/[pcre]/code/trunk/pcreposix.c
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revision 49 by nigel, Sat Feb 24 21:39:33 2007 UTC revision 268 by ph10, Thu Nov 15 10:28:09 2007 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) 1997-2007 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    
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    
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  /* Corresponding tables of PCRE error messages and POSIX error codes. */  #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  static const char *estring[] = {  #include "pcre.h"
61    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,  #include "pcre_internal.h"
62    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,  #include "pcreposix.h"
63    ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,  
64    ERR31 };  
65    /* Table to translate PCRE compile time error codes into POSIX error codes. */
66  static int eint[] = {  
67    REG_EESCAPE, /* "\\ at end of pattern" */  static const int eint[] = {
68    REG_EESCAPE, /* "\\c at end of pattern" */    0,           /* no error */
69    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_EESCAPE, /* \ at end of pattern */
70    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_EESCAPE, /* \c at end of pattern */
71    REG_BADBR,   /* "number too big in {} quantifier" */    REG_EESCAPE, /* unrecognized character follows \ */
72    REG_EBRACK,  /* "missing terminating ] for character class" */    REG_BADBR,   /* numbers out of order in {} quantifier */
73    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_BADBR,   /* number too big in {} quantifier */
74    REG_ERANGE,  /* "range out of order in character class" */    REG_EBRACK,  /* missing terminating ] for character class */
75    REG_BADRPT,  /* "nothing to repeat" */    REG_ECTYPE,  /* invalid escape sequence in character class */
76    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_ERANGE,  /* range out of order in character class */
77    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_BADRPT,  /* nothing to repeat */
78    REG_BADPAT,  /* "unrecognized character after (?" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
79    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    REG_ASSERT,  /* internal error: unexpected repeat */
80    REG_EPAREN,  /* "missing )" */    REG_BADPAT,  /* unrecognized character after (? */
81    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
82    REG_INVARG,  /* "erroffset passed as NULL" */    REG_EPAREN,  /* missing ) */
83    REG_INVARG,  /* "unknown option bit(s) set" */    REG_ESUBREG, /* reference to non-existent subpattern */
84    REG_EPAREN,  /* "missing ) after comment" */    REG_INVARG,  /* erroffset passed as NULL */
85    REG_ESIZE,   /* "too many sets of parentheses" */    REG_INVARG,  /* unknown option bit(s) set */
86    REG_ESIZE,   /* "regular expression too large" */    REG_EPAREN,  /* missing ) after comment */
87    REG_ESPACE,  /* "failed to get memory" */    REG_ESIZE,   /* parentheses nested too deeply */
88    REG_EPAREN,  /* "unmatched brackets" */    REG_ESIZE,   /* regular expression too large */
89    REG_ASSERT,  /* "internal error: code overflow" */    REG_ESPACE,  /* failed to get memory */
90    REG_BADPAT,  /* "unrecognized character after (?<" */    REG_EPAREN,  /* unmatched brackets */
91    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_ASSERT,  /* internal error: code overflow */
92    REG_BADPAT,  /* "malformed number after (?(" */    REG_BADPAT,  /* unrecognized character after (?< */
93    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
94    REG_BADPAT,  /* "assertion expected after (?(" */    REG_BADPAT,  /* malformed number or name after (?( */
95    REG_BADPAT,  /* "(?p must be followed by )" */    REG_BADPAT,  /* conditional group contains more than two branches */
96    REG_ECTYPE,  /* "unknown POSIX class name" */    REG_BADPAT,  /* assertion expected after (?( */
97    REG_BADPAT,  /* "POSIX collating elements are not supported" */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
98    REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */    REG_ECTYPE,  /* unknown POSIX class name */
99    REG_BADPAT,  /* "characters with values > 255 are not yet supported in classes" */    REG_BADPAT,  /* POSIX collating elements are not supported */
100    REG_BADPAT   /* "character value in \x{...} sequence is too large" */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
101      REG_BADPAT,  /* spare error */
102      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 after (?& */
129  };  };
130    
131  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
132    
133  static const char *pstring[] = {  static const char *const pstring[] = {
134    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
135    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
136    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 113  static const char *pstring[] = { Line 155  static const char *pstring[] = {
155    
156    
157  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
158  *          Translate error code to string        *  *          Translate error code to string        *
159  *************************************************/  *************************************************/
160    
161  size_t  PCREPOSIX_EXP_DEFN size_t
162  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)
163  {  {
164  const char *message, *addmessage;  const char *message, *addmessage;
# Line 169  return length + addlength; Line 193  return length + addlength;
193  *           Free store held by a regex           *  *           Free store held by a regex           *
194  *************************************************/  *************************************************/
195    
196  void  PCREPOSIX_EXP_DEFN void
197  regfree(regex_t *preg)  regfree(regex_t *preg)
198  {  {
199  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 192  Returns: 0 on success Line 216  Returns: 0 on success
216                various non-zero codes on failure                various non-zero codes on failure
217  */  */
218    
219  int  PCREPOSIX_EXP_DEFN int
220  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
221  {  {
222  const char *errorptr;  const char *errorptr;
223  int erroffset;  int erroffset;
224    int errorcode;
225  int options = 0;  int options = 0;
226    
227  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)   options |= PCRE_CASELESS;
228  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
229    if ((cflags & REG_DOTALL) != 0)  options |= PCRE_DOTALL;
230    if ((cflags & REG_NOSUB) != 0)   options |= PCRE_NO_AUTO_CAPTURE;
231    if ((cflags & REG_UTF8) != 0)    options |= PCRE_UTF8;
232    
233  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
234      &erroffset, NULL);
235  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
236    
237  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  if (preg->re_pcre == NULL) return eint[errorcode];
238    
239  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
240  return 0;  return 0;
241  }  }
242    
# Line 221  return 0; Line 250  return 0;
250  /* Unfortunately, PCRE requires 3 ints of working space for each captured  /* Unfortunately, PCRE requires 3 ints of working space for each captured
251  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
252  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
253  ints. */  ints. However, if the number of possible capturing brackets is small, use a
254    block of store on the stack, to reduce the use of malloc/free. The threshold is
255    in a macro that can be changed at configure time.
256    
257    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
258    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
259    the only result is yes/no/error. */
260    
261  int  PCREPOSIX_EXP_DEFN int
262  regexec(regex_t *preg, const char *string, size_t nmatch,  regexec(const regex_t *preg, const char *string, size_t nmatch,
263    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
264  {  {
265  int rc;  int rc;
266  int options = 0;  int options = 0;
267  int *ovector = NULL;  int *ovector = NULL;
268    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
269    BOOL allocated_ovector = FALSE;
270    BOOL nosub =
271      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
272    
273  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
274  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
275    
276  preg->re_erroffset = (size_t)(-1);   /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
277    
278    /* When no string data is being returned, ensure that nmatch is zero.
279    Otherwise, ensure the vector for holding the return data is large enough. */
280    
281  if (nmatch > 0)  if (nosub) nmatch = 0;
282    
283    else if (nmatch > 0)
284    {    {
285    ovector = (int *)malloc(sizeof(int) * nmatch * 3);    if (nmatch <= POSIX_MALLOC_THRESHOLD)
286    if (ovector == NULL) return REG_ESPACE;      {
287        ovector = &(small_ovector[0]);
288        }
289      else
290        {
291        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
292        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
293        if (ovector == NULL) return REG_ESPACE;
294        allocated_ovector = TRUE;
295        }
296    }    }
297    
298  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), 0, options,  rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
299    ovector, nmatch * 3);    0, options, ovector, nmatch * 3);
300    
301  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
302    
303  if (rc >= 0)  if (rc >= 0)
304    {    {
305    size_t i;    size_t i;
306    for (i = 0; i < rc; i++)    if (!nosub)
307      {      {
308      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
309      pmatch[i].rm_eo = ovector[i*2+1];        {
310          pmatch[i].rm_so = ovector[i*2];
311          pmatch[i].rm_eo = ovector[i*2+1];
312          }
313        if (allocated_ovector) free(ovector);
314        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
315      }      }
   if (ovector != NULL) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
316    return 0;    return 0;
317    }    }
318    
319  else  else
320    {    {
321    if (ovector != NULL) free(ovector);    if (allocated_ovector) free(ovector);
322    switch(rc)    switch(rc)
323      {      {
324      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
# Line 271  else Line 327  else
327      case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
328      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
329      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
330        case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
331        case PCRE_ERROR_BADUTF8: return REG_INVARG;
332        case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
333      default: return REG_ASSERT;      default: return REG_ASSERT;
334      }      }
335    }    }

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