/[pcre]/code/trunk/pcreposix.c
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revision 286 by ph10, Mon Dec 17 14:46:11 2007 UTC revision 510 by ph10, Sat Mar 27 17:45:29 2010 UTC
# Line 6  Line 6 
6  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.
7    
8                         Written by Philip Hazel                         Written by Philip Hazel
9             Copyright (c) 1997-2007 University of Cambridge             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 70  static const int eint[] = { Line 70  static const int eint[] = {
70    REG_EESCAPE, /* \c at end of pattern */    REG_EESCAPE, /* \c at end of pattern */
71    REG_EESCAPE, /* unrecognized character follows \ */    REG_EESCAPE, /* unrecognized character follows \ */
72    REG_BADBR,   /* numbers out of order in {} quantifier */    REG_BADBR,   /* numbers out of order in {} quantifier */
73      /* 5 */
74    REG_BADBR,   /* number too big in {} quantifier */    REG_BADBR,   /* number too big in {} quantifier */
75    REG_EBRACK,  /* missing terminating ] for character class */    REG_EBRACK,  /* missing terminating ] for character class */
76    REG_ECTYPE,  /* invalid escape sequence in character class */    REG_ECTYPE,  /* invalid escape sequence in character class */
77    REG_ERANGE,  /* range out of order in character class */    REG_ERANGE,  /* range out of order in character class */
78    REG_BADRPT,  /* nothing to repeat */    REG_BADRPT,  /* nothing to repeat */
79      /* 10 */
80    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
81    REG_ASSERT,  /* internal error: unexpected repeat */    REG_ASSERT,  /* internal error: unexpected repeat */
82    REG_BADPAT,  /* unrecognized character after (? */    REG_BADPAT,  /* unrecognized character after (? */
83    REG_BADPAT,  /* POSIX named classes are supported only within a class */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
84    REG_EPAREN,  /* missing ) */    REG_EPAREN,  /* missing ) */
85      /* 15 */
86    REG_ESUBREG, /* reference to non-existent subpattern */    REG_ESUBREG, /* reference to non-existent subpattern */
87    REG_INVARG,  /* erroffset passed as NULL */    REG_INVARG,  /* erroffset passed as NULL */
88    REG_INVARG,  /* unknown option bit(s) set */    REG_INVARG,  /* unknown option bit(s) set */
89    REG_EPAREN,  /* missing ) after comment */    REG_EPAREN,  /* missing ) after comment */
90    REG_ESIZE,   /* parentheses nested too deeply */    REG_ESIZE,   /* parentheses nested too deeply */
91      /* 20 */
92    REG_ESIZE,   /* regular expression too large */    REG_ESIZE,   /* regular expression too large */
93    REG_ESPACE,  /* failed to get memory */    REG_ESPACE,  /* failed to get memory */
94    REG_EPAREN,  /* unmatched brackets */    REG_EPAREN,  /* unmatched parentheses */
95    REG_ASSERT,  /* internal error: code overflow */    REG_ASSERT,  /* internal error: code overflow */
96    REG_BADPAT,  /* unrecognized character after (?< */    REG_BADPAT,  /* unrecognized character after (?< */
97      /* 25 */
98    REG_BADPAT,  /* lookbehind assertion is not fixed length */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
99    REG_BADPAT,  /* malformed number or name after (?( */    REG_BADPAT,  /* malformed number or name after (?( */
100    REG_BADPAT,  /* conditional group contains more than two branches */    REG_BADPAT,  /* conditional group contains more than two branches */
101    REG_BADPAT,  /* assertion expected after (?( */    REG_BADPAT,  /* assertion expected after (?( */
102    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
103      /* 30 */
104    REG_ECTYPE,  /* unknown POSIX class name */    REG_ECTYPE,  /* unknown POSIX class name */
105    REG_BADPAT,  /* POSIX collating elements are not supported */    REG_BADPAT,  /* POSIX collating elements are not supported */
106    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
107    REG_BADPAT,  /* spare error */    REG_BADPAT,  /* spare error */
108    REG_BADPAT,  /* character value in \x{...} sequence is too large */    REG_BADPAT,  /* character value in \x{...} sequence is too large */
109      /* 35 */
110    REG_BADPAT,  /* invalid condition (?(0) */    REG_BADPAT,  /* invalid condition (?(0) */
111    REG_BADPAT,  /* \C not allowed in lookbehind assertion */    REG_BADPAT,  /* \C not allowed in lookbehind assertion */
112    REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */    REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
113    REG_BADPAT,  /* number after (?C is > 255 */    REG_BADPAT,  /* number after (?C is > 255 */
114    REG_BADPAT,  /* closing ) for (?C expected */    REG_BADPAT,  /* closing ) for (?C expected */
115      /* 40 */
116    REG_BADPAT,  /* recursive call could loop indefinitely */    REG_BADPAT,  /* recursive call could loop indefinitely */
117    REG_BADPAT,  /* unrecognized character after (?P */    REG_BADPAT,  /* unrecognized character after (?P */
118    REG_BADPAT,  /* syntax error in subpattern name (missing terminator) */    REG_BADPAT,  /* syntax error in subpattern name (missing terminator) */
119    REG_BADPAT,  /* two named subpatterns have the same name */    REG_BADPAT,  /* two named subpatterns have the same name */
120    REG_BADPAT,  /* invalid UTF-8 string */    REG_BADPAT,  /* invalid UTF-8 string */
121      /* 45 */
122    REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */    REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */
123    REG_BADPAT,  /* malformed \P or \p sequence */    REG_BADPAT,  /* malformed \P or \p sequence */
124    REG_BADPAT,  /* unknown property name after \P or \p */    REG_BADPAT,  /* unknown property name after \P or \p */
125    REG_BADPAT,  /* subpattern name is too long (maximum 32 characters) */    REG_BADPAT,  /* subpattern name is too long (maximum 32 characters) */
126    REG_BADPAT,  /* too many named subpatterns (maximum 10,000) */    REG_BADPAT,  /* too many named subpatterns (maximum 10,000) */
127      /* 50 */
128    REG_BADPAT,  /* repeated subpattern is too long */    REG_BADPAT,  /* repeated subpattern is too long */
129    REG_BADPAT,  /* octal value is greater than \377 (not in UTF-8 mode) */    REG_BADPAT,  /* octal value is greater than \377 (not in UTF-8 mode) */
130    REG_BADPAT,  /* internal error: overran compiling workspace */    REG_BADPAT,  /* internal error: overran compiling workspace */
131    REG_BADPAT,  /* internal error: previously-checked referenced subpattern not found */    REG_BADPAT,  /* internal error: previously-checked referenced subpattern not found */
132    REG_BADPAT,  /* DEFINE group contains more than one branch */    REG_BADPAT,  /* DEFINE group contains more than one branch */
133      /* 55 */
134    REG_BADPAT,  /* repeating a DEFINE group is not allowed */    REG_BADPAT,  /* repeating a DEFINE group is not allowed */
135    REG_INVARG,  /* inconsistent NEWLINE options */    REG_INVARG,  /* inconsistent NEWLINE options */
136    REG_BADPAT,  /* \g is not followed followed by an (optionally braced) non-zero number */    REG_BADPAT,  /* \g is not followed followed by an (optionally braced) non-zero number */
137    REG_BADPAT,  /* (?+ or (?- must be followed by a non-zero number */    REG_BADPAT,  /* a numbered reference must not be zero */
138      REG_BADPAT,  /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
139      /* 60 */
140      REG_BADPAT,  /* (*VERB) not recognized */
141    REG_BADPAT,  /* number is too big */    REG_BADPAT,  /* number is too big */
142    REG_BADPAT,  /* subpattern name expected */    REG_BADPAT,  /* subpattern name expected */
143    REG_BADPAT   /* digit expected after (?+ */    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      REG_BADPAT,  /* (*MARK) must have an argument */
148  };  };
149    
150  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
# Line 159  static const char *const pstring[] = { Line 177  static const char *const pstring[] = {
177  *          Translate error code to string        *  *          Translate error code to string        *
178  *************************************************/  *************************************************/
179    
180  PCREPOSIX_EXP_DEFN size_t  PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
181  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)
182  {  {
183  const char *message, *addmessage;  const char *message, *addmessage;
# Line 194  return length + addlength; Line 212  return length + addlength;
212  *           Free store held by a regex           *  *           Free store held by a regex           *
213  *************************************************/  *************************************************/
214    
215  PCREPOSIX_EXP_DEFN void  PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
216  regfree(regex_t *preg)  regfree(regex_t *preg)
217  {  {
218  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 217  Returns:      0 on success Line 235  Returns:      0 on success
235                various non-zero codes on failure                various non-zero codes on failure
236  */  */
237    
238  PCREPOSIX_EXP_DEFN int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
239  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
240  {  {
241  const char *errorptr;  const char *errorptr;
# Line 225  int erroffset; Line 243  int erroffset;
243  int errorcode;  int errorcode;
244  int options = 0;  int options = 0;
245    
246  if ((cflags & REG_ICASE) != 0)   options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
247  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
248  if ((cflags & REG_DOTALL) != 0)  options |= PCRE_DOTALL;  if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
249  if ((cflags & REG_NOSUB) != 0)   options |= PCRE_NO_AUTO_CAPTURE;  if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
250  if ((cflags & REG_UTF8) != 0)    options |= PCRE_UTF8;  if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
251    if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
252    
253  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
254    &erroffset, NULL);    &erroffset, NULL);
255  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
256    
257  if (preg->re_pcre == NULL) return eint[errorcode];  /* Safety: if the error code is too big for the translation vector (which
258    should not happen, but we all make mistakes), return REG_BADPAT. */
259    
260    if (preg->re_pcre == NULL)
261      {
262      return (errorcode < sizeof(eint)/sizeof(const int))?
