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b1fe2cfc | 1 | /* Definitions for data structures and routines for the regular |
8b20806d | 2 | expression library, version 0.12. |
b1fe2cfc | 3 | |
dd52d970 | 4 | Copyright (C) 1985,89,90,91,92,93,95,2000 Free Software Foundation, Inc. |
b1fe2cfc KB |
5 | |
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
ba4a8e51 KH |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
19 | USA. */ | |
b1fe2cfc KB |
20 | |
21 | #ifndef __REGEXP_LIBRARY_H__ | |
22 | #define __REGEXP_LIBRARY_H__ | |
23 | ||
9114e279 KB |
24 | /* POSIX says that <sys/types.h> must be included (by the caller) before |
25 | <regex.h>. */ | |
26 | ||
12f975a9 | 27 | #if !defined (_POSIX_C_SOURCE) && !defined (_POSIX_SOURCE) && defined (VMS) |
9114e279 KB |
28 | /* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it |
29 | should be there. */ | |
d074788d JB |
30 | #include <stddef.h> |
31 | #endif | |
32 | ||
b1fe2cfc KB |
33 | |
34 | /* The following bits are used to determine the regexp syntax we | |
fb4a568d SM |
35 | recognize. The set/not-set meanings where historically chosen so |
36 | that Emacs syntax had the value 0. | |
37 | The bits are given in alphabetical order, and | |
b1fe2cfc KB |
38 | the definitions shifted by one from the previous bit; thus, when we |
39 | add or remove a bit, only one other definition need change. */ | |
40 | typedef unsigned reg_syntax_t; | |
41 | ||
f95d599c GM |
42 | /* If this bit is set, then even *?, +? and ?? match greedily. */ |
43 | #define RE_ALL_GREEDY (1) | |
44 | ||
b1fe2cfc KB |
45 | /* If this bit is not set, then \ inside a bracket expression is literal. |
46 | If set, then such a \ quotes the following character. */ | |
f95d599c | 47 | #define RE_BACKSLASH_ESCAPE_IN_LISTS (RE_ALL_GREEDY << 1) |
b1fe2cfc KB |
48 | |
49 | /* If this bit is not set, then + and ? are operators, and \+ and \? are | |
50 | literals. | |
51 | If set, then \+ and \? are operators and + and ? are literals. */ | |
52 | #define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1) | |
53 | ||
54 | /* If this bit is set, then character classes are supported. They are: | |
55 | [:alpha:], [:upper:], [:lower:], [:digit:], [:alnum:], [:xdigit:], | |
56 | [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:]. | |
57 | If not set, then character classes are not supported. */ | |
58 | #define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1) | |
59 | ||
60 | /* If this bit is set, then ^ and $ are always anchors (outside bracket | |
61 | expressions, of course). | |
62 | If this bit is not set, then it depends: | |
63 | ^ is an anchor if it is at the beginning of a regular | |
64 | expression or after an open-group or an alternation operator; | |
65 | $ is an anchor if it is at the end of a regular expression, or | |
66 | before a close-group or an alternation operator. | |
67 | ||
68 | This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because | |
69 | POSIX draft 11.2 says that * etc. in leading positions is undefined. | |
70 | We already implemented a previous draft which made those constructs | |
71 | invalid, though, so we haven't changed the code back. */ | |
72 | #define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1) | |
73 | ||
74 | /* If this bit is set, then special characters are always special | |
75 | regardless of where they are in the pattern. | |
76 | If this bit is not set, then special characters are special only in | |
77 | some contexts; otherwise they are ordinary. Specifically, | |
78 | * + ? and intervals are only special when not after the beginning, | |
79 | open-group, or alternation operator. */ | |
80 | #define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1) | |
81 | ||
82 | /* If this bit is set, then *, +, ?, and { cannot be first in an re or | |
83 | immediately after an alternation or begin-group operator. */ | |
84 | #define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1) | |
85 | ||
86 | /* If this bit is set, then . matches newline. | |
87 | If not set, then it doesn't. */ | |
88 | #define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1) | |
89 | ||
90 | /* If this bit is set, then . doesn't match NUL. | |
91 | If not set, then it does. */ | |
92 | #define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1) | |
93 | ||
94 | /* If this bit is set, nonmatching lists [^...] do not match newline. | |
95 | If not set, they do. */ | |
96 | #define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1) | |
97 | ||
98 | /* If this bit is set, either \{...\} or {...} defines an | |
99 | interval, depending on RE_NO_BK_BRACES. | |
100 | If not set, \{, \}, {, and } are literals. */ | |
101 | #define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1) | |
102 | ||
103 | /* If this bit is set, +, ? and | aren't recognized as operators. | |
104 | If not set, they are. */ | |
105 | #define RE_LIMITED_OPS (RE_INTERVALS << 1) | |
106 | ||
107 | /* If this bit is set, newline is an alternation operator. | |
108 | If not set, newline is literal. */ | |
109 | #define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1) | |
110 | ||
111 | /* If this bit is set, then `{...}' defines an interval, and \{ and \} | |
112 | are literals. | |
113 | If not set, then `\{...\}' defines an interval. */ | |
114 | #define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1) | |
115 | ||
116 | /* If this bit is set, (...) defines a group, and \( and \) are literals. | |
117 | If not set, \(...\) defines a group, and ( and ) are literals. */ | |
118 | #define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1) | |
119 | ||
120 | /* If this bit is set, then \<digit> matches <digit>. | |
121 | If not set, then \<digit> is a back-reference. */ | |
122 | #define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1) | |
123 | ||
124 | /* If this bit is set, then | is an alternation operator, and \| is literal. | |
125 | If not set, then \| is an alternation operator, and | is literal. */ | |
126 | #define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1) | |
127 | ||
128 | /* If this bit is set, then an ending range point collating higher | |
129 | than the starting range point, as in [z-a], is invalid. | |
130 | If not set, then when ending range point collates higher than the | |
131 | starting range point, the range is ignored. */ | |
132 | #define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1) | |
133 | ||
5cc05562 RS |
134 | /* If this bit is set, succeed as soon as we match the whole pