/[pcre]/code/trunk/pcreposix.c
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revision 75 by nigel, Sat Feb 24 21:40:37 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) 1997-2004 University of Cambridge                         Written by Philip Hazel
9               Copyright (c) 1997-2009 University of Cambridge
10    
11  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
12  Redistribution and use in source and binary forms, with or without  Redistribution and use in source and binary forms, with or without
# Line 43  POSSIBILITY OF SUCH DAMAGE. Line 37  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    #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    
 /* Corresponding tables of PCRE error messages and POSIX error codes. */  
64    
65  static const char *const estring[] = {  /* Table to translate PCRE compile time error codes into POSIX error codes. */
   ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,  
   ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,  
   ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,  
   ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39, ERR40,  
   ERR41, ERR42, ERR43, ERR44, ERR45, ERR46, ERR47 };  
66    
67  static const int eint[] = {  static const int eint[] = {
68    REG_EESCAPE, /* "\\ at end of pattern" */    0,           /* no error */
69    REG_EESCAPE, /* "\\c at end of pattern" */    REG_EESCAPE, /* \ at end of pattern */
70    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_EESCAPE, /* \c at end of pattern */
71    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_EESCAPE, /* unrecognized character follows \ */
72    REG_BADBR,   /* "number too big in {} quantifier" */    REG_BADBR,   /* numbers out of order in {} quantifier */
73    REG_EBRACK,  /* "missing terminating ] for character class" */    /* 5 */
74    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_BADBR,   /* number too big in {} quantifier */
75    REG_ERANGE,  /* "range out of order in character class" */    REG_EBRACK,  /* missing terminating ] for character class */
76    REG_BADRPT,  /* "nothing to repeat" */    REG_ECTYPE,  /* invalid escape sequence in character class */
77    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_ERANGE,  /* range out of order in character class */
78    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_BADRPT,  /* nothing to repeat */
79    REG_BADPAT,  /* "unrecognized character after (?" */    /* 10 */
80    REG_BADPAT,  /* "POSIX named classes are supported only within a class" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
81    REG_EPAREN,  /* "missing )" */    REG_ASSERT,  /* internal error: unexpected repeat */
82    REG_ESUBREG, /* "reference to non-existent subpattern" */    REG_BADPAT,  /* unrecognized character after (? */
83    REG_INVARG,  /* "erroffset passed as NULL" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
84    REG_INVARG,  /* "unknown option bit(s) set" */    REG_EPAREN,  /* missing ) */
85    REG_EPAREN,  /* "missing ) after comment" */    /* 15 */
86    REG_ESIZE,   /* "parentheses nested too deeply" */    REG_ESUBREG, /* reference to non-existent subpattern */
87    REG_ESIZE,   /* "regular expression too large" */    REG_INVARG,  /* erroffset passed as NULL */
88    REG_ESPACE,  /* "failed to get memory" */    REG_INVARG,  /* unknown option bit(s) set */
89    REG_EPAREN,  /* "unmatched brackets" */    REG_EPAREN,  /* missing ) after comment */
90    REG_ASSERT,  /* "internal error: code overflow" */    REG_ESIZE,   /* parentheses nested too deeply */
91    REG_BADPAT,  /* "unrecognized character after (?<" */    /* 20 */
92    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_ESIZE,   /* regular expression too large */
93    REG_BADPAT,  /* "malformed number after (?(" */    REG_ESPACE,  /* failed to get memory */
94    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_EPAREN,  /* unmatched parentheses */
95    REG_BADPAT,  /* "assertion expected after (?(" */    REG_ASSERT,  /* internal error: code overflow */
96    REG_BADPAT,  /* "(?R or (?digits must be followed by )" */    REG_BADPAT,  /* unrecognized character after (?< */
97    REG_ECTYPE,  /* "unknown POSIX class name" */    /* 25 */
98    REG_BADPAT,  /* "POSIX collating elements are not supported" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
99    REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */    REG_BADPAT,  /* malformed number or name after (?( */
100    REG_BADPAT,  /* "spare error" */    REG_BADPAT,  /* conditional group contains more than two branches */
101    REG_BADPAT,  /* "character value in \x{...} sequence is too large" */    REG_BADPAT,  /* assertion expected after (?( */
102    REG_BADPAT,  /* "invalid condition (?(0)" */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
103    REG_BADPAT,  /* "\\C not allowed in lookbehind assertion" */    /* 30 */
104    REG_EESCAPE, /* "PCRE does not support \\L, \\l, \\N, \\U, or \\u" */    REG_ECTYPE,  /* unknown POSIX class name */
105    REG_BADPAT,  /* "number after (?C is > 255" */    REG_BADPAT,  /* POSIX collating elements are not supported */
106    REG_BADPAT,  /* "closing ) for (?C expected" */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
107    REG_BADPAT,  /* "recursive call could loop indefinitely" */    REG_BADPAT,  /* spare error */
108    REG_BADPAT,  /* "unrecognized character after (?P" */    REG_BADPAT,  /* character value in \x{...} sequence is too large */
109    REG_BADPAT,  /* "syntax error after (?P" */    /* 35 */
110    REG_BADPAT,  /* "two named groups have the same name" */    REG_BADPAT,  /* invalid condition (?(0) */
111    REG_BADPAT,  /* "invalid UTF-8 string" */    REG_BADPAT,  /* \C not allowed in lookbehind assertion */
112    REG_BADPAT,  /* "support for \\P, \\p, and \\X has not been compiled" */    REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
113    REG_BADPAT,  /* "malformed \\P or \\p sequence" */    REG_BADPAT,  /* number after (?C is > 255 */
114    REG_BADPAT   /* "unknown property name after \\P or \\p" */    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 */
# Line 135  static const char *const pstring[] = { Line 173  static const char *const 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  EXPORT 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 191  return length + addlength; Line 211  return length + addlength;
211  *           Free store held by a regex           *  *           Free store held by a regex           *
212  *************************************************/  *************************************************/
213    
214  EXPORT 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 214  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  EXPORT 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, NULL);  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((const pcre *)preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
266  return 0;  return 0;
# Line 245  substring, so we have to get and release Line 278  substring, so we have to get and release
278  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
279  ints. However, if the number of possible capturing brackets is small, use a  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  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. */  in a macro that can be changed at configure time.
282    
283  EXPORT int  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,  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;  int *ovector = NULL;
294  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
295  BOOL allocated_ovector = FALSE;  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 */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
304    
305  if (nmatch > 0)  /* 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)    if (nmatch <= POSIX_MALLOC_THRESHOLD)
314      {      {
# Line 270  if (nmatch > 0) Line 316  if (nmatch > 0)
316      }      }
317    else    else
318      {      {
319        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
320      ovector = (int *)malloc(sizeof(int) * nmatch * 3);      ovector = (int *)malloc(sizeof(int) * nmatch * 3);
321      if (ovector == NULL) return REG_ESPACE;      if (ovector == NULL) return REG_ESPACE;
322      allocated_ovector = TRUE;      allocated_ovector = TRUE;
323      }      }
324    }    }
325    
326  rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),  /* 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    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((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
343    0, options, ovector, nmatch * 3);    0, options, ovector, nmatch * 3);
344    
345  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
346    
347    /* Successful match */
348    
349  if (rc >= 0)  if (rc >= 0)
350    {    {
351    size_t i;    size_t i;
352    for (i = 0; i < (size_t)rc; i++)    if (!nosub)
353      {      {
354      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
355      pmatch[i].rm_eo = ovector[i*2+1];        {
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      }      }
   if (allocated_ovector) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
362    return 0;    return 0;
363    }    }
364    
365  else  /* Unsuccessful match */
366    
367    if (allocated_ovector) free(ovector);
368    switch(rc)
369    {    {
370    if (allocated_ovector) free(ovector);  /* ========================================================================== */
371    switch(rc)    /* 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      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    not the correct length. It seems to be the only way to do such a check at
374      case PCRE_ERROR_NULL: return REG_INVARG;    compile time, as the sizeof() operator does not work in the C preprocessor.
375      case PCRE_ERROR_BADOPTION: return REG_INVARG;    As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
376      case PCRE_ERROR_BADMAGIC: return REG_INVARG;  
377      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;    case 0:
378      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;    case (sizeof(eint)/sizeof(int) == ERRCOUNT):
379      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;    return REG_ASSERT;
380      case PCRE_ERROR_BADUTF8: return REG_INVARG;  /* ========================================================================== */
381      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;  
382      default: return REG_ASSERT;    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
383      }    case PCRE_ERROR_NULL: return REG_INVARG;
384      case PCRE_ERROR_BADOPTION: return REG_INVARG;
385      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
386      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
387      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;
392    }    }
393  }  }
394    

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