - dstLen = dst - dstStart; - break; } - case TCL_TRANSLATE_AUTO: { - char *dst; - CONST char *src, *srcEnd, *srcMax; + srcLen = src - srcStart; + dstLen = dst - dstStart; + break; + } + case TCL_TRANSLATE_AUTO: { + char *dst; + const char *src, *srcEnd, *srcMax; - dst = dstStart; - src = srcStart; - srcEnd = srcStart + dstLen; - srcMax = srcStart + *srcLenPtr; + dst = dstStart; + src = srcStart; + srcEnd = srcStart + dstLen; + srcMax = srcStart + *srcLenPtr; - if ((chanPtr->flags & INPUT_SAW_CR) && (src < srcMax)) { - if (*src == '\n') { - src++; - } - chanPtr->flags &= ~INPUT_SAW_CR; + if (GotFlag(statePtr, INPUT_SAW_CR) && (src < srcMax)) { + if (*src == '\n') { + src++; } - for ( ; src < srcEnd; ) { - if (*src == '\r') { - src++; - if (src >= srcMax) { - chanPtr->flags |= INPUT_SAW_CR; - } else if (*src == '\n') { - if (srcEnd < srcMax) { - srcEnd++; - } - src++; + ResetFlag(statePtr, INPUT_SAW_CR); + } + for ( ; src < srcEnd; ) { + if (*src == '\r') { + src++; + if (src >= srcMax) { + SetFlag(statePtr, INPUT_SAW_CR); + } else if (*src == '\n') { + if (srcEnd < srcMax) { + srcEnd++; } - *dst++ = '\n'; - } else { - *dst++ = *src++; + src++; } + *dst++ = '\n'; + } else { + *dst++ = *src++; } - srcLen = src - srcStart; - dstLen = dst - dstStart; - break; - } - default: { /* lint. */ - return 0; } + srcLen = src - srcStart; + dstLen = dst - dstStart; + break; + } + default: + return 0; } *dstLenPtr = dstLen; if ((eof != NULL) && (srcStart + srcLen >= eof)) { /* - * EOF character was seen in EOL translated range. Leave current - * file position pointing at the EOF character, but don't store the - * EOF character in the output string. + * EOF character was seen in EOL translated range. Leave current file + * position pointing at the EOF character, but don't store the EOF + * character in the output string. */ - chanPtr->flags |= (CHANNEL_EOF | CHANNEL_STICKY_EOF); - chanPtr->inputEncodingFlags |= TCL_ENCODING_END; - chanPtr->flags &= ~(INPUT_SAW_CR | INPUT_NEED_NL); + SetFlag(statePtr, CHANNEL_EOF | CHANNEL_STICKY_EOF); + statePtr->inputEncodingFlags |= TCL_ENCODING_END; + ResetFlag(statePtr, INPUT_SAW_CR | INPUT_NEED_NL); return 1; } @@ -4671,8 +6268,8 @@ TranslateInputEOL(chanPtr, dstStart, srcStart, dstLenPtr, srcLenPtr) * * Tcl_Ungets -- * - * Causes the supplied string to be added to the input queue of - * the channel, at either the head or tail of the queue. + * Causes the supplied string to be added to the input queue of the + * channel, at either the head or tail of the queue. * * Results: * The number of bytes stored in the channel, or -1 on error. @@ -4684,68 +6281,73 @@ TranslateInputEOL(chanPtr, dstStart, srcStart, dstLenPtr, srcLenPtr) */ int -Tcl_Ungets(chan, str, len, atEnd) - Tcl_Channel chan; /* The channel for which to add the input. */ - char *str; /* The input itself. */ - int len; /* The length of the input. */ - int atEnd; /* If non-zero, add at end of queue; otherwise - * add at head of queue. */ +Tcl_Ungets( + Tcl_Channel chan, /* The channel for which to add the input. */ + const char *str, /* The input itself. */ + int len, /* The length of the input. */ + int atEnd) /* If non-zero, add at end of queue; otherwise + * add at head of queue. */ { Channel *chanPtr; /* The real IO channel. */ + ChannelState *statePtr; /* State of actual channel. */ ChannelBuffer *bufPtr; /* Buffer to contain the data. */ - int i, flags; + int flags; chanPtr = (Channel *) chan; - + statePtr = chanPtr->state; + + /* + * This operation should occur at the top of a channel stack. + */ + + chanPtr = statePtr->topChanPtr; + /* * CheckChannelErrors clears too many flag bits in this one case. */ - - flags = chanPtr->flags; - if (CheckChannelErrors(chanPtr, TCL_READABLE) != 0) { + + flags = statePtr->flags; + if (CheckChannelErrors(statePtr, TCL_READABLE) != 0) { len = -1; goto done; } - chanPtr->flags = flags; + statePtr->flags = flags; /* - * If we have encountered a sticky EOF, just punt without storing. - * (sticky EOF is set if we have seen the input eofChar, to prevent - * reading beyond the eofChar). Otherwise, clear the EOF flags, and - * clear the BLOCKED bit. We want to discover these conditions anew - * in each operation. + * If we have encountered a sticky EOF, just punt without storing (sticky + * EOF is set if we have seen the input eofChar, to prevent reading beyond + * the eofChar). Otherwise, clear the EOF flags, and clear the BLOCKED + * bit. We want to discover these conditions anew in each operation. */ - if (chanPtr->flags & CHANNEL_STICKY_EOF) { + if (GotFlag(statePtr, CHANNEL_STICKY_EOF)) { goto done; } - chanPtr->flags &= (~(CHANNEL_BLOCKED | CHANNEL_EOF)); + ResetFlag(statePtr, CHANNEL_BLOCKED | CHANNEL_EOF); bufPtr = AllocChannelBuffer(len); - for (i = 0; i < len; i++) { - bufPtr->buf[i] = str[i]; - } + memcpy(InsertPoint(bufPtr), str, (size_t) len); bufPtr->nextAdded += len; - if (chanPtr->inQueueHead == (ChannelBuffer *) NULL) { - bufPtr->nextPtr = (ChannelBuffer *) NULL; - chanPtr->inQueueHead = bufPtr; - chanPtr->inQueueTail = bufPtr; + if (statePtr->inQueueHead == NULL) { + bufPtr->nextPtr = NULL; + statePtr->inQueueHead = bufPtr; + statePtr->inQueueTail = bufPtr; } else if (atEnd) { - bufPtr->nextPtr = (ChannelBuffer *) NULL; - chanPtr->inQueueTail->nextPtr = bufPtr; - chanPtr->inQueueTail = bufPtr; + bufPtr->nextPtr = NULL; + statePtr->inQueueTail->nextPtr = bufPtr; + statePtr->inQueueTail = bufPtr; } else { - bufPtr->nextPtr = chanPtr->inQueueHead; - chanPtr->inQueueHead = bufPtr; + bufPtr->nextPtr = statePtr->inQueueHead; + statePtr->inQueueHead = bufPtr; } - done: /* - * Update the notifier state so we don't block while there is still - * data in the buffers. + * Update the notifier state so we don't block while there is still data + * in the buffers. */ + done: UpdateInterest(chanPtr); return len; } @@ -4767,29 +6369,36 @@ Tcl_Ungets(chan, str, len, atEnd) */ int -Tcl_Flush(chan) - Tcl_Channel chan; /* The Channel to flush. */ +Tcl_Flush( + Tcl_Channel chan) /* The Channel to flush. */ { - int result; /* Of calling FlushChannel. */ - Channel *chanPtr; /* The actual channel. */ + int result; /* Of calling FlushChannel. */ + Channel *chanPtr = (Channel *) chan; + /* The actual channel. */ + ChannelState *statePtr = chanPtr->state; + /* State of actual channel. */ - chanPtr = (Channel *) chan; - if (CheckChannelErrors(chanPtr, TCL_WRITABLE) != 0) { + /* + * This operation should occur at the top of a channel stack. + */ + + chanPtr = statePtr->topChanPtr; + + if (CheckChannelErrors(statePtr, TCL_WRITABLE) != 0) { return -1; } /* * Force current output buffer to be output also. */ - - if ((chanPtr->curOutPtr != NULL) - && (chanPtr->curOutPtr->nextAdded > 0)) { - chanPtr->flags |= BUFFER_READY; + + if ((statePtr->curOutPtr != NULL) && IsBufferReady(statePtr->curOutPtr)) { + SetFlag(statePtr, BUFFER_READY); } - + result = FlushChannel(NULL, chanPtr, 0); if (result != 0) { - return TCL_ERROR; + return TCL_ERROR; } return TCL_OK; @@ -4800,8 +6409,8 @@ Tcl_Flush(chan) * * DiscardInputQueued -- * - * Discards any input read from the channel but not yet consumed - * by Tcl reading commands. + * Discards any input read from the channel but not yet consumed by Tcl + * reading commands. * * Results: * None. @@ -4814,32 +6423,31 @@ Tcl_Flush(chan) */ static void -DiscardInputQueued(chanPtr, discardSavedBuffers) - Channel *chanPtr; /* Channel on which to discard - * the queued input. */ - int discardSavedBuffers; /* If non-zero, discard all buffers including - * last one. */ +DiscardInputQueued( + ChannelState *statePtr, /* Channel on which to discard the queued + * input. */ + int discardSavedBuffers) /* If non-zero, discard all buffers including + * last one. */ { - ChannelBuffer *bufPtr, *nxtPtr; /* Loop variables. */ + ChannelBuffer *bufPtr, *nxtPtr; + /* Loop variables. */ - bufPtr = chanPtr->inQueueHead; - chanPtr->inQueueHead = (ChannelBuffer *) NULL; - chanPtr->inQueueTail = (ChannelBuffer *) NULL; - for (; bufPtr != (ChannelBuffer *) NULL; bufPtr = nxtPtr) { - nxtPtr = bufPtr->nextPtr; - RecycleBuffer(chanPtr, bufPtr, discardSavedBuffers); + bufPtr = statePtr->inQueueHead; + statePtr->inQueueHead = NULL; + statePtr->inQueueTail = NULL; + for (; bufPtr != NULL; bufPtr = nxtPtr) { + nxtPtr = bufPtr->nextPtr; + RecycleBuffer(statePtr, bufPtr, discardSavedBuffers); } /* * If discardSavedBuffers is nonzero, must also discard any previously * saved buffer in the saveInBufPtr field. */ - - if (discardSavedBuffers) { - if (chanPtr->saveInBufPtr != (ChannelBuffer *) NULL) { - ckfree((char *) chanPtr->saveInBufPtr); - chanPtr->saveInBufPtr = (ChannelBuffer *) NULL; - } + + if (discardSavedBuffers && statePtr->saveInBufPtr != NULL) { + ReleaseChannelBuffer(statePtr->saveInBufPtr); + statePtr->saveInBufPtr = NULL; } } @@ -4848,11 +6456,11 @@ DiscardInputQueued(chanPtr, discardSavedBuffers) * * GetInput -- * - * Reads input data from a device into a channel buffer. + * Reads input data from a device into a channel buffer. * * Results: * The return value is the Posix error code if an error occurred while - * reading from the file, or 0 otherwise. + * reading from the file, or 0 otherwise. * * Side effects: * Reads from the underlying device. @@ -4861,13 +6469,15 @@ DiscardInputQueued(chanPtr, discardSavedBuffers) */ static int -GetInput(chanPtr) - Channel *chanPtr; /* Channel to read input from. */ +GetInput( + Channel *chanPtr) /* Channel to read input from. */ { int toRead; /* How much to read? */ int result; /* Of calling driver. */ int nread; /* How much was read from channel? */ ChannelBuffer *bufPtr; /* New buffer to add to input queue. */ + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ /* * Prevent reading from a dead channel -- a channel that has been closed @@ -4875,74 +6485,163 @@ GetInput(chanPtr) * channel cleanup has run but the channel is still registered in some * interpreter. */ - - if (CheckForDeadChannel(NULL, chanPtr)) { + + if (CheckForDeadChannel(NULL, statePtr)) { return EINVAL; } /* - * See if we can fill an existing buffer. If we can, read only - * as much as will fit in it. Otherwise allocate a new buffer, - * add it to the input queue and attempt to fill it to the max. + * First check for more buffers in the pushback area of the topmost + * channel in the stack and use them. They can be the result of a + * transformation which went away without reading all the information + * placed in the area when it was stacked. + * + * Two possibilities for the state: No buffers in it, or a single empty + * buffer. In the latter case we can recycle it now. + */ + + if (chanPtr->inQueueHead != NULL) { + if (statePtr->inQueueHead != NULL) { + RecycleBuffer(statePtr, statePtr->inQueueHead, 0); + statePtr->inQueueHead = NULL; + } + + statePtr->inQueueHead = chanPtr->inQueueHead; + statePtr->inQueueTail = chanPtr->inQueueTail; + chanPtr->inQueueHead = NULL; + chanPtr->inQueueTail = NULL; + return 0; + } + + /* + * Nothing in the pushback area, fall back to the usual handling (driver, + * etc.) */ - bufPtr = chanPtr->inQueueTail; - if ((bufPtr != NULL) && (bufPtr->nextAdded < bufPtr->bufLength)) { - toRead = bufPtr->bufLength - bufPtr->nextAdded; + /* + * See if we can fill an existing buffer. If we can, read only as much as + * will fit in it. Otherwise allocate a new buffer, add it to the input + * queue and attempt to fill it to the max. + */ + + bufPtr = statePtr->inQueueTail; + if ((bufPtr != NULL) && !IsBufferFull(bufPtr)) { + toRead = SpaceLeft(bufPtr); } else { - bufPtr = chanPtr->saveInBufPtr; - chanPtr->saveInBufPtr = NULL; + bufPtr = statePtr->saveInBufPtr; + statePtr->saveInBufPtr = NULL; + + /* + * Check the actual buffersize against the requested buffersize. + * Buffers which are smaller than requested are squashed. This is done + * to honor dynamic changes of the buffersize made by the user. + */ + + if ((bufPtr != NULL) + && (bufPtr->bufLength - BUFFER_PADDING < statePtr->bufSize)) { + ReleaseChannelBuffer(bufPtr); + bufPtr = NULL; + } + if (bufPtr == NULL) { - bufPtr = AllocChannelBuffer(chanPtr->bufSize); + bufPtr = AllocChannelBuffer(statePtr->bufSize); } - bufPtr->nextPtr = (ChannelBuffer *) NULL; + bufPtr->nextPtr = NULL; - toRead = chanPtr->bufSize; - if (chanPtr->inQueueTail == NULL) { - chanPtr->inQueueHead = bufPtr; - } else { - chanPtr->inQueueTail->nextPtr = bufPtr; - } - chanPtr->inQueueTail = bufPtr; + /* + * SF #427196: Use the actual size of the buffer to determine the + * number of bytes to read from the channel and not the size for new + * buffers. They can be different if the buffersize was changed + * between reads. + * + * Note: This affects performance negatively if the buffersize was + * extended but this small buffer is reused for all subsequent reads. + * The system never uses buffers with the requested bigger size in + * that case. An adjunct patch could try and delete all unused buffers + * it encounters and which are smaller than the formally requested + * buffersize. + */ + + toRead = SpaceLeft(bufPtr); + + if (statePtr->inQueueTail == NULL) { + statePtr->inQueueHead = bufPtr; + } else { + statePtr->inQueueTail->nextPtr = bufPtr; + } + statePtr->inQueueTail = bufPtr; } - + /* * If EOF is set, we should avoid calling the driver because on some * platforms it is impossible to read from a device after EOF. */ - if (chanPtr->flags & CHANNEL_EOF) { + if (GotFlag(statePtr, CHANNEL_EOF)) { return 0; } - nread = (*chanPtr->typePtr->inputProc)(chanPtr->instanceData, - bufPtr->buf + bufPtr->nextAdded, toRead, &result); +#ifdef TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING + /* + * [Bug 943274]: Better emulation of non-blocking channels for channels + * without BlockModeProc, by keeping track of true fileevents generated by + * the OS == Data waiting and reading if and only if we are sure to have + * data. + */ + + if (GotFlag(statePtr, CHANNEL_NONBLOCKING) && + (Tcl_ChannelBlockModeProc(chanPtr->typePtr) == NULL) && + !GotFlag(statePtr, CHANNEL_HAS_MORE_DATA)) { + /* + * Bypass the driver, it would block, as no data is available + */ + + nread = -1; + result = EWOULDBLOCK; + } else +#endif /* TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING */ + { + PreserveChannelBuffer(bufPtr); + nread = ChanRead(chanPtr, InsertPoint(bufPtr), toRead, &result); + } if (nread > 0) { + result = 0; bufPtr->nextAdded += nread; /* - * If we get a short read, signal up that we may be BLOCKED. We - * should avoid calling the driver because on some platforms we - * will block in the low level reading code even though the - * channel is set into nonblocking mode. + * If we get a short read, signal up that we may be BLOCKED. We should + * avoid calling the driver because on some platforms we will block in + * the low level reading code even though the channel is set into + * nonblocking mode. */ - + if (nread < toRead) { - chanPtr->flags |= CHANNEL_BLOCKED; + SetFlag(statePtr, CHANNEL_BLOCKED); + } + +#ifdef TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING + if (nread <= toRead) { + /* + * [Bug 943274]: We have read the available data, clear flag. + */ + + ResetFlag(statePtr, CHANNEL_HAS_MORE_DATA); } +#endif /* TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING */ } else if (nread == 0) { - chanPtr->flags |= CHANNEL_EOF; - chanPtr->inputEncodingFlags |= TCL_ENCODING_END; + result = 0; + SetFlag(statePtr, CHANNEL_EOF); + statePtr->inputEncodingFlags |= TCL_ENCODING_END; } else if (nread < 0) { if ((result == EWOULDBLOCK) || (result == EAGAIN)) { - chanPtr->flags |= CHANNEL_BLOCKED; + SetFlag(statePtr, CHANNEL_BLOCKED); result = EAGAIN; } Tcl_SetErrno(result); - return result; - } - return 0; + } + ReleaseChannelBuffer(bufPtr); + return result; } /* @@ -4950,12 +6649,12 @@ GetInput(chanPtr) * * Tcl_Seek -- * - * Implements seeking on Tcl Channels. This is a public function - * so that other C facilities may be implemented on top of it. + * Implements seeking on Tcl Channels. This is a public function so that + * other C facilities may be implemented on top of it. * * Results: - * The new access point or -1 on error. If error, use Tcl_GetErrno() - * to retrieve the POSIX error code for the error that occurred. + * The new access point or -1 on error. If error, use Tcl_GetErrno() to + * retrieve the POSIX error code for the error that occurred. * * Side effects: * May flush output on the channel. May discard queued input. @@ -4963,70 +6662,66 @@ GetInput(chanPtr) *---------------------------------------------------------------------- */ -int -Tcl_Seek(chan, offset, mode) - Tcl_Channel chan; /* The channel on which to seek. */ - int offset; /* Offset to seek to. */ - int mode; /* Relative to which location to seek? */ +Tcl_WideInt +Tcl_Seek( + Tcl_Channel chan, /* The channel on which to seek. */ + Tcl_WideInt offset, /* Offset to seek to. */ + int mode) /* Relative to which location to seek? */ { - Channel *chanPtr; /* The real IO channel. */ - ChannelBuffer *bufPtr; + Channel *chanPtr = (Channel *) chan; + /* The real IO channel. */ + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ int inputBuffered, outputBuffered; + /* # bytes held in buffers. */ int result; /* Of device driver operations. */ - int curPos; /* Position on the device. */ - int wasAsync; /* Was the channel nonblocking before the - * seek operation? If so, must restore to - * nonblocking mode after the seek. */ + Tcl_WideInt curPos; /* Position on the device. */ + int wasAsync; /* Was the channel nonblocking before the seek + * operation? If so, must restore to + * non-blocking mode after the seek. */ - chanPtr = (Channel *) chan; - if (CheckChannelErrors(chanPtr, TCL_WRITABLE | TCL_READABLE) != 0) { - return -1; + if (CheckChannelErrors(statePtr, TCL_WRITABLE | TCL_READABLE) != 0) { + return Tcl_LongAsWide(-1); } /* - * Disallow seek on dead channels -- channels that have been closed but - * not yet been deallocated. Such channels can be found if the exit - * handler for channel cleanup has run but the channel is still - * registered in an interpreter. + * Disallow seek on dead channels - channels that have been closed but not + * yet been deallocated. Such channels can be found if the exit handler + * for channel cleanup has run but the channel is still registered in an + * interpreter. + */ + + if (CheckForDeadChannel(NULL, statePtr)) { + return Tcl_LongAsWide(-1); + } + + /* + * This operation should occur at the top of a channel stack. */ - if (CheckForDeadChannel(NULL,chanPtr)) return -1; + chanPtr = statePtr->topChanPtr; /* * Disallow seek on channels whose type does not have a seek procedure * defined. This means that the channel does not support seeking. */ - if (chanPtr->typePtr->seekProc == (Tcl_DriverSeekProc *) NULL) { - Tcl_SetErrno(EINVAL); - return -1; + if (chanPtr->typePtr->seekProc == NULL) { + Tcl_SetErrno(EINVAL); + return Tcl_LongAsWide(-1); } /* - * Compute how much input and output is buffered. If both input and - * output is buffered, cannot compute the current position. + * Compute how much input and output is buffered. If both input and output + * is buffered, cannot compute the current position. */ - for (bufPtr = chanPtr->inQueueHead, inputBuffered = 0; - bufPtr != (ChannelBuffer *) NULL; - bufPtr = bufPtr->nextPtr) { - inputBuffered += (bufPtr->nextAdded - bufPtr->nextRemoved); - } - for (bufPtr = chanPtr->outQueueHead, outputBuffered = 0; - bufPtr != (ChannelBuffer *) NULL; - bufPtr = bufPtr->nextPtr) { - outputBuffered += (bufPtr->nextAdded - bufPtr->nextRemoved); - } - if ((chanPtr->curOutPtr != (ChannelBuffer *) NULL) && - (chanPtr->curOutPtr->nextAdded > chanPtr->curOutPtr->nextRemoved)) { - chanPtr->flags |= BUFFER_READY; - outputBuffered += - (chanPtr->curOutPtr->nextAdded - chanPtr->curOutPtr->nextRemoved); - } + inputBuffered = Tcl_InputBuffered(chan); + outputBuffered = Tcl_OutputBuffered(chan); if ((inputBuffered != 0) && (outputBuffered != 0)) { - Tcl_SetErrno(EFAULT); - return -1; + Tcl_SetErrno(EFAULT); + return Tcl_LongAsWide(-1); } /* @@ -5035,91 +6730,88 @@ Tcl_Seek(chan, offset, mode) */ if (mode == SEEK_CUR) { - offset -= inputBuffered; + offset -= inputBuffered; } /* - * Discard any queued input - this input should not be read after - * the seek. + * Discard any queued input - this input should not be read after the + * seek. */ - DiscardInputQueued(chanPtr, 0); + DiscardInputQueued(statePtr, 0); /* - * Reset EOF and BLOCKED flags. We invalidate them by moving the - * access point. Also clear CR related flags. + * Reset EOF and BLOCKED flags. We invalidate them by moving the access + * point. Also clear CR related flags. */ - chanPtr->flags &= - (~(CHANNEL_EOF | CHANNEL_STICKY_EOF | CHANNEL_BLOCKED | INPUT_SAW_CR)); - + ResetFlag(statePtr, CHANNEL_EOF | CHANNEL_STICKY_EOF | CHANNEL_BLOCKED | + INPUT_SAW_CR); + /* - * If the channel is in asynchronous output mode, switch it back - * to synchronous mode and cancel any async flush that may be - * scheduled. After the flush, the channel will be put back into - * asynchronous output mode. + * If the channel is in asynchronous output mode, switch it back to + * synchronous mode and cancel any async flush that may be scheduled. + * After the flush, the channel will be put back into asynchronous output + * mode. */ wasAsync = 0; - if (chanPtr->flags & CHANNEL_NONBLOCKING) { - wasAsync = 1; - result = 0; - if (chanPtr->typePtr->blockModeProc != NULL) { - result = (chanPtr->typePtr->blockModeProc) (chanPtr->instanceData, - TCL_MODE_BLOCKING); - } - if (result != 0) { - Tcl_SetErrno(result); - return -1; - } - chanPtr->flags &= (~(CHANNEL_NONBLOCKING)); - if (chanPtr->flags & BG_FLUSH_SCHEDULED) { - chanPtr->flags &= (~(BG_FLUSH_SCHEDULED)); - } + if (GotFlag(statePtr, CHANNEL_NONBLOCKING)) { + wasAsync = 1; + result = StackSetBlockMode(chanPtr, TCL_MODE_BLOCKING); + if (result != 0) { + return Tcl_LongAsWide(-1); + } + ResetFlag(statePtr, CHANNEL_NONBLOCKING); + if (GotFlag(statePtr, BG_FLUSH_SCHEDULED)) { + ResetFlag(statePtr, BG_FLUSH_SCHEDULED); + } + } + + /* + * If there is data buffered in statePtr->curOutPtr then mark the channel + * as ready to flush before invoking FlushChannel. + */ + + if ((statePtr->curOutPtr != NULL) && IsBufferReady(statePtr->curOutPtr)) { + SetFlag(statePtr, BUFFER_READY); } - + /* - * If the flush fails we cannot recover the original position. In - * that case the seek is not attempted because we do not know where - * the access position is - instead we return the error. FlushChannel - * has already called Tcl_SetErrno() to report the error upwards. - * If the flush succeeds we do the seek also. + * If the flush fails we cannot recover the original position. In that + * case the seek is not attempted because we do not know where the access + * position is - instead we return the error. FlushChannel has already + * called Tcl_SetErrno() to report the error upwards. If the flush + * succeeds we do the seek also. */ - + if (FlushChannel(NULL, chanPtr, 0) != 0) { - curPos = -1; + curPos = -1; } else { + /* + * Now seek to the new position in the channel as requested by the + * caller. + */ - /* - * Now seek to the new position in the channel as requested by the - * caller. - */ - - curPos = (chanPtr->typePtr->seekProc) (chanPtr->instanceData, - (long) offset, mode, &result); - if (curPos == -1) { - Tcl_SetErrno(result); - } + curPos = ChanSeek(chanPtr, offset, mode, &result); + if (curPos == Tcl_LongAsWide(-1)) { + Tcl_SetErrno(result); + } } - + /* * Restore to nonblocking mode if that was the previous