/* * tkMain.c -- * * This file contains a generic main program for Tk-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 Tk * applications. * * Copyright (c) 1990-1994 The Regents of the University of California. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tkMain.c,v 1.28.2.2 2010/05/31 10:29:29 nijtmans Exp $ */ #include "tclInt.h" #include "tkInt.h" #ifdef __WIN32__ #include "tkWinInt.h" #endif #ifdef MAC_OSX_TK #include "tkMacOSXInt.h" #endif typedef struct ThreadSpecificData { Tcl_Interp *interp; /* Interpreter for this thread. */ Tcl_DString command; /* Used to assemble lines of terminal input * into Tcl commands. */ Tcl_DString line; /* Used to read the next line from the * terminal input. */ int tty; /* Non-zero means standard input is a * terminal-like device. Zero means it's a * file. */ } ThreadSpecificData; static Tcl_ThreadDataKey dataKey; /* * Declarations for various library functions and variables (don't want to * include tkInt.h or tkPort.h here, because people might copy this file out * of the Tk source directory to make their own modified versions). Note: do * not declare "exit" here even though a declaration is really needed, because * it will conflict with a declaration elsewhere on some systems. */ #if !defined(__WIN32__) && !defined(_WIN32) extern int isatty(int fd); extern char * strrchr(CONST char *string, int c); #endif /* * Forward declarations for functions defined later in this file. */ static void Prompt(Tcl_Interp *interp, int partial); static void StdinProc(ClientData clientData, int mask); /* *---------------------------------------------------------------------- * * Tk_MainEx -- * * Main program for Wish and most other Tk-based applications. * * Results: * None. This function never returns (it exits the process when it's * done. * * Side effects: * This function initializes the Tk world and then starts interpreting * commands; almost anything could happen, depending on the script being * interpreted. * *---------------------------------------------------------------------- */ void Tk_MainEx( int argc, /* Number of arguments. */ char **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, *argvPtr; CONST char *encodingName; int code, nullStdin = 0; Tcl_Channel inChannel, outChannel; ThreadSpecificData *tsdPtr; #ifdef __WIN32__ HANDLE handle; #endif Tcl_DString appName; /* * Ensure that we are getting the matching version of Tcl. This is really * only an issue when Tk is loaded dynamically. */ if (Tcl_InitStubs(interp, TCL_VERSION, 0) == NULL) { abort(); } tsdPtr = (ThreadSpecificData *) Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData)); Tcl_FindExecutable(argv[0]); tsdPtr->interp = interp; Tcl_Preserve((ClientData) interp); #if defined(__WIN32__) Tk_InitConsoleChannels(interp); #endif #ifdef MAC_OSX_TK if (Tcl_GetStartupScript(NULL) == NULL) { TkMacOSXDefaultStartupScript(); } #endif #ifdef TCL_MEM_DEBUG Tcl_InitMemory(interp); #endif /* * 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)) { size_t length; /* * Check whether first 3 args (argv[1] - argv[3]) look like * -encoding ENCODING FILENAME * or like * FILENAME * or like * -file FILENAME (ancient history support only) */ if ((argc > 3) && (0 == strcmp("-encoding", argv[1])) && ('-' != argv[3][0])) { Tcl_SetStartupScript(Tcl_NewStringObj(argv[3], -1), argv[2]); argc -= 3; argv += 3; } else if ((argc > 1) && ('-' != argv[1][0])) { Tcl_SetStartupScript(Tcl_NewStringObj(argv[1], -1), NULL); argc--; argv++; } else if ((argc > 2) && (length = strlen(argv[1])) && (length > 1) && (0 == strncmp("-file", argv[1], length)) && ('-' != argv[2][0])) { Tcl_SetStartupScript(Tcl_NewStringObj(argv[2], -1), NULL); argc -= 2; argv += 2; } } path = Tcl_GetStartupScript(&encodingName); if (NULL == path) { Tcl_ExternalToUtfDString(NULL, argv[0], -1, &appName); } else { int numBytes; CONST char *pathName = Tcl_GetStringFromObj(path, &numBytes); Tcl_ExternalToUtfDString(NULL, pathName, numBytes, &appName); path = Tcl_NewStringObj(Tcl_DStringValue(&appName), -1); Tcl_SetStartupScript(path, encodingName); } Tcl_SetVar(interp, "argv0", Tcl_DStringValue(&appName), TCL_GLOBAL_ONLY); Tcl_DStringFree(&appName); argc--; argv++; Tcl_SetVar2Ex(interp, "argc", NULL, Tcl_NewIntObj(argc), TCL_GLOBAL_ONLY); argvPtr = Tcl_NewListObj(0, NULL); while (argc--) { Tcl_DString ds; Tcl_ExternalToUtfDString(NULL, *argv++, -1, &ds); Tcl_ListObjAppendElement(NULL, argvPtr, Tcl_NewStringObj( Tcl_DStringValue(&ds), Tcl_DStringLength(&ds))); Tcl_DStringFree(&ds); } Tcl_SetVar2Ex(interp, "argv", NULL, argvPtr, TCL_GLOBAL_ONLY); /* * Set the "tcl_interactive" variable. */ #ifdef __WIN32__ /* * For now, under Windows, we assume we are not running as a console mode * app, so we need to use the GUI console. In order to enable this, we * always claim to be running on a tty. This probably isn't the right way * to do it. */ handle = GetStdHandle(STD_INPUT_HANDLE); if ((handle == INVALID_HANDLE_VALUE) || (handle == 0) || (GetFileType(handle) == FILE_TYPE_UNKNOWN)) { /* * If