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- /* $Id: tclMain.c,v 1.3 1994/06/30 18:52:53 mjl Exp $
- * $Log: tclMain.c,v $
- * Revision 1.3 1994/06/30 18:52:53 mjl
- * Minor change to eliminate a warning.
- *
- * Revision 1.2 1994/06/24 20:40:45 mjl
- * Created function to handle error condition. Is handled by indirection
- * through a global pointer, so can be replaced. This call has to bypass
- * the interpreter since it's important that the interp->result string is
- * not modified.
- *
- * Revision 1.1 1994/06/23 22:43:34 mjl
- * Handles nearly all the important setup for extended tclsh's. Taken from
- * tclMain.c of Tcl 7.3, and modified minimally to support my needs.
- */
-
- /*
- * Modified version of tclMain.c, from Tcl 7.3.
- * Maurice LeBrun
- * 23-Jun-1994
- *
- * Modifications include:
- * 1. main() changed to pltclMain().
- * 2. tcl_RcFileName changed to pltcl_RcFileName.
- * 3. Changes to work with ANSI C
- * 4. Changes to support user-installable error handler.
- *
- * The original notes follow.
- */
-
- /*
- * main.c --
- *
- * Main program for Tcl shells and other Tcl-based applications.
- *
- * Copyright (c) 1988-1993 The Regents of the University of California.
- * All rights reserved.
- *
- * Permission is hereby granted, without written agreement and without
- * license or royalty fees, to use, copy, modify, and distribute this
- * software and its documentation for any purpose, provided that the
- * above copyright notice and the following two paragraphs appear in
- * all copies of this software.
- *
- * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
- * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
- * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
- * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
- * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
- * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
- */
-
- #define _POSIX_SOURCE
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <tcl.h>
- #include <errno.h>
-
- /*
- * Declarations for various library procedures and variables (don't want
- * to include tclUnix.h here, because people might copy this file out of
- * the Tcl source directory to make their own modified versions).
- */
-
- extern int errno;
- extern void exit _ANSI_ARGS_((int status));
- extern int isatty _ANSI_ARGS_((int fd));
- extern char * strcpy _ANSI_ARGS_((char *dst, CONST char *src));
-
- static Tcl_Interp *interp; /* Interpreter for application. */
- static Tcl_DString command; /* Used to buffer incomplete commands being
- * read from stdin. */
- char *pltcl_RcFileName = NULL; /* Name of a user-specific startup script
- * to source if the application is being run
- * interactively (e.g. "~/.tclshrc"). Set
- * by Tcl_AppInit. NULL means don't source
- * anything ever. */
- #ifdef TCL_MEM_DEBUG
- static char dumpFile[100]; /* Records where to dump memory allocation
- * information. */
- static int quitFlag = 0; /* 1 means the "checkmem" command was
- * invoked, so the application should quit
- * and dump memory allocation information. */
- #endif
-
- /*
- * Forward references for procedures defined later in this file:
- */
-
- static int CheckmemCmd _ANSI_ARGS_((ClientData clientData,
- Tcl_Interp *interp, int argc, char *argv[]));
-
- static void
- ErrorHandler _ANSI_ARGS_((Tcl_Interp *interp, int code, int tty));
-
- /* This is globally visible and can be replaced */
-
- void (*tclErrorHandler)
- _ANSI_ARGS_((Tcl_Interp *interp, int code, int tty)) = ErrorHandler;
-
- /*
- *----------------------------------------------------------------------
- *
- * main --
- *
- * This is the main program for a Tcl-based shell that reads
- * Tcl commands from standard input.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Can be almost arbitrary, depending on what the Tcl commands do.
- *
- *----------------------------------------------------------------------
- */
-
- int
- pltclMain(int argc, char **argv)
- {
- char buffer[1000], *cmd, *args, *fileName;
- int code, gotPartial, tty;
- int exitCode = 0;
-
- interp = Tcl_CreateInterp();
- #ifdef TCL_MEM_DEBUG
- Tcl_InitMemory(interp);
- Tcl_CreateCommand(interp, "checkmem", CheckmemCmd, (ClientData) 0,
- (Tcl_CmdDeleteProc *) NULL);
- #endif
-
- /*
- * Make command-line arguments available in the Tcl variables "argc"
- * and "argv". If the first argument doesn't start with a "-" then
- * strip it off and use it as the name of a script file to process.
- */
-
- fileName = NULL;
- if ((argc > 1) && (argv[1][0] != '-')) {
- fileName = argv[1];
- argc--;
- argv++;
- }
- args = Tcl_Merge(argc-1, argv+1);
- Tcl_SetVar(interp, "argv", args, TCL_GLOBAL_ONLY);
- ckfree(args);
- sprintf(buffer, "%d", argc-1);
- Tcl_SetVar(interp, "argc", buffer, TCL_GLOBAL_ONLY);
- Tcl_SetVar(interp, "argv0", (fileName != NULL) ? fileName : argv[0],
- TCL_GLOBAL_ONLY);
-
- /*
- * Set the "tcl_interactive" variable.
- */
-
- tty = isatty(0);
- Tcl_SetVar(interp, "tcl_interactive",
- ((fileName == NULL) && tty) ? "1" : "0", TCL_GLOBAL_ONLY);
-
- /*
- * Invoke application-specific initialization.
