/*
* tclMain.c --
*
* Main program for Tcl shells and other Tcl-based 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.
*
* RCS: @(#) $Id: tclMain.c,v 1.44 2007/12/13 15:23:19 dgp Exp $
*/
#include "tclInt.h"
#undef TCL_STORAGE_CLASS
#define TCL_STORAGE_CLASS DLLEXPORT
/*
* The default prompt used when the user has not overridden it.
*/
#define DEFAULT_PRIMARY_PROMPT "% "
/*
* 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).
*/
extern CRTIMPORT int isatty(int fd);
static Tcl_Obj *tclStartupScriptPath = NULL;
static Tcl_Obj *tclStartupScriptEncoding = NULL;
static Tcl_MainLoopProc *mainLoopProc = NULL;
/*
* 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 InteractiveState {
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.
*/
static void Prompt(Tcl_Interp *interp, PromptType *promptPtr);
static void StdinProc(ClientData clientData, int mask);
/*
*----------------------------------------------------------------------
*
* 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 */
{
Tcl_Obj *newEncoding = NULL;
if (encoding != NULL) {
newEncoding = Tcl_NewStringObj(encoding, -1);
}
if (tclStartupScriptPath != NULL) {
Tcl_DecrRefCount(tclStartupScriptPath);
}
tclStartupScriptPath = path;
if (tclStartupScriptPath != NULL) {
Tcl_IncrRefCount(tclStartupScriptPath);
}
if (tclStartupScriptEncoding != NULL) {
Tcl_DecrRefCount(tclStartupScriptEncoding);
}
tclStartupScriptEncoding = newEncoding;
if (tclStartupScriptEncoding != NULL) {
Tcl_IncrRefCount(tclStartupScriptEncoding);
}
}
/*
*----------------------------------------------------------------------
*
* 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 */
{
if (encodingPtr != NULL) {
if (tclStartupScriptEncoding == NULL) {
*encodingPtr = NULL;
} else {
*encodingPtr = Tcl_GetString(tclStartupScriptEncoding);
}
}
return tclStartupScriptPath;
}
/*
*----------------------------------------------------------------------
*
* TclSetStartupScriptPath --
*
* Primes the startup script VFS path, used to override the command line
* processing.
*
* Results:
* None.
*
* Side effects:
* This function initializes the VFS path of the Tcl script to run at
* startup.
*
*----------------------------------------------------------------------
*/
void
TclSetStartupScriptPath(
Tcl_Obj *path)
{
Tcl_SetStartupScript(path, NULL);
}
/*
*----------------------------------------------------------------------
*
* TclGetStartupScriptPath --
*
* Gets the startup script VFS path, used to override the command line
* processing.
*
* Results:
* The startup script VFS path, NULL if none has been set.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
TclGetStartupScriptPath(void)
{
return Tcl_GetStartupScript(NULL);
}
/*
*----------------------------------------------------------------------
*
* TclSetStartupScriptFileName --
*
* Primes the startup script file name, used to override the command line
* processing.
*
* Results:
* None.
*
* Side effects:
* This function initializes the file name of the Tcl script to run at
* startup.
*
*----------------------------------------------------------------------
*/
void
TclSetStartupScriptFileName(
CONST char *fileName)
{
Tcl_Obj *path = Tcl_NewStringObj(fileName,-1);
Tcl_SetStartupScript(path, NULL);
}
/*
*----------------------------------------------------------------------
*
* TclGetStartupScriptFileName --
*
* Gets the startup script file name, used to override the command line
* processing.
*
* Results:
* The startup script file name, NULL if none has been set.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
CONST char *
TclGetStartupScriptFileName(void)
{
Tcl_Obj *path = Tcl_GetStartupScript(NULL);
if (path == NULL) {
return NULL;
}
return Tcl_GetString(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 errChannel;
fileName = Tcl_GetVar(interp, "tcl_rcFileName", 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 != (Tcl_Channel) NULL) {
Tcl_Close(NULL, c);
if (Tcl_EvalFile(interp, fullName) != TCL_OK) {
errChannel = Tcl_GetStdChannel(TCL_STDERR);
if (errChannel) {
Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp));
Tcl_WriteChars(errChannel, "\n", 1);
}
}
}
}
Tcl_DStringFree(&temp);
}
}
/*----------------------------------------------------------------------
*
* Tcl_Main --
*
* 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_Main(
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_Obj *path, *resultPtr, *argvPtr, *commandPtr = NULL;
CONST char *encodingName = NULL;
PromptType prompt = PROMPT_START;
int code, length, tty, exitCode = 0;
Tcl_Channel inChannel, outChannel, errChannel;
Tcl_Interp *interp;
Tcl_DString appName;
Tcl_FindExecutable(argv[0]);
interp = Tcl_CreateInterp();
Tcl_InitMemory(interp);
/*
* 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 == 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++;
}
}
path = Tcl_GetStartupScript(&encodingName);
if (path == NULL) {
Tcl_ExternalToUtfDString(NULL, argv[0], -1, &appName);
} else {
CONST char *pathName = Tcl_GetStringFromObj(path, &length);
Tcl_ExternalToUtfDString(NULL, pathName, length, &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.
*/
tty = isatty(0);
Tcl_SetVar(interp, "tcl_interactive", ((path == NULL) && tty) ? "1" : "0",
TCL_GLOBAL_ONLY);
/*
* Invoke application-specific initialization.
*/
Tcl_Preserve((ClientData) interp);
if ((*appInitProc)(interp) != TCL_OK) {
errChannel = Tcl_GetStdChannel(TCL_STDERR);
if (errChannel) {
Tcl_WriteChars(errChannel,
"application-specific initialization failed: ", -1);
Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp));
Tcl_WriteChars(errChannel, "\n", 1);
}
}
if (Tcl_InterpDeleted(interp)) {
goto done;
}
if (Tcl_LimitExceeded(interp)) {
goto done;
}
/*
* If a script file was specified then just source that file and quit.
* Must fetch it again, as the appInitProc might have reset it.
*/
path = Tcl_GetStartupScript(&encodingName);
if (path != NULL) {
code = Tcl_FSEvalFileEx(interp, path, encodingName);
if (code != TCL_OK) {
errChannel = Tcl_GetStdChannel(TCL_STDERR);
if (errChannel) {
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(errChannel, valuePtr);
}
Tcl_WriteChars(errChannel, "\n", 1);
}
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.
*/
commandPtr = Tcl_NewObj();
Tcl_IncrRefCount(commandPtr);
/*
* Get a new value for tty if anyone writes to ::tcl_interactive
*/
Tcl_LinkVar(interp, "tcl_interactive", (char *) &tty, TCL_LINK_BOOLEAN);
inChannel = Tcl_GetStdChannel(TCL_STDIN);
outChannel = Tcl_GetStdChannel(TCL_STDOUT);
while ((inChannel != (Tcl_Channel) NULL) && !Tcl_InterpDeleted(interp)) {
if (mainLoopProc == NULL) {
if (tty) {
Prompt(interp, &prompt);
if (Tcl_InterpDeleted(interp)) {
break;
}
if (Tcl_LimitExceeded(interp)) {
break;
}
inChannel = Tcl_GetStdChannel(TCL_STDIN);
if (inChannel == (Tcl_Channel) NULL) {
break;
}
}
if (Tcl_IsShared(commandPtr)) {
Tcl_DecrRefCount(commandPtr);
commandPtr = Tcl_DuplicateObj(commandPtr);
Tcl_IncrRefCount(commandPtr);
}
length = Tcl_GetsObj(inChannel, commandPtr);
if (length < 0) {
if (Tcl_InputBlocked(inChannel)) {
/*
* 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(commandPtr)) {
Tcl_DecrRefCount(commandPtr);
commandPtr = Tcl_DuplicateObj(commandPtr);
Tcl_IncrRefCount(commandPtr);
}
Tcl_AppendToObj(commandPtr, "\n", 1);
if (!TclObjCommandComplete(commandPtr)) {
prompt = PROMPT_CONTINUE;
continue;
}
prompt = PROMPT_START;
/*
* The final newline is syntactically redundant, and causes
* some error messages troubles deeper in, so lop it back off.
*/
Tcl_GetStringFromObj(commandPtr, &length);
Tcl_SetObjLength(commandPtr, --length);
code = Tcl_RecordAndEvalObj(interp, commandPtr, TCL_EVAL_GLOBAL);
inChannel = Tcl_GetStdChannel(TCL_STDIN);
outChannel = Tcl_GetStdChannel(TCL_STDOUT);
errChannel = Tcl_GetStdChannel(TCL_STDERR);
Tcl_DecrRefCount(commandPtr);
commandPtr = Tcl_NewObj();
Tcl_IncrRefCount(commandPtr);
if (code != TCL_OK) {
if (errChannel) {
Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp));
Tcl_WriteChars(errChannel, "\n", 1);
}
} else if (tty) {
resultPtr = Tcl_GetObjResult(interp);
Tcl_IncrRefCount(resultPtr);
Tcl_GetStringFromObj(resultPtr, &length);
if ((length > 0) && outChannel) {
Tcl_WriteObj(outChannel, resultPtr);
Tcl_WriteChars(outChannel, "\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.