it's a bad or closed handle, then it's been connected to a wish * console window. */ tsdPtr->tty = 1; } else if (GetFileType(handle) == FILE_TYPE_CHAR) { /* * A character file handle is a tty by definition. */ tsdPtr->tty = 1; } else { tsdPtr->tty = 0; } #else tsdPtr->tty = isatty(0); #endif #if defined(MAC_OSX_TK) /* * On TkAqua, if we don't have a TTY and stdin is a special character file * of length 0, (e.g. /dev/null, which is what Finder sets when double * clicking Wish) then use the GUI console. */ if (!tsdPtr->tty) { struct stat st; nullStdin = fstat(0, &st) || (S_ISCHR(st.st_mode) && !st.st_blocks); } #endif Tcl_SetVar(interp, "tcl_interactive", ((path == NULL) && (tsdPtr->tty || nullStdin)) ? "1" : "0", TCL_GLOBAL_ONLY); /* * Invoke application-specific initialization. */ if ((*appInitProc)(interp) != TCL_OK) { TkpDisplayWarning(Tcl_GetStringResult(interp), "Application initialization failed"); } /* * 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) { /* * The following statement guarantees that the errorInfo variable * is set properly. */ Tcl_AddErrorInfo(interp, ""); TkpDisplayWarning(Tcl_GetVar(interp, "errorInfo", TCL_GLOBAL_ONLY), "Error in startup script"); Tcl_DeleteInterp(interp); Tcl_Exit(1); } tsdPtr->tty = 0; } else { /* * Evaluate the .rc file, if one has been specified. */ Tcl_SourceRCFile(interp); /* * Establish a channel handler for stdin. */ inChannel = Tcl_GetStdChannel(TCL_STDIN); if (inChannel) { Tcl_CreateChannelHandler(inChannel, TCL_READABLE, StdinProc, (ClientData) inChannel); } if (tsdPtr->tty) { Prompt(interp, 0); } } outChannel = Tcl_GetStdChannel(TCL_STDOUT); if (outChannel) { Tcl_Flush(outChannel); } Tcl_DStringInit(&tsdPtr->command); Tcl_DStringInit(&tsdPtr->line); Tcl_ResetResult(interp); /* * Loop infinitely, waiting for commands to execute. When there are no * windows left, Tk_MainLoop returns and we exit. */ Tk_MainLoop(); Tcl_DeleteInterp(interp); Tcl_Release((ClientData) interp); Tcl_SetStartupScript(NULL, NULL); Tcl_Exit(0); } /* *---------------------------------------------------------------------- * * 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, /* Not used. */ int mask) /* Not used. */ { static int gotPartial = 0; char *cmd; int code, count; Tcl_Channel chan = (Tcl_Channel) clientData; ThreadSpecificData *tsdPtr = (ThreadSpecificData *) Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData)); Tcl_Interp *interp = tsdPtr->interp; count = Tcl_Gets(chan, &tsdPtr->line); if (count < 0 && !gotPartial) { if (tsdPtr->tty) { Tcl_Exit(0); } else { Tcl_DeleteChannelHandler(chan, StdinProc, (ClientData) chan); } return; } (void) Tcl_DStringAppend(&tsdPtr->command, Tcl_DStringValue( &tsdPtr->line), -1); cmd = Tcl_DStringAppend(&tsdPtr->command, "\n", -1); Tcl_DStringFree(&tsdPtr->line); if (!Tcl_CommandComplete(cmd)) { gotPartial = 1; goto prompt; } gotPartial = 0; /* * 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, (ClientData) chan); code = Tcl_RecordAndEval(interp, cmd, TCL_EVAL_GLOBAL); chan = Tcl_GetStdChannel(TCL_STDIN); if (chan) { Tcl_CreateChannelHandler(chan, TCL_READABLE, StdinProc, (ClientData) chan); } Tcl_DStringFree(&tsdPtr->command); if (Tcl_GetStringResult(interp)[0] != '\0') { if ((code != TCL_OK) || (tsdPtr->tty)) { chan = Tcl_GetStdChannel(TCL_STDOUT); if (chan) { Tcl_WriteObj(chan, Tcl_GetObjResult(interp)); Tcl_WriteChars(chan, "\n", 1); } } } /* * Output a prompt. */ prompt: if (tsdPtr->tty) { Prompt(interp, gotPartial); } Tcl_ResetResult(interp); } /* *---------------------------------------------------------------------- * * 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. */ int partial) /* Non-zero means there already exists a * partial command, so use the secondary * prompt. */ { Tcl_Obj *promptCmd; int code; Tcl_Channel outChannel, errChannel; promptCmd = Tcl_GetVar2Ex(interp, partial ? "tcl_prompt2" : "tcl_prompt1", NULL, TCL_GLOBAL_ONLY); if (promptCmd == NULL) { defaultPrompt: if (!partial) { /* * We must check that outChannel is a real channel - it is * possible that someone has transferred stdout out of this * interpreter with "interp transfer". */ outChannel = Tcl_GetChannel(interp, "stdout", NULL); if (outChannel != (Tcl_Channel) NULL) { Tcl_WriteChars(outChannel, "% ", 2); } } } else { code = Tcl_EvalObjEx(interp, promptCmd, TCL_EVAL_GLOBAL); if (code != TCL_OK) { Tcl_AddErrorInfo(interp, "\n (script that generates prompt)"); /* * We must check that errChannel is a real channel - it is * possible that someone has transferred stderr out of this * interpreter with "interp transfer". */ errChannel = Tcl_GetChannel(interp, "stderr", NULL); if (errChannel != (Tcl_Channel) NULL) { Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp)); Tcl_WriteChars(errChannel, "\n", 1); } goto defaultPrompt; } } outChannel = Tcl_GetChannel(interp, "stdout", NULL); if (outChannel != (Tcl_Channel) NULL) { Tcl_Flush(outChannel); } } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */