/[pcre]/code/trunk/pcreposix.c
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revision 75 by nigel, Sat Feb 24 21:40:37 2007 UTC revision 574 by ph10, Sat Nov 20 17:47:27 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) 1997-2010 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    
 /* Corresponding tables of PCRE error messages and POSIX error codes. */  
49    
50  static const char *const estring[] = {  /* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
51    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,  compiling these functions. This must come before including pcreposix.h, where
52    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,  they are set for an application (using these functions) if they have not
53    ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,  previously been set. */
54    ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39, ERR40,  
55    ERR41, ERR42, ERR43, ERR44, ERR45, ERR46, ERR47 };  #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    /* Table to translate PCRE compile time error codes into POSIX error codes. */
71    
72  static const int eint[] = {  static const int eint[] = {
73    REG_EESCAPE, /* "\\ at end of pattern" */    0,           /* no error */
74    REG_EESCAPE, /* "\\c at end of pattern" */    REG_EESCAPE, /* \ at end of pattern */
75    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_EESCAPE, /* \c at end of pattern */
76    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_EESCAPE, /* unrecognized character follows \ */
77    REG_BADBR,   /* "number too big in {} quantifier" */    REG_BADBR,   /* numbers out of order in {} quantifier */
78    REG_EBRACK,  /* "missing terminating ] for character class" */    /* 5 */
79    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_BADBR,   /* number too big in {} quantifier */
80    REG_ERANGE,  /* "range out of order in character class" */    REG_EBRACK,  /* missing terminating ] for character class */
81    REG_BADRPT,  /* "nothing to repeat" */    REG_ECTYPE,  /* invalid escape sequence in character class */
82    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_ERANGE,  /* range out of order in character class */
83    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_BADRPT,  /* nothing to repeat */
84    REG_BADPAT,  /* "unrecognized character after (?" */    /* 10 */
85    REG_BADPAT,  /* "POSIX named classes are supported only within a class" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
86    REG_EPAREN,  /* "missing )" */    REG_ASSERT,  /* internal error: unexpected repeat */
87    REG_ESUBREG, /* "reference to non-existent subpattern" */    REG_BADPAT,  /* unrecognized character after (? */
88    REG_INVARG,  /* "erroffset passed as NULL" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
89    REG_INVARG,  /* "unknown option bit(s) set" */    REG_EPAREN,  /* missing ) */
90    REG_EPAREN,  /* "missing ) after comment" */    /* 15 */
91    REG_ESIZE,   /* "parentheses nested too deeply" */    REG_ESUBREG, /* reference to non-existent subpattern */
92    REG_ESIZE,   /* "regular expression too large" */    REG_INVARG,  /* erroffset passed as NULL */
93    REG_ESPACE,  /* "failed to get memory" */    REG_INVARG,  /* unknown option bit(s) set */
94    REG_EPAREN,  /* "unmatched brackets" */    REG_EPAREN,  /* missing ) after comment */
95    REG_ASSERT,  /* "internal error: code overflow" */    REG_ESIZE,   /* parentheses nested too deeply */
96    REG_BADPAT,  /* "unrecognized character after (?<" */    /* 20 */
97    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_ESIZE,   /* regular expression too large */
98    REG_BADPAT,  /* "malformed number after (?(" */    REG_ESPACE,  /* failed to get memory */
99    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_EPAREN,  /* unmatched parentheses */
100    REG_BADPAT,  /* "assertion expected after (?(" */    REG_ASSERT,  /* internal error: code overflow */
101    REG_BADPAT,  /* "(?R or (?digits must be followed by )" */    REG_BADPAT,  /* unrecognized character after (?< */
102    REG_ECTYPE,  /* "unknown POSIX class name" */    /* 25 */
103    REG_BADPAT,  /* "POSIX collating elements are not supported" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
104    REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */    REG_BADPAT,  /* malformed number or name after (?( */
105    REG_BADPAT,  /* "spare error" */    REG_BADPAT,  /* conditional group contains more than two branches */
106    REG_BADPAT,  /* "character value in \x{...} sequence is too large" */    REG_BADPAT,  /* assertion expected after (?( */
107    REG_BADPAT,  /* "invalid condition (?(0)" */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
108    REG_BADPAT,  /* "\\C not allowed in lookbehind assertion" */    /* 30 */
109    REG_EESCAPE, /* "PCRE does not support \\L, \\l, \\N, \\U, or \\u" */    REG_ECTYPE,  /* unknown POSIX class name */
110    REG_BADPAT,  /* "number after (?C is > 255" */    REG_BADPAT,  /* POSIX collating elements are not supported */
111    REG_BADPAT,  /* "closing ) for (?C expected" */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
112    REG_BADPAT,  /* "recursive call could loop indefinitely" */    REG_BADPAT,  /* spare error */
113    REG_BADPAT,  /* "unrecognized character after (?P" */    REG_BADPAT,  /* character value in \x{...} sequence is too large */
114    REG_BADPAT,  /* "syntax error after (?P" */    /* 35 */
115    REG_BADPAT,  /* "two named groups have the same name" */    REG_BADPAT,  /* invalid condition (?(0) */
116    REG_BADPAT,  /* "invalid UTF-8 string" */    REG_BADPAT,  /* \C not allowed in lookbehind assertion */
117    REG_BADPAT,  /* "support for \\P, \\p, and \\X has not been compiled" */    REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
118    REG_BADPAT,  /* "malformed \\P or \\p sequence" */    REG_BADPAT,  /* number after (?C is > 255 */
119    REG_BADPAT   /* "unknown property name after \\P or \\p" */    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  };  };
156    
157  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
# Line 135  static const char *const pstring[] = { Line 181  static const char *const pstring[] = {
181    
182    
183  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
184  *          Translate error code to string        *  *          Translate error code to string        *
185  *************************************************/  *************************************************/
186    
187  EXPORT size_t  PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
188  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)
189  {  {
190  const char *message, *addmessage;  const char *message, *addmessage;
# Line 191  return length + addlength; Line 219  return length + addlength;
219  *           Free store held by a regex           *  *           Free store held by a regex           *
220  *************************************************/  *************************************************/
221    
222  EXPORT void  PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
223  regfree(regex_t *preg)  regfree(regex_t *preg)
224  {  {
225  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 214  Returns:      0 on success Line 242  Returns:      0 on success
242                various non-zero codes on failure                various non-zero codes on failure
243  */  */
244    
245  EXPORT int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
246  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
247  {  {
248  const char *errorptr;  const char *errorptr;
249  int erroffset;  int erroffset;
250    int errorcode;
251  int options = 0;  int options = 0;
252    
253  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
254  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
255    if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
256    if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
257    if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
258    if ((cflags & REG_UCP) != 0)      options |= PCRE_UCP;
259    if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
260    
261  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
262      &erroffset, NULL);
263  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
264    
265  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  /* Safety: if the error code is too big for the translation vector (which
266    should not happen, but we all make mistakes), return REG_BADPAT. */
267    
268    if (preg->re_pcre == NULL)
269      {
270      return (errorcode < sizeof(eint)/sizeof(const int))?
271        eint[errorcode] : REG_BADPAT;
272      }
273    
274  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
275  return 0;  return 0;
# Line 245  substring, so we have to get and release Line 287  substring, so we have to get and release
287  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
288  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
289  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
290  in a macro that can be changed at configure time. */  in a macro that can be changed at configure time.
