/[pcre]/code/trunk/pcreposix.c
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revision 7 by nigel, Sat Feb 24 21:38:09 2007 UTC revision 518 by ph10, Tue May 18 15:47:01 2010 UTC
# Line 2  Line 2 
2  *      Perl-Compatible Regular Expressions       *  *      Perl-Compatible Regular Expressions       *
3  *************************************************/  *************************************************/
4    
5  /*  /* PCRE is a library of functions to support regular expressions whose syntax
6  This is a library of functions to support regular expressions whose syntax  and semantics are as close as possible to those of the Perl 5 language.
 and semantics are as close as possible to those of the Perl 5 language. See  
 the file Tech.Notes for some information on the internals.  
   
 This module is a wrapper that provides a POSIX API to the underlying PCRE  
 functions.  
   
 Written by: Philip Hazel <ph10@cam.ac.uk>  
7    
8             Copyright (c) 1997 University of Cambridge                         Written by Philip Hazel
9               Copyright (c) 1997-2010 University of Cambridge
10    
11  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
12  Permission is granted to anyone to use this software for any purpose on any  Redistribution and use in source and binary forms, with or without
13  computer system, and to redistribute it freely, subject to the following  modification, are permitted provided that the following conditions are met:
 restrictions:  
   
 1. This software is distributed in the hope that it will be useful,  
    but WITHOUT ANY WARRANTY; without even the implied warranty of  
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
14    
15  2. The origin of this software must not be misrepresented, either by      * Redistributions of source code must retain the above copyright notice,
16     explicit claim or by omission.        this list of conditions and the following disclaimer.
17    
18  3. Altered versions must be plainly marked as such, and must not be      * Redistributions in binary form must reproduce the above copyright
19     misrepresented as being the original software.        notice, this list of conditions and the following disclaimer in the
20          documentation and/or other materials provided with the distribution.
21    
22        * Neither the name of the University of Cambridge nor the names of its
23          contributors may be used to endorse or promote products derived from
24          this software without specific prior written permission.
25    
26    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36    POSSIBILITY OF SUCH DAMAGE.
37  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
38  */  */
39    
 #include "internal.h"  
 #include "pcreposix.h"  
 #include "stdlib.h"  
40    
41    /* This module is a wrapper that provides a POSIX API to the underlying PCRE
42    functions. */
43    
44    
45    #ifdef HAVE_CONFIG_H
46    #include "config.h"
47    #endif
48    
49    
50  /* Corresponding tables of PCRE error messages and POSIX error codes. */  /* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
51    compiling these functions. This must come before including pcreposix.h, where
52    they are set for an application (using these functions) if they have not
53    previously been set. */
54    
55  static const char *estring[] = {  #if defined(_WIN32) && !defined(PCRE_STATIC)
56    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,  #  define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
57    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,  #  define PCREPOSIX_EXP_DEFN __declspec(dllexport)
58    ERR21, ERR22, ERR23 };  #endif
59    
60  static int eint[] = {  #include "pcre.h"
61    REG_EESCAPE, /* "\\ at end of pattern" */  #include "pcre_internal.h"
62    REG_EESCAPE, /* "\\c at end of pattern" */  #include "pcreposix.h"
63    REG_EESCAPE, /* "unrecognized character follows \\" */  
64    REG_BADBR,   /* "numbers out of order in {} quantifier" */  
65    REG_BADBR,   /* "number too big in {} quantifier" */  /* Table to translate PCRE compile time error codes into POSIX error codes. */
66    REG_EBRACK,  /* "missing terminating ] for character class" */  
67    REG_ECTYPE,  /* "invalid escape sequence in character class" */  static const int eint[] = {
68    REG_ERANGE,  /* "range out of order in character class" */    0,           /* no error */
69    REG_BADRPT,  /* "nothing to repeat" */    REG_EESCAPE, /* \ at end of pattern */
70    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_EESCAPE, /* \c at end of pattern */
71    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_EESCAPE, /* unrecognized character follows \ */
72    REG_BADPAT,  /* "unrecognized character after (?" */    REG_BADBR,   /* numbers out of order in {} quantifier */
73    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    /* 5 */
74    REG_EPAREN,  /* "missing )" */    REG_BADBR,   /* number too big in {} quantifier */
75    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_EBRACK,  /* missing terminating ] for character class */
76    REG_INVARG,  /* "erroffset passed as NULL" */    REG_ECTYPE,  /* invalid escape sequence in character class */
77    REG_INVARG,  /* "unknown option bit(s) set" */    REG_ERANGE,  /* range out of order in character class */
78    REG_EPAREN,  /* "missing ) after comment" */    REG_BADRPT,  /* nothing to repeat */
79    REG_ESIZE,   /* "too many sets of parentheses" */    /* 10 */
80    REG_ESIZE,   /* "regular expression too large" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
81    REG_ESPACE,  /* "failed to get memory" */    REG_ASSERT,  /* internal error: unexpected repeat */
82    REG_EPAREN,  /* "unmatched brackets" */    REG_BADPAT,  /* unrecognized character after (? */
83    REG_ASSERT   /* "internal error: code overflow" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
84      REG_EPAREN,  /* missing ) */
85      /* 15 */
86      REG_ESUBREG, /* reference to non-existent subpattern */
87      REG_INVARG,  /* erroffset passed as NULL */
88      REG_INVARG,  /* unknown option bit(s) set */
89      REG_EPAREN,  /* missing ) after comment */
90      REG_ESIZE,   /* parentheses nested too deeply */
91      /* 20 */
92      REG_ESIZE,   /* regular expression too large */
93      REG_ESPACE,  /* failed to get memory */
94      REG_EPAREN,  /* unmatched parentheses */
95      REG_ASSERT,  /* internal error: code overflow */
96      REG_BADPAT,  /* unrecognized character after (?< */
97      /* 25 */
98      REG_BADPAT,  /* lookbehind assertion is not fixed length */
99      REG_BADPAT,  /* malformed number or name after (?( */
100      REG_BADPAT,  /* conditional group contains more than two branches */
101      REG_BADPAT,  /* assertion expected after (?( */
102      REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
103      /* 30 */
104      REG_ECTYPE,  /* unknown POSIX class name */
105      REG_BADPAT,  /* POSIX collating elements are not supported */
106      REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
107      REG_BADPAT,  /* spare error */
108      REG_BADPAT,  /* character value in \x{...} sequence is too large */
109      /* 35 */
110      REG_BADPAT,  /* invalid condition (?(0) */
111      REG_BADPAT,  /* \C not allowed in lookbehind assertion */
112      REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
113      REG_BADPAT,  /* number after (?C is > 255 */
114      REG_BADPAT,  /* closing ) for (?C expected */
115      /* 40 */
116      REG_BADPAT,  /* recursive call could loop indefinitely */
117      REG_BADPAT,  /* unrecognized character after (?P */
118      REG_BADPAT,  /* syntax error in subpattern name (missing terminator) */
119      REG_BADPAT,  /* two named subpatterns have the same name */
120      REG_BADPAT,  /* invalid UTF-8 string */
121      /* 45 */
122      REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */
123      REG_BADPAT,  /* malformed \P or \p sequence */
124      REG_BADPAT,  /* unknown property name after \P or \p */
125      REG_BADPAT,  /* subpattern name is too long (maximum 32 characters) */
126      REG_BADPAT,  /* too many named subpatterns (maximum 10,000) */
127      /* 50 */
128      REG_BADPAT,  /* repeated subpattern is too long */
129      REG_BADPAT,  /* octal value is greater than \377 (not in UTF-8 mode) */
130      REG_BADPAT,  /* internal error: overran compiling workspace */
131      REG_BADPAT,  /* internal error: previously-checked referenced subpattern not found */
132      REG_BADPAT,  /* DEFINE group contains more than one branch */
133      /* 55 */
134      REG_BADPAT,  /* repeating a DEFINE group is not allowed */
135      REG_INVARG,  /* inconsistent NEWLINE options */
136      REG_BADPAT,  /* \g is not followed followed by an (optionally braced) non-zero number */
137      REG_BADPAT,  /* a numbered reference must not be zero */
138      REG_BADPAT,  /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
139      /* 60 */
140      REG_BADPAT,  /* (*VERB) not recognized */
141      REG_BADPAT,  /* number is too big */
142      REG_BADPAT,  /* subpattern name expected */
143      REG_BADPAT,  /* digit expected after (?+ */
144      REG_BADPAT,  /* ] is an invalid data character in JavaScript compatibility mode */
145      /* 65 */
146      REG_BADPAT,  /* different names for subpatterns of the same number are not allowed */
147      REG_BADPAT,  /* (*MARK) must have an argument */
148      REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UCP support */
149  };  };
150    
151  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
152    
153  static const char *pstring[] = {  static const char *const pstring[] = {
154    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
155    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
156    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 97  static const char *pstring[] = { Line 175  static const char *pstring[] = {
175    
176    
177  /*************************************************  /*************************************************
 *          Translate PCRE text code to int       *  
 *************************************************/  
   
 /* PCRE compile-time errors are given as strings defined as macros. We can just  
 look them up in a table to turn them into POSIX-style error codes. */  
   
 static int  
 pcre_posix_error_code(const char *s)  
 {  
 size_t i;  
 for (i = 0; i < sizeof(estring)/sizeof(char *); i++)  
   if (strcmp(s, estring[i]) == 0) return eint[i];  
 return REG_ASSERT;  
 }  
   
   
   
 /*************************************************  
178  *          Translate error code to string        *  *          Translate error code to string        *
179  *************************************************/  *************************************************/
180    
181  size_t  PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
182  regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)  regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
183  {  {
184  const char *message, *addmessage;  const char *message, *addmessage;
# Line 135  addlength = (preg != NULL && (int)preg-> Line 195  addlength = (preg != NULL && (int)preg->
195  if (errbuf_size > 0)  if (errbuf_size > 0)
196    {    {
197    if (addlength > 0 && errbuf_size >= length + addlength)    if (addlength > 0 && errbuf_size >= length + addlength)
198      sprintf(errbuf, "%s%s%-6d", message, addmessage, preg->re_erroffset);      sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
199    else    else
200      {      {
201      strncpy(errbuf, message, errbuf_size - 1);      strncpy(errbuf, message, errbuf_size - 1);
# Line 153  return length + addlength; Line 213  return length + addlength;
213  *           Free store held by a regex           *  *           Free store held by a regex           *
214  *************************************************/  *************************************************/
215    
216  void  PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
217  regfree(regex_t *preg)  regfree(regex_t *preg)
218  {  {
219  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 176  Returns:      0 on success Line 236  Returns:      0 on success
236                various non-zero codes on failure                various non-zero codes on failure
237  */  */
238    
239  int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
240  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
241  {  {
242  const char *errorptr;  const char *errorptr;
243  int erroffset;  int erroffset;
244    int errorcode;
245  int options = 0;  int options = 0;
246    
247  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
248  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
249    if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
250    if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
251    if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
252    if ((cflags & REG_UCP) != 0)      options |= PCRE_UCP;
253    if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
254    
255  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
256      &erroffset, NULL);
257  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
258    
259  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  /* Safety: if the error code is too big for the translation vector (which
260    should not happen, but we all make mistakes), return REG_BADPAT. */
261    
262    if (preg->re_pcre == NULL)
263      {
264      return (errorcode < sizeof(eint)/sizeof(const int))?
265        eint[errorcode] : REG_BADPAT;
266      }
267    
268  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
269  return 0;  return 0;
270  }  }
271    
# Line 202  return 0; Line 276  return 0;
276  *              Match a regular expression        *  *              Match a regular expression        *
277  *************************************************/  *************************************************/
278    
279  int  /* Unfortunately, PCRE requires 3 ints of working space for each captured
280  regexec(regex_t *preg, const char *string, size_t nmatch,  substring, so we have to get and release working store instead of just using
281    the POSIX structures as was done in earlier releases when PCRE needed only 2
282    ints. However, if the number of possible capturing brackets is small, use a
283    block of store on the stack, to reduce the use of malloc/free. The threshold is
284    in a macro that can be changed at configure time.
285    
286    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
287    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
288    the only result is yes/no/error. */
289    
290    PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
291    regexec(const regex_t *preg, const char *string, size_t nmatch,
292    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
293  {  {
294  int rc;  int rc, so, eo;
295  int options = 0;  int options = 0;
296    int *ovector = NULL;
297    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
298    BOOL allocated_ovector = FALSE;
299    BOOL nosub =
300      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
301    
302  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
303  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
304    if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
305    
306    ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
307    
308    /* When no string data is being returned, or no vector has been passed in which
309    to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
310    the return data is large enough. */
311    
312    if (nosub || pmatch == NULL) nmatch = 0;
313    
314    else if (nmatch > 0)
315      {
316      if (nmatch <= POSIX_MALLOC_THRESHOLD)
317        {
318        ovector = &(small_ovector[0]);
319        }
320      else
321        {
322        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
323        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
324        if (ovector == NULL) return REG_ESPACE;
325        allocated_ovector = TRUE;
326        }
327      }
328    
329    /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
330    The man page from OS X says "REG_STARTEND affects only the location of the
331    string, not how it is matched". That is why the "so" value is used to bump the
332    start location rather than being passed as a PCRE "starting offset". */
333    
334  preg->re_erroffset = -1;   /* Only has meaning after compile */  if ((eflags & REG_STARTEND) != 0)
335      {
336      so = pmatch[0].rm_so;
337      eo = pmatch[0].rm_eo;
338      }
339    else
340      {
341      so = 0;
342      eo = strlen(string);
343      }
344    
345  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), options,  rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
346    (int *)pmatch, nmatch * 2);    0, options, ovector, nmatch * 3);
347    
348  if (rc == 0) return 0;    /* All pmatch were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
349    
350  if (rc > 0)  /* Successful match */
351    
352    if (rc >= 0)
353    {    {
354    size_t i;    size_t i;
355    for (i = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;    if (!nosub)
356        {
357        for (i = 0; i < (size_t)rc; i++)
358          {
359          pmatch[i].rm_so = ovector[i*2];
360          pmatch[i].rm_eo = ovector[i*2+1];
361          }
362        if (allocated_ovector) free(ovector);
363        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
364        }
365    return 0;    return 0;
366    }    }
367    
368  else switch(rc)  /* Unsuccessful match */
369    
370    if (allocated_ovector) free(ovector);
371    switch(rc)
372    {    {
373    /* ========================================================================== */
374      /* These cases are never obeyed. This is a fudge that causes a compile-time
375      error if the vector eint, which is indexed by compile-time error number, is
376      not the correct length. It seems to be the only way to do such a check at
377      compile time, as the sizeof() operator does not work in the C preprocessor.
378      As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
379    
380      case 0:
381      case (sizeof(eint)/sizeof(int) == ERRCOUNT):
382      return REG_ASSERT;
383    /* ========================================================================== */
384    
385    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
   case PCRE_ERROR_BADREF: return REG_ESUBREG;  
386    case PCRE_ERROR_NULL: return REG_INVARG;    case PCRE_ERROR_NULL: return REG_INVARG;
387    case PCRE_ERROR_BADOPTION: return REG_INVARG;    case PCRE_ERROR_BADOPTION: return REG_INVARG;
388    case PCRE_ERROR_BADMAGIC: return REG_INVARG;    case PCRE_ERROR_BADMAGIC: return REG_INVARG;
389    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
390    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
391      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
392      case PCRE_ERROR_BADUTF8: return REG_INVARG;
393      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
394    default: return REG_ASSERT;    default: return REG_ASSERT;
395    }    }
396  }  }

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