1: /*************************************************
2: * Perl-Compatible Regular Expressions *
3: *************************************************/
4:
5: /* 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:
8: 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
13: modification, 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:
26: 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: -----------------------------------------------------------------------------
38: */
39:
40:
41: /* This module is a wrapper that provides a POSIX API to the underlying PCRE
42: 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: /* 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[] = {
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{...} sequence 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: };
161:
162: /* Table of texts corresponding to POSIX error codes */
163:
164: static const char *const pstring[] = {
165: "", /* Dummy for value 0 */
166: "internal error", /* REG_ASSERT */
167: "invalid repeat counts in {}", /* BADBR */
168: "pattern error", /* BADPAT */
169: "? * + invalid", /* BADRPT */
170: "unbalanced {}", /* EBRACE */
171: "unbalanced []", /* EBRACK */
172: "collation error - not relevant", /* ECOLLATE */
173: "bad class", /* ECTYPE */
174: "bad escape sequence", /* EESCAPE */
175: "empty expression", /* EMPTY */
176: "unbalanced ()", /* EPAREN */
177: "bad range inside []", /* ERANGE */
178: "expression too big", /* ESIZE */
179: "failed to get memory", /* ESPACE */
180: "bad back reference", /* ESUBREG */
181: "bad argument", /* INVARG */
182: "match failed" /* NOMATCH */
183: };
184:
185:
186:
187:
188: /*************************************************
189: * Translate error code to string *
190: *************************************************/
191:
192: PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
193: regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
194: {
195: const char *message, *addmessage;
196: size_t length, addlength;
197:
198: message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
199: "unknown error code" : pstring[errcode];
200: length = strlen(message) + 1;
201:
202: addmessage = " at offset ";
203: addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
204: strlen(addmessage) + 6 : 0;
205:
206: if (errbuf_size > 0)
207: {
208: if (addlength > 0 && errbuf_size >= length + addlength)
209: sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
210: else
211: {
212: strncpy(errbuf, message, errbuf_size - 1);
213: errbuf[errbuf_size-1] = 0;
214: }
215: }
216:
217: return length + addlength;
218: }
219:
220:
221:
222:
223: /*************************************************
224: * Free store held by a regex *
225: *************************************************/
226:
227: PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
228: regfree(regex_t *preg)
229: {
230: (pcre_free)(preg->re_pcre);
231: }
232:
233:
234:
235:
236: /*************************************************
237: * Compile a regular expression *
238: *************************************************/
239:
240: /*
241: Arguments:
242: preg points to a structure for recording the compiled expression
243: pattern the pattern to compile
244: cflags compilation flags
245:
246: Returns: 0 on success
247: various non-zero codes on failure
248: */
249:
250: PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
251: regcomp(regex_t *preg, const char *pattern, int cflags)
252: {
253: const char *errorptr;
254: int erroffset;
255: int errorcode;
256: int options = 0;
257:
258: if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
259: if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
260: if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
261: if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
262: if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
263: if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
264: if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
265:
266: preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
267: &erroffset, NULL);
268: preg->re_erroffset = erroffset;
269:
270: /* Safety: if the error code is too big for the translation vector (which
271: should not happen, but we all make mistakes), return REG_BADPAT. */
272:
273: if (preg->re_pcre == NULL)
274: {
275: return (errorcode < sizeof(eint)/sizeof(const int))?
276: eint[errorcode] : REG_BADPAT;
277: }
278:
279: preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
280: return 0;
281: }
282:
283:
284:
285:
286: /*************************************************
287: * Match a regular expression *
288: *************************************************/
289:
290: /* Unfortunately, PCRE requires 3 ints of working space for each captured
291: substring, so we have to get and release working store instead of just using
292: the POSIX structures as was done in earlier releases when PCRE needed only 2
293: ints. However, if the number of possible capturing brackets is small, use a
294: block of store on the stack, to reduce the use of malloc/free. The threshold is
295: in a macro that can be changed at configure time.
296:
297: If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
298: be set. When this is the case, the nmatch and pmatch arguments are ignored, and
299: the only result is yes/no/error. */
300:
301: PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
302: regexec(const regex_t *preg, const char *string, size_t nmatch,
303: regmatch_t pmatch[], int eflags)
304: {
305: int rc, so, eo;
306: int options = 0;
307: int *ovector = NULL;
308: int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
309: BOOL allocated_ovector = FALSE;
310: BOOL nosub =
311: (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
312:
313: if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
314: if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
315: if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
316:
317: ((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
318:
319: /* When no string data is being returned, or no vector has been passed in which
320: to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
321: the return data is large enough. */
322:
323: if (nosub || pmatch == NULL) nmatch = 0;
324:
325: else if (nmatch > 0)
326: {
327: if (nmatch <= POSIX_MALLOC_THRESHOLD)
328: {
329: ovector = &(small_ovector[0]);
330: }
331: else
332: {
333: if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
334: ovector = (int *)malloc(sizeof(int) * nmatch * 3);
335: if (ovector == NULL) return REG_ESPACE;
336: allocated_ovector = TRUE;
337: }
338: }
339:
340: /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
341: The man page from OS X says "REG_STARTEND affects only the location of the
342: string, not how it is matched". That is why the "so" value is used to bump the
343: start location rather than being passed as a PCRE "starting offset". */
344:
345: if ((eflags & REG_STARTEND) != 0)
346: {
347: so = pmatch[0].rm_so;
348: eo = pmatch[0].rm_eo;
349: }
350: else
351: {
352: so = 0;
353: eo = (int)strlen(string);
354: }
355:
356: rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
357: 0, options, ovector, (int)(nmatch * 3));
358:
359: if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
360:
361: /* Successful match */
362:
363: if (rc >= 0)
364: {
365: size_t i;
366: if (!nosub)
367: {
368: for (i = 0; i < (size_t)rc; i++)
369: {
370: pmatch[i].rm_so = ovector[i*2];
371: pmatch[i].rm_eo = ovector[i*2+1];
372: }
373: if (allocated_ovector) free(ovector);
374: for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
375: }
376: return 0;
377: }
378:
379: /* Unsuccessful match */
380:
381: if (allocated_ovector) free(ovector);
382: switch(rc)
383: {
384: /* ========================================================================== */
385: /* These cases are never obeyed. This is a fudge that causes a compile-time
386: error if the vector eint, which is indexed by compile-time error number, is
387: not the correct length. It seems to be the only way to do such a check at
388: compile time, as the sizeof() operator does not work in the C preprocessor.
389: As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
390:
391: case 0:
392: case (sizeof(eint)/sizeof(int) == ERRCOUNT):
393: return REG_ASSERT;
394: /* ========================================================================== */
395:
396: case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
397: case PCRE_ERROR_NULL: return REG_INVARG;
398: case PCRE_ERROR_BADOPTION: return REG_INVARG;
399: case PCRE_ERROR_BADMAGIC: return REG_INVARG;
400: case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
401: case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
402: case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
403: case PCRE_ERROR_BADUTF8: return REG_INVARG;
404: case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
405: default: return REG_ASSERT;
406: }
407: }
408:
409: /* End of pcreposix.c */
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