291    
292    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
293    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
294    the only result is yes/no/error. */
295    
296  EXPORT int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
297  regexec(const regex_t *preg, const char *string, size_t nmatch,  regexec(const regex_t *preg, const char *string, size_t nmatch,
298    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
299  {  {
300  int rc;  int rc, so, eo;
301  int options = 0;  int options = 0;
302  int *ovector = NULL;  int *ovector = NULL;
303  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
304  BOOL allocated_ovector = FALSE;  BOOL allocated_ovector = FALSE;
305    BOOL nosub =
306      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
307    
308  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
309  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
310    if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
311    
312  ((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 */
313    
314  if (nmatch > 0)  /* When no string data is being returned, or no vector has been passed in which
315    to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
316    the return data is large enough. */
317    
318    if (nosub || pmatch == NULL) nmatch = 0;
319    
320    else if (nmatch > 0)
321    {    {
322    if (nmatch <= POSIX_MALLOC_THRESHOLD)    if (nmatch <= POSIX_MALLOC_THRESHOLD)
323      {      {
# Line 270  if (nmatch > 0) Line 325  if (nmatch > 0)
325      }      }
326    else    else
327      {      {
328        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
329      ovector = (int *)malloc(sizeof(int) * nmatch * 3);      ovector = (int *)malloc(sizeof(int) * nmatch * 3);
330      if (ovector == NULL) return REG_ESPACE;      if (ovector == NULL) return REG_ESPACE;
331      allocated_ovector = TRUE;      allocated_ovector = TRUE;
332      }      }
333    }    }
334    
335  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.
336    0, options, ovector, nmatch * 3);  The man page from OS X says "REG_STARTEND affects only the location of the
337    string, not how it is matched". That is why the "so" value is used to bump the
338    start location rather than being passed as a PCRE "starting offset". */
339    
340  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if ((eflags & REG_STARTEND) != 0)
341      {
342      so = pmatch[0].rm_so;
343      eo = pmatch[0].rm_eo;
344      }
345    else
346      {
347      so = 0;
348      eo = (int)strlen(string);
349      }
350    
351    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
352      0, options, ovector, (int)(nmatch * 3));
353    
354    if (rc == 0) rc = (int)nmatch;    /* All captured slots were filled in */
355    
356    /* Successful match */
357    
358  if (rc >= 0)  if (rc >= 0)
359    {    {
360    size_t i;    size_t i;
361    for (i = 0; i < (size_t)rc; i++)    if (!nosub)
362      {      {
363      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
364      pmatch[i].rm_eo = ovector[i*2+1];        {
365          pmatch[i].rm_so = ovector[i*2];
366          pmatch[i].rm_eo = ovector[i*2+1];
367          }
368        if (allocated_ovector) free(ovector);
369        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
370      }      }
   if (allocated_ovector) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
371    return 0;    return 0;
372    }    }
373    
374  else  /* Unsuccessful match */
375    
376    if (allocated_ovector) free(ovector);
377    switch(rc)
378    {    {
379    if (allocated_ovector) free(ovector);  /* ========================================================================== */
380    switch(rc)    /* These cases are never obeyed. This is a fudge that causes a compile-time
381      {    error if the vector eint, which is indexed by compile-time error number, is
382      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    not the correct length. It seems to be the only way to do such a check at
383      case PCRE_ERROR_NULL: return REG_INVARG;    compile time, as the sizeof() operator does not work in the C preprocessor.
384      case PCRE_ERROR_BADOPTION: return REG_INVARG;    As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
385      case PCRE_ERROR_BADMAGIC: return REG_INVARG;  
386      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;    case 0:
387      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;    case (sizeof(eint)/sizeof(int) == ERRCOUNT):
388      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;    return REG_ASSERT;
389      case PCRE_ERROR_BADUTF8: return REG_INVARG;  /* ========================================================================== */
390      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;  
391      default: return REG_ASSERT;    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
392      }    case PCRE_ERROR_NULL: return REG_INVARG;
393      case PCRE_ERROR_BADOPTION: return REG_INVARG;
394      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
395      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
396      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
397      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
398      case PCRE_ERROR_BADUTF8: return REG_INVARG;
399      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
400      default: return REG_ASSERT;
401    }    }
402  }  }
403    

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