/* * tclRegexp.c -- * * This file contains the public interfaces to the Tcl regular * expression mechanism. * * Copyright (c) 1998 by Sun Microsystems, Inc. * Copyright (c) 1998-1999 by Scriptics Corporation. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tclRegexp.c,v 1.16 2004/09/29 22:17:30 dkf Exp $ */ #include "tclInt.h" #include "tclRegexp.h" /* *---------------------------------------------------------------------- * The routines in this file use Henry Spencer's regular expression * package contained in the following additional source files: * * regc_color.c regc_cvec.c regc_lex.c * regc_nfa.c regcomp.c regcustom.h * rege_dfa.c regerror.c regerrs.h * regex.h regexec.c regfree.c * regfronts.c regguts.h * * Copyright (c) 1998 Henry Spencer. All rights reserved. * * Development of this software was funded, in part, by Cray Research Inc., * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics * Corporation, none of whom are responsible for the results. The author * thanks all of them. * * Redistribution and use in source and binary forms -- with or without * modification -- are permitted for any purpose, provided that * redistributions in source form retain this entire copyright notice and * indicate the origin and nature of any modifications. * * I'd appreciate being given credit for this package in the documentation * of software which uses it, but that is not a requirement. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL * HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * *** NOTE: this code has been altered slightly for use in Tcl: *** * *** 1. Names have been changed, e.g. from re_comp to *** * *** TclRegComp, to avoid clashes with other *** * *** regexp implementations used by applications. *** */ /* * Thread local storage used to maintain a per-thread cache of compiled * regular expressions. */ #define NUM_REGEXPS 30 typedef struct ThreadSpecificData { int initialized; /* Set to 1 when the module is initialized. */ char *patterns[NUM_REGEXPS];/* Strings corresponding to compiled * regular expression patterns. NULL * means that this slot isn't used. * Malloc-ed. */ int patLengths[NUM_REGEXPS];/* Number of non-null characters in * corresponding entry in patterns. * -1 means entry isn't used. */ struct TclRegexp *regexps[NUM_REGEXPS]; /* Compiled forms of above strings. Also * malloc-ed, or NULL if not in use yet. */ } ThreadSpecificData; static Tcl_ThreadDataKey dataKey; /* * Declarations for functions used only in this file. */ static TclRegexp * CompileRegexp _ANSI_ARGS_((Tcl_Interp *interp, CONST char *pattern, int length, int flags)); static void DupRegexpInternalRep _ANSI_ARGS_((Tcl_Obj *srcPtr, Tcl_Obj *copyPtr)); static void FinalizeRegexp _ANSI_ARGS_((ClientData clientData)); static void FreeRegexp _ANSI_ARGS_((TclRegexp *regexpPtr)); static void FreeRegexpInternalRep _ANSI_ARGS_((Tcl_Obj *objPtr)); static int RegExpExecUniChar _ANSI_ARGS_((Tcl_Interp *interp, Tcl_RegExp re, CONST Tcl_UniChar *uniString, int numChars, int nmatches, int flags)); static int SetRegexpFromAny _ANSI_ARGS_((Tcl_Interp *interp, Tcl_Obj *objPtr)); /* * The regular expression Tcl object type. This serves as a cache * of the compiled form of the regular expression. */ Tcl_ObjType tclRegexpType = { "regexp", /* name */ FreeRegexpInternalRep, /* freeIntRepProc */ DupRegexpInternalRep, /* dupIntRepProc */ NULL, /* updateStringProc */ SetRegexpFromAny /* setFromAnyProc */ }; /* *---------------------------------------------------------------------- * * Tcl_RegExpCompile -- * * Compile a regular expression into a form suitable for fast * matching. This procedure is DEPRECATED in favor of the * object version of the command. * * Results: * The return value is a pointer to the compiled form of string, * suitable for passing to Tcl_RegExpExec. This