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Diffstat (limited to 'generic/tclIOUtil.c')
| -rw-r--r-- | generic/tclIOUtil.c | 4874 |
1 files changed, 4874 insertions, 0 deletions
diff --git a/generic/tclIOUtil.c b/generic/tclIOUtil.c new file mode 100644 index 0000000..e3a6b2a --- /dev/null +++ b/generic/tclIOUtil.c @@ -0,0 +1,4874 @@ +/* + * tclIOUtil.c -- + * + * This file contains the implementation of Tcl's generic filesystem + * code, which supports a pluggable filesystem architecture allowing both + * platform specific filesystems and 'virtual filesystems'. All + * filesystem access should go through the functions defined in this + * file. Most of this code was contributed by Vince Darley. + * + * Parts of this file are based on code contributed by Karl Lehenbauer, + * Mark Diekhans and Peter da Silva. + * + * Copyright (c) 1991-1994 The Regents of the University of California. + * Copyright (c) 1994-1997 Sun Microsystems, Inc. + * Copyright (c) 2001-2004 Vincent Darley. + * + * See the file "license.terms" for information on usage and redistribution of + * this file, and for a DISCLAIMER OF ALL WARRANTIES. + */ + +#include "tclInt.h" +#ifdef _WIN32 +# include "tclWinInt.h" +#endif +#include "tclFileSystem.h" + +#ifdef TCL_TEMPLOAD_NO_UNLINK +#ifndef NO_FSTATFS +#include <sys/statfs.h> +#endif +#endif + +/* + * struct FilesystemRecord -- + * + * A filesystem record is used to keep track of each filesystem currently + * registered with the core, in a linked list. + */ + +typedef struct FilesystemRecord { + ClientData clientData; /* Client specific data for the new filesystem + * (can be NULL) */ + const Tcl_Filesystem *fsPtr;/* Pointer to filesystem dispatch table. */ + struct FilesystemRecord *nextPtr; + /* The next filesystem registered to Tcl, or + * NULL if no more. */ + struct FilesystemRecord *prevPtr; + /* The previous filesystem registered to Tcl, + * or NULL if no more. */ +} FilesystemRecord; + +/* + * This structure holds per-thread private copy of the current directory + * maintained by the global cwdPathPtr. This structure holds per-thread + * private copies of some global data. This way we avoid most of the + * synchronization calls which boosts performance, at cost of having to update + * this information each time the corresponding epoch counter changes. + */ + +typedef struct ThreadSpecificData { + int initialized; + size_t cwdPathEpoch; + size_t filesystemEpoch; + Tcl_Obj *cwdPathPtr; + ClientData cwdClientData; + FilesystemRecord *filesystemList; + size_t claims; +} ThreadSpecificData; + +/* + * Prototypes for functions defined later in this file. + */ + +static Tcl_NRPostProc EvalFileCallback; +static FilesystemRecord*FsGetFirstFilesystem(void); +static void FsThrExitProc(ClientData cd); +static Tcl_Obj * FsListMounts(Tcl_Obj *pathPtr, const char *pattern); +static void FsAddMountsToGlobResult(Tcl_Obj *resultPtr, + Tcl_Obj *pathPtr, const char *pattern, + Tcl_GlobTypeData *types); +static void FsUpdateCwd(Tcl_Obj *cwdObj, ClientData clientData); +static void FsRecacheFilesystemList(void); +static void Claim(void); +static void Disclaim(void); + +static void * DivertFindSymbol(Tcl_Interp *interp, + Tcl_LoadHandle loadHandle, const char *symbol); +static void DivertUnloadFile(Tcl_LoadHandle loadHandle); + +/* + * These form part of the native filesystem support. They are needed here + * because we have a few native filesystem functions (which are the same for + * win/unix) in this file. There is no need to place them in tclInt.h, because + * they are not (and should not be) used anywhere else. + */ + +MODULE_SCOPE const char *const tclpFileAttrStrings[]; +MODULE_SCOPE const TclFileAttrProcs tclpFileAttrProcs[]; + +/* + * Declare the native filesystem support. These functions should be considered + * private to Tcl, and should really not be called directly by any code other + * than this file (i.e. neither by Tcl's core nor by extensions). Similarly, + * the old string-based Tclp... native filesystem functions should not be + * called. + * + * The correct API to use now is the Tcl_FS... set of functions, which ensure + * correct and complete virtual filesystem support. + * + * We cannot make all of these static, since some of them are implemented in + * the platform-specific directories. + */ + +static Tcl_FSFilesystemSeparatorProc NativeFilesystemSeparator; +static Tcl_FSFreeInternalRepProc NativeFreeInternalRep; +static Tcl_FSFileAttrStringsProc NativeFileAttrStrings; +static Tcl_FSFileAttrsGetProc NativeFileAttrsGet; +static Tcl_FSFileAttrsSetProc NativeFileAttrsSet; + +/* + * The only reason these functions are not static is that they are either + * called by code in the native (win/unix) directories or they are actually + * implemented in those directories. They should simply not be called by code + * outside Tcl's native filesystem core i.e. they should be considered + * 'static' to Tcl's filesystem code (if we ever built the native filesystem + * support into a separate code library, this could actually be enforced). + */ + +Tcl_FSFilesystemPathTypeProc TclpFilesystemPathType; +Tcl_FSInternalToNormalizedProc TclpNativeToNormalized; +Tcl_FSStatProc TclpObjStat; +Tcl_FSAccessProc TclpObjAccess; +Tcl_FSMatchInDirectoryProc TclpMatchInDirectory; +Tcl_FSChdirProc TclpObjChdir; +Tcl_FSLstatProc TclpObjLstat; +Tcl_FSCopyFileProc TclpObjCopyFile; +Tcl_FSDeleteFileProc TclpObjDeleteFile; +Tcl_FSRenameFileProc TclpObjRenameFile; +Tcl_FSCreateDirectoryProc TclpObjCreateDirectory; +Tcl_FSCopyDirectoryProc TclpObjCopyDirectory; +Tcl_FSRemoveDirectoryProc TclpObjRemoveDirectory; +Tcl_FSUnloadFileProc TclpUnloadFile; +Tcl_FSLinkProc TclpObjLink; +Tcl_FSListVolumesProc TclpObjListVolumes; + +/* + * Define the native filesystem dispatch table. If necessary, it is ok to make + * this non-static, but it should only be accessed by the functions actually + * listed within it (or perhaps other helper functions of them). Anything + * which is not part of this 'native filesystem implementation' should not be + * delving inside here! + */ + +const Tcl_Filesystem tclNativeFilesystem = { + "native", + sizeof(Tcl_Filesystem), + TCL_FILESYSTEM_VERSION_2, + TclNativePathInFilesystem, + TclNativeDupInternalRep, + NativeFreeInternalRep, + TclpNativeToNormalized, + TclNativeCreateNativeRep, + TclpObjNormalizePath, + TclpFilesystemPathType, + NativeFilesystemSeparator, + TclpObjStat, + TclpObjAccess, + TclpOpenFileChannel, + TclpMatchInDirectory, + TclpUtime, +#ifndef S_IFLNK + NULL, +#else + TclpObjLink, +#endif /* S_IFLNK */ + TclpObjListVolumes, + NativeFileAttrStrings, + NativeFileAttrsGet, + NativeFileAttrsSet, + TclpObjCreateDirectory, + TclpObjRemoveDirectory, + TclpObjDeleteFile, + TclpObjCopyFile, + TclpObjRenameFile, + TclpObjCopyDirectory, + TclpObjLstat, + /* Needs casts since we're using version_2. */ + (Tcl_FSLoadFileProc *) TclpDlopen, + (Tcl_FSGetCwdProc *) TclpGetNativeCwd, + TclpObjChdir +}; + +/* + * Define the tail of the linked list. Note that for unconventional uses of + * Tcl without a native filesystem, we may in the future wish to modify the + * current approach of hard-coding the native filesystem in the lookup list + * 'filesystemList' below. + * + * We initialize the record so that it thinks one file uses it. This means it + * will never be freed. + */ + +static FilesystemRecord nativeFilesystemRecord = { + NULL, + &tclNativeFilesystem, + NULL, + NULL +}; + +/* + * This is incremented each time we modify the linked list of filesystems. Any + * time it changes, all cached filesystem representations are suspect and must + * be freed. For multithreading builds, change of the filesystem epoch will + * trigger cache cleanup in all threads. + */ + +static size_t theFilesystemEpoch = 1; + +/* + * Stores the linked list of filesystems. A 1:1 copy of this list is also + * maintained in the TSD for each thread. This is to avoid synchronization + * issues. + */ + +static FilesystemRecord *filesystemList = &nativeFilesystemRecord; +TCL_DECLARE_MUTEX(filesystemMutex) + +/* + * Used to implement Tcl_FSGetCwd in a file-system independent way. + */ + +static Tcl_Obj *cwdPathPtr = NULL; +static size_t cwdPathEpoch = 0; +static ClientData cwdClientData = NULL; +TCL_DECLARE_MUTEX(cwdMutex) + +static Tcl_ThreadDataKey fsDataKey; + +/* + * One of these structures is used each time we successfully load a file from + * a file system by way of making a temporary copy of the file on the native + * filesystem. We need to store both the actual unloadProc/clientData + * combination which was used, and the original and modified filenames, so + * that we can correctly undo the entire operation when we want to unload the + * code. + */ + +typedef struct FsDivertLoad { + Tcl_LoadHandle loadHandle; + Tcl_FSUnloadFileProc *unloadProcPtr; + Tcl_Obj *divertedFile; + const Tcl_Filesystem *divertedFilesystem; + ClientData divertedFileNativeRep; +} FsDivertLoad; + +/* + * The following functions are obsolete string based APIs, and should be + * removed in a future release (Tcl 9 would be a good time). + */ + +/* Obsolete */ +int +Tcl_Stat( + const char *path, /* Path of file to stat (in current CP). */ + struct stat *oldStyleBuf) /* Filled with results of stat call. */ +{ + int ret; + Tcl_StatBuf buf; + Tcl_Obj *pathPtr = Tcl_NewStringObj(path,-1); + + Tcl_IncrRefCount(pathPtr); + ret = Tcl_FSStat(pathPtr, &buf); + Tcl_DecrRefCount(pathPtr); + if (ret != -1) { +#ifndef TCL_WIDE_INT_IS_LONG + Tcl_WideInt tmp1, tmp2, tmp3 = 0; + +# define OUT_OF_RANGE(x) \ + (((Tcl_WideInt)(x)) < Tcl_LongAsWide(LONG_MIN) || \ + ((Tcl_WideInt)(x)) > Tcl_LongAsWide(LONG_MAX)) +# define OUT_OF_URANGE(x) \ + (((Tcl_WideUInt)(x)) > ((Tcl_WideUInt)ULONG_MAX)) + + /* + * Perform the result-buffer overflow check manually. + * + * Note that ino_t/ino64_t is unsigned... + * + * Workaround gcc warning of "comparison is always false due to + * limited range of data type" by assigning to tmp var of type + * Tcl_WideInt. + */ + + tmp1 = (Tcl_WideInt) buf.st_ino; + tmp2 = (Tcl_WideInt) buf.st_size; +#ifdef HAVE_STRUCT_STAT_ST_BLOCKS + tmp3 = (Tcl_WideInt) buf.st_blocks; +#endif + + if (OUT_OF_URANGE(tmp1) || OUT_OF_RANGE(tmp2) || OUT_OF_RANGE(tmp3)) { +#if defined(EFBIG) + errno = EFBIG; +#elif defined(EOVERFLOW) + errno = EOVERFLOW; +#else +#error "What status should be returned for file size out of range?" +#endif + return -1; + } + +# undef OUT_OF_RANGE +# undef OUT_OF_URANGE +#endif /* !TCL_WIDE_INT_IS_LONG */ + + /* + * Copy across all supported fields, with possible type coercions on + * those fields that change between the normal and lf64 versions of + * the stat structure (on Solaris at least). This is slow when the + * structure sizes coincide, but that's what you get for using an + * obsolete interface. + */ + + oldStyleBuf->st_mode = buf.st_mode; + oldStyleBuf->st_ino = (ino_t) buf.st_ino; + oldStyleBuf->st_dev = buf.st_dev; + oldStyleBuf->st_rdev = buf.st_rdev; + oldStyleBuf->st_nlink = buf.st_nlink; + oldStyleBuf->st_uid = buf.st_uid; + oldStyleBuf->st_gid = buf.st_gid; + oldStyleBuf->st_size = (off_t) buf.st_size; + oldStyleBuf->st_atime = buf.st_atime; + oldStyleBuf->st_mtime = buf.st_mtime; + oldStyleBuf->st_ctime = buf.st_ctime; +#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE + oldStyleBuf->st_blksize = buf.st_blksize; +#endif +#ifdef HAVE_STRUCT_STAT_ST_BLOCKS +#ifdef HAVE_BLKCNT_T + oldStyleBuf->st_blocks = (blkcnt_t) buf.st_blocks; +#else + oldStyleBuf->st_blocks = (unsigned long) buf.st_blocks; +#endif +#endif + } + return ret; +} + +/* Obsolete */ +int +Tcl_Access( + const char *path, /* Path of file to access (in current CP). */ + int mode) /* Permission setting. */ +{ + int ret; + Tcl_Obj *pathPtr = Tcl_NewStringObj(path,-1); + + Tcl_IncrRefCount(pathPtr); + ret = Tcl_FSAccess(pathPtr,mode); + Tcl_DecrRefCount(pathPtr); + + return ret; +} + +/* Obsolete */ +Tcl_Channel +Tcl_OpenFileChannel( + Tcl_Interp *interp, /* Interpreter for error reporting; can be + * NULL. */ + const char *path, /* Name of file to open. */ + const char *modeString, /* A list of POSIX open modes or a string such + * as "rw". */ + int permissions) /* If the open involves creating a file, with + * what modes to create it? */ +{ + Tcl_Channel ret; + Tcl_Obj *pathPtr = Tcl_NewStringObj(path,-1); + + Tcl_IncrRefCount(pathPtr); + ret = Tcl_FSOpenFileChannel(interp, pathPtr, modeString, permissions); + Tcl_DecrRefCount(pathPtr); + + return ret; +} + +/* Obsolete */ +int +Tcl_Chdir( + const char *dirName) +{ + int ret; + Tcl_Obj *pathPtr = Tcl_NewStringObj(dirName,-1); + Tcl_IncrRefCount(pathPtr); + ret = Tcl_FSChdir(pathPtr); + Tcl_DecrRefCount(pathPtr); + return ret; +} + +/* Obsolete */ +char * +Tcl_GetCwd( + Tcl_Interp *interp, + Tcl_DString *cwdPtr) +{ + Tcl_Obj *cwd = Tcl_FSGetCwd(interp); + + if (cwd == NULL) { + return NULL; + } + Tcl_DStringInit(cwdPtr); + TclDStringAppendObj(cwdPtr, cwd); + Tcl_DecrRefCount(cwd); + return Tcl_DStringValue(cwdPtr); +} + +/* Obsolete */ +int +Tcl_EvalFile( + Tcl_Interp *interp, /* Interpreter in which to process file. */ + const char *fileName) /* Name of file to process. Tilde-substitution + * will be performed on this name. */ +{ + int ret; + Tcl_Obj *pathPtr = Tcl_NewStringObj(fileName,-1); + + Tcl_IncrRefCount(pathPtr); + ret = Tcl_FSEvalFile(interp, pathPtr); + Tcl_DecrRefCount(pathPtr); + return ret; +} + +/* + * Now move on to the basic filesystem implementation. + */ + +static void +FsThrExitProc( + ClientData cd) +{ + ThreadSpecificData *tsdPtr = cd; + FilesystemRecord *fsRecPtr = NULL, *tmpFsRecPtr = NULL; + + /* + * Trash the cwd copy. + */ + + if (tsdPtr->cwdPathPtr != NULL) { + Tcl_DecrRefCount(tsdPtr->cwdPathPtr); + tsdPtr->cwdPathPtr = NULL; + } + if (tsdPtr->cwdClientData != NULL) { + NativeFreeInternalRep(tsdPtr->cwdClientData); + } + + /* + * Trash the filesystems cache. + */ + + fsRecPtr = tsdPtr->filesystemList; + while (fsRecPtr != NULL) { + tmpFsRecPtr = fsRecPtr->nextPtr; + fsRecPtr->fsPtr = NULL; + ckfree(fsRecPtr); + fsRecPtr = tmpFsRecPtr; + } + tsdPtr->filesystemList = NULL; + tsdPtr->initialized = 0; +} + +int +TclFSCwdIsNative(void) +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); + + if (tsdPtr->cwdClientData != NULL) { + return 1; + } else { + return 0; + } +} + +/* + *---------------------------------------------------------------------- + * + * TclFSCwdPointerEquals -- + * + * Check whether the current working directory is equal to the path + * given. + * + * Results: + * 1 (equal) or 0 (un-equal) as appropriate. + * + * Side effects: + * If the paths are equal, but are not the same object, this method will + * modify the given pathPtrPtr to refer to the same object. In this case + * the object pointed to by pathPtrPtr will have its refCount + * decremented, and it will be adjusted to point to the cwd (with a new + * refCount). + * + *---------------------------------------------------------------------- + */ + +int +TclFSCwdPointerEquals( + Tcl_Obj **pathPtrPtr) +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); + + Tcl_MutexLock(&cwdMutex); + if (tsdPtr->cwdPathPtr == NULL + || tsdPtr->cwdPathEpoch != cwdPathEpoch) { + if (tsdPtr->cwdPathPtr != NULL) { + Tcl_DecrRefCount(tsdPtr->cwdPathPtr); + } + if (tsdPtr->cwdClientData != NULL) { + NativeFreeInternalRep(tsdPtr->cwdClientData); + } + if (cwdPathPtr == NULL) { + tsdPtr->cwdPathPtr = NULL; + } else { + tsdPtr->cwdPathPtr = Tcl_DuplicateObj(cwdPathPtr); + Tcl_IncrRefCount(tsdPtr->cwdPathPtr); + } + if (cwdClientData == NULL) { + tsdPtr->cwdClientData = NULL; + } else { + tsdPtr->cwdClientData = TclNativeDupInternalRep(cwdClientData); + } + tsdPtr->cwdPathEpoch = cwdPathEpoch; + } + Tcl_MutexUnlock(&cwdMutex); + + if (tsdPtr->initialized == 0) { + Tcl_CreateThreadExitHandler(FsThrExitProc, tsdPtr); + tsdPtr->initialized = 1; + } + + if (pathPtrPtr == NULL) { + return (tsdPtr->cwdPathPtr == NULL); + } + + if (tsdPtr->cwdPathPtr == *pathPtrPtr) { + return 1; + } else { + int len1, len2; + const char *str1, *str2; + + str1 = TclGetStringFromObj(tsdPtr->cwdPathPtr, &len1); + str2 = TclGetStringFromObj(*pathPtrPtr, &len2); + if ((len1 == len2) && !memcmp(str1, str2, len1)) { + /* + * They are equal, but different objects. Update so they will be + * the same object in the future. + */ + + Tcl_DecrRefCount(*pathPtrPtr); + *pathPtrPtr = tsdPtr->cwdPathPtr; + Tcl_IncrRefCount(*pathPtrPtr); + return 1; + } else { + return 0; + } + } +} + +static void +FsRecacheFilesystemList(void) +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); + FilesystemRecord *fsRecPtr, *tmpFsRecPtr = NULL, *toFree = NULL, *list; + + /* + * Trash the current cache. + */ + + fsRecPtr = tsdPtr->filesystemList; + while (fsRecPtr != NULL) { + tmpFsRecPtr = fsRecPtr->nextPtr; + fsRecPtr->nextPtr = toFree; + toFree = fsRecPtr; + fsRecPtr = tmpFsRecPtr; + } + + /* + * Locate tail of the global filesystem list. + */ + + Tcl_MutexLock(&filesystemMutex); + fsRecPtr = filesystemList; + while (fsRecPtr != NULL) { + tmpFsRecPtr = fsRecPtr; + fsRecPtr = fsRecPtr->nextPtr; + } + + /* + * Refill the cache honouring the order. + */ + + list = NULL; + fsRecPtr = tmpFsRecPtr; + while (fsRecPtr != NULL) { + tmpFsRecPtr = ckalloc(sizeof(FilesystemRecord)); + *tmpFsRecPtr = *fsRecPtr; + tmpFsRecPtr->nextPtr = list; + tmpFsRecPtr->prevPtr = NULL; + list = tmpFsRecPtr; + fsRecPtr = fsRecPtr->prevPtr; + } + tsdPtr->filesystemList = list; + tsdPtr->filesystemEpoch = theFilesystemEpoch; + Tcl_MutexUnlock(&filesystemMutex); + + while (toFree) { + FilesystemRecord *next = toFree->nextPtr; + toFree->fsPtr = NULL; + ckfree(toFree); + toFree = next; + } + + /* + * Make sure the above gets released on thread exit. + */ + + if (tsdPtr->initialized == 0) { + Tcl_CreateThreadExitHandler(FsThrExitProc, tsdPtr); + tsdPtr->initialized = 1; + } +} + +static FilesystemRecord * +FsGetFirstFilesystem(void) +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); + if (tsdPtr->filesystemList == NULL || ((tsdPtr->claims == 0) + && (tsdPtr->filesystemEpoch != theFilesystemEpoch))) { + FsRecacheFilesystemList(); + } + return tsdPtr->filesystemList; +} + +/* + * The epoch can be changed by filesystems being added or removed, by changing + * the "system encoding" and by env(HOME) changing. + */ + +int +TclFSEpochOk( + size_t filesystemEpoch) +{ + return (filesystemEpoch == 0 || filesystemEpoch == theFilesystemEpoch); +} + +static void +Claim(void) +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); + + tsdPtr->claims++; +} + +static void +Disclaim(void) +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); + + tsdPtr->claims--; +} + +size_t +TclFSEpoch(void) +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); + + return tsdPtr->filesystemEpoch; +} + + +/* + * If non-NULL, clientData is owned by us and must be freed later. + */ + +static void +FsUpdateCwd( + Tcl_Obj *cwdObj, + ClientData clientData) +{ + int len; + const char *str = NULL; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); + + if (cwdObj != NULL) { + str = TclGetStringFromObj(cwdObj, &len); + } + + Tcl_MutexLock(&cwdMutex); + if (cwdPathPtr != NULL) { + Tcl_DecrRefCount(cwdPathPtr); + } + if (cwdClientData != NULL) { + NativeFreeInternalRep(cwdClientData); + } + + if (cwdObj == NULL) { + cwdPathPtr = NULL; + cwdClientData = NULL; + } else { + /* + * This must be stored as string obj! + */ + + cwdPathPtr = Tcl_NewStringObj(str, len); + Tcl_IncrRefCount(cwdPathPtr); + cwdClientData = TclNativeDupInternalRep(clientData); + } + + if (++cwdPathEpoch == 0) { + ++cwdPathEpoch; + } + tsdPtr->cwdPathEpoch = cwdPathEpoch; + Tcl_MutexUnlock(&cwdMutex); + + if (tsdPtr->cwdPathPtr) { + Tcl_DecrRefCount(tsdPtr->cwdPathPtr); + } + if (tsdPtr->cwdClientData) { + NativeFreeInternalRep(tsdPtr->cwdClientData); + } + + if (cwdObj == NULL) { + tsdPtr->cwdPathPtr = NULL; + tsdPtr->cwdClientData = NULL; + } else { + tsdPtr->cwdPathPtr = Tcl_NewStringObj(str, len); + tsdPtr->cwdClientData = clientData; + Tcl_IncrRefCount(tsdPtr->cwdPathPtr); + } +} + +/* + *---------------------------------------------------------------------- + * + * TclFinalizeFilesystem -- + * + * Clean up the filesystem. After this, calls to all Tcl_FS... functions + * will fail. + * + * We will later call TclResetFilesystem to restore the FS to a pristine + * state. + * + * Results: + * None. + * + * Side effects: + * Frees any memory allocated by the filesystem. + * + *---------------------------------------------------------------------- + */ + +void +TclFinalizeFilesystem(void) +{ + FilesystemRecord *fsRecPtr; + + /* + * Assumption that only one thread is active now. Otherwise we would need + * to put various mutexes around this code. + */ + + if (cwdPathPtr != NULL) { + Tcl_DecrRefCount(cwdPathPtr); + cwdPathPtr = NULL; + cwdPathEpoch = 0; + } + if (cwdClientData != NULL) { + NativeFreeInternalRep(cwdClientData); + cwdClientData = NULL; + } + + /* + * Remove all filesystems, freeing any allocated memory that is no longer + * needed. + */ + + fsRecPtr = filesystemList; + while (fsRecPtr != NULL) { + FilesystemRecord *tmpFsRecPtr = fsRecPtr->nextPtr; + + /* The native filesystem is static, so we don't free it. */ + + if (fsRecPtr != &nativeFilesystemRecord) { + ckfree(fsRecPtr); + } + fsRecPtr = tmpFsRecPtr; + } + if (++theFilesystemEpoch == 0) { + ++theFilesystemEpoch; + } + filesystemList = NULL; + + /* + * Now filesystemList is NULL. This means that any attempt to use the + * filesystem is likely to fail. + */ + +#ifdef _WIN32 + TclWinEncodingsCleanup(); +#endif +} + +/* + *---------------------------------------------------------------------- + * + * TclResetFilesystem -- + * + * Restore the filesystem to a pristine state. + * + * Results: + * None. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +void +TclResetFilesystem(void) +{ + filesystemList = &nativeFilesystemRecord; + if (++theFilesystemEpoch == 0) { + ++theFilesystemEpoch; + } + +#ifdef _WIN32 + /* + * Cleans up the win32 API filesystem proc lookup table. This must happen + * very late in finalization so that deleting of copied dlls can occur. + */ + + TclWinResetInterfaces(); +#endif +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSRegister -- + * + * Insert the filesystem function table at the head of the list of + * functions which are used during calls to all file-system operations. + * The filesystem will be added even if it is already in the list. (You + * can use Tcl_FSData to check if it is in the list, provided the + * ClientData used was not NULL). + * + * Note that the filesystem handling is head-to-tail of the list. Each + * filesystem is asked in turn whether it can handle a particular + * request, until one of them says 'yes'. At that point no further + * filesystems are asked. + * + * In particular this means if you want to add a diagnostic filesystem + * (which simply reports all fs activity), it must be at the head of the + * list: i.e. it must be the last registered. + * + * Results: + * Normally TCL_OK; TCL_ERROR if memory for a new node in the list could + * not be allocated. + * + * Side effects: + * Memory allocated and modifies the link list for filesystems. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSRegister( + ClientData clientData, /* Client specific data for this fs. */ + const Tcl_Filesystem *fsPtr)/* The filesystem record for the new fs. */ +{ + FilesystemRecord *newFilesystemPtr; + + if (fsPtr == NULL) { + return TCL_ERROR; + } + + newFilesystemPtr = ckalloc(sizeof(FilesystemRecord)); + + newFilesystemPtr->clientData = clientData; + newFilesystemPtr->fsPtr = fsPtr; + + /* + * Is this lock and wait strictly speaking necessary? Since any iterators + * out there will have grabbed a copy of the head of the list and be + * iterating away from that, if we add a new element to the head of the + * list, it can't possibly have any effect on any of their loops. In fact + * it could be better not to wait, since we are adjusting the filesystem + * epoch, any cached representations calculated by existing iterators are + * going to have to be thrown away anyway. + * + * However, since registering and unregistering filesystems is a very rare + * action, this is not a very important point. + */ + + Tcl_MutexLock(&filesystemMutex); + + newFilesystemPtr->nextPtr = filesystemList; + newFilesystemPtr->prevPtr = NULL; + if (filesystemList) { + filesystemList->prevPtr = newFilesystemPtr; + } + filesystemList = newFilesystemPtr; + + /* + * Increment the filesystem epoch counter, since existing paths might + * conceivably now belong to different filesystems. + */ + + if (++theFilesystemEpoch == 0) { + ++theFilesystemEpoch; + } + Tcl_MutexUnlock(&filesystemMutex); + + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSUnregister -- + * + * Remove the passed filesystem from the list of filesystem function + * tables. It also ensures that the built-in (native) filesystem is not + * removable, although we may wish to change that decision in the future + * to allow a smaller Tcl core, in which the native filesystem is not + * used at all (we could, say, initialise Tcl completely over a network + * connection). + * + * Results: + * TCL_OK if the function pointer was successfully removed, TCL_ERROR + * otherwise. + * + * Side effects: + * Memory may be deallocated (or will be later, once no "path" objects + * refer to this filesystem), but the list of registered filesystems is + * updated immediately. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSUnregister( + const Tcl_Filesystem *fsPtr) /* The filesystem record to remove. */ +{ + int retVal = TCL_ERROR; + FilesystemRecord *fsRecPtr; + + Tcl_MutexLock(&filesystemMutex); + + /* + * Traverse the 'filesystemList' looking for the particular node whose + * 'fsPtr' member matches 'fsPtr' and remove that one from the list. + * Ensure that the "default" node cannot be removed. + */ + + fsRecPtr = filesystemList; + while ((retVal == TCL_ERROR) && (fsRecPtr != &nativeFilesystemRecord)) { + if (fsRecPtr->fsPtr == fsPtr) { + if (fsRecPtr->prevPtr) { + fsRecPtr->prevPtr->nextPtr = fsRecPtr->nextPtr; + } else { + filesystemList = fsRecPtr->nextPtr; + } + if (fsRecPtr->nextPtr) { + fsRecPtr->nextPtr->prevPtr = fsRecPtr->prevPtr; + } + + /* + * Increment the filesystem epoch counter, since existing paths + * might conceivably now belong to different filesystems. This + * should also ensure that paths which have cached the filesystem + * which is about to be deleted do not reference that filesystem + * (which would of course lead to memory exceptions). + */ + + if (++theFilesystemEpoch == 0) { + ++theFilesystemEpoch; + } + + ckfree(fsRecPtr); + + retVal = TCL_OK; + } else { + fsRecPtr = fsRecPtr->nextPtr; + } + } + + Tcl_MutexUnlock(&filesystemMutex); + return retVal; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSMatchInDirectory -- + * + * This routine is used by the globbing code to search a directory for + * all files which match a given pattern. The appropriate function for + * the filesystem to which pathPtr belongs will be called. If pathPtr + * does not belong to any filesystem and if it is NULL or the empty + * string, then we assume the pattern is to be matched in the current + * working directory. To avoid have the Tcl_FSMatchInDirectoryProc for + * each filesystem from having to deal with this issue, we create a + * pathPtr on the fly (equal to the cwd), and then remove it from the + * results returned. This makes filesystems easy to write, since they can + * assume the pathPtr passed to them is an ordinary path. In fact this + * means we could remove such special case handling from Tcl's native + * filesystems. + * + * If 'pattern' is NULL, then pathPtr is assumed to be a fully specified + * path of a single file/directory which must be checked for existence + * and correct type. + * + * Results: + * + * The return value is a standard Tcl result indicating whether an error + * occurred in globbing. Error messages are placed in interp, but good + * results are placed in the resultPtr given. + * + * Recursive searches, e.g. + * glob -dir $dir -join * pkgIndex.tcl + * which must recurse through each directory matching '*' are handled + * internally by Tcl, by passing specific flags in a modified 'types' + * parameter. This means the actual filesystem only ever sees patterns + * which match in a single directory. + * + * Side effects: + * The interpreter may have an error message inserted into it. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSMatchInDirectory( + Tcl_Interp *interp, /* Interpreter to receive error messages, but + * may be NULL. */ + Tcl_Obj *resultPtr, /* List object to receive results. */ + Tcl_Obj *pathPtr, /* Contains path to directory to search. */ + const char *pattern, /* Pattern to match against. */ + Tcl_GlobTypeData *types) /* Object containing list of acceptable types. + * May be NULL. In particular the directory + * flag is very important. */ +{ + const Tcl_Filesystem *fsPtr; + Tcl_Obj *cwd, *tmpResultPtr, **elemsPtr; + int resLength, i, ret = -1; + + if (types != NULL && (types->type & TCL_GLOB_TYPE_MOUNT)) { + /* + * We don't currently allow querying of mounts by external code (a + * valuable future step), so since we're the only function that + * actually knows about mounts, this means we're being called + * recursively by ourself. Return no matches. + */ + + return TCL_OK; + } + + if (pathPtr != NULL) { + fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + } else { + fsPtr = NULL; + } + + /* + * Check if we've successfully mapped the path to a filesystem within + * which to search. + */ + + if (fsPtr != NULL) { + if (fsPtr->matchInDirectoryProc == NULL) { + Tcl_SetErrno(ENOENT); + return -1; + } + ret = fsPtr->matchInDirectoryProc(interp, resultPtr, pathPtr, pattern, + types); + if (ret == TCL_OK && pattern != NULL) { + FsAddMountsToGlobResult(resultPtr, pathPtr, pattern, types); + } + return ret; + } + + /* + * If the path isn't empty, we have no idea how to match files in a + * directory which belongs to no known filesystem. + */ + + if (pathPtr != NULL && TclGetString(pathPtr)[0] != '\0') { + Tcl_SetErrno(ENOENT); + return -1; + } + + /* + * We have an empty or NULL path. This is defined to mean we must search + * for files within the current 'cwd'. We therefore use that, but then + * since the proc we call will return results which include the cwd we + * must then trim it off the front of each path in the result. We choose + * to deal with this here (in the generic code), since if we don't, every + * single filesystem's implementation of Tcl_FSMatchInDirectory will have + * to deal with it for us. + */ + + cwd = Tcl_FSGetCwd(NULL); + if (cwd == NULL) { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "glob couldn't determine the current working directory", + -1)); + } + return TCL_ERROR; + } + + fsPtr = Tcl_FSGetFileSystemForPath(cwd); + if (fsPtr != NULL && fsPtr->matchInDirectoryProc != NULL) { + TclNewObj(tmpResultPtr); + Tcl_IncrRefCount(tmpResultPtr); + ret = fsPtr->matchInDirectoryProc(interp, tmpResultPtr, cwd, pattern, + types); + if (ret == TCL_OK) { + FsAddMountsToGlobResult(tmpResultPtr, cwd, pattern, types); + + /* + * Note that we know resultPtr and tmpResultPtr are distinct. + */ + + ret = Tcl_ListObjGetElements(interp, tmpResultPtr, + &resLength, &elemsPtr); + for (i=0 ; ret==TCL_OK && i<resLength ; i++) { + ret = Tcl_ListObjAppendElement(interp, resultPtr, + TclFSMakePathRelative(interp, elemsPtr[i], cwd)); + } + } + TclDecrRefCount(tmpResultPtr); + } + Tcl_DecrRefCount(cwd); + return ret; +} + +/* + *---------------------------------------------------------------------- + * + * FsAddMountsToGlobResult -- + * + * This routine is used by the globbing code to take the results of a + * directory listing and add any mounted paths to that listing. This is + * required so that simple things like 'glob *' merge mounts and listings + * correctly. + * + * Results: + * None. + * + * Side effects: + * Modifies the resultPtr. + * + *---------------------------------------------------------------------- + */ + +static void +FsAddMountsToGlobResult( + Tcl_Obj *resultPtr, /* The current list of matching paths; must + * not be shared! */ + Tcl_Obj *pathPtr, /* The directory in question. */ + const char *pattern, /* Pattern to match against. */ + Tcl_GlobTypeData *types) /* Object containing list of acceptable types. + * May be NULL. In particular the directory + * flag is very important. */ +{ + int mLength, gLength, i; + int dir = (types == NULL || (types->type & TCL_GLOB_TYPE_DIR)); + Tcl_Obj *mounts = FsListMounts(pathPtr, pattern); + + if (mounts == NULL) { + return; + } + + if (Tcl_ListObjLength(NULL, mounts, &mLength) != TCL_OK || mLength == 0) { + goto endOfMounts; + } + if (Tcl_ListObjLength(NULL, resultPtr, &gLength) != TCL_OK) { + goto endOfMounts; + } + for (i=0 ; i<mLength ; i++) { + Tcl_Obj *mElt; + int j; + int found = 0; + + Tcl_ListObjIndex(NULL, mounts, i, &mElt); + + for (j=0 ; j<gLength ; j++) { + Tcl_Obj *gElt; + + Tcl_ListObjIndex(NULL, resultPtr, j, &gElt); + if (Tcl_FSEqualPaths(mElt, gElt)) { + found = 1; + if (!dir) { + /* + * We don't want to list this. + */ + + Tcl_ListObjReplace(NULL, resultPtr, j, 1, 0, NULL); + gLength--; + } + break; /* Break out of for loop. */ + } + } + if (!found && dir) { + Tcl_Obj *norm; + int len, mlen; + + /* + * We know mElt is absolute normalized and lies inside pathPtr, so + * now we must add to the result the right representation of mElt, + * i.e. the representation which is relative to pathPtr. + */ + + norm = Tcl_FSGetNormalizedPath(NULL, pathPtr); + if (norm != NULL) { + const char *path, *mount; + + mount = TclGetStringFromObj(mElt, &mlen); + path = TclGetStringFromObj(norm, &len); + if (path[len-1] == '/') { + /* + * Deal with the root of the volume. + */ + + len--; + } + len++; /* account for '/' in the mElt [Bug 1602539] */ + mElt = TclNewFSPathObj(pathPtr, mount + len, mlen - len); + Tcl_ListObjAppendElement(NULL, resultPtr, mElt); + } + /* + * No need to increment gLength, since we don't want to compare + * mounts against mounts. + */ + } + } + + endOfMounts: + Tcl_DecrRefCount(mounts); +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSMountsChanged -- + * + * Notify the filesystem that the available mounted filesystems (or + * within any one filesystem type, the number or location of mount + * points) have changed. + * + * Results: + * None. + * + * Side effects: + * The global filesystem variable 'theFilesystemEpoch' is incremented. + * The effect of this is to make all cached path representations invalid. + * Clearly it should only therefore be called when it is really required! + * There are a few circumstances when it should be called: + * + * (1) when a new filesystem is registered or unregistered. Strictly + * speaking this is only necessary if the new filesystem accepts file + * paths as is (normally the filesystem itself is really a shell which + * hasn't yet had any mount points established and so its + * 'pathInFilesystem' proc will always fail). However, for safety, Tcl + * always calls this for you in these circumstances. + * + * (2) when additional mount points are established inside any existing + * filesystem (except the native fs) + * + * (3) when any filesystem (except the native fs) changes the list of + * available volumes. + * + * (4) when the mapping from a string representation of a file to a full, + * normalized path changes. For example, if 'env(HOME)' is modified, then + * any path containing '~' will map to a different filesystem location. + * Therefore all such paths need to have their internal representation + * invalidated. + * + * Tcl has no control over (2) and (3), so any registered filesystem must + * make sure it calls this function when those situations occur. + * + * (Note: the reason for the exception in 2,3 for the native filesystem + * is that the native filesystem by default claims all unknown files even + * if it really doesn't understand them or if they don't exist). + * + *---------------------------------------------------------------------- + */ + +void +Tcl_FSMountsChanged( + const Tcl_Filesystem *fsPtr) +{ + /* + * We currently don't do anything with this parameter. We could in the + * future only invalidate files for this filesystem or otherwise take more + * advanced action. + */ + + (void)fsPtr; + + /* + * Increment the filesystem epoch counter, since existing paths might now + * belong to different filesystems. + */ + + Tcl_MutexLock(&filesystemMutex); + if (++theFilesystemEpoch == 0) { + ++theFilesystemEpoch; + } + Tcl_MutexUnlock(&filesystemMutex); +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSData -- + * + * Retrieve the clientData field for the filesystem given, or NULL if + * that filesystem is not registered. + * + * Results: + * A clientData value, or NULL. Note that if the filesystem was + * registered with a NULL clientData field, this function will return + * that NULL value. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +ClientData +Tcl_FSData( + const Tcl_Filesystem *fsPtr) /* The filesystem record to query. */ +{ + ClientData retVal = NULL; + FilesystemRecord *fsRecPtr = FsGetFirstFilesystem(); + + /* + * Traverse the list of filesystems look for a particular one. If found, + * return that filesystem's clientData (originally provided when calling + * Tcl_FSRegister). + */ + + while ((retVal == NULL) && (fsRecPtr != NULL)) { + if (fsRecPtr->fsPtr == fsPtr) { + retVal = fsRecPtr->clientData; + } + fsRecPtr = fsRecPtr->nextPtr; + } + + return retVal; +} + +/* + *--------------------------------------------------------------------------- + * + * TclFSNormalizeToUniquePath -- + * + * Takes a path specification containing no ../, ./ sequences, and + * converts it into a unique path for the given platform. On Unix, this + * means the path must be free of symbolic links/aliases, and on Windows + * it means we want the long form, with that long form's case-dependence + * (which gives us a unique, case-dependent path). + * + * Results: + * The pathPtr is modified in place. The return value is the last byte + * offset which was recognised in the path string. + * + * Side effects: + * None (beyond the memory allocation for the result). + * + * Special notes: + * If the filesystem-specific normalizePathProcs can re-introduce ../, ./ + * sequences into the path, then this function will not return the + * correct result. This may be possible with symbolic links on unix. + * + * Important assumption: if startAt is non-zero, it must point to a + * directory separator that we know exists and is already normalized (so + * it is important not to point to the char just after the separator). + * + *--------------------------------------------------------------------------- + */ + +int +TclFSNormalizeToUniquePath( + Tcl_Interp *interp, /* Used for error messages. */ + Tcl_Obj *pathPtr, /* The path to normalize in place. */ + int startAt) /* Start at this char-offset. */ +{ + FilesystemRecord *fsRecPtr, *firstFsRecPtr; + + /* + * Call each of the "normalise path" functions in succession. This is a + * special case, in which if we have a native filesystem handler, we call + * it first. This is because the root of Tcl's filesystem is always a + * native filesystem (i.e. '/' on unix is native). + */ + + firstFsRecPtr = FsGetFirstFilesystem(); + + Claim(); + for (fsRecPtr=firstFsRecPtr; fsRecPtr!=NULL; fsRecPtr=fsRecPtr->nextPtr) { + if (fsRecPtr->fsPtr != &tclNativeFilesystem) { + continue; + } + + /* + * TODO: Assume that we always find the native file system; it should + * always be there... + */ + + if (fsRecPtr->fsPtr->normalizePathProc != NULL) { + startAt = fsRecPtr->fsPtr->normalizePathProc(interp, pathPtr, + startAt); + } + break; + } + + for (fsRecPtr=firstFsRecPtr; fsRecPtr!=NULL; fsRecPtr=fsRecPtr->nextPtr) { + /* + * Skip the native system next time through. + */ + + if (fsRecPtr->fsPtr == &tclNativeFilesystem) { + continue; + } + + if (fsRecPtr->fsPtr->normalizePathProc != NULL) { + startAt = fsRecPtr->fsPtr->normalizePathProc(interp, pathPtr, + startAt); + } + + /* + * We could add an efficiency check like this: + * if (retVal == length-of(pathPtr)) {break;} + * but there's not much benefit. + */ + } + Disclaim(); + + return startAt; +} + +/* + *--------------------------------------------------------------------------- + * + * TclGetOpenMode -- + * + * This routine is an obsolete, limited version of TclGetOpenModeEx() + * below. It exists only to satisfy any extensions imprudently using it + * via Tcl's internal stubs table. + * + * Results: + * Same as TclGetOpenModeEx(). + * + * Side effects: + * Same as TclGetOpenModeEx(). + * + *--------------------------------------------------------------------------- + */ + +int +TclGetOpenMode( + Tcl_Interp *interp, /* Interpreter to use for error reporting - + * may be NULL. */ + const char *modeString, /* Mode string, e.g. "r+" or "RDONLY CREAT" */ + int *seekFlagPtr) /* Set this to 1 if the caller should seek to + * EOF during the opening of the file. */ +{ + int binary = 0; + return TclGetOpenModeEx(interp, modeString, seekFlagPtr, &binary); +} + +/* + *--------------------------------------------------------------------------- + * + * TclGetOpenModeEx -- + * + * Computes a POSIX mode mask for opening a file, from a given string, + * and also sets flags to indicate whether the caller should seek to EOF + * after opening the file, and whether the caller should configure the + * channel for binary data. + * + * Results: + * On success, returns mode to pass to "open". If an error occurs, the + * return value is -1 and if interp is not NULL, sets interp's result + * object to an error message. + * + * Side effects: + * Sets the integer referenced by seekFlagPtr to 1 to tell the caller to + * seek to EOF after opening the file, or to 0 otherwise. Sets the + * integer referenced by binaryPtr to 1 to tell the caller to seek to + * configure the channel for binary data, or to 0 otherwise. + * + * Special note: + * This code is based on a prototype implementation contributed by Mark + * Diekhans. + * + *--------------------------------------------------------------------------- + */ + +int +TclGetOpenModeEx( + Tcl_Interp *interp, /* Interpreter to use for error reporting - + * may be NULL. */ + const char *modeString, /* Mode string, e.g. "r+" or "RDONLY CREAT" */ + int *seekFlagPtr, /* Set this to 1 if the caller should seek to + * EOF during the opening of the file. */ + int *binaryPtr) /* Set this to 1 if the caller should + * configure the opened channel for binary + * operations. */ +{ + int mode, modeArgc, c, i, gotRW; + const char **modeArgv, *flag; +#define RW_MODES (O_RDONLY|O_WRONLY|O_RDWR) + + /* + * Check for the simpler fopen-like access modes (e.g. "r"). They are + * distinguished from the POSIX access modes by the presence of a + * lower-case first letter. + */ + + *seekFlagPtr = 0; + *binaryPtr = 0; + mode = 0; + + /* + * Guard against international characters before using byte oriented + * routines. + */ + + if (!(modeString[0] & 0x80) + && islower(UCHAR(modeString[0]))) { /* INTL: ISO only. */ + switch (modeString[0]) { + case 'r': + mode = O_RDONLY; + break; + case 'w': + mode = O_WRONLY|O_CREAT|O_TRUNC; + break; + case 'a': + /* + * Added O_APPEND for proper automatic seek-to-end-on-write by the + * OS. [Bug 680143] + */ + + mode = O_WRONLY|O_CREAT|O_APPEND; + *seekFlagPtr = 1; + break; + default: + goto error; + } + i = 1; + while (i<3 && modeString[i]) { + if (modeString[i] == modeString[i-1]) { + goto error; + } + switch (modeString[i++]) { + case '+': + /* + * Must remove the O_APPEND flag so that the seek command + * works. [Bug 1773127] + */ + + mode &= ~(O_RDONLY|O_WRONLY|O_APPEND); + mode |= O_RDWR; + break; + case 'b': + *binaryPtr = 1; + break; + default: + goto error; + } + } + if (modeString[i] != 0) { + goto error; + } + return mode; + + error: + *seekFlagPtr = 0; + *binaryPtr = 0; + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "illegal access mode \"%s\"", modeString)); + } + return -1; + } + + /* + * The access modes are specified using a list of POSIX modes such as + * O_CREAT. + * + * IMPORTANT NOTE: We rely on Tcl_SplitList working correctly when a NULL + * interpreter is passed in. + */ + + if (Tcl_SplitList(interp, modeString, &modeArgc, &modeArgv) != TCL_OK) { + if (interp != NULL) { + Tcl_AddErrorInfo(interp, + "\n while processing open access modes \""); + Tcl_AddErrorInfo(interp, modeString); + Tcl_AddErrorInfo(interp, "\""); + } + return -1; + } + + gotRW = 0; + for (i = 0; i < modeArgc; i++) { + flag = modeArgv[i]; + c = flag[0]; + if ((c == 'R') && (strcmp(flag, "RDONLY") == 0)) { + mode = (mode & ~RW_MODES) | O_RDONLY; + gotRW = 1; + } else if ((c == 'W') && (strcmp(flag, "WRONLY") == 0)) { + mode = (mode & ~RW_MODES) | O_WRONLY; + gotRW = 1; + } else if ((c == 'R') && (strcmp(flag, "RDWR") == 0)) { + mode = (mode & ~RW_MODES) | O_RDWR; + gotRW = 1; + } else if ((c == 'A') && (strcmp(flag, "APPEND") == 0)) { + mode |= O_APPEND; + *seekFlagPtr = 1; + } else if ((c == 'C') && (strcmp(flag, "CREAT") == 0)) { + mode |= O_CREAT; + } else if ((c == 'E') && (strcmp(flag, "EXCL") == 0)) { + mode |= O_EXCL; + + } else if ((c == 'N') && (strcmp(flag, "NOCTTY") == 0)) { +#ifdef O_NOCTTY + mode |= O_NOCTTY; +#else + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "access mode \"%s\" not supported by this system", + flag)); + } + ckfree(modeArgv); + return -1; +#endif + + } else if ((c == 'N') && (strcmp(flag, "NONBLOCK") == 0)) { +#ifdef O_NONBLOCK + mode |= O_NONBLOCK; +#else + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "access mode \"%s\" not supported by this system", + flag)); + } + ckfree(modeArgv); + return -1; +#endif + + } else if ((c == 'T') && (strcmp(flag, "TRUNC") == 0)) { + mode |= O_TRUNC; + } else if ((c == 'B') && (strcmp(flag, "BINARY") == 0)) { + *binaryPtr = 1; + } else { + + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "invalid access mode \"%s\": must be RDONLY, WRONLY, " + "RDWR, APPEND, BINARY, CREAT, EXCL, NOCTTY, NONBLOCK," + " or TRUNC", flag)); + } + ckfree(modeArgv); + return -1; + } + } + + ckfree(modeArgv); + + if (!gotRW) { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "access mode must include either RDONLY, WRONLY, or RDWR", + -1)); + } + return -1; + } + return mode; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSEvalFile, Tcl_FSEvalFileEx, TclNREvalFile -- + * + * Read in a file and process the entire file as one gigantic Tcl + * command. Tcl_FSEvalFile is Tcl_FSEvalFileEx without encoding argument. + * TclNREvalFile is an NRE-enabled version of Tcl_FSEvalFileEx. + * + * Results: + * A standard Tcl result, which is either the result of executing the + * file or an error indicating why the file couldn't be read. + * + * Side effects: + * Depends on the commands in the file. During the evaluation of the + * contents of the file, iPtr->scriptFile is made to point to pathPtr + * (the old value is cached and replaced when this function returns). + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSEvalFile( + Tcl_Interp *interp, /* Interpreter in which to process file. */ + Tcl_Obj *pathPtr) /* Path of file to process. Tilde-substitution + * will be performed on this name. */ +{ + return Tcl_FSEvalFileEx(interp, pathPtr, NULL); +} + +int +Tcl_FSEvalFileEx( + Tcl_Interp *interp, /* Interpreter in which to process file. */ + Tcl_Obj *pathPtr, /* Path of file to process. Tilde-substitution + * will be performed on this name. */ + const char *encodingName) /* If non-NULL, then use this encoding for the + * file. NULL means use the system encoding. */ +{ + int length, result = TCL_ERROR; + Tcl_StatBuf statBuf; + Tcl_Obj *oldScriptFile; + Interp *iPtr; + const char *string; + Tcl_Channel chan; + Tcl_Obj *objPtr; + + if (Tcl_FSGetNormalizedPath(interp, pathPtr) == NULL) { + return result; + } + + if (Tcl_FSStat(pathPtr, &statBuf) == -1) { + Tcl_SetErrno(errno); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't read file \"%s\": %s", + Tcl_GetString(pathPtr), Tcl_PosixError(interp))); + return result; + } + chan = Tcl_FSOpenFileChannel(interp, pathPtr, "r", 0644); + if (chan == NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't read file \"%s\": %s", + Tcl_GetString(pathPtr), Tcl_PosixError(interp))); + return result; + } + + /* + * The eofchar is \32 (^Z). This is the usual on Windows, but we effect + * this cross-platform to allow for scripted documents. [Bug: 2040] + */ + + Tcl_SetChannelOption(interp, chan, "-eofchar", "\32"); + + /* + * If the encoding is specified, set it for the channel. Else don't touch + * it (and use the system encoding) Report error on unknown encoding. + */ + + if (encodingName != NULL) { + if (Tcl_SetChannelOption(interp, chan, "-encoding", encodingName) + != TCL_OK) { + Tcl_Close(interp,chan); + return result; + } + } + + objPtr = Tcl_NewObj(); + Tcl_IncrRefCount(objPtr); + + /* + * Try to read first character of stream, so we can check for utf-8 BOM to + * be handled especially. + */ + + if (Tcl_ReadChars(chan, objPtr, 1, 0) < 0) { + Tcl_Close(interp, chan); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't read file \"%s\": %s", + Tcl_GetString(pathPtr), Tcl_PosixError(interp))); + goto end; + } + string = Tcl_GetString(objPtr); + + /* + * If first character is not a BOM, append the remaining characters, + * otherwise replace them. [Bug 3466099] + */ + + if (Tcl_ReadChars(chan, objPtr, -1, + memcmp(string, "\xef\xbb\xbf", 3)) < 0) { + Tcl_Close(interp, chan); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't read file \"%s\": %s", + Tcl_GetString(pathPtr), Tcl_PosixError(interp))); + goto end; + } + + if (Tcl_Close(interp, chan) != TCL_OK) { + goto end; + } + + iPtr = (Interp *) interp; + oldScriptFile = iPtr->scriptFile; + iPtr->scriptFile = pathPtr; + Tcl_IncrRefCount(iPtr->scriptFile); + string = TclGetStringFromObj(objPtr, &length); + + /* + * TIP #280 Force the evaluator to open a frame for a sourced file. + */ + + iPtr->evalFlags |= TCL_EVAL_FILE; + result = TclEvalEx(interp, string, length, 0, 1, NULL, string); + + /* + * Now we have to be careful; the script may have changed the + * iPtr->scriptFile value, so we must reset it without assuming it still + * points to 'pathPtr'. + */ + + if (iPtr->scriptFile != NULL) { + Tcl_DecrRefCount(iPtr->scriptFile); + } + iPtr->scriptFile = oldScriptFile; + + if (result == TCL_RETURN) { + result = TclUpdateReturnInfo(iPtr); + } else if (result == TCL_ERROR) { + /* + * Record information telling where the error occurred. + */ + + const char *pathString = TclGetStringFromObj(pathPtr, &length); + int limit = 150; + int overflow = (length > limit); + + Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf( + "\n (file \"%.*s%s\" line %d)", + (overflow ? limit : length), pathString, + (overflow ? "..." : ""), Tcl_GetErrorLine(interp))); + } + + end: + Tcl_DecrRefCount(objPtr); + return result; +} + +int +TclNREvalFile( + Tcl_Interp *interp, /* Interpreter in which to process file. */ + Tcl_Obj *pathPtr, /* Path of file to process. Tilde-substitution + * will be performed on this name. */ + const char *encodingName) /* If non-NULL, then use this encoding for the + * file. NULL means use the system encoding. */ +{ + Tcl_StatBuf statBuf; + Tcl_Obj *oldScriptFile, *objPtr; + Interp *iPtr; + Tcl_Channel chan; + const char *string; + + if (Tcl_FSGetNormalizedPath(interp, pathPtr) == NULL) { + return TCL_ERROR; + } + + if (Tcl_FSStat(pathPtr, &statBuf) == -1) { + Tcl_SetErrno(errno); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't read file \"%s\": %s", + Tcl_GetString(pathPtr), Tcl_PosixError(interp))); + return TCL_ERROR; + } + chan = Tcl_FSOpenFileChannel(interp, pathPtr, "r", 0644); + if (chan == NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't read file \"%s\": %s", + Tcl_GetString(pathPtr), Tcl_PosixError(interp))); + return TCL_ERROR; + } + + /* + * The eofchar is \32 (^Z). This is the usual on Windows, but we effect + * this cross-platform to allow for scripted documents. [Bug: 2040] + */ + + Tcl_SetChannelOption(interp, chan, "-eofchar", "\32"); + + /* + * If the encoding is specified, set it for the channel. Else don't touch + * it (and use the system encoding) Report error on unknown encoding. + */ + + if (encodingName != NULL) { + if (Tcl_SetChannelOption(interp, chan, "-encoding", encodingName) + != TCL_OK) { + Tcl_Close(interp,chan); + return TCL_ERROR; + } + } + + objPtr = Tcl_NewObj(); + Tcl_IncrRefCount(objPtr); + + /* + * Try to read first character of stream, so we can check for utf-8 BOM to + * be handled especially. + */ + + if (Tcl_ReadChars(chan, objPtr, 1, 0) < 0) { + Tcl_Close(interp, chan); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't read file \"%s\": %s", + Tcl_GetString(pathPtr), Tcl_PosixError(interp))); + Tcl_DecrRefCount(objPtr); + return TCL_ERROR; + } + string = Tcl_GetString(objPtr); + + /* + * If first character is not a BOM, append the remaining characters, + * otherwise replace them. [Bug 3466099] + */ + + if (Tcl_ReadChars(chan, objPtr, -1, + memcmp(string, "\xef\xbb\xbf", 3)) < 0) { + Tcl_Close(interp, chan); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't read file \"%s\": %s", + Tcl_GetString(pathPtr), Tcl_PosixError(interp))); + Tcl_DecrRefCount(objPtr); + return TCL_ERROR; + } + + if (Tcl_Close(interp, chan) != TCL_OK) { + Tcl_DecrRefCount(objPtr); + return TCL_ERROR; + } + + iPtr = (Interp *) interp; + oldScriptFile = iPtr->scriptFile; + iPtr->scriptFile = pathPtr; + Tcl_IncrRefCount(iPtr->scriptFile); + + /* + * TIP #280: Force the evaluator to open a frame for a sourced file. + */ + + iPtr->evalFlags |= TCL_EVAL_FILE; + TclNRAddCallback(interp, EvalFileCallback, oldScriptFile, pathPtr, objPtr, + NULL); + return TclNREvalObjEx(interp, objPtr, 0, NULL, INT_MIN); +} + +static int +EvalFileCallback( + ClientData data[], + Tcl_Interp *interp, + int result) +{ + Interp *iPtr = (Interp *) interp; + Tcl_Obj *oldScriptFile = data[0]; + Tcl_Obj *pathPtr = data[1]; + Tcl_Obj *objPtr = data[2]; + + /* + * Now we have to be careful; the script may have changed the + * iPtr->scriptFile value, so we must reset it without assuming it still + * points to 'pathPtr'. + */ + + if (iPtr->scriptFile != NULL) { + Tcl_DecrRefCount(iPtr->scriptFile); + } + iPtr->scriptFile = oldScriptFile; + + if (result == TCL_RETURN) { + result = TclUpdateReturnInfo(iPtr); + } else if (result == TCL_ERROR) { + /* + * Record information telling where the error occurred. + */ + + int length; + const char *pathString = TclGetStringFromObj(pathPtr, &length); + const int limit = 150; + int overflow = (length > limit); + + Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf( + "\n (file \"%.*s%s\" line %d)", + (overflow ? limit : length), pathString, + (overflow ? "..." : ""), Tcl_GetErrorLine(interp))); + } + + Tcl_DecrRefCount(objPtr); + return result; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetErrno -- + * + * Gets the current value of the Tcl error code variable. This is + * currently the global variable "errno" but could in the future change + * to something else. + * + * Results: + * The value of the Tcl error code variable. + * + * Side effects: + * None. Note that the value of the Tcl error code variable is UNDEFINED + * if a call to Tcl_SetErrno did not precede this call. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_GetErrno(void) +{ + /* + * On some platforms, errno is really a thread local (implemented by the C + * library). + */ + + return errno; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_SetErrno -- + * + * Sets the Tcl error code variable to the supplied value. On some saner + * platforms this is actually a thread-local (this is implemented in the + * C library) but this is *really* unsafe to assume! + * + * Results: + * None. + * + * Side effects: + * Modifies the value of the Tcl error code variable. + * + *---------------------------------------------------------------------- + */ + +void +Tcl_SetErrno( + int err) /* The new value. */ +{ + /* + * On some platforms, errno is really a thread local (implemented by the C + * library). + */ + + errno = err; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_PosixError -- + * + * This function is typically called after UNIX kernel calls return + * errors. It stores machine-readable information about the error in + * errorCode field of interp and returns an information string for the + * caller's use. + * + * Results: + * The return value is a human-readable string describing the error. + * + * Side effects: + * The errorCode field of the interp is set. + * + *---------------------------------------------------------------------- + */ + +const char * +Tcl_PosixError( + Tcl_Interp *interp) /* Interpreter whose errorCode field is to be + * set. */ +{ + const char *id, *msg; + + msg = Tcl_ErrnoMsg(errno); + id = Tcl_ErrnoId(); + if (interp) { + Tcl_SetErrorCode(interp, "POSIX", id, msg, NULL); + } + return msg; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSStat -- + * + * This function replaces the library version of stat and lsat. + * + * The appropriate function for the filesystem to which pathPtr belongs + * will be called. + * + * Results: + * See stat documentation. + * + * Side effects: + * See stat documentation. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSStat( + Tcl_Obj *pathPtr, /* Path of file to stat (in current CP). */ + Tcl_StatBuf *buf) /* Filled with results of stat call. */ +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr != NULL && fsPtr->statProc != NULL) { + return fsPtr->statProc(pathPtr, buf); + } + Tcl_SetErrno(ENOENT); + return -1; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSLstat -- + * + * This function replaces the library version of lstat. The appropriate + * function for the filesystem to which pathPtr belongs will be called. + * If no 'lstat' function is listed, but a 'stat' function is, then Tcl + * will fall back on the stat function. + * + * Results: + * See lstat documentation. + * + * Side effects: + * See lstat documentation. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSLstat( + Tcl_Obj *pathPtr, /* Path of file to stat (in current CP). */ + Tcl_StatBuf *buf) /* Filled with results of stat call. */ +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr != NULL) { + if (fsPtr->lstatProc != NULL) { + return fsPtr->lstatProc(pathPtr, buf); + } + if (fsPtr->statProc != NULL) { + return fsPtr->statProc(pathPtr, buf); + } + } + Tcl_SetErrno(ENOENT); + return -1; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSAccess -- + * + * This function replaces the library version of access. The appropriate + * function for the filesystem to which pathPtr belongs will be called. + * + * Results: + * See access documentation. + * + * Side effects: + * See access documentation. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSAccess( + Tcl_Obj *pathPtr, /* Path of file to access (in current CP). */ + int mode) /* Permission setting. */ +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr != NULL && fsPtr->accessProc != NULL) { + return fsPtr->accessProc(pathPtr, mode); + } + Tcl_SetErrno(ENOENT); + return -1; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSOpenFileChannel -- + * + * The appropriate function for the filesystem to which pathPtr belongs + * will be called. + * + * Results: + * The new channel or NULL, if the named file could not be opened. + * + * Side effects: + * May open the channel and may cause creation of a file on the file + * system. + * + *---------------------------------------------------------------------- + */ + +Tcl_Channel +Tcl_FSOpenFileChannel( + Tcl_Interp *interp, /* Interpreter for error reporting; can be + * NULL. */ + Tcl_Obj *pathPtr, /* Name of file to open. */ + const char *modeString, /* A list of POSIX open modes or a string such + * as "rw". */ + int permissions) /* If the open involves creating a file, with + * what modes to create it? */ +{ + const Tcl_Filesystem *fsPtr; + Tcl_Channel retVal = NULL; + + /* + * We need this just to ensure we return the correct error messages under + * some circumstances. + */ + + if (Tcl_FSGetNormalizedPath(interp, pathPtr) == NULL) { + return NULL; + } + + fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + if (fsPtr != NULL && fsPtr->openFileChannelProc != NULL) { + int mode, seekFlag, binary; + + /* + * Parse the mode, picking up whether we want to seek to start with + * and/or set the channel automatically into binary mode. + */ + + mode = TclGetOpenModeEx(interp, modeString, &seekFlag, &binary); + if (mode == -1) { + return NULL; + } + + /* + * Do the actual open() call. + */ + + retVal = fsPtr->openFileChannelProc(interp, pathPtr, mode, + permissions); + if (retVal == NULL) { + return NULL; + } + + /* + * Apply appropriate flags parsed out above. + */ + + if (seekFlag && Tcl_Seek(retVal, (Tcl_WideInt) 0, SEEK_END) + < (Tcl_WideInt) 0) { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "could not seek to end of file while opening \"%s\": %s", + Tcl_GetString(pathPtr), Tcl_PosixError(interp))); + } + Tcl_Close(NULL, retVal); + return NULL; + } + if (binary) { + Tcl_SetChannelOption(interp, retVal, "-translation", "binary"); + } + return retVal; + } + + /* + * File doesn't belong to any filesystem that can open it. + */ + + Tcl_SetErrno(ENOENT); + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't open \"%s\": %s", + Tcl_GetString(pathPtr), Tcl_PosixError(interp))); + } + return NULL; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSUtime -- + * + * This function replaces the library version of utime. The appropriate + * function for the filesystem to which pathPtr belongs will be called. + * + * Results: + * See utime documentation. + * + * Side effects: + * See utime documentation. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSUtime( + Tcl_Obj *pathPtr, /* File to change access/modification + * times. */ + struct utimbuf *tval) /* Structure containing access/modification + * times to use. Should not be modified. */ +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr != NULL && fsPtr->utimeProc != NULL) { + return fsPtr->utimeProc(pathPtr, tval); + } + /* TODO: set errno here? Tcl_SetErrno(ENOENT); */ + return -1; +} + +/* + *---------------------------------------------------------------------- + * + * NativeFileAttrStrings -- + * + * This function implements the platform dependent 'file attributes' + * subcommand, for the native filesystem, for listing the set of possible + * attribute strings. This function is part of Tcl's native filesystem + * support, and is placed here because it is shared by Unix and Windows + * code. + * + * Results: + * An array of strings + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static const char *const * +NativeFileAttrStrings( + Tcl_Obj *pathPtr, + Tcl_Obj **objPtrRef) +{ + return tclpFileAttrStrings; +} + +/* + *---------------------------------------------------------------------- + * + * NativeFileAttrsGet -- + * + * This function implements the platform dependent 'file attributes' + * subcommand, for the native filesystem, for 'get' operations. This + * function is part of Tcl's native filesystem support, and is placed + * here because it is shared by Unix and Windows code. + * + * Results: + * Standard Tcl return code. The object placed in objPtrRef (if TCL_OK + * was returned) is likely to have a refCount of zero. Either way we must + * either store it somewhere (e.g. the Tcl result), or Incr/Decr its + * refCount to ensure it is properly freed. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +NativeFileAttrsGet( + Tcl_Interp *interp, /* The interpreter for error reporting. */ + int index, /* index of the attribute command. */ + Tcl_Obj *pathPtr, /* path of file we are operating on. */ + Tcl_Obj **objPtrRef) /* for output. */ +{ + return tclpFileAttrProcs[index].getProc(interp, index, pathPtr,objPtrRef); +} + +/* + *---------------------------------------------------------------------- + * + * NativeFileAttrsSet -- + * + * This function implements the platform dependent 'file attributes' + * subcommand, for the native filesystem, for 'set' operations. This + * function is part of Tcl's native filesystem support, and is placed + * here because it is shared by Unix and Windows code. + * + * Results: + * Standard Tcl return code. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +NativeFileAttrsSet( + Tcl_Interp *interp, /* The interpreter for error reporting. */ + int index, /* index of the attribute command. */ + Tcl_Obj *pathPtr, /* path of file we are operating on. */ + Tcl_Obj *objPtr) /* set to this value. */ +{ + return tclpFileAttrProcs[index].setProc(interp, index, pathPtr, objPtr); +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSFileAttrStrings -- + * + * This function implements part of the hookable 'file attributes' + * subcommand. The appropriate function for the filesystem to which + * pathPtr belongs will be called. + * + * Results: + * The called function may either return an array of strings, or may + * instead return NULL and place a Tcl list into the given objPtrRef. + * Tcl will take that list and first increment its refCount before using + * it. On completion of that use, Tcl will decrement its refCount. Hence + * if the list should be disposed of by Tcl when done, it should have a + * refCount of zero, and if the list should not be disposed of, the + * filesystem should ensure it retains a refCount on the object. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +const char *const * +Tcl_FSFileAttrStrings( + Tcl_Obj *pathPtr, + Tcl_Obj **objPtrRef) +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr != NULL && fsPtr->fileAttrStringsProc != NULL) { + return fsPtr->fileAttrStringsProc(pathPtr, objPtrRef); + } + Tcl_SetErrno(ENOENT); + return NULL; +} + +/* + *---------------------------------------------------------------------- + * + * TclFSFileAttrIndex -- + * + * Helper function for converting an attribute name to an index into the + * attribute table. + * + * Results: + * Tcl result code, index written to *indexPtr on result==TCL_OK + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +TclFSFileAttrIndex( + Tcl_Obj *pathPtr, /* File whose attributes are to be indexed + * into. */ + const char *attributeName, /* The attribute being looked for. */ + int *indexPtr) /* Where to write the found index. */ +{ + Tcl_Obj *listObj = NULL; + const char *const *attrTable; + + /* + * Get the attribute table for the file. + */ + + attrTable = Tcl_FSFileAttrStrings(pathPtr, &listObj); + if (listObj != NULL) { + Tcl_IncrRefCount(listObj); + } + + if (attrTable != NULL) { + /* + * It's a constant attribute table, so use T_GIFO. + */ + + Tcl_Obj *tmpObj = Tcl_NewStringObj(attributeName, -1); + int result; + + result = Tcl_GetIndexFromObj(NULL, tmpObj, attrTable, NULL, TCL_EXACT, + indexPtr); + TclDecrRefCount(tmpObj); + if (listObj != NULL) { + TclDecrRefCount(listObj); + } + return result; + } else if (listObj != NULL) { + /* + * It's a non-constant attribute list, so do a literal search. + */ + + int i, objc; + Tcl_Obj **objv; + + if (Tcl_ListObjGetElements(NULL, listObj, &objc, &objv) != TCL_OK) { + TclDecrRefCount(listObj); + return TCL_ERROR; + } + for (i=0 ; i<objc ; i++) { + if (!strcmp(attributeName, TclGetString(objv[i]))) { + TclDecrRefCount(listObj); + *indexPtr = i; + return TCL_OK; + } + } + TclDecrRefCount(listObj); + return TCL_ERROR; + } else { + return TCL_ERROR; + } +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSFileAttrsGet -- + * + * This function implements read access for the hookable 'file + * attributes' subcommand. The appropriate function for the filesystem to + * which pathPtr belongs will be called. + * + * Results: + * Standard Tcl return code. The object placed in objPtrRef (if TCL_OK + * was returned) is likely to have a refCount of zero. Either way we must + * either store it somewhere (e.g. the Tcl result), or Incr/Decr its + * refCount to ensure it is properly freed. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSFileAttrsGet( + Tcl_Interp *interp, /* The interpreter for error reporting. */ + int index, /* index of the attribute command. */ + Tcl_Obj *pathPtr, /* filename we are operating on. */ + Tcl_Obj **objPtrRef) /* for output. */ +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr != NULL && fsPtr->fileAttrsGetProc != NULL) { + return fsPtr->fileAttrsGetProc(interp, index, pathPtr, objPtrRef); + } + Tcl_SetErrno(ENOENT); + return -1; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSFileAttrsSet -- + * + * This function implements write access for the hookable 'file + * attributes' subcommand. The appropriate function for the filesystem to + * which pathPtr belongs will be called. + * + * Results: + * Standard Tcl return code. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSFileAttrsSet( + Tcl_Interp *interp, /* The interpreter for error reporting. */ + int index, /* index of the attribute command. */ + Tcl_Obj *pathPtr, /* filename we are operating on. */ + Tcl_Obj *objPtr) /* Input value. */ +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr != NULL && fsPtr->fileAttrsSetProc != NULL) { + return fsPtr->fileAttrsSetProc(interp, index, pathPtr, objPtr); + } + Tcl_SetErrno(ENOENT); + return -1; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSGetCwd -- + * + * This function replaces the library version of getcwd(). + * + * Most VFS's will *not* implement a 'cwdProc'. Tcl now maintains its own + * record (in a Tcl_Obj) of the cwd, and an attempt is made to synch this + * with the cwd's containing filesystem, if that filesystem provides a + * cwdProc (e.g. the native filesystem). + * + * Note that if Tcl's cwd is not in the native filesystem, then of course + * Tcl's cwd and the native cwd are different: extensions should + * therefore ensure they only access the cwd through this function to + * avoid confusion. + * + * If a global cwdPathPtr already exists, it is cached in the thread's + * private data structures and reference to the cached copy is returned, + * subject to a synchronisation attempt in that cwdPathPtr's fs. + * + * Otherwise, the chain of functions that have been "inserted" into the + * filesystem will be called in succession until either a value other + * than NULL is returned, or the entire list is visited. + * + * Results: + * The result is a pointer to a Tcl_Obj specifying the current directory, + * or NULL if the current directory could not be determined. If NULL is + * returned, an error message is left in the interp's result. + * + * The result already has its refCount incremented for the caller. When + * it is no longer needed, that refCount should be decremented. + * + * Side effects: + * Various objects may be freed and allocated. + * + *---------------------------------------------------------------------- + */ + +Tcl_Obj * +Tcl_FSGetCwd( + Tcl_Interp *interp) +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); + + if (TclFSCwdPointerEquals(NULL)) { + FilesystemRecord *fsRecPtr; + Tcl_Obj *retVal = NULL; + + /* + * We've never been called before, try to find a cwd. Call each of the + * "Tcl_GetCwd" function in succession. A non-NULL return value + * indicates the particular function has succeeded. + */ + + fsRecPtr = FsGetFirstFilesystem(); + Claim(); + for (; (retVal == NULL) && (fsRecPtr != NULL); + fsRecPtr = fsRecPtr->nextPtr) { + ClientData retCd; + TclFSGetCwdProc2 *proc2; + if (fsRecPtr->fsPtr->getCwdProc == NULL) { + continue; + } + + if (fsRecPtr->fsPtr->version == TCL_FILESYSTEM_VERSION_1) { + retVal = fsRecPtr->fsPtr->getCwdProc(interp); + continue; + } + + proc2 = (TclFSGetCwdProc2 *) fsRecPtr->fsPtr->getCwdProc; + retCd = proc2(NULL); + if (retCd != NULL) { + Tcl_Obj *norm; + + /* + * Looks like a new current directory. + */ + + retVal = fsRecPtr->fsPtr->internalToNormalizedProc(retCd); + Tcl_IncrRefCount(retVal); + norm = TclFSNormalizeAbsolutePath(interp,retVal); + if (norm != NULL) { + /* + * We found a cwd, which is now in our global storage. We + * must make a copy. Norm already has a refCount of 1. + * + * Threading issue: note that multiple threads at system + * startup could in principle call this function + * simultaneously. They will therefore each set the + * cwdPathPtr independently. That behaviour is a bit + * peculiar, but should be fine. Once we have a cwd, we'll + * always be in the 'else' branch below which is simpler. + */ + + FsUpdateCwd(norm, retCd); + Tcl_DecrRefCount(norm); + } else { + fsRecPtr->fsPtr->freeInternalRepProc(retCd); + } + Tcl_DecrRefCount(retVal); + retVal = NULL; + Disclaim(); + goto cdDidNotChange; + } else if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "error getting working directory name: %s", + Tcl_PosixError(interp))); + } + } + Disclaim(); + + /* + * Now the 'cwd' may NOT be normalized, at least on some platforms. + * For the sake of efficiency, we want a completely normalized cwd at + * all times. + * + * Finally, if retVal is NULL, we do not have a cwd, which could be + * problematic. + */ + + if (retVal != NULL) { + Tcl_Obj *norm = TclFSNormalizeAbsolutePath(interp, retVal); + + if (norm != NULL) { + /* + * We found a cwd, which is now in our global storage. We must + * make a copy. Norm already has a refCount of 1. + * + * Threading issue: note that multiple threads at system + * startup could in principle call this function + * simultaneously. They will therefore each set the cwdPathPtr + * independently. That behaviour is a bit peculiar, but should + * be fine. Once we have a cwd, we'll always be in the 'else' + * branch below which is simpler. + */ + + ClientData cd = (ClientData) Tcl_FSGetNativePath(norm); + + FsUpdateCwd(norm, TclNativeDupInternalRep(cd)); + Tcl_DecrRefCount(norm); + } + Tcl_DecrRefCount(retVal); + } + } else { + /* + * We already have a cwd cached, but we want to give the filesystem it + * is in a chance to check whether that cwd has changed, or is perhaps + * no longer accessible. This allows an error to be thrown if, say, + * the permissions on that directory have changed. + */ + + const Tcl_Filesystem *fsPtr = + Tcl_FSGetFileSystemForPath(tsdPtr->cwdPathPtr); + ClientData retCd = NULL; + Tcl_Obj *retVal, *norm; + + /* + * If the filesystem couldn't be found, or if no cwd function exists + * for this filesystem, then we simply assume the cached cwd is ok. + * If we do call a cwd, we must watch for errors (if the cwd returns + * NULL). This ensures that, say, on Unix if the permissions of the + * cwd change, 'pwd' does actually throw the correct error in Tcl. + * (This is tested for in the test suite on unix). + */ + + if (fsPtr == NULL || fsPtr->getCwdProc == NULL) { + goto cdDidNotChange; + } + + if (fsPtr->version == TCL_FILESYSTEM_VERSION_1) { + retVal = fsPtr->getCwdProc(interp); + } else { + /* + * New API. + */ + + TclFSGetCwdProc2 *proc2 = (TclFSGetCwdProc2 *) fsPtr->getCwdProc; + + retCd = proc2(tsdPtr->cwdClientData); + if (retCd == NULL && interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "error getting working directory name: %s", + Tcl_PosixError(interp))); + } + + if (retCd == tsdPtr->cwdClientData) { + goto cdDidNotChange; + } + + /* + * Looks like a new current directory. + */ + + retVal = fsPtr->internalToNormalizedProc(retCd); + Tcl_IncrRefCount(retVal); + } + + /* + * Check if the 'cwd' function returned an error; if so, reset the + * cwd. + */ + + if (retVal == NULL) { + FsUpdateCwd(NULL, NULL); + goto cdDidNotChange; + } + + /* + * Normalize the path. + */ + + norm = TclFSNormalizeAbsolutePath(interp, retVal); + + /* + * Check whether cwd has changed from the value previously stored in + * cwdPathPtr. Really 'norm' shouldn't be NULL, but we are careful. + */ + + if (norm == NULL) { + /* Do nothing */ + if (retCd != NULL) { + fsPtr->freeInternalRepProc(retCd); + } + } else if (norm == tsdPtr->cwdPathPtr) { + goto cdEqual; + } else { + /* + * Note that both 'norm' and 'tsdPtr->cwdPathPtr' are normalized + * paths. Therefore we can be more efficient than calling + * 'Tcl_FSEqualPaths', and in addition avoid a nasty infinite loop + * bug when trying to normalize tsdPtr->cwdPathPtr. + */ + + int len1, len2; + const char *str1, *str2; + + str1 = TclGetStringFromObj(tsdPtr->cwdPathPtr, &len1); + str2 = TclGetStringFromObj(norm, &len2); + if ((len1 == len2) && (strcmp(str1, str2) == 0)) { + /* + * If the paths were equal, we can be more efficient and + * retain the old path object which will probably already be + * shared. In this case we can simply free the normalized path + * we just calculated. + */ + + cdEqual: + Tcl_DecrRefCount(norm); + if (retCd != NULL) { + fsPtr->freeInternalRepProc(retCd); + } + } else { + FsUpdateCwd(norm, retCd); + Tcl_DecrRefCount(norm); + } + } + Tcl_DecrRefCount(retVal); + } + + cdDidNotChange: + if (tsdPtr->cwdPathPtr != NULL) { + Tcl_IncrRefCount(tsdPtr->cwdPathPtr); + } + + return tsdPtr->cwdPathPtr; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSChdir -- + * + * This function replaces the library version of chdir(). + * + * The path is normalized and then passed to the filesystem which claims + * it. + * + * Results: + * See chdir() documentation. If successful, we keep a record of the + * successful path in cwdPathPtr for subsequent calls to getcwd. + * + * Side effects: + * See chdir() documentation. The global cwdPathPtr may change value. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSChdir( + Tcl_Obj *pathPtr) +{ + const Tcl_Filesystem *fsPtr, *oldFsPtr = NULL; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); + int retVal = -1; + + if (tsdPtr->cwdPathPtr != NULL) { + oldFsPtr = Tcl_FSGetFileSystemForPath(tsdPtr->cwdPathPtr); + } + if (Tcl_FSGetNormalizedPath(NULL, pathPtr) == NULL) { + Tcl_SetErrno(ENOENT); + return retVal; + } + + fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + if (fsPtr != NULL) { + if (fsPtr->chdirProc != NULL) { + /* + * If this fails, an appropriate errno will have been stored using + * 'Tcl_SetErrno()'. + */ + + retVal = fsPtr->chdirProc(pathPtr); + } else { + /* + * Fallback on stat-based implementation. + */ + + Tcl_StatBuf buf; + + /* + * If the file can be stat'ed and is a directory and is readable, + * then we can chdir. If any of these actions fail, then + * 'Tcl_SetErrno()' should automatically have been called to set + * an appropriate error code. + */ + + if ((Tcl_FSStat(pathPtr, &buf) == 0) && (S_ISDIR(buf.st_mode)) + && (Tcl_FSAccess(pathPtr, R_OK) == 0)) { + /* + * We allow the chdir. + */ + + retVal = 0; + } + } + } else { + Tcl_SetErrno(ENOENT); + } + + /* + * The cwd changed, or an error was thrown. If an error was thrown, we can + * just continue (and that will report the error to the user). If there + * was no error we must assume that the cwd was actually changed to the + * normalized value we calculated above, and we must therefore cache that + * information. + * + * If the filesystem in question has a getCwdProc, then the correct logic + * which performs the part below is already part of the Tcl_FSGetCwd() + * call, so no need to replicate it again. This will have a side effect + * though. The private authoritative representation of the current working + * directory stored in cwdPathPtr in static memory will be out-of-sync + * with the real OS-maintained value. The first call to Tcl_FSGetCwd will + * however recalculate the private copy to match the OS-value so + * everything will work right. + * + * However, if there is no getCwdProc, then we _must_ update our private + * storage of the cwd, since this is the only opportunity to do that! + * + * Note: We currently call this block of code irrespective of whether + * there was a getCwdProc or not, but the code should all in principle + * work if we only call this block if fsPtr->getCwdProc == NULL. + */ + + if (retVal == 0) { + /* + * Note that this normalized path may be different to what we found + * above (or at least a different object), if the filesystem epoch + * changed recently. This can actually happen with scripted documents + * very easily. Therefore we ask for the normalized path again (the + * correct value will have been cached as a result of the + * Tcl_FSGetFileSystemForPath call above anyway). + */ + + Tcl_Obj *normDirName = Tcl_FSGetNormalizedPath(NULL, pathPtr); + + if (normDirName == NULL) { + /* Not really true, but what else to do? */ + Tcl_SetErrno(ENOENT); + return -1; + } + + if (fsPtr == &tclNativeFilesystem) { + /* + * For the native filesystem, we keep a cache of the native + * representation of the cwd. But, we want to do that for the + * exact format that is returned by 'getcwd' (so that we can later + * compare the two representations for equality), which might not + * be exactly the same char-string as the native representation of + * the fully normalized path (e.g. on Windows there's a + * forward-slash vs backslash difference). Hence we ask for this + * again here. On Unix it might actually be true that we always + * have the correct form in the native rep in which case we could + * simply use: + * cd = Tcl_FSGetNativePath(pathPtr); + * instead. This should be examined by someone on Unix. + */ + + ClientData cd; + ClientData oldcd = tsdPtr->cwdClientData; + + /* + * Assumption we are using a filesystem version 2. + */ + + TclFSGetCwdProc2 *proc2 = (TclFSGetCwdProc2 *) fsPtr->getCwdProc; + + cd = proc2(oldcd); + if (cd != oldcd) { + FsUpdateCwd(normDirName, cd); + } + } else { + FsUpdateCwd(normDirName, NULL); + } + + /* + * If the filesystem changed between old and new cwd + * force filesystem refresh on path objects. + */ + if (oldFsPtr != NULL && fsPtr != oldFsPtr) { + Tcl_FSMountsChanged(NULL); + } + } + + return retVal; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSLoadFile -- + * + * Dynamically loads a binary code file into memory and returns the + * addresses of two functions within that file, if they are defined. The + * appropriate function for the filesystem to which pathPtr belongs will + * be called. + * + * Note that the native filesystem doesn't actually assume 'pathPtr' is a + * path. Rather it assumes pathPtr is either a path or just the name + * (tail) of a file which can be found somewhere in the environment's + * loadable path. This behaviour is not very compatible with virtual + * filesystems (and has other problems documented in the load man-page), + * so it is advised that full paths are always used. + * + * Results: + * A standard Tcl completion code. If an error occurs, an error message + * is left in the interp's result. + * + * Side effects: + * New code suddenly appears in memory. This may later be unloaded by + * passing the clientData to the unloadProc. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSLoadFile( + Tcl_Interp *interp, /* Used for error reporting. */ + Tcl_Obj *pathPtr, /* Name of the file containing the desired + * code. */ + const char *sym1, const char *sym2, + /* Names of two functions to look up in the + * file's symbol table. */ + Tcl_PackageInitProc **proc1Ptr, Tcl_PackageInitProc **proc2Ptr, + /* Where to return the addresses corresponding + * to sym1 and sym2. */ + Tcl_LoadHandle *handlePtr, /* Filled with token for dynamically loaded + * file which will be passed back to + * (*unloadProcPtr)() to unload the file. */ + Tcl_FSUnloadFileProc **unloadProcPtr) + /* Filled with address of Tcl_FSUnloadFileProc + * function which should be used for this + * file. */ +{ + const char *symbols[3]; + void *procPtrs[2]; + int res; + + /* + * Initialize the arrays. + */ + + symbols[0] = sym1; + symbols[1] = sym2; + symbols[2] = NULL; + + /* + * Perform the load. + */ + + res = Tcl_LoadFile(interp, pathPtr, symbols, 0, procPtrs, handlePtr); + if (res == TCL_OK) { + *proc1Ptr = (Tcl_PackageInitProc *) procPtrs[0]; + *proc2Ptr = (Tcl_PackageInitProc *) procPtrs[1]; + } else { + *proc1Ptr = *proc2Ptr = NULL; + } + + return res; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_LoadFile -- + * + * Dynamically loads a binary code file into memory and returns the + * addresses of a number of given functions within that file, if they are + * defined. The appropriate function for the filesystem to which pathPtr + * belongs will be called. + * + * Note that the native filesystem doesn't actually assume 'pathPtr' is a + * path. Rather it assumes pathPtr is either a path or just the name + * (tail) of a file which can be found somewhere in the environment's + * loadable path. This behaviour is not very compatible with virtual + * filesystems (and has other problems documented in the load man-page), + * so it is advised that full paths are always used. + * + * Results: + * A standard Tcl completion code. If an error occurs, an error message + * is left in the interp's result. + * + * Side effects: + * New code suddenly appears in memory. This may later be unloaded by + * calling TclFS_UnloadFile. + * + *---------------------------------------------------------------------- + */ + +/* + * Workaround for issue with modern HPUX which do allow the unlink (no ETXTBSY + * error) yet somehow trash some internal data structures which prevents the + * second and further shared libraries from getting properly loaded. Only the + * first is ok. We try to get around the issue by not unlinking, + * i.e. emulating the behaviour of the older HPUX which denied removal. + * + * Doing the unlink is also an issue within docker containers, whose AUFS + * bungles this as well, see + * https://github.com/dotcloud/docker/issues/1911 + * + * For these situations the change below makes the execution of the unlink + * semi-controllable at runtime. + * + * An AUFS filesystem (if it can be detected) will force avoidance of + * unlink. The env variable TCL_TEMPLOAD_NO_UNLINK allows detection of a + * users general request (unlink and not. + * + * By default the unlink is done (if not in AUFS). However if the variable is + * present and set to true (any integer > 0) then the unlink is skipped. + */ + +int +TclSkipUnlink (Tcl_Obj* shlibFile) +{ + /* Order of testing: + * 1. On hpux we generally want to skip unlink in general + * + * Outside of hpux then: + * 2. For a general user request (TCL_TEMPLOAD_NO_UNLINK present, non-empty, => int) + * 3. For general AUFS environment (statfs, if available). + * + * Ad 2: This variable can disable/override the AUFS detection, i.e. for + * testing if a newer AUFS does not have the bug any more. + * + * Ad 3: This is conditionally compiled in. Condition currently must be set manually. + * This part needs proper tests in the configure(.in). + */ + +#ifdef hpux + return 1; +#else + char* skipstr; + + skipstr = getenv ("TCL_TEMPLOAD_NO_UNLINK"); + if (skipstr && (skipstr[0] != '\0')) { + return atoi(skipstr); + } + +#ifdef TCL_TEMPLOAD_NO_UNLINK +#ifndef NO_FSTATFS + { + struct statfs fs; + /* Have fstatfs. May not have the AUFS super magic ... Indeed our build + * box is too old to have it directly in the headers. Define taken from + * http://mooon.googlecode.com/svn/trunk/linux_include/linux/aufs_type.h + * http://aufs.sourceforge.net/ + * Better reference will be gladly taken. + */ +#ifndef AUFS_SUPER_MAGIC +#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's') +#endif /* AUFS_SUPER_MAGIC */ + if ((statfs(Tcl_GetString (shlibFile), &fs) == 0) && + (fs.f_type == AUFS_SUPER_MAGIC)) { + return 1; + } + } +#endif /* ... NO_FSTATFS */ +#endif /* ... TCL_TEMPLOAD_NO_UNLINK */ + + /* Fallback: !hpux, no EV override, no AUFS (detection, nor detected): + * Don't skip */ + return 0; +#endif /* hpux */ +} + +int +Tcl_LoadFile( + Tcl_Interp *interp, /* Used for error reporting. */ + Tcl_Obj *pathPtr, /* Name of the file containing the desired + * code. */ + const char *const symbols[],/* Names of functions to look up in the file's + * symbol table. */ + int flags, /* Flags */ + void *procVPtrs, /* Where to return the addresses corresponding + * to symbols[]. */ + Tcl_LoadHandle *handlePtr) /* Filled with token for shared library + * information which can be used in + * TclpFindSymbol. */ +{ + void **procPtrs = (void **) procVPtrs; + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + const Tcl_Filesystem *copyFsPtr; + Tcl_FSUnloadFileProc *unloadProcPtr; + Tcl_Obj *copyToPtr; + Tcl_LoadHandle newLoadHandle = NULL; + Tcl_LoadHandle divertedLoadHandle = NULL; + Tcl_FSUnloadFileProc *newUnloadProcPtr = NULL; + FsDivertLoad *tvdlPtr; + int retVal; + int i; + + if (fsPtr == NULL) { + Tcl_SetErrno(ENOENT); + return TCL_ERROR; + } + + if (fsPtr->loadFileProc != NULL) { + int retVal = ((Tcl_FSLoadFileProc2 *)(fsPtr->loadFileProc)) + (interp, pathPtr, handlePtr, &unloadProcPtr, flags); + + if (retVal == TCL_OK) { + if (*handlePtr == NULL) { + return TCL_ERROR; + } + if (interp) { + Tcl_ResetResult(interp); + } + goto resolveSymbols; + } + if (Tcl_GetErrno() != EXDEV) { + return retVal; + } + } + + /* + * The filesystem doesn't support 'load', so we fall back on the following + * technique: + * + * First check if it is readable -- and exists! + */ + + if (Tcl_FSAccess(pathPtr, R_OK) != 0) { + if (interp) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't load library \"%s\": %s", + Tcl_GetString(pathPtr), Tcl_PosixError(interp))); + } + return TCL_ERROR; + } + +#ifdef TCL_LOAD_FROM_MEMORY + /* + * The platform supports loading code from memory, so ask for a buffer of + * the appropriate size, read the file into it and load the code from the + * buffer: + */ + + { + int ret, size; + void *buffer; + Tcl_StatBuf statBuf; + Tcl_Channel data; + + ret = Tcl_FSStat(pathPtr, &statBuf); + if (ret < 0) { + goto mustCopyToTempAnyway; + } + size = (int) statBuf.st_size; + + /* + * Tcl_Read takes an int: check that file size isn't wide. + */ + + if (size != (Tcl_WideInt) statBuf.st_size) { + goto mustCopyToTempAnyway; + } + data = Tcl_FSOpenFileChannel(interp, pathPtr, "rb", 0666); + if (!data) { + goto mustCopyToTempAnyway; + } + buffer = TclpLoadMemoryGetBuffer(interp, size); + if (!buffer) { + Tcl_Close(interp, data); + goto mustCopyToTempAnyway; + } + ret = Tcl_Read(data, buffer, size); + Tcl_Close(interp, data); + ret = TclpLoadMemory(interp, buffer, size, ret, handlePtr, + &unloadProcPtr, flags); + if (ret == TCL_OK && *handlePtr != NULL) { + goto resolveSymbols; + } + } + + mustCopyToTempAnyway: + if (interp) { + Tcl_ResetResult(interp); + } +#endif /* TCL_LOAD_FROM_MEMORY */ + + /* + * Get a temporary filename to use, first to copy the file into, and then + * to load. + */ + + copyToPtr = TclpTempFileNameForLibrary(interp, pathPtr); + if (copyToPtr == NULL) { + return TCL_ERROR; + } + Tcl_IncrRefCount(copyToPtr); + + copyFsPtr = Tcl_FSGetFileSystemForPath(copyToPtr); + if ((copyFsPtr == NULL) || (copyFsPtr == fsPtr)) { + /* + * We already know we can't use Tcl_FSLoadFile from this filesystem, + * and we must avoid a possible infinite loop. Try to delete the file + * we probably created, and then exit. + */ + + Tcl_FSDeleteFile(copyToPtr); + Tcl_DecrRefCount(copyToPtr); + if (interp) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "couldn't load from current filesystem", -1)); + } + return TCL_ERROR; + } + + if (TclCrossFilesystemCopy(interp, pathPtr, copyToPtr) != TCL_OK) { + /* + * Cross-platform copy failed. + */ + + Tcl_FSDeleteFile(copyToPtr); + Tcl_DecrRefCount(copyToPtr); + return TCL_ERROR; + } + +#ifndef _WIN32 + /* + * Do we need to set appropriate permissions on the file? This may be + * required on some systems. On Unix we could loop over the file + * attributes, and set any that are called "-permissions" to 0700. However + * we just do this directly, like this: + */ + + { + int index; + Tcl_Obj *perm; + + TclNewLiteralStringObj(perm, "0700"); + Tcl_IncrRefCount(perm); + if (TclFSFileAttrIndex(copyToPtr, "-permissions", &index) == TCL_OK) { + Tcl_FSFileAttrsSet(NULL, index, copyToPtr, perm); + } + Tcl_DecrRefCount(perm); + } +#endif + + /* + * We need to reset the result now, because the cross-filesystem copy may + * have stored the number of bytes in the result. + */ + + if (interp) { + Tcl_ResetResult(interp); + } + + retVal = Tcl_LoadFile(interp, copyToPtr, symbols, flags, procPtrs, + &newLoadHandle); + if (retVal != TCL_OK) { + /* + * The file didn't load successfully. + */ + + Tcl_FSDeleteFile(copyToPtr); + Tcl_DecrRefCount(copyToPtr); + return retVal; + } + + /* + * Try to delete the file immediately - this is possible in some OSes, and + * avoids any worries about leaving the copy laying around on exit. + */ + + if ( + !TclSkipUnlink (copyToPtr) && + (Tcl_FSDeleteFile(copyToPtr) == TCL_OK)) { + Tcl_DecrRefCount(copyToPtr); + + /* + * We tell our caller about the real shared library which was loaded. + * Note that this does mean that the package list maintained by 'load' + * will store the original (vfs) path alongside the temporary load + * handle and unload proc ptr. + */ + + *handlePtr = newLoadHandle; + if (interp) { + Tcl_ResetResult(interp); + } + return TCL_OK; + } + + /* + * When we unload this file, we need to divert the unloading so we can + * unload and cleanup the temporary file correctly. + */ + + tvdlPtr = ckalloc(sizeof(FsDivertLoad)); + + /* + * Remember three pieces of information. This allows us to cleanup the + * diverted load completely, on platforms which allow proper unloading of + * code. + */ + + tvdlPtr->loadHandle = newLoadHandle; + tvdlPtr->unloadProcPtr = newUnloadProcPtr; + + if (copyFsPtr != &tclNativeFilesystem) { + /* + * copyToPtr is already incremented for this reference. + */ + + tvdlPtr->divertedFile = copyToPtr; + + /* + * This is the filesystem we loaded it into. Since we have a reference + * to 'copyToPtr', we already have a refCount on this filesystem, so + * we don't need to worry about it disappearing on us. + */ + + tvdlPtr->divertedFilesystem = copyFsPtr; + tvdlPtr->divertedFileNativeRep = NULL; + } else { + /* + * We need the native rep. + */ + + tvdlPtr->divertedFileNativeRep = TclNativeDupInternalRep( + Tcl_FSGetInternalRep(copyToPtr, copyFsPtr)); + + /* + * We don't need or want references to the copied Tcl_Obj or the + * filesystem if it is the native one. + */ + + tvdlPtr->divertedFile = NULL; + tvdlPtr->divertedFilesystem = NULL; + Tcl_DecrRefCount(copyToPtr); + } + + copyToPtr = NULL; + + divertedLoadHandle = ckalloc(sizeof(struct Tcl_LoadHandle_)); + divertedLoadHandle->clientData = tvdlPtr; + divertedLoadHandle->findSymbolProcPtr = DivertFindSymbol; + divertedLoadHandle->unloadFileProcPtr = DivertUnloadFile; + *handlePtr = divertedLoadHandle; + + if (interp) { + Tcl_ResetResult(interp); + } + return retVal; + + resolveSymbols: + /* + * At this point, *handlePtr is already set up to the handle for the + * loaded library. We now try to resolve the symbols. + */ + + if (symbols != NULL) { + for (i=0 ; symbols[i] != NULL; i++) { + procPtrs[i] = Tcl_FindSymbol(interp, *handlePtr, symbols[i]); + if (procPtrs[i] == NULL) { + /* + * At least one symbol in the list was not found. Unload the + * file, and report the problem back to the caller. + * (Tcl_FindSymbol should already have left an appropriate + * error message.) + */ + + (*handlePtr)->unloadFileProcPtr(*handlePtr); + *handlePtr = NULL; + return TCL_ERROR; + } + } + } + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * DivertFindSymbol -- + * + * Find a symbol in a shared library loaded by copy-from-VFS. + * + *---------------------------------------------------------------------- + */ + +static void * +DivertFindSymbol( + Tcl_Interp *interp, /* Tcl interpreter */ + Tcl_LoadHandle loadHandle, /* Handle to the diverted module */ + const char *symbol) /* Symbol to resolve */ +{ + FsDivertLoad *tvdlPtr = (FsDivertLoad *) loadHandle->clientData; + Tcl_LoadHandle originalHandle = tvdlPtr->loadHandle; + + return originalHandle->findSymbolProcPtr(interp, originalHandle, symbol); +} + +/* + *---------------------------------------------------------------------- + * + * DivertUnloadFile -- + * + * Unloads a file that has been loaded by copying from VFS to the native + * filesystem. + * + * Parameters: + * loadHandle -- Handle of the file to unload + * + *---------------------------------------------------------------------- + */ + +static void +DivertUnloadFile( + Tcl_LoadHandle loadHandle) +{ + FsDivertLoad *tvdlPtr = (FsDivertLoad *) loadHandle->clientData; + Tcl_LoadHandle originalHandle; + + /* + * This test should never trigger, since we give the client data in the + * function above. + */ + + if (tvdlPtr == NULL) { + return; + } + originalHandle = tvdlPtr->loadHandle; + + /* + * Call the real 'unloadfile' proc we actually used. It is very important + * that we call this first, so that the shared library is actually + * unloaded by the OS. Otherwise, the following 'delete' may well fail + * because the shared library is still in use. + */ + + originalHandle->unloadFileProcPtr(originalHandle); + + /* + * What filesystem contains the temp copy of the library? + */ + + if (tvdlPtr->divertedFilesystem == NULL) { + /* + * It was the native filesystem, and we have a special function + * available just for this purpose, which we know works even at this + * late stage. + */ + + TclpDeleteFile(tvdlPtr->divertedFileNativeRep); + NativeFreeInternalRep(tvdlPtr->divertedFileNativeRep); + } else { + /* + * Remove the temporary file we created. Note, we may crash here + * because encodings have been taken down already. + */ + + if (tvdlPtr->divertedFilesystem->deleteFileProc(tvdlPtr->divertedFile) + != TCL_OK) { + /* + * The above may have failed because the filesystem, or something + * it depends upon (e.g. encodings) have been taken down because + * Tcl is exiting. + * + * We may need to work out how to delete this file more robustly + * (or give the filesystem the information it needs to delete the + * file more robustly). + * + * In particular, one problem might be that the filesystem cannot + * extract the information it needs from the above path object + * because Tcl's entire filesystem apparatus (the code in this + * file) has been finalized, and it refuses to pass the internal + * representation to the filesystem. + */ + } + + /* + * And free up the allocations. This will also of course remove a + * refCount from the Tcl_Filesystem to which this file belongs, which + * could then free up the filesystem if we are exiting. + */ + + Tcl_DecrRefCount(tvdlPtr->divertedFile); + } + + ckfree(tvdlPtr); + ckfree(loadHandle); +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FindSymbol -- + * + * Find a symbol in a loaded library + * + * Results: + * Returns a pointer to the symbol if found. If not found, returns NULL + * and leaves an error message in the interpreter result. + * + * This function was once filesystem-specific, but has been made portable by + * having TclpDlopen return a structure that includes procedure pointers. + * + *---------------------------------------------------------------------- + */ + +void * +Tcl_FindSymbol( + Tcl_Interp *interp, /* Tcl interpreter */ + Tcl_LoadHandle loadHandle, /* Handle to the loaded library */ + const char *symbol) /* Name of the symbol to resolve */ +{ + return loadHandle->findSymbolProcPtr(interp, loadHandle, symbol); +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FSUnloadFile -- + * + * Unloads a library given its handle. Checks first that the library + * supports unloading. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_FSUnloadFile( + Tcl_Interp *interp, /* Tcl interpreter */ + Tcl_LoadHandle handle) /* Handle of the file to unload */ +{ + if (handle->unloadFileProcPtr == NULL) { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "cannot unload: filesystem does not support unloading", + -1)); + } + return TCL_ERROR; + } + TclpUnloadFile(handle); + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * TclpUnloadFile -- + * + * Unloads a library given its handle + * + * This function was once filesystem-specific, but has been made portable by + * having TclpDlopen return a structure that includes procedure pointers. + * + *---------------------------------------------------------------------- + */ + +void +TclpUnloadFile( + Tcl_LoadHandle handle) +{ + if (handle->unloadFileProcPtr != NULL) { + handle->unloadFileProcPtr(handle); + } +} + +/* + *---------------------------------------------------------------------- + * + * TclFSUnloadTempFile -- + * + * This function is called when we loaded a library of code via an + * intermediate temporary file. This function ensures the library is + * correctly unloaded and the temporary file is correctly deleted. + * + * Results: + * None. + * + * Side effects: + * The effects of the 'unload' function called, and of course the + * temporary file will be deleted. + * + *---------------------------------------------------------------------- + */ + +void +TclFSUnloadTempFile( + Tcl_LoadHandle loadHandle) /* loadHandle returned by a previous call to + * Tcl_FSLoadFile(). The loadHandle is a token + * that represents the loaded file. */ +{ + FsDivertLoad *tvdlPtr = (FsDivertLoad *) loadHandle; + + /* + * This test should never trigger, since we give the client data in the + * function above. + */ + + if (tvdlPtr == NULL) { + return; + } + + /* + * Call the real 'unloadfile' proc we actually used. It is very important + * that we call this first, so that the shared library is actually + * unloaded by the OS. Otherwise, the following 'delete' may well fail + * because the shared library is still in use. + */ + + if (tvdlPtr->unloadProcPtr != NULL) { + tvdlPtr->unloadProcPtr(tvdlPtr->loadHandle); + } + + if (tvdlPtr->divertedFilesystem == NULL) { + /* + * It was the native filesystem, and we have a special function + * available just for this purpose, which we know works even at this + * late stage. + */ + + TclpDeleteFile(tvdlPtr->divertedFileNativeRep); + NativeFreeInternalRep(tvdlPtr->divertedFileNativeRep); + } else { + /* + * Remove the temporary file we created. Note, we may crash here + * because encodings have been taken down already. + */ + + if (tvdlPtr->divertedFilesystem->deleteFileProc(tvdlPtr->divertedFile) + != TCL_OK) { + /* + * The above may have failed because the filesystem, or something + * it depends upon (e.g. encodings) have been taken down because + * Tcl is exiting. + * + * We may need to work out how to delete this file more robustly + * (or give the filesystem the information it needs to delete the + * file more robustly). + * + * In particular, one problem might be that the filesystem cannot + * extract the information it needs from the above path object + * because Tcl's entire filesystem apparatus (the code in this + * file) has been finalized, and it refuses to pass the internal + * representation to the filesystem. + */ + } + + /* + * And free up the allocations. This will also of course remove a + * refCount from the Tcl_Filesystem to which this file belongs, which + * could then free up the filesystem if we are exiting. + */ + + Tcl_DecrRefCount(tvdlPtr->divertedFile); + } + + ckfree(tvdlPtr); +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSLink -- + * + * This function replaces the library version of readlink() and can also + * be used to make links. The appropriate function for the filesystem to + * which pathPtr belongs will be called. + * + * Results: + * If toPtr is NULL, then the result is a Tcl_Obj specifying the contents + * of the symbolic link given by 'pathPtr', or NULL if the symbolic link + * could not be read. The result is owned by the caller, which should + * call Tcl_DecrRefCount when the result is no longer needed. + * + * If toPtr is non-NULL, then the result is toPtr if the link action was + * successful, or NULL if not. In this case the result has no additional + * reference count, and need not be freed. The actual action to perform + * is given by the 'linkAction' flags, which is an or'd combination of: + * + * TCL_CREATE_SYMBOLIC_LINK + * TCL_CREATE_HARD_LINK + * + * Note that most filesystems will not support linking across to + * different filesystems, so this function will usually fail unless toPtr + * is in the same FS as pathPtr. + * + * Side effects: + * See readlink() documentation. A new filesystem link object may appear. + * + *--------------------------------------------------------------------------- + */ + +Tcl_Obj * +Tcl_FSLink( + Tcl_Obj *pathPtr, /* Path of file to readlink or link. */ + Tcl_Obj *toPtr, /* NULL or path to be linked to. */ + int linkAction) /* Action to perform. */ +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr != NULL && fsPtr->linkProc != NULL) { + return fsPtr->linkProc(pathPtr, toPtr, linkAction); + } + + /* + * If S_IFLNK isn't defined it means that the machine doesn't support + * symbolic links, so the file can't possibly be a symbolic link. Generate + * an EINVAL error, which is what happens on machines that do support + * symbolic links when you invoke readlink on a file that isn't a symbolic + * link. + */ + +#ifndef S_IFLNK + errno = EINVAL; /* TODO: Change to Tcl_SetErrno()? */ +#else + Tcl_SetErrno(ENOENT); +#endif /* S_IFLNK */ + return NULL; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSListVolumes -- + * + * Lists the currently mounted volumes. The chain of functions that have + * been "inserted" into the filesystem will be called in succession; each + * may return a list of volumes, all of which are added to the result + * until all mounted file systems are listed. + * + * Notice that we assume the lists returned by each filesystem (if non + * NULL) have been given a refCount for us already. However, we are NOT + * allowed to hang on to the list itself (it belongs to the filesystem we + * called). Therefore we quite naturally add its contents to the result + * we are building, and then decrement the refCount. + * + * Results: + * The list of volumes, in an object which has refCount 0. + * + * Side effects: + * None + * + *--------------------------------------------------------------------------- + */ + +Tcl_Obj * +Tcl_FSListVolumes(void) +{ + FilesystemRecord *fsRecPtr; + Tcl_Obj *resultPtr = Tcl_NewObj(); + + /* + * Call each of the "listVolumes" function in succession. A non-NULL + * return value indicates the particular function has succeeded. We call + * all the functions registered, since we want a list of all drives from + * all filesystems. + */ + + fsRecPtr = FsGetFirstFilesystem(); + Claim(); + while (fsRecPtr != NULL) { + if (fsRecPtr->fsPtr->listVolumesProc != NULL) { + Tcl_Obj *thisFsVolumes = fsRecPtr->fsPtr->listVolumesProc(); + + if (thisFsVolumes != NULL) { + Tcl_ListObjAppendList(NULL, resultPtr, thisFsVolumes); + Tcl_DecrRefCount(thisFsVolumes); + } + } + fsRecPtr = fsRecPtr->nextPtr; + } + Disclaim(); + + return resultPtr; +} + +/* + *--------------------------------------------------------------------------- + * + * FsListMounts -- + * + * List all mounts within the given directory, which match the given + * pattern. + * + * Results: + * The list of mounts, in a list object which has refCount 0, or NULL if + * we didn't even find any filesystems to try to list mounts. + * + * Side effects: + * None + * + *--------------------------------------------------------------------------- + */ + +static Tcl_Obj * +FsListMounts( + Tcl_Obj *pathPtr, /* Contains path to directory to search. */ + const char *pattern) /* Pattern to match against. */ +{ + FilesystemRecord *fsRecPtr; + Tcl_GlobTypeData mountsOnly = { TCL_GLOB_TYPE_MOUNT, 0, NULL, NULL }; + Tcl_Obj *resultPtr = NULL; + + /* + * Call each of the "matchInDirectory" functions in succession, with the + * specific type information 'mountsOnly'. A non-NULL return value + * indicates the particular function has succeeded. We call all the + * functions registered, since we want a list from each filesystems. + */ + + fsRecPtr = FsGetFirstFilesystem(); + Claim(); + while (fsRecPtr != NULL) { + if (fsRecPtr->fsPtr != &tclNativeFilesystem && + fsRecPtr->fsPtr->matchInDirectoryProc != NULL) { + if (resultPtr == NULL) { + resultPtr = Tcl_NewObj(); + } + fsRecPtr->fsPtr->matchInDirectoryProc(NULL, resultPtr, pathPtr, + pattern, &mountsOnly); + } + fsRecPtr = fsRecPtr->nextPtr; + } + Disclaim(); + + return resultPtr; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSSplitPath -- + * + * This function takes the given Tcl_Obj, which should be a valid path, + * and returns a Tcl List object containing each segment of that path as + * an element. + * + * Results: + * Returns list object with refCount of zero. If the passed in lenPtr is + * non-NULL, we use it to return the number of elements in the returned + * list. + * + * Side effects: + * None. + * + *--------------------------------------------------------------------------- + */ + +Tcl_Obj * +Tcl_FSSplitPath( + Tcl_Obj *pathPtr, /* Path to split. */ + int *lenPtr) /* int to store number of path elements. */ +{ + Tcl_Obj *result = NULL; /* Needed only to prevent gcc warnings. */ + const Tcl_Filesystem *fsPtr; + char separator = '/'; + int driveNameLength; + const char *p; + + /* + * Perform platform specific splitting. + */ + + if (TclFSGetPathType(pathPtr, &fsPtr, + &driveNameLength) == TCL_PATH_ABSOLUTE) { + if (fsPtr == &tclNativeFilesystem) { + return TclpNativeSplitPath(pathPtr, lenPtr); + } + } else { + return TclpNativeSplitPath(pathPtr, lenPtr); + } + + /* + * We assume separators are single characters. + */ + + if (fsPtr->filesystemSeparatorProc != NULL) { + Tcl_Obj *sep = fsPtr->filesystemSeparatorProc(pathPtr); + + if (sep != NULL) { + Tcl_IncrRefCount(sep); + separator = Tcl_GetString(sep)[0]; + Tcl_DecrRefCount(sep); + } + } + + /* + * Place the drive name as first element of the result list. The drive + * name may contain strange characters, like colons and multiple forward + * slashes (for example 'ftp://' is a valid vfs drive name) + */ + + result = Tcl_NewObj(); + p = Tcl_GetString(pathPtr); + Tcl_ListObjAppendElement(NULL, result, + Tcl_NewStringObj(p, driveNameLength)); + p += driveNameLength; + + /* + * Add the remaining path elements to the list. + */ + + for (;;) { + const char *elementStart = p; + int length; + + while ((*p != '\0') && (*p != separator)) { + p++; + } + length = p - elementStart; + if (length > 0) { + Tcl_Obj *nextElt; + + if (elementStart[0] == '~') { + TclNewLiteralStringObj(nextElt, "./"); + Tcl_AppendToObj(nextElt, elementStart, length); + } else { + nextElt = Tcl_NewStringObj(elementStart, length); + } + Tcl_ListObjAppendElement(NULL, result, nextElt); + } + if (*p++ == '\0') { + break; + } + } + + /* + * Compute the number of elements in the result. + */ + + if (lenPtr != NULL) { + TclListObjLength(NULL, result, lenPtr); + } + return result; +} +/* + *---------------------------------------------------------------------- + * + * TclGetPathType -- + * + * Helper function used by FSGetPathType. + * + * Results: + * Returns one of TCL_PATH_ABSOLUTE, TCL_PATH_RELATIVE, or + * TCL_PATH_VOLUME_RELATIVE. The filesystem reference will be set if and + * only if it is non-NULL and the function's return value is + * TCL_PATH_ABSOLUTE. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_PathType +TclGetPathType( + Tcl_Obj *pathPtr, /* Path to determine type for. */ + const Tcl_Filesystem **filesystemPtrPtr, + /* If absolute path and this is not NULL, then + * set to the filesystem which claims this + * path. */ + int *driveNameLengthPtr, /* If the path is absolute, and this is + * non-NULL, then set to the length of the + * driveName. */ + Tcl_Obj **driveNameRef) /* If the path is absolute, and this is + * non-NULL, then set to the name of the + * drive, network-volume which contains the + * path, already with a refCount for the + * caller. */ +{ + int pathLen; + const char *path = TclGetStringFromObj(pathPtr, &pathLen); + Tcl_PathType type; + + type = TclFSNonnativePathType(path, pathLen, filesystemPtrPtr, + driveNameLengthPtr, driveNameRef); + + if (type != TCL_PATH_ABSOLUTE) { + type = TclpGetNativePathType(pathPtr, driveNameLengthPtr, + driveNameRef); + if ((type == TCL_PATH_ABSOLUTE) && (filesystemPtrPtr != NULL)) { + *filesystemPtrPtr = &tclNativeFilesystem; + } + } + return type; +} + +/* + *---------------------------------------------------------------------- + * + * TclFSNonnativePathType -- + * + * Helper function used by TclGetPathType. Its purpose is to check + * whether the given path starts with a string which corresponds to a + * file volume in any registered filesystem except the native one. For + * speed and historical reasons the native filesystem has special + * hard-coded checks dotted here and there in the filesystem code. + * + * Results: + * Returns one of TCL_PATH_ABSOLUTE or TCL_PATH_RELATIVE. The filesystem + * reference will be set if and only if it is non-NULL and the function's + * return value is TCL_PATH_ABSOLUTE. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_PathType +TclFSNonnativePathType( + const char *path, /* Path to determine type for. */ + int pathLen, /* Length of the path. */ + const Tcl_Filesystem **filesystemPtrPtr, + /* If absolute path and this is not NULL, then + * set to the filesystem which claims this + * path. */ + int *driveNameLengthPtr, /* If the path is absolute, and this is + * non-NULL, then set to the length of the + * driveName. */ + Tcl_Obj **driveNameRef) /* If the path is absolute, and this is + * non-NULL, then set to the name of the + * drive, network-volume which contains the + * path, already with a refCount for the + * caller. */ +{ + FilesystemRecord *fsRecPtr; + Tcl_PathType type = TCL_PATH_RELATIVE; + + /* + * Call each of the "listVolumes" function in succession, checking whether + * the given path is an absolute path on any of the volumes returned (this + * is done by checking whether the path's prefix matches). + */ + + fsRecPtr = FsGetFirstFilesystem(); + Claim(); + while (fsRecPtr != NULL) { + /* + * We want to skip the native filesystem in this loop because + * otherwise we won't necessarily pass all the Tcl testsuite - this is + * because some of the tests artificially change the current platform + * (between win, unix) but the list of volumes we get by calling + * fsRecPtr->fsPtr->listVolumesProc will reflect the current (real) + * platform only and this may cause some tests to fail. In particular, + * on Unix '/' will match the beginning of certain absolute Windows + * paths starting '//' and those tests will go wrong. + * + * Besides these test-suite issues, there is one other reason to skip + * the native filesystem - since the tclFilename.c code has nice fast + * 'absolute path' checkers, we don't want to waste time repeating + * that effort here, and this function is actually called quite often, + * so if we can save the overhead of the native filesystem returning + * us a list of volumes all the time, it is better. + */ + + if ((fsRecPtr->fsPtr != &tclNativeFilesystem) + && (fsRecPtr->fsPtr->listVolumesProc != NULL)) { + int numVolumes; + Tcl_Obj *thisFsVolumes = fsRecPtr->fsPtr->listVolumesProc(); + + if (thisFsVolumes != NULL) { + if (Tcl_ListObjLength(NULL, thisFsVolumes, &numVolumes) + != TCL_OK) { + /* + * This is VERY bad; the listVolumesProc didn't return a + * valid list. Set numVolumes to -1 so that we skip the + * while loop below and just return with the current value + * of 'type'. + * + * It would be better if we could signal an error here + * (but Tcl_Panic seems a bit excessive). + */ + + numVolumes = -1; + } + while (numVolumes > 0) { + Tcl_Obj *vol; + int len; + const char *strVol; + + numVolumes--; + Tcl_ListObjIndex(NULL, thisFsVolumes, numVolumes, &vol); + strVol = TclGetStringFromObj(vol,&len); + if (pathLen < len) { + continue; + } + if (strncmp(strVol, path, (size_t) len) == 0) { + type = TCL_PATH_ABSOLUTE; + if (filesystemPtrPtr != NULL) { + *filesystemPtrPtr = fsRecPtr->fsPtr; + } + if (driveNameLengthPtr != NULL) { + *driveNameLengthPtr = len; + } + if (driveNameRef != NULL) { + *driveNameRef = vol; + Tcl_IncrRefCount(vol); + } + break; + } + } + Tcl_DecrRefCount(thisFsVolumes); + if (type == TCL_PATH_ABSOLUTE) { + /* + * We don't need to examine any more filesystems. + */ + + break; + } + } + } + fsRecPtr = fsRecPtr->nextPtr; + } + Disclaim(); + return type; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSRenameFile -- + * + * If the two paths given belong to the same filesystem, we call that + * filesystems rename function. Otherwise we simply return the POSIX + * error 'EXDEV', and -1. + * + * Results: + * Standard Tcl error code if a function was called. + * + * Side effects: + * A file may be renamed. + * + *--------------------------------------------------------------------------- + */ + +int +Tcl_FSRenameFile( + Tcl_Obj *srcPathPtr, /* Pathname of file or dir to be renamed + * (UTF-8). */ + Tcl_Obj *destPathPtr) /* New pathname of file or directory + * (UTF-8). */ +{ + int retVal = -1; + const Tcl_Filesystem *fsPtr, *fsPtr2; + + fsPtr = Tcl_FSGetFileSystemForPath(srcPathPtr); + fsPtr2 = Tcl_FSGetFileSystemForPath(destPathPtr); + + if ((fsPtr == fsPtr2) && (fsPtr != NULL) + && (fsPtr->renameFileProc != NULL)) { + retVal = fsPtr->renameFileProc(srcPathPtr, destPathPtr); + } + if (retVal == -1) { + Tcl_SetErrno(EXDEV); + } + return retVal; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSCopyFile -- + * + * If the two paths given belong to the same filesystem, we call that + * filesystem's copy function. Otherwise we simply return the POSIX error + * 'EXDEV', and -1. + * + * Note that in the native filesystems, 'copyFileProc' is defined to copy + * soft links (i.e. it copies the links themselves, not the things they + * point to). + * + * Results: + * Standard Tcl error code if a function was called. + * + * Side effects: + * A file may be copied. + * + *--------------------------------------------------------------------------- + */ + +int +Tcl_FSCopyFile( + Tcl_Obj *srcPathPtr, /* Pathname of file to be copied (UTF-8). */ + Tcl_Obj *destPathPtr) /* Pathname of file to copy to (UTF-8). */ +{ + int retVal = -1; + const Tcl_Filesystem *fsPtr, *fsPtr2; + + fsPtr = Tcl_FSGetFileSystemForPath(srcPathPtr); + fsPtr2 = Tcl_FSGetFileSystemForPath(destPathPtr); + + if (fsPtr == fsPtr2 && fsPtr != NULL && fsPtr->copyFileProc != NULL) { + retVal = fsPtr->copyFileProc(srcPathPtr, destPathPtr); + } + if (retVal == -1) { + Tcl_SetErrno(EXDEV); + } + return retVal; +} + +/* + *--------------------------------------------------------------------------- + * + * TclCrossFilesystemCopy -- + * + * Helper for above function, and for Tcl_FSLoadFile, to copy files from + * one filesystem to another. This function will overwrite the target + * file if it already exists. + * + * Results: + * Standard Tcl error code. + * + * Side effects: + * A file may be created. + * + *--------------------------------------------------------------------------- + */ + +int +TclCrossFilesystemCopy( + Tcl_Interp *interp, /* For error messages. */ + Tcl_Obj *source, /* Pathname of file to be copied (UTF-8). */ + Tcl_Obj *target) /* Pathname of file to copy to (UTF-8). */ +{ + int result = TCL_ERROR; + int prot = 0666; + Tcl_Channel in, out; + Tcl_StatBuf sourceStatBuf; + struct utimbuf tval; + + out = Tcl_FSOpenFileChannel(interp, target, "wb", prot); + if (out == NULL) { + /* + * It looks like we cannot copy it over. Bail out... + */ + goto done; + } + + in = Tcl_FSOpenFileChannel(interp, source, "rb", prot); + if (in == NULL) { + /* + * This is very strange, caller should have checked this... + */ + + Tcl_Close(interp, out); + goto done; + } + + /* + * Copy it synchronously. We might wish to add an asynchronous option to + * support vfs's which are slow (e.g. network sockets). + */ + + if (TclCopyChannel(interp, in, out, -1, NULL) == TCL_OK) { + result = TCL_OK; + } + + /* + * If the copy failed, assume that copy channel left a good error message. + */ + + Tcl_Close(interp, in); + Tcl_Close(interp, out); + + /* + * Set modification date of copied file. + */ + + if (Tcl_FSLstat(source, &sourceStatBuf) == 0) { + tval.actime = sourceStatBuf.st_atime; + tval.modtime = sourceStatBuf.st_mtime; + Tcl_FSUtime(target, &tval); + } + + done: + return result; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSDeleteFile -- + * + * The appropriate function for the filesystem to which pathPtr belongs + * will be called. + * + * Results: + * Standard Tcl error code. + * + * Side effects: + * A file may be deleted. + * + *--------------------------------------------------------------------------- + */ + +int +Tcl_FSDeleteFile( + Tcl_Obj *pathPtr) /* Pathname of file to be removed (UTF-8). */ +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr != NULL && fsPtr->deleteFileProc != NULL) { + return fsPtr->deleteFileProc(pathPtr); + } + Tcl_SetErrno(ENOENT); + return -1; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSCreateDirectory -- + * + * The appropriate function for the filesystem to which pathPtr belongs + * will be called. + * + * Results: + * Standard Tcl error code. + * + * Side effects: + * A directory may be created. + * + *--------------------------------------------------------------------------- + */ + +int +Tcl_FSCreateDirectory( + Tcl_Obj *pathPtr) /* Pathname of directory to create (UTF-8). */ +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr != NULL && fsPtr->createDirectoryProc != NULL) { + return fsPtr->createDirectoryProc(pathPtr); + } + Tcl_SetErrno(ENOENT); + return -1; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSCopyDirectory -- + * + * If the two paths given belong to the same filesystem, we call that + * filesystems copy-directory function. Otherwise we simply return the + * POSIX error 'EXDEV', and -1. + * + * Results: + * Standard Tcl error code if a function was called. + * + * Side effects: + * A directory may be copied. + * + *--------------------------------------------------------------------------- + */ + +int +Tcl_FSCopyDirectory( + Tcl_Obj *srcPathPtr, /* Pathname of directory to be copied + * (UTF-8). */ + Tcl_Obj *destPathPtr, /* Pathname of target directory (UTF-8). */ + Tcl_Obj **errorPtr) /* If non-NULL, then will be set to a new + * object containing name of file causing + * error, with refCount 1. */ +{ + int retVal = -1; + const Tcl_Filesystem *fsPtr, *fsPtr2; + + fsPtr = Tcl_FSGetFileSystemForPath(srcPathPtr); + fsPtr2 = Tcl_FSGetFileSystemForPath(destPathPtr); + + if (fsPtr == fsPtr2 && fsPtr != NULL && fsPtr->copyDirectoryProc != NULL){ + retVal = fsPtr->copyDirectoryProc(srcPathPtr, destPathPtr, errorPtr); + } + if (retVal == -1) { + Tcl_SetErrno(EXDEV); + } + return retVal; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSRemoveDirectory -- + * + * The appropriate function for the filesystem to which pathPtr belongs + * will be called. + * + * Results: + * Standard Tcl error code. + * + * Side effects: + * A directory may be deleted. + * + *--------------------------------------------------------------------------- + */ + +int +Tcl_FSRemoveDirectory( + Tcl_Obj *pathPtr, /* Pathname of directory to be removed + * (UTF-8). */ + int recursive, /* If non-zero, removes directories that are + * nonempty. Otherwise, will only remove empty + * directories. */ + Tcl_Obj **errorPtr) /* If non-NULL, then will be set to a new + * object containing name of file causing + * error, with refCount 1. */ +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr == NULL || fsPtr->removeDirectoryProc == NULL) { + Tcl_SetErrno(ENOENT); + return -1; + } + + /* + * When working recursively, we check whether the cwd lies inside this + * directory and move it if it does. + */ + + if (recursive) { + Tcl_Obj *cwdPtr = Tcl_FSGetCwd(NULL); + + if (cwdPtr != NULL) { + const char *cwdStr, *normPathStr; + int cwdLen, normLen; + Tcl_Obj *normPath = Tcl_FSGetNormalizedPath(NULL, pathPtr); + + if (normPath != NULL) { + normPathStr = TclGetStringFromObj(normPath, &normLen); + cwdStr = TclGetStringFromObj(cwdPtr, &cwdLen); + if ((cwdLen >= normLen) && (strncmp(normPathStr, cwdStr, + (size_t) normLen) == 0)) { + /* + * The cwd is inside the directory, so we perform a 'cd + * [file dirname $path]'. + */ + + Tcl_Obj *dirPtr = TclPathPart(NULL, pathPtr, + TCL_PATH_DIRNAME); + + Tcl_FSChdir(dirPtr); + Tcl_DecrRefCount(dirPtr); + } + } + Tcl_DecrRefCount(cwdPtr); + } + } + return fsPtr->removeDirectoryProc(pathPtr, recursive, errorPtr); +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSGetFileSystemForPath -- + * + * This function determines which filesystem to use for a particular path + * object, and returns the filesystem which accepts this file. If no + * filesystem will accept this object as a valid file path, then NULL is + * returned. + * + * Results: + * NULL or a filesystem which will accept this path. + * + * Side effects: + * The object may be converted to a path type. + * + *--------------------------------------------------------------------------- + */ + +const Tcl_Filesystem * +Tcl_FSGetFileSystemForPath( + Tcl_Obj *pathPtr) +{ + FilesystemRecord *fsRecPtr; + const Tcl_Filesystem *retVal = NULL; + + if (pathPtr == NULL) { + Tcl_Panic("Tcl_FSGetFileSystemForPath called with NULL object"); + return NULL; + } + + /* + * If the object has a refCount of zero, we reject it. This is to avoid + * possible segfaults or nondeterministic memory leaks (i.e. the user + * doesn't know if they should decrement the ref count on return or not). + */ + + if (pathPtr->refCount == 0) { + Tcl_Panic("Tcl_FSGetFileSystemForPath called with object with refCount == 0"); + return NULL; + } + + /* + * Check if the filesystem has changed in some way since this object's + * internal representation was calculated. Before doing that, assure we + * have the most up-to-date copy of the master filesystem. This is + * accomplished by the FsGetFirstFilesystem() call. + */ + + fsRecPtr = FsGetFirstFilesystem(); + Claim(); + + if (TclFSEnsureEpochOk(pathPtr, &retVal) != TCL_OK) { + Disclaim(); + return NULL; + } else if (retVal != NULL) { + /* TODO: Can this happen? */ + Disclaim(); + return retVal; + } + + /* + * Call each of the "pathInFilesystem" functions in succession. A + * non-return value of -1 indicates the particular function has succeeded. + */ + + for (; fsRecPtr!=NULL ; fsRecPtr=fsRecPtr->nextPtr) { + ClientData clientData = NULL; + + if (fsRecPtr->fsPtr->pathInFilesystemProc == NULL) { + continue; + } + + if (fsRecPtr->fsPtr->pathInFilesystemProc(pathPtr, &clientData)!=-1) { + /* + * We assume the type of pathPtr hasn't been changed by the above + * call to the pathInFilesystemProc. + */ + + TclFSSetPathDetails(pathPtr, fsRecPtr->fsPtr, clientData); + Disclaim(); + return fsRecPtr->fsPtr; + } + } + Disclaim(); + + return NULL; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSGetNativePath -- + * + * This function is for use by the Win/Unix native filesystems, so that + * they can easily retrieve the native (char* or TCHAR*) representation + * of a path. Other filesystems will probably want to implement similar + * functions. They basically act as a safety net around + * Tcl_FSGetInternalRep. Normally your file-system functions will always + * be called with path objects already converted to the correct + * filesystem, but if for some reason they are called directly (i.e. by + * functions not in this file), then one cannot necessarily guarantee + * that the path object pointer is from the correct filesystem. + * + * Note: in the future it might be desirable to have separate versions + * of this function with different signatures, for example + * Tcl_FSGetNativeWinPath, Tcl_FSGetNativeUnixPath etc. Right now, since + * native paths are all string based, we use just one function. + * + * Results: + * NULL or a valid native path. + * + * Side effects: + * See Tcl_FSGetInternalRep. + * + *--------------------------------------------------------------------------- + */ + +const void * +Tcl_FSGetNativePath( + Tcl_Obj *pathPtr) +{ + return Tcl_FSGetInternalRep(pathPtr, &tclNativeFilesystem); +} + +/* + *--------------------------------------------------------------------------- + * + * NativeFreeInternalRep -- + * + * Free a native internal representation, which will be non-NULL. + * + * Results: + * None. + * + * Side effects: + * Memory is released. + * + *--------------------------------------------------------------------------- + */ + +static void +NativeFreeInternalRep( + ClientData clientData) +{ + ckfree(clientData); +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSFileSystemInfo -- + * + * This function returns a list of two elements. The first element is the + * name of the filesystem (e.g. "native" or "vfs"), and the second is the + * particular type of the given path within that filesystem. + * + * Results: + * A list of two elements. + * + * Side effects: + * The object may be converted to a path type. + * + *--------------------------------------------------------------------------- + */ + +Tcl_Obj * +Tcl_FSFileSystemInfo( + Tcl_Obj *pathPtr) +{ + Tcl_Obj *resPtr; + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + + if (fsPtr == NULL) { + return NULL; + } + + resPtr = Tcl_NewListObj(0, NULL); + Tcl_ListObjAppendElement(NULL, resPtr, + Tcl_NewStringObj(fsPtr->typeName, -1)); + + if (fsPtr->filesystemPathTypeProc != NULL) { + Tcl_Obj *typePtr = fsPtr->filesystemPathTypeProc(pathPtr); + + if (typePtr != NULL) { + Tcl_ListObjAppendElement(NULL, resPtr, typePtr); + } + } + + return resPtr; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSPathSeparator -- + * + * This function returns the separator to be used for a given path. The + * object returned should have a refCount of zero + * + * Results: + * A Tcl object, with a refCount of zero. If the caller needs to retain a + * reference to the object, it should call Tcl_IncrRefCount, and should + * otherwise free the object. + * + * Side effects: + * The path object may be converted to a path type. + * + *--------------------------------------------------------------------------- + */ + +Tcl_Obj * +Tcl_FSPathSeparator( + Tcl_Obj *pathPtr) +{ + const Tcl_Filesystem *fsPtr = Tcl_FSGetFileSystemForPath(pathPtr); + Tcl_Obj *resultObj; + + if (fsPtr == NULL) { + return NULL; + } + + if (fsPtr->filesystemSeparatorProc != NULL) { + return fsPtr->filesystemSeparatorProc(pathPtr); + } + + /* + * Allow filesystems not to provide a filesystemSeparatorProc if they wish + * to use the standard forward slash. + */ + + TclNewLiteralStringObj(resultObj, "/"); + return resultObj; +} + +/* + *--------------------------------------------------------------------------- + * + * NativeFilesystemSeparator -- + * + * This function is part of the native filesystem support, and returns + * the separator for the given path. + * + * Results: + * String object containing the separator character. + * + * Side effects: + * None. + * + *--------------------------------------------------------------------------- + */ + +static Tcl_Obj * +NativeFilesystemSeparator( + Tcl_Obj *pathPtr) +{ + const char *separator = NULL; /* lint */ + + switch (tclPlatform) { + case TCL_PLATFORM_UNIX: + separator = "/"; + break; + case TCL_PLATFORM_WINDOWS: + separator = "\\"; + break; + } + return Tcl_NewStringObj(separator,1); +} + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |