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Diffstat (limited to 'generic/tclMain.c')
| -rw-r--r-- | generic/tclMain.c | 950 |
1 files changed, 950 insertions, 0 deletions
diff --git a/generic/tclMain.c b/generic/tclMain.c new file mode 100644 index 0000000..f89bd5e --- /dev/null +++ b/generic/tclMain.c @@ -0,0 +1,950 @@ +/* + * tclMain.c -- + * + * Main program for Tcl shells and other Tcl-based applications. + * This file contains a generic main program for Tcl shells and other + * Tcl-based applications. It can be used as-is for many applications, + * just by supplying a different appInitProc function for each specific + * application. Or, it can be used as a template for creating new main + * programs for Tcl applications. + * + * Copyright (c) 1988-1994 The Regents of the University of California. + * Copyright (c) 1994-1997 Sun Microsystems, Inc. + * Copyright (c) 2000 Ajuba Solutions. + * + * See the file "license.terms" for information on usage and redistribution of + * this file, and for a DISCLAIMER OF ALL WARRANTIES. + */ + +/* + * On Windows, this file needs to be compiled twice, once with TCL_ASCII_MAIN + * defined. This way both Tcl_Main and Tcl_MainExW can be implemented, sharing + * the same source code. + */ + +#if defined(TCL_ASCII_MAIN) +# ifdef UNICODE +# undef UNICODE +# undef _UNICODE +# else +# define UNICODE +# define _UNICODE +# endif +#endif + +#include "tclInt.h" + +/* + * The default prompt used when the user has not overridden it. + */ + +#define DEFAULT_PRIMARY_PROMPT "% " + +/* + * This file can be compiled on Windows in UNICODE mode, as well as on all + * other platforms using the native encoding. This is done by using the normal + * Windows functions like _tcscmp, but on platforms which don't have <tchar.h> + * we have to translate that to strcmp here. + */ + +#ifndef _WIN32 +# define TCHAR char +# define TEXT(arg) arg +# define _tcscmp strcmp +#endif + +/* + * Further on, in UNICODE mode we just use Tcl_NewUnicodeObj, otherwise + * NewNativeObj is needed (which provides proper conversion from native + * encoding to UTF-8). + */ + +#ifdef UNICODE +# define NewNativeObj Tcl_NewUnicodeObj +#else /* !UNICODE */ +static inline Tcl_Obj * +NewNativeObj( + char *string, + int length) +{ + Tcl_DString ds; + + Tcl_ExternalToUtfDString(NULL, string, length, &ds); + return TclDStringToObj(&ds); +} +#endif /* !UNICODE */ + +/* + * Declarations for various library functions and variables (don't want to + * include tclPort.h here, because people might copy this file out of the Tcl + * source directory to make their own modified versions). + */ + +#if defined _MSC_VER && _MSC_VER < 1900 +/* isatty is always defined on MSVC 14.0, but not necessarily as CRTIMPORT. */ +extern CRTIMPORT int isatty(int fd); +#endif + +/* + * The thread-local variables for this file's functions. + */ + +typedef struct { + Tcl_Obj *path; /* The filename of the script for *_Main() + * routines to [source] as a startup script, + * or NULL for none set, meaning enter + * interactive mode. */ + Tcl_Obj *encoding; /* The encoding of the startup script file. */ + Tcl_MainLoopProc *mainLoopProc; + /* Any installed main loop handler. The main + * extension that installs these is Tk. */ +} ThreadSpecificData; + +/* + * Structure definition for information used to keep the state of an + * interactive command processor that reads lines from standard input and + * writes prompts and results to standard output. + */ + +typedef enum { + PROMPT_NONE, /* Print no prompt */ + PROMPT_START, /* Print prompt for command start */ + PROMPT_CONTINUE /* Print prompt for command continuation */ +} PromptType; + +typedef struct { + Tcl_Channel input; /* The standard input channel from which lines + * are read. */ + int tty; /* Non-zero means standard input is a + * terminal-like device. Zero means it's a + * file. */ + Tcl_Obj *commandPtr; /* Used to assemble lines of input into Tcl + * commands. */ + PromptType prompt; /* Next prompt to print */ + Tcl_Interp *interp; /* Interpreter that evaluates interactive + * commands. */ +} InteractiveState; + +/* + * Forward declarations for functions defined later in this file. + */ + +MODULE_SCOPE Tcl_MainLoopProc *TclGetMainLoop(void); +static void Prompt(Tcl_Interp *interp, InteractiveState *isPtr); +static void StdinProc(ClientData clientData, int mask); +static void FreeMainInterp(ClientData clientData); + +#ifndef TCL_ASCII_MAIN +static Tcl_ThreadDataKey dataKey; + +/* + *---------------------------------------------------------------------- + * + * Tcl_SetStartupScript -- + * + * Sets the path and encoding of the startup script to be evaluated by + * Tcl_Main, used to override the command line processing. + * + * Results: + * None. + * + * Side effects: + * + *---------------------------------------------------------------------- + */ + +void +Tcl_SetStartupScript( + Tcl_Obj *path, /* Filesystem path of startup script file */ + const char *encoding) /* Encoding of the data in that file */ +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + Tcl_Obj *newEncoding = NULL; + + if (encoding != NULL) { + newEncoding = Tcl_NewStringObj(encoding, -1); + } + + if (tsdPtr->path != NULL) { + Tcl_DecrRefCount(tsdPtr->path); + } + tsdPtr->path = path; + if (tsdPtr->path != NULL) { + Tcl_IncrRefCount(tsdPtr->path); + } + + if (tsdPtr->encoding != NULL) { + Tcl_DecrRefCount(tsdPtr->encoding); + } + tsdPtr->encoding = newEncoding; + if (tsdPtr->encoding != NULL) { + Tcl_IncrRefCount(tsdPtr->encoding); + } +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetStartupScript -- + * + * Gets the path and encoding of the startup script to be evaluated by + * Tcl_Main. + * + * Results: + * The path of the startup script; NULL if none has been set. + * + * Side effects: + * If encodingPtr is not NULL, stores a (const char *) in it pointing to + * the encoding name registered for the startup script. Tcl retains + * ownership of the string, and may free it. Caller should make a copy + * for long-term use. + * + *---------------------------------------------------------------------- + */ + +Tcl_Obj * +Tcl_GetStartupScript( + const char **encodingPtr) /* When not NULL, points to storage for the + * (const char *) that points to the + * registered encoding name for the startup + * script. */ +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + + if (encodingPtr != NULL) { + if (tsdPtr->encoding == NULL) { + *encodingPtr = NULL; + } else { + *encodingPtr = Tcl_GetString(tsdPtr->encoding); + } + } + return tsdPtr->path; +} + +/*---------------------------------------------------------------------- + * + * Tcl_SourceRCFile -- + * + * This function is typically invoked by Tcl_Main of Tk_Main function to + * source an application specific rc file into the interpreter at startup + * time. + * + * Results: + * None. + * + * Side effects: + * Depends on what's in the rc script. + * + *---------------------------------------------------------------------- + */ + +void +Tcl_SourceRCFile( + Tcl_Interp *interp) /* Interpreter to source rc file into. */ +{ + Tcl_DString temp; + const char *fileName; + Tcl_Channel chan; + + fileName = Tcl_GetVar2(interp, "tcl_rcFileName", NULL, TCL_GLOBAL_ONLY); + if (fileName != NULL) { + Tcl_Channel c; + const char *fullName; + + Tcl_DStringInit(&temp); + fullName = Tcl_TranslateFileName(interp, fileName, &temp); + if (fullName == NULL) { + /* + * Couldn't translate the file name (e.g. it referred to a bogus + * user or there was no HOME environment variable). Just do + * nothing. + */ + } else { + /* + * Test for the existence of the rc file before trying to read it. + */ + + c = Tcl_OpenFileChannel(NULL, fullName, "r", 0); + if (c != NULL) { + Tcl_Obj *fullNameObj = Tcl_NewStringObj(fullName, -1); + + Tcl_Close(NULL, c); + Tcl_IncrRefCount(fullNameObj); + if (Tcl_FSEvalFileEx(interp, fullNameObj, NULL) != TCL_OK) { + chan = Tcl_GetStdChannel(TCL_STDERR); + if (chan) { + Tcl_WriteObj(chan, Tcl_GetObjResult(interp)); + Tcl_WriteChars(chan, "\n", 1); + } + } + Tcl_DecrRefCount(fullNameObj); + } + } + Tcl_DStringFree(&temp); + } +} +#endif /* !TCL_ASCII_MAIN */ + +/*---------------------------------------------------------------------- + * + * Tcl_MainEx -- + * + * Main program for tclsh and most other Tcl-based applications. + * + * Results: + * None. This function never returns (it exits the process when it's + * done). + * + * Side effects: + * This function initializes the Tcl world and then starts interpreting + * commands; almost anything could happen, depending on the script being + * interpreted. + * + *---------------------------------------------------------------------- + */ + +void +Tcl_MainEx( + int argc, /* Number of arguments. */ + TCHAR **argv, /* Array of argument strings. */ + Tcl_AppInitProc *appInitProc, + /* Application-specific initialization + * function to call after most initialization + * but before starting to execute commands. */ + Tcl_Interp *interp) +{ + Tcl_Obj *path, *resultPtr, *argvPtr, *appName; + const char *encodingName = NULL; + int code, exitCode = 0; + Tcl_MainLoopProc *mainLoopProc; + Tcl_Channel chan; + InteractiveState is; + + TclpSetInitialEncodings(); + TclpFindExecutable((const char *)argv[0]); + + Tcl_InitMemory(interp); + + is.interp = interp; + is.prompt = PROMPT_START; + is.commandPtr = Tcl_NewObj(); + + /* + * If the application has not already set a startup script, parse the + * first few command line arguments to determine the script path and + * encoding. + */ + + if (NULL == Tcl_GetStartupScript(NULL)) { + /* + * Check whether first 3 args (argv[1] - argv[3]) look like + * -encoding ENCODING FILENAME + * or like + * FILENAME + */ + + if ((argc > 3) && (0 == _tcscmp(TEXT("-encoding"), argv[1])) + && ('-' != argv[3][0])) { + Tcl_Obj *value = NewNativeObj(argv[2], -1); + Tcl_SetStartupScript(NewNativeObj(argv[3], -1), + Tcl_GetString(value)); + Tcl_DecrRefCount(value); + argc -= 3; + argv += 3; + } else if ((argc > 1) && ('-' != argv[1][0])) { + Tcl_SetStartupScript(NewNativeObj(argv[1], -1), NULL); + argc--; + argv++; + } + } + + path = Tcl_GetStartupScript(&encodingName); + if (path == NULL) { + appName = NewNativeObj(argv[0], -1); + } else { + appName = path; + } + Tcl_SetVar2Ex(interp, "argv0", NULL, appName, TCL_GLOBAL_ONLY); + argc--; + argv++; + + Tcl_SetVar2Ex(interp, "argc", NULL, Tcl_NewIntObj(argc), TCL_GLOBAL_ONLY); + + argvPtr = Tcl_NewListObj(0, NULL); + while (argc--) { + Tcl_ListObjAppendElement(NULL, argvPtr, NewNativeObj(*argv++, -1)); + } + Tcl_SetVar2Ex(interp, "argv", NULL, argvPtr, TCL_GLOBAL_ONLY); + + /* + * Set the "tcl_interactive" variable. + */ + + is.tty = isatty(0); + Tcl_SetVar2Ex(interp, "tcl_interactive", NULL, + Tcl_NewIntObj(!path && is.tty), TCL_GLOBAL_ONLY); + + /* + * Invoke application-specific initialization. + */ + + Tcl_Preserve(interp); + if (appInitProc(interp) != TCL_OK) { + chan = Tcl_GetStdChannel(TCL_STDERR); + if (chan) { + Tcl_WriteChars(chan, + "application-specific initialization failed: ", -1); + Tcl_WriteObj(chan, Tcl_GetObjResult(interp)); + Tcl_WriteChars(chan, "\n", 1); + } + } + if (Tcl_InterpDeleted(interp)) { + goto done; + } + if (Tcl_LimitExceeded(interp)) { + goto done; + } + if (TclFullFinalizationRequested()) { + /* + * Arrange for final deletion of the main interp + */ + + /* ARGH Munchhausen effect */ + Tcl_CreateExitHandler(FreeMainInterp, interp); + } + + /* + * Invoke the script specified on the command line, if any. Must fetch it + * again, as the appInitProc might have reset it. + */ + + path = Tcl_GetStartupScript(&encodingName); + if (path != NULL) { + Tcl_ResetResult(interp); + code = Tcl_FSEvalFileEx(interp, path, encodingName); + if (code != TCL_OK) { + chan = Tcl_GetStdChannel(TCL_STDERR); + if (chan) { + Tcl_Obj *options = Tcl_GetReturnOptions(interp, code); + Tcl_Obj *keyPtr, *valuePtr; + + TclNewLiteralStringObj(keyPtr, "-errorinfo"); + Tcl_IncrRefCount(keyPtr); + Tcl_DictObjGet(NULL, options, keyPtr, &valuePtr); + Tcl_DecrRefCount(keyPtr); + + if (valuePtr) { + Tcl_WriteObj(chan, valuePtr); + } + Tcl_WriteChars(chan, "\n", 1); + Tcl_DecrRefCount(options); + } + exitCode = 1; + } + goto done; + } + + /* + * We're running interactively. Source a user-specific startup file if the + * application specified one and if the file exists. + */ + + Tcl_SourceRCFile(interp); + if (Tcl_LimitExceeded(interp)) { + goto done; + } + + /* + * Process commands from stdin until there's an end-of-file. Note that we + * need to fetch the standard channels again after every eval, since they + * may have been changed. + */ + + Tcl_IncrRefCount(is.commandPtr); + + /* + * Get a new value for tty if anyone writes to ::tcl_interactive + */ + + Tcl_LinkVar(interp, "tcl_interactive", (char *) &is.tty, TCL_LINK_BOOLEAN); + is.input = Tcl_GetStdChannel(TCL_STDIN); + while ((is.input != NULL) && !Tcl_InterpDeleted(interp)) { + mainLoopProc = TclGetMainLoop(); + if (mainLoopProc == NULL) { + int length; + + if (is.tty) { + Prompt(interp, &is); + if (Tcl_InterpDeleted(interp)) { + break; + } + if (Tcl_LimitExceeded(interp)) { + break; + } + is.input = Tcl_GetStdChannel(TCL_STDIN); + if (is.input == NULL) { + break; + } + } + if (Tcl_IsShared(is.commandPtr)) { + Tcl_DecrRefCount(is.commandPtr); + is.commandPtr = Tcl_DuplicateObj(is.commandPtr); + Tcl_IncrRefCount(is.commandPtr); + } + length = Tcl_GetsObj(is.input, is.commandPtr); + if (length < 0) { + if (Tcl_InputBlocked(is.input)) { + /* + * This can only happen if stdin has been set to + * non-blocking. In that case cycle back and try again. + * This sets up a tight polling loop (since we have no + * event loop running). If this causes bad CPU hogging, we + * might try toggling the blocking on stdin instead. + */ + + continue; + } + + /* + * Either EOF, or an error on stdin; we're done + */ + + break; + } + + /* + * Add the newline removed by Tcl_GetsObj back to the string. Have + * to add it back before testing completeness, because it can make + * a difference. [Bug 1775878] + */ + + if (Tcl_IsShared(is.commandPtr)) { + Tcl_DecrRefCount(is.commandPtr); + is.commandPtr = Tcl_DuplicateObj(is.commandPtr); + Tcl_IncrRefCount(is.commandPtr); + } + Tcl_AppendToObj(is.commandPtr, "\n", 1); + if (!TclObjCommandComplete(is.commandPtr)) { + is.prompt = PROMPT_CONTINUE; + continue; + } + + is.prompt = PROMPT_START; + + /* + * The final newline is syntactically redundant, and causes some + * error messages troubles deeper in, so lop it back off. + */ + + TclGetStringFromObj(is.commandPtr, &length); + Tcl_SetObjLength(is.commandPtr, --length); + code = Tcl_RecordAndEvalObj(interp, is.commandPtr, + TCL_EVAL_GLOBAL); + is.input = Tcl_GetStdChannel(TCL_STDIN); + Tcl_DecrRefCount(is.commandPtr); + is.commandPtr = Tcl_NewObj(); + Tcl_IncrRefCount(is.commandPtr); + if (code != TCL_OK) { + chan = Tcl_GetStdChannel(TCL_STDERR); + if (chan) { + Tcl_WriteObj(chan, Tcl_GetObjResult(interp)); + Tcl_WriteChars(chan, "\n", 1); + } + } else if (is.tty) { + resultPtr = Tcl_GetObjResult(interp); + Tcl_IncrRefCount(resultPtr); + TclGetStringFromObj(resultPtr, &length); + chan = Tcl_GetStdChannel(TCL_STDOUT); + if ((length > 0) && chan) { + Tcl_WriteObj(chan, resultPtr); + Tcl_WriteChars(chan, "\n", 1); + } + Tcl_DecrRefCount(resultPtr); + } + } else { /* (mainLoopProc != NULL) */ + /* + * If a main loop has been defined while running interactively, we + * want to start a fileevent based prompt by establishing a + * channel handler for stdin. + */ + + if (is.input) { + if (is.tty) { + Prompt(interp, &is); + } + + Tcl_CreateChannelHandler(is.input, TCL_READABLE, + StdinProc, &is); + } + + mainLoopProc(); + Tcl_SetMainLoop(NULL); + + if (is.input) { + Tcl_DeleteChannelHandler(is.input, StdinProc, &is); + } + is.input = Tcl_GetStdChannel(TCL_STDIN); + } + + /* + * This code here only for the (unsupported and deprecated) [checkmem] + * command. + */ + +#ifdef TCL_MEM_DEBUG + if (tclMemDumpFileName != NULL) { + Tcl_SetMainLoop(NULL); + Tcl_DeleteInterp(interp); + } +#endif /* TCL_MEM_DEBUG */ + } + + done: + mainLoopProc = TclGetMainLoop(); + if ((exitCode == 0) && mainLoopProc && !Tcl_LimitExceeded(interp)) { + /* + * If everything has gone OK so far, call the main loop proc, if it + * exists. Packages (like Tk) can set it to start processing events at + * this point. + */ + + mainLoopProc(); + Tcl_SetMainLoop(NULL); + } + if (is.commandPtr != NULL) { + Tcl_DecrRefCount(is.commandPtr); + } + + /* + * Rather than calling exit, invoke the "exit" command so that users can + * replace "exit" with some other command to do additional cleanup on + * exit. The Tcl_EvalObjEx call should never return. + */ + + if (!Tcl_InterpDeleted(interp) && !Tcl_LimitExceeded(interp)) { + Tcl_Obj *cmd = Tcl_ObjPrintf("exit %d", exitCode); + + Tcl_IncrRefCount(cmd); + Tcl_EvalObjEx(interp, cmd, TCL_EVAL_GLOBAL); + Tcl_DecrRefCount(cmd); + } + + /* + * If Tcl_EvalObjEx returns, trying to eval [exit], something unusual is + * happening. Maybe interp has been deleted; maybe [exit] was redefined, + * maybe we've blown up because of an exceeded limit. We still want to + * cleanup and exit. + */ + + Tcl_Exit(exitCode); +} + +#ifndef TCL_ASCII_MAIN + +/* + *--------------------------------------------------------------- + * + * Tcl_SetMainLoop -- + * + * Sets an alternative main loop function. + * + * Results: + * None. + * + * Side effects: + * This function will be called before Tcl exits, allowing for the + * creation of an event loop. + * + *--------------------------------------------------------------- + */ + +void +Tcl_SetMainLoop( + Tcl_MainLoopProc *proc) +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + + tsdPtr->mainLoopProc = proc; +} + +/* + *--------------------------------------------------------------- + * + * TclGetMainLoop -- + * + * Returns the current alternative main loop function. + * + * Results: + * Returns the previously defined main loop function, or NULL to indicate + * that no such function has been installed and standard tclsh behaviour + * (i.e., exit once the script is evaluated if not interactive) is + * requested.. + * + * Side effects: + * None (other than possible creation of this file's TSD block). + * + *--------------------------------------------------------------- + */ + +Tcl_MainLoopProc * +TclGetMainLoop(void) +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + + return tsdPtr->mainLoopProc; +} + +/* + *---------------------------------------------------------------------- + * + * TclFullFinalizationRequested -- + * + * This function returns true when either -DPURIFY is specified, or the + * environment variable TCL_FINALIZE_ON_EXIT is set and not "0". This + * predicate is called at places affecting the exit sequence, so that the + * default behavior is a fast and deadlock-free exit, and the modified + * behavior is a more thorough finalization for debugging purposes (leak + * hunting etc). + * + * Results: + * A boolean. + * + *---------------------------------------------------------------------- + */ + +MODULE_SCOPE int +TclFullFinalizationRequested(void) +{ +#ifdef PURIFY + return 1; +#else + const char *fin; + Tcl_DString ds; + int finalize = 0; + + fin = TclGetEnv("TCL_FINALIZE_ON_EXIT", &ds); + finalize = ((fin != NULL) && strcmp(fin, "0")); + if (fin != NULL) { + Tcl_DStringFree(&ds); + } + return finalize; +#endif /* PURIFY */ +} +#endif /* !TCL_ASCII_MAIN */ + +/* + *---------------------------------------------------------------------- + * + * StdinProc -- + * + * This function is invoked by the event dispatcher whenever standard + * input becomes readable. It grabs the next line of input characters, + * adds them to a command being assembled, and executes the command if + * it's complete. + * + * Results: + * None. + * + * Side effects: + * Could be almost arbitrary, depending on the command that's typed. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +static void +StdinProc( + ClientData clientData, /* The state of interactive cmd line */ + int mask) /* Not used. */ +{ + int code, length; + InteractiveState *isPtr = clientData; + Tcl_Channel chan = isPtr->input; + Tcl_Obj *commandPtr = isPtr->commandPtr; + Tcl_Interp *interp = isPtr->interp; + + if (Tcl_IsShared(commandPtr)) { + Tcl_DecrRefCount(commandPtr); + commandPtr = Tcl_DuplicateObj(commandPtr); + Tcl_IncrRefCount(commandPtr); + } + length = Tcl_GetsObj(chan, commandPtr); + if (length < 0) { + if (Tcl_InputBlocked(chan)) { + return; + } + if (isPtr->tty) { + /* + * Would be better to find a way to exit the mainLoop? Or perhaps + * evaluate [exit]? Leaving as is for now due to compatibility + * concerns. + */ + + Tcl_Exit(0); + } + Tcl_DeleteChannelHandler(chan, StdinProc, isPtr); + return; + } + + if (Tcl_IsShared(commandPtr)) { + Tcl_DecrRefCount(commandPtr); + commandPtr = Tcl_DuplicateObj(commandPtr); + Tcl_IncrRefCount(commandPtr); + } + Tcl_AppendToObj(commandPtr, "\n", 1); + if (!TclObjCommandComplete(commandPtr)) { + isPtr->prompt = PROMPT_CONTINUE; + goto prompt; + } + isPtr->prompt = PROMPT_START; + TclGetStringFromObj(commandPtr, &length); + Tcl_SetObjLength(commandPtr, --length); + + /* + * Disable the stdin channel handler while evaluating the command; + * otherwise if the command re-enters the event loop we might process + * commands from stdin before the current command is finished. Among other + * things, this will trash the text of the command being evaluated. + */ + + Tcl_CreateChannelHandler(chan, 0, StdinProc, isPtr); + code = Tcl_RecordAndEvalObj(interp, commandPtr, TCL_EVAL_GLOBAL); + isPtr->input = chan = Tcl_GetStdChannel(TCL_STDIN); + Tcl_DecrRefCount(commandPtr); + isPtr->commandPtr = commandPtr = Tcl_NewObj(); + Tcl_IncrRefCount(commandPtr); + if (chan != NULL) { + Tcl_CreateChannelHandler(chan, TCL_READABLE, StdinProc, isPtr); + } + if (code != TCL_OK) { + chan = Tcl_GetStdChannel(TCL_STDERR); + + if (chan != NULL) { + Tcl_WriteObj(chan, Tcl_GetObjResult(interp)); + Tcl_WriteChars(chan, "\n", 1); + } + } else if (isPtr->tty) { + Tcl_Obj *resultPtr = Tcl_GetObjResult(interp); + chan = Tcl_GetStdChannel(TCL_STDOUT); + + Tcl_IncrRefCount(resultPtr); + TclGetStringFromObj(resultPtr, &length); + if ((length > 0) && (chan != NULL)) { + Tcl_WriteObj(chan, resultPtr); + Tcl_WriteChars(chan, "\n", 1); + } + Tcl_DecrRefCount(resultPtr); + } + + /* + * If a tty stdin is still around, output a prompt. + */ + + prompt: + if (isPtr->tty && (isPtr->input != NULL)) { + Prompt(interp, isPtr); + isPtr->input = Tcl_GetStdChannel(TCL_STDIN); + } +} + +/* + *---------------------------------------------------------------------- + * + * Prompt -- + * + * Issue a prompt on standard output, or invoke a script to issue the + * prompt. + * + * Results: + * None. + * + * Side effects: + * A prompt gets output, and a Tcl script may be evaluated in interp. + * + *---------------------------------------------------------------------- + */ + +static void +Prompt( + Tcl_Interp *interp, /* Interpreter to use for prompting. */ + InteractiveState *isPtr) /* InteractiveState. Filled with PROMPT_NONE + * after a prompt is printed. */ +{ + Tcl_Obj *promptCmdPtr; + int code; + Tcl_Channel chan; + + if (isPtr->prompt == PROMPT_NONE) { + return; + } + + promptCmdPtr = Tcl_GetVar2Ex(interp, + (isPtr->prompt==PROMPT_CONTINUE ? "tcl_prompt2" : "tcl_prompt1"), + NULL, TCL_GLOBAL_ONLY); + + if (Tcl_InterpDeleted(interp)) { + return; + } + if (promptCmdPtr == NULL) { + defaultPrompt: + if (isPtr->prompt == PROMPT_START) { + chan = Tcl_GetStdChannel(TCL_STDOUT); + if (chan != NULL) { + Tcl_WriteChars(chan, DEFAULT_PRIMARY_PROMPT, + strlen(DEFAULT_PRIMARY_PROMPT)); + } + } + } else { + code = Tcl_EvalObjEx(interp, promptCmdPtr, TCL_EVAL_GLOBAL); + if (code != TCL_OK) { + Tcl_AddErrorInfo(interp, + "\n (script that generates prompt)"); + chan = Tcl_GetStdChannel(TCL_STDERR); + if (chan != NULL) { + Tcl_WriteObj(chan, Tcl_GetObjResult(interp)); + Tcl_WriteChars(chan, "\n", 1); + } + goto defaultPrompt; + } + } + + chan = Tcl_GetStdChannel(TCL_STDOUT); + if (chan != NULL) { + Tcl_Flush(chan); + } + isPtr->prompt = PROMPT_NONE; +} + +/* + *---------------------------------------------------------------------- + * + * FreeMainInterp -- + * + * Exit handler used to cleanup the main interpreter and ancillary + * startup script storage at exit. + * + *---------------------------------------------------------------------- + */ + +static void +FreeMainInterp( + ClientData clientData) +{ + Tcl_Interp *interp = clientData; + + /*if (TclInExit()) return;*/ + + if (!Tcl_InterpDeleted(interp)) { + Tcl_DeleteInterp(interp); + } + Tcl_SetStartupScript(NULL, NULL); + Tcl_Release(interp); +} + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |