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archie/tcl7.3/tclBasic.c

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Intial commit
2024-05-27 16:13:40 +02:00
/*
* tclBasic.c --
*
* Contains the basic facilities for TCL command interpretation,
* including interpreter creation and deletion, command creation
* and deletion, and command parsing and execution.
*
* Copyright (c) 1987-1993 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.
*/
#ifndef lint
static char rcsid[] = "$Header: /user6/ouster/tcl/RCS/tclBasic.c,v 1.153 93/09/09 16:43:19 ouster Exp $ SPRITE (Berkeley)";
#endif
#include "tclInt.h"
#ifndef TCL_GENERIC_ONLY
# include "tclUnix.h"
#endif
/*
* The following structure defines all of the commands in the Tcl core,
* and the C procedures that execute them.
*/
typedef struct {
char *name; /* Name of command. */
Tcl_CmdProc *proc; /* Procedure that executes command. */
} CmdInfo;
/*
* Built-in commands, and the procedures associated with them:
*/
static CmdInfo builtInCmds[] = {
/*
* Commands in the generic core:
*/
{"append", Tcl_AppendCmd},
{"array", Tcl_ArrayCmd},
{"break", Tcl_BreakCmd},
{"case", Tcl_CaseCmd},
{"catch", Tcl_CatchCmd},
{"concat", Tcl_ConcatCmd},
{"continue", Tcl_ContinueCmd},
{"error", Tcl_ErrorCmd},
{"eval", Tcl_EvalCmd},
{"expr", Tcl_ExprCmd},
{"for", Tcl_ForCmd},
{"foreach", Tcl_ForeachCmd},
{"format", Tcl_FormatCmd},
{"global", Tcl_GlobalCmd},
{"history", Tcl_HistoryCmd},
{"if", Tcl_IfCmd},
{"incr", Tcl_IncrCmd},
{"info", Tcl_InfoCmd},
{"join", Tcl_JoinCmd},
{"lappend", Tcl_LappendCmd},
{"lindex", Tcl_LindexCmd},
{"linsert", Tcl_LinsertCmd},
{"list", Tcl_ListCmd},
{"llength", Tcl_LlengthCmd},
{"lrange", Tcl_LrangeCmd},
{"lreplace", Tcl_LreplaceCmd},
{"lsearch", Tcl_LsearchCmd},
{"lsort", Tcl_LsortCmd},
{"proc", Tcl_ProcCmd},
{"regexp", Tcl_RegexpCmd},
{"regsub", Tcl_RegsubCmd},
{"rename", Tcl_RenameCmd},
{"return", Tcl_ReturnCmd},
{"scan", Tcl_ScanCmd},
{"set", Tcl_SetCmd},
{"split", Tcl_SplitCmd},
{"string", Tcl_StringCmd},
{"switch", Tcl_SwitchCmd},
{"trace", Tcl_TraceCmd},
{"unset", Tcl_UnsetCmd},
{"uplevel", Tcl_UplevelCmd},
{"upvar", Tcl_UpvarCmd},
{"while", Tcl_WhileCmd},
/*
* Commands in the UNIX core:
*/
#ifndef TCL_GENERIC_ONLY
{"cd", Tcl_CdCmd},
{"close", Tcl_CloseCmd},
{"eof", Tcl_EofCmd},
{"exec", Tcl_ExecCmd},
{"exit", Tcl_ExitCmd},
{"file", Tcl_FileCmd},
{"flush", Tcl_FlushCmd},
{"gets", Tcl_GetsCmd},
{"glob", Tcl_GlobCmd},
{"open", Tcl_OpenCmd},
{"pid", Tcl_PidCmd},
{"puts", Tcl_PutsCmd},
{"pwd", Tcl_PwdCmd},
{"read", Tcl_ReadCmd},
{"seek", Tcl_SeekCmd},
{"source", Tcl_SourceCmd},
{"tell", Tcl_TellCmd},
{"time", Tcl_TimeCmd},
#endif /* TCL_GENERIC_ONLY */
{NULL, (Tcl_CmdProc *) NULL}
};
/*
*----------------------------------------------------------------------
*
* Tcl_CreateInterp --
*
* Create a new TCL command interpreter.
*
* Results:
* The return value is a token for the interpreter, which may be
* used in calls to procedures like Tcl_CreateCmd, Tcl_Eval, or
* Tcl_DeleteInterp.
*
* Side effects:
* The command interpreter is initialized with an empty variable
* table and the built-in commands. SIGPIPE signals are set to
* be ignored (see comment below for details).