- */
-
- if (Tcl_AppInit(interp) != TCL_OK) {
- fprintf(stderr, "Tcl_AppInit failed: %s\n", interp->result);
- }
-
- /*
- * If a script file was specified then just source that file
- * and quit.
- */
-
- if (fileName != NULL) {
- code = Tcl_EvalFile(interp, fileName);
- if (code != TCL_OK) {
- fprintf(stderr, "%s\n", interp->result);
- exitCode = 1;
- }
- goto done;
- }
-
- /*
- * We're running interactively. Source a user-specific startup
- * file if Tcl_AppInit specified one and if the file exists.
- */
-
- if (pltcl_RcFileName != NULL) {
- Tcl_DString buffer;
- char *fullName;
- FILE *f;
-
- fullName = Tcl_TildeSubst(interp, pltcl_RcFileName, &buffer);
- if (fullName == NULL) {
- fprintf(stderr, "%s\n", interp->result);
- } else {
- f = fopen(fullName, "r");
- if (f != NULL) {
- code = Tcl_EvalFile(interp, fullName);
- if (code != TCL_OK) {
- fprintf(stderr, "%s\n", interp->result);
- }
- fclose(f);
- }
- }
- Tcl_DStringFree(&buffer);
- }
-
- /*
- * Process commands from stdin until there's an end-of-file.
- */
-
- gotPartial = 0;
- Tcl_DStringInit(&command);
- while (1) {
- clearerr(stdin);
- if (tty) {
- char *promptCmd;
-
- promptCmd = Tcl_GetVar(interp,
- gotPartial ? "tcl_prompt2" : "tcl_prompt1", TCL_GLOBAL_ONLY);
- if (promptCmd == NULL) {
- defaultPrompt:
- if (!gotPartial) {
- fputs("% ", stdout);
- }
- } else {
- code = Tcl_Eval(interp, promptCmd);
- if (code != TCL_OK) {
- fprintf(stderr, "%s\n", interp->result);
- Tcl_AddErrorInfo(interp,
- "\n (script that generates prompt)");
- goto defaultPrompt;
- }
- }
- fflush(stdout);
- }
- if (fgets(buffer, 1000, stdin) == NULL) {
- if (ferror(stdin)) {
- if (errno == EINTR) {
- if (tcl_AsyncReady) {
- (void) Tcl_AsyncInvoke((Tcl_Interp *) NULL, 0);
- }
- clearerr(stdin);
- } else {
- goto done;
- }
- } else {
- if (!gotPartial) {
- goto done;
- }
- }
- buffer[0] = 0;
- }
- cmd = Tcl_DStringAppend(&command, buffer, -1);
- if ((buffer[0] != 0) && !Tcl_CommandComplete(cmd)) {
- gotPartial = 1;
- continue;
- }
-
- gotPartial = 0;
- code = Tcl_RecordAndEval(interp, cmd, 0);
- Tcl_DStringFree(&command);
-
- if ((code != TCL_OK) || (tty && (*interp->result != 0)))
- (*tclErrorHandler)(interp, code, tty);
-
- #ifdef TCL_MEM_DEBUG
- if (quitFlag) {
- Tcl_DeleteInterp(interp);
- Tcl_DumpActiveMemory(dumpFile);
- exit(0);
- }
- #endif
- }
-
- /*
- * 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_Eval call should never return.
- */
-
- done:
- sprintf(buffer, "exit %d", exitCode);
- Tcl_Eval(interp, buffer);
- return 1;
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * ErrorHandler --
- *
- * Handles error conditions while parsing. Can be replaced by the
- * caller, but only via the C API, as otherwise interp->result will
- * get trashed by the call.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Error info is printed to stdout or stderr.
- *
- *----------------------------------------------------------------------
- */
- /* ARGSUSED */
- static void
- ErrorHandler(interp, code, tty)
- Tcl_Interp *interp; /* Interpreter for evaluation. */
- int code; /* Error code returned by last cmd. */
- int tty; /* Set if connected to a tty. */
- {
- if (code != TCL_OK) {
- fprintf(stderr, "%s\n", interp->result);
-
- } else if (tty && (*interp->result != 0)) {
- printf("%s\n", interp->result);
- }
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * CheckmemCmd --
- *
- * This is the command procedure for the "checkmem" command, which
- * causes the application to exit after printing information about
- * memory usage to the file passed to this command as its first
- * argument.
- *
- * Results:
- * Returns a standard Tcl completion code.
- *
- * Side effects:
- * None.
- *
- *----------------------------------------------------------------------
- */
- #ifdef TCL_MEM_DEBUG
-
- /* ARGSUSED */
- static int
- CheckmemCmd(clientData, interp, argc, argv)
- ClientData clientData; /* Not used. */
- Tcl_Interp *interp; /* Interpreter for evaluation. */
- int argc; /* Number of arguments. */
- char *argv[]; /* String values of arguments. */
- {
- if (argc != 2) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " fileName\"", (char *) NULL);
- return TCL_ERROR;
- }
- strcpy(dumpFile, argv[1]);
- quitFlag = 1;
- return TCL_OK;
- }
- #endif
-