compiled form * is only valid up until the next call to this procedure, so * don't keep these around for a long time! If an error occurred * while compiling the pattern, then NULL is returned and an error * message is left in the interp's result. * * Side effects: * Updates the cache of compiled regexps. * *---------------------------------------------------------------------- */ Tcl_RegExp Tcl_RegExpCompile(interp, string) Tcl_Interp *interp; /* For use in error reporting and * to access the interp regexp cache. */ CONST char *string; /* String for which to produce * compiled regular expression. */ { return (Tcl_RegExp) CompileRegexp(interp, string, (int) strlen(string), REG_ADVANCED); } /* *---------------------------------------------------------------------- * * Tcl_RegExpExec -- * * Execute the regular expression matcher using a compiled form * of a regular expression and save information about any match * that is found. * * Results: * If an error occurs during the matching operation then -1 * is returned and the interp's result contains an error message. * Otherwise the return value is 1 if a matching range is * found and 0 if there is no matching range. * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tcl_RegExpExec(interp, re, string, start) Tcl_Interp *interp; /* Interpreter to use for error reporting. */ Tcl_RegExp re; /* Compiled regular expression; must have * been returned by previous call to * Tcl_GetRegExpFromObj. */ CONST char *string; /* String against which to match re. */ CONST char *start; /* If string is part of a larger string, * this identifies beginning of larger * string, so that "^" won't match. */ { int flags, result, numChars; TclRegexp *regexp = (TclRegexp *)re; Tcl_DString ds; CONST Tcl_UniChar *ustr; /* * If the starting point is offset from the beginning of the buffer, * then we need to tell the regexp engine not to match "^". */ if (string > start) { flags = REG_NOTBOL; } else { flags = 0; } /* * Remember the string for use by Tcl_RegExpRange(). */ regexp->string = string; regexp->objPtr = NULL; /* * Convert the string to Unicode and perform the match. */ Tcl_DStringInit(&ds); ustr = Tcl_UtfToUniCharDString(string, -1, &ds); numChars = Tcl_DStringLength(&ds) / sizeof(Tcl_UniChar); result = RegExpExecUniChar(interp, re, ustr, numChars, -1 /* nmatches */, flags); Tcl_DStringFree(&ds); return result; } /* *--------------------------------------------------------------------------- * * Tcl_RegExpRange -- * * Returns pointers describing the range of a regular expression match, * or one of the subranges within the match. * * Results: * The variables at *startPtr and *endPtr are modified to hold the * addresses of the endpoints of the range given by index. If the * specified range doesn't exist then NULLs are returned. * * Side effects: * None. * *--------------------------------------------------------------------------- */ void Tcl_RegExpRange(re, index, startPtr, endPtr) Tcl_RegExp re; /* Compiled regular expression that has * been passed to Tcl_RegExpExec. */ int index; /* 0 means give the range of the entire * match, > 0 means give the range of * a matching subrange. */ CONST char **startPtr; /* Store address of first character in * (sub-) range here. */ CONST char **endPtr; /* Store address of character just after last * in (sub-) range here. */ { TclRegexp *regexpPtr = (TclRegexp *) re; CONST char *string; if ((size_t) index > regexpPtr->re.re_nsub) { *startPtr = *endPtr = NULL; } else if (regexpPtr->matches[index].rm_so < 0) { *startPtr = *endPtr = NULL; } else { if (regexpPtr->objPtr) { string = Tcl_GetString(regexpPtr->objPtr); } else { string = regexpPtr->string; } *startPtr = Tcl_UtfAtIndex(string, regexpPtr->matches[index].rm_so); *endPtr = Tcl_UtfAtIndex(string, regexpPtr->matches[index].rm_eo); } } /* *--------------------------------------------------------------------------- * * RegExpExecUniChar -- * * Execute the regular expression matcher using a compiled form of a * regular expression and save information about any match that is * found. * * Results: * If an error occurs during the matching operation then -1 is * returned and an error message is left in interp's result. * Otherwise the return value is 1 if a matching range was found or * 0 if there was no matching range. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int RegExpExecUniChar(interp, re, wString, numChars, nmatches, flags) Tcl_Interp *interp; /* Interpreter to use for error reporting. */ Tcl_RegExp re; /* Compiled regular expression; returned by * a previous call to Tcl_GetRegExpFromObj */ CONST Tcl_UniChar *wString; /* String against which to match re. */ int numChars; /* Length of Tcl_UniChar string (must * be >= 0). */ int nmatches; /* How many subexpression matches (counting * the whole match as subexpression 0) are * of interest. -1 means "don't know". */ int flags; /* Regular expression flags. */ { int status; TclRegexp *regexpPtr = (TclRegexp *) re; size_t last = regexpPtr->re.re_nsub + 1; size_t nm = last; if (nmatches >= 0 && (size_t) nmatches < nm) { nm = (size_t) nmatches; } status = TclReExec(®expPtr->re, wString, (size_t) numChars, ®expPtr->details, nm, regexpPtr->matches, flags); /* * Check for errors. */ if (status != REG_OKAY) { if (status == REG_NOMATCH) { return 0; } if (interp != NULL) { TclRegError(interp, "error while matching regular expression: ", status); } return -1; } return 1; } /* *--------------------------------------------------------------------------- * * TclRegExpRangeUniChar -- * * Returns pointers describing the range of a regular expression match, * or one of the subranges within the match, or the hypothetical range * represented by the rm_extend field of the rm_detail_t. * * Results: * The variables at *startPtr and *endPtr are modified to hold the * offsets of the endpoints of the range given by index. If the * specified range doesn't exist then -1s are supplied. * * Side effects: * None. * *--------------------------------------------------------------------------- */ void TclRegExpRangeUniChar(re, index, startPtr, endPtr) Tcl_RegExp re; /* Compiled regular expression that has * been passed to Tcl_RegExpExec. */ int index; /* 0 means give the range of the entire * match, > 0 means give the range of * a matching subrange, -1 means the * range of the rm_extend field. */ int *startPtr; /* Store address of first character in * (sub-) range here. */ int *endPtr; /* Store address of character just after last * in (sub-) range here. */ { TclRegexp *regexpPtr = (TclRegexp *) re; if ((regexpPtr->flags®_EXPECT) && index == -1) { *startPtr = regexpPtr->details.rm_extend.rm_so; *endPtr = regexpPtr->details.rm_extend.rm_eo; } else if ((size_t) index > regexpPtr->re.re_nsub) { *startPtr = -1; *endPtr = -1; } else { *startPtr = regexpPtr->matches[index].rm_so; *endPtr = regexpPtr->matches[index].rm_eo; } } /* *---------------------------------------------------------------------- * * Tcl_RegExpMatch -- * * See if a string matches a regular expression. * * Results: * If an error occurs during the matching operation then -1 * is returned and the interp's result contains an error message. * Otherwise the return value is 1 if "string" matches "pattern" * and 0 otherwise. * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tcl_RegExpMatch(interp, string, pattern) Tcl_Interp *interp; /* Used for error reporting. May be NULL. */ CONST char *string; /* String. */ CONST char *pattern; /* Regular expression to match against * string. */ { Tcl_RegExp re; re = Tcl_RegExpCompile(interp, pattern); if (re == NULL) { return -1; } return Tcl_RegExpExec(interp, re, string, string); } /* *---------------------------------------------------------------------- * * Tcl_RegExpExecObj -- * * Execute a precompiled regexp against the given object. * * Results: * If an error occurs during the matching operation then -1 * is returned and the interp's result contains an error message. * Otherwise the return value is 1 if "string" matches "pattern" * and 0 otherwise. * * Side effects: * Converts the object to a Unicode object. * *---------------------------------------------------------------------- */ int Tcl_RegExpExecObj(interp, re, objPtr, offset, nmatches, flags) Tcl_Interp *interp; /* Interpreter to use for error reporting. */ Tcl_RegExp re; /* Compiled regular expression; must have * been returned by previous call to * Tcl_GetRegExpFromObj. */ Tcl_Obj *objPtr; /* String against which to match re. */ int offset; /* Character index that marks where matching * should begin. */ int nmatches; /* How many subexpression matches (counting * the whole match as subexpression 0) are * of interest. -1 means all of them. */ int flags; /* Regular expression execution flags. */ { TclRegexp *regexpPtr = (TclRegexp *) re; Tcl_UniChar *udata; int length; /* * Save the target object so we can extract strings from it later. */ regexpPtr->string = NULL; regexpPtr->objPtr = objPtr; udata = Tcl_GetUnicodeFromObj(objPtr, &length); if (offset > length) { offset = length; } udata += offset; length -= offset; return RegExpExecUniChar(interp, re, udata, length, nmatches, flags); } /* *---------------------------------------------------------------------- * * Tcl_RegExpMatchObj -- * * See if an object matches a regular expression. * * Results: * If an error occurs during the matching operation then -1 * is returned and the interp's result contains an error message. * Otherwise the return value is 1 if "string" matches "pattern" * and 0 otherwise. * * Side effects: * Changes the internal rep of the pattern and string objects. * *---------------------------------------------------------------------- */ int Tcl_RegExpMatchObj(interp, stringObj, patternObj) Tcl_Interp *interp; /* Used for error reporting. May be NULL. */ Tcl_Obj *stringObj; /* Object containing the String to search. */ Tcl_Obj *patternObj; /* Regular expression to match against * string. */ { Tcl_RegExp re; re = Tcl_GetRegExpFromObj(interp, patternObj, TCL_REG_ADVANCED | TCL_REG_NOSUB); if (re == NULL) { return -1; } return Tcl_RegExpExecObj(interp, re, stringObj, 0 /* offset */, 0 /* nmatches */, 0 /* flags */); } /* *---------------------------------------------------------------------- * * Tcl_RegExpGetInfo -- * * Retrieve information about the current match. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ void Tcl_RegExpGetInfo(regexp, infoPtr) Tcl_RegExp regexp; /* Pattern from which to get subexpressions. */ Tcl_RegExpInfo *infoPtr; /* Match information is stored here. */ { TclRegexp *regexpPtr = (TclRegexp *) regexp; infoPtr->nsubs = regexpPtr->re.re_nsub; infoPtr->matches = (Tcl_RegExpIndices *) regexpPtr->matches; infoPtr->extendStart = regexpPtr->details.rm_extend.rm_so; } /* *---------------------------------------------------------------------- * * Tcl_GetRegExpFromObj -- * * Compile a regular expression into a form suitable for fast * matching. This procedure caches the result in a Tcl_Obj. * * Results: * The return value is a pointer to the compiled form of string, * suitable for passing to Tcl_RegExpExec. If an error occurred * while compiling the pattern, then NULL is returned and an error * message is left in the interp's result. * * Side effects: * Updates the native rep of the Tcl_Obj. * *---------------------------------------------------------------------- */ Tcl_RegExp Tcl_GetRegExpFromObj(interp, objPtr, flags) Tcl_Interp *interp; /* For use in error reporting, and to access * the interp regexp cache. */ Tcl_Obj *objPtr; /* Object whose string rep contains regular * expression pattern. Internal rep will be * changed to compiled form of this regular * expression. */ int flags; /* Regular expression compilation flags. */ { int length; Tcl_ObjType *typePtr; TclRegexp *regexpPtr; char *pattern; /* * This is OK because we only actually interpret this value * properly as a TclRegexp* when the type is tclRegexpType. */ regexpPtr = (TclRegexp *) objPtr->internalRep.otherValuePtr; if ((objPtr->typePtr != &tclRegexpType) || (regexpPtr->flags != flags)) { pattern = Tcl_GetStringFromObj(objPtr, &length); regexpPtr = CompileRegexp(interp, pattern, length, flags); if (regexpPtr == NULL) { return NULL; } /* * Add a reference to the regexp so it will persist even if it is * pushed out of the current thread's regexp cache. This reference * will be removed when the object's internal rep is freed. */ regexpPtr->refCount++; /* * Free the old representation and set our type. */ TclFreeIntRep(objPtr); objPtr->internalRep.otherValuePtr = (VOID *) regexpPtr; objPtr->typePtr = &tclRegexpType; } return (Tcl_RegExp) regexpPtr; } /* *---------------------------------------------------------------------- * * TclRegAbout -- * * Return information about a compiled regular expression. * * Results: * The return value is -1 for failure, 0 for success, although at * the moment there's nothing that could fail. On success, a list * is left in the interp's result: first element is the subexpression * count, second is a list of re_info bit names. * * Side effects: * None. * *---------------------------------------------------------------------- */ int TclRegAbout(interp, re) Tcl_Interp *interp; /* For use in variable assignment. */ Tcl_RegExp re; /* The compiled regular expression. */ { TclRegexp *regexpPtr = (TclRegexp *)re; char buf[TCL_INTEGER_SPACE]; static struct infoname { int bit; char *text; } infonames[] = { {REG_UBACKREF, "REG_UBACKREF"}, {REG_ULOOKAHEAD, "REG_ULOOKAHEAD"}, {REG_UBOUNDS, "REG_UBOUNDS"}, {REG_UBRACES, "REG_UBRACES"}, {REG_UBSALNUM, "REG_UBSALNUM"}, {REG_UPBOTCH, "REG_UPBOTCH"}, {REG_UBBS, "REG_UBBS"}, {REG_UNONPOSIX, "REG_UNONPOSIX"}, {REG_UUNSPEC, "REG_UUNSPEC"}, {REG_UUNPORT, "REG_UUNPORT"}, {REG_ULOCALE, "REG_ULOCALE"}, {REG_UEMPTYMATCH, "REG_UEMPTYMATCH"}, {REG_UIMPOSSIBLE, "REG_UIMPOSSIBLE"}, {REG_USHORTEST, "REG_USHORTEST"}, {0, ""} }; struct infoname *inf; int n; Tcl_ResetResult(interp); sprintf(buf, "%u", (unsigned)(regexpPtr->re.re_nsub)); Tcl_AppendElement(interp, buf); /* * Must count bits before generating list, because we must know * whether {} are needed before we start appending names. */ n = 0; for (inf = infonames; inf->bit != 0; inf++) { if (regexpPtr->re.re_info&inf->bit) { n++; } } if (n != 1) { Tcl_AppendResult(interp, " {", NULL); } for (inf = infonames; inf->bit != 0; inf++) { if (regexpPtr->re.re_info&inf->bit) { Tcl_AppendElement(interp, inf->text); } } if (n != 1) { Tcl_AppendResult(interp, "}", NULL); } return 0; } /* *---------------------------------------------------------------------- * * TclRegError -- * * Generate an error message based on the regexp status code. * * Results: * Places an error in the interpreter. * * Side effects: * Sets errorCode as well. * *---------------------------------------------------------------------- */ void TclRegError(interp, msg, status) Tcl_Interp *interp; /* Interpreter for error reporting. */ CONST char *msg; /* Message to prepend to error. */ int status; /* Status code to report. */ { char buf[100]; /* ample in practice */ char cbuf[100]; /* lots in practice */ size_t n; char *p; Tcl_ResetResult(interp); n = TclReError(status, (regex_t *)NULL, buf, sizeof(buf)); p = (n > sizeof(buf)) ? "..." : ""; Tcl_AppendResult(interp, msg, buf, p, NULL); sprintf(cbuf, "%d", status); (VOID) TclReError(REG_ITOA, (regex_t *)NULL, cbuf, sizeof(cbuf)); Tcl_SetErrorCode(interp, "REGEXP", cbuf, buf, NULL); } /* *---------------------------------------------------------------------- * * FreeRegexpInternalRep -- * * Deallocate the storage associated with a regexp object's internal * representation. * * Results: * None. * * Side effects: * Frees the compiled regular expression. * *---------------------------------------------------------------------- */ static void FreeRegexpInternalRep(objPtr) Tcl_Obj *objPtr; /* Regexp object with internal rep to free. */ { TclRegexp *regexpRepPtr = (TclRegexp *) objPtr->internalRep.otherValuePtr; /* * If this is the last reference to the regexp, free it. */ if (--(regexpRepPtr->refCount) <= 0) { FreeRegexp(regexpRepPtr); } } /* *---------------------------------------------------------------------- * * DupRegexpInternalRep -- * * We copy the reference to the compiled regexp and bump its * reference count. * * Results: * None. * * Side effects: * Increments the reference count of the regexp. * *---------------------------------------------------------------------- */ static void DupRegexpInternalRep(srcPtr, copyPtr) Tcl_Obj *srcPtr; /* Object with internal rep to copy. */ Tcl_Obj *copyPtr; /* Object with internal rep to set. */ { TclRegexp *regexpPtr = (TclRegexp *) srcPtr->internalRep.otherValuePtr; regexpPtr->refCount++; copyPtr->internalRep.otherValuePtr = srcPtr->internalRep.otherValuePtr; copyPtr->typePtr = &tclRegexpType; } /* *---------------------------------------------------------------------- * * SetRegexpFromAny -- * * Attempt to generate a compiled regular expression for the Tcl object * "objPtr". * * Results: * The return value is TCL_OK or TCL_ERROR. If an error occurs during * conversion, an error message is left in the interpreter's result * unless "interp" is NULL. * * Side effects: * If no error occurs, a regular expression is stored as "objPtr"s * internal representation. * *---------------------------------------------------------------------- */ static int SetRegexpFromAny(interp, objPtr) Tcl_Interp *interp; /* Used for error reporting if not NULL. */ Tcl_Obj *objPtr; /* The object to convert. */ { if (Tcl_GetRegExpFromObj(interp, objPtr, REG_ADVANCED) == NULL) { return TCL_ERROR; } return TCL_OK; } /* *--------------------------------------------------------------------------- * * CompileRegexp -- * * Attempt to compile the given regexp pattern. If the compiled * regular expression can be found in the per-thread cache, it * will be used instead of compiling a new copy. * * Results: * The return value is a pointer to a newly allocated TclRegexp * that represents the compiled pattern, or NULL if the pattern * could not be compiled. If NULL is returned, an error message is * left in the interp's result. * * Side effects: * The thread-local regexp cache is updated and a new TclRegexp may * be allocated. * *---------------------------------------------------------------------- */ static TclRegexp * CompileRegexp(interp, string, length, flags) Tcl_Interp *interp; /* Used for error reporting if not NULL. */ CONST char *string; /* The regexp to compile (UTF-8). */ int length; /* The length of the string in bytes. */ int flags; /* Compilation flags. */ { TclRegexp *regexpPtr; CONST Tcl_UniChar *uniString; int numChars; Tcl_DString stringBuf; int status, i; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); if (!tsdPtr->initialized) { tsdPtr->initialized = 1; Tcl_CreateThreadExitHandler(FinalizeRegexp, NULL); } /* * This routine maintains a second-level regular expression cache in * addition to the per-object regexp cache. The per-thread cache is needed * to handle the case where for various reasons the object is lost between * invocations of the regexp command, but the literal pattern is the same. */ /* * Check the per-thread compiled regexp cache. We can only reuse * a regexp if it has the same pattern and the same flags. */ for (i = 0; (i < NUM_REGEXPS) && (tsdPtr->patterns[i] != NULL); i++) { if ((length == tsdPtr->patLengths[i]) && (tsdPtr->regexps[i]->flags == flags) && (strcmp(string, tsdPtr->patterns[i]) == 0)) { /* * Move the matched pattern to the first slot in the * cache and shift the other patterns down one position. */ if (i != 0) { int j; char *cachedString; cachedString = tsdPtr->patterns[i]; regexpPtr = tsdPtr->regexps[i]; for (j = i-1; j >= 0; j--) { tsdPtr->patterns[j+1] = tsdPtr->patterns[j]; tsdPtr->patLengths[j+1] = tsdPtr->patLengths[j]; tsdPtr->regexps[j+1] = tsdPtr->regexps[j]; } tsdPtr->patterns[0] = cachedString; tsdPtr->patLengths[0] = length; tsdPtr->regexps[0] = regexpPtr; } return tsdPtr->regexps[0]; } } /* * This is a new expression, so compile it and add it to the cache. */ regexpPtr = (TclRegexp *) ckalloc(sizeof(TclRegexp)); regexpPtr->objPtr = NULL; regexpPtr->string = NULL; regexpPtr->details.rm_extend.rm_so = -1; regexpPtr->details.rm_extend.rm_eo = -1; /* * Get the up-to-date string representation and map to unicode. */ Tcl_DStringInit(&stringBuf); uniString = Tcl_UtfToUniCharDString(string, length, &stringBuf); numChars = Tcl_DStringLength(&stringBuf) / sizeof(Tcl_UniChar); /* * Compile the string and check for errors. */ regexpPtr->flags = flags; status = TclReComp(®expPtr->re, uniString, (size_t) numChars, flags); Tcl_DStringFree(&stringBuf); if (status != REG_OKAY) { /* * Clean up and report errors in the interpreter, if possible. */ ckfree((char *)regexpPtr); if (interp) { TclRegError(interp, "couldn't compile regular expression pattern: ", status); } return NULL; } /* * Allocate enough space for all of the subexpressions, plus one * extra for the entire pattern. */ regexpPtr->matches = (regmatch_t *) ckalloc( sizeof(regmatch_t) * (regexpPtr->re.re_nsub + 1)); /* * Initialize the refcount to one initially, since it is in the cache. */ regexpPtr->refCount = 1; /* * Free the last regexp, if necessary, and make room at the head of the * list for the new regexp. */ if (tsdPtr->patterns[NUM_REGEXPS-1] != NULL) { TclRegexp *oldRegexpPtr = tsdPtr->regexps[NUM_REGEXPS-1]; if (--(oldRegexpPtr->refCount) <= 0) { FreeRegexp(oldRegexpPtr); } ckfree(tsdPtr->patterns[NUM_REGEXPS-1]); } for (i = NUM_REGEXPS - 2; i >= 0; i--) { tsdPtr->patterns[i+1] = tsdPtr->patterns[i]; tsdPtr->patLengths[i+1] = tsdPtr->patLengths[i]; tsdPtr->regexps[i+1] = tsdPtr->regexps[i]; } tsdPtr->patterns[0] = (char *) ckalloc((unsigned) (length+1)); strcpy(tsdPtr->patterns[0], string); tsdPtr->patLengths[0] = length; tsdPtr->regexps[0] = regexpPtr; return regexpPtr; } /* *---------------------------------------------------------------------- * * FreeRegexp -- * * Release the storage associated with a TclRegexp. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ static void FreeRegexp(regexpPtr) TclRegexp *regexpPtr; /* Compiled regular expression to free. */ { TclReFree(®expPtr->re); if (regexpPtr->matches) { ckfree((char *) regexpPtr->matches); } ckfree((char *) regexpPtr); } /* *---------------------------------------------------------------------- * * FinalizeRegexp -- * * Release the storage associated with the per-thread regexp * cache. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ static void FinalizeRegexp(clientData) ClientData clientData; /* Not used. */ { int i; TclRegexp *regexpPtr; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); for (i = 0; (i < NUM_REGEXPS) && (tsdPtr->patterns[i] != NULL); i++) { regexpPtr = tsdPtr->regexps[i]; if (--(regexpPtr->refCount) <= 0) { FreeRegexp(regexpPtr); } ckfree(tsdPtr->patterns[i]); } }