263        eint[errorcode] : REG_BADPAT;
264      }
265    
266  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
267  return 0;  return 0;
# Line 259  If REG_NOSUB was specified at compile ti Line 285  If REG_NOSUB was specified at compile ti
285  be set. When this is the case, the nmatch and pmatch arguments are ignored, and  be set. When this is the case, the nmatch and pmatch arguments are ignored, and
286  the only result is yes/no/error. */  the only result is yes/no/error. */
287    
288  PCREPOSIX_EXP_DEFN int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
289  regexec(const regex_t *preg, const char *string, size_t nmatch,  regexec(const regex_t *preg, const char *string, size_t nmatch,
290    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
291  {  {
292  int rc;  int rc, so, eo;
293  int options = 0;  int options = 0;
294  int *ovector = NULL;  int *ovector = NULL;
295  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
# Line 273  BOOL nosub = Line 299  BOOL nosub =
299    
300  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
301  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
302    if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
303    
304  ((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 */
305    
306  /* When no string data is being returned, ensure that nmatch is zero.  /* When no string data is being returned, or no vector has been passed in which
307  Otherwise, ensure the vector for holding the return data is large enough. */  to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
308    the return data is large enough. */
309    
310  if (nosub) nmatch = 0;  if (nosub || pmatch == NULL) nmatch = 0;
311    
312  else if (nmatch > 0)  else if (nmatch > 0)
313    {    {
# Line 296  else if (nmatch > 0) Line 324  else if (nmatch > 0)
324      }      }
325    }    }
326    
327  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.
328    The man page from OS X says "REG_STARTEND affects only the location of the
329    string, not how it is matched". That is why the "so" value is used to bump the
330    start location rather than being passed as a PCRE "starting offset". */
331    
332    if ((eflags & REG_STARTEND) != 0)
333      {
334      so = pmatch[0].rm_so;
335      eo = pmatch[0].rm_eo;
336      }
337    else
338      {
339      so = 0;
340      eo = strlen(string);
341      }
342    
343    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
344    0, options, ovector, nmatch * 3);    0, options, ovector, nmatch * 3);
345    
346  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
347    
348    /* Successful match */
349    
350  if (rc >= 0)  if (rc >= 0)
351    {    {
352    size_t i;    size_t i;
# Line 317  if (rc >= 0) Line 363  if (rc >= 0)
363    return 0;    return 0;
364    }    }
365    
366  else  /* Unsuccessful match */
367    
368    if (allocated_ovector) free(ovector);
369    switch(rc)
370    {    {
371    if (allocated_ovector) free(ovector);  /* ========================================================================== */
372    switch(rc)    /* These cases are never obeyed. This is a fudge that causes a compile-time
373      {    error if the vector eint, which is indexed by compile-time error number, is
374      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    not the correct length. It seems to be the only way to do such a check at
375      case PCRE_ERROR_NULL: return REG_INVARG;    compile time, as the sizeof() operator does not work in the C preprocessor.
376      case PCRE_ERROR_BADOPTION: return REG_INVARG;    As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
377      case PCRE_ERROR_BADMAGIC: return REG_INVARG;  
378      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;    case 0:
379      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;    case (sizeof(eint)/sizeof(int) == ERRCOUNT):
380      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;    return REG_ASSERT;
381      case PCRE_ERROR_BADUTF8: return REG_INVARG;  /* ========================================================================== */
382      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;  
383      default: return REG_ASSERT;    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
384      }    case PCRE_ERROR_NULL: return REG_INVARG;
385      case PCRE_ERROR_BADOPTION: return REG_INVARG;
386      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
387      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
388      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
389      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
390      case PCRE_ERROR_BADUTF8: return REG_INVARG;
391      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
392      default: return REG_ASSERT;
393    }    }
394  }  }
395    

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