behavior. * - * NOTE: Even if there was an async flush active we do not restore - * it now because we already flushed all the queued output, above. + * NOTE: Even if there was an async flush active we do not restore it now + * because we already flushed all the queued output, above. */ - + if (wasAsync) { - chanPtr->flags |= CHANNEL_NONBLOCKING; - result = 0; - if (chanPtr->typePtr->blockModeProc != NULL) { - result = (chanPtr->typePtr->blockModeProc) (chanPtr->instanceData, - TCL_MODE_NONBLOCKING); - } - if (result != 0) { - Tcl_SetErrno(result); - return -1; - } + SetFlag(statePtr, CHANNEL_NONBLOCKING); + result = StackSetBlockMode(chanPtr, TCL_MODE_NONBLOCKING); + if (result != 0) { + return Tcl_LongAsWide(-1); + } } return curPos; @@ -5130,13 +6822,13 @@ Tcl_Seek(chan, offset, mode) * * Tcl_Tell -- * - * Returns the position of the next character to be read/written on - * this channel. + * Returns the position of the next character to be read/written on this + * channel. * * Results: - * A nonnegative integer on success, -1 on failure. If failed, - * use Tcl_GetErrno() to retrieve the POSIX error code for the - * error that occurred. + * A nonnegative integer on success, -1 on failure. If failed, use + * Tcl_GetErrno() to retrieve the POSIX error code for the error that + * occurred. * * Side effects: * None. @@ -5144,84 +6836,187 @@ Tcl_Seek(chan, offset, mode) *---------------------------------------------------------------------- */ -int -Tcl_Tell(chan) - Tcl_Channel chan; /* The channel to return pos for. */ +Tcl_WideInt +Tcl_Tell( + Tcl_Channel chan) /* The channel to return pos for. */ { - Channel *chanPtr; /* The actual channel to tell on. */ - ChannelBuffer *bufPtr; + Channel *chanPtr = (Channel *) chan; + /* The real IO channel. */ + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ int inputBuffered, outputBuffered; - int result; /* Of calling device driver. */ - int curPos; /* Position on device. */ + /* # bytes held in buffers. */ + int result; /* Of calling device driver. */ + Tcl_WideInt curPos; /* Position on device. */ - chanPtr = (Channel *) chan; - if (CheckChannelErrors(chanPtr, TCL_WRITABLE | TCL_READABLE) != 0) { - return -1; + if (CheckChannelErrors(statePtr, TCL_WRITABLE | TCL_READABLE) != 0) { + return Tcl_LongAsWide(-1); } /* * Disallow tell on dead channels -- channels that have been closed but * not yet been deallocated. Such channels can be found if the exit - * handler for channel cleanup has run but the channel is still - * registered in an interpreter. + * handler for channel cleanup has run but the channel is still registered + * in an interpreter. */ - if (CheckForDeadChannel(NULL,chanPtr)) { - return -1; + if (CheckForDeadChannel(NULL, statePtr)) { + return Tcl_LongAsWide(-1); } /* + * This operation should occur at the top of a channel stack. + */ + + chanPtr = statePtr->topChanPtr; + + /* * Disallow tell on channels whose type does not have a seek procedure * defined. This means that the channel does not support seeking. */ - if (chanPtr->typePtr->seekProc == (Tcl_DriverSeekProc *) NULL) { - Tcl_SetErrno(EINVAL); - return -1; + if (chanPtr->typePtr->seekProc == NULL) { + Tcl_SetErrno(EINVAL); + return Tcl_LongAsWide(-1); } /* - * Compute how much input and output is buffered. If both input and - * output is buffered, cannot compute the current position. + * Compute how much input and output is buffered. If both input and output + * is buffered, cannot compute the current position. */ - for (bufPtr = chanPtr->inQueueHead, inputBuffered = 0; - bufPtr != (ChannelBuffer *) NULL; - bufPtr = bufPtr->nextPtr) { - inputBuffered += (bufPtr->nextAdded - bufPtr->nextRemoved); + inputBuffered = Tcl_InputBuffered(chan); + outputBuffered = Tcl_OutputBuffered(chan); + + /* + * Get the current position in the device and compute the position where + * the next character will be read or written. Note that we prefer the + * wideSeekProc if that is available and non-NULL... + */ + + curPos = ChanSeek(chanPtr, Tcl_LongAsWide(0), SEEK_CUR, &result); + if (curPos == Tcl_LongAsWide(-1)) { + Tcl_SetErrno(result); + return Tcl_LongAsWide(-1); } - for (bufPtr = chanPtr->outQueueHead, outputBuffered = 0; - bufPtr != (ChannelBuffer *) NULL; - bufPtr = bufPtr->nextPtr) { - outputBuffered += (bufPtr->nextAdded - bufPtr->nextRemoved); + + if (inputBuffered != 0) { + return curPos - inputBuffered; } - if ((chanPtr->curOutPtr != (ChannelBuffer *) NULL) && - (chanPtr->curOutPtr->nextAdded > chanPtr->curOutPtr->nextRemoved)) { - chanPtr->flags |= BUFFER_READY; - outputBuffered += - (chanPtr->curOutPtr->nextAdded - chanPtr->curOutPtr->nextRemoved); + return curPos + outputBuffered; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_SeekOld, Tcl_TellOld -- + * + * Backward-compatability versions of the seek/tell interface that do not + * support 64-bit offsets. This interface is not documented or expected + * to be supported indefinitely. + * + * Results: + * As for Tcl_Seek and Tcl_Tell respectively, except truncated to + * whatever value will fit in an 'int'. + * + * Side effects: + * As for Tcl_Seek and Tcl_Tell respectively. + * + *--------------------------------------------------------------------------- + */ + +int +Tcl_SeekOld( + Tcl_Channel chan, /* The channel on which to seek. */ + int offset, /* Offset to seek to. */ + int mode) /* Relative to which location to seek? */ +{ + Tcl_WideInt wOffset, wResult; + + wOffset = Tcl_LongAsWide((long) offset); + wResult = Tcl_Seek(chan, wOffset, mode); + return (int) Tcl_WideAsLong(wResult); +} + +int +Tcl_TellOld( + Tcl_Channel chan) /* The channel to return pos for. */ +{ + Tcl_WideInt wResult = Tcl_Tell(chan); + + return (int) Tcl_WideAsLong(wResult); +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_TruncateChannel -- + * + * Truncate a channel to the given length. + * + * Results: + * TCL_OK on success, TCL_ERROR if the operation failed (e.g. is not + * supported by the type of channel, or the underlying OS operation + * failed in some way). + * + * Side effects: + * Seeks the channel to the current location. Sets errno on OS error. + * + *--------------------------------------------------------------------------- + */ + +int +Tcl_TruncateChannel( + Tcl_Channel chan, /* Channel to truncate. */ + Tcl_WideInt length) /* Length to truncate it to. */ +{ + Channel *chanPtr = (Channel *) chan; + Tcl_DriverTruncateProc *truncateProc = + Tcl_ChannelTruncateProc(chanPtr->typePtr); + int result; + + if (truncateProc == NULL) { + /* + * Feature not supported and it's not emulatable. Pretend it's + * returned an EINVAL, a very generic error! + */ + + Tcl_SetErrno(EINVAL); + return TCL_ERROR; } - if ((inputBuffered != 0) && (outputBuffered != 0)) { - Tcl_SetErrno(EFAULT); - return -1; + if (!GotFlag(chanPtr->state, TCL_WRITABLE)) { + /* + * We require that the file was opened of writing. Do that check now + * so that we only flush if we think we're going to succeed. + */ + + Tcl_SetErrno(EINVAL); + return TCL_ERROR; } /* - * Get the current position in the device and compute the position - * where the next character will be read or written. + * Seek first to force a total flush of all pending buffers and ditch any + * pre-read input data. */ - curPos = (chanPtr->typePtr->seekProc) (chanPtr->instanceData, - (long) 0, SEEK_CUR, &result); - if (curPos == -1) { - Tcl_SetErrno(result); - return -1; + WillWrite(chanPtr); + + if (WillRead(chanPtr) < 0) { + return TCL_ERROR; } - if (inputBuffered != 0) { - return (curPos - inputBuffered); + + /* + * We're all flushed to disk now and we also don't have any unfortunate + * input baggage around either; can truncate with impunity. + */ + + result = truncateProc(chanPtr->instanceData, length); + if (result != 0) { + Tcl_SetErrno(result); + return TCL_ERROR; } - return (curPos + outputBuffered); + return TCL_OK; } /* @@ -5229,65 +7024,94 @@ Tcl_Tell(chan) * * CheckChannelErrors -- * - * See if the channel is in an ready state and can perform the - * desired operation. + * See if the channel is in an ready state and can perform the desired + * operation. * * Results: - * The return value is 0 if the channel is OK, otherwise the - * return value is -1 and errno is set to indicate the error. + * The return value is 0 if the channel is OK, otherwise the return value + * is -1 and errno is set to indicate the error. * * Side effects: * May clear the EOF and/or BLOCKED bits if reading from channel. * *--------------------------------------------------------------------------- */ - + static int -CheckChannelErrors(chanPtr, direction) - Channel *chanPtr; /* Channel to check. */ - int direction; /* Test if channel supports desired operation: - * TCL_READABLE, TCL_WRITABLE. */ +CheckChannelErrors( + ChannelState *statePtr, /* Channel to check. */ + int flags) /* Test if channel supports desired operation: + * TCL_READABLE, TCL_WRITABLE. Also indicates + * Raw read or write for special close + * processing */ { + int direction = flags & (TCL_READABLE|TCL_WRITABLE); + /* * Check for unreported error. */ - if (chanPtr->unreportedError != 0) { - Tcl_SetErrno(chanPtr->unreportedError); - chanPtr->unreportedError = 0; - return -1; + if (statePtr->unreportedError != 0) { + Tcl_SetErrno(statePtr->unreportedError); + statePtr->unreportedError = 0; + + /* + * TIP #219, Tcl Channel Reflection API. + * Move a defered error message back into the channel bypass. + */ + + if (statePtr->chanMsg != NULL) { + TclDecrRefCount(statePtr->chanMsg); + } + statePtr->chanMsg = statePtr->unreportedMsg; + statePtr->unreportedMsg = NULL; + return -1; + } + + /* + * Only the raw read and write operations are allowed during close in + * order to drain data from stacked channels. + */ + + if (GotFlag(statePtr, CHANNEL_CLOSED) && !(flags & CHANNEL_RAW_MODE)) { + Tcl_SetErrno(EACCES); + return -1; } /* * Fail if the channel is not opened for desired operation. */ - if ((chanPtr->flags & direction) == 0) { - Tcl_SetErrno(EACCES); - return -1; + if ((statePtr->flags & direction) == 0) { + Tcl_SetErrno(EACCES); + return -1; } /* * Fail if the channel is in the middle of a background copy. + * + * Don't do this tests for raw channels here or else the chaining in the + * transformation drivers will fail with 'file busy' error instead of + * retrieving and transforming the data to copy. */ - if (chanPtr->csPtr != NULL) { + if (BUSY_STATE(statePtr, flags) && ((flags & CHANNEL_RAW_MODE) == 0)) { Tcl_SetErrno(EBUSY); return -1; } if (direction == TCL_READABLE) { /* - * If we have not encountered a sticky EOF, clear the EOF bit - * (sticky EOF is set if we have seen the input eofChar, to prevent - * reading beyond the eofChar). Also, always clear the BLOCKED bit. - * We want to discover these conditions anew in each operation. + * If we have not encountered a sticky EOF, clear the EOF bit (sticky + * EOF is set if we have seen the input eofChar, to prevent reading + * beyond the eofChar). Also, always clear the BLOCKED bit. We want to + * discover these conditions anew in each operation. */ - - if ((chanPtr->flags & CHANNEL_STICKY_EOF) == 0) { - chanPtr->flags &= ~CHANNEL_EOF; + + if (!GotFlag(statePtr, CHANNEL_STICKY_EOF)) { + ResetFlag(statePtr, CHANNEL_EOF); } - chanPtr->flags &= ~(CHANNEL_BLOCKED | CHANNEL_NEED_MORE_DATA); + ResetFlag(statePtr, CHANNEL_BLOCKED | CHANNEL_NEED_MORE_DATA); } return 0; @@ -5310,15 +7134,15 @@ CheckChannelErrors(chanPtr, direction) */ int -Tcl_Eof(chan) - Tcl_Channel chan; /* Does this channel have EOF? */ +Tcl_Eof( + Tcl_Channel chan) /* Does this channel have EOF? */ { - Channel *chanPtr; /* The real channel structure. */ + ChannelState *statePtr = ((Channel *) chan)->state; + /* State of real channel structure. */ - chanPtr = (Channel *) chan; - return ((chanPtr->flags & CHANNEL_STICKY_EOF) || - ((chanPtr->flags & CHANNEL_EOF) && (Tcl_InputBuffered(chan) == 0))) - ? 1 : 0; + return (GotFlag(statePtr, CHANNEL_STICKY_EOF) || + (GotFlag(statePtr, CHANNEL_EOF) && + (Tcl_InputBuffered(chan) == 0))) ? 1 : 0; } /* @@ -5338,13 +7162,13 @@ Tcl_Eof(chan) */ int -Tcl_InputBlocked(chan) - Tcl_Channel chan; /* Is this channel blocked? */ +Tcl_InputBlocked( + Tcl_Channel chan) /* Is this channel blocked? */ { - Channel *chanPtr; /* The real channel structure. */ + ChannelState *statePtr = ((Channel *) chan)->state; + /* State of real channel structure. */ - chanPtr = (Channel *) chan; - return (chanPtr->flags & CHANNEL_BLOCKED) ? 1 : 0; + return GotFlag(statePtr, CHANNEL_BLOCKED) ? 1 : 0; } /* @@ -5352,12 +7176,12 @@ Tcl_InputBlocked(chan) * * Tcl_InputBuffered -- * - * Returns the number of bytes of input currently buffered in the + * Returns the number of bytes of input currently buffered in the common * internal buffer of a channel. * * Results: - * The number of input bytes buffered, or zero if the channel is not - * open for reading. + * The number of input bytes buffered, or zero if the channel is not open + * for reading. * * Side effects: * None. @@ -5366,19 +7190,105 @@ Tcl_InputBlocked(chan) */ int -Tcl_InputBuffered(chan) - Tcl_Channel chan; /* The channel to query. */ +Tcl_InputBuffered( + Tcl_Channel chan) /* The channel to query. */ { - Channel *chanPtr; + ChannelState *statePtr = ((Channel *) chan)->state; + /* State of real channel structure. */ + ChannelBuffer *bufPtr; + int bytesBuffered; + + for (bytesBuffered = 0, bufPtr = statePtr->inQueueHead; bufPtr != NULL; + bufPtr = bufPtr->nextPtr) { + bytesBuffered += BytesLeft(bufPtr); + } + + /* + * Don't forget the bytes in the topmost pushback area. + */ + + for (bufPtr = statePtr->topChanPtr->inQueueHead; bufPtr != NULL; + bufPtr = bufPtr->nextPtr) { + bytesBuffered += BytesLeft(bufPtr); + } + + return bytesBuffered; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_OutputBuffered -- + * + * Returns the number of bytes of output currently buffered in the common + * internal buffer of a channel. + * + * Results: + * The number of output bytes buffered, or zero if the channel is not open + * for writing. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_OutputBuffered( + Tcl_Channel chan) /* The channel to query. */ +{ + ChannelState *statePtr = ((Channel *) chan)->state; + /* State of real channel structure. */ + ChannelBuffer *bufPtr; int bytesBuffered; + + for (bytesBuffered = 0, bufPtr = statePtr->outQueueHead; bufPtr != NULL; + bufPtr = bufPtr->nextPtr) { + bytesBuffered += BytesLeft(bufPtr); + } + if (statePtr->curOutPtr != NULL) { + register ChannelBuffer *curOutPtr = statePtr->curOutPtr; + + if (IsBufferReady(curOutPtr)) { + bytesBuffered += BytesLeft(curOutPtr); + } + } + + return bytesBuffered; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelBuffered -- + * + * Returns the number of bytes of input currently buffered in the + * internal buffer (push back area) of a channel. + * + * Results: + * The number of input bytes buffered, or zero if the channel is not open + * for reading. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_ChannelBuffered( + Tcl_Channel chan) /* The channel to query. */ +{ + Channel *chanPtr = (Channel *) chan; + /* Real channel structure. */ ChannelBuffer *bufPtr; + int bytesBuffered = 0; - chanPtr = (Channel *) chan; - for (bytesBuffered = 0, bufPtr = chanPtr->inQueueHead; - bufPtr != (ChannelBuffer *) NULL; - bufPtr = bufPtr->nextPtr) { - bytesBuffered += (bufPtr->nextAdded - bufPtr->nextRemoved); + for (bufPtr = chanPtr->inQueueHead; bufPtr != NULL; + bufPtr = bufPtr->nextPtr) { + bytesBuffered += BytesLeft(bufPtr); } + return bytesBuffered; } @@ -5387,8 +7297,8 @@ Tcl_InputBuffered(chan) * * Tcl_SetChannelBufferSize -- * - * Sets the size of buffers to allocate to store input or output - * in the channel. The size must be between 10 bytes and 1 MByte. + * Sets the size of buffers to allocate to store input or output in the + * channel. The size must be between 1 byte and 1 MByte. * * Results: * None. @@ -5400,36 +7310,24 @@ Tcl_InputBuffered(chan) */ void -Tcl_SetChannelBufferSize(chan, sz) - Tcl_Channel chan; /* The channel whose buffer size - * to set. */ - int sz; /* The size to set. */ +Tcl_SetChannelBufferSize( + Tcl_Channel chan, /* The channel whose buffer size to set. */ + int sz) /* The size to set. */ { - Channel *chanPtr; - + ChannelState *statePtr; /* State of real channel structure. */ + /* - * If the buffer size is smaller than 10 bytes or larger than one MByte, - * do not accept the requested size and leave the current buffer size. + * Clip the buffer size to force it into the [1,1M] range */ - - if (sz < 10) { - return; - } - if (sz > (1024 * 1024)) { - return; - } - - chanPtr = (Channel *) chan; - chanPtr->bufSize = sz; - if (chanPtr->outputStage != NULL) { - ckfree((char *) chanPtr->outputStage); - chanPtr->outputStage = NULL; - } - if ((chanPtr->encoding != NULL) && (chanPtr->flags & TCL_WRITABLE)) { - chanPtr->outputStage = (char *) - ckalloc((unsigned) (chanPtr->bufSize + 2)); + if (sz < 1) { + sz = 1; + } else if (sz > MAX_CHANNEL_BUFFER_SIZE) { + sz = MAX_CHANNEL_BUFFER_SIZE; } + + statePtr = ((Channel *) chan)->state; + statePtr->bufSize = sz; } /* @@ -5449,14 +7347,14 @@ Tcl_SetChannelBufferSize(chan, sz) */ int -Tcl_GetChannelBufferSize(chan) - Tcl_Channel chan; /* The channel for which to find the - * buffer size. */ +Tcl_GetChannelBufferSize( + Tcl_Channel chan) /* The channel for which to find the buffer + * size. */ { - Channel *chanPtr; + ChannelState *statePtr = ((Channel *) chan)->state; + /* State of real channel structure. */ - chanPtr = (Channel *) chan; - return chanPtr->bufSize; + return statePtr->bufSize; } /* @@ -5464,66 +7362,67 @@ Tcl_GetChannelBufferSize(chan) * * Tcl_BadChannelOption -- * - * This procedure generates a "bad option" error message in an - * (optional) interpreter. It is used by channel drivers when - * a invalid Set/Get option is requested. Its purpose is to concatenate - * the generic options list to the specific ones and factorize - * the generic options error message string. + * This procedure generates a "bad option" error message in an (optional) + * interpreter. It is used by channel drivers when a invalid Set/Get + * option is requested. Its purpose is to concatenate the generic options + * list to the specific ones and factorize the generic options error + * message string. * * Results: * TCL_ERROR. * * Side effects: - * An error message is generated in interp's result object to - * indicate that a command was invoked with the a bad option - * The message has the form - * bad option "blah": should be one of - * <...generic options...>+<...specific options...> - * "blah" is the optionName argument and "<specific options>" - * is a space separated list of specific option words. - * The function takes good care of inserting minus signs before - * each option, commas after, and an "or" before the last option. + + * An error message is generated in interp's result object to indicate + * that a command was invoked with the a bad option. The message has the + * form: + * bad option "blah": should be one of + * <...generic options...>+<...specific options...> + * "blah" is the optionName argument and "<specific options>" is a space + * separated list of specific option words. The function takes good care + * of inserting minus signs before each option, commas after, and an "or" + * before the last option. * *---------------------------------------------------------------------- */ int -Tcl_BadChannelOption(interp, optionName, optionList) - Tcl_Interp *interp; /* Current interpreter. (can be NULL)*/ - char *optionName; /* 'bad option' name */ - char *optionList; /* Specific options list to append - * to the standard generic options. - * can be NULL for generic options - * only. - */ +Tcl_BadChannelOption( + Tcl_Interp *interp, /* Current interpreter (can be NULL).*/ + const char *optionName, /* 'bad option' name */ + const char *optionList) /* Specific options list to append to the + * standard generic options. Can be NULL for + * generic options only. */ { - if (interp) { - CONST char *genericopt = - "blocking buffering buffersize encoding eofchar translation"; - char **argv; - int argc, i; + if (interp != NULL) { + const char *genericopt = + "blocking buffering buffersize encoding eofchar translation"; + const char **argv; + int argc, i; Tcl_DString ds; + Tcl_Obj *errObj; Tcl_DStringInit(&ds); - Tcl_DStringAppend(&ds, (char *) genericopt, -1); + Tcl_DStringAppend(&ds, genericopt, -1); if (optionList && (*optionList)) { - Tcl_DStringAppend(&ds, " ", 1); + TclDStringAppendLiteral(&ds, " "); Tcl_DStringAppend(&ds, optionList, -1); } - if (Tcl_SplitList(interp, Tcl_DStringValue(&ds), - &argc, &argv) != TCL_OK) { - panic("malformed option list in channel driver"); + if (Tcl_SplitList(interp, Tcl_DStringValue(&ds), + &argc, &argv) != TCL_OK) { + Tcl_Panic("malformed option list in channel driver"); } Tcl_ResetResult(interp); - Tcl_AppendResult(interp, "bad option \"", optionName, - "\": should be one of ", (char *) NULL); + errObj = Tcl_ObjPrintf("bad option \"%s\": should be one of ", + optionName); argc--; for (i = 0; i < argc; i++) { - Tcl_AppendResult(interp, "-", argv[i], ", ", (char *) NULL); + Tcl_AppendPrintfToObj(errObj, "-%s, ", argv[i]); } - Tcl_AppendResult(interp, "or -", argv[i], (char *) NULL); + Tcl_AppendPrintfToObj(errObj, "or -%s", argv[i]); + Tcl_SetObjResult(interp, errObj); Tcl_DStringFree(&ds); - ckfree((char *) argv); + ckfree(argv); } Tcl_SetErrno(EINVAL); return TCL_ERROR; @@ -5534,215 +7433,229 @@ Tcl_BadChannelOption(interp, optionName, optionList) * * Tcl_GetChannelOption -- * - * Gets a mode associated with an IO channel. If the optionName arg - * is non NULL, retrieves the value of that option. If the optionName - * arg is NULL, retrieves a list of alternating option names and - * values for the given channel. + * Gets a mode associated with an IO channel. If the optionName arg is + * non NULL, retrieves the value of that option. If the optionName arg is + * NULL, retrieves a list of alternating option names and values for the + * given channel. * * Results: - * A standard Tcl result. Also sets the supplied DString to the - * string value of the option(s) returned. + * A standard Tcl result. Also sets the supplied DString to the string + * value of the option(s) returned. * * Side effects: - * None. + * None. * *---------------------------------------------------------------------- */ int -Tcl_GetChannelOption(interp, chan, optionName, dsPtr) - Tcl_Interp *interp; /* For error reporting - can be NULL. */ - Tcl_Channel chan; /* Channel on which to get option. */ - char *optionName; /* Option to get. */ - Tcl_DString *dsPtr; /* Where to store value(s). */ +Tcl_GetChannelOption( + Tcl_Interp *interp, /* For error reporting - can be NULL. */ + Tcl_Channel chan, /* Channel on which to get option. */ + const char *optionName, /* Option to get. */ + Tcl_DString *dsPtr) /* Where to store value(s). */ { size_t len; /* Length of optionName string. */ char optionVal[128]; /* Buffer for sprintf. */ Channel *chanPtr = (Channel *) chan; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ int flags; /* - * If we are in the middle of a background copy, use the saved flags. + * Disallow options on dead channels -- channels that have been closed but + * not yet been deallocated. Such channels can be found if the exit + * handler for channel cleanup has run but the channel is still registered + * in an interpreter. */ - if (chanPtr->csPtr) { - if (chanPtr == chanPtr->csPtr->readPtr) { - flags = chanPtr->csPtr->readFlags; - } else { - flags = chanPtr->csPtr->writeFlags; - } - } else { - flags = chanPtr->flags; + if (CheckForDeadChannel(interp, statePtr)) { + return TCL_ERROR; } /* - * Disallow options on dead channels -- channels that have been closed but - * not yet been deallocated. Such channels can be found if the exit - * handler for channel cleanup has run but the channel is still - * registered in an interpreter. + * This operation should occur at the top of a channel stack. */ - if (CheckForDeadChannel(interp,chanPtr)) return TCL_ERROR; + chanPtr = statePtr->topChanPtr; /* - * If the optionName is NULL it means that we want a list of all - * options and values. + * If we are in the middle of a background copy, use the saved flags. */ - - if (optionName == (char *) NULL) { - len = 0; + + if (statePtr->csPtrR) { + flags = statePtr->csPtrR->readFlags; + } else if (statePtr->csPtrW) { + flags = statePtr->csPtrW->writeFlags; } else { - len = strlen(optionName); + flags = statePtr->flags; } - - if ((len == 0) || ((len > 2) && (optionName[1] == 'b') && - (strncmp(optionName, "-blocking", len) == 0))) { - if (len == 0) { - Tcl_DStringAppendElement(dsPtr, "-blocking"); - } - Tcl_DStringAppendElement(dsPtr, + + /* + * If the optionName is NULL it means that we want a list of all options + * and values. + */ + + if (optionName == NULL) { + len = 0; + } else { + len = strlen(optionName); + } + + if (len == 0 || HaveOpt(2, "-blocking")) { + if (len == 0) { + Tcl_DStringAppendElement(dsPtr, "-blocking"); + } + Tcl_DStringAppendElement(dsPtr, (flags & CHANNEL_NONBLOCKING) ? "0" : "1"); - if (len > 0) { - return TCL_OK; - } + if (len > 0) { + return TCL_OK; + } } - if ((len == 0) || ((len > 7) && (optionName[1] == 'b') && - (strncmp(optionName, "-buffering", len) == 0))) { - if (len == 0) { - Tcl_DStringAppendElement(dsPtr, "-buffering"); - } - if (flags & CHANNEL_LINEBUFFERED) { - Tcl_DStringAppendElement(dsPtr, "line"); - } else if (flags & CHANNEL_UNBUFFERED) { - Tcl_DStringAppendElement(dsPtr, "none"); - } else { - Tcl_DStringAppendElement(dsPtr, "full"); - } - if (len > 0) { - return TCL_OK; - } + if (len == 0 || HaveOpt(7, "-buffering")) { + if (len == 0) { + Tcl_DStringAppendElement(dsPtr, "-buffering"); + } + if (flags & CHANNEL_LINEBUFFERED) { + Tcl_DStringAppendElement(dsPtr, "line"); + } else if (flags & CHANNEL_UNBUFFERED) { + Tcl_DStringAppendElement(dsPtr, "none"); + } else { + Tcl_DStringAppendElement(dsPtr, "full"); + } + if (len > 0) { + return TCL_OK; + } } - if ((len == 0) || ((len > 7) && (optionName[1] == 'b') && - (strncmp(optionName, "-buffersize", len) == 0))) { - if (len == 0) { - Tcl_DStringAppendElement(dsPtr, "-buffersize"); - } - TclFormatInt(optionVal, chanPtr->bufSize); - Tcl_DStringAppendElement(dsPtr, optionVal); - if (len > 0) { - return TCL_OK; - } + if (len == 0 || HaveOpt(7, "-buffersize")) { + if (len == 0) { + Tcl_DStringAppendElement(dsPtr, "-buffersize"); + } + TclFormatInt(optionVal, statePtr->bufSize); + Tcl_DStringAppendElement(dsPtr, optionVal); + if (len > 0) { + return TCL_OK; + } } - if ((len == 0) || - ((len > 2) && (optionName[1] == 'e') && - (strncmp(optionName, "-encoding", len) == 0))) { + if (len == 0 || HaveOpt(2, "-encoding")) { if (len == 0) { Tcl_DStringAppendElement(dsPtr, "-encoding"); } - if (chanPtr->encoding == NULL) { + if (statePtr->encoding == NULL) { Tcl_DStringAppendElement(dsPtr, "binary"); } else { Tcl_DStringAppendElement(dsPtr, - Tcl_GetEncodingName(chanPtr->encoding)); + Tcl_GetEncodingName(statePtr->encoding)); } if (len > 0) { return TCL_OK; } } - if ((len == 0) || - ((len > 2) && (optionName[1] == 'e') && - (strncmp(optionName, "-eofchar", len) == 0))) { - if (len == 0) { - Tcl_DStringAppendElement(dsPtr, "-eofchar"); - } - if (((flags & (TCL_READABLE|TCL_WRITABLE)) == - (TCL_READABLE|TCL_WRITABLE)) && (len == 0)) { - Tcl_DStringStartSublist(dsPtr); - } - if (flags & TCL_READABLE) { - if (chanPtr->inEofChar == 0) { - Tcl_DStringAppendElement(dsPtr, ""); - } else { - char buf[4]; - - sprintf(buf, "%c", chanPtr->inEofChar); - Tcl_DStringAppendElement(dsPtr, buf); - } - } - if (flags & TCL_WRITABLE) { - if (chanPtr->outEofChar == 0) { - Tcl_DStringAppendElement(dsPtr, ""); - } else { - char buf[4]; - - sprintf(buf, "%c", chanPtr->outEofChar); - Tcl_DStringAppendElement(dsPtr, buf); - } - } - if (((flags & (TCL_READABLE|TCL_WRITABLE)) == - (TCL_READABLE|TCL_WRITABLE)) && (len == 0)) { - Tcl_DStringEndSublist(dsPtr); - } - if (len > 0) { - return TCL_OK; - } + if (len == 0 || HaveOpt(2, "-eofchar")) { + if (len == 0) { + Tcl_DStringAppendElement(dsPtr, "-eofchar"); + } + if (((flags & (TCL_READABLE|TCL_WRITABLE)) == + (TCL_READABLE|TCL_WRITABLE)) && (len == 0)) { + Tcl_DStringStartSublist(dsPtr); + } + if (flags & TCL_READABLE) { + if (statePtr->inEofChar == 0) { + Tcl_DStringAppendElement(dsPtr, ""); + } else { + char buf[4]; + + sprintf(buf, "%c", statePtr->inEofChar); + Tcl_DStringAppendElement(dsPtr, buf); + } + } + if (flags & TCL_WRITABLE) { + if (statePtr->outEofChar == 0) { + Tcl_DStringAppendElement(dsPtr, ""); + } else { + char buf[4]; + + sprintf(buf, "%c", statePtr->outEofChar); + Tcl_DStringAppendElement(dsPtr, buf); + } + } + if (!(flags & (TCL_READABLE|TCL_WRITABLE))) { + /* + * Not readable or writable (e.g. server socket) + */ + + Tcl_DStringAppendElement(dsPtr, ""); + } + if (((flags & (TCL_READABLE|TCL_WRITABLE)) == + (TCL_READABLE|TCL_WRITABLE)) && (len == 0)) { + Tcl_DStringEndSublist(dsPtr); + } + if (len > 0) { + return TCL_OK; + } } - if ((len == 0) || - ((len > 1) && (optionName[1] == 't') && - (strncmp(optionName, "-translation", len) == 0))) { - if (len == 0) { - Tcl_DStringAppendElement(dsPtr, "-translation"); - } - if (((flags & (TCL_READABLE|TCL_WRITABLE)) == - (TCL_READABLE|TCL_WRITABLE)) && (len == 0)) { - Tcl_DStringStartSublist(dsPtr); - } - if (flags & TCL_READABLE) { - if (chanPtr->inputTranslation == TCL_TRANSLATE_AUTO) { - Tcl_DStringAppendElement(dsPtr, "auto"); - } else if (chanPtr->inputTranslation == TCL_TRANSLATE_CR) { - Tcl_DStringAppendElement(dsPtr, "cr"); - } else if (chanPtr->inputTranslation == TCL_TRANSLATE_CRLF) { - Tcl_DStringAppendElement(dsPtr, "crlf"); - } else { - Tcl_DStringAppendElement(dsPtr, "lf"); - } - } - if (flags & TCL_WRITABLE) { - if (chanPtr->outputTranslation == TCL_TRANSLATE_AUTO) { - Tcl_DStringAppendElement(dsPtr, "auto"); - } else if (chanPtr->outputTranslation == TCL_TRANSLATE_CR) { - Tcl_DStringAppendElement(dsPtr, "cr"); - } else if (chanPtr->outputTranslation == TCL_TRANSLATE_CRLF) { - Tcl_DStringAppendElement(dsPtr, "crlf"); - } else { - Tcl_DStringAppendElement(dsPtr, "lf"); - } - } - if (((flags & (TCL_READABLE|TCL_WRITABLE)) == - (TCL_READABLE|TCL_WRITABLE)) && (len == 0)) { - Tcl_DStringEndSublist(dsPtr); - } - if (len > 0) { - return TCL_OK; - } + if (len == 0 || HaveOpt(1, "-translation")) { + if (len == 0) { + Tcl_DStringAppendElement(dsPtr, "-translation"); + } + if (((flags & (TCL_READABLE|TCL_WRITABLE)) == + (TCL_READABLE|TCL_WRITABLE)) && (len == 0)) { + Tcl_DStringStartSublist(dsPtr); + } + if (flags & TCL_READABLE) { + if (statePtr->inputTranslation == TCL_TRANSLATE_AUTO) { + Tcl_DStringAppendElement(dsPtr, "auto"); + } else if (statePtr->inputTranslation == TCL_TRANSLATE_CR) { + Tcl_DStringAppendElement(dsPtr, "cr"); + } else if (statePtr->inputTranslation == TCL_TRANSLATE_CRLF) { + Tcl_DStringAppendElement(dsPtr, "crlf"); + } else { + Tcl_DStringAppendElement(dsPtr, "lf"); + } + } + if (flags & TCL_WRITABLE) { + if (statePtr->outputTranslation == TCL_TRANSLATE_AUTO) { + Tcl_DStringAppendElement(dsPtr, "auto"); + } else if (statePtr->outputTranslation == TCL_TRANSLATE_CR) { + Tcl_DStringAppendElement(dsPtr, "cr"); + } else if (statePtr->outputTranslation == TCL_TRANSLATE_CRLF) { + Tcl_DStringAppendElement(dsPtr, "crlf"); + } else { + Tcl_DStringAppendElement(dsPtr, "lf"); + } + } + if (!(flags & (TCL_READABLE|TCL_WRITABLE))) { + /* + * Not readable or writable (e.g. server socket) + */ + + Tcl_DStringAppendElement(dsPtr, "auto"); + } + if (((flags & (TCL_READABLE|TCL_WRITABLE)) == + (TCL_READABLE|TCL_WRITABLE)) && (len == 0)) { + Tcl_DStringEndSublist(dsPtr); + } + if (len > 0) { + return TCL_OK; + } } - if (chanPtr->typePtr->getOptionProc != (Tcl_DriverGetOptionProc *) NULL) { + + if (chanPtr->typePtr->getOptionProc != NULL) { /* - * let the driver specific handle additional options - * and result code and message. + * Let the driver specific handle additional options and result code + * and message. */ - return (chanPtr->typePtr->getOptionProc) (chanPtr->instanceData, - interp, optionName, dsPtr); + return chanPtr->typePtr->getOptionProc(chanPtr->instanceData, interp, + optionName, dsPtr); } else { /* - * no driver specific options case. + * No driver specific options case. */ - if (len == 0) { - return TCL_OK; - } + if (len == 0) { + return TCL_OK; + } return Tcl_BadChannelOption(interp, optionName, NULL); } } @@ -5755,8 +7668,8 @@ Tcl_GetChannelOption(interp, chan, optionName, dsPtr) * Sets an option on a channel. * * Results: - * A standard Tcl result. On error, sets interp's result object - * if interp is not NULL. + * A standard Tcl result. On error, sets interp's result object if + * interp is not NULL. * * Side effects: * May modify an option on a device. @@ -5765,87 +7678,91 @@ Tcl_GetChannelOption(interp, chan, optionName, dsPtr) */ int -Tcl_SetChannelOption(interp, chan, optionName, newValue) - Tcl_Interp *interp; /* For error reporting - can be NULL. */ - Tcl_Channel chan; /* Channel on which to set mode. */ - char *optionName; /* Which option to set? */ - char *newValue; /* New value for option. */ +Tcl_SetChannelOption( + Tcl_Interp *interp, /* For error reporting - can be NULL. */ + Tcl_Channel chan, /* Channel on which to set mode. */ + const char *optionName, /* Which option to set? */ + const char *newValue) /* New value for option. */ { - int newMode; /* New (numeric) mode to sert. */ - Channel *chanPtr; /* The real IO channel. */ + Channel *chanPtr = (Channel *) chan; + /* The real IO channel. */ + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ size_t len; /* Length of optionName string. */ int argc; - char **argv; - - chanPtr = (Channel *) chan; + const char **argv; /* * If the channel is in the middle of a background copy, fail. */ - if (chanPtr->csPtr) { + if (statePtr->csPtrR || statePtr->csPtrW) { if (interp) { - Tcl_AppendResult(interp, - "unable to set channel options: background copy in progress", - (char *) NULL); + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "unable to set channel options: background copy in" + " progress", -1)); } - return TCL_ERROR; + return TCL_ERROR; } - /* * Disallow options on dead channels -- channels that have been closed but * not yet been deallocated. Such channels can be found if the exit - * handler for channel cleanup has run but the channel is still - * registered in an interpreter. + * handler for channel cleanup has run but the channel is still registered + * in an interpreter. + */ + + if (CheckForDeadChannel(NULL, statePtr)) { + return TCL_ERROR; + } + + /* + * This operation should occur at the top of a channel stack. */ - if (CheckForDeadChannel(NULL,chanPtr)) return TCL_ERROR; - + chanPtr = statePtr->topChanPtr; + len = strlen(optionName); - if ((len > 2) && (optionName[1] == 'b') && - (strncmp(optionName, "-blocking", len) == 0)) { - if (Tcl_GetBoolean(interp, newValue, &newMode) == TCL_ERROR) { - return TCL_ERROR; - } - if (newMode) { - newMode = TCL_MODE_BLOCKING; - } else { - newMode = TCL_MODE_NONBLOCKING; - } + if (HaveOpt(2, "-blocking")) { + int newMode; + + if (Tcl_GetBoolean(interp, newValue, &newMode) == TCL_ERROR) { + return TCL_ERROR; + } + if (newMode) { + newMode = TCL_MODE_BLOCKING; + } else { + newMode = TCL_MODE_NONBLOCKING; + } return SetBlockMode(interp, chanPtr, newMode); - } else if ((len > 7) && (optionName[1] == 'b') && - (strncmp(optionName, "-buffering", len) == 0)) { - len = strlen(newValue); - if ((newValue[0] == 'f') && (strncmp(newValue, "full", len) == 0)) { - chanPtr->flags &= - (~(CHANNEL_UNBUFFERED|CHANNEL_LINEBUFFERED)); - } else if ((newValue[0] == 'l') && - (strncmp(newValue, "line", len) == 0)) { - chanPtr->flags &= (~(CHANNEL_UNBUFFERED)); - chanPtr->flags |= CHANNEL_LINEBUFFERED; - } else if ((newValue[0] == 'n') && - (strncmp(newValue, "none", len) == 0)) { - chanPtr->flags &= (~(CHANNEL_LINEBUFFERED)); - chanPtr->flags |= CHANNEL_UNBUFFERED; - } else { - if (interp) { - Tcl_AppendResult(interp, "bad value for -buffering: ", - "must be one of full, line, or none", - (char *) NULL); - return TCL_ERROR; - } - } + } else if (HaveOpt(7, "-buffering")) { + len = strlen(newValue); + if ((newValue[0] == 'f') && (strncmp(newValue, "full", len) == 0)) { + ResetFlag(statePtr, CHANNEL_UNBUFFERED | CHANNEL_LINEBUFFERED); + } else if ((newValue[0] == 'l') && + (strncmp(newValue, "line", len) == 0)) { + ResetFlag(statePtr, CHANNEL_UNBUFFERED); + SetFlag(statePtr, CHANNEL_LINEBUFFERED); + } else if ((newValue[0] == 'n') && + (strncmp(newValue, "none", len) == 0)) { + ResetFlag(statePtr, CHANNEL_LINEBUFFERED); + SetFlag(statePtr, CHANNEL_UNBUFFERED); + } else if (interp) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "bad value for -buffering: must be one of" + " full, line, or none", -1)); + return TCL_ERROR; + } return TCL_OK; - } else if ((len > 7) && (optionName[1] == 'b') && - (strncmp(optionName, "-buffersize", len) == 0)) { - chanPtr->bufSize = atoi(newValue); /* INTL: "C", UTF safe. */ - if ((chanPtr->bufSize < 10) || (chanPtr->bufSize > (1024 * 1024))) { - chanPtr->bufSize = CHANNELBUFFER_DEFAULT_SIZE; - } - } else if ((len > 2) && (optionName[1] == 'e') && - (strncmp(optionName, "-encoding", len) == 0)) { + } else if (HaveOpt(7, "-buffersize")) { + int newBufferSize; + + if (Tcl_GetInt(interp, newValue, &newBufferSize) == TCL_ERROR) { + return TCL_ERROR; + } + Tcl_SetChannelBufferSize(chan, newBufferSize); + } else if (HaveOpt(2, "-encoding")) { Tcl_Encoding encoding; if ((newValue[0] == '\0') || (strcmp(newValue, "binary") == 0)) { @@ -5856,112 +7773,136 @@ Tcl_SetChannelOption(interp, chan, optionName, newValue) return TCL_ERROR; } } - Tcl_FreeEncoding(chanPtr->encoding); - chanPtr->encoding = encoding; - chanPtr->inputEncodingState = NULL; - chanPtr->inputEncodingFlags = TCL_ENCODING_START; - chanPtr->outputEncodingState = NULL; - chanPtr->outputEncodingFlags = TCL_ENCODING_START; - chanPtr->flags &= ~CHANNEL_NEED_MORE_DATA; + + /* + * When the channel has an escape sequence driven encoding such as + * iso2022, the terminated escape sequence must write to the buffer. + */ + + if ((statePtr->encoding != NULL) + && !(statePtr->outputEncodingFlags & TCL_ENCODING_START) + && (CheckChannelErrors(statePtr, TCL_WRITABLE) == 0)) { + statePtr->outputEncodingFlags |= TCL_ENCODING_END; + WriteChars(chanPtr, "", 0); + } + Tcl_FreeEncoding(statePtr->encoding); + statePtr->encoding = encoding; + statePtr->inputEncodingState = NULL; + statePtr->inputEncodingFlags = TCL_ENCODING_START; + statePtr->outputEncodingState = NULL; + statePtr->outputEncodingFlags = TCL_ENCODING_START; + ResetFlag(statePtr, CHANNEL_NEED_MORE_DATA); UpdateInterest(chanPtr); - } else if ((len > 2) && (optionName[1] == 'e') && - (strncmp(optionName, "-eofchar", len) == 0)) { - if (Tcl_SplitList(interp, newValue, &argc, &argv) == TCL_ERROR) { - return TCL_ERROR; - } - if (argc == 0) { - chanPtr->inEofChar = 0; - chanPtr->outEofChar = 0; - } else if (argc == 1) { - if (chanPtr->flags & TCL_WRITABLE) { - chanPtr->outEofChar = (int) argv[0][0]; - } - if (chanPtr->flags & TCL_READABLE) { - chanPtr->inEofChar = (int) argv[0][0]; - } - } else if (argc != 2) { - if (interp) { - Tcl_AppendResult(interp, - "bad value for -eofchar: should be a list of one or", - " two elements", (char *) NULL); - } - ckfree((char *) argv); - return TCL_ERROR; - } else { - if (chanPtr->flags & TCL_READABLE) { - chanPtr->inEofChar = (int) argv[0][0]; - } - if (chanPtr->flags & TCL_WRITABLE) { - chanPtr->outEofChar = (int) argv[1][0]; - } - } - if (argv != (char **) NULL) { - ckfree((char *) argv); - } + } else if (HaveOpt(2, "-eofchar")) { + if (Tcl_SplitList(interp, newValue, &argc, &argv) == TCL_ERROR) { + return TCL_ERROR; + } + if (argc == 0) { + statePtr->inEofChar = 0; + statePtr->outEofChar = 0; + } else if (argc == 1 || argc == 2) { + int outIndex = (argc - 1); + int inValue = (int) argv[0][0]; + int outValue = (int) argv[outIndex][0]; + + if (inValue & 0x80 || outValue & 0x80) { + if (interp) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "bad value for -eofchar: must be non-NUL ASCII" + " character", -1)); + } + ckfree(argv); + return TCL_ERROR; + } + if (GotFlag(statePtr, TCL_READABLE)) { + statePtr->inEofChar = inValue; + } + if (GotFlag(statePtr, TCL_WRITABLE)) { + statePtr->outEofChar = outValue; + } + } else { + if (interp) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "bad value for -eofchar: should be a list of zero," + " one, or two elements", -1)); + } + ckfree(argv); + return TCL_ERROR; + } + if (argv != NULL) { + ckfree(argv); + } + + /* + * [Bug 930851] Reset EOF and BLOCKED flags. Changing the character + * which signals eof can transform a current eof condition into a 'go + * ahead'. Ditto for blocked. + */ + + ResetFlag(statePtr, CHANNEL_EOF|CHANNEL_STICKY_EOF|CHANNEL_BLOCKED); return TCL_OK; - } else if ((len > 1) && (optionName[1] == 't') && - (strncmp(optionName, "-translation", len) == 0)) { - char *readMode, *writeMode; + } else if (HaveOpt(1, "-translation")) { + const char *readMode, *writeMode; - if (Tcl_SplitList(interp, newValue, &argc, &argv) == TCL_ERROR) { - return TCL_ERROR; - } + if (Tcl_SplitList(interp, newValue, &argc, &argv) == TCL_ERROR) { + return TCL_ERROR; + } - if (argc == 1) { - readMode = (chanPtr->flags & TCL_READABLE) ? argv[0] : NULL; - writeMode = (chanPtr->flags & TCL_WRITABLE) ? argv[0] : NULL; + if (argc == 1) { + readMode = GotFlag(statePtr, TCL_READABLE) ? argv[0] : NULL; + writeMode = GotFlag(statePtr, TCL_WRITABLE) ? argv[0] : NULL; } else if (argc == 2) { - readMode = (chanPtr->flags & TCL_READABLE) ? argv[0] : NULL; - writeMode = (chanPtr->flags & TCL_WRITABLE) ? argv[1] : NULL; + readMode = GotFlag(statePtr, TCL_READABLE) ? argv[0] : NULL; + writeMode = GotFlag(statePtr, TCL_WRITABLE) ? argv[1] : NULL; } else { - if (interp) { - Tcl_AppendResult(interp, - "bad value for -translation: must be a one or two", - " element list", (char *) NULL); - } - ckfree((char *) argv); - return TCL_ERROR; + if (interp) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "bad value for -translation: must be a one or two" + " element list", -1)); + } + ckfree(argv); + return TCL_ERROR; } if (readMode) { + TclEolTranslation translation; + if (*readMode == '\0') { - newMode = chanPtr->inputTranslation; + translation = statePtr->inputTranslation; } else if (strcmp(readMode, "auto") == 0) { - newMode = TCL_TRANSLATE_AUTO; + translation = TCL_TRANSLATE_AUTO; } else if (strcmp(readMode, "binary") == 0) { - newMode = TCL_TRANSLATE_LF; - chanPtr->inEofChar = 0; - Tcl_FreeEncoding(chanPtr->encoding); - chanPtr->encoding = NULL; + translation = TCL_TRANSLATE_LF; + statePtr->inEofChar = 0; + Tcl_FreeEncoding(statePtr->encoding); + statePtr->encoding = NULL; } else if (strcmp(readMode, "lf") == 0) { - newMode = TCL_TRANSLATE_LF; + translation = TCL_TRANSLATE_LF; } else if (strcmp(readMode, "cr") == 0) { - newMode = TCL_TRANSLATE_CR; + translation = TCL_TRANSLATE_CR; } else if (strcmp(readMode, "crlf") == 0) { - newMode = TCL_TRANSLATE_CRLF; + translation = TCL_TRANSLATE_CRLF; } else if (strcmp(readMode, "platform") == 0) { - newMode = TCL_PLATFORM_TRANSLATION; + translation = TCL_PLATFORM_TRANSLATION; } else { if (interp) { - Tcl_AppendResult(interp, - "bad value for -translation: ", - "must be one of auto, binary, cr, lf, crlf,", - " or platform", (char *) NULL); + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "bad value for -translation: must be one of " + "auto, binary, cr, lf, crlf, or platform", -1)); } - ckfree((char *) argv); + ckfree(argv); return TCL_ERROR; } /* - * Reset the EOL flags since we need to look at any buffered - * data to see if the new translation mode allows us to - * complete the line. + * Reset the EOL flags since we need to look at any buffered data + * to see if the new translation mode allows us to complete the + * line. */ - if (newMode != chanPtr->inputTranslation) { - chanPtr->inputTranslation = (Tcl_EolTranslation) newMode; - chanPtr->flags &= ~(INPUT_SAW_CR); - chanPtr->flags &= ~(CHANNEL_NEED_MORE_DATA); + if (translation != statePtr->inputTranslation) { + statePtr->inputTranslation = translation; + ResetFlag(statePtr, INPUT_SAW_CR | CHANNEL_NEED_MORE_DATA); UpdateInterest(chanPtr); } } @@ -5970,80 +7911,64 @@ Tcl_SetChannelOption(interp, chan, optionName, newValue) /* Do nothing. */ } else if (strcmp(writeMode, "auto") == 0) { /* - * This is a hack to get TCP sockets to produce output - * in CRLF mode if they are being set into AUTO mode. - * A better solution for achieving this effect will be - * coded later. + * This is a hack to get TCP sockets to produce output in CRLF + * mode if they are being set into AUTO mode. A better + * solution for achieving this effect will be coded later. */ - if (strcmp(chanPtr->typePtr->typeName, "tcp") == 0) { - chanPtr->outputTranslation = TCL_TRANSLATE_CRLF; + if (strcmp(Tcl_ChannelName(chanPtr->typePtr), "tcp") == 0) { + statePtr->outputTranslation = TCL_TRANSLATE_CRLF; } else { - chanPtr->outputTranslation = TCL_PLATFORM_TRANSLATION; + statePtr->outputTranslation = TCL_PLATFORM_TRANSLATION; } } else if (strcmp(writeMode, "binary") == 0) { - chanPtr->outEofChar = 0; - chanPtr->outputTranslation = TCL_TRANSLATE_LF; - Tcl_FreeEncoding(chanPtr->encoding); - chanPtr->encoding = NULL; + statePtr->outEofChar = 0; + statePtr->outputTranslation = TCL_TRANSLATE_LF; + Tcl_FreeEncoding(statePtr->encoding); + statePtr->encoding = NULL; } else if (strcmp(writeMode, "lf") == 0) { - chanPtr->outputTranslation = TCL_TRANSLATE_LF; + statePtr->outputTranslation = TCL_TRANSLATE_LF; } else if (strcmp(writeMode, "cr") == 0) { - chanPtr->outputTranslation = TCL_TRANSLATE_CR; + statePtr->outputTranslation = TCL_TRANSLATE_CR; } else if (strcmp(writeMode, "crlf") == 0) { - chanPtr->outputTranslation = TCL_TRANSLATE_CRLF; + statePtr->outputTranslation = TCL_TRANSLATE_CRLF; } else if (strcmp(writeMode, "platform") == 0) { - chanPtr->outputTranslation = TCL_PLATFORM_TRANSLATION; + statePtr->outputTranslation = TCL_PLATFORM_TRANSLATION; } else { if (interp) { - Tcl_AppendResult(interp, - "bad value for -translation: ", - "must be one of auto, binary, cr, lf, crlf,", - " or platform", (char *) NULL); + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "bad value for -translation: must be one of " + "auto, binary, cr, lf, crlf, or platform", -1)); } - ckfree((char *) argv); + ckfree(argv); return TCL_ERROR; } } - ckfree((char *) argv); - return TCL_OK; + ckfree(argv); + return TCL_OK; } else if (chanPtr->typePtr->setOptionProc != NULL) { - return (*chanPtr->typePtr->setOptionProc)(chanPtr->instanceData, - interp, optionName, newValue); + return chanPtr->typePtr->setOptionProc(chanPtr->instanceData, interp, + optionName, newValue); } else { - return Tcl_BadChannelOption(interp, optionName, (char *) NULL); + return Tcl_BadChannelOption(interp, optionName, NULL); } /* * If bufsize changes, need to get rid of old utility buffer. */ - if (chanPtr->saveInBufPtr != NULL) { - RecycleBuffer(chanPtr, chanPtr->saveInBufPtr, 1); - chanPtr->saveInBufPtr = NULL; + if (statePtr->saveInBufPtr != NULL) { + RecycleBuffer(statePtr, statePtr->saveInBufPtr, 1); + statePtr->saveInBufPtr = NULL; } - if (chanPtr->inQueueHead != NULL) { - if ((chanPtr->inQueueHead->nextPtr == NULL) - && (chanPtr->inQueueHead->nextAdded == - chanPtr->inQueueHead->nextRemoved)) { - RecycleBuffer(chanPtr, chanPtr->inQueueHead, 1); - chanPtr->inQueueHead = NULL; - chanPtr->inQueueTail = NULL; - } + if ((statePtr->inQueueHead != NULL) + && (statePtr->inQueueHead->nextPtr == NULL) + && IsBufferEmpty(statePtr->inQueueHead)) { + RecycleBuffer(statePtr, statePtr->inQueueHead, 1); + statePtr->inQueueHead = NULL; + statePtr->inQueueTail = NULL; } - /* - * If encoding or bufsize changes, need to update output staging buffer. - */ - - if (chanPtr->outputStage != NULL) { - ckfree((char *) chanPtr->outputStage); - chanPtr->outputStage = NULL; - } - if ((chanPtr->encoding != NULL) && (chanPtr->flags & TCL_WRITABLE)) { - chanPtr->outputStage = (char *) - ckalloc((unsigned) (chanPtr->bufSize + 2)); - } return TCL_OK; } @@ -6052,11 +7977,10 @@ Tcl_SetChannelOption(interp, chan, optionName, newValue) * * CleanupChannelHandlers -- * - * Removes channel handlers that refer to the supplied interpreter, - * so that if the actual channel is not closed now, these handlers - * will not run on subsequent events on the channel. This would be - * erroneous, because the interpreter no longer has a reference to - * this channel. + * Removes channel handlers that refer to the supplied interpreter, so + * that if the actual channel is not closed now, these handlers will not + * run on subsequent events on the channel. This would be erroneous, + * because the interpreter no longer has a reference to this channel. * * Results: * None. @@ -6068,37 +7992,37 @@ Tcl_SetChannelOption(interp, chan, optionName, newValue) */ static void -CleanupChannelHandlers(interp, chanPtr) - Tcl_Interp *interp; - Channel *chanPtr; +CleanupChannelHandlers( + Tcl_Interp *interp, + Channel *chanPtr) { + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ EventScriptRecord *sPtr, *prevPtr, *nextPtr; /* - * Remove fileevent records on this channel that refer to the - * given interpreter. - */ - - for (sPtr = chanPtr->scriptRecordPtr, - prevPtr = (EventScriptRecord *) NULL; - sPtr != (EventScriptRecord *) NULL; - sPtr = nextPtr) { - nextPtr = sPtr->nextPtr; - if (sPtr->interp == interp) { - if (prevPtr == (EventScriptRecord *) NULL) { - chanPtr->scriptRecordPtr = nextPtr; - } else { - prevPtr->nextPtr = nextPtr; - } + * Remove fileevent records on this channel that refer to the given + * interpreter. + */ - Tcl_DeleteChannelHandler((Tcl_Channel) chanPtr, - ChannelEventScriptInvoker, (ClientData) sPtr); + for (sPtr = statePtr->scriptRecordPtr, prevPtr = NULL; + sPtr != NULL; sPtr = nextPtr) { + nextPtr = sPtr->nextPtr; + if (sPtr->interp == interp) { + if (prevPtr == NULL) { + statePtr->scriptRecordPtr = nextPtr; + } else { + prevPtr->nextPtr = nextPtr; + } - Tcl_DecrRefCount(sPtr->scriptPtr); - ckfree((char *) sPtr); - } else { - prevPtr = sPtr; - } + Tcl_DeleteChannelHandler((Tcl_Channel) chanPtr, + TclChannelEventScriptInvoker, sPtr); + + TclDecrRefCount(sPtr->scriptPtr); + ckfree(sPtr); + } else { + prevPtr = sPtr; + } } } @@ -6107,10 +8031,9 @@ CleanupChannelHandlers(interp, chanPtr) * * Tcl_NotifyChannel -- * - * This procedure is called by a channel driver when a driver - * detects an event on a channel. This procedure is responsible - * for actually handling the event by invoking any channel - * handler callbacks. + * This procedure is called by a channel driver when a driver detects an + * event on a channel. This procedure is responsible for actually + * handling the event by invoking any channel handler callbacks. * * Results: * None. @@ -6122,88 +8045,137 @@ CleanupChannelHandlers(interp, chanPtr) */ void -Tcl_NotifyChannel(channel, mask) - Tcl_Channel channel; /* Channel that detected an event. */ - int mask; /* OR'ed combination of TCL_READABLE, +Tcl_NotifyChannel( + Tcl_Channel channel, /* Channel that detected an event. */ + int mask) /* OR'ed combination of TCL_READABLE, * TCL_WRITABLE, or TCL_EXCEPTION: indicates * which events were detected. */ { Channel *chanPtr = (Channel *) channel; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ ChannelHandler *chPtr; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); NextChannelHandler nh; + Channel *upChanPtr; + const Tcl_ChannelType *upTypePtr; - /* Walk all channels in a stack ! and notify them in order. +#ifdef TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING + /* + * [SF Tcl Bug 943274] For a non-blocking channel without blockmodeproc we + * keep track of actual input coming from the OS so that we can do a + * credible imitation of non-blocking behaviour. */ - while (chanPtr != (Channel *) NULL) { - /* - * Preserve the channel struct in case the script closes it. - */ - - Tcl_Preserve((ClientData) channel); + if ((mask & TCL_READABLE) && + GotFlag(statePtr, CHANNEL_NONBLOCKING) && + (Tcl_ChannelBlockModeProc(chanPtr->typePtr) == NULL) && + !GotFlag(statePtr, CHANNEL_TIMER_FEV)) { + SetFlag(statePtr, CHANNEL_HAS_MORE_DATA); + } +#endif /* TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING */ - /* - * If we are flushing in the background, be sure to call FlushChannel - * for writable events. Note that we have to discard the writable - * event so we don't call any write handlers before the flush is - * complete. - */ + /* + * In contrast to the other API functions this procedure walks towards the + * top of a stack and not down from it. + * + * The channel calling this procedure is the one who generated the event, + * and thus does not take part in handling it. IOW, its HandlerProc is not + * called, instead we begin with the channel above it. + * + * This behaviour also allows the transformation channels to generate + * their own events and pass them upward. + */ - if ((chanPtr->flags & BG_FLUSH_SCHEDULED) && (mask & TCL_WRITABLE)) { - FlushChannel(NULL, chanPtr, 1); - mask &= ~TCL_WRITABLE; + while (mask && (chanPtr->upChanPtr != NULL)) { + Tcl_DriverHandlerProc *upHandlerProc; + + upChanPtr = chanPtr->upChanPtr; + upTypePtr = upChanPtr->typePtr; + upHandlerProc = Tcl_ChannelHandlerProc(upTypePtr); + if (upHandlerProc != NULL) { + mask = upHandlerProc(upChanPtr->instanceData, mask); } /* - * Add this invocation to the list of recursive invocations of - * ChannelHandlerEventProc. + * ELSE: Ignore transformations which are unable to handle the event + * coming from below. Assume that they don't change the mask and pass + * it on. */ - - nh.nextHandlerPtr = (ChannelHandler *) NULL; - nh.nestedHandlerPtr = tsdPtr->nestedHandlerPtr; - tsdPtr->nestedHandlerPtr = &nh; - - for (chPtr = chanPtr->chPtr; chPtr != (ChannelHandler *) NULL; ) { - /* - * If this channel handler is interested in any of the events that - * have occurred on the channel, invoke its procedure. - */ - - if ((chPtr->mask & mask) != 0) { - nh.nextHandlerPtr = chPtr->nextPtr; - (*(chPtr->proc))(chPtr->clientData, mask); - chPtr = nh.nextHandlerPtr; - } else { - chPtr = chPtr->nextPtr; - } - } + chanPtr = upChanPtr; + } + + channel = (Tcl_Channel) chanPtr; + /* + * Here we have either reached the top of the stack or the mask is empty. + * We break out of the procedure if it is the latter. + */ + + if (!mask) { + return; + } + + /* + * We are now above the topmost channel in a stack and have events left. + * Now call the channel handlers as usual. + * + * Preserve the channel struct in case the script closes it. + */ + + Tcl_Preserve(channel); + Tcl_Preserve(statePtr); + + /* + * If we are flushing in the background, be sure to call FlushChannel for + * writable events. Note that we have to discard the writable event so we + * don't call any write handlers before the flush is complete. + */ + + if (GotFlag(statePtr, BG_FLUSH_SCHEDULED) && (mask & TCL_WRITABLE)) { + FlushChannel(NULL, chanPtr, 1); + mask &= ~TCL_WRITABLE; + } + + /* + * Add this invocation to the list of recursive invocations of + * ChannelHandlerEventProc. + */ + + nh.nextHandlerPtr = NULL; + nh.nestedHandlerPtr = tsdPtr->nestedHandlerPtr; + tsdPtr->nestedHandlerPtr = &nh; + + for (chPtr = statePtr->chPtr; chPtr != NULL; ) { /* - * Update the notifier interest, since it may have changed after - * invoking event handlers. Skip that if the channel was deleted - * in the call to the channel handler. + * If this channel handler is interested in any of the events that + * have occurred on the channel, invoke its procedure. */ - if (chanPtr->typePtr != NULL) { - UpdateInterest(chanPtr); - - /* Walk down the stack. - */ - chanPtr = chanPtr-> supercedes; + if ((chPtr->mask & mask) != 0) { + nh.nextHandlerPtr = chPtr->nextPtr; + chPtr->proc(chPtr->clientData, mask); + chPtr = nh.nextHandlerPtr; } else { - /* Stop walking the chain, the whole stack was destroyed! - */ - chanPtr = (Channel*) NULL; + chPtr = chPtr->nextPtr; } + } - Tcl_Release((ClientData) channel); - - tsdPtr->nestedHandlerPtr = nh.nestedHandlerPtr; + /* + * Update the notifier interest, since it may have changed after invoking + * event handlers. Skip that if the channel was deleted in the call to the + * channel handler. + */ - channel = (Tcl_Channel) chanPtr; + if (chanPtr->typePtr != NULL) { + UpdateInterest(chanPtr); } + + Tcl_Release(statePtr); + Tcl_Release(channel); + + tsdPtr->nestedHandlerPtr = nh.nestedHandlerPtr; } /* @@ -6211,8 +8183,8 @@ Tcl_NotifyChannel(channel, mask) * * UpdateInterest -- * - * Arrange for the notifier to call us back at appropriate times - * based on the current state of the channel. + * Arrange for the notifier to call us back at appropriate times based on + * the current state of the channel. * * Results: * None. @@ -6224,40 +8196,87 @@ Tcl_NotifyChannel(channel, mask) */ static void -UpdateInterest(chanPtr) - Channel *chanPtr; /* Channel to update. */ +UpdateInterest( + Channel *chanPtr) /* Channel to update. */ { - int mask = chanPtr->interestMask; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ + int mask = statePtr->interestMask; + + if (chanPtr->typePtr == NULL) { + /* Do not update interest on a closed channel */ + return; + } /* - * If there are flushed buffers waiting to be written, then - * we need to watch for the channel to become writable. + * If there are flushed buffers waiting to be written, then we need to + * watch for the channel to become writable. */ - if (chanPtr->flags & BG_FLUSH_SCHEDULED) { + if (GotFlag(statePtr, BG_FLUSH_SCHEDULED)) { mask |= TCL_WRITABLE; } /* * If there is data in the input queue, and we aren't waiting for more * data, then we need to schedule a timer so we don't block in the - * notifier. Also, cancel the read interest so we don't get duplicate + * notifier. Also, cancel the read interest so we don't get duplicate * events. */ if (mask & TCL_READABLE) { - if (!(chanPtr->flags & CHANNEL_NEED_MORE_DATA) - && (chanPtr->inQueueHead != (ChannelBuffer *) NULL) - && (chanPtr->inQueueHead->nextRemoved < - chanPtr->inQueueHead->nextAdded)) { + if (!GotFlag(statePtr, CHANNEL_NEED_MORE_DATA) + && (statePtr->inQueueHead != NULL) + && IsBufferReady(statePtr->inQueueHead)) { mask &= ~TCL_READABLE; - if (!chanPtr->timer) { - chanPtr->timer = Tcl_CreateTimerHandler(0, ChannelTimerProc, - (ClientData) chanPtr); + + /* + * Andreas Kupries, April 11, 2003 + * + * Some operating systems (Solaris 2.6 and higher (but not Solaris + * 2.5, go figure)) generate READABLE and EXCEPTION events when + * select()'ing [*] on a plain file, even if EOF was not yet + * reached. This is a problem in the following situation: + * + * - An extension asks to get both READABLE and EXCEPTION events. + * - It reads data into a buffer smaller than the buffer used by + * Tcl itself. + * - It does not process all events in the event queue, but only + * one, at least in some situations. + * + * In that case we can get into a situation where + * + * - Tcl drops READABLE here, because it has data in its own + * buffers waiting to be read by the extension. + * - A READABLE event is syntesized via timer. + * - The OS still reports the EXCEPTION condition on the file. + * - And the extension gets the EXCPTION event first, and handles + * this as EOF. + * + * End result ==> Premature end of reading from a file. + * + * The concrete example is 'Expect', and its [expect] command + * (and at the C-level, deep in the bowels of Expect, + * 'exp_get_next_event'. See marker 'SunOS' for commentary in + * that function too). + * + * [*] As the Tcl notifier does. See also for marker 'SunOS' in + * file 'exp_event.c' of Expect. + * + * Our solution here is to drop the interest in the EXCEPTION + * events too. This compiles on all platforms, and also passes the + * testsuite on all of them. + */ + + mask &= ~TCL_EXCEPTION; + + if (!statePtr->timer) { + statePtr->timer = Tcl_CreateTimerHandler(SYNTHETIC_EVENT_TIME, + ChannelTimerProc, chanPtr); } } } - (chanPtr->typePtr->watchProc)(chanPtr->instanceData, mask); + ChanWatch(chanPtr, mask); } /* @@ -6265,8 +8284,8 @@ UpdateInterest(chanPtr) * * ChannelTimerProc -- * - * Timer handler scheduled by UpdateInterest to monitor the - * channel buffers until they are empty. + * Timer handler scheduled by UpdateInterest to monitor the channel + * buffers until they are empty. * * Results: * None. @@ -6278,27 +8297,50 @@ UpdateInterest(chanPtr) */ static void -ChannelTimerProc(clientData) - ClientData clientData; +ChannelTimerProc( + ClientData clientData) { - Channel *chanPtr = (Channel *) clientData; + Channel *chanPtr = clientData; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ + + if (!GotFlag(statePtr, CHANNEL_NEED_MORE_DATA) + && (statePtr->interestMask & TCL_READABLE) + && (statePtr->inQueueHead != NULL) + && IsBufferReady(statePtr->inQueueHead)) { + /* + * Restart the timer in case a channel handler reenters the event loop + * before UpdateInterest gets called by Tcl_NotifyChannel. + */ + + statePtr->timer = Tcl_CreateTimerHandler(SYNTHETIC_EVENT_TIME, + ChannelTimerProc,chanPtr); - if (!(chanPtr->flags & CHANNEL_NEED_MORE_DATA) - && (chanPtr->interestMask & TCL_READABLE) - && (chanPtr->inQueueHead != (ChannelBuffer *) NULL) - && (chanPtr->inQueueHead->nextRemoved < - chanPtr->inQueueHead->nextAdded)) { +#ifdef TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING /* - * Restart the timer in case a channel handler reenters the - * event loop before UpdateInterest gets called by Tcl_NotifyChannel. + * Set the TIMER flag to notify the higher levels that the driver + * might have no data for us. We do this only if we are in + * non-blocking mode and the driver has no BlockModeProc because only + * then we really don't know if the driver will block or not. A + * similar test is done in "PeekAhead". */ - chanPtr->timer = Tcl_CreateTimerHandler(0, ChannelTimerProc, - (ClientData) chanPtr); - Tcl_NotifyChannel((Tcl_Channel)chanPtr, TCL_READABLE); - - } else { - chanPtr->timer = NULL; + if (GotFlag(statePtr, CHANNEL_NONBLOCKING) && + (Tcl_ChannelBlockModeProc(chanPtr->typePtr) == NULL)) { + SetFlag(statePtr, CHANNEL_TIMER_FEV); + } +#endif /* TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING */ + + Tcl_Preserve(statePtr); + Tcl_NotifyChannel((Tcl_Channel) chanPtr, TCL_READABLE); + +#ifdef TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING + ResetFlag(statePtr, CHANNEL_TIMER_FEV); +#endif /* TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING */ + + Tcl_Release(statePtr); + } else { + statePtr->timer = NULL; UpdateInterest(chanPtr); } } @@ -6308,85 +8350,79 @@ ChannelTimerProc(clientData) * * Tcl_CreateChannelHandler -- * - * Arrange for a given procedure to be invoked whenever the - * channel indicated by the chanPtr arg becomes readable or - * writable. + * Arrange for a given procedure to be invoked whenever the channel + * indicated by the chanPtr arg becomes readable or writable. * * Results: * None. * * Side effects: - * From now on, whenever the I/O channel given by chanPtr becomes - * ready in the way indicated by mask, proc will be invoked. - * See the manual entry for details on the calling sequence - * to proc. If there is already an event handler for chan, proc - * and clientData, then the mask will be updated. + * From now on, whenever the I/O channel given by chanPtr becomes ready + * in the way indicated by mask, proc will be invoked. See the manual + * entry for details on the calling sequence to proc. If there is already + * an event handler for chan, proc and clientData, then the mask will be + * updated. * *---------------------------------------------------------------------- */ void -Tcl_CreateChannelHandler(chan, mask, proc, clientData) - Tcl_Channel chan; /* The channel to create the handler for. */ - int mask; /* OR'ed combination of TCL_READABLE, - * TCL_WRITABLE, and TCL_EXCEPTION: - * indicates conditions under which - * proc should be called. Use 0 to - * disable a registered handler. */ - Tcl_ChannelProc *proc; /* Procedure to call for each - * selected event. */ - ClientData clientData; /* Arbitrary data to pass to proc. */ +Tcl_CreateChannelHandler( + Tcl_Channel chan, /* The channel to create the handler for. */ + int mask, /* OR'ed combination of TCL_READABLE, + * TCL_WRITABLE, and TCL_EXCEPTION: indicates + * conditions under which proc should be + * called. Use 0 to disable a registered + * handler. */ + Tcl_ChannelProc *proc, /* Procedure to call for each selected + * event. */ + ClientData clientData) /* Arbitrary data to pass to proc. */ { ChannelHandler *chPtr; - Channel *chanPtr; + Channel *chanPtr = (Channel *) chan; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ - chanPtr = (Channel *) chan; - /* - * Check whether this channel handler is not already registered. If - * it is not, create a new record, else reuse existing record (smash - * current values). + * Check whether this channel handler is not already registered. If it is + * not, create a new record, else reuse existing record (smash current + * values). */ - for (chPtr = chanPtr->chPtr; - chPtr != (ChannelHandler *) NULL; - chPtr = chPtr->nextPtr) { - if ((chPtr->chanPtr == chanPtr) && (chPtr->proc == proc) && - (chPtr->clientData == clientData)) { - break; - } + for (chPtr = statePtr->chPtr; chPtr != NULL; chPtr = chPtr->nextPtr) { + if ((chPtr->chanPtr == chanPtr) && (chPtr->proc == proc) && + (chPtr->clientData == clientData)) { + break; + } } - if (chPtr == (ChannelHandler *) NULL) { - chPtr = (ChannelHandler *) ckalloc((unsigned) sizeof(ChannelHandler)); - chPtr->mask = 0; - chPtr->proc = proc; - chPtr->clientData = clientData; - chPtr->chanPtr = chanPtr; - chPtr->nextPtr = chanPtr->chPtr; - chanPtr->chPtr = chPtr; + if (chPtr == NULL) { + chPtr = ckalloc(sizeof(ChannelHandler)); + chPtr->mask = 0; + chPtr->proc = proc; + chPtr->clientData = clientData; + chPtr->chanPtr = chanPtr; + chPtr->nextPtr = statePtr->chPtr; + statePtr->chPtr = chPtr; } /* - * The remainder of the initialization below is done regardless of - * whether or not this is a new record or a modification of an old - * one. + * The remainder of the initialization below is done regardless of whether + * or not this is a new record or a modification of an old one. */ chPtr->mask = mask; /* - * Recompute the interest mask for the channel - this call may actually - * be disabling an existing handler. + * Recompute the interest mask for the channel - this call may actually be + * disabling an existing handler. */ - - chanPtr->interestMask = 0; - for (chPtr = chanPtr->chPtr; - chPtr != (ChannelHandler *) NULL; - chPtr = chPtr->nextPtr) { - chanPtr->interestMask |= chPtr->mask; + + statePtr->interestMask = 0; + for (chPtr = statePtr->chPtr; chPtr != NULL; chPtr = chPtr->nextPtr) { + statePtr->interestMask |= chPtr->mask; } - UpdateInterest(chanPtr); + UpdateInterest(statePtr->topChanPtr); } /* @@ -6394,56 +8430,53 @@ Tcl_CreateChannelHandler(chan, mask, proc, clientData) * * Tcl_DeleteChannelHandler -- * - * Cancel a previously arranged callback arrangement for an IO - * channel. + * Cancel a previously arranged callback arrangement for an IO channel. * * Results: * None. * * Side effects: * If a callback was previously registered for this chan, proc and - * clientData , it is removed and the callback will no longer be called + * clientData, it is removed and the callback will no longer be called * when the channel becomes ready for IO. * *---------------------------------------------------------------------- */ void -Tcl_DeleteChannelHandler(chan, proc, clientData) - Tcl_Channel chan; /* The channel for which to remove the - * callback. */ - Tcl_ChannelProc *proc; /* The procedure in the callback to delete. */ - ClientData clientData; /* The client data in the callback - * to delete. */ - +Tcl_DeleteChannelHandler( + Tcl_Channel chan, /* The channel for which to remove the + * callback. */ + Tcl_ChannelProc *proc, /* The procedure in the callback to delete. */ + ClientData clientData) /* The client data in the callback to + * delete. */ { - ChannelHandler *chPtr, *prevChPtr; - Channel *chanPtr; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + ChannelHandler *chPtr, *prevChPtr; + Channel *chanPtr = (Channel *) chan; + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ NextChannelHandler *nhPtr; - chanPtr = (Channel *) chan; - /* * Find the entry and the previous one in the list. */ - for (prevChPtr = (ChannelHandler *) NULL, chPtr = chanPtr->chPtr; - chPtr != (ChannelHandler *) NULL; - chPtr = chPtr->nextPtr) { - if ((chPtr->chanPtr == chanPtr) && (chPtr->clientData == clientData) - && (chPtr->proc == proc)) { - break; - } - prevChPtr = chPtr; + for (prevChPtr = NULL, chPtr = statePtr->chPtr; chPtr != NULL; + chPtr = chPtr->nextPtr) { + if ((chPtr->chanPtr == chanPtr) && (chPtr->clientData == clientData) + && (chPtr->proc == proc)) { + break; + } + prevChPtr = chPtr; } - + /* * If not found, return without doing anything. */ - if (chPtr == (ChannelHandler *) NULL) { - return; + if (chPtr == NULL) { + return; } /* @@ -6451,39 +8484,35 @@ Tcl_DeleteChannelHandler(chan, proc, clientData) * process the next one instead - we are going to delete *this* one. */ - for (nhPtr = tsdPtr->nestedHandlerPtr; - nhPtr != (NextChannelHandler *) NULL; - nhPtr = nhPtr->nestedHandlerPtr) { - if (nhPtr->nextHandlerPtr == chPtr) { - nhPtr->nextHandlerPtr = chPtr->nextPtr; - } + for (nhPtr = tsdPtr->nestedHandlerPtr; nhPtr != NULL; + nhPtr = nhPtr->nestedHandlerPtr) { + if (nhPtr->nextHandlerPtr == chPtr) { + nhPtr->nextHandlerPtr = chPtr->nextPtr; + } } /* * Splice it out of the list of channel handlers. */ - - if (prevChPtr == (ChannelHandler *) NULL) { - chanPtr->chPtr = chPtr->nextPtr; + + if (prevChPtr == NULL) { + statePtr->chPtr = chPtr->nextPtr; } else { - prevChPtr->nextPtr = chPtr->nextPtr; + prevChPtr->nextPtr = chPtr->nextPtr; } - ckfree((char *) chPtr); + ckfree(chPtr); /* * Recompute the interest list for the channel, so that infinite loops - * will not result if Tcl_DeleteChannelHandler is called inside an - * event. + * will not result if Tcl_DeleteChannelHandler is called inside an event. */ - chanPtr->interestMask = 0; - for (chPtr = chanPtr->chPtr; - chPtr != (ChannelHandler *) NULL; - chPtr = chPtr->nextPtr) { - chanPtr->interestMask |= chPtr->mask; + statePtr->interestMask = 0; + for (chPtr = statePtr->chPtr; chPtr != NULL; chPtr = chPtr->nextPtr) { + statePtr->interestMask |= chPtr->mask; } - UpdateInterest(chanPtr); + UpdateInterest(statePtr->topChanPtr); } /* @@ -6491,8 +8520,8 @@ Tcl_DeleteChannelHandler(chan, proc, clientData) * * DeleteScriptRecord -- * - * Delete a script record for this combination of channel, interp - * and mask. + * Delete a script record for this combination of channel, interp and + * mask. * * Results: * None. @@ -6504,35 +8533,36 @@ Tcl_DeleteChannelHandler(chan, proc, clientData) */ static void -DeleteScriptRecord(interp, chanPtr, mask) - Tcl_Interp *interp; /* Interpreter in which script was to be - * executed. */ - Channel *chanPtr; /* The channel for which to delete the - * script record (if any). */ - int mask; /* Events in mask must exactly match mask - * of script to delete. */ +DeleteScriptRecord( + Tcl_Interp *interp, /* Interpreter in which script was to be + * executed. */ + Channel *chanPtr, /* The channel for which to delete the script + * record (if any). */ + int mask) /* Events in mask must exactly match mask of + * script to delete. */ { + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ EventScriptRecord *esPtr, *prevEsPtr; - for (esPtr = chanPtr->scriptRecordPtr, - prevEsPtr = (EventScriptRecord *) NULL; - esPtr != (EventScriptRecord *) NULL; - prevEsPtr = esPtr, esPtr = esPtr->nextPtr) { - if ((esPtr->interp == interp) && (esPtr->mask == mask)) { - if (esPtr == chanPtr->scriptRecordPtr) { - chanPtr->scriptRecordPtr = esPtr->nextPtr; - } else { - prevEsPtr->nextPtr = esPtr->nextPtr; - } + for (esPtr = statePtr->scriptRecordPtr, prevEsPtr = NULL; esPtr != NULL; + prevEsPtr = esPtr, esPtr = esPtr->nextPtr) { + if ((esPtr->interp == interp) && (esPtr->mask == mask)) { + if (esPtr == statePtr->scriptRecordPtr) { + statePtr->scriptRecordPtr = esPtr->nextPtr; + } else { + CLANG_ASSERT(prevEsPtr); + prevEsPtr->nextPtr = esPtr->nextPtr; + } - Tcl_DeleteChannelHandler((Tcl_Channel) chanPtr, - ChannelEventScriptInvoker, (ClientData) esPtr); - - Tcl_DecrRefCount(esPtr->scriptPtr); - ckfree((char *) esPtr); + Tcl_DeleteChannelHandler((Tcl_Channel) chanPtr, + TclChannelEventScriptInvoker, esPtr); - break; - } + TclDecrRefCount(esPtr->scriptPtr); + ckfree(esPtr); + + break; + } } } @@ -6554,49 +8584,64 @@ DeleteScriptRecord(interp, chanPtr, mask) */ static void -CreateScriptRecord(interp, chanPtr, mask, scriptPtr) - Tcl_Interp *interp; /* Interpreter in which to execute - * the stored script. */ - Channel *chanPtr; /* Channel for which script is to - * be stored. */ - int mask; /* Set of events for which script - * will be invoked. */ - Tcl_Obj *scriptPtr; /* Pointer to script object. */ +CreateScriptRecord( + Tcl_Interp *interp, /* Interpreter in which to execute the stored + * script. */ + Channel *chanPtr, /* Channel for which script is to be stored */ + int mask, /* Set of events for which script will be + * invoked. */ + Tcl_Obj *scriptPtr) /* Pointer to script object. */ { + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ EventScriptRecord *esPtr; + int makeCH; - for (esPtr = chanPtr->scriptRecordPtr; - esPtr != (EventScriptRecord *) NULL; - esPtr = esPtr->nextPtr) { - if ((esPtr->interp == interp) && (esPtr->mask == mask)) { - Tcl_DecrRefCount(esPtr->scriptPtr); - esPtr->scriptPtr = (Tcl_Obj *) NULL; - break; - } + for (esPtr=statePtr->scriptRecordPtr; esPtr!=NULL; esPtr=esPtr->nextPtr) { + if ((esPtr->interp == interp) && (esPtr->mask == mask)) { + TclDecrRefCount(esPtr->scriptPtr); + esPtr->scriptPtr = NULL; + break; + } } - if (esPtr == (EventScriptRecord *) NULL) { - esPtr = (EventScriptRecord *) ckalloc((unsigned) - sizeof(EventScriptRecord)); - Tcl_CreateChannelHandler((Tcl_Channel) chanPtr, mask, - ChannelEventScriptInvoker, (ClientData) esPtr); - esPtr->nextPtr = chanPtr->scriptRecordPtr; - chanPtr->scriptRecordPtr = esPtr; + + makeCH = (esPtr == NULL); + + if (makeCH) { + esPtr = ckalloc(sizeof(EventScriptRecord)); } + + /* + * Initialize the structure before calling Tcl_CreateChannelHandler, + * because a reflected channel calling 'chan postevent' aka + * 'Tcl_NotifyChannel' in its 'watch'Proc will invoke + * 'TclChannelEventScriptInvoker' immediately, and we do not wish it to + * see uninitialized memory and crash. See [Bug 2918110]. + */ + esPtr->chanPtr = chanPtr; esPtr->interp = interp; esPtr->mask = mask; Tcl_IncrRefCount(scriptPtr); esPtr->scriptPtr = scriptPtr; + + if (makeCH) { + esPtr->nextPtr = statePtr->scriptRecordPtr; + statePtr->scriptRecordPtr = esPtr; + + Tcl_CreateChannelHandler((Tcl_Channel) chanPtr, mask, + TclChannelEventScriptInvoker, esPtr); + } } /* *---------------------------------------------------------------------- * - * ChannelEventScriptInvoker -- + * TclChannelEventScriptInvoker -- * - * Invokes a script scheduled by "fileevent" for when the channel - * becomes ready for IO. This function is invoked by the channel - * handler which was created by the Tcl "fileevent" command. + * Invokes a script scheduled by "fileevent" for when the channel becomes + * ready for IO. This function is invoked by the channel handler which + * was created by the Tcl "fileevent" command. * * Results: * None. @@ -6607,48 +8652,49 @@ CreateScriptRecord(interp, chanPtr, mask, scriptPtr) *---------------------------------------------------------------------- */ -static void -ChannelEventScriptInvoker(clientData, mask) - ClientData clientData; /* The script+interp record. */ - int mask; /* Not used. */ +void +TclChannelEventScriptInvoker( + ClientData clientData, /* The script+interp record. */ + int mask) /* Not used. */ { Tcl_Interp *interp; /* Interpreter in which to eval the script. */ Channel *chanPtr; /* The channel for which this handler is - * registered. */ + * registered. */ EventScriptRecord *esPtr; /* The event script + interpreter to eval it - * in. */ + * in. */ int result; /* Result of call to eval script. */ - esPtr = (EventScriptRecord *) clientData; - + esPtr = clientData; chanPtr = esPtr->chanPtr; mask = esPtr->mask; interp = esPtr->interp; - + /* - * We must preserve the interpreter so we can report errors on it - * later. Note that we do not need to preserve the channel because - * that is done by Tcl_NotifyChannel before calling channel handlers. + * We must preserve the interpreter so we can report errors on it later. + * Note that we do not need to preserve the channel because that is done + * by Tcl_NotifyChannel before calling channel handlers. */ - - Tcl_Preserve((ClientData) interp); + + Tcl_Preserve(interp); + Tcl_Preserve(chanPtr); result = Tcl_EvalObjEx(interp, esPtr->scriptPtr, TCL_EVAL_GLOBAL); /* - * On error, cause a background error and remove the channel handler - * and the script record. + * On error, cause a background error and remove the channel handler and + * the script record. * * NOTE: Must delete channel handler before causing the background error * because the background error may want to reinstall the handler. */ - + if (result != TCL_OK) { if (chanPtr->typePtr != NULL) { DeleteScriptRecord(interp, chanPtr, mask); } - Tcl_BackgroundError(interp); + Tcl_BackgroundException(interp, result); } - Tcl_Release((ClientData) interp); + Tcl_Release(chanPtr); + Tcl_Release(interp); } /* @@ -6656,10 +8702,10 @@ ChannelEventScriptInvoker(clientData, mask) * * Tcl_FileEventObjCmd -- * - * This procedure implements the "fileevent" Tcl command. See the - * user documentation for details on what it does. This command is - * based on the Tk command "fileevent" which in turn is based on work - * contributed by Mark Diekhans. + * This procedure implements the "fileevent" Tcl command. See the user + * documentation for details on what it does. This command is based on + * the Tk command "fileevent" which in turn is based on work contributed + * by Mark Diekhans. * * Results: * A standard Tcl result. @@ -6672,22 +8718,21 @@ ChannelEventScriptInvoker(clientData, mask) /* ARGSUSED */ int -Tcl_FileEventObjCmd(clientData, interp, objc, objv) - ClientData clientData; /* Not used. */ - Tcl_Interp *interp; /* Interpreter in which the channel - * for which to create the handler - * is found. */ - int objc; /* Number of arguments. */ - Tcl_Obj *CONST objv[]; /* Argument objects. */ -{ - Channel *chanPtr; /* The channel to create - * the handler for. */ - Tcl_Channel chan; /* The opaque type for the channel. */ - char *chanName; - int modeIndex; /* Index of mode argument. */ +Tcl_FileEventObjCmd( + ClientData clientData, /* Not used. */ + Tcl_Interp *interp, /* Interpreter in which the channel for which + * to create the handler is found. */ + int objc, /* Number of arguments. */ + Tcl_Obj *const objv[]) /* Argument objects. */ +{ + Channel *chanPtr; /* The channel to create the handler for. */ + ChannelState *statePtr; /* State info for channel */ + Tcl_Channel chan; /* The opaque type for the channel. */ + const char *chanName; + int modeIndex; /* Index of mode argument. */ int mask; - static char *modeOptions[] = {"readable", "writable", NULL}; - static int maskArray[] = {TCL_READABLE, TCL_WRITABLE}; + static const char *const modeOptions[] = {"readable", "writable", NULL}; + static const int maskArray[] = {TCL_READABLE, TCL_WRITABLE}; if ((objc != 3) && (objc != 4)) { Tcl_WrongNumArgs(interp, 1, objv, "channelId event ?script?"); @@ -6699,694 +8744,212 @@ Tcl_FileEventObjCmd(clientData, interp, objc, objv) } mask = maskArray[modeIndex]; - chanName = Tcl_GetString(objv[1]); + chanName = TclGetString(objv[1]); chan = Tcl_GetChannel(interp, chanName, NULL); - if (chan == (Tcl_Channel) NULL) { + if (chan == NULL) { return TCL_ERROR; } chanPtr = (Channel *) chan; - if ((chanPtr->flags & mask) == 0) { - Tcl_AppendResult(interp, "channel is not ", - (mask == TCL_READABLE) ? "readable" : "writable", - (char *) NULL); - return TCL_ERROR; + statePtr = chanPtr->state; + if ((statePtr->flags & mask) == 0) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf("channel is not %s", + (mask == TCL_READABLE) ? "readable" : "writable")); + return TCL_ERROR; } - + /* * If we are supposed to return the script, do so. */ if (objc == 3) { EventScriptRecord *esPtr; - for (esPtr = chanPtr->scriptRecordPtr; - esPtr != (EventScriptRecord *) NULL; - esPtr = esPtr->nextPtr) { + + for (esPtr = statePtr->scriptRecordPtr; esPtr != NULL; + esPtr = esPtr->nextPtr) { if ((esPtr->interp == interp) && (esPtr->mask == mask)) { Tcl_SetObjResult(interp, esPtr->scriptPtr); break; } } - return TCL_OK; + return TCL_OK; } /* * If we are supposed to delete a stored script, do so. */ - if (*(Tcl_GetString(objv[3])) == '\0') { - DeleteScriptRecord(interp, chanPtr, mask); - return TCL_OK; + if (*(TclGetString(objv[3])) == '\0') { + DeleteScriptRecord(interp, chanPtr, mask); + return TCL_OK; } /* - * Make the script record that will link between the event and the - * script to invoke. This also creates a channel event handler which - * will evaluate the script in the supplied interpreter. + * Make the script record that will link between the event and the script + * to invoke. This also creates a channel event handler which will + * evaluate the script in the supplied interpreter. */ CreateScriptRecord(interp, chanPtr, mask, objv[3]); - + return TCL_OK; } /* *---------------------------------------------------------------------- * - * TclTestChannelCmd -- + * ZeroTransferTimerProc -- * - * Implements the Tcl "testchannel" debugging command and its - * subcommands. This is part of the testing environment but must be - * in this file instead of tclTest.c because it needs access to the - * fields of struct Channel. + * Timer handler scheduled by TclCopyChannel so that -command is + * called asynchronously even when -size is 0. * * Results: - * A standard Tcl result. + * None. * * Side effects: - * None. + * Calls CopyData for -command invocation. * *---------------------------------------------------------------------- */ - /* ARGSUSED */ -int -TclTestChannelCmd(clientData, interp, argc, argv) - ClientData clientData; /* Not used. */ - Tcl_Interp *interp; /* Interpreter for result. */ - int argc; /* Count of additional args. */ - char **argv; /* Additional arg strings. */ +static void +ZeroTransferTimerProc( + ClientData clientData) { - char *cmdName; /* Sub command. */ - Tcl_HashTable *hTblPtr; /* Hash table of channels. */ - Tcl_HashSearch hSearch; /* Search variable. */ - Tcl_HashEntry *hPtr; /* Search variable. */ - Channel *chanPtr; /* The actual channel. */ - Tcl_Channel chan; /* The opaque type. */ - size_t len; /* Length of subcommand string. */ - int IOQueued; /* How much IO is queued inside channel? */ - ChannelBuffer *bufPtr; /* For iterating over queued IO. */ - char buf[TCL_INTEGER_SPACE];/* For sprintf. */ - - if (argc < 2) { - Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], - " subcommand ?additional args..?\"", (char *) NULL); - return TCL_ERROR; - } - cmdName = argv[1]; - len = strlen(cmdName); - - chanPtr = (Channel *) NULL; - - if (argc > 2) { - chan = Tcl_GetChannel(interp, argv[2], NULL); - if (chan == (Tcl_Channel) NULL) { - return TCL_ERROR; - } - chanPtr = (Channel *) chan; - } - - - if ((cmdName[0] == 'i') && (strncmp(cmdName, "info", len) == 0)) { - if (argc != 3) { - Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], - " info channelName\"", (char *) NULL); - return TCL_ERROR; - } - Tcl_AppendElement(interp, argv[2]); - Tcl_AppendElement(interp, chanPtr->typePtr->typeName); - if (chanPtr->flags & TCL_READABLE) { - Tcl_AppendElement(interp, "read"); - } else { - Tcl_AppendElement(interp, ""); - } - if (chanPtr->flags & TCL_WRITABLE) { - Tcl_AppendElement(interp, "write"); - } else { - Tcl_AppendElement(interp, ""); - } - if (chanPtr->flags & CHANNEL_NONBLOCKING) { - Tcl_AppendElement(interp, "nonblocking"); - } else { - Tcl_AppendElement(interp, "blocking"); - } - if (chanPtr->flags & CHANNEL_LINEBUFFERED) { - Tcl_AppendElement(interp, "line"); - } else if (chanPtr->flags & CHANNEL_UNBUFFERED) { - Tcl_AppendElement(interp, "none"); - } else { - Tcl_AppendElement(interp, "full"); - } - if (chanPtr->flags & BG_FLUSH_SCHEDULED) { - Tcl_AppendElement(interp, "async_flush"); - } else { - Tcl_AppendElement(interp, ""); - } - if (chanPtr->flags & CHANNEL_EOF) { - Tcl_AppendElement(interp, "eof"); - } else { - Tcl_AppendElement(interp, ""); - } - if (chanPtr->flags & CHANNEL_BLOCKED) { - Tcl_AppendElement(interp, "blocked"); - } else { - Tcl_AppendElement(interp, "unblocked"); - } - if (chanPtr->inputTranslation == TCL_TRANSLATE_AUTO) { - Tcl_AppendElement(interp, "auto"); - if (chanPtr->flags & INPUT_SAW_CR) { - Tcl_AppendElement(interp, "saw_cr"); - } else { - Tcl_AppendElement(interp, ""); - } - } else if (chanPtr->inputTranslation == TCL_TRANSLATE_LF) { - Tcl_AppendElement(interp, "lf"); - Tcl_AppendElement(interp, ""); - } else if (chanPtr->inputTranslation == TCL_TRANSLATE_CR) { - Tcl_AppendElement(interp, "cr"); - Tcl_AppendElement(interp, ""); - } else if (chanPtr->inputTranslation == TCL_TRANSLATE_CRLF) { - Tcl_AppendElement(interp, "crlf"); - if (chanPtr->flags & INPUT_SAW_CR) { - Tcl_AppendElement(interp, "queued_cr"); - } else { - Tcl_AppendElement(interp, ""); - } - } - if (chanPtr->outputTranslation == TCL_TRANSLATE_AUTO) { - Tcl_AppendElement(interp, "auto"); - } else if (chanPtr->outputTranslation == TCL_TRANSLATE_LF) { - Tcl_AppendElement(interp, "lf"); - } else if (chanPtr->outputTranslation == TCL_TRANSLATE_CR) { - Tcl_AppendElement(interp, "cr"); - } else if (chanPtr->outputTranslation == TCL_TRANSLATE_CRLF) { - Tcl_AppendElement(interp, "crlf"); - } - for (IOQueued = 0, bufPtr = chanPtr->inQueueHead; - bufPtr != (ChannelBuffer *) NULL; - bufPtr = bufPtr->nextPtr) { - IOQueued += bufPtr->nextAdded - bufPtr->nextRemoved; - } - TclFormatInt(buf, IOQueued); - Tcl_AppendElement(interp, buf); - - IOQueued = 0; - if (chanPtr->curOutPtr != (ChannelBuffer *) NULL) { - IOQueued = chanPtr->curOutPtr->nextAdded - - chanPtr->curOutPtr->nextRemoved; - } - for (bufPtr = chanPtr->outQueueHead; - bufPtr != (ChannelBuffer *) NULL; - bufPtr = bufPtr->nextPtr) { - IOQueued += (bufPtr->nextAdded - bufPtr->nextRemoved); - } - TclFormatInt(buf, IOQueued); - Tcl_AppendElement(interp, buf); - - TclFormatInt(buf, Tcl_Tell((Tcl_Channel) chanPtr)); - Tcl_AppendElement(interp, buf); - - TclFormatInt(buf, chanPtr->refCount); - Tcl_AppendElement(interp, buf); - - return TCL_OK; - } - - if ((cmdName[0] == 'i') && - (strncmp(cmdName, "inputbuffered", len) == 0)) { - if (argc != 3) { - Tcl_AppendResult(interp, "channel name required", - (char *) NULL); - return TCL_ERROR; - } - - for (IOQueued = 0, bufPtr = chanPtr->inQueueHead; - bufPtr != (ChannelBuffer *) NULL; - bufPtr = bufPtr->nextPtr) { - IOQueued += bufPtr->nextAdded - bufPtr->nextRemoved; - } - TclFormatInt(buf, IOQueued); - Tcl_AppendResult(interp, buf, (char *) NULL); - return TCL_OK; - } - - if ((cmdName[0] == 'm') && (strncmp(cmdName, "mode", len) == 0)) { - if (argc != 3) { - Tcl_AppendResult(interp, "channel name required", - (char *) NULL); - return TCL_ERROR; - } - - if (chanPtr->flags & TCL_READABLE) { - Tcl_AppendElement(interp, "read"); - } else { - Tcl_AppendElement(interp, ""); - } - if (chanPtr->flags & TCL_WRITABLE) { - Tcl_AppendElement(interp, "write"); - } else { - Tcl_AppendElement(interp, ""); - } - return TCL_OK; - } - - if ((cmdName[0] == 'n') && (strncmp(cmdName, "name", len) == 0)) { - if (argc != 3) { - Tcl_AppendResult(interp, "channel name required", - (char *) NULL); - return TCL_ERROR; - } - Tcl_AppendResult(interp, chanPtr->channelName, (char *) NULL); - return TCL_OK; - } - - if ((cmdName[0] == 'o') && (strncmp(cmdName, "open", len) == 0)) { - hTblPtr = (Tcl_HashTable *) Tcl_GetAssocData(interp, "tclIO", NULL); - if (hTblPtr == (Tcl_HashTable *) NULL) { - return TCL_OK; - } - for (hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch); - hPtr != (Tcl_HashEntry *) NULL; - hPtr = Tcl_NextHashEntry(&hSearch)) { - Tcl_AppendElement(interp, Tcl_GetHashKey(hTblPtr, hPtr)); - } - return TCL_OK; - } - - if ((cmdName[0] == 'o') && - (strncmp(cmdName, "outputbuffered", len) == 0)) { - if (argc != 3) { - Tcl_AppendResult(interp, "channel name required", - (char *) NULL); - return TCL_ERROR; - } - - IOQueued = 0; - if (chanPtr->curOutPtr != (ChannelBuffer *) NULL) { - IOQueued = chanPtr->curOutPtr->nextAdded - - chanPtr->curOutPtr->nextRemoved; - } - for (bufPtr = chanPtr->outQueueHead; - bufPtr != (ChannelBuffer *) NULL; - bufPtr = bufPtr->nextPtr) { - IOQueued += (bufPtr->nextAdded - bufPtr->nextRemoved); - } - TclFormatInt(buf, IOQueued); - Tcl_AppendResult(interp, buf, (char *) NULL); - return TCL_OK; - } - - if ((cmdName[0] == 'q') && - (strncmp(cmdName, "queuedcr", len) == 0)) { - if (argc != 3) { - Tcl_AppendResult(interp, "channel name required", - (char *) NULL); - return TCL_ERROR; - } - - Tcl_AppendResult(interp, - (chanPtr->flags & INPUT_SAW_CR) ? "1" : "0", - (char *) NULL); - return TCL_OK; - } - - if ((cmdName[0] == 'r') && (strncmp(cmdName, "readable", len) == 0)) { - hTblPtr = (Tcl_HashTable *) Tcl_GetAssocData(interp, "tclIO", NULL); - if (hTblPtr == (Tcl_HashTable *) NULL) { - return TCL_OK; - } - for (hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch); - hPtr != (Tcl_HashEntry *) NULL; - hPtr = Tcl_NextHashEntry(&hSearch)) { - chanPtr = (Channel *) Tcl_GetHashValue(hPtr); - if (chanPtr->flags & TCL_READABLE) { - Tcl_AppendElement(interp, Tcl_GetHashKey(hTblPtr, hPtr)); - } - } - return TCL_OK; - } - - if ((cmdName[0] == 'r') && (strncmp(cmdName, "refcount", len) == 0)) { - if (argc != 3) { - Tcl_AppendResult(interp, "channel name required", - (char *) NULL); - return TCL_ERROR; - } - - TclFormatInt(buf, chanPtr->refCount); - Tcl_AppendResult(interp, buf, (char *) NULL); - return TCL_OK; - } - - if ((cmdName[0] == 't') && (strncmp(cmdName, "type", len) == 0)) { - if (argc != 3) { - Tcl_AppendResult(interp, "channel name required", - (char *) NULL); - return TCL_ERROR; - } - Tcl_AppendResult(interp, chanPtr->typePtr->typeName, (char *) NULL); - return TCL_OK; - } - - if ((cmdName[0] == 'w') && (strncmp(cmdName, "writable", len) == 0)) { - hTblPtr = (Tcl_HashTable *) Tcl_GetAssocData(interp, "tclIO", NULL); - if (hTblPtr == (Tcl_HashTable *) NULL) { - return TCL_OK; - } - for (hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch); - hPtr != (Tcl_HashEntry *) NULL; - hPtr = Tcl_NextHashEntry(&hSearch)) { - chanPtr = (Channel *) Tcl_GetHashValue(hPtr); - if (chanPtr->flags & TCL_WRITABLE) { - Tcl_AppendElement(interp, Tcl_GetHashKey(hTblPtr, hPtr)); - } - } - return TCL_OK; - } - - Tcl_AppendResult(interp, "bad option \"", cmdName, "\": should be ", - "info, open, readable, or writable", - (char *) NULL); - return TCL_ERROR; + /* calling CopyData with mask==0 still implies immediate invocation of the + * -command callback, and completion of the fcopy. + */ + CopyData(clientData, 0); } /* *---------------------------------------------------------------------- * - * TclTestChannelEventCmd -- + * TclCopyChannel -- * - * This procedure implements the "testchannelevent" command. It is - * used to test the Tcl channel event mechanism. It is present in - * this file instead of tclTest.c because it needs access to the - * internal structure of the channel. + * This routine copies data from one channel to another, either + * synchronously or asynchronously. If a command script is supplied, the + * operation runs in the background. The script is invoked when the copy + * completes. Otherwise the function waits until the copy is completed + * before returning. * * Results: * A standard Tcl result. * * Side effects: - * Creates, deletes and returns channel event handlers. + * May schedule a background copy operation that causes both channels to + * be marked busy. * *---------------------------------------------------------------------- */ - /* ARGSUSED */ int -TclTestChannelEventCmd(dummy, interp, argc, argv) - ClientData dummy; /* Not used. */ - Tcl_Interp *interp; /* Current interpreter. */ - int argc; /* Number of arguments. */ - char **argv; /* Argument strings. */ +TclCopyChannelOld( + Tcl_Interp *interp, /* Current interpreter. */ + Tcl_Channel inChan, /* Channel to read from. */ + Tcl_Channel outChan, /* Channel to write to. */ + int toRead, /* Amount of data to copy, or -1 for all. */ + Tcl_Obj *cmdPtr) /* Pointer to script to execute or NULL. */ { - Tcl_Obj *resultListPtr; - Channel *chanPtr; - EventScriptRecord *esPtr, *prevEsPtr, *nextEsPtr; - char *cmd; - int index, i, mask, len; - - if ((argc < 3) || (argc > 5)) { - Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], - " channelName cmd ?arg1? ?arg2?