/[pcre]/code/trunk/pcreposix.c
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revision 71 by nigel, Sat Feb 24 21:40:24 2007 UTC revision 432 by ph10, Wed Sep 2 16:02:56 2009 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.  
7    
8  This module is a wrapper that provides a POSIX API to the underlying PCRE                         Written by Philip Hazel
9  functions.             Copyright (c) 1997-2009 University of Cambridge
10    
11  Written by: Philip Hazel <ph10@cam.ac.uk>  -----------------------------------------------------------------------------
12    Redistribution and use in source and binary forms, with or without
13    modification, are permitted provided that the following conditions are met:
14    
15             Copyright (c) 1997-2003 University of Cambridge      * Redistributions of source code must retain the above copyright notice,
16          this list of conditions and the following disclaimer.
17    
18  -----------------------------------------------------------------------------      * Redistributions in binary form must reproduce the above copyright
19  Permission is granted to anyone to use this software for any purpose on any        notice, this list of conditions and the following disclaimer in the
20  computer system, and to redistribute it freely, subject to the following        documentation and/or other materials provided with the distribution.
21  restrictions:  
22        * Neither the name of the University of Cambridge nor the names of its
23  1. This software is distributed in the hope that it will be useful,        contributors may be used to endorse or promote products derived from
24     but WITHOUT ANY WARRANTY; without even the implied warranty of        this software without specific prior written permission.
25     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
26    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27  2. The origin of this software must not be misrepresented, either by  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28     explicit claim or by omission.  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30  3. Altered versions must be plainly marked as such, and must not be  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31     misrepresented as being the original software.  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33  4. If PCRE is embedded in any software that is released under the GNU  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34     General Purpose Licence (GPL), then the terms of that licence shall  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35     supersede any condition above with which it is incompatible.  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36    POSSIBILITY OF SUCH DAMAGE.
37  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
38  */  */
39    
40  #include "internal.h"  
41  #include "pcreposix.h"  /* This module is a wrapper that provides a POSIX API to the underlying PCRE
42  #include "stdlib.h"  functions. */
43    
44    
45    #ifdef HAVE_CONFIG_H
46    #include "config.h"
47    #endif
48    
 /* Corresponding tables of PCRE error messages and POSIX error codes. */  
49    
50  static const char *estring[] = {  /* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
51    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,  compiling these functions. This must come before including pcreposix.h, where
52    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,  they are set for an application (using these functions) if they have not
53    ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,  previously been set. */
54    ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39, ERR40,  
55    ERR41, ERR42, ERR43, ERR44 };  #if defined(_WIN32) && !defined(PCRE_STATIC)
56    #  define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
57  static int eint[] = {  #  define PCREPOSIX_EXP_DEFN __declspec(dllexport)
58    REG_EESCAPE, /* "\\ at end of pattern" */  #endif
59    REG_EESCAPE, /* "\\c at end of pattern" */  
60    REG_EESCAPE, /* "unrecognized character follows \\" */  #include "pcre.h"
61    REG_BADBR,   /* "numbers out of order in {} quantifier" */  #include "pcre_internal.h"
62    REG_BADBR,   /* "number too big in {} quantifier" */  #include "pcreposix.h"
63    REG_EBRACK,  /* "missing terminating ] for character class" */  
64    REG_ECTYPE,  /* "invalid escape sequence in character class" */  
65    REG_ERANGE,  /* "range out of order in character class" */  /* Table to translate PCRE compile time error codes into POSIX error codes. */
66    REG_BADRPT,  /* "nothing to repeat" */  
67    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */  static const int eint[] = {
68    REG_ASSERT,  /* "internal error: unexpected repeat" */    0,           /* no error */
69    REG_BADPAT,  /* "unrecognized character after (?" */    REG_EESCAPE, /* \ at end of pattern */
70    REG_BADPAT,  /* "POSIX named classes are supported only within a class" */    REG_EESCAPE, /* \c at end of pattern */
71    REG_EPAREN,  /* "missing )" */    REG_EESCAPE, /* unrecognized character follows \ */
72    REG_ESUBREG, /* "reference to non-existent subpattern" */    REG_BADBR,   /* numbers out of order in {} quantifier */
73    REG_INVARG,  /* "erroffset passed as NULL" */    /* 5 */
74    REG_INVARG,  /* "unknown option bit(s) set" */    REG_BADBR,   /* number too big in {} quantifier */
75    REG_EPAREN,  /* "missing ) after comment" */    REG_EBRACK,  /* missing terminating ] for character class */
76    REG_ESIZE,   /* "parentheses nested too deeply" */    REG_ECTYPE,  /* invalid escape sequence in character class */
77    REG_ESIZE,   /* "regular expression too large" */    REG_ERANGE,  /* range out of order in character class */
78    REG_ESPACE,  /* "failed to get memory" */    REG_BADRPT,  /* nothing to repeat */
79    REG_EPAREN,  /* "unmatched brackets" */    /* 10 */
80    REG_ASSERT,  /* "internal error: code overflow" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
81    REG_BADPAT,  /* "unrecognized character after (?<" */    REG_ASSERT,  /* internal error: unexpected repeat */
82    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_BADPAT,  /* unrecognized character after (? */
83    REG_BADPAT,  /* "malformed number after (?(" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
84    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_EPAREN,  /* missing ) */
85    REG_BADPAT,  /* "assertion expected after (?(" */    /* 15 */
86    REG_BADPAT,  /* "(?R or (?digits must be followed by )" */    REG_ESUBREG, /* reference to non-existent subpattern */
87    REG_ECTYPE,  /* "unknown POSIX class name" */    REG_INVARG,  /* erroffset passed as NULL */
88    REG_BADPAT,  /* "POSIX collating elements are not supported" */    REG_INVARG,  /* unknown option bit(s) set */
89    REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */    REG_EPAREN,  /* missing ) after comment */
90    REG_BADPAT,  /* "spare error" */    REG_ESIZE,   /* parentheses nested too deeply */
91    REG_BADPAT,  /* "character value in \x{...} sequence is too large" */    /* 20 */
92    REG_BADPAT,  /* "invalid condition (?(0)" */    REG_ESIZE,   /* regular expression too large */
93    REG_BADPAT,  /* "\\C not allowed in lookbehind assertion" */    REG_ESPACE,  /* failed to get memory */
94    REG_EESCAPE, /* "PCRE does not support \\L, \\l, \\N, \\P, \\p, \\U, \\u, or \\X" */    REG_EPAREN,  /* unmatched parentheses */
95    REG_BADPAT,  /* "number after (?C is > 255" */    REG_ASSERT,  /* internal error: code overflow */
96    REG_BADPAT,  /* "closing ) for (?C expected" */    REG_BADPAT,  /* unrecognized character after (?< */
97    REG_BADPAT,  /* "recursive call could loop indefinitely" */    /* 25 */
98    REG_BADPAT,  /* "unrecognized character after (?P" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
99    REG_BADPAT,  /* "syntax error after (?P" */    REG_BADPAT,  /* malformed number or name after (?( */
100    REG_BADPAT,  /* "two named groups have the same name" */    REG_BADPAT,  /* conditional group contains more than two branches */
101    REG_BADPAT   /* "invalid UTF-8 string" */    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,  /* (*VERB) with an argument is not supported */
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  };  };
146    
147  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
148    
149  static const char *pstring[] = {  static const char *const pstring[] = {
150    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
151    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
152    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 124  static const char *pstring[] = { Line 171  static const char *pstring[] = {
171    
172    
173  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
174  *          Translate error code to string        *  *          Translate error code to string        *
175  *************************************************/  *************************************************/
176    
177  size_t  PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
178  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)
179  {  {
180  const char *message, *addmessage;  const char *message, *addmessage;
# Line 180  return length + addlength; Line 209  return length + addlength;
209  *           Free store held by a regex           *  *           Free store held by a regex           *
210  *************************************************/  *************************************************/
211    
212  void  PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
213  regfree(regex_t *preg)  regfree(regex_t *preg)
214  {  {
215  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 203  Returns:      0 on success Line 232  Returns:      0 on success
232                various non-zero codes on failure                various non-zero codes on failure
233  */  */
234    
235  int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
236  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
237  {  {
238  const char *errorptr;  const char *errorptr;
239  int erroffset;  int erroffset;
240    int errorcode;
241  int options = 0;  int options = 0;
242    
243  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
244  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
245    if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
246    if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
247    if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
248    if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
249    
250  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
251      &erroffset, NULL);
252  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
253    
254  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  /* Safety: if the error code is too big for the translation vector (which
255    should not happen, but we all make mistakes), return REG_BADPAT. */
256    
257    if (preg->re_pcre == NULL)
258      {
259      return (errorcode < sizeof(eint)/sizeof(const int))?
260        eint[errorcode] : REG_BADPAT;
261      }
262    
263  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
264  return 0;  return 0;
# Line 234  substring, so we have to get and release Line 276  substring, so we have to get and release
276  the POSIX structures as was done in earlier releases when PCRE needed only 2  the POSIX structures as was done in earlier releases when PCRE needed only 2
277  ints. However, if the number of possible capturing brackets is small, use a  ints. However, if the number of possible capturing brackets is small, use a
278  block of store on the stack, to reduce the use of malloc/free. The threshold is  block of store on the stack, to reduce the use of malloc/free. The threshold is
279  in a macro that can be changed at configure time. */  in a macro that can be changed at configure time.
280    
281    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
282    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
283    the only result is yes/no/error. */
284    
285  int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
286  regexec(const regex_t *preg, const char *string, size_t nmatch,  regexec(const regex_t *preg, const char *string, size_t nmatch,
287    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
288  {  {
289  int rc;  int rc, so, eo;
290  int options = 0;  int options = 0;
291  int *ovector = NULL;  int *ovector = NULL;
292  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
293  BOOL allocated_ovector = FALSE;  BOOL allocated_ovector = FALSE;
294    BOOL nosub =
295      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
296    
297  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
298  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
299    if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
300    
301  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
302    
303  if (nmatch > 0)  /* When no string data is being returned, or no vector has been passed in which
304    to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
305    the return data is large enough. */
306    
307    if (nosub || pmatch == NULL) nmatch = 0;
308    
309    else if (nmatch > 0)
310    {    {
311    if (nmatch <= POSIX_MALLOC_THRESHOLD)    if (nmatch <= POSIX_MALLOC_THRESHOLD)
312      {      {
# Line 259  if (nmatch > 0) Line 314  if (nmatch > 0)
314      }      }
315    else    else
316      {      {
317        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
318      ovector = (int *)malloc(sizeof(int) * nmatch * 3);      ovector = (int *)malloc(sizeof(int) * nmatch * 3);
319      if (ovector == NULL) return REG_ESPACE;      if (ovector == NULL) return REG_ESPACE;
320      allocated_ovector = TRUE;      allocated_ovector = TRUE;
321      }      }
322    }    }
323    
324  rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),  /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
325    The man page from OS X says "REG_STARTEND affects only the location of the
326    string, not how it is matched". That is why the "so" value is used to bump the
327    start location rather than being passed as a PCRE "starting offset". */
328    
329    if ((eflags & REG_STARTEND) != 0)
330      {
331      so = pmatch[0].rm_so;
332      eo = pmatch[0].rm_eo;
333      }
334    else
335      {
336      so = 0;
337      eo = strlen(string);
338      }
339    
340    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
341    0, options, ovector, nmatch * 3);    0, options, ovector, nmatch * 3);
342    
343  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
# Line 273  if (rc == 0) rc = nmatch;    /* All capt Line 345  if (rc == 0) rc = nmatch;    /* All capt
345  if (rc >= 0)  if (rc >= 0)
346    {    {
347    size_t i;    size_t i;
348    for (i = 0; i < (size_t)rc; i++)    if (!nosub)
349      {      {
350      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
351      pmatch[i].rm_eo = ovector[i*2+1];        {
352          pmatch[i].rm_so = ovector[i*2];
353          pmatch[i].rm_eo = ovector[i*2+1];
354          }
355        if (allocated_ovector) free(ovector);
356        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
357      }      }
   if (allocated_ovector) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
358    return 0;    return 0;
359    }    }
360    
# Line 294  else Line 369  else
369      case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
370      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
371      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
372        case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
373        case PCRE_ERROR_BADUTF8: return REG_INVARG;
374        case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
375      default: return REG_ASSERT;      default: return REG_ASSERT;
376      }      }
377    }    }

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