1/*************************************************
2*      Perl-Compatible Regular Expressions       *
3*************************************************/
4
5/* PCRE is a library of functions to support regular expressions whose syntax
6and semantics are as close as possible to those of the Perl 5 language.
7
8                       Written by Philip Hazel
9           Copyright (c) 1997-2014 University of Cambridge
10
11-----------------------------------------------------------------------------
12Redistribution and use in source and binary forms, with or without
13modification, are permitted provided that the following conditions are met:
14
15    * 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      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
26THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36POSSIBILITY OF SUCH DAMAGE.
37-----------------------------------------------------------------------------
38*/
39
40
41/* This module is a wrapper that provides a POSIX API to the underlying PCRE
42functions. */
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
51compiling these functions. This must come before including pcreposix.h, where
52they are set for an application (using these functions) if they have not
53previously 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
61are declared as "import" for Windows by defining PCRE_EXP_DECL as "import".
62This is needed even though pcre_internal.h itself includes pcre.h, because it
63does 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
72static const int eint[] = {
73  0,           /* no error */
74  REG_EESCAPE, /* \ at end of pattern */
75  REG_EESCAPE, /* \c at end of pattern */
76  REG_EESCAPE, /* unrecognized character follows \ */
77  REG_BADBR,   /* numbers out of order in {} quantifier */
78  /* 5 */
79  REG_BADBR,   /* number too big in {} quantifier */
80  REG_EBRACK,  /* missing terminating ] for character class */
81  REG_ECTYPE,  /* invalid escape sequence in character class */
82  REG_ERANGE,  /* range out of order in character class */
83  REG_BADRPT,  /* nothing to repeat */
84  /* 10 */
85  REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
86  REG_ASSERT,  /* internal error: unexpected repeat */
87  REG_BADPAT,  /* unrecognized character after (? */
88  REG_BADPAT,  /* POSIX named classes are supported only within a class */
89  REG_EPAREN,  /* missing ) */
90  /* 15 */
91  REG_ESUBREG, /* reference to non-existent subpattern */
92  REG_INVARG,  /* erroffset passed as NULL */
93  REG_INVARG,  /* unknown option bit(s) set */
94  REG_EPAREN,  /* missing ) after comment */
95  REG_ESIZE,   /* parentheses nested too deeply */
96  /* 20 */
97  REG_ESIZE,   /* regular expression too large */
98  REG_ESPACE,  /* failed to get memory */
99  REG_EPAREN,  /* unmatched parentheses */
100  REG_ASSERT,  /* internal error: code overflow */
101  REG_BADPAT,  /* unrecognized character after (?< */
102  /* 25 */
103  REG_BADPAT,  /* lookbehind assertion is not fixed length */
104  REG_BADPAT,  /* malformed number or name after (?( */
105  REG_BADPAT,  /* conditional group contains more than two branches */
106  REG_BADPAT,  /* assertion expected after (?( */
107  REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
108  /* 30 */
109  REG_ECTYPE,  /* unknown POSIX class name */
110  REG_BADPAT,  /* POSIX collating elements are not supported */
111  REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
112  REG_BADPAT,  /* spare error */
113  REG_BADPAT,  /* character value in \x{} or \o{} 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-8/16/32 code point (>= 0xd800 && <= 0xdfff) */
161  REG_BADPAT,  /* invalid UTF-16 string (should not occur) */
162  /* 75 */
163  REG_BADPAT,  /* overlong MARK name */
164  REG_BADPAT,  /* character value in \u.... sequence is too large */
165  REG_BADPAT,  /* invalid UTF-32 string (should not occur) */
166  REG_BADPAT,  /* setting UTF is disabled by the application */
167  REG_BADPAT,  /* non-hex character in \\x{} (closing brace missing?) */
168  /* 80 */
169  REG_BADPAT,  /* non-octal character in \o{} (closing brace missing?) */
170  REG_BADPAT,  /* missing opening brace after \o */
171  REG_BADPAT,  /* parentheses too deeply nested */
172  REG_BADPAT,  /* invalid range in character class */
173  REG_BADPAT,  /* group name must start with a non-digit */
174  /* 85 */
175  REG_BADPAT,  /* parentheses too deeply nested (stack check) */
176  REG_BADPAT   /* missing digits in \x{} or \o{} */
177};
178
179/* Table of texts corresponding to POSIX error codes */
180
181static const char *const pstring[] = {
182  "",                                /* Dummy for value 0 */
183  "internal error",                  /* REG_ASSERT */
184  "invalid repeat counts in {}",     /* BADBR      */
185  "pattern error",                   /* BADPAT     */
186  "? * + invalid",                   /* BADRPT     */
187  "unbalanced {}",                   /* EBRACE     */
188  "unbalanced []",                   /* EBRACK     */
189  "collation error - not relevant",  /* ECOLLATE   */
190  "bad class",                       /* ECTYPE     */
191  "bad escape sequence",             /* EESCAPE    */
192  "empty expression",                /* EMPTY      */
193  "unbalanced ()",                   /* EPAREN     */
194  "bad range inside []",             /* ERANGE     */
195  "expression too big",              /* ESIZE      */
196  "failed to get memory",            /* ESPACE     */
197  "bad back reference",              /* ESUBREG    */
198  "bad argument",                    /* INVARG     */
199  "match failed"                     /* NOMATCH    */
200};
201
202
203
204
205/*************************************************
206*          Translate error code to string        *
207*************************************************/
208
209PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
210regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
211{
212const char *message, *addmessage;
213size_t length, addlength;
214
215message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
216  "unknown error code" : pstring[errcode];
217length = strlen(message) + 1;
218
219addmessage = " at offset ";
220addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
221  strlen(addmessage) + 6 : 0;
222
223if (errbuf_size > 0)
224  {
225  if (addlength > 0 && errbuf_size >= length + addlength)
226    sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
227  else
228    {
229    strncpy(errbuf, message, errbuf_size - 1);
230    errbuf[errbuf_size-1] = 0;
231    }
232  }
233
234return length + addlength;
235}
236
237
238
239
240/*************************************************
241*           Free store held by a regex           *
242*************************************************/
243
244PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
245regfree(regex_t *preg)
246{
247(PUBL(free))(preg->re_pcre);
248}
249
250
251
252
253/*************************************************
254*            Compile a regular expression        *
255*************************************************/
256
257/*
258Arguments:
259  preg        points to a structure for recording the compiled expression
260  pattern     the pattern to compile
261  cflags      compilation flags
262
263Returns:      0 on success
264              various non-zero codes on failure
265*/
266
267PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
268regcomp(regex_t *preg, const char *pattern, int cflags)
269{
270const char *errorptr;
271int erroffset;
272int errorcode;
273int options = 0;
274int re_nsub = 0;
275
276if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
277if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
278if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
279if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
280if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
281if ((cflags & REG_UCP) != 0)      options |= PCRE_UCP;
282if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
283
284preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
285  &erroffset, NULL);
286preg->re_erroffset = erroffset;
287
288/* Safety: if the error code is too big for the translation vector (which
289should not happen, but we all make mistakes), return REG_BADPAT. */
290
291if (preg->re_pcre == NULL)
292  {
293  return (errorcode < (int)(sizeof(eint)/sizeof(const int)))?
294    eint[errorcode] : REG_BADPAT;
295  }
296
297(void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT,
298  &re_nsub);
299preg->re_nsub = (size_t)re_nsub;
300return 0;
301}
302
303
304
305
306/*************************************************
307*              Match a regular expression        *
308*************************************************/
309
310/* Unfortunately, PCRE requires 3 ints of working space for each captured
311substring, so we have to get and release working store instead of just using
312the POSIX structures as was done in earlier releases when PCRE needed only 2
313ints. However, if the number of possible capturing brackets is small, use a
314block of store on the stack, to reduce the use of malloc/free. The threshold is
315in a macro that can be changed at configure time.
316
317If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
318be set. When this is the case, the nmatch and pmatch arguments are ignored, and
319the only result is yes/no/error. */
320
321PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
322regexec(const regex_t *preg, const char *string, size_t nmatch,
323  regmatch_t pmatch[], int eflags)
324{
325int rc, so, eo;
326int options = 0;
327int *ovector = NULL;
328int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
329BOOL allocated_ovector = FALSE;
330BOOL nosub =
331  (REAL_PCRE_OPTIONS((const pcre *)preg->re_pcre) & PCRE_NO_AUTO_CAPTURE) != 0;
332
333if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
334if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
335if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
336
337((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
338
339/* When no string data is being returned, or no vector has been passed in which
340to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
341the return data is large enough. */
342
343if (nosub || pmatch == NULL) nmatch = 0;
344
345else if (nmatch > 0)
346  {
347  if (nmatch <= POSIX_MALLOC_THRESHOLD)
348    {
349    ovector = &(small_ovector[0]);
350    }
351  else
352    {
353    if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
354    ovector = (int *)malloc(sizeof(int) * nmatch * 3);
355    if (ovector == NULL) return REG_ESPACE;
356    allocated_ovector = TRUE;
357    }
358  }
359
360/* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
361The man page from OS X says "REG_STARTEND affects only the location of the
362string, not how it is matched". That is why the "so" value is used to bump the
363start location rather than being passed as a PCRE "starting offset". */
364
365if ((eflags & REG_STARTEND) != 0)
366  {
367  so = pmatch[0].rm_so;
368  eo = pmatch[0].rm_eo;
369  }
370else
371  {
372  so = 0;
373  eo = (int)strlen(string);
374  }
375
376rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
377  0, options, ovector, (int)(nmatch * 3));
378
379if (rc == 0) rc = (int)nmatch;    /* All captured slots were filled in */
380
381/* Successful match */
382
383if (rc >= 0)
384  {
385  size_t i;
386  if (!nosub)
387    {
388    for (i = 0; i < (size_t)rc; i++)
389      {
390      pmatch[i].rm_so = ovector[i*2];
391      pmatch[i].rm_eo = ovector[i*2+1];
392      }
393    if (allocated_ovector) free(ovector);
394    for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
395    }
396  return 0;
397  }
398
399/* Unsuccessful match */
400
401if (allocated_ovector) free(ovector);
402switch(rc)
403  {
404/* ========================================================================== */
405  /* These cases are never obeyed. This is a fudge that causes a compile-time
406  error if the vector eint, which is indexed by compile-time error number, is
407  not the correct length. It seems to be the only way to do such a check at
408  compile time, as the sizeof() operator does not work in the C preprocessor.
409  As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
410
411  case 0:
412  case (sizeof(eint)/sizeof(int) == ERRCOUNT):
413  return REG_ASSERT;
414/* ========================================================================== */
415
416  case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
417  case PCRE_ERROR_NULL: return REG_INVARG;
418  case PCRE_ERROR_BADOPTION: return REG_INVARG;
419  case PCRE_ERROR_BADMAGIC: return REG_INVARG;
420  case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
421  case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
422  case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
423  case PCRE_ERROR_BADUTF8: return REG_INVARG;
424  case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
425  case PCRE_ERROR_BADMODE: return REG_INVARG;
426  default: return REG_ASSERT;
427  }
428}
429
430/* End of pcreposix.c */
431