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Revision 1454 - (hide annotations) (download)
Sun Feb 9 18:55:03 2014 UTC (2 months, 1 week ago) by ph10
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Implement pcre_stack_guard.

1 nigel 3 /*************************************************
2     * Perl-Compatible Regular Expressions *
3     *************************************************/
4    
5 nigel 77 /* PCRE is a library of functions to support regular expressions whose syntax
6     and semantics are as close as possible to those of the Perl 5 language.
7 nigel 3
8 nigel 77 Written by Philip Hazel
9 ph10 1454 Copyright (c) 1997-2014 University of Cambridge
10 nigel 3
11     -----------------------------------------------------------------------------
12 nigel 75 Redistribution and use in source and binary forms, with or without
13     modification, are permitted provided that the following conditions are met:
14 nigel 3
15 nigel 75 * Redistributions of source code must retain the above copyright notice,
16     this list of conditions and the following disclaimer.
17 nigel 3
18 nigel 75 * 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 nigel 3
22 nigel 75 * 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 nigel 29
26 nigel 75 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27     AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28     IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29     ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30     LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36     POSSIBILITY OF SUCH DAMAGE.
37 nigel 3 -----------------------------------------------------------------------------
38     */
39    
40 nigel 77
41     /* This module is a wrapper that provides a POSIX API to the underlying PCRE
42     functions. */
43    
44    
45 ph10 200 #ifdef HAVE_CONFIG_H
46 ph10 236 #include "config.h"
47 ph10 200 #endif
48 ph10 199
49    
50 ph10 200 /* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
51 ph10 199 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 ph10 545 /* We include pcre.h before pcre_internal.h so that the PCRE library functions
61 ph10 536 are declared as "import" for Windows by defining PCRE_EXP_DECL as "import".
62 ph10 545 This is needed even though pcre_internal.h itself includes pcre.h, because it
63 ph10 536 does so after it has set PCRE_EXP_DECL to "export" if it is not already set. */
64    
65     #include "pcre.h"
66 nigel 77 #include "pcre_internal.h"
67 nigel 3 #include "pcreposix.h"
68    
69    
70 nigel 77 /* Table to translate PCRE compile time error codes into POSIX error codes. */
71 nigel 3
72 nigel 73 static const int eint[] = {
73 nigel 77 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 ph10 461 /* 5 */
79 nigel 77 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 ph10 461 /* 10 */
85 nigel 77 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 ph10 461 /* 15 */
91 nigel 77 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 ph10 461 /* 20 */
97 nigel 77 REG_ESIZE, /* regular expression too large */
98     REG_ESPACE, /* failed to get memory */
99 ph10 418 REG_EPAREN, /* unmatched parentheses */
100 nigel 77 REG_ASSERT, /* internal error: code overflow */
101     REG_BADPAT, /* unrecognized character after (?< */
102 ph10 461 /* 25 */
103 nigel 77 REG_BADPAT, /* lookbehind assertion is not fixed length */
104 nigel 91 REG_BADPAT, /* malformed number or name after (?( */
105 nigel 93 REG_BADPAT, /* conditional group contains more than two branches */
106 nigel 77 REG_BADPAT, /* assertion expected after (?( */
107 ph10 166 REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
108 ph10 461 /* 30 */
109 nigel 77 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 ph10 1370 REG_BADPAT, /* character value in \x{} or \o{} is too large */
114 ph10 461 /* 35 */
115 nigel 77 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 ph10 461 /* 40 */
121 nigel 77 REG_BADPAT, /* recursive call could loop indefinitely */
122     REG_BADPAT, /* unrecognized character after (?P */
123 nigel 93 REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
124 nigel 91 REG_BADPAT, /* two named subpatterns have the same name */
125 nigel 77 REG_BADPAT, /* invalid UTF-8 string */
126 ph10 461 /* 45 */
127 nigel 77 REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
128     REG_BADPAT, /* malformed \P or \p sequence */
129 nigel 91 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 ph10 461 /* 50 */
133 nigel 91 REG_BADPAT, /* repeated subpattern is too long */
134 nigel 93 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 ph10 461 /* 55 */
139 nigel 93 REG_BADPAT, /* repeating a DEFINE group is not allowed */
140     REG_INVARG, /* inconsistent NEWLINE options */
141 ph10 166 REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
142 ph10 418 REG_BADPAT, /* a numbered reference must not be zero */
143 ph10 510 REG_BADPAT, /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
144 ph10 418 /* 60 */
145 ph10 461 REG_BADPAT, /* (*VERB) not recognized */
146 ph10 268 REG_BADPAT, /* number is too big */
147 ph10 286 REG_BADPAT, /* subpattern name expected */
148 ph10 336 REG_BADPAT, /* digit expected after (?+ */
149 ph10 457 REG_BADPAT, /* ] is an invalid data character in JavaScript compatibility mode */
150     /* 65 */
151 ph10 510 REG_BADPAT, /* different names for subpatterns of the same number are not allowed */
152     REG_BADPAT, /* (*MARK) must have an argument */
153 ph10 518 REG_INVARG, /* this version of PCRE is not compiled with PCRE_UCP support */
154 ph10 579 REG_BADPAT, /* \c must be followed by an ASCII character */
155 ph10 654 REG_BADPAT, /* \k is not followed by a braced, angle-bracketed, or quoted name */
156 ph10 747 /* 70 */
157 ph10 836 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 chpe 1055 REG_BADPAT, /* disallowed UTF-8/16/32 code point (>= 0xd800 && <= 0xdfff) */
161 ph10 964 REG_BADPAT, /* invalid UTF-16 string (should not occur) */
162     /* 75 */
163 ph10 978 REG_BADPAT, /* overlong MARK name */
164 chpe 1055 REG_BADPAT, /* character value in \u.... sequence is too large */
165 ph10 1309 REG_BADPAT, /* invalid UTF-32 string (should not occur) */
166 ph10 1370 REG_BADPAT, /* setting UTF is disabled by the application */
167 ph10 1404 REG_BADPAT, /* non-hex character in \\x{} (closing brace missing?) */
168     /* 80 */
169     REG_BADPAT, /* non-octal character in \o{} (closing brace missing?) */
170 ph10 1389 REG_BADPAT, /* missing opening brace after \o */
171 ph10 1392 REG_BADPAT, /* parentheses too deeply nested */
172 ph10 1404 REG_BADPAT, /* invalid range in character class */
173 ph10 1454 REG_BADPAT, /* group name must start with a non-digit */
174     /* 85 */
175     REG_BADPAT /* parentheses too deeply nested (stack check) */
176 nigel 3 };
177    
178     /* Table of texts corresponding to POSIX error codes */
179    
180 nigel 73 static const char *const pstring[] = {
181 nigel 3 "", /* Dummy for value 0 */
182     "internal error", /* REG_ASSERT */
183     "invalid repeat counts in {}", /* BADBR */
184     "pattern error", /* BADPAT */
185     "? * + invalid", /* BADRPT */
186     "unbalanced {}", /* EBRACE */
187     "unbalanced []", /* EBRACK */
188     "collation error - not relevant", /* ECOLLATE */
189     "bad class", /* ECTYPE */
190     "bad escape sequence", /* EESCAPE */
191     "empty expression", /* EMPTY */
192     "unbalanced ()", /* EPAREN */
193     "bad range inside []", /* ERANGE */
194     "expression too big", /* ESIZE */
195     "failed to get memory", /* ESPACE */
196     "bad back reference", /* ESUBREG */
197     "bad argument", /* INVARG */
198     "match failed" /* NOMATCH */
199     };
200    
201    
202    
203    
204     /*************************************************
205     * Translate error code to string *
206     *************************************************/
207    
208 ph10 359 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
209 nigel 3 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
210     {
211 nigel 7 const char *message, *addmessage;
212     size_t length, addlength;
213 nigel 3
214 nigel 7 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
215 nigel 3 "unknown error code" : pstring[errcode];
216 nigel 7 length = strlen(message) + 1;
217 nigel 3
218 nigel 7 addmessage = " at offset ";
219     addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
220     strlen(addmessage) + 6 : 0;
221 nigel 3
222     if (errbuf_size > 0)
223     {
224 nigel 7 if (addlength > 0 && errbuf_size >= length + addlength)
225 nigel 23 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
226 nigel 3 else
227     {
228     strncpy(errbuf, message, errbuf_size - 1);
229     errbuf[errbuf_size-1] = 0;
230     }
231     }
232    
233 nigel 7 return length + addlength;
234 nigel 3 }
235    
236    
237    
238    
239     /*************************************************
240     * Free store held by a regex *
241     *************************************************/
242    
243 ph10 359 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
244 nigel 3 regfree(regex_t *preg)
245     {
246 ph10 836 (PUBL(free))(preg->re_pcre);
247 nigel 3 }
248    
249    
250    
251    
252     /*************************************************
253     * Compile a regular expression *
254     *************************************************/
255    
256     /*
257     Arguments:
258     preg points to a structure for recording the compiled expression
259     pattern the pattern to compile
260     cflags compilation flags
261    
262     Returns: 0 on success
263     various non-zero codes on failure
264     */
265    
266 ph10 359 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
267 nigel 3 regcomp(regex_t *preg, const char *pattern, int cflags)
268     {
269 nigel 7 const char *errorptr;
270 nigel 3 int erroffset;
271 nigel 77 int errorcode;
272 nigel 3 int options = 0;
273 ph10 1024 int re_nsub = 0;
274 nigel 3
275 ph10 432 if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
276     if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
277     if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
278     if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
279     if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
280 ph10 518 if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
281 ph10 432 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
282 nigel 3
283 nigel 77 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
284     &erroffset, NULL);
285 nigel 3 preg->re_erroffset = erroffset;
286    
287 ph10 461 /* Safety: if the error code is too big for the translation vector (which
288 ph10 418 should not happen, but we all make mistakes), return REG_BADPAT. */
289 nigel 3
290 ph10 461 if (preg->re_pcre == NULL)
291 ph10 418 {
292 ph10 904 return (errorcode < (int)(sizeof(eint)/sizeof(const int)))?
293 ph10 418 eint[errorcode] : REG_BADPAT;
294 ph10 461 }
295 ph10 418
296 ph10 836 (void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT,
297 ph10 1024 &re_nsub);
298 ph10 1221 preg->re_nsub = (size_t)re_nsub;
299 nigel 3 return 0;
300     }
301    
302    
303    
304    
305     /*************************************************
306     * Match a regular expression *
307     *************************************************/
308    
309 nigel 41 /* Unfortunately, PCRE requires 3 ints of working space for each captured
310     substring, so we have to get and release working store instead of just using
311     the POSIX structures as was done in earlier releases when PCRE needed only 2
312 nigel 63 ints. However, if the number of possible capturing brackets is small, use a
313     block of store on the stack, to reduce the use of malloc/free. The threshold is
314 nigel 87 in a macro that can be changed at configure time.
315 nigel 41
316 nigel 87 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
317     be set. When this is the case, the nmatch and pmatch arguments are ignored, and
318     the only result is yes/no/error. */
319    
320 ph10 359 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
321 nigel 69 regexec(const regex_t *preg, const char *string, size_t nmatch,
322 nigel 3 regmatch_t pmatch[], int eflags)
323     {
324 ph10 332 int rc, so, eo;
325 nigel 3 int options = 0;
326 nigel 41 int *ovector = NULL;
327 nigel 63 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
328     BOOL allocated_ovector = FALSE;
329 nigel 87 BOOL nosub =
330 chpe 1055 (REAL_PCRE_OPTIONS((const pcre *)preg->re_pcre) & PCRE_NO_AUTO_CAPTURE) != 0;
331 nigel 3
332     if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
333     if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
334 ph10 388 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
335 nigel 3
336 nigel 69 ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
337 nigel 3
338 ph10 461 /* When no string data is being returned, or no vector has been passed in which
339 ph10 432 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
340     the return data is large enough. */
341 nigel 87
342 ph10 432 if (nosub || pmatch == NULL) nmatch = 0;
343 nigel 87
344     else if (nmatch > 0)
345 nigel 41 {
346 nigel 63 if (nmatch <= POSIX_MALLOC_THRESHOLD)
347     {
348     ovector = &(small_ovector[0]);
349     }
350     else
351     {
352 nigel 87 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
353 nigel 63 ovector = (int *)malloc(sizeof(int) * nmatch * 3);
354     if (ovector == NULL) return REG_ESPACE;
355     allocated_ovector = TRUE;
356     }
357 nigel 41 }
358    
359 ph10 332 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
360     The man page from OS X says "REG_STARTEND affects only the location of the
361 ph10 345 string, not how it is matched". That is why the "so" value is used to bump the
362 ph10 332 start location rather than being passed as a PCRE "starting offset". */
363    
364 ph10 345 if ((eflags & REG_STARTEND) != 0)
365 ph10 332 {
366     so = pmatch[0].rm_so;
367     eo = pmatch[0].rm_eo;
368 ph10 345 }
369     else
370 ph10 332 {
371     so = 0;
372 ph10 530 eo = (int)strlen(string);
373 ph10 332 }
374    
375     rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
376 ph10 530 0, options, ovector, (int)(nmatch * 3));
377 nigel 3
378 ph10 530 if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
379 nigel 3
380 ph10 499 /* Successful match */
381    
382 nigel 41 if (rc >= 0)
383 nigel 3 {
384 nigel 7 size_t i;
385 nigel 87 if (!nosub)
386 nigel 41 {
387 nigel 87 for (i = 0; i < (size_t)rc; i++)
388     {
389     pmatch[i].rm_so = ovector[i*2];
390     pmatch[i].rm_eo = ovector[i*2+1];
391     }
392     if (allocated_ovector) free(ovector);
393     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
394 nigel 41 }
395 nigel 3 return 0;
396     }
397    
398 ph10 499 /* Unsuccessful match */
399    
400     if (allocated_ovector) free(ovector);
401     switch(rc)
402 nigel 3 {
403 ph10 499 /* ========================================================================== */
404     /* These cases are never obeyed. This is a fudge that causes a compile-time
405     error if the vector eint, which is indexed by compile-time error number, is
406     not the correct length. It seems to be the only way to do such a check at
407     compile time, as the sizeof() operator does not work in the C preprocessor.
408 ph10 507 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
409 ph10 499
410     case 0:
411     case (sizeof(eint)/sizeof(int) == ERRCOUNT):
412     return REG_ASSERT;
413     /* ========================================================================== */
414    
415     case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
416     case PCRE_ERROR_NULL: return REG_INVARG;
417     case PCRE_ERROR_BADOPTION: return REG_INVARG;
418     case PCRE_ERROR_BADMAGIC: return REG_INVARG;
419     case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
420     case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
421     case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
422     case PCRE_ERROR_BADUTF8: return REG_INVARG;
423     case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
424 ph10 836 case PCRE_ERROR_BADMODE: return REG_INVARG;
425 ph10 499 default: return REG_ASSERT;
426 nigel 3 }
427     }
428    
429     /* End of pcreposix.c */

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