*
*----------------------------------------------------------------------
*/
Tcl_Interp *
Tcl_CreateInterp()
{
register Interp *iPtr;
register Command *cmdPtr;
register CmdInfo *cmdInfoPtr;
int i;
static int firstInterp = 1;
iPtr = (Interp *) ckalloc(sizeof(Interp));
iPtr->result = iPtr->resultSpace;
iPtr->freeProc = 0;
iPtr->errorLine = 0;
Tcl_InitHashTable(&iPtr->commandTable, TCL_STRING_KEYS);
Tcl_InitHashTable(&iPtr->mathFuncTable, TCL_STRING_KEYS);
Tcl_InitHashTable(&iPtr->globalTable, TCL_STRING_KEYS);
iPtr->numLevels = 0;
iPtr->maxNestingDepth = 1000;
iPtr->framePtr = NULL;
iPtr->varFramePtr = NULL;
iPtr->activeTracePtr = NULL;
iPtr->returnCode = TCL_OK;
iPtr->errorInfo = NULL;
iPtr->errorCode = NULL;
iPtr->numEvents = 0;
iPtr->events = NULL;
iPtr->curEvent = 0;
iPtr->curEventNum = 0;
iPtr->revPtr = NULL;
iPtr->historyFirst = NULL;
iPtr->revDisables = 1;
iPtr->evalFirst = iPtr->evalLast = NULL;
iPtr->appendResult = NULL;
iPtr->appendAvl = 0;
iPtr->appendUsed = 0;
for (i = 0; i < NUM_REGEXPS; i++) {
iPtr->patterns[i] = NULL;
iPtr->patLengths[i] = -1;
iPtr->regexps[i] = NULL;
}
strcpy(iPtr->pdFormat, DEFAULT_PD_FORMAT);
iPtr->pdPrec = DEFAULT_PD_PREC;
iPtr->cmdCount = 0;
iPtr->noEval = 0;
iPtr->evalFlags = 0;
iPtr->scriptFile = NULL;
iPtr->flags = 0;
iPtr->tracePtr = NULL;
iPtr->deleteCallbackPtr = NULL;
iPtr->resultSpace[0] = 0;
/*
* Create the built-in commands. Do it here, rather than calling
* Tcl_CreateCommand, because it's faster (there's no need to
* check for a pre-existing command by the same name).
*/
for (cmdInfoPtr = builtInCmds; cmdInfoPtr->name != NULL; cmdInfoPtr++) {
int new;
Tcl_HashEntry *hPtr;
hPtr = Tcl_CreateHashEntry(&iPtr->commandTable,
cmdInfoPtr->name, &new);
if (new) {
cmdPtr = (Command *) ckalloc(sizeof(Command));
cmdPtr->proc = cmdInfoPtr->proc;
cmdPtr->clientData = (ClientData) NULL;
cmdPtr->deleteProc = NULL;
cmdPtr->deleteData = (ClientData) NULL;
Tcl_SetHashValue(hPtr, cmdPtr);
}
}
#ifndef TCL_GENERIC_ONLY
TclSetupEnv((Tcl_Interp *) iPtr);
/*
* The code below causes SIGPIPE (broken pipe) errors to
* be ignored. This is needed so that Tcl processes don't
* die if they create child processes (e.g. using "exec" or
* "open") that terminate prematurely. The signal handler
* is only set up when the first interpreter is created;
* after this the application can override the handler with
* a different one of its own, if it wants.
*/
if (firstInterp) {
(void) signal(SIGPIPE, SIG_IGN);
firstInterp = 0;
}
#endif
Tcl_TraceVar2((Tcl_Interp *) iPtr, "tcl_precision", (char *) NULL,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
TclPrecTraceProc, (ClientData) NULL);
return (Tcl_Interp *) iPtr;
}
/*
*----------------------------------------------------------------------
*
* Tcl_Init --
*
* This procedure is typically invoked by Tcl_AppInit procedures
* to perform additional initialization for a Tcl interpreter,
* such as sourcing the "init.tcl" script.
*
* Results:
* Returns a standard Tcl completion code and sets interp->result
* if there is an error.
*
* Side effects:
* Depends on what's in the init.tcl script.
*
*----------------------------------------------------------------------
*/
int
Tcl_Init(interp)
Tcl_Interp *interp; /* Interpreter to initialize. */
{
static char initCmd[] =
"if [file exists [info library]/init.tcl] {\n\
source [info library]/init.tcl\n\
} else {\n\
set msg \"can't find [info library]/init.tcl; perhaps you \"\n\
append msg \"need to\\ninstall Tcl or set your TCL_LIBRARY \"\n\
append msg \"environment variable?\"\n\
error $msg\n\
}";
return Tcl_Eval(interp, initCmd);
}
/*
*--------------------------------------------------------------
*
* Tcl_CallWhenDeleted --
*
* Arrange for a procedure to be called before a given
* interpreter is deleted.
*
* Results:
* None.
*
* Side effects:
* When Tcl_DeleteInterp is invoked to delete interp,
* proc will be invoked. See the manual entry for
* details.
*
*--------------------------------------------------------------
*/
void
Tcl_CallWhenDeleted(interp, proc, clientData)
Tcl_Interp *interp; /* Interpreter to watch. */
Tcl_InterpDeleteProc *proc; /* Procedure to call when interpreter
* is about to be deleted. */
ClientData clientData; /* One-word value to pass to proc. */
{
DeleteCallback *dcPtr, *prevPtr;
Interp *iPtr = (Interp *) interp;
dcPtr = (DeleteCallback *) ckalloc(sizeof(DeleteCallback));
dcPtr->proc = proc;
dcPtr->clientData = clientData;
dcPtr->nextPtr = NULL;
if (iPtr->deleteCallbackPtr == NULL) {
iPtr->deleteCallbackPtr = dcPtr;
} else {
prevPtr = iPtr->deleteCallbackPtr;
while (prevPtr->nextPtr != NULL) {
prevPtr = prevPtr->nextPtr;
}
prevPtr->nextPtr = dcPtr;
}
}
/*
*--------------------------------------------------------------
*
* Tcl_DontCallWhenDeleted --
*
* Cancel the arrangement for a procedure to be called when
* a given interpreter is deleted.
*
* Results:
* None.
*
* Side effects:
* If proc and clientData were previously registered as a
* callback via Tcl_CallWhenDeleted, they are unregistered.
* If they weren't previously registered then nothing
* happens.
*
*--------------------------------------------------------------
*/
void
Tcl_DontCallWhenDeleted(interp, proc, clientData)
Tcl_Interp *interp; /* Interpreter to watch. */
Tcl_InterpDeleteProc *proc; /* Procedure to call when interpreter
* is about to be deleted. */
ClientData clientData; /* One-word value to pass to proc. */
{
DeleteCallback *prevPtr, *dcPtr;
Interp *iPtr = (Interp *) interp;
for (prevPtr = NULL, dcPtr = iPtr->deleteCallbackPtr;
dcPtr != NULL; prevPtr = dcPtr, dcPtr = dcPtr->nextPtr) {
if ((dcPtr->proc != proc) || (dcPtr->clientData != clientData)) {
continue;
}
if (prevPtr == NULL) {
iPtr->deleteCallbackPtr = dcPtr->nextPtr;
} else {
prevPtr->nextPtr = dcPtr->nextPtr;
}
ckfree((char *) dcPtr);
break;
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_DeleteInterp --
*
* Delete an interpreter and free up all of the resources associated
* with it.
*
* Results:
* None.
*
* Side effects:
* The interpreter is destroyed. The caller should never again
* use the interp token.
*
*----------------------------------------------------------------------
*/
void
Tcl_DeleteInterp(interp)
Tcl_Interp *interp; /* Token for command interpreter (returned
* by a previous call to Tcl_CreateInterp). */
{
Interp *iPtr = (Interp *) interp;
Tcl_HashEntry *hPtr;
Tcl_HashSearch search;
register Command *cmdPtr;
DeleteCallback *dcPtr;
int i;
/*
* If the interpreter is in use, delay the deletion until later.
*/
iPtr->flags |= DELETED;
if (iPtr->numLevels != 0) {
return;
}
/*
* Invoke deletion callbacks.
*/
while (iPtr->deleteCallbackPtr != NULL) {
dcPtr = iPtr->deleteCallbackPtr;
iPtr->deleteCallbackPtr = dcPtr->nextPtr;
(*dcPtr->proc)(dcPtr->clientData, interp);
ckfree((char *) dcPtr);
}
/*
* Free up any remaining resources associated with the
* interpreter.
*/
for (hPtr = Tcl_FirstHashEntry(&iPtr->commandTable, &search);
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
cmdPtr = (Command *) Tcl_GetHashValue(hPtr);
if (cmdPtr->deleteProc != NULL) {
(*cmdPtr->deleteProc)(cmdPtr->deleteData);
}
ckfree((char *) cmdPtr);
}
Tcl_DeleteHashTable(&iPtr->commandTable);
for (hPtr = Tcl_FirstHashEntry(&iPtr->mathFuncTable, &search);
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
ckfree((char *) Tcl_GetHashValue(hPtr));
}
Tcl_DeleteHashTable(&iPtr->mathFuncTable);
TclDeleteVars(iPtr, &iPtr->globalTable);
/*
* Free up the result *after* deleting variables, since variable
* deletion could have transferred ownership of the result string
* to Tcl.
*/
Tcl_FreeResult(interp);
if (iPtr->errorInfo != NULL) {
ckfree(iPtr->errorInfo);
}
if (iPtr->errorCode != NULL) {
ckfree(iPtr->errorCode);
}
if (iPtr->events != NULL) {
int i;
for (i = 0; i < iPtr->numEvents; i++) {
ckfree(iPtr->events[i].command);
}
ckfree((char *) iPtr->events);
}
while (iPtr->revPtr != NULL) {
HistoryRev *nextPtr = iPtr->revPtr->nextPtr;
ckfree((char *) iPtr->revPtr);
iPtr->revPtr = nextPtr;
}
if (iPtr->appendResult != NULL) {
ckfree(iPtr->appendResult);
}
for (i = 0; i < NUM_REGEXPS; i++) {
if (iPtr->patterns[i] == NULL) {
break;
}
ckfree(iPtr->patterns[i]);
ckfree((char *) iPtr->regexps[i]);
}
while (iPtr->tracePtr != NULL) {
Trace *nextPtr = iPtr->tracePtr->nextPtr;
ckfree((char *) iPtr->tracePtr);
iPtr->tracePtr = nextPtr;
}
ckfree((char *) iPtr);
}
/*
*----------------------------------------------------------------------
*
* Tcl_CreateCommand --
*
* Define a new command in a command table.
*
* Results:
* None.
*
* Side effects:
* If a command named cmdName already exists for interp, it is
* deleted. In the future, when cmdName is seen as the name of
* a command by Tcl_Eval, proc will be called. When the command
* is deleted from the table, deleteProc will be called. See the
* manual entry for details on the calling sequence.
*
*----------------------------------------------------------------------
*/
void
Tcl_CreateCommand(interp, cmdName, proc, clientData, deleteProc)
Tcl_Interp *interp; /* Token for command interpreter (returned
* by a previous call to Tcl_CreateInterp). */
char *cmdName; /* Name of command. */
Tcl_CmdProc *proc; /* Command procedure to associate with
* cmdName. */
ClientData clientData; /* Arbitrary one-word value to pass to proc. */
Tcl_CmdDeleteProc *deleteProc;
/* If not NULL, gives a procedure to call when
* this command is deleted. */
{
Interp *iPtr = (Interp *) interp;
register Command *cmdPtr;
Tcl_HashEntry *hPtr;
int new;
hPtr = Tcl_CreateHashEntry(&iPtr->commandTable, cmdName, &new);
if (!new) {
/*
* Command already exists: delete the old one.
*/
cmdPtr = (Command *) Tcl_GetHashValue(hPtr);
if (cmdPtr->deleteProc != NULL) {
(*cmdPtr->deleteProc)(cmdPtr->deleteData);
}
} else {
cmdPtr = (Command *) ckalloc(sizeof(Command));
Tcl_SetHashValue(hPtr, cmdPtr);
}
cmdPtr->proc = proc;
cmdPtr->clientData = clientData;
cmdPtr->deleteProc = deleteProc;
cmdPtr->deleteData = clientData;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetCommandInfo --
*
* Modifies various information about a Tcl command.
*
* Results:
* If cmdName exists in interp, then the information at *infoPtr
* is stored with the command in place of the current information
* and 1 is returned. If the command doesn't exist then 0 is
* returned.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetCommandInfo(interp, cmdName, infoPtr)
Tcl_Interp *interp; /* Interpreter in which to look
* for command. */
char *cmdName; /* Name of desired command. */
Tcl_CmdInfo *infoPtr; /* Where to store information about
* command. */
{
Tcl_HashEntry *hPtr;
Command *cmdPtr;
hPtr = Tcl_FindHashEntry(&((Interp *) interp)->commandTable, cmdName);
if (hPtr == NULL) {
return 0;
}
cmdPtr = (Command *) Tcl_GetHashValue(hPtr);
cmdPtr->proc = infoPtr->proc;
cmdPtr->clientData = infoPtr->clientData;
cmdPtr->deleteProc = infoPtr->deleteProc;
cmdPtr->deleteData = infoPtr->deleteData;
return 1;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetCommandInfo --
*
* Returns various information about a Tcl command.
*
* Results:
* If cmdName exists in interp, then *infoPtr is modified to
* hold information about cmdName and 1 is returned. If the
* command doesn't exist then 0 is returned and *infoPtr isn't
* modified.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tcl_GetCommandInfo(interp, cmdName, infoPtr)
Tcl_Interp *interp; /* Interpreter in which to look
* for command. */
char *cmdName; /* Name of desired command. */
Tcl_CmdInfo *infoPtr; /* Where to store information about
* command. */
{
Tcl_HashEntry *hPtr;
Command *cmdPtr;
hPtr = Tcl_FindHashEntry(&((Interp *) interp)->commandTable, cmdName);
if (hPtr == NULL) {
return 0;
}
cmdPtr = (Command *) Tcl_GetHashValue(hPtr);
infoPtr->proc = cmdPtr->proc;
infoPtr->clientData = cmdPtr->clientData;
infoPtr->deleteProc = cmdPtr->deleteProc;
infoPtr->deleteData = cmdPtr->deleteData;
return 1;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DeleteCommand --
*
* Remove the given command from the given interpreter.
*
* Results:
* 0 is returned if the command was deleted successfully.
* -1 is returned if there didn't exist a command by that
* name.
*
* Side effects:
* CmdName will no longer be recognized as a valid command for
* interp.
*
*----------------------------------------------------------------------
*/
int
Tcl_DeleteCommand(interp, cmdName)
Tcl_Interp *interp; /* Token for command interpreter (returned
* by a previous call to Tcl_CreateInterp). */
char *cmdName; /* Name of command to remove. */
{
Interp *iPtr = (Interp *) interp;
Tcl_HashEntry *hPtr;
Command *cmdPtr;
hPtr = Tcl_FindHashEntry(&iPtr->commandTable, cmdName);
if (hPtr == NULL) {
return -1;
}
cmdPtr = (Command *) Tcl_GetHashValue(hPtr);
if (cmdPtr->deleteProc != NULL) {
(*cmdPtr->deleteProc)(cmdPtr->deleteData);
}
ckfree((char *) cmdPtr);
Tcl_DeleteHashEntry(hPtr);
return 0;
}
/*
*-----------------------------------------------------------------
*
* Tcl_Eval --
*
* Parse and execute a command in the Tcl language.
*
* Results:
* The return value is one of the return codes defined in tcl.hd
* (such as TCL_OK), and interp->result contains a string value
* to supplement the return code. The value of interp->result
* will persist only until the next call to Tcl_Eval: copy it or
* lose it! *TermPtr is filled in with the character just after
* the last one that was part of the command (usually a NULL
* character or a closing bracket).
*
* Side effects:
* Almost certainly; depends on the command.
*
*-----------------------------------------------------------------
*/
int
Tcl_Eval(interp, cmd)
Tcl_Interp *interp; /* Token for command interpreter (returned
* by a previous call to Tcl_CreateInterp). */
char *cmd; /* Pointer to TCL command to interpret. */
{
/*
* The storage immediately below is used to generate a copy
* of the command, after all argument substitutions. Pv will
* contain the argv values passed to the command procedure.
*/
# define NUM_CHARS 200
char copyStorage[NUM_CHARS];
ParseValue pv;
char *oldBuffer;
/*
* This procedure generates an (argv, argc) array for the command,
* It starts out with stack-allocated space but uses dynamically-
* allocated storage to increase it if needed.
*/
# define NUM_ARGS 10
char *(argStorage[NUM_ARGS]);
char **argv = argStorage;
int argc;
int argSize = NUM_ARGS;
register char *src; /* Points to current character
* in cmd. */
char termChar; /* Return when this character is found
* (either ']' or '\0'). Zero means
* that newlines terminate commands. */
int flags; /* Interp->evalFlags value when the
* procedure was called. */
int result; /* Return value. */
register Interp *iPtr = (Interp *) interp;
Tcl_HashEntry *hPtr;
Command *cmdPtr;
char *termPtr; /* Contains character just after the
* last one in the command. */
char *cmdStart; /* Points to first non-blank char. in
* command (used in calling trace
* procedures). */
char *ellipsis = ""; /* Used in setting errorInfo variable;
* set to "..." to indicate that not
* all of offending command is included
* in errorInfo. "" means that the
* command is all there. */
register Trace *tracePtr;
/*
* Initialize the result to an empty string and clear out any
* error information. This makes sure that we return an empty
* result if there are no commands in the command string.
*/
Tcl_FreeResult((Tcl_Interp *) iPtr);
iPtr->result = iPtr->resultSpace;
iPtr->resultSpace[0] = 0;
result = TCL_OK;
/*
* Initialize the area in which command copies will be assembled.
*/
pv.buffer = copyStorage;
pv.end = copyStorage + NUM_CHARS - 1;
pv.expandProc = TclExpandParseValue;
pv.clientData = (ClientData) NULL;
src = cmd;
flags = iPtr->evalFlags;
iPtr->evalFlags = 0;
if (flags & TCL_BRACKET_TERM) {
termChar = ']';
} else {
termChar = 0;
}
termPtr = src;
cmdStart = src;
/*
* Check depth of nested calls to Tcl_Eval: if this gets too large,
* it's probably because of an infinite loop somewhere.
*/
iPtr->numLevels++;
if (iPtr->numLevels > iPtr->maxNestingDepth) {
iPtr->numLevels--;
iPtr->result = "too many nested calls to Tcl_Eval (infinite loop?)";
iPtr->termPtr = termPtr;
return TCL_ERROR;
}
/*
* There can be many sub-commands (separated by semi-colons or
* newlines) in one command string. This outer loop iterates over
* individual commands.
*/
while (*src != termChar) {
iPtr->flags &= ~(ERR_IN_PROGRESS | ERROR_CODE_SET);
/*
* Skim off leading white space and semi-colons, and skip
* comments.
*/
while (1) {
register char c = *src;
if ((CHAR_TYPE(c) != TCL_SPACE) && (c != ';') && (c != '\n')) {
break;
}
src += 1;
}
if (*src == '#') {
for (src++; *src != 0; src++) {
if ((*src == '\n') && (src[-1] != '\\')) {
src++;
break;
}
}
continue;
}
cmdStart = src;
/*
* Parse the words of the command, generating the argc and
* argv for the command procedure. May have to call
* TclParseWords several times, expanding the argv array
* between calls.
*/
pv.next = oldBuffer = pv.buffer;
argc = 0;
while (1) {
int newArgs, maxArgs;
char **newArgv;
int i;
/*
* Note: the "- 2" below guarantees that we won't use the
* last two argv slots here. One is for a NULL pointer to
* mark the end of the list, and the other is to leave room
* for inserting the command name "unknown" as the first
* argument (see below).
*/
maxArgs = argSize - argc - 2;
result = TclParseWords((Tcl_Interp *) iPtr, src, flags,
maxArgs, &termPtr, &newArgs, &argv[argc], &pv);
src = termPtr;
if (result != TCL_OK) {
ellipsis = "...";
goto done;
}
/*
* Careful! Buffer space may have gotten reallocated while
* parsing words. If this happened, be sure to update all
* of the older argv pointers to refer to the new space.
*/
if (oldBuffer != pv.buffer) {
int i;
for (i = 0; i < argc; i++) {
argv[i] = pv.buffer + (argv[i] - oldBuffer);
}
oldBuffer = pv.buffer;
}
argc += newArgs;
if (newArgs < maxArgs) {
argv[argc] = (char *) NULL;
break;
}
/*
* Args didn't all fit in the current array. Make it bigger.
*/
argSize *= 2;
newArgv = (char **)
ckalloc((unsigned) argSize * sizeof(char *));
for (i = 0; i < argc; i++) {
newArgv[i] = argv[i];
}
if (argv != argStorage) {
ckfree((char *) argv);
}
argv = newArgv;
}
/*
* If this is an empty command (or if we're just parsing
* commands without evaluating them), then just skip to the
* next command.
*/
if ((argc == 0) || iPtr->noEval) {
continue;
}
argv[argc] = NULL;
/*
* Save information for the history module, if needed.
*/
if (flags & TCL_RECORD_BOUNDS) {
iPtr->evalFirst = cmdStart;
iPtr->evalLast = src-1;
}
/*
* Find the procedure to execute this command. If there isn't
* one, then see if there is a command "unknown". If so,
* invoke it instead, passing it the words of the original
* command as arguments.
*/
hPtr = Tcl_FindHashEntry(&iPtr->commandTable, argv[0]);
if (hPtr == NULL) {
int i;
hPtr = Tcl_FindHashEntry(&iPtr->commandTable, "unknown");
if (hPtr == NULL) {
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "invalid command name: \"",
argv[0], "\"", (char *) NULL);
result = TCL_ERROR;
goto done;
}
for (i = argc; i >= 0; i--) {
argv[i+1] = argv[i];
}
argv[0] = "unknown";
argc++;
}
cmdPtr = (Command *) Tcl_GetHashValue(hPtr);
/*
* Call trace procedures, if any.
*/
for (tracePtr = iPtr->tracePtr; tracePtr != NULL;
tracePtr = tracePtr->nextPtr) {
char saved;
if (tracePtr->level < iPtr->numLevels) {
continue;
}
saved = *src;
*src = 0;
(*tracePtr->proc)(tracePtr->clientData, interp, iPtr->numLevels,
cmdStart, cmdPtr->proc, cmdPtr->clientData, argc, argv);
*src = saved;
}
/*
* At long last, invoke the command procedure. Reset the
* result to its default empty value first (it could have
* gotten changed by earlier commands in the same command
* string).
*/
iPtr->cmdCount++;
Tcl_FreeResult(iPtr);
iPtr->result = iPtr->resultSpace;
iPtr->resultSpace[0] = 0;
result = (*cmdPtr->proc)(cmdPtr->clientData, interp, argc, argv);
if (tcl_AsyncReady) {
result = Tcl_AsyncInvoke(interp, result);
}
if (result != TCL_OK) {
break;
}
}
/*
* Free up any extra resources that were allocated.
*/
done:
if (pv.buffer != copyStorage) {
ckfree((char *) pv.buffer);
}
if (argv != argStorage) {
ckfree((char *) argv);
}
iPtr->numLevels--;
if (iPtr->numLevels == 0) {
if (result == TCL_RETURN) {
result = TCL_OK;
}
if ((result != TCL_OK) && (result != TCL_ERROR)) {
Tcl_ResetResult(interp);
if (result == TCL_BREAK) {
iPtr->result = "invoked \"break\" outside of a loop";
} else if (result == TCL_CONTINUE) {
iPtr->result = "invoked \"continue\" outside of a loop";
} else {
iPtr->result = iPtr->resultSpace;
sprintf(iPtr->resultSpace, "command returned bad code: %d",
result);
}
result = TCL_ERROR;
}
if (iPtr->flags & DELETED) {
Tcl_DeleteInterp(interp);
}
}
/*
* If an error occurred, record information about what was being
* executed when the error occurred.
*/
if ((result == TCL_ERROR) && !(iPtr->flags & ERR_ALREADY_LOGGED)) {
int numChars;
register char *p;
/*
* Compute the line number where the error occurred.
*/
iPtr->errorLine = 1;
for (p = cmd; p != cmdStart; p++) {
if (*p == '\n') {
iPtr->errorLine++;
}
}
for ( ; isspace(UCHAR(*p)) || (*p == ';'); p++) {
if (*p == '\n') {
iPtr->errorLine++;
}
}
/*
* Figure out how much of the command to print in the error
* message (up to a certain number of characters, or up to
* the first new-line).
*/
numChars = src - cmdStart;
if (numChars > (NUM_CHARS-50)) {
numChars = NUM_CHARS-50;
ellipsis = " ...";
}
if (!(iPtr->flags & ERR_IN_PROGRESS)) {
sprintf(copyStorage, "\n while executing\n\"%.*s%s\"",
numChars, cmdStart, ellipsis);
} else {
sprintf(copyStorage, "\n invoked from within\n\"%.*s%s\"",
numChars, cmdStart, ellipsis);
}
Tcl_AddErrorInfo(interp, copyStorage);
iPtr->flags &= ~ERR_ALREADY_LOGGED;
} else {
iPtr->flags &= ~ERR_ALREADY_LOGGED;
}
iPtr->termPtr = termPtr;
return result;
}
/*
*----------------------------------------------------------------------
*
* Tcl_CreateTrace --
*
* Arrange for a procedure to be called to trace command execution.
*
* Results:
* The return value is a token for the trace, which may be passed
* to Tcl_DeleteTrace to eliminate the trace.
*
* Side effects:
* From now on, proc will be called just before a command procedure
* is called to execute a Tcl command. Calls to proc will have the
* following form:
*
* void
* proc(clientData, interp, level, command, cmdProc, cmdClientData,
* argc, argv)
* ClientData clientData;
* Tcl_Interp *interp;
* int level;
* char *command;
* int (*cmdProc)();
* ClientData cmdClientData;
* int argc;
* char **argv;
* {
* }
*
* The clientData and interp arguments to proc will be the same
* as the corresponding arguments to this procedure. Level gives
* the nesting level of command interpretation for this interpreter
* (0 corresponds to top level). Command gives the ASCII text of
* the raw command, cmdProc and cmdClientData give the procedure that
* will be called to process the command and the ClientData value it
* will receive, and argc and argv give the arguments to the
* command, after any argument parsing and substitution. Proc
* does not return a value.
*
*----------------------------------------------------------------------
*/
Tcl_Trace
Tcl_CreateTrace(interp, level, proc, clientData)
Tcl_Interp *interp; /* Interpreter in which to create the trace. */
int level; /* Only call proc for commands at nesting level
* <= level (1 => top level). */
Tcl_CmdTraceProc *proc; /* Procedure to call before executing each
* command. */
ClientData clientData; /* Arbitrary one-word value to pass to proc. */
{
register Trace *tracePtr;
register Interp *iPtr = (Interp *) interp;
tracePtr = (Trace *) ckalloc(sizeof(Trace));
tracePtr->level = level;
tracePtr->proc = proc;
tracePtr->clientData = clientData;
tracePtr->nextPtr = iPtr->tracePtr;
iPtr->tracePtr = tracePtr;
return (Tcl_Trace) tracePtr;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DeleteTrace --
*
* Remove a trace.
*
* Results:
* None.
*
* Side effects:
* From now on there will be no more calls to the procedure given
* in trace.
*
*----------------------------------------------------------------------
*/
void
Tcl_DeleteTrace(interp, trace)
Tcl_Interp *interp; /* Interpreter that contains trace. */
Tcl_Trace trace; /* Token for trace (returned previously by
* Tcl_CreateTrace). */
{
register Interp *iPtr = (Interp *) interp;
register Trace *tracePtr = (Trace *) trace;
register Trace *tracePtr2;
if (iPtr->tracePtr == tracePtr) {
iPtr->tracePtr = tracePtr->nextPtr;
ckfree((char *) tracePtr);
} else {
for (tracePtr2 = iPtr->tracePtr; tracePtr2 != NULL;
tracePtr2 = tracePtr2->nextPtr) {
if (tracePtr2->nextPtr == tracePtr) {
tracePtr2->nextPtr = tracePtr->nextPtr;
ckfree((char *) tracePtr);
return;
}
}
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_AddErrorInfo --
*
* Add information to a message being accumulated that describes
* the current error.
*
* Results:
* None.
*
* Side effects:
* The contents of message are added to the "errorInfo" variable.
* If Tcl_Eval has been called since the current value of errorInfo
* was set, errorInfo is cleared before adding the new message.
*
*----------------------------------------------------------------------
*/
void
Tcl_AddErrorInfo(interp, message)
Tcl_Interp *interp; /* Interpreter to which error information
* pertains. */
char *message; /* Message to record. */
{
register Interp *iPtr = (Interp *) interp;
/*
* If an error is already being logged, then the new errorInfo
* is the concatenation of the old info and the new message.
* If this is the first piece of info for the error, then the
* new errorInfo is the concatenation of the message in
* interp->result and the new message.
*/
if (!(iPtr->flags & ERR_IN_PROGRESS)) {
Tcl_SetVar2(interp, "errorInfo", (char *) NULL, interp->result,
TCL_GLOBAL_ONLY);
iPtr->flags |= ERR_IN_PROGRESS;
/*
* If the errorCode variable wasn't set by the code that generated
* the error, set it to "NONE".
*/
if (!(iPtr->flags & ERROR_CODE_SET)) {
(void) Tcl_SetVar2(interp, "errorCode", (char *) NULL, "NONE",
TCL_GLOBAL_ONLY);
}
}
Tcl_SetVar2(interp, "errorInfo", (char *) NULL, message,
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE);
}
/*
*----------------------------------------------------------------------
*
* Tcl_VarEval --
*
* Given a variable number of string arguments, concatenate them
* all together and execute the result as a Tcl command.
*
* Results:
* A standard Tcl return result. An error message or other
* result may be left in interp->result.
*
* Side effects:
* Depends on what was done by the command.
*
*----------------------------------------------------------------------
*/
/* VARARGS2 */ /* ARGSUSED */
int
#ifndef lint
Tcl_VarEval(va_alist)
#else
Tcl_VarEval(iPtr, p, va_alist)
Tcl_Interp *iPtr; /* Interpreter in which to execute command. */
char *p; /* One or more strings to concatenate,
* terminated with a NULL string. */
#endif
va_dcl
{
va_list argList;
#define FIXED_SIZE 200
char fixedSpace[FIXED_SIZE+1];
int spaceAvl, spaceUsed, length;
char *string, *cmd;
Tcl_Interp *interp;
int result;
/*
* Copy the strings one after the other into a single larger
* string. Use stack-allocated space for small commands, but if
* the command gets too large than call ckalloc to create the
* space.
*/
va_start(argList);
interp = va_arg(argList, Tcl_Interp *);
spaceAvl = FIXED_SIZE;
spaceUsed = 0;
cmd = fixedSpace;
while (1) {
string = va_arg(argList, char *);
if (string == NULL) {
break;
}
length = strlen(string);
if ((spaceUsed + length) > spaceAvl) {
char *new;
spaceAvl = spaceUsed + length;
spaceAvl += spaceAvl/2;
new = ckalloc((unsigned) spaceAvl);
memcpy((VOID *) new, (VOID *) cmd, spaceUsed);
if (cmd != fixedSpace) {
ckfree(cmd);
}
cmd = new;
}
strcpy(cmd + spaceUsed, string);
spaceUsed += length;
}
va_end(argList);
cmd[spaceUsed] = '\0';
result = Tcl_Eval(interp, cmd);
if (cmd != fixedSpace) {
ckfree(cmd);
}
return result;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GlobalEval --
*
* Evaluate a command at global level in an interpreter.
*
* Results:
* A standard Tcl result is returned, and interp->result is
* modified accordingly.
*
* Side effects:
* The command string is executed in interp, and the execution
* is carried out in the variable context of global level (no
* procedures active), just as if an "uplevel #0" command were
* being executed.
*
*----------------------------------------------------------------------
*/
int
Tcl_GlobalEval(interp, command)
Tcl_Interp *interp; /* Interpreter in which to evaluate command. */
char *command; /* Command to evaluate. */
{
register Interp *iPtr = (Interp *) interp;
int result;
CallFrame *savedVarFramePtr;
savedVarFramePtr = iPtr->varFramePtr;
iPtr->varFramePtr = NULL;
result = Tcl_Eval(interp, command);
iPtr->varFramePtr = savedVarFramePtr;
return result;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetRecursionLimit --
*
* Set the maximum number of recursive calls that may be active
* for an interpreter at once.
*
* Results:
* The return value is the old limit on nesting for interp.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetRecursionLimit(interp, depth)
Tcl_Interp *interp; /* Interpreter whose nesting limit
* is to be set. */
int depth; /* New value for maximimum depth. */
{
Interp *iPtr = (Interp *) interp;
int old;
old = iPtr->maxNestingDepth;
if (depth > 0) {
iPtr->maxNestingDepth = depth;
}
return old;
}
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