/[pcre]/code/trunk/pcreposix.c
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revision 27 by nigel, Sat Feb 24 21:38:49 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.  
   
 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) 1997-1999 University of Cambridge                         Written by Philip Hazel
9               Copyright (c) 1997-2008 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    /* 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    
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 };    REG_EESCAPE, /* \c at end of pattern */
71      REG_EESCAPE, /* unrecognized character follows \ */
72  static int eint[] = {    REG_BADBR,   /* numbers out of order in {} quantifier */
73    REG_EESCAPE, /* "\\ at end of pattern" */    REG_BADBR,   /* number too big in {} quantifier */
74    REG_EESCAPE, /* "\\c at end of pattern" */    REG_EBRACK,  /* missing terminating ] for character class */
75    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_ECTYPE,  /* invalid escape sequence in character class */
76    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_ERANGE,  /* range out of order in character class */
77    REG_BADBR,   /* "number too big in {} quantifier" */    REG_BADRPT,  /* nothing to repeat */
78    REG_EBRACK,  /* "missing terminating ] for character class" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
79    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_ASSERT,  /* internal error: unexpected repeat */
80    REG_ERANGE,  /* "range out of order in character class" */    REG_BADPAT,  /* unrecognized character after (? */
81    REG_BADRPT,  /* "nothing to repeat" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
82    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_EPAREN,  /* missing ) */
83    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_ESUBREG, /* reference to non-existent subpattern */
84    REG_BADPAT,  /* "unrecognized character after (?" */    REG_INVARG,  /* erroffset passed as NULL */
85    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    REG_INVARG,  /* unknown option bit(s) set */
86    REG_EPAREN,  /* "missing )" */    REG_EPAREN,  /* missing ) after comment */
87    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_ESIZE,   /* parentheses nested too deeply */
88    REG_INVARG,  /* "erroffset passed as NULL" */    REG_ESIZE,   /* regular expression too large */
89    REG_INVARG,  /* "unknown option bit(s) set" */    REG_ESPACE,  /* failed to get memory */
90    REG_EPAREN,  /* "missing ) after comment" */    REG_EPAREN,  /* unmatched brackets */
91    REG_ESIZE,   /* "too many sets of parentheses" */    REG_ASSERT,  /* internal error: code overflow */
92    REG_ESIZE,   /* "regular expression too large" */    REG_BADPAT,  /* unrecognized character after (?< */
93    REG_ESPACE,  /* "failed to get memory" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
94    REG_EPAREN,  /* "unmatched brackets" */    REG_BADPAT,  /* malformed number or name after (?( */
95    REG_ASSERT,  /* "internal error: code overflow" */    REG_BADPAT,  /* conditional group contains more than two branches */
96    REG_BADPAT,  /* "unrecognized character after (?<" */    REG_BADPAT,  /* assertion expected after (?( */
97    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
98    REG_BADPAT,  /* "malformed number after (?(" */    REG_ECTYPE,  /* unknown POSIX class name */
99    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_BADPAT,  /* POSIX collating elements are not supported */
100    REG_BADPAT   /* "assertion expected after (?(" */    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 */
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 102  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 158  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 181  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 207  return 0; Line 249  return 0;
249  *              Match a regular expression        *  *              Match a regular expression        *
250  *************************************************/  *************************************************/
251    
252  int  /* Unfortunately, PCRE requires 3 ints of working space for each captured
253  regexec(regex_t *preg, const char *string, size_t nmatch,  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
255    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    PCREPOSIX_EXP_DEFN int
264    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;
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 ((eflags & REG_STARTEND) != 0)
306      {
307      so = pmatch[0].rm_so;
308      eo = pmatch[0].rm_eo;
309      }
310    else
311      {
312      so = 0;
313      eo = strlen(string);
314      }
315    
316  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),
317    (int *)pmatch, nmatch * 2);    0, options, ovector, nmatch * 3);
318    
319  if (rc == 0) return 0;    /* All pmatch 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 = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;    if (!nosub)
325        {
326        for (i = 0; i < (size_t)rc; i++)
327          {
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        }
334    return 0;    return 0;
335    }    }
336    
337  else switch(rc)  else
338    {    {
339    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    if (allocated_ovector) free(ovector);
340    case PCRE_ERROR_NULL: return REG_INVARG;    switch(rc)
341    case PCRE_ERROR_BADOPTION: return REG_INVARG;      {
342    case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
343    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_NULL: return REG_INVARG;
344    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_BADOPTION: return REG_INVARG;
345    default: return REG_ASSERT;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
346        case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
347        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;
352        }
353    }    }
354  }  }
355    
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