*/
InteractiveState *isPtr = NULL;
if (inChannel) {
if (tty) {
Prompt(interp, &prompt);
}
isPtr = (InteractiveState *)
ckalloc((int) sizeof(InteractiveState));
isPtr->input = inChannel;
isPtr->tty = tty;
isPtr->commandPtr = commandPtr;
isPtr->prompt = prompt;
isPtr->interp = interp;
Tcl_UnlinkVar(interp, "tcl_interactive");
Tcl_LinkVar(interp, "tcl_interactive", (char *) &(isPtr->tty),
TCL_LINK_BOOLEAN);
Tcl_CreateChannelHandler(inChannel, TCL_READABLE, StdinProc,
(ClientData) isPtr);
}
(*mainLoopProc)();
mainLoopProc = NULL;
if (inChannel) {
tty = isPtr->tty;
Tcl_UnlinkVar(interp, "tcl_interactive");
Tcl_LinkVar(interp, "tcl_interactive", (char *) &tty,
TCL_LINK_BOOLEAN);
prompt = isPtr->prompt;
commandPtr = isPtr->commandPtr;
if (isPtr->input != (Tcl_Channel) NULL) {
Tcl_DeleteChannelHandler(isPtr->input, StdinProc,
(ClientData) isPtr);
}
ckfree((char *)isPtr);
}
inChannel = Tcl_GetStdChannel(TCL_STDIN);
outChannel = Tcl_GetStdChannel(TCL_STDOUT);
errChannel = Tcl_GetStdChannel(TCL_STDERR);
}
#ifdef TCL_MEM_DEBUG
/*
* This code here only for the (unsupported and deprecated) [checkmem]
* command.
*/
if (tclMemDumpFileName != NULL) {
mainLoopProc = NULL;
Tcl_DeleteInterp(interp);
}
#endif
}
done:
if ((exitCode == 0) && (mainLoopProc != NULL)
&& !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)();
mainLoopProc = NULL;
}
if (commandPtr != NULL) {
Tcl_DecrRefCount(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)) {
if (!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.
*/
if (!Tcl_InterpDeleted(interp)) {
Tcl_DeleteInterp(interp);
}
}
Tcl_SetStartupScript(NULL, NULL);
/*
* If we get here, the master interp has been deleted. Allow its
* destruction with the last matching Tcl_Release.
*/
Tcl_Release((ClientData) interp);
Tcl_Exit(exitCode);
}
/*
*---------------------------------------------------------------
*
* Tcl_SetMainLoop --
*
* Sets an alternative main loop function.
*
* Results:
* Returns the previously defined main loop function.
*
* Side effects:
* This function will be called before Tcl exits, allowing for the
* creation of an event loop.
*
*---------------------------------------------------------------
*/
void
Tcl_SetMainLoop(
Tcl_MainLoopProc *proc)
{
mainLoopProc = proc;
}
/*
*----------------------------------------------------------------------
*
* 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. */
{
InteractiveState *isPtr = (InteractiveState *) clientData;
Tcl_Channel chan = isPtr->input;
Tcl_Obj *commandPtr = isPtr->commandPtr;
Tcl_Interp *interp = isPtr->interp;
int code, length;
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, (ClientData) 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;
Tcl_GetStringFromObj(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, (ClientData) 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 != (Tcl_Channel) NULL) {
Tcl_CreateChannelHandler(chan, TCL_READABLE, StdinProc,
(ClientData) isPtr);
}
if (code != TCL_OK) {
Tcl_Channel errChannel = Tcl_GetStdChannel(TCL_STDERR);
if (errChannel != (Tcl_Channel) NULL) {
Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp));
Tcl_WriteChars(errChannel, "\n", 1);
}
} else if (isPtr->tty) {
Tcl_Obj *resultPtr = Tcl_GetObjResult(interp);
Tcl_Channel outChannel = Tcl_GetStdChannel(TCL_STDOUT);
Tcl_IncrRefCount(resultPtr);
Tcl_GetStringFromObj(resultPtr, &length);
if ((length >0) && (outChannel != (Tcl_Channel) NULL)) {
Tcl_WriteObj(outChannel, resultPtr);
Tcl_WriteChars(outChannel, "\n", 1);
}
Tcl_DecrRefCount(resultPtr);
}
/*
* If a tty stdin is still around, output a prompt.
*/
prompt:
if (isPtr->tty && (isPtr->input != (Tcl_Channel) NULL)) {
Prompt(interp, &(isPtr->prompt));
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. */
PromptType *promptPtr) /* Points to type of prompt to print. Filled
* with PROMPT_NONE after a prompt is
* printed. */
{
Tcl_Obj *promptCmdPtr;
int code;
Tcl_Channel outChannel, errChannel;
if (*promptPtr == PROMPT_NONE) {
return;
}
promptCmdPtr = Tcl_GetVar2Ex(interp,
((*promptPtr == PROMPT_CONTINUE) ? "tcl_prompt2" : "tcl_prompt1"),
NULL, TCL_GLOBAL_ONLY);
if (Tcl_InterpDeleted(interp)) {
return;
}
if (promptCmdPtr == NULL) {
defaultPrompt:
outChannel = Tcl_GetStdChannel(TCL_STDOUT);
if ((*promptPtr == PROMPT_START)
&& (outChannel != (Tcl_Channel) NULL)) {
Tcl_WriteChars(outChannel, 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)");
errChannel = Tcl_GetStdChannel(TCL_STDERR);
if (errChannel != (Tcl_Channel) NULL) {
Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp));
Tcl_WriteChars(errChannel, "\n", 1);
}
goto defaultPrompt;
}
}
outChannel = Tcl_GetStdChannel(TCL_STDOUT);
if (outChannel != (Tcl_Channel) NULL) {
Tcl_Flush(outChannel);
}
*promptPtr = PROMPT_NONE;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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