314 lines
8.5 KiB
C
314 lines
8.5 KiB
C
/*
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* tclMain.c --
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*
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* Main program for Tcl shells and other Tcl-based applications.
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*
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* Copyright (c) 1988-1994 The Regents of the University of California.
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* Copyright (c) 1994-1996 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tclMain.c 1.51 96/09/05 17:57:01
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*/
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#include "tcl.h"
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#include "tclInt.h"
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/*
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* The following code ensures that tclLink.c is linked whenever
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* Tcl is linked. Without this code there's no reference to the
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* code in that file from anywhere in Tcl, so it may not be
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* linked into the application.
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*/
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EXTERN int Tcl_LinkVar();
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int (*tclDummyLinkVarPtr)() = Tcl_LinkVar;
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/*
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* Declarations for various library procedures and variables (don't want
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* to include tclPort.h here, because people might copy this file out of
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* the Tcl source directory to make their own modified versions).
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* Note: "exit" should really be declared here, but there's no way to
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* declare it without causing conflicts with other definitions elsewher
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* on some systems, so it's better just to leave it out.
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*/
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extern int isatty _ANSI_ARGS_((int fd));
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extern char * strcpy _ANSI_ARGS_((char *dst, CONST char *src));
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static Tcl_Interp *interp; /* Interpreter for application. */
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static Tcl_DString command; /* Used to buffer incomplete commands being
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* read from stdin. */
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#ifdef TCL_MEM_DEBUG
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static char dumpFile[100]; /* Records where to dump memory allocation
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* information. */
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static int quitFlag = 0; /* 1 means the "checkmem" command was
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* invoked, so the application should quit
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* and dump memory allocation information. */
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#endif
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/*
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* Forward references for procedures defined later in this file:
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*/
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#ifdef TCL_MEM_DEBUG
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static int CheckmemCmd _ANSI_ARGS_((ClientData clientData,
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Tcl_Interp *interp, int argc, char *argv[]));
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#endif
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_Main --
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*
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* Main program for tclsh and most other Tcl-based applications.
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*
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* Results:
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* None. This procedure never returns (it exits the process when
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* it's done.
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*
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* Side effects:
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* This procedure initializes the Tk world and then starts
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* interpreting commands; almost anything could happen, depending
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* on the script being interpreted.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tcl_Main(argc, argv, appInitProc)
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int argc; /* Number of arguments. */
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char **argv; /* Array of argument strings. */
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Tcl_AppInitProc *appInitProc; /* Application-specific initialization
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* procedure to call after most
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* initialization but before starting
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* to execute commands. */
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{
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char buffer[1000], *cmd, *args, *fileName;
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int code, gotPartial, tty, length;
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int exitCode = 0;
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Tcl_Channel inChannel, outChannel, errChannel;
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Tcl_FindExecutable(argv[0]);
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interp = Tcl_CreateInterp();
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#ifdef TCL_MEM_DEBUG
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Tcl_InitMemory(interp);
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Tcl_CreateCommand(interp, "checkmem", CheckmemCmd, (ClientData) 0,
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(Tcl_CmdDeleteProc *) NULL);
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#endif
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/*
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* Make command-line arguments available in the Tcl variables "argc"
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* and "argv". If the first argument doesn't start with a "-" then
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* strip it off and use it as the name of a script file to process.
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*/
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fileName = NULL;
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if ((argc > 1) && (argv[1][0] != '-')) {
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fileName = argv[1];
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argc--;
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argv++;
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}
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args = Tcl_Merge(argc-1, argv+1);
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Tcl_SetVar(interp, "argv", args, TCL_GLOBAL_ONLY);
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ckfree(args);
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sprintf(buffer, "%d", argc-1);
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Tcl_SetVar(interp, "argc", buffer, TCL_GLOBAL_ONLY);
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Tcl_SetVar(interp, "argv0", (fileName != NULL) ? fileName : argv[0],
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TCL_GLOBAL_ONLY);
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/*
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* Set the "tcl_interactive" variable.
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*/
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tty = isatty(0);
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Tcl_SetVar(interp, "tcl_interactive",
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((fileName == NULL) && tty) ? "1" : "0", TCL_GLOBAL_ONLY);
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/*
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* Invoke application-specific initialization.
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*/
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if ((*appInitProc)(interp) != TCL_OK) {
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errChannel = Tcl_GetStdChannel(TCL_STDERR);
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if (errChannel) {
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Tcl_Write(errChannel,
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"application-specific initialization failed: ", -1);
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Tcl_Write(errChannel, interp->result, -1);
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Tcl_Write(errChannel, "\n", 1);
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}
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}
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/*
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* If a script file was specified then just source that file
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* and quit.
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*/
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if (fileName != NULL) {
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code = Tcl_EvalFile(interp, fileName);
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if (code != TCL_OK) {
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errChannel = Tcl_GetStdChannel(TCL_STDERR);
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if (errChannel) {
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/*
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* The following statement guarantees that the errorInfo
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* variable is set properly.
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*/
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Tcl_AddErrorInfo(interp, "");
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Tcl_Write(errChannel,
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Tcl_GetVar(interp, "errorInfo", TCL_GLOBAL_ONLY), -1);
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Tcl_Write(errChannel, "\n", 1);
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}
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exitCode = 1;
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}
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goto done;
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}
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/*
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* We're running interactively. Source a user-specific startup
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* file if the application specified one and if the file exists.
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*/
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Tcl_SourceRCFile(interp);
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/*
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* Process commands from stdin until there's an end-of-file. Note
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* that we need to fetch the standard channels again after every
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* eval, since they may have been changed.
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*/
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gotPartial = 0;
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Tcl_DStringInit(&command);
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inChannel = Tcl_GetStdChannel(TCL_STDIN);
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outChannel = Tcl_GetStdChannel(TCL_STDOUT);
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while (1) {
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if (tty) {
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char *promptCmd;
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promptCmd = Tcl_GetVar(interp,
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gotPartial ? "tcl_prompt2" : "tcl_prompt1", TCL_GLOBAL_ONLY);
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if (promptCmd == NULL) {
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defaultPrompt:
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if (!gotPartial && outChannel) {
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Tcl_Write(outChannel, "% ", 2);
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}
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} else {
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code = Tcl_Eval(interp, promptCmd);
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inChannel = Tcl_GetStdChannel(TCL_STDIN);
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outChannel = Tcl_GetStdChannel(TCL_STDOUT);
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errChannel = Tcl_GetStdChannel(TCL_STDERR);
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if (code != TCL_OK) {
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if (errChannel) {
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Tcl_Write(errChannel, interp->result, -1);
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Tcl_Write(errChannel, "\n", 1);
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}
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Tcl_AddErrorInfo(interp,
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"\n (script that generates prompt)");
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goto defaultPrompt;
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}
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}
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if (outChannel) {
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Tcl_Flush(outChannel);
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}
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}
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if (!inChannel) {
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goto done;
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}
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length = Tcl_Gets(inChannel, &command);
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if (length < 0) {
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goto done;
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}
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if ((length == 0) && Tcl_Eof(inChannel) && (!gotPartial)) {
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goto done;
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}
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/*
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* Add the newline removed by Tcl_Gets back to the string.
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*/
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(void) Tcl_DStringAppend(&command, "\n", -1);
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cmd = Tcl_DStringValue(&command);
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if (!Tcl_CommandComplete(cmd)) {
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gotPartial = 1;
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continue;
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}
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gotPartial = 0;
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code = Tcl_RecordAndEval(interp, cmd, 0);
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inChannel = Tcl_GetStdChannel(TCL_STDIN);
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outChannel = Tcl_GetStdChannel(TCL_STDOUT);
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errChannel = Tcl_GetStdChannel(TCL_STDERR);
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Tcl_DStringFree(&command);
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if (code != TCL_OK) {
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if (errChannel) {
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Tcl_Write(errChannel, interp->result, -1);
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Tcl_Write(errChannel, "\n", 1);
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}
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} else if (tty && (*interp->result != 0)) {
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if (outChannel) {
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Tcl_Write(outChannel, interp->result, -1);
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Tcl_Write(outChannel, "\n", 1);
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}
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}
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#ifdef TCL_MEM_DEBUG
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if (quitFlag) {
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Tcl_DeleteInterp(interp);
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Tcl_Exit(0);
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}
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#endif
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}
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/*
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* Rather than calling exit, invoke the "exit" command so that
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* users can replace "exit" with some other command to do additional
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* cleanup on exit. The Tcl_Eval call should never return.
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*/
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done:
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sprintf(buffer, "exit %d", exitCode);
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Tcl_Eval(interp, buffer);
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}
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/*
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*----------------------------------------------------------------------
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*
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* CheckmemCmd --
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*
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* This is the command procedure for the "checkmem" command, which
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* causes the application to exit after printing information about
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* memory usage to the file passed to this command as its first
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* argument.
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*
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* Results:
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* Returns a standard Tcl completion code.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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#ifdef TCL_MEM_DEBUG
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/* ARGSUSED */
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static int
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CheckmemCmd(clientData, interp, argc, argv)
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ClientData clientData; /* Not used. */
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Tcl_Interp *interp; /* Interpreter for evaluation. */
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int argc; /* Number of arguments. */
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char *argv[]; /* String values of arguments. */
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{
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extern char *tclMemDumpFileName;
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if (argc != 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" fileName\"", (char *) NULL);
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return TCL_ERROR;
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}
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strcpy(dumpFile, argv[1]);
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tclMemDumpFileName = dumpFile;
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quitFlag = 1;
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return TCL_OK;
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}
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#endif
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