/[pcre]/code/trunk/pcreposix.c
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revision 51 by nigel, Sat Feb 24 21:39:37 2007 UTC revision 199 by ph10, Tue Jul 31 14:39:09 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    /* 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_internal.h"
61  #include "pcreposix.h"  #include "pcreposix.h"
 #include "stdlib.h"  
62    
63    
64    
65  /* Corresponding tables of PCRE error messages and POSIX error codes. */  /* Table to translate PCRE compile time error codes into POSIX error codes. */
66    
67  static const char *estring[] = {  static const int eint[] = {
68    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,    0,           /* no error */
69    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,    REG_EESCAPE, /* \ at end of pattern */
70    ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,    REG_EESCAPE, /* \c at end of pattern */
71    ERR31 };    REG_EESCAPE, /* unrecognized character follows \ */
72      REG_BADBR,   /* numbers out of order in {} quantifier */
73  static int eint[] = {    REG_BADBR,   /* number too big in {} quantifier */
74    REG_EESCAPE, /* "\\ at end of pattern" */    REG_EBRACK,  /* missing terminating ] for character class */
75    REG_EESCAPE, /* "\\c at end of pattern" */    REG_ECTYPE,  /* invalid escape sequence in character class */
76    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_ERANGE,  /* range out of order in character class */
77    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_BADRPT,  /* nothing to repeat */
78    REG_BADBR,   /* "number too big in {} quantifier" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
79    REG_EBRACK,  /* "missing terminating ] for character class" */    REG_ASSERT,  /* internal error: unexpected repeat */
80    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_BADPAT,  /* unrecognized character after (? */
81    REG_ERANGE,  /* "range out of order in character class" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
82    REG_BADRPT,  /* "nothing to repeat" */    REG_EPAREN,  /* missing ) */
83    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_ESUBREG, /* reference to non-existent subpattern */
84    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_INVARG,  /* erroffset passed as NULL */
85    REG_BADPAT,  /* "unrecognized character after (?" */    REG_INVARG,  /* unknown option bit(s) set */
86    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    REG_EPAREN,  /* missing ) after comment */
87    REG_EPAREN,  /* "missing )" */    REG_ESIZE,   /* parentheses nested too deeply */
88    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_ESIZE,   /* regular expression too large */
89    REG_INVARG,  /* "erroffset passed as NULL" */    REG_ESPACE,  /* failed to get memory */
90    REG_INVARG,  /* "unknown option bit(s) set" */    REG_EPAREN,  /* unmatched brackets */
91    REG_EPAREN,  /* "missing ) after comment" */    REG_ASSERT,  /* internal error: code overflow */
92    REG_ESIZE,   /* "too many sets of parentheses" */    REG_BADPAT,  /* unrecognized character after (?< */
93    REG_ESIZE,   /* "regular expression too large" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
94    REG_ESPACE,  /* "failed to get memory" */    REG_BADPAT,  /* malformed number or name after (?( */
95    REG_EPAREN,  /* "unmatched brackets" */    REG_BADPAT,  /* conditional group contains more than two branches */
96    REG_ASSERT,  /* "internal error: code overflow" */    REG_BADPAT,  /* assertion expected after (?( */
97    REG_BADPAT,  /* "unrecognized character after (?<" */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
98    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_ECTYPE,  /* unknown POSIX class name */
99    REG_BADPAT,  /* "malformed number after (?(" */    REG_BADPAT,  /* POSIX collating elements are not supported */
100    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
101    REG_BADPAT,  /* "assertion expected after (?(" */    REG_BADPAT,  /* spare error */
102    REG_BADPAT,  /* "(?p must be followed by )" */    REG_BADPAT,  /* character value in \x{...} sequence is too large */
103    REG_ECTYPE,  /* "unknown POSIX class name" */    REG_BADPAT,  /* invalid condition (?(0) */
104    REG_BADPAT,  /* "POSIX collating elements are not supported" */    REG_BADPAT,  /* \C not allowed in lookbehind assertion */
105    REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */    REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
106    REG_BADPAT,  /* "characters with values > 255 are not yet supported in classes" */    REG_BADPAT,  /* number after (?C is > 255 */
107    REG_BADPAT,  /* "character value in \x{...} sequence is too large" */    REG_BADPAT,  /* closing ) for (?C expected */
108    REG_BADPAT   /* "invalid condition (?(0)" */    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  };  };
128    
129  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
130    
131  static const char *pstring[] = {  static const char *const pstring[] = {
132    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
133    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
134    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 114  static const char *pstring[] = { Line 153  static const char *pstring[] = {
153    
154    
155  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
156  *          Translate error code to string        *  *          Translate error code to string        *
157  *************************************************/  *************************************************/
158    
159  size_t  PCREPOSIX_EXP_DEFN size_t
160  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)
161  {  {
162  const char *message, *addmessage;  const char *message, *addmessage;
# Line 170  return length + addlength; Line 191  return length + addlength;
191  *           Free store held by a regex           *  *           Free store held by a regex           *
192  *************************************************/  *************************************************/
193    
194  void  PCREPOSIX_EXP_DEFN void
195  regfree(regex_t *preg)  regfree(regex_t *preg)
196  {  {
197  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 193  Returns:      0 on success Line 214  Returns:      0 on success
214                various non-zero codes on failure                various non-zero codes on failure
215  */  */
216    
217  int  PCREPOSIX_EXP_DEFN int
218  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
219  {  {
220  const char *errorptr;  const char *errorptr;
221  int erroffset;  int erroffset;
222    int errorcode;
223  int options = 0;  int options = 0;
224    
225  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)   options |= PCRE_CASELESS;
226  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
227    if ((cflags & REG_DOTALL) != 0)  options |= PCRE_DOTALL;
228    if ((cflags & REG_NOSUB) != 0)   options |= PCRE_NO_AUTO_CAPTURE;
229    if ((cflags & REG_UTF8) != 0)    options |= PCRE_UTF8;
230    
231  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
232      &erroffset, NULL);
233  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
234    
235  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  if (preg->re_pcre == NULL) return eint[errorcode];
236    
237  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
238  return 0;  return 0;
239  }  }
240    
# Line 222  return 0; Line 248  return 0;
248  /* Unfortunately, PCRE requires 3 ints of working space for each captured  /* Unfortunately, PCRE requires 3 ints of working space for each captured
249  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
250  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
251  ints. */  ints. However, if the number of possible capturing brackets is small, use a
252    block of store on the stack, to reduce the use of malloc/free. The threshold is
253    in a macro that can be changed at configure time.
254    
255    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
256    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
257    the only result is yes/no/error. */
258    
259  int  PCREPOSIX_EXP_DEFN int
260  regexec(regex_t *preg, const char *string, size_t nmatch,  regexec(const regex_t *preg, const char *string, size_t nmatch,
261    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
262  {  {
263  int rc;  int rc;
264  int options = 0;  int options = 0;
265  int *ovector = NULL;  int *ovector = NULL;
266    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
267    BOOL allocated_ovector = FALSE;
268    BOOL nosub =
269      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
270    
271  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
272  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
273    
274  preg->re_erroffset = (size_t)(-1);   /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
275    
276    /* When no string data is being returned, ensure that nmatch is zero.
277    Otherwise, ensure the vector for holding the return data is large enough. */
278    
279  if (nmatch > 0)  if (nosub) nmatch = 0;
280    
281    else if (nmatch > 0)
282    {    {
283    ovector = (int *)malloc(sizeof(int) * nmatch * 3);    if (nmatch <= POSIX_MALLOC_THRESHOLD)
284    if (ovector == NULL) return REG_ESPACE;      {
285        ovector = &(small_ovector[0]);
286        }
287      else
288        {
289        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
290        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
291        if (ovector == NULL) return REG_ESPACE;
292        allocated_ovector = TRUE;
293        }
294    }    }
295    
296  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),
297    ovector, nmatch * 3);    0, options, ovector, nmatch * 3);
298    
299  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
300    
301  if (rc >= 0)  if (rc >= 0)
302    {    {
303    size_t i;    size_t i;
304    for (i = 0; i < rc; i++)    if (!nosub)
305      {      {
306      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
307      pmatch[i].rm_eo = ovector[i*2+1];        {
308          pmatch[i].rm_so = ovector[i*2];
309          pmatch[i].rm_eo = ovector[i*2+1];
310          }
311        if (allocated_ovector) free(ovector);
312        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
313      }      }
   if (ovector != NULL) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
314    return 0;    return 0;
315    }    }
316    
317  else  else
318    {    {
319    if (ovector != NULL) free(ovector);    if (allocated_ovector) free(ovector);
320    switch(rc)    switch(rc)
321      {      {
322      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
# Line 272  else Line 325  else
325      case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
326      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
327      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
328        case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
329        case PCRE_ERROR_BADUTF8: return REG_INVARG;
330        case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
331      default: return REG_ASSERT;      default: return REG_ASSERT;
332      }      }
333    }    }

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