\"", (char *) NULL); - return TCL_ERROR; - } - chanPtr = (Channel *) Tcl_GetChannel(interp, argv[1], NULL); - if (chanPtr == (Channel *) NULL) { - return TCL_ERROR; - } - cmd = argv[2]; - len = strlen(cmd); - if ((cmd[0] == 'a') && (strncmp(cmd, "add", (unsigned) len) == 0)) { - if (argc != 5) { - Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], - " channelName add eventSpec script\"", (char *) NULL); - return TCL_ERROR; - } - if (strcmp(argv[3], "readable") == 0) { - mask = TCL_READABLE; - } else if (strcmp(argv[3], "writable") == 0) { - mask = TCL_WRITABLE; - } else if (strcmp(argv[3], "none") == 0) { - mask = 0; - } else { - Tcl_AppendResult(interp, "bad event name \"", argv[3], - "\": must be readable, writable, or none", (char *) NULL); - return TCL_ERROR; - } - - esPtr = (EventScriptRecord *) ckalloc((unsigned) - sizeof(EventScriptRecord)); - esPtr->nextPtr = chanPtr->scriptRecordPtr; - chanPtr->scriptRecordPtr = esPtr; - - esPtr->chanPtr = chanPtr; - esPtr->interp = interp; - esPtr->mask = mask; - esPtr->scriptPtr = Tcl_NewStringObj(argv[4], -1); - Tcl_IncrRefCount(esPtr->scriptPtr); - - Tcl_CreateChannelHandler((Tcl_Channel) chanPtr, mask, - ChannelEventScriptInvoker, (ClientData) esPtr); - - return TCL_OK; - } - - if ((cmd[0] == 'd') && (strncmp(cmd, "delete", (unsigned) len) == 0)) { - if (argc != 4) { - Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], - " channelName delete index\"", (char *) NULL); - return TCL_ERROR; - } - if (Tcl_GetInt(interp, argv[3], &index) == TCL_ERROR) { - return TCL_ERROR; - } - if (index < 0) { - Tcl_AppendResult(interp, "bad event index: ", argv[3], - ": must be nonnegative", (char *) NULL); - return TCL_ERROR; - } - for (i = 0, esPtr = chanPtr->scriptRecordPtr; - (i < index) && (esPtr != (EventScriptRecord *) NULL); - i++, esPtr = esPtr->nextPtr) { - /* Empty loop body. */ - } - if (esPtr == (EventScriptRecord *) NULL) { - Tcl_AppendResult(interp, "bad event index ", argv[3], - ": out of range", (char *) NULL); - return TCL_ERROR; - } - if (esPtr == chanPtr->scriptRecordPtr) { - chanPtr->scriptRecordPtr = esPtr->nextPtr; - } else { - for (prevEsPtr = chanPtr->scriptRecordPtr; - (prevEsPtr != (EventScriptRecord *) NULL) && - (prevEsPtr->nextPtr != esPtr); - prevEsPtr = prevEsPtr->nextPtr) { - /* Empty loop body. */ - } - if (prevEsPtr == (EventScriptRecord *) NULL) { - panic("TclTestChannelEventCmd: damaged event script list"); - } - prevEsPtr->nextPtr = esPtr->nextPtr; - } - Tcl_DeleteChannelHandler((Tcl_Channel) chanPtr, - ChannelEventScriptInvoker, (ClientData) esPtr); - Tcl_DecrRefCount(esPtr->scriptPtr); - ckfree((char *) esPtr); - - return TCL_OK; - } - - if ((cmd[0] == 'l') && (strncmp(cmd, "list", (unsigned) len) == 0)) { - if (argc != 3) { - Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], - " channelName list\"", (char *) NULL); - return TCL_ERROR; - } - resultListPtr = Tcl_GetObjResult(interp); - for (esPtr = chanPtr->scriptRecordPtr; - esPtr != (EventScriptRecord *) NULL; - esPtr = esPtr->nextPtr) { - if (esPtr->mask) { - Tcl_ListObjAppendElement(interp, resultListPtr, Tcl_NewStringObj( - (esPtr->mask == TCL_READABLE) ? "readable" : "writable", -1)); - } else { - Tcl_ListObjAppendElement(interp, resultListPtr, - Tcl_NewStringObj("none", -1)); - } - Tcl_ListObjAppendElement(interp, resultListPtr, esPtr->scriptPtr); - } - Tcl_SetObjResult(interp, resultListPtr); - return TCL_OK; - } - - if ((cmd[0] == 'r') && (strncmp(cmd, "removeall", (unsigned) len) == 0)) { - if (argc != 3) { - Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], - " channelName removeall\"", (char *) NULL); - return TCL_ERROR; - } - for (esPtr = chanPtr->scriptRecordPtr; - esPtr != (EventScriptRecord *) NULL; - esPtr = nextEsPtr) { - nextEsPtr = esPtr->nextPtr; - Tcl_DeleteChannelHandler((Tcl_Channel) chanPtr, - ChannelEventScriptInvoker, (ClientData) esPtr); - Tcl_DecrRefCount(esPtr->scriptPtr); - ckfree((char *) esPtr); - } - chanPtr->scriptRecordPtr = (EventScriptRecord *) NULL; - return TCL_OK; - } - - if ((cmd[0] == 's') && (strncmp(cmd, "set", (unsigned) len) == 0)) { - if (argc != 5) { - Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], - " channelName delete index event\"", (char *) NULL); - return TCL_ERROR; - } - if (Tcl_GetInt(interp, argv[3], &index) == TCL_ERROR) { - return TCL_ERROR; - } - if (index < 0) { - Tcl_AppendResult(interp, "bad event index: ", argv[3], - ": must be nonnegative", (char *) NULL); - return TCL_ERROR; - } - for (i = 0, esPtr = chanPtr->scriptRecordPtr; - (i < index) && (esPtr != (EventScriptRecord *) NULL); - i++, esPtr = esPtr->nextPtr) { - /* Empty loop body. */ - } - if (esPtr == (EventScriptRecord *) NULL) { - Tcl_AppendResult(interp, "bad event index ", argv[3], - ": out of range", (char *) NULL); - return TCL_ERROR; - } - - if (strcmp(argv[4], "readable") == 0) { - mask = TCL_READABLE; - } else if (strcmp(argv[4], "writable") == 0) { - mask = TCL_WRITABLE; - } else if (strcmp(argv[4], "none") == 0) { - mask = 0; - } else { - Tcl_AppendResult(interp, "bad event name \"", argv[4], - "\": must be readable, writable, or none", (char *) NULL); - return TCL_ERROR; - } - esPtr->mask = mask; - Tcl_CreateChannelHandler((Tcl_Channel) chanPtr, mask, - ChannelEventScriptInvoker, (ClientData) esPtr); - return TCL_OK; - } - Tcl_AppendResult(interp, "bad command ", cmd, ", must be one of ", - "add, delete, list, set, or removeall", (char *) NULL); - return TCL_ERROR; + return TclCopyChannel(interp, inChan, outChan, (Tcl_WideInt) toRead, + cmdPtr); } - -/* - *---------------------------------------------------------------------- - * - * TclCopyChannel -- - * - * This routine copies data from one channel to another, either - * synchronously or asynchronously. If a command script is - * supplied, the operation runs in the background. The script - * is invoked when the copy completes. Otherwise the function - * waits until the copy is completed before returning. - * - * Results: - * A standard Tcl result. - * - * Side effects: - * May schedule a background copy operation that causes both - * channels to be marked busy. - * - *---------------------------------------------------------------------- - */ int -TclCopyChannel(interp, inChan, outChan, toRead, cmdPtr) - Tcl_Interp *interp; /* Current interpreter. */ - Tcl_Channel inChan; /* Channel to read from. */ - Tcl_Channel outChan; /* Channel to write to. */ - int toRead; /* Amount of data to copy, or -1 for all. */ - Tcl_Obj *cmdPtr; /* Pointer to script to execute or NULL. */ +TclCopyChannel( + Tcl_Interp *interp, /* Current interpreter. */ + Tcl_Channel inChan, /* Channel to read from. */ + Tcl_Channel outChan, /* Channel to write to. */ + Tcl_WideInt toRead, /* Amount of data to copy, or -1 for all. */ + Tcl_Obj *cmdPtr) /* Pointer to script to execute or NULL. */ { Channel *inPtr = (Channel *) inChan; Channel *outPtr = (Channel *) outChan; + ChannelState *inStatePtr, *outStatePtr; int readFlags, writeFlags; CopyState *csPtr; int nonBlocking = (cmdPtr) ? CHANNEL_NONBLOCKING : 0; - if (inPtr->csPtr) { - Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "channel \"", - Tcl_GetChannelName(inChan), "\" is busy", NULL); + inStatePtr = inPtr->state; + outStatePtr = outPtr->state; + + if (BUSY_STATE(inStatePtr, TCL_READABLE)) { + if (interp) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "channel \"%s\" is busy", Tcl_GetChannelName(inChan))); + } return TCL_ERROR; } - if (outPtr->csPtr) { - Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "channel \"", - Tcl_GetChannelName(outChan), "\" is busy", NULL); + if (BUSY_STATE(outStatePtr, TCL_WRITABLE)) { + if (interp) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "channel \"%s\" is busy", Tcl_GetChannelName(outChan))); + } return TCL_ERROR; } - readFlags = inPtr->flags; - writeFlags = outPtr->flags; + readFlags = inStatePtr->flags; + writeFlags = outStatePtr->flags; /* - * Set up the blocking mode appropriately. Background copies need - * non-blocking channels. Foreground copies need blocking channels. - * If there is an error, restore the old blocking mode. + * Set up the blocking mode appropriately. Background copies need + * non-blocking channels. Foreground copies need blocking channels. If + * there is an error, restore the old blocking mode. */ if (nonBlocking != (readFlags & CHANNEL_NONBLOCKING)) { - if (SetBlockMode(interp, inPtr, - nonBlocking ? TCL_MODE_NONBLOCKING : TCL_MODE_BLOCKING) - != TCL_OK) { + if (SetBlockMode(interp, inPtr, nonBlocking ? + TCL_MODE_NONBLOCKING : TCL_MODE_BLOCKING) != TCL_OK) { return TCL_ERROR; } - } - if (inPtr != outPtr) { - if (nonBlocking != (writeFlags & CHANNEL_NONBLOCKING)) { - if (SetBlockMode(NULL, outPtr, - nonBlocking ? TCL_MODE_BLOCKING : TCL_MODE_NONBLOCKING) - != TCL_OK) { - if (nonBlocking != (readFlags & CHANNEL_NONBLOCKING)) { - SetBlockMode(NULL, inPtr, - (readFlags & CHANNEL_NONBLOCKING) - ? TCL_MODE_NONBLOCKING : TCL_MODE_BLOCKING); - return TCL_ERROR; - } - } - } + } + if ((inPtr!=outPtr) && (nonBlocking!=(writeFlags&CHANNEL_NONBLOCKING)) && + (SetBlockMode(NULL, outPtr, nonBlocking ? + TCL_MODE_NONBLOCKING : TCL_MODE_BLOCKING) != TCL_OK) && + (nonBlocking != (readFlags & CHANNEL_NONBLOCKING))) { + SetBlockMode(NULL, inPtr, (readFlags & CHANNEL_NONBLOCKING) + ? TCL_MODE_NONBLOCKING : TCL_MODE_BLOCKING); + return TCL_ERROR; } /* * Make sure the output side is unbuffered. */ - outPtr->flags = (outPtr->flags & ~(CHANNEL_LINEBUFFERED)) - | CHANNEL_UNBUFFERED; + outStatePtr->flags = (outStatePtr->flags & ~CHANNEL_LINEBUFFERED) + | CHANNEL_UNBUFFERED; /* * Allocate a new CopyState to maintain info about the current copy in - * progress. This structure will be deallocated when the copy is + * progress. This structure will be deallocated when the copy is * completed. */ - csPtr = (CopyState*) ckalloc(sizeof(CopyState) + inPtr->bufSize); - csPtr->bufSize = inPtr->bufSize; + csPtr = ckalloc(sizeof(CopyState) + inStatePtr->bufSize); + csPtr->bufSize = inStatePtr->bufSize; csPtr->readPtr = inPtr; csPtr->writePtr = outPtr; csPtr->readFlags = readFlags; csPtr->writeFlags = writeFlags; csPtr->toRead = toRead; - csPtr->total = 0; + csPtr->total = (Tcl_WideInt) 0; csPtr->interp = interp; if (cmdPtr) { Tcl_IncrRefCount(cmdPtr); } csPtr->cmdPtr = cmdPtr; - inPtr->csPtr = csPtr; - outPtr->csPtr = csPtr; + + inStatePtr->csPtrR = csPtr; + outStatePtr->csPtrW = csPtr; + + /* + * Special handling of -size 0 async transfers, so that the -command is + * still called asynchronously. + */ + + if ((nonBlocking == CHANNEL_NONBLOCKING) && (toRead == 0)) { + Tcl_CreateTimerHandler(0, ZeroTransferTimerProc, csPtr); + return 0; + } /* * Start copying data between the channels. @@ -7400,8 +8963,8 @@ TclCopyChannel(interp, inChan, outChan, toRead, cmdPtr) * * CopyData -- * - * This function implements the lowest level of the copying - * mechanism for TclCopyChannel. + * This function implements the lowest level of the copying mechanism for + * TclCopyChannel. * * Results: * Returns TCL_OK on success, else TCL_ERROR. @@ -7413,115 +8976,191 @@ TclCopyChannel(interp, inChan, outChan, toRead, cmdPtr) */ static int -CopyData(csPtr, mask) - CopyState *csPtr; /* State of copy operation. */ - int mask; /* Current channel event flags. */ +CopyData( + CopyState *csPtr, /* State of copy operation. */ + int mask) /* Current channel event flags. */ { Tcl_Interp *interp; - Tcl_Obj *cmdPtr, *errObj = NULL; + Tcl_Obj *cmdPtr, *errObj = NULL, *bufObj = NULL, *msg = NULL; Tcl_Channel inChan, outChan; - int result = TCL_OK; - int size; - int total; - - inChan = (Tcl_Channel)csPtr->readPtr; - outChan = (Tcl_Channel)csPtr->writePtr; - interp = csPtr->interp; - cmdPtr = csPtr->cmdPtr; + ChannelState *inStatePtr, *outStatePtr; + int result = TCL_OK, size, sizeb; + Tcl_WideInt total; + const char *buffer; + int inBinary, outBinary, sameEncoding; + /* Encoding control */ + int underflow; /* Input underflow */ + + inChan = (Tcl_Channel) csPtr->readPtr; + outChan = (Tcl_Channel) csPtr->writePtr; + inStatePtr = csPtr->readPtr->state; + outStatePtr = csPtr->writePtr->state; + interp = csPtr->interp; + cmdPtr = csPtr->cmdPtr; /* * Copy the data the slow way, using the translation mechanism. + * + * Note: We have make sure that we use the topmost channel in a stack for + * the copying. The caller uses Tcl_GetChannel to access it, and thus gets + * the bottom of the stack. */ - while (csPtr->toRead != 0) { + inBinary = (inStatePtr->encoding == NULL); + outBinary = (outStatePtr->encoding == NULL); + sameEncoding = (inStatePtr->encoding == outStatePtr->encoding); + if (!(inBinary || sameEncoding)) { + TclNewObj(bufObj); + Tcl_IncrRefCount(bufObj); + } + + while (csPtr->toRead != (Tcl_WideInt) 0) { /* * Check for unreported background errors. */ - if (csPtr->readPtr->unreportedError != 0) { - Tcl_SetErrno(csPtr->readPtr->unreportedError); - csPtr->readPtr->unreportedError = 0; + Tcl_GetChannelError(inChan, &msg); + if ((inStatePtr->unreportedError != 0) || (msg != NULL)) { + Tcl_SetErrno(inStatePtr->unreportedError); + inStatePtr->unreportedError = 0; goto readError; } - if (csPtr->writePtr->unreportedError != 0) { - Tcl_SetErrno(csPtr->writePtr->unreportedError); - csPtr->writePtr->unreportedError = 0; + Tcl_GetChannelError(outChan, &msg); + if ((outStatePtr->unreportedError != 0) || (msg != NULL)) { + Tcl_SetErrno(outStatePtr->unreportedError); + outStatePtr->unreportedError = 0; goto writeError; } - - /* - * Read up to bufSize bytes. - */ - if ((csPtr->toRead == -1) - || (csPtr->toRead > csPtr->bufSize)) { - size = csPtr->bufSize; + if (cmdPtr && (mask == 0)) { + /* + * In async mode, we skip reading synchronously and fake an + * underflow instead to prime the readable fileevent. + */ + + size = 0; + underflow = 1; } else { - size = csPtr->toRead; + /* + * Read up to bufSize bytes. + */ + + if ((csPtr->toRead == (Tcl_WideInt) -1) + || (csPtr->toRead > (Tcl_WideInt) csPtr->bufSize)) { + sizeb = csPtr->bufSize; + } else { + sizeb = (int) csPtr->toRead; + } + + if (inBinary || sameEncoding) { + size = DoRead(inStatePtr->topChanPtr, csPtr->buffer, sizeb, + !GotFlag(inStatePtr, CHANNEL_NONBLOCKING)); + } else { + size = DoReadChars(inStatePtr->topChanPtr, bufObj, sizeb, + 0 /* No append */); + } + underflow = (size >= 0) && (size < sizeb); /* Input underflow */ } - size = DoRead(csPtr->readPtr, csPtr->buffer, size); if (size < 0) { - readError: - errObj = Tcl_NewObj(); - Tcl_AppendStringsToObj(errObj, "error reading \"", - Tcl_GetChannelName(inChan), "\": ", - Tcl_PosixError(interp), (char *) NULL); + readError: + if (interp) { + TclNewObj(errObj); + Tcl_AppendStringsToObj(errObj, "error reading \"", + Tcl_GetChannelName(inChan), "\": ", NULL); + if (msg != NULL) { + Tcl_AppendObjToObj(errObj, msg); + } else { + Tcl_AppendStringsToObj(errObj, Tcl_PosixError(interp), + NULL); + } + } + if (msg != NULL) { + Tcl_DecrRefCount(msg); + } break; - } else if (size == 0) { + } else if (underflow) { /* - * We had an underflow on the read side. If we are at EOF, - * then the copying is done, otherwise set up a channel - * handler to detect when the channel becomes readable again. + * We had an underflow on the read side. If we are at EOF, and not + * in the synchronous part of an asynchronous fcopy, then the + * copying is done, otherwise set up a channel handler to detect + * when the channel becomes readable again. */ - - if (Tcl_Eof(inChan)) { + + if ((size == 0) && Tcl_Eof(inChan) && !(cmdPtr && (mask == 0))) { break; - } else if (!(mask & TCL_READABLE)) { + } + if (cmdPtr && (!Tcl_Eof(inChan) || (mask == 0)) && + !(mask & TCL_READABLE)) { if (mask & TCL_WRITABLE) { - Tcl_DeleteChannelHandler(outChan, CopyEventProc, - (ClientData) csPtr); + Tcl_DeleteChannelHandler(outChan, CopyEventProc, csPtr); } - Tcl_CreateChannelHandler(inChan, TCL_READABLE, - CopyEventProc, (ClientData) csPtr); + Tcl_CreateChannelHandler(inChan, TCL_READABLE, CopyEventProc, + csPtr); + } + if (size == 0) { + if (bufObj != NULL) { + TclDecrRefCount(bufObj); + bufObj = NULL; + } + return TCL_OK; } - return TCL_OK; } /* * Now write the buffer out. */ - size = DoWrite(csPtr->writePtr, csPtr->buffer, size); - if (size < 0) { - writeError: - errObj = Tcl_NewObj(); - Tcl_AppendStringsToObj(errObj, "error writing \"", - Tcl_GetChannelName(outChan), "\": ", - Tcl_PosixError(interp), (char *) NULL); - break; + if (inBinary || sameEncoding) { + buffer = csPtr->buffer; + sizeb = size; + } else { + buffer = TclGetStringFromObj(bufObj, &sizeb); + } + + if (outBinary || sameEncoding) { + sizeb = WriteBytes(outStatePtr->topChanPtr, buffer, sizeb); + } else { + sizeb = WriteChars(outStatePtr->topChanPtr, buffer, sizeb); } /* - * Check to see if the write is happening in the background. If so, - * stop copying and wait for the channel to become writable again. + * [Bug 2895565]. At this point 'size' still contains the number of + * bytes or characters which have been read. We keep this to later to + * update the totals and toRead information, see marker (UP) below. We + * must not overwrite it with 'sizeb', which is the number of written + * bytes or characters, and both EOL translation and encoding + * conversion may have changed this number unpredictably in relation + * to 'size' (It can be smaller or larger, in the latter case able to + * drive toRead below -1, causing infinite looping). Completely + * unsuitable for updating totals and toRead. */ - if (csPtr->writePtr->flags & BG_FLUSH_SCHEDULED) { - if (!(mask & TCL_WRITABLE)) { - if (mask & TCL_READABLE) { - Tcl_DeleteChannelHandler(outChan, CopyEventProc, - (ClientData) csPtr); + if (sizeb < 0) { + writeError: + if (interp) { + TclNewObj(errObj); + Tcl_AppendStringsToObj(errObj, "error writing \"", + Tcl_GetChannelName(outChan), "\": ", NULL); + if (msg != NULL) { + Tcl_AppendObjToObj(errObj, msg); + } else { + Tcl_AppendStringsToObj(errObj, Tcl_PosixError(interp), + NULL); } - Tcl_CreateChannelHandler(outChan, TCL_WRITABLE, - CopyEventProc, (ClientData) csPtr); } - return TCL_OK; + if (msg != NULL) { + Tcl_DecrRefCount(msg); + } + break; } /* - * Update the current byte count if we care. + * Update the current byte count. Do it now so the count is valid + * before a return or break takes us out of the loop. The invariant at + * the top of the loop should be that csPtr->toRead holds the number + * of bytes left to copy. */ if (csPtr->toRead != -1) { @@ -7530,60 +9169,104 @@ CopyData(csPtr, mask) csPtr->total += size; /* - * For background copies, we only do one buffer per invocation so - * we don't starve the rest of the system. + * Break loop if EOF && (size>0) + */ + + if (Tcl_Eof(inChan)) { + break; + } + + /* + * Check to see if the write is happening in the background. If so, + * stop copying and wait for the channel to become writable again. + * After input underflow we already installed a readable handler + * therefore we don't need a writable handler. */ - if (cmdPtr) { + if (!underflow && GotFlag(outStatePtr, BG_FLUSH_SCHEDULED)) { + if (!(mask & TCL_WRITABLE)) { + if (mask & TCL_READABLE) { + Tcl_DeleteChannelHandler(inChan, CopyEventProc, csPtr); + } + Tcl_CreateChannelHandler(outChan, TCL_WRITABLE, + CopyEventProc, csPtr); + } + if (bufObj != NULL) { + TclDecrRefCount(bufObj); + bufObj = NULL; + } + return TCL_OK; + } + + /* + * For background copies, we only do one buffer per invocation so we + * don't starve the rest of the system. + */ + + if (cmdPtr && (csPtr->toRead != 0)) { /* - * The first time we enter this code, there won't be a - * channel handler established yet, so do it here. + * The first time we enter this code, there won't be a channel + * handler established yet, so do it here. */ if (mask == 0) { - Tcl_CreateChannelHandler(outChan, TCL_WRITABLE, - CopyEventProc, (ClientData) csPtr); + Tcl_CreateChannelHandler(outChan, TCL_WRITABLE, CopyEventProc, + csPtr); + } + if (bufObj != NULL) { + TclDecrRefCount(bufObj); + bufObj = NULL; } return TCL_OK; } + } /* while */ + + if (bufObj != NULL) { + TclDecrRefCount(bufObj); + bufObj = NULL; } /* - * Make the callback or return the number of bytes transferred. - * The local total is used because StopCopy frees csPtr. + * Make the callback or return the number of bytes transferred. The local + * total is used because StopCopy frees csPtr. */ total = csPtr->total; - if (cmdPtr) { + if (cmdPtr && interp) { + int code; + /* - * Get a private copy of the command so we can mutate it - * by adding arguments. Note that StopCopy frees our saved - * reference to the original command obj. + * Get a private copy of the command so we can mutate it by adding + * arguments. Note that StopCopy frees our saved reference to the + * original command obj. */ cmdPtr = Tcl_DuplicateObj(cmdPtr); Tcl_IncrRefCount(cmdPtr); StopCopy(csPtr); - Tcl_Preserve((ClientData) interp); + Tcl_Preserve(interp); - Tcl_ListObjAppendElement(interp, cmdPtr, Tcl_NewIntObj(total)); + Tcl_ListObjAppendElement(interp, cmdPtr, Tcl_NewWideIntObj(total)); if (errObj) { Tcl_ListObjAppendElement(interp, cmdPtr, errObj); } - if (Tcl_EvalObjEx(interp, cmdPtr, TCL_EVAL_GLOBAL) != TCL_OK) { - Tcl_BackgroundError(interp); + code = Tcl_EvalObjEx(interp, cmdPtr, TCL_EVAL_GLOBAL); + if (code != TCL_OK) { + Tcl_BackgroundException(interp, code); result = TCL_ERROR; } - Tcl_DecrRefCount(cmdPtr); - Tcl_Release((ClientData) interp); + TclDecrRefCount(cmdPtr); + Tcl_Release(interp); } else { StopCopy(csPtr); - if (errObj) { - Tcl_SetObjResult(interp, errObj); - result = TCL_ERROR; - } else { - Tcl_ResetResult(interp); - Tcl_SetIntObj(Tcl_GetObjResult(interp), total); + if (interp) { + if (errObj) { + Tcl_SetObjResult(interp, errObj); + result = TCL_ERROR; + } else { + Tcl_ResetResult(interp); + Tcl_SetObjResult(interp, Tcl_NewWideIntObj(total)); + } } } return result; @@ -7594,11 +9277,12 @@ CopyData(csPtr, mask) * * DoRead -- * - * Reads a given number of bytes from a channel. + * Reads a given number of bytes from a channel. No encoding conversions + * are applied to the bytes being read. * * Results: - * The number of characters read, or -1 on error. Use Tcl_GetErrno() - * to retrieve the error code for the error that occurred. + * The number of characters read, or -1 on error. Use Tcl_GetErrno() to + * retrieve the error code for the error that occurred. * * Side effects: * May cause input to be buffered. @@ -7607,60 +9291,68 @@ CopyData(csPtr, mask) */ static int -DoRead(chanPtr, bufPtr, toRead) - Channel *chanPtr; /* The channel from which to read. */ - char *bufPtr; /* Where to store input read. */ - int toRead; /* Maximum number of bytes to read. */ -{ - int copied; /* How many characters were copied into - * the result string? */ - int copiedNow; /* How many characters were copied from - * the current input buffer? */ +DoRead( + Channel *chanPtr, /* The channel from which to read. */ + char *bufPtr, /* Where to store input read. */ + int toRead, /* Maximum number of bytes to read. */ + int allowShortReads) /* Allow half-blocking (pipes,sockets) */ +{ + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ + int copied; /* How many characters were copied into the + * result string? */ + int copiedNow; /* How many characters were copied from the + * current input buffer? */ int result; /* Of calling GetInput. */ - + /* - * If we have not encountered a sticky EOF, clear the EOF bit. Either - * way clear the BLOCKED bit. We want to discover these anew during - * each operation. + * If we have not encountered a sticky EOF, clear the EOF bit. Either way + * clear the BLOCKED bit. We want to discover these anew during each + * operation. */ - if (!(chanPtr->flags & CHANNEL_STICKY_EOF)) { - chanPtr->flags &= ~CHANNEL_EOF; + Tcl_Preserve(chanPtr); + if (!GotFlag(statePtr, CHANNEL_STICKY_EOF)) { + ResetFlag(statePtr, CHANNEL_EOF); } - chanPtr->flags &= ~(CHANNEL_BLOCKED | CHANNEL_NEED_MORE_DATA); - + ResetFlag(statePtr, CHANNEL_BLOCKED | CHANNEL_NEED_MORE_DATA); + for (copied = 0; copied < toRead; copied += copiedNow) { - copiedNow = CopyAndTranslateBuffer(chanPtr, bufPtr + copied, - toRead - copied); - if (copiedNow == 0) { - if (chanPtr->flags & CHANNEL_EOF) { + copiedNow = CopyAndTranslateBuffer(statePtr, bufPtr + copied, + toRead - copied); + if (copiedNow == 0) { + if (GotFlag(statePtr, CHANNEL_EOF)) { goto done; - } - if (chanPtr->flags & CHANNEL_BLOCKED) { - if (chanPtr->flags & CHANNEL_NONBLOCKING) { + } + if (GotFlag(statePtr, CHANNEL_BLOCKED)) { + if (GotFlag(statePtr, CHANNEL_NONBLOCKING)) { goto done; - } - chanPtr->flags &= (~(CHANNEL_BLOCKED)); - } - result = GetInput(chanPtr); - if (result != 0) { - if (result != EAGAIN) { - copied = -1; - } + } + ResetFlag(statePtr, CHANNEL_BLOCKED); + } + result = GetInput(chanPtr); + if (result != 0) { + if (result != EAGAIN) { + copied = -1; + } goto done; - } + } + } else if (allowShortReads) { + copied += copiedNow; + break; } } - chanPtr->flags &= (~(CHANNEL_BLOCKED)); + ResetFlag(statePtr, CHANNEL_BLOCKED); - done: /* - * Update the notifier state so we don't block while there is still - * data in the buffers. + * Update the notifier state so we don't block while there is still data + * in the buffers. */ + done: UpdateInterest(chanPtr); + Tcl_Release(chanPtr); return copied; } @@ -7669,13 +9361,13 @@ DoRead(chanPtr, bufPtr, toRead) * * CopyAndTranslateBuffer -- * - * Copy at most one buffer of input to the result space, doing - * eol translations according to mode in effect currently. + * Copy at most one buffer of input to the result space, doing eol + * translations according to mode in effect currently. * * Results: - * Number of bytes stored in the result buffer (as opposed to the - * number of bytes read from the channel). May return - * zero if no input is available to be translated. + * Number of bytes stored in the result buffer (as opposed to the number + * of bytes read from the channel). May return zero if no input is + * available to be translated. * * Side effects: * Consumes buffered input. May deallocate one buffer. @@ -7684,220 +9376,208 @@ DoRead(chanPtr, bufPtr, toRead) */ static int -CopyAndTranslateBuffer(chanPtr, result, space) - Channel *chanPtr; /* The channel from which to read input. */ - char *result; /* Where to store the copied input. */ - int space; /* How many bytes are available in result - * to store the copied input? */ -{ - int bytesInBuffer; /* How many bytes are available to be - * copied in the current input buffer? */ - int copied; /* How many characters were already copied - * into the destination space? */ +CopyAndTranslateBuffer( + ChannelState *statePtr, /* Channel state from which to read input. */ + char *result, /* Where to store the copied input. */ + int space) /* How many bytes are available in result to + * store the copied input? */ +{ ChannelBuffer *bufPtr; /* The buffer from which to copy bytes. */ - int i; /* Iterates over the copied input looking - * for the input eofChar. */ - + int bytesInBuffer; /* How many bytes are available to be copied + * in the current input buffer? */ + int copied; /* How many characters were already copied + * into the destination space? */ + int i; /* Iterates over the copied input looking for + * the input eofChar. */ + /* * If there is no input at all, return zero. The invariant is that either - * there is no buffer in the queue, or if the first buffer is empty, it - * is also the last buffer (and thus there is no input in the queue). - * Note also that if the buffer is empty, we leave it in the queue. + * there is no buffer in the queue, or if the first buffer is empty, it is + * also the last buffer (and thus there is no input in the queue). Note + * also that if the buffer is empty, we leave it in the queue. */ - - if (chanPtr->inQueueHead == (ChannelBuffer *) NULL) { - return 0; + + if (statePtr->inQueueHead == NULL) { + return 0; } - bufPtr = chanPtr->inQueueHead; - bytesInBuffer = bufPtr->nextAdded - bufPtr->nextRemoved; + bufPtr = statePtr->inQueueHead; + bytesInBuffer = BytesLeft(bufPtr); copied = 0; - switch (chanPtr->inputTranslation) { - case TCL_TRANSLATE_LF: { - if (bytesInBuffer == 0) { - return 0; - } + switch (statePtr->inputTranslation) { + case TCL_TRANSLATE_LF: + if (bytesInBuffer == 0) { + return 0; + } - /* - * Copy the current chunk into the result buffer. - */ + /* + * Copy the current chunk into the result buffer. + */ + + if (bytesInBuffer < space) { + space = bytesInBuffer; + } + memcpy(result, RemovePoint(bufPtr), (size_t) space); + bufPtr->nextRemoved += space; + copied = space; + break; + case TCL_TRANSLATE_CR: { + char *end; + + if (bytesInBuffer == 0) { + return 0; + } + + /* + * Copy the current chunk into the result buffer, then replace all \r + * with \n. + */ - if (bytesInBuffer < space) { - space = bytesInBuffer; + if (bytesInBuffer < space) { + space = bytesInBuffer; + } + memcpy(result, RemovePoint(bufPtr), (size_t) space); + bufPtr->nextRemoved += space; + copied = space; + + for (end = result + copied; result < end; result++) { + if (*result == '\r') { + *result = '\n'; } - memcpy((VOID *) result, - (VOID *) (bufPtr->buf + bufPtr->nextRemoved), - (size_t) space); - bufPtr->nextRemoved += space; - copied = space; - break; } - case TCL_TRANSLATE_CR: { - char *end; - - if (bytesInBuffer == 0) { - return 0; - } + break; + } + case TCL_TRANSLATE_CRLF: { + char *src, *end, *dst; + int curByte; - /* - * Copy the current chunk into the result buffer, then - * replace all \r with \n. - */ + /* + * If there is a held-back "\r" at EOF, produce it now. + */ - if (bytesInBuffer < space) { - space = bytesInBuffer; + if (bytesInBuffer == 0) { + if ((statePtr->flags & (INPUT_SAW_CR | CHANNEL_EOF)) == + (INPUT_SAW_CR | CHANNEL_EOF)) { + result[0] = '\r'; + ResetFlag(statePtr, INPUT_SAW_CR); + return 1; } - memcpy((VOID *) result, - (VOID *) (bufPtr->buf + bufPtr->nextRemoved), - (size_t) space); - bufPtr->nextRemoved += space; - copied = space; - - for (end = result + copied; result < end; result++) { - if (*result == '\r') { - *result = '\n'; - } - } - break; + return 0; } - case TCL_TRANSLATE_CRLF: { - char *src, *end, *dst; - int curByte; - - /* - * If there is a held-back "\r" at EOF, produce it now. - */ - - if (bytesInBuffer == 0) { - if ((chanPtr->flags & (INPUT_SAW_CR | CHANNEL_EOF)) == - (INPUT_SAW_CR | CHANNEL_EOF)) { - result[0] = '\r'; - chanPtr->flags &= ~INPUT_SAW_CR; - return 1; - } - return 0; - } - /* - * Copy the current chunk and replace "\r\n" with "\n" - * (but not standalone "\r"!). - */ + /* + * Copy the current chunk and replace "\r\n" with "\n" (but not + * standalone "\r"!). + */ - if (bytesInBuffer < space) { - space = bytesInBuffer; + if (bytesInBuffer < space) { + space = bytesInBuffer; + } + memcpy(result, RemovePoint(bufPtr), (size_t) space); + bufPtr->nextRemoved += space; + copied = space; + + end = result + copied; + dst = result; + for (src = result; src < end; src++) { + curByte = *src; + if (curByte == '\n') { + ResetFlag(statePtr, INPUT_SAW_CR); + } else if (GotFlag(statePtr, INPUT_SAW_CR)) { + ResetFlag(statePtr, INPUT_SAW_CR); + *dst = '\r'; + dst++; } - memcpy((VOID *) result, - (VOID *) (bufPtr->buf + bufPtr->nextRemoved), - (size_t) space); - bufPtr->nextRemoved += space; - copied = space; - - end = result + copied; - dst = result; - for (src = result; src < end; src++) { - curByte = *src; - if (curByte == '\n') { - chanPtr->flags &= ~INPUT_SAW_CR; - } else if (chanPtr->flags & INPUT_SAW_CR) { - chanPtr->flags &= ~INPUT_SAW_CR; - *dst = '\r'; - dst++; - } - if (curByte == '\r') { - chanPtr->flags |= INPUT_SAW_CR; - } else { - *dst = (char) curByte; - dst++; - } + if (curByte == '\r') { + SetFlag(statePtr, INPUT_SAW_CR); + } else { + *dst = (char) curByte; + dst++; } - copied = dst - result; - break; } - case TCL_TRANSLATE_AUTO: { - char *src, *end, *dst; - int curByte; - - if (bytesInBuffer == 0) { - return 0; - } + copied = dst - result; + break; + } + case TCL_TRANSLATE_AUTO: { + char *src, *end, *dst; + int curByte; - /* - * Loop over the current buffer, converting "\r" and "\r\n" - * to "\n". - */ + if (bytesInBuffer == 0) { + return 0; + } - if (bytesInBuffer < space) { - space = bytesInBuffer; - } - memcpy((VOID *) result, - (VOID *) (bufPtr->buf + bufPtr->nextRemoved), - (size_t) space); - bufPtr->nextRemoved += space; - copied = space; - - end = result + copied; - dst = result; - for (src = result; src < end; src++) { - curByte = *src; - if (curByte == '\r') { - chanPtr->flags |= INPUT_SAW_CR; - *dst = '\n'; + /* + * Loop over the current buffer, converting "\r" and "\r\n" to "\n". + */ + + if (bytesInBuffer < space) { + space = bytesInBuffer; + } + memcpy(result, RemovePoint(bufPtr), (size_t) space); + bufPtr->nextRemoved += space; + copied = space; + + end = result + copied; + dst = result; + for (src = result; src < end; src++) { + curByte = *src; + if (curByte == '\r') { + SetFlag(statePtr, INPUT_SAW_CR); + *dst = '\n'; + dst++; + } else { + if ((curByte != '\n') || !GotFlag(statePtr, INPUT_SAW_CR)) { + *dst = (char) curByte; dst++; - } else { - if ((curByte != '\n') || - !(chanPtr->flags & INPUT_SAW_CR)) { - *dst = (char) curByte; - dst++; - } - chanPtr->flags &= ~INPUT_SAW_CR; } + ResetFlag(statePtr, INPUT_SAW_CR); } - copied = dst - result; - break; - } - default: { - panic("unknown eol translation mode"); } + copied = dst - result; + break; + } + default: + Tcl_Panic("unknown eol translation mode"); } /* - * If an in-stream EOF character is set for this channel, check that - * the input we copied so far does not contain the EOF char. If it does, - * copy only up to and excluding that character. + * If an in-stream EOF character is set for this channel, check that the + * input we copied so far does not contain the EOF char. If it does, copy + * only up to and excluding that character. */ - - if (chanPtr->inEofChar != 0) { - for (i = 0; i < copied; i++) { - if (result[i] == (char) chanPtr->inEofChar) { + + if (statePtr->inEofChar != 0) { + for (i = 0; i < copied; i++) { + if (result[i] == (char) statePtr->inEofChar) { /* - * Set sticky EOF so that no further input is presented - * to the caller. + * Set sticky EOF so that no further input is presented to the + * caller. */ - - chanPtr->flags |= (CHANNEL_EOF | CHANNEL_STICKY_EOF); - chanPtr->inputEncodingFlags |= TCL_ENCODING_END; + + SetFlag(statePtr, CHANNEL_EOF | CHANNEL_STICKY_EOF); + statePtr->inputEncodingFlags |= TCL_ENCODING_END; copied = i; - break; - } - } + break; + } + } } /* * If the current buffer is empty recycle it. */ - if (bufPtr->nextRemoved == bufPtr->nextAdded) { - chanPtr->inQueueHead = bufPtr->nextPtr; - if (chanPtr->inQueueHead == (ChannelBuffer *) NULL) { - chanPtr->inQueueTail = (ChannelBuffer *) NULL; - } - RecycleBuffer(chanPtr, bufPtr, 0); + if (IsBufferEmpty(bufPtr)) { + statePtr->inQueueHead = bufPtr->nextPtr; + if (statePtr->inQueueHead == NULL) { + statePtr->inQueueTail = NULL; + } + RecycleBuffer(statePtr, bufPtr, 0); } /* - * Return the number of characters copied into the result buffer. - * This may be different from the number of bytes consumed, because - * of EOL translations. + * Return the number of characters copied into the result buffer. This may + * be different from the number of bytes consumed, because of EOL + * translations. */ return copied; @@ -7906,158 +9586,91 @@ CopyAndTranslateBuffer(chanPtr, result, space) /* *---------------------------------------------------------------------- * - * DoWrite -- + * CopyBuffer -- * - * Puts a sequence of characters into an output buffer, may queue the - * buffer for output if it gets full, and also remembers whether the - * current buffer is ready e.g. if it contains a newline and we are in - * line buffering mode. + * Copy at most one buffer of input to the result space. * * Results: - * The number of bytes written or -1 in case of error. If -1, - * Tcl_GetErrno will return the error code. + * Number of bytes stored in the result buffer. May return zero if no + * input is available. * * Side effects: - * May buffer up output and may cause output to be produced on the - * channel. + * Consumes buffered input. May deallocate one buffer. * *---------------------------------------------------------------------- */ static int -DoWrite(chanPtr, src, srcLen) - Channel *chanPtr; /* The channel to buffer output for. */ - char *src; /* Data to write. */ - int srcLen; /* Number of bytes to write. */ +CopyBuffer( + Channel *chanPtr, /* Channel from which to read input. */ + char *result, /* Where to store the copied input. */ + int space) /* How many bytes are available in result to + * store the copied input? */ { - ChannelBuffer *outBufPtr; /* Current output buffer. */ - int foundNewline; /* Did we find a newline in output? */ - char *dPtr; - char *sPtr; /* Search variables for newline. */ - int crsent; /* In CRLF eol translation mode, - * remember the fact that a CR was - * output to the channel without - * its following NL. */ - int i; /* Loop index for newline search. */ - int destCopied; /* How many bytes were used in this - * destination buffer to hold the - * output? */ - int totalDestCopied; /* How many bytes total were - * copied to the channel buffer? */ - int srcCopied; /* How many bytes were copied from - * the source string? */ - char *destPtr; /* Where in line to copy to? */ + ChannelBuffer *bufPtr; /* The buffer from which to copy bytes. */ + int bytesInBuffer; /* How many bytes are available to be copied + * in the current input buffer? */ + int copied; /* How many characters were already copied + * into the destination space? */ /* - * If we are in network (or windows) translation mode, record the fact - * that we have not yet sent a CR to the channel. + * If there is no input at all, return zero. The invariant is that either + * there is no buffer in the queue, or if the first buffer is empty, it is + * also the last buffer (and thus there is no input in the queue). Note + * also that if the buffer is empty, we don't leave it in the queue, but + * recycle it. */ - crsent = 0; - - /* - * Loop filling buffers and flushing them until all output has been - * consumed. - */ + if (chanPtr->inQueueHead == NULL) { + return 0; + } + bufPtr = chanPtr->inQueueHead; + bytesInBuffer = BytesLeft(bufPtr); - srcCopied = 0; - totalDestCopied = 0; + copied = 0; - while (srcLen > 0) { - - /* - * Make sure there is a current output buffer to accept output. - */ + if (bytesInBuffer == 0) { + RecycleBuffer(chanPtr->state, bufPtr, 0); + chanPtr->inQueueHead = NULL; + chanPtr->inQueueTail = NULL; + return 0; + } - if (chanPtr->curOutPtr == (ChannelBuffer *) NULL) { - chanPtr->curOutPtr = AllocChannelBuffer(chanPtr->bufSize); - } + /* + * Copy the current chunk into the result buffer. + */ - outBufPtr = chanPtr->curOutPtr; + if (bytesInBuffer < space) { + space = bytesInBuffer; + } - destCopied = outBufPtr->bufLength - outBufPtr->nextAdded; - if (destCopied > srcLen) { - destCopied = srcLen; - } - - destPtr = outBufPtr->buf + outBufPtr->nextAdded; - switch (chanPtr->outputTranslation) { - case TCL_TRANSLATE_LF: - srcCopied = destCopied; - memcpy((VOID *) destPtr, (VOID *) src, (size_t) destCopied); - break; - case TCL_TRANSLATE_CR: - srcCopied = destCopied; - memcpy((VOID *) destPtr, (VOID *) src, (size_t) destCopied); - for (dPtr = destPtr; dPtr < destPtr + destCopied; dPtr++) { - if (*dPtr == '\n') { - *dPtr = '\r'; - } - } - break; - case TCL_TRANSLATE_CRLF: - for (srcCopied = 0, dPtr = destPtr, sPtr = src; - dPtr < destPtr + destCopied; - dPtr++, sPtr++, srcCopied++) { - if (*sPtr == '\n') { - if (crsent) { - *dPtr = '\n'; - crsent = 0; - } else { - *dPtr = '\r'; - crsent = 1; - sPtr--, srcCopied--; - } - } else { - *dPtr = *sPtr; - } - } - break; - case TCL_TRANSLATE_AUTO: - panic("Tcl_Write: AUTO output translation mode not supported"); - default: - panic("Tcl_Write: unknown output translation mode"); - } + memcpy(result, RemovePoint(bufPtr), (size_t) space); + bufPtr->nextRemoved += space; + copied = space; - /* - * The current buffer is ready for output if it is full, or if it - * contains a newline and this channel is line-buffered, or if it - * contains any output and this channel is unbuffered. - */ + /* + * We don't care about in-stream EOF characters here as the data read here + * may still flow through one or more transformations, i.e. is not in its + * final state yet. + */ - outBufPtr->nextAdded += destCopied; - if (!(chanPtr->flags & BUFFER_READY)) { - if (outBufPtr->nextAdded == outBufPtr->bufLength) { - chanPtr->flags |= BUFFER_READY; - } else if (chanPtr->flags & CHANNEL_LINEBUFFERED) { - for (sPtr = src, i = 0, foundNewline = 0; - (i < srcCopied) && (!foundNewline); - i++, sPtr++) { - if (*sPtr == '\n') { - foundNewline = 1; - break; - } - } - if (foundNewline) { - chanPtr->flags |= BUFFER_READY; - } - } else if (chanPtr->flags & CHANNEL_UNBUFFERED) { - chanPtr->flags |= BUFFER_READY; - } - } - - totalDestCopied += srcCopied; - src += srcCopied; - srcLen -= srcCopied; + /* + * If the current buffer is empty recycle it. + */ - if (chanPtr->flags & BUFFER_READY) { - if (FlushChannel(NULL, chanPtr, 0) != 0) { - return -1; - } - } - } /* Closes "while" */ + if (IsBufferEmpty(bufPtr)) { + chanPtr->inQueueHead = bufPtr->nextPtr; + if (chanPtr->inQueueHead == NULL) { + chanPtr->inQueueTail = NULL; + } + RecycleBuffer(chanPtr->state, bufPtr, 0); + } + + /* + * Return the number of characters copied into the result buffer. + */ - return totalDestCopied; + return copied; } /* @@ -8065,9 +9678,9 @@ DoWrite(chanPtr, src, srcLen) * * CopyEventProc -- * - * This routine is invoked as a channel event handler for - * the background copy operation. It is just a trivial wrapper - * around the CopyData routine. + * This routine is invoked as a channel event handler for the background + * copy operation. It is just a trivial wrapper around the CopyData + * routine. * * Results: * None. @@ -8079,11 +9692,11 @@ DoWrite(chanPtr, src, srcLen) */ static void -CopyEventProc(clientData, mask) - ClientData clientData; - int mask; +CopyEventProc( + ClientData clientData, + int mask) { - (void) CopyData((CopyState *)clientData, mask); + (void) CopyData(clientData, mask); } /* @@ -8097,54 +9710,107 @@ CopyEventProc(clientData, mask) * None. * * Side effects: - * Removes any pending channel handlers and restores the blocking - * and buffering modes of the channels. The CopyState is freed. + * Removes any pending channel handlers and restores the blocking and + * buffering modes of the channels. The CopyState is freed. * *---------------------------------------------------------------------- */ static void -StopCopy(csPtr) - CopyState *csPtr; /* State for bg copy to stop . */ +StopCopy( + CopyState *csPtr) /* State for bg copy to stop . */ { + ChannelState *inStatePtr, *outStatePtr; int nonBlocking; if (!csPtr) { return; } + inStatePtr = csPtr->readPtr->state; + outStatePtr = csPtr->writePtr->state; + /* * Restore the old blocking mode and output buffering mode. */ - nonBlocking = (csPtr->readFlags & CHANNEL_NONBLOCKING); - if (nonBlocking != (csPtr->readPtr->flags & CHANNEL_NONBLOCKING)) { + nonBlocking = csPtr->readFlags & CHANNEL_NONBLOCKING; + if (nonBlocking != (inStatePtr->flags & CHANNEL_NONBLOCKING)) { SetBlockMode(NULL, csPtr->readPtr, nonBlocking ? TCL_MODE_NONBLOCKING : TCL_MODE_BLOCKING); } - if (csPtr->writePtr != csPtr->writePtr) { - if (nonBlocking != (csPtr->writePtr->flags & CHANNEL_NONBLOCKING)) { + if (csPtr->readPtr != csPtr->writePtr) { + nonBlocking = csPtr->writeFlags & CHANNEL_NONBLOCKING; + if (nonBlocking != (outStatePtr->flags & CHANNEL_NONBLOCKING)) { SetBlockMode(NULL, csPtr->writePtr, nonBlocking ? TCL_MODE_NONBLOCKING : TCL_MODE_BLOCKING); } } - csPtr->writePtr->flags &= ~(CHANNEL_LINEBUFFERED | CHANNEL_UNBUFFERED); - csPtr->writePtr->flags |= - csPtr->writeFlags & (CHANNEL_LINEBUFFERED | CHANNEL_UNBUFFERED); - + ResetFlag(outStatePtr, CHANNEL_LINEBUFFERED | CHANNEL_UNBUFFERED); + outStatePtr->flags |= + csPtr->writeFlags & (CHANNEL_LINEBUFFERED | CHANNEL_UNBUFFERED); if (csPtr->cmdPtr) { - Tcl_DeleteChannelHandler((Tcl_Channel)csPtr->readPtr, CopyEventProc, - (ClientData)csPtr); + Tcl_DeleteChannelHandler((Tcl_Channel) csPtr->readPtr, CopyEventProc, + csPtr); if (csPtr->readPtr != csPtr->writePtr) { - Tcl_DeleteChannelHandler((Tcl_Channel)csPtr->writePtr, - CopyEventProc, (ClientData)csPtr); + Tcl_DeleteChannelHandler((Tcl_Channel) csPtr->writePtr, + CopyEventProc, csPtr); } - Tcl_DecrRefCount(csPtr->cmdPtr); + TclDecrRefCount(csPtr->cmdPtr); } - csPtr->readPtr->csPtr = NULL; - csPtr->writePtr->csPtr = NULL; - ckfree((char*) csPtr); + inStatePtr->csPtrR = NULL; + outStatePtr->csPtrW = NULL; + ckfree(csPtr); +} + +/* + *---------------------------------------------------------------------- + * + * StackSetBlockMode -- + * + * This function sets the blocking mode for a channel, iterating through + * each channel in a stack and updates the state flags. + * + * Results: + * 0 if OK, result code from failed blockModeProc otherwise. + * + * Side effects: + * Modifies the blocking mode of the channel and possibly generates an + * error. + * + *---------------------------------------------------------------------- + */ + +static int +StackSetBlockMode( + Channel *chanPtr, /* Channel to modify. */ + int mode) /* One of TCL_MODE_BLOCKING or + * TCL_MODE_NONBLOCKING. */ +{ + int result = 0; + Tcl_DriverBlockModeProc *blockModeProc; + ChannelState *statePtr = chanPtr->state; + + /* + * Start at the top of the channel stack + * TODO: Examine what can go wrong when blockModeProc calls + * disturb the stacking state of the channel. + */ + + chanPtr = statePtr->topChanPtr; + while (chanPtr != NULL) { + blockModeProc = Tcl_ChannelBlockModeProc(chanPtr->typePtr); + if (blockModeProc != NULL) { + result = blockModeProc(chanPtr->instanceData, mode); + if (result != 0) { + Tcl_SetErrno(result); + return result; + } + } + chanPtr = chanPtr->downChanPtr; + } + return 0; } /* @@ -8152,43 +9818,65 @@ StopCopy(csPtr) * * SetBlockMode -- * - * This function sets the blocking mode for a channel and updates - * the state flags. + * This function sets the blocking mode for a channel and updates the + * state flags. * * Results: * A standard Tcl result. * * Side effects: - * Modifies the blocking mode of the channel and possibly generates - * an error. + * Modifies the blocking mode of the channel and possibly generates an + * error. * *---------------------------------------------------------------------- */ static int -SetBlockMode(interp, chanPtr, mode) - Tcl_Interp *interp; /* Interp for error reporting. */ - Channel *chanPtr; /* Channel to modify. */ - int mode; /* One of TCL_MODE_BLOCKING or +SetBlockMode( + Tcl_Interp *interp, /* Interp for error reporting. */ + Channel *chanPtr, /* Channel to modify. */ + int mode) /* One of TCL_MODE_BLOCKING or * TCL_MODE_NONBLOCKING. */ { int result = 0; - if (chanPtr->typePtr->blockModeProc != NULL) { - result = (chanPtr->typePtr->blockModeProc) (chanPtr->instanceData, - mode); - } + ChannelState *statePtr = chanPtr->state; + /* State info for channel */ + + result = StackSetBlockMode(chanPtr, mode); if (result != 0) { - Tcl_SetErrno(result); - if (interp != (Tcl_Interp *) NULL) { - Tcl_AppendResult(interp, "error setting blocking mode: ", - Tcl_PosixError(interp), (char *) NULL); + if (interp != NULL) { + /* + * TIP #219. + * Move error messages put by the driver into the bypass area and + * put them into the regular interpreter result. Fall back to the + * regular message if nothing was found in the bypass. + * + * Note that we cannot have a message in the interpreter bypass + * area, StackSetBlockMode is restricted to the channel bypass. + * We still need the interp as the destination of the move. + */ + + if (!TclChanCaughtErrorBypass(interp, (Tcl_Channel) chanPtr)) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "error setting blocking mode: %s", + Tcl_PosixError(interp))); + } + } else { + /* + * TIP #219. + * If we have no interpreter to put a bypass message into we have + * to clear it, to prevent its propagation and use in other places + * unrelated to the actual occurence of the problem. + */ + + Tcl_SetChannelError((Tcl_Channel) chanPtr, NULL); } return TCL_ERROR; } if (mode == TCL_MODE_BLOCKING) { - chanPtr->flags &= (~(CHANNEL_NONBLOCKING | BG_FLUSH_SCHEDULED)); + ResetFlag(statePtr, CHANNEL_NONBLOCKING | BG_FLUSH_SCHEDULED); } else { - chanPtr->flags |= CHANNEL_NONBLOCKING; + SetFlag(statePtr, CHANNEL_NONBLOCKING); } return TCL_OK; } @@ -8210,10 +9898,10 @@ SetBlockMode(interp, chanPtr, mode) */ int -Tcl_GetChannelNames(interp) - Tcl_Interp *interp; /* Interp for error reporting. */ +Tcl_GetChannelNames( + Tcl_Interp *interp) /* Interp for error reporting. */ { - return Tcl_GetChannelNamesEx(interp, (char *) NULL); + return Tcl_GetChannelNamesEx(interp, NULL); } /* @@ -8221,9 +9909,9 @@ Tcl_GetChannelNames(interp) * * Tcl_GetChannelNamesEx -- * - * Return the names of open channels in the interp filtered - * filtered through a pattern. If pattern is NULL, it returns - * all the open channels. + * Return the names of open channels in the interp filtered filtered + * through a pattern. If pattern is NULL, it returns all the open + * channels. * * Results: * TCL_OK or TCL_ERROR. @@ -8235,33 +9923,1125 @@ Tcl_GetChannelNames(interp) */ int -Tcl_GetChannelNamesEx(interp, pattern) - Tcl_Interp *interp; /* Interp for error reporting. */ - char *pattern; /* pattern to filter on. */ +Tcl_GetChannelNamesEx( + Tcl_Interp *interp, /* Interp for error reporting. */ + const char *pattern) /* Pattern to filter on. */ { - Channel *chanPtr; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - char *name; - Tcl_Obj *resultPtr; - - resultPtr = Tcl_GetObjResult(interp); - for (chanPtr = tsdPtr->firstChanPtr; - chanPtr != NULL; - chanPtr = chanPtr->nextChanPtr) { - if (chanPtr == (Channel *) tsdPtr->stdinChannel) { + ChannelState *statePtr; + const char *name; /* Name for channel */ + Tcl_Obj *resultPtr; /* Pointer to result object */ + Tcl_HashTable *hTblPtr; /* Hash table of channels. */ + Tcl_HashEntry *hPtr; /* Search variable. */ + Tcl_HashSearch hSearch; /* Search variable. */ + + if (interp == NULL) { + return TCL_OK; + } + + /* + * Get the channel table that stores the channels registered for this + * interpreter. + */ + + hTblPtr = GetChannelTable(interp); + TclNewObj(resultPtr); + if ((pattern != NULL) && TclMatchIsTrivial(pattern) + && !((pattern[0] == 's') && (pattern[1] == 't') + && (pattern[2] == 'd'))) { + if ((Tcl_FindHashEntry(hTblPtr, pattern) != NULL) + && (Tcl_ListObjAppendElement(interp, resultPtr, + Tcl_NewStringObj(pattern, -1)) != TCL_OK)) { + goto error; + } + goto done; + } + + for (hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch); hPtr != NULL; + hPtr = Tcl_NextHashEntry(&hSearch)) { + statePtr = ((Channel *) Tcl_GetHashValue(hPtr))->state; + + if (statePtr->topChanPtr == (Channel *) tsdPtr->stdinChannel) { name = "stdin"; - } else if (chanPtr == (Channel *) tsdPtr->stdoutChannel) { + } else if (statePtr->topChanPtr == (Channel *) tsdPtr->stdoutChannel) { name = "stdout"; - } else if (chanPtr == (Channel *) tsdPtr->stderrChannel) { + } else if (statePtr->topChanPtr == (Channel *) tsdPtr->stderrChannel) { name = "stderr"; } else { - name = chanPtr->channelName; + /* + * This is also stored in Tcl_GetHashKey(hTblPtr, hPtr), but it's + * simpler to just grab the name from the statePtr. + */ + + name = statePtr->channelName; } + if (((pattern == NULL) || Tcl_StringMatch(name, pattern)) && (Tcl_ListObjAppendElement(interp, resultPtr, Tcl_NewStringObj(name, -1)) != TCL_OK)) { + error: + TclDecrRefCount(resultPtr); + return TCL_ERROR; + } + } + + done: + Tcl_SetObjResult(interp, resultPtr); + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_IsChannelRegistered -- + * + * Checks whether the channel is associated with the interp. See also + * Tcl_RegisterChannel and Tcl_UnregisterChannel. + * + * Results: + * 0 if the channel is not registered in the interpreter, 1 else. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_IsChannelRegistered( + Tcl_Interp *interp, /* The interp to query of the channel */ + Tcl_Channel chan) /* The channel to check */ +{ + Tcl_HashTable *hTblPtr; /* Hash table of channels. */ + Tcl_HashEntry *hPtr; /* Search variable. */ + Channel *chanPtr; /* The real IO channel. */ + ChannelState *statePtr; /* State of the real channel. */ + + /* + * Always check bottom-most channel in the stack. This is the one that + * gets registered. + */ + + chanPtr = ((Channel *) chan)->state->bottomChanPtr; + statePtr = chanPtr->state; + + hTblPtr = Tcl_GetAssocData(interp, "tclIO", NULL); + if (hTblPtr == NULL) { + return 0; + } + hPtr = Tcl_FindHashEntry(hTblPtr, statePtr->channelName); + if (hPtr == NULL) { + return 0; + } + if ((Channel *) Tcl_GetHashValue(hPtr) != chanPtr) { + return 0; + } + + return 1; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_IsChannelShared -- + * + * Checks whether the channel is shared by multiple interpreters. + * + * Results: + * A boolean value (0 = Not shared, 1 = Shared). + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_IsChannelShared( + Tcl_Channel chan) /* The channel to query */ +{ + ChannelState *statePtr = ((Channel *) chan)->state; + /* State of real channel structure. */ + + return ((statePtr->refCount > 1) ? 1 : 0); +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_IsChannelExisting -- + * + * Checks whether a channel of the given name exists in the + * (thread)-global list of all channels. See Tcl_GetChannelNamesEx for + * function exposed at the Tcl level. + * + * Results: + * A boolean value (0 = Does not exist, 1 = Does exist). + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_IsChannelExisting( + const char *chanName) /* The name of the channel to look for. */ +{ + ChannelState *statePtr; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + const char *name; + int chanNameLen; + + chanNameLen = strlen(chanName); + for (statePtr = tsdPtr->firstCSPtr; statePtr != NULL; + statePtr = statePtr->nextCSPtr) { + if (statePtr->topChanPtr == (Channel *) tsdPtr->stdinChannel) { + name = "stdin"; + } else if (statePtr->topChanPtr == (Channel *) tsdPtr->stdoutChannel) { + name = "stdout"; + } else if (statePtr->topChanPtr == (Channel *) tsdPtr->stderrChannel) { + name = "stderr"; + } else { + name = statePtr->channelName; + } + + if ((*chanName == *name) && + (memcmp(name, chanName, (size_t) chanNameLen + 1) == 0)) { + return 1; + } + } + + return 0; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelName -- + * + * Return the name of the channel type. + * + * Results: + * A pointer the name of the channel type. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +const char * +Tcl_ChannelName( + const Tcl_ChannelType *chanTypePtr) /* Pointer to channel type. */ +{ + return chanTypePtr->typeName; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelVersion -- + * + * Return the of version of the channel type. + * + * Results: + * One of the TCL_CHANNEL_VERSION_* constants from tcl.h + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_ChannelTypeVersion +Tcl_ChannelVersion( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + if (chanTypePtr->version == TCL_CHANNEL_VERSION_2) { + return TCL_CHANNEL_VERSION_2; + } else if (chanTypePtr->version == TCL_CHANNEL_VERSION_3) { + return TCL_CHANNEL_VERSION_3; + } else if (chanTypePtr->version == TCL_CHANNEL_VERSION_4) { + return TCL_CHANNEL_VERSION_4; + } else if (chanTypePtr->version == TCL_CHANNEL_VERSION_5) { + return TCL_CHANNEL_VERSION_5; + } else { + /* + * In <v2 channel versions, the version field is occupied by the + * Tcl_DriverBlockModeProc + */ + + return TCL_CHANNEL_VERSION_1; + } +} + +/* + *---------------------------------------------------------------------- + * + * HaveVersion -- + * + * Return whether a channel type is (at least) of a given version. + * + * Results: + * True if the minimum version is exceeded by the version actually + * present. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +HaveVersion( + const Tcl_ChannelType *chanTypePtr, + Tcl_ChannelTypeVersion minimumVersion) +{ + Tcl_ChannelTypeVersion actualVersion = Tcl_ChannelVersion(chanTypePtr); + + return (PTR2INT(actualVersion)) >= (PTR2INT(minimumVersion)); +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelBlockModeProc -- + * + * Return the Tcl_DriverBlockModeProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- */ + +Tcl_DriverBlockModeProc * +Tcl_ChannelBlockModeProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + if (HaveVersion(chanTypePtr, TCL_CHANNEL_VERSION_2)) { + return chanTypePtr->blockModeProc; + } + + /* + * The v1 structure had the blockModeProc in a different place. + */ + + return (Tcl_DriverBlockModeProc *) chanTypePtr->version; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelCloseProc -- + * + * Return the Tcl_DriverCloseProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverCloseProc * +Tcl_ChannelCloseProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + return chanTypePtr->closeProc; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelClose2Proc -- + * + * Return the Tcl_DriverClose2Proc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverClose2Proc * +Tcl_ChannelClose2Proc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + return chanTypePtr->close2Proc; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelInputProc -- + * + * Return the Tcl_DriverInputProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverInputProc * +Tcl_ChannelInputProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + return chanTypePtr->inputProc; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelOutputProc -- + * + * Return the Tcl_DriverOutputProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverOutputProc * +Tcl_ChannelOutputProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + return chanTypePtr->outputProc; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelSeekProc -- + * + * Return the Tcl_DriverSeekProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverSeekProc * +Tcl_ChannelSeekProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + return chanTypePtr->seekProc; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelSetOptionProc -- + * + * Return the Tcl_DriverSetOptionProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverSetOptionProc * +Tcl_ChannelSetOptionProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + return chanTypePtr->setOptionProc; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelGetOptionProc -- + * + * Return the Tcl_DriverGetOptionProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverGetOptionProc * +Tcl_ChannelGetOptionProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + return chanTypePtr->getOptionProc; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelWatchProc -- + * + * Return the Tcl_DriverWatchProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverWatchProc * +Tcl_ChannelWatchProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + return chanTypePtr->watchProc; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelGetHandleProc -- + * + * Return the Tcl_DriverGetHandleProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverGetHandleProc * +Tcl_ChannelGetHandleProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + return chanTypePtr->getHandleProc; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelFlushProc -- + * + * Return the Tcl_DriverFlushProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverFlushProc * +Tcl_ChannelFlushProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + if (HaveVersion(chanTypePtr, TCL_CHANNEL_VERSION_2)) { + return chanTypePtr->flushProc; + } + return NULL; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelHandlerProc -- + * + * Return the Tcl_DriverHandlerProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverHandlerProc * +Tcl_ChannelHandlerProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + if (HaveVersion(chanTypePtr, TCL_CHANNEL_VERSION_2)) { + return chanTypePtr->handlerProc; + } + return NULL; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelWideSeekProc -- + * + * Return the Tcl_DriverWideSeekProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverWideSeekProc * +Tcl_ChannelWideSeekProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + if (HaveVersion(chanTypePtr, TCL_CHANNEL_VERSION_3)) { + return chanTypePtr->wideSeekProc; + } + return NULL; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelThreadActionProc -- + * + * TIP #218, Channel Thread Actions. Return the + * Tcl_DriverThreadActionProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverThreadActionProc * +Tcl_ChannelThreadActionProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + if (HaveVersion(chanTypePtr, TCL_CHANNEL_VERSION_4)) { + return chanTypePtr->threadActionProc; + } + return NULL; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_SetChannelErrorInterp -- + * + * TIP #219, Tcl Channel Reflection API. + * Store an error message for the I/O system. + * + * Results: + * None. + * + * Side effects: + * Discards a previously stored message. + * + *---------------------------------------------------------------------- + */ + +void +Tcl_SetChannelErrorInterp( + Tcl_Interp *interp, /* Interp to store the data into. */ + Tcl_Obj *msg) /* Error message to store. */ +{ + Interp *iPtr = (Interp *) interp; + + if (iPtr->chanMsg != NULL) { + TclDecrRefCount(iPtr->chanMsg); + iPtr->chanMsg = NULL; + } + + if (msg != NULL) { + iPtr->chanMsg = FixLevelCode(msg); + Tcl_IncrRefCount(iPtr->chanMsg); + } + return; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_SetChannelError -- + * + * TIP #219, Tcl Channel Reflection API. + * Store an error message for the I/O system. + * + * Results: + * None. + * + * Side effects: + * Discards a previously stored message. + * + *---------------------------------------------------------------------- + */ + +void +Tcl_SetChannelError( + Tcl_Channel chan, /* Channel to store the data into. */ + Tcl_Obj *msg) /* Error message to store. */ +{ + ChannelState *statePtr = ((Channel *) chan)->state; + + if (statePtr->chanMsg != NULL) { + TclDecrRefCount(statePtr->chanMsg); + statePtr->chanMsg = NULL; + } + + if (msg != NULL) { + statePtr->chanMsg = FixLevelCode(msg); + Tcl_IncrRefCount(statePtr->chanMsg); + } + return; +} + +/* + *---------------------------------------------------------------------- + * + * FixLevelCode -- + * + * TIP #219, Tcl Channel Reflection API. + * Scans an error message for bad -code / -level directives. Returns a + * modified copy with such directives corrected, and the input if it had + * no problems. + * + * Results: + * A Tcl_Obj* + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static Tcl_Obj * +FixLevelCode( + Tcl_Obj *msg) +{ + int explicitResult, numOptions, lc, lcn; + Tcl_Obj **lv, **lvn; + int res, i, j, val, lignore, cignore; + int newlevel = -1, newcode = -1; + + /* ASSERT msg != NULL */ + + /* + * Process the caught message. + * + * Syntax = (option value)... ?message? + * + * Bad message syntax causes a panic, because the other side uses + * Tcl_GetReturnOptions and list construction functions to marshall the + * information. Hence an error means that we've got serious breakage. + */ + + res = Tcl_ListObjGetElements(NULL, msg, &lc, &lv); + if (res != TCL_OK) { + Tcl_Panic("Tcl_SetChannelError: bad syntax of message"); + } + + explicitResult = (1 == (lc % 2)); + numOptions = lc - explicitResult; + + /* + * No options, nothing to do. + */ + + if (numOptions == 0) { + return msg; + } + + /* + * Check for -code x, x != 1|error, and -level x, x != 0 + */ + + for (i = 0; i < numOptions; i += 2) { + if (0 == strcmp(TclGetString(lv[i]), "-code")) { + /* + * !"error", !integer, integer != 1 (numeric code for error) + */ + + res = TclGetIntFromObj(NULL, lv[i+1], &val); + if (((res == TCL_OK) && (val != 1)) || ((res != TCL_OK) && + (0 != strcmp(TclGetString(lv[i+1]), "error")))) { + newcode = 1; + } + } else if (0 == strcmp(TclGetString(lv[i]), "-level")) { + /* + * !integer, integer != 0 + */ + + res = TclGetIntFromObj(NULL, lv [i+1], &val); + if ((res != TCL_OK) || (val != 0)) { + newlevel = 0; + } + } + } + + /* + * -code, -level are either not present or ok. Nothing to do. + */ + + if ((newlevel < 0) && (newcode < 0)) { + return msg; + } + + lcn = numOptions; + if (explicitResult) { + lcn ++; + } + if (newlevel >= 0) { + lcn += 2; + } + if (newcode >= 0) { + lcn += 2; + } + + lvn = ckalloc(lcn * sizeof(Tcl_Obj *)); + + /* + * New level/code information is spliced into the first occurence of + * -level, -code, further occurences are ignored. The options cannot be + * not present, we would not come here. Options which are ok are simply + * copied over. + */ + + lignore = cignore = 0; + for (i=0, j=0; i<numOptions; i+=2) { + if (0 == strcmp(TclGetString(lv[i]), "-level")) { + if (newlevel >= 0) { + lvn[j++] = lv[i]; + lvn[j++] = Tcl_NewIntObj(newlevel); + newlevel = -1; + lignore = 1; + continue; + } else if (lignore) { + continue; + } + } else if (0 == strcmp(TclGetString(lv[i]), "-code")) { + if (newcode >= 0) { + lvn[j++] = lv[i]; + lvn[j++] = Tcl_NewIntObj(newcode); + newcode = -1; + cignore = 1; + continue; + } else if (cignore) { + continue; + } + } + + /* + * Keep everything else, possibly copied down. + */ + + lvn[j++] = lv[i]; + lvn[j++] = lv[i+1]; + } + if (newlevel >= 0) { + Tcl_Panic("Defined newlevel not used in rewrite"); + } + if (newcode >= 0) { + Tcl_Panic("Defined newcode not used in rewrite"); + } + + if (explicitResult) { + lvn[j++] = lv[i]; + } + + msg = Tcl_NewListObj(j, lvn); + + ckfree(lvn); + return msg; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetChannelErrorInterp -- + * + * TIP #219, Tcl Channel Reflection API. + * Return the message stored by the channel driver. + * + * Results: + * Tcl error message object. + * + * Side effects: + * Resets the stored data to NULL. + * + *---------------------------------------------------------------------- + */ + +void +Tcl_GetChannelErrorInterp( + Tcl_Interp *interp, /* Interp to query. */ + Tcl_Obj **msg) /* Place for error message. */ +{ + Interp *iPtr = (Interp *) interp; + + *msg = iPtr->chanMsg; + iPtr->chanMsg = NULL; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetChannelError -- + * + * TIP #219, Tcl Channel Reflection API. + * Return the message stored by the channel driver. + * + * Results: + * Tcl error message object. + * + * Side effects: + * Resets the stored data to NULL. + * + *---------------------------------------------------------------------- + */ + +void +Tcl_GetChannelError( + Tcl_Channel chan, /* Channel to query. */ + Tcl_Obj **msg) /* Place for error message. */ +{ + ChannelState *statePtr = ((Channel *) chan)->state; + + *msg = statePtr->chanMsg; + statePtr->chanMsg = NULL; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_ChannelTruncateProc -- + * + * TIP #208 (subsection relating to truncation, based on TIP #206). + * Return the Tcl_DriverTruncateProc of the channel type. + * + * Results: + * A pointer to the proc. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_DriverTruncateProc * +Tcl_ChannelTruncateProc( + const Tcl_ChannelType *chanTypePtr) + /* Pointer to channel type. */ +{ + if (HaveVersion(chanTypePtr, TCL_CHANNEL_VERSION_5)) { + return chanTypePtr->truncateProc; + } + return NULL; +} + +/* + *---------------------------------------------------------------------- + * + * DupChannelIntRep -- + * + * Initialize the internal representation of a new Tcl_Obj to a copy of + * the internal representation of an existing string object. + * + * Results: + * None. + * + * Side effects: + * copyPtr's internal rep is set to a copy of srcPtr's internal + * representation. + * + *---------------------------------------------------------------------- + */ + +static void +DupChannelIntRep( + register Tcl_Obj *srcPtr, /* Object with internal rep to copy. Must have + * an internal rep of type "Channel". */ + register Tcl_Obj *copyPtr) /* Object with internal rep to set. Must not + * currently have an internal rep.*/ +{ + ChannelState *statePtr = GET_CHANNELSTATE(srcPtr); + + SET_CHANNELSTATE(copyPtr, statePtr); + SET_CHANNELINTERP(copyPtr, GET_CHANNELINTERP(srcPtr)); + Tcl_Preserve(statePtr); + copyPtr->typePtr = srcPtr->typePtr; +} + +/* + *---------------------------------------------------------------------- + * + * SetChannelFromAny -- + * + * Create an internal representation of type "Channel" for an object. + * + * Results: + * This operation always succeeds and returns TCL_OK. + * + * Side effects: + * Any old internal reputation for objPtr is freed and the internal + * representation is set to "Channel". + * + *---------------------------------------------------------------------- + */ + +static int +SetChannelFromAny( + Tcl_Interp *interp, /* Used for error reporting if not NULL. */ + register Tcl_Obj *objPtr) /* The object to convert. */ +{ + ChannelState *statePtr; + + if (interp == NULL) { + return TCL_ERROR; + } + if (objPtr->typePtr == &chanObjType) { + /* + * The channel is valid until any call to DetachChannel occurs. + * Ensure consistency checks are done. + */ + + statePtr = GET_CHANNELSTATE(objPtr); + if (GotFlag(statePtr, CHANNEL_TAINTED|CHANNEL_CLOSED)) { + ResetFlag(statePtr, CHANNEL_TAINTED); + Tcl_Release(statePtr); + objPtr->typePtr = NULL; + } else if (interp != GET_CHANNELINTERP(objPtr)) { + Tcl_Release(statePtr); + objPtr->typePtr = NULL; + } + } + if (objPtr->typePtr != &chanObjType) { + Tcl_Channel chan = Tcl_GetChannel(interp, TclGetString(objPtr), NULL); + + if (chan == NULL) { return TCL_ERROR; } + + TclFreeIntRep(objPtr); + statePtr = ((Channel *) chan)->state; + Tcl_Preserve(statePtr); + SET_CHANNELSTATE(objPtr, statePtr); + SET_CHANNELINTERP(objPtr, interp); + objPtr->typePtr = &chanObjType; } return TCL_OK; } + +/* + *---------------------------------------------------------------------- + * + * FreeChannelIntRep -- + * + * Release statePtr storage. + * + * Results: + * None. + * + * Side effects: + * May cause state to be freed. + * + *---------------------------------------------------------------------- + */ + +static void +FreeChannelIntRep( + Tcl_Obj *objPtr) /* Object with internal rep to free. */ +{ + Tcl_Release(GET_CHANNELSTATE(objPtr)); + objPtr->typePtr = NULL; +} + +#if 0 +/* + * For future debugging work, a simple function to print the flags of a + * channel in semi-readable form. + */ + +static int +DumpFlags( + char *str, + int flags) +{ + char buf[20]; + int i = 0; + +#define ChanFlag(chr, bit) (buf[i++] = ((flags & (bit)) ? (chr) : '_')) + + ChanFlag('r', TCL_READABLE); + ChanFlag('w', TCL_WRITABLE); + ChanFlag('n', CHANNEL_NONBLOCKING); + ChanFlag('l', CHANNEL_LINEBUFFERED); + ChanFlag('u', CHANNEL_UNBUFFERED); + ChanFlag('R', BUFFER_READY); + ChanFlag('F', BG_FLUSH_SCHEDULED); + ChanFlag('c', CHANNEL_CLOSED); + ChanFlag('E', CHANNEL_EOF); + ChanFlag('S', CHANNEL_STICKY_EOF); + ChanFlag('B', CHANNEL_BLOCKED); + ChanFlag('/', INPUT_SAW_CR); + ChanFlag('*', INPUT_NEED_NL); + ChanFlag('D', CHANNEL_DEAD); + ChanFlag('R', CHANNEL_RAW_MODE); +#ifdef TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING + ChanFlag('T', CHANNEL_TIMER_FEV); + ChanFlag('H', CHANNEL_HAS_MORE_DATA); +#endif /* TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING */ + ChanFlag('x', CHANNEL_INCLOSE); + + buf[i] ='\0'; + + fprintf(stderr, "%s: %s\n", str, buf); + return 0; +} +#endif + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * tab-width: 8 + * indent-tabs-mode: nil + * End: + */ |