/[pcre]/code/trunk/pcreposix.c
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revision 7 by nigel, Sat Feb 24 21:38:09 2007 UTC revision 507 by ph10, Wed Mar 10 16:08:01 2010 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 University of Cambridge                         Written by Philip Hazel
9               Copyright (c) 1997-2009 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  /* Corresponding tables of PCRE error messages and POSIX error codes. */  /* 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  static const char *estring[] = {  #if defined(_WIN32) && !defined(PCRE_STATIC)
56    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,  #  define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
57    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,  #  define PCREPOSIX_EXP_DEFN __declspec(dllexport)
58    ERR21, ERR22, ERR23 };  #endif
59    
60  static int eint[] = {  #include "pcre.h"
61    REG_EESCAPE, /* "\\ at end of pattern" */  #include "pcre_internal.h"
62    REG_EESCAPE, /* "\\c at end of pattern" */  #include "pcreposix.h"
63    REG_EESCAPE, /* "unrecognized character follows \\" */  
64    REG_BADBR,   /* "numbers out of order in {} quantifier" */  
65    REG_BADBR,   /* "number too big in {} quantifier" */  /* Table to translate PCRE compile time error codes into POSIX error codes. */
66    REG_EBRACK,  /* "missing terminating ] for character class" */  
67    REG_ECTYPE,  /* "invalid escape sequence in character class" */  static const int eint[] = {
68    REG_ERANGE,  /* "range out of order in character class" */    0,           /* no error */
69    REG_BADRPT,  /* "nothing to repeat" */    REG_EESCAPE, /* \ at end of pattern */
70    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_EESCAPE, /* \c at end of pattern */
71    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_EESCAPE, /* unrecognized character follows \ */
72    REG_BADPAT,  /* "unrecognized character after (?" */    REG_BADBR,   /* numbers out of order in {} quantifier */
73    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    /* 5 */
74    REG_EPAREN,  /* "missing )" */    REG_BADBR,   /* number too big in {} quantifier */
75    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_EBRACK,  /* missing terminating ] for character class */
76    REG_INVARG,  /* "erroffset passed as NULL" */    REG_ECTYPE,  /* invalid escape sequence in character class */
77    REG_INVARG,  /* "unknown option bit(s) set" */    REG_ERANGE,  /* range out of order in character class */
78    REG_EPAREN,  /* "missing ) after comment" */    REG_BADRPT,  /* nothing to repeat */
79    REG_ESIZE,   /* "too many sets of parentheses" */    /* 10 */
80    REG_ESIZE,   /* "regular expression too large" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
81    REG_ESPACE,  /* "failed to get memory" */    REG_ASSERT,  /* internal error: unexpected repeat */
82    REG_EPAREN,  /* "unmatched brackets" */    REG_BADPAT,  /* unrecognized character after (? */
83    REG_ASSERT   /* "internal error: code overflow" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
84      REG_EPAREN,  /* missing ) */
85      /* 15 */
86      REG_ESUBREG, /* reference to non-existent subpattern */
87      REG_INVARG,  /* erroffset passed as NULL */
88      REG_INVARG,  /* unknown option bit(s) set */
89      REG_EPAREN,  /* missing ) after comment */
90      REG_ESIZE,   /* parentheses nested too deeply */
91      /* 20 */
92      REG_ESIZE,   /* regular expression too large */
93      REG_ESPACE,  /* failed to get memory */
94      REG_EPAREN,  /* unmatched parentheses */
95      REG_ASSERT,  /* internal error: code overflow */
96      REG_BADPAT,  /* unrecognized character after (?< */
97      /* 25 */
98      REG_BADPAT,  /* lookbehind assertion is not fixed length */
99      REG_BADPAT,  /* malformed number or name after (?( */
100      REG_BADPAT,  /* conditional group contains more than two branches */
101      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      /* 65 */
146      REG_BADPAT   /* different names for subpatterns of the same number are not allowed */
147  };  };
148    
149  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
150    
151  static const char *pstring[] = {  static const char *const pstring[] = {
152    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
153    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
154    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 97  static const char *pstring[] = { Line 173  static const char *pstring[] = {
173    
174    
175  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
176  *          Translate error code to string        *  *          Translate error code to string        *
177  *************************************************/  *************************************************/
178    
179  size_t  PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
180  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)
181  {  {
182  const char *message, *addmessage;  const char *message, *addmessage;
# Line 135  addlength = (preg != NULL && (int)preg-> Line 193  addlength = (preg != NULL && (int)preg->
193  if (errbuf_size > 0)  if (errbuf_size > 0)
194    {    {
195    if (addlength > 0 && errbuf_size >= length + addlength)    if (addlength > 0 && errbuf_size >= length + addlength)
196      sprintf(errbuf, "%s%s%-6d", message, addmessage, preg->re_erroffset);      sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
197    else    else
198      {      {
199      strncpy(errbuf, message, errbuf_size - 1);      strncpy(errbuf, message, errbuf_size - 1);
# Line 153  return length + addlength; Line 211  return length + addlength;
211  *           Free store held by a regex           *  *           Free store held by a regex           *
212  *************************************************/  *************************************************/
213    
214  void  PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
215  regfree(regex_t *preg)  regfree(regex_t *preg)
216  {  {
217  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 176  Returns:      0 on success Line 234  Returns:      0 on success
234                various non-zero codes on failure                various non-zero codes on failure
235  */  */
236    
237  int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
238  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
239  {  {
240  const char *errorptr;  const char *errorptr;
241  int erroffset;  int erroffset;
242    int errorcode;
243  int options = 0;  int options = 0;
244    
245  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
246  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
247    if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
248    if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
249    if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
250    if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
251    
252  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
253      &erroffset, NULL);
254  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
255    
256  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  /* Safety: if the error code is too big for the translation vector (which
257    should not happen, but we all make mistakes), return REG_BADPAT. */
258    
259    if (preg->re_pcre == NULL)
260      {
261      return (errorcode < sizeof(eint)/sizeof(const int))?
262        eint[errorcode] : REG_BADPAT;
263      }
264    
265  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
266  return 0;  return 0;
267  }  }
268    
# Line 202  return 0; Line 273  return 0;
273  *              Match a regular expression        *  *              Match a regular expression        *
274  *************************************************/  *************************************************/
275    
276  int  /* Unfortunately, PCRE requires 3 ints of working space for each captured
277  regexec(regex_t *preg, const char *string, size_t nmatch,  substring, so we have to get and release working store instead of just using
278    the POSIX structures as was done in earlier releases when PCRE needed only 2
279    ints. However, if the number of possible capturing brackets is small, use a
280    block of store on the stack, to reduce the use of malloc/free. The threshold is
281    in a macro that can be changed at configure time.
282    
283    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
284    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
285    the only result is yes/no/error. */
286    
287    PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
288    regexec(const regex_t *preg, const char *string, size_t nmatch,
289    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
290  {  {
291  int rc;  int rc, so, eo;
292  int options = 0;  int options = 0;
293    int *ovector = NULL;
294    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
295    BOOL allocated_ovector = FALSE;
296    BOOL nosub =
297      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
298    
299  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
300  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
301    if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
302    
303    ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
304    
305    /* When no string data is being returned, or no vector has been passed in which
306    to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
307    the return data is large enough. */
308    
309    if (nosub || pmatch == NULL) nmatch = 0;
310    
311    else if (nmatch > 0)
312      {
313      if (nmatch <= POSIX_MALLOC_THRESHOLD)
314        {
315        ovector = &(small_ovector[0]);
316        }
317      else
318        {
319        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
320        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
321        if (ovector == NULL) return REG_ESPACE;
322        allocated_ovector = TRUE;
323        }
324      }
325    
326    /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
327    The man page from OS X says "REG_STARTEND affects only the location of the
328    string, not how it is matched". That is why the "so" value is used to bump the
329    start location rather than being passed as a PCRE "starting offset". */
330    
331  preg->re_erroffset = -1;   /* Only has meaning after compile */  if ((eflags & REG_STARTEND) != 0)
332      {
333      so = pmatch[0].rm_so;
334      eo = pmatch[0].rm_eo;
335      }
336    else
337      {
338      so = 0;
339      eo = strlen(string);
340      }
341    
342  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),
343    (int *)pmatch, nmatch * 2);    0, options, ovector, nmatch * 3);
344    
345  if (rc == 0) return 0;    /* All pmatch were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
346    
347  if (rc > 0)  /* Successful match */
348    
349    if (rc >= 0)
350    {    {
351    size_t i;    size_t i;
352    for (i = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;    if (!nosub)
353        {
354        for (i = 0; i < (size_t)rc; i++)
355          {
356          pmatch[i].rm_so = ovector[i*2];
357          pmatch[i].rm_eo = ovector[i*2+1];
358          }
359        if (allocated_ovector) free(ovector);
360        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
361        }
362    return 0;    return 0;
363    }    }
364    
365  else switch(rc)  /* Unsuccessful match */
366    
367    if (allocated_ovector) free(ovector);
368    switch(rc)
369    {    {
370    /* ========================================================================== */
371      /* These cases are never obeyed. This is a fudge that causes a compile-time
372      error if the vector eint, which is indexed by compile-time error number, is
373      not the correct length. It seems to be the only way to do such a check at
374      compile time, as the sizeof() operator does not work in the C preprocessor.
375      As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
376    
377      case 0:
378      case (sizeof(eint)/sizeof(int) == ERRCOUNT):
379      return REG_ASSERT;
380    /* ========================================================================== */
381    
382    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
   case PCRE_ERROR_BADREF: return REG_ESUBREG;  
383    case PCRE_ERROR_NULL: return REG_INVARG;    case PCRE_ERROR_NULL: return REG_INVARG;
384    case PCRE_ERROR_BADOPTION: return REG_INVARG;    case PCRE_ERROR_BADOPTION: return REG_INVARG;
385    case PCRE_ERROR_BADMAGIC: return REG_INVARG;    case PCRE_ERROR_BADMAGIC: return REG_INVARG;
386    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
387    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
388      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
389      case PCRE_ERROR_BADUTF8: return REG_INVARG;
390      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
391    default: return REG_ASSERT;    default: return REG_ASSERT;
392    }    }
393  }  }

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