/[pcre]/code/trunk/pcreposix.c
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revision 51 by nigel, Sat Feb 24 21:39:37 2007 UTC revision 848 by ph10, Wed Jan 4 16:34:01 2012 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) 1997-2012 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    /* We include pcre.h before pcre_internal.h so that the PCRE library functions
61    are declared as "import" for Windows by defining PCRE_EXP_DECL as "import".
62    This is needed even though pcre_internal.h itself includes pcre.h, because it
63    does so after it has set PCRE_EXP_DECL to "export" if it is not already set. */
64    
65    #include "pcre.h"
66    #include "pcre_internal.h"
67    #include "pcreposix.h"
68    
69    
70  /* Corresponding tables of PCRE error messages and POSIX error codes. */  /* Table to translate PCRE compile time error codes into POSIX error codes. */
71    
72  static const char *estring[] = {  static const int eint[] = {
73    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,    0,           /* no error */
74    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,    REG_EESCAPE, /* \ at end of pattern */
75    ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,    REG_EESCAPE, /* \c at end of pattern */
76    ERR31 };    REG_EESCAPE, /* unrecognized character follows \ */
77      REG_BADBR,   /* numbers out of order in {} quantifier */
78  static int eint[] = {    /* 5 */
79    REG_EESCAPE, /* "\\ at end of pattern" */    REG_BADBR,   /* number too big in {} quantifier */
80    REG_EESCAPE, /* "\\c at end of pattern" */    REG_EBRACK,  /* missing terminating ] for character class */
81    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_ECTYPE,  /* invalid escape sequence in character class */
82    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_ERANGE,  /* range out of order in character class */
83    REG_BADBR,   /* "number too big in {} quantifier" */    REG_BADRPT,  /* nothing to repeat */
84    REG_EBRACK,  /* "missing terminating ] for character class" */    /* 10 */
85    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
86    REG_ERANGE,  /* "range out of order in character class" */    REG_ASSERT,  /* internal error: unexpected repeat */
87    REG_BADRPT,  /* "nothing to repeat" */    REG_BADPAT,  /* unrecognized character after (? */
88    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
89    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_EPAREN,  /* missing ) */
90    REG_BADPAT,  /* "unrecognized character after (?" */    /* 15 */
91    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    REG_ESUBREG, /* reference to non-existent subpattern */
92    REG_EPAREN,  /* "missing )" */    REG_INVARG,  /* erroffset passed as NULL */
93    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_INVARG,  /* unknown option bit(s) set */
94    REG_INVARG,  /* "erroffset passed as NULL" */    REG_EPAREN,  /* missing ) after comment */
95    REG_INVARG,  /* "unknown option bit(s) set" */    REG_ESIZE,   /* parentheses nested too deeply */
96    REG_EPAREN,  /* "missing ) after comment" */    /* 20 */
97    REG_ESIZE,   /* "too many sets of parentheses" */    REG_ESIZE,   /* regular expression too large */
98    REG_ESIZE,   /* "regular expression too large" */    REG_ESPACE,  /* failed to get memory */
99    REG_ESPACE,  /* "failed to get memory" */    REG_EPAREN,  /* unmatched parentheses */
100    REG_EPAREN,  /* "unmatched brackets" */    REG_ASSERT,  /* internal error: code overflow */
101    REG_ASSERT,  /* "internal error: code overflow" */    REG_BADPAT,  /* unrecognized character after (?< */
102    REG_BADPAT,  /* "unrecognized character after (?<" */    /* 25 */
103    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
104    REG_BADPAT,  /* "malformed number after (?(" */    REG_BADPAT,  /* malformed number or name after (?( */
105    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_BADPAT,  /* conditional group contains more than two branches */
106    REG_BADPAT,  /* "assertion expected after (?(" */    REG_BADPAT,  /* assertion expected after (?( */
107    REG_BADPAT,  /* "(?p must be followed by )" */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
108    REG_ECTYPE,  /* "unknown POSIX class name" */    /* 30 */
109    REG_BADPAT,  /* "POSIX collating elements are not supported" */    REG_ECTYPE,  /* unknown POSIX class name */
110    REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */    REG_BADPAT,  /* POSIX collating elements are not supported */
111    REG_BADPAT,  /* "characters with values > 255 are not yet supported in classes" */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
112    REG_BADPAT,  /* "character value in \x{...} sequence is too large" */    REG_BADPAT,  /* spare error */
113    REG_BADPAT   /* "invalid condition (?(0)" */    REG_BADPAT,  /* character value in \x{...} sequence is too large */
114      /* 35 */
115      REG_BADPAT,  /* invalid condition (?(0) */
116      REG_BADPAT,  /* \C not allowed in lookbehind assertion */
117      REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
118      REG_BADPAT,  /* number after (?C is > 255 */
119      REG_BADPAT,  /* closing ) for (?C expected */
120      /* 40 */
121      REG_BADPAT,  /* recursive call could loop indefinitely */
122      REG_BADPAT,  /* unrecognized character after (?P */
123      REG_BADPAT,  /* syntax error in subpattern name (missing terminator) */
124      REG_BADPAT,  /* two named subpatterns have the same name */
125      REG_BADPAT,  /* invalid UTF-8 string */
126      /* 45 */
127      REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */
128      REG_BADPAT,  /* malformed \P or \p sequence */
129      REG_BADPAT,  /* unknown property name after \P or \p */
130      REG_BADPAT,  /* subpattern name is too long (maximum 32 characters) */
131      REG_BADPAT,  /* too many named subpatterns (maximum 10,000) */
132      /* 50 */
133      REG_BADPAT,  /* repeated subpattern is too long */
134      REG_BADPAT,  /* octal value is greater than \377 (not in UTF-8 mode) */
135      REG_BADPAT,  /* internal error: overran compiling workspace */
136      REG_BADPAT,  /* internal error: previously-checked referenced subpattern not found */
137      REG_BADPAT,  /* DEFINE group contains more than one branch */
138      /* 55 */
139      REG_BADPAT,  /* repeating a DEFINE group is not allowed */
140      REG_INVARG,  /* inconsistent NEWLINE options */
141      REG_BADPAT,  /* \g is not followed followed by an (optionally braced) non-zero number */
142      REG_BADPAT,  /* a numbered reference must not be zero */
143      REG_BADPAT,  /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
144      /* 60 */
145      REG_BADPAT,  /* (*VERB) not recognized */
146      REG_BADPAT,  /* number is too big */
147      REG_BADPAT,  /* subpattern name expected */
148      REG_BADPAT,  /* digit expected after (?+ */
149      REG_BADPAT,  /* ] is an invalid data character in JavaScript compatibility mode */
150      /* 65 */
151      REG_BADPAT,  /* different names for subpatterns of the same number are not allowed */
152      REG_BADPAT,  /* (*MARK) must have an argument */
153      REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UCP support */
154      REG_BADPAT,  /* \c must be followed by an ASCII character */
155      REG_BADPAT,  /* \k is not followed by a braced, angle-bracketed, or quoted name */
156      /* 70 */
157      REG_BADPAT,  /* internal error: unknown opcode in find_fixedlength() */
158      REG_BADPAT,  /* \N is not supported in a class */
159      REG_BADPAT,  /* too many forward references */
160      REG_BADPAT,  /* disallowed UTF-8/16 code point (>= 0xd800 && <= 0xdfff) */
161      REG_BADPAT   /* invalid UTF-16 string (should not occur) */
162  };  };
163    
164  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
165    
166  static const char *pstring[] = {  static const char *const pstring[] = {
167    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
168    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
169    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 114  static const char *pstring[] = { Line 188  static const char *pstring[] = {
188    
189    
190  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
191  *          Translate error code to string        *  *          Translate error code to string        *
192  *************************************************/  *************************************************/
193    
194  size_t  PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
195  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)
196  {  {
197  const char *message, *addmessage;  const char *message, *addmessage;
# Line 170  return length + addlength; Line 226  return length + addlength;
226  *           Free store held by a regex           *  *           Free store held by a regex           *
227  *************************************************/  *************************************************/
228    
229  void  PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
230  regfree(regex_t *preg)  regfree(regex_t *preg)
231  {  {
232  (pcre_free)(preg->re_pcre);  (PUBL(free))(preg->re_pcre);
233  }  }
234    
235    
# Line 193  Returns:      0 on success Line 249  Returns:      0 on success
249                various non-zero codes on failure                various non-zero codes on failure
250  */  */
251    
252  int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
253  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
254  {  {
255  const char *errorptr;  const char *errorptr;
256  int erroffset;  int erroffset;
257    int errorcode;
258  int options = 0;  int options = 0;
259    
260  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
261  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
262    if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
263    if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
264    if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
265    if ((cflags & REG_UCP) != 0)      options |= PCRE_UCP;
266    if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
267    
268  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
269      &erroffset, NULL);
270  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
271    
272  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  /* Safety: if the error code is too big for the translation vector (which
273    should not happen, but we all make mistakes), return REG_BADPAT. */
274    
275  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  if (preg->re_pcre == NULL)
276      {
277      return (errorcode < sizeof(eint)/sizeof(const int))?
278        eint[errorcode] : REG_BADPAT;
279      }
280    
281    (void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT,
282      &(preg->re_nsub));
283  return 0;  return 0;
284  }  }
285    
# Line 222  return 0; Line 293  return 0;
293  /* Unfortunately, PCRE requires 3 ints of working space for each captured  /* Unfortunately, PCRE requires 3 ints of working space for each captured
294  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
295  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
296  ints. */  ints. However, if the number of possible capturing brackets is small, use a
297    block of store on the stack, to reduce the use of malloc/free. The threshold is
298    in a macro that can be changed at configure time.
299    
300    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
301    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
302    the only result is yes/no/error. */
303    
304  int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
305  regexec(regex_t *preg, const char *string, size_t nmatch,  regexec(const regex_t *preg, const char *string, size_t nmatch,
306    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
307  {  {
308  int rc;  int rc, so, eo;
309  int options = 0;  int options = 0;
310  int *ovector = NULL;  int *ovector = NULL;
311    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
312    BOOL allocated_ovector = FALSE;
313    BOOL nosub =
314      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
315    
316  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
317  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
318    if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
319    
320    ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
321    
322  preg->re_erroffset = (size_t)(-1);   /* Only has meaning after compile */  /* When no string data is being returned, or no vector has been passed in which
323    to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
324    the return data is large enough. */
325    
326  if (nmatch > 0)  if (nosub || pmatch == NULL) nmatch = 0;
327    
328    else if (nmatch > 0)
329    {    {
330    ovector = (int *)malloc(sizeof(int) * nmatch * 3);    if (nmatch <= POSIX_MALLOC_THRESHOLD)
331    if (ovector == NULL) return REG_ESPACE;      {
332        ovector = &(small_ovector[0]);
333        }
334      else
335        {
336        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
337        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
338        if (ovector == NULL) return REG_ESPACE;
339        allocated_ovector = TRUE;
340        }
341    }    }
342    
343  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), 0, options,  /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
344    ovector, nmatch * 3);  The man page from OS X says "REG_STARTEND affects only the location of the
345    string, not how it is matched". That is why the "so" value is used to bump the
346    start location rather than being passed as a PCRE "starting offset". */
347    
348  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if ((eflags & REG_STARTEND) != 0)
349      {
350      so = pmatch[0].rm_so;
351      eo = pmatch[0].rm_eo;
352      }
353    else
354      {
355      so = 0;
356      eo = (int)strlen(string);
357      }
358    
359    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
360      0, options, ovector, (int)(nmatch * 3));
361    
362    if (rc == 0) rc = (int)nmatch;    /* All captured slots were filled in */
363    
364    /* Successful match */
365    
366  if (rc >= 0)  if (rc >= 0)
367    {    {
368    size_t i;    size_t i;
369    for (i = 0; i < rc; i++)    if (!nosub)
370      {      {
371      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
372      pmatch[i].rm_eo = ovector[i*2+1];        {
373          pmatch[i].rm_so = ovector[i*2];
374          pmatch[i].rm_eo = ovector[i*2+1];
375          }
376        if (allocated_ovector) free(ovector);
377        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
378      }      }
   if (ovector != NULL) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
379    return 0;    return 0;
380    }    }
381    
382  else  /* Unsuccessful match */
383    
384    if (allocated_ovector) free(ovector);
385    switch(rc)
386    {    {
387    if (ovector != NULL) free(ovector);  /* ========================================================================== */
388    switch(rc)    /* These cases are never obeyed. This is a fudge that causes a compile-time
389      {    error if the vector eint, which is indexed by compile-time error number, is
390      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    not the correct length. It seems to be the only way to do such a check at
391      case PCRE_ERROR_NULL: return REG_INVARG;    compile time, as the sizeof() operator does not work in the C preprocessor.
392      case PCRE_ERROR_BADOPTION: return REG_INVARG;    As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
393      case PCRE_ERROR_BADMAGIC: return REG_INVARG;  
394      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;    case 0:
395      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;    case (sizeof(eint)/sizeof(int) == ERRCOUNT):
396      default: return REG_ASSERT;    return REG_ASSERT;
397      }  /* ========================================================================== */
398    
399      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
400      case PCRE_ERROR_NULL: return REG_INVARG;
401      case PCRE_ERROR_BADOPTION: return REG_INVARG;
402      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
403      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
404      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
405      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
406      case PCRE_ERROR_BADUTF8: return REG_INVARG;
407      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
408      case PCRE_ERROR_BADMODE: return REG_INVARG;
409      default: return REG_ASSERT;
410    }    }
411  }  }
412    

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