/[pcre]/code/trunk/pcreposix.c
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revision 43 by nigel, Sat Feb 24 21:39:21 2007 UTC revision 336 by ph10, Sat Apr 12 15:59:03 2008 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) 1997-2008 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) 1997-2000 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    
 #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    /* 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    #if defined(_WIN32) && !defined(PCRE_STATIC)
56    #  define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
57    #  define PCREPOSIX_EXP_DEFN __declspec(dllexport)
58    #endif
59    
60    #include "pcre.h"
61    #include "pcre_internal.h"
62    #include "pcreposix.h"
63    
 /* Corresponding tables of PCRE error messages and POSIX error codes. */  
64    
65  static const char *estring[] = {  /* Table to translate PCRE compile time error codes into POSIX error codes. */
66    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,  
67    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,  static const int eint[] = {
68    ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,    0,           /* no error */
69    ERR31 };    REG_EESCAPE, /* \ at end of pattern */
70      REG_EESCAPE, /* \c at end of pattern */
71  static int eint[] = {    REG_EESCAPE, /* unrecognized character follows \ */
72    REG_EESCAPE, /* "\\ at end of pattern" */    REG_BADBR,   /* numbers out of order in {} quantifier */
73    REG_EESCAPE, /* "\\c at end of pattern" */    REG_BADBR,   /* number too big in {} quantifier */
74    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_EBRACK,  /* missing terminating ] for character class */
75    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_ECTYPE,  /* invalid escape sequence in character class */
76    REG_BADBR,   /* "number too big in {} quantifier" */    REG_ERANGE,  /* range out of order in character class */
77    REG_EBRACK,  /* "missing terminating ] for character class" */    REG_BADRPT,  /* nothing to repeat */
78    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
79    REG_ERANGE,  /* "range out of order in character class" */    REG_ASSERT,  /* internal error: unexpected repeat */
80    REG_BADRPT,  /* "nothing to repeat" */    REG_BADPAT,  /* unrecognized character after (? */
81    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
82    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_EPAREN,  /* missing ) */
83    REG_BADPAT,  /* "unrecognized character after (?" */    REG_ESUBREG, /* reference to non-existent subpattern */
84    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    REG_INVARG,  /* erroffset passed as NULL */
85    REG_EPAREN,  /* "missing )" */    REG_INVARG,  /* unknown option bit(s) set */
86    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_EPAREN,  /* missing ) after comment */
87    REG_INVARG,  /* "erroffset passed as NULL" */    REG_ESIZE,   /* parentheses nested too deeply */
88    REG_INVARG,  /* "unknown option bit(s) set" */    REG_ESIZE,   /* regular expression too large */
89    REG_EPAREN,  /* "missing ) after comment" */    REG_ESPACE,  /* failed to get memory */
90    REG_ESIZE,   /* "too many sets of parentheses" */    REG_EPAREN,  /* unmatched brackets */
91    REG_ESIZE,   /* "regular expression too large" */    REG_ASSERT,  /* internal error: code overflow */
92    REG_ESPACE,  /* "failed to get memory" */    REG_BADPAT,  /* unrecognized character after (?< */
93    REG_EPAREN,  /* "unmatched brackets" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
94    REG_ASSERT,  /* "internal error: code overflow" */    REG_BADPAT,  /* malformed number or name after (?( */
95    REG_BADPAT,  /* "unrecognized character after (?<" */    REG_BADPAT,  /* conditional group contains more than two branches */
96    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_BADPAT,  /* assertion expected after (?( */
97    REG_BADPAT,  /* "malformed number after (?(" */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
98    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_ECTYPE,  /* unknown POSIX class name */
99    REG_BADPAT,  /* "assertion expected after (?(" */    REG_BADPAT,  /* POSIX collating elements are not supported */
100    REG_BADPAT,  /* "(?p must be followed by )" */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
101    REG_ECTYPE,  /* "unknown POSIX class name" */    REG_BADPAT,  /* spare error */
102    REG_BADPAT   /* "POSIX collating elements are not supported" */    REG_BADPAT,  /* character value in \x{...} sequence is too large */
103      REG_BADPAT,  /* invalid condition (?(0) */
104      REG_BADPAT,  /* \C not allowed in lookbehind assertion */
105      REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
106      REG_BADPAT,  /* number after (?C is > 255 */
107      REG_BADPAT,  /* closing ) for (?C expected */
108      REG_BADPAT,  /* recursive call could loop indefinitely */
109      REG_BADPAT,  /* unrecognized character after (?P */
110      REG_BADPAT,  /* syntax error in subpattern name (missing terminator) */
111      REG_BADPAT,  /* two named subpatterns have the same name */
112      REG_BADPAT,  /* invalid UTF-8 string */
113      REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */
114      REG_BADPAT,  /* malformed \P or \p sequence */
115      REG_BADPAT,  /* unknown property name after \P or \p */
116      REG_BADPAT,  /* subpattern name is too long (maximum 32 characters) */
117      REG_BADPAT,  /* too many named subpatterns (maximum 10,000) */
118      REG_BADPAT,  /* repeated subpattern is too long */
119      REG_BADPAT,  /* octal value is greater than \377 (not in UTF-8 mode) */
120      REG_BADPAT,  /* internal error: overran compiling workspace */
121      REG_BADPAT,  /* internal error: previously-checked referenced subpattern not found */
122      REG_BADPAT,  /* DEFINE group contains more than one branch */
123      REG_BADPAT,  /* repeating a DEFINE group is not allowed */
124      REG_INVARG,  /* inconsistent NEWLINE options */
125      REG_BADPAT,  /* \g is not followed followed by an (optionally braced) non-zero number */
126      REG_BADPAT,  /* (?+ or (?- must be followed by a non-zero number */
127      REG_BADPAT,  /* number is too big */
128      REG_BADPAT,  /* subpattern name expected */
129      REG_BADPAT,  /* digit expected after (?+ */
130      REG_BADPAT   /* ] is an invalid data character in JavaScript compatibility mode */
131  };  };
132    
133  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
134    
135  static const char *pstring[] = {  static const char *const pstring[] = {
136    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
137    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
138    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 110  static const char *pstring[] = { Line 157  static const char *pstring[] = {
157    
158    
159  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
160  *          Translate error code to string        *  *          Translate error code to string        *
161  *************************************************/  *************************************************/
162    
163  size_t  PCREPOSIX_EXP_DEFN size_t
164  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)
165  {  {
166  const char *message, *addmessage;  const char *message, *addmessage;
# Line 166  return length + addlength; Line 195  return length + addlength;
195  *           Free store held by a regex           *  *           Free store held by a regex           *
196  *************************************************/  *************************************************/
197    
198  void  PCREPOSIX_EXP_DEFN void
199  regfree(regex_t *preg)  regfree(regex_t *preg)
200  {  {
201  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 189  Returns: 0 on success Line 218  Returns: 0 on success
218                various non-zero codes on failure                various non-zero codes on failure
219  */  */
220    
221  int  PCREPOSIX_EXP_DEFN int
222  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
223  {  {
224  const char *errorptr;  const char *errorptr;
225  int erroffset;  int erroffset;
226    int errorcode;
227  int options = 0;  int options = 0;
228    
229  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)   options |= PCRE_CASELESS;
230  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
231    if ((cflags & REG_DOTALL) != 0)  options |= PCRE_DOTALL;
232    if ((cflags & REG_NOSUB) != 0)   options |= PCRE_NO_AUTO_CAPTURE;
233    if ((cflags & REG_UTF8) != 0)    options |= PCRE_UTF8;
234    
235  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
236      &erroffset, NULL);
237  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
238    
239  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  if (preg->re_pcre == NULL) return eint[errorcode];
240    
241  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
242  return 0;  return 0;
243  }  }
244    
# Line 218  return 0; Line 252  return 0;
252  /* Unfortunately, PCRE requires 3 ints of working space for each captured  /* Unfortunately, PCRE requires 3 ints of working space for each captured
253  substring, so we have to get and release working store instead of just using  substring, so we have to get and release working store instead of just using
254  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
255  ints. */  ints. However, if the number of possible capturing brackets is small, use a
256    block of store on the stack, to reduce the use of malloc/free. The threshold is
257    in a macro that can be changed at configure time.
258    
259    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
260    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
261    the only result is yes/no/error. */
262    
263  int  PCREPOSIX_EXP_DEFN int
264  regexec(regex_t *preg, const char *string, size_t nmatch,  regexec(const regex_t *preg, const char *string, size_t nmatch,
265    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
266  {  {
267  int rc;  int rc, so, eo;
268  int options = 0;  int options = 0;
269  int *ovector = NULL;  int *ovector = NULL;
270    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
271    BOOL allocated_ovector = FALSE;
272    BOOL nosub =
273      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
274    
275  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
276  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
277    
278  preg->re_erroffset = (size_t)(-1);   /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
279    
280    /* When no string data is being returned, ensure that nmatch is zero.
281    Otherwise, ensure the vector for holding the return data is large enough. */
282    
283    if (nosub) nmatch = 0;
284    
285    else if (nmatch > 0)
286      {
287      if (nmatch <= POSIX_MALLOC_THRESHOLD)
288        {
289        ovector = &(small_ovector[0]);
290        }
291      else
292        {
293        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
294        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
295        if (ovector == NULL) return REG_ESPACE;
296        allocated_ovector = TRUE;
297        }
298      }
299    
300    /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
301    The man page from OS X says "REG_STARTEND affects only the location of the
302    string, not how it is matched". That is why the "so" value is used to bump the
303    start location rather than being passed as a PCRE "starting offset". */
304    
305  if (nmatch > 0)  if ((eflags & REG_STARTEND) != 0)
306      {
307      so = pmatch[0].rm_so;
308      eo = pmatch[0].rm_eo;
309      }
310    else
311    {    {
312    ovector = (int *)malloc(sizeof(int) * nmatch * 3);    so = 0;
313    if (ovector == NULL) return REG_ESPACE;    eo = strlen(string);
314    }    }
315    
316  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), 0, options,  rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
317    ovector, nmatch * 3);    0, options, ovector, nmatch * 3);
318    
319  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
320    
321  if (rc >= 0)  if (rc >= 0)
322    {    {
323    size_t i;    size_t i;
324    for (i = 0; i < rc; i++)    if (!nosub)
325      {      {
326      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
327      pmatch[i].rm_eo = ovector[i*2+1];        {
328          pmatch[i].rm_so = ovector[i*2];
329          pmatch[i].rm_eo = ovector[i*2+1];
330          }
331        if (allocated_ovector) free(ovector);
332        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
333      }      }
   if (ovector != NULL) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
334    return 0;    return 0;
335    }    }
336    
337  else  else
338    {    {
339    if (ovector != NULL) free(ovector);    if (allocated_ovector) free(ovector);
340    switch(rc)    switch(rc)
341      {      {
342      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
# Line 268  else Line 345  else
345      case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
346      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
347      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
348        case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
349        case PCRE_ERROR_BADUTF8: return REG_INVARG;
350        case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
351      default: return REG_ASSERT;      default: return REG_ASSERT;
352      }      }
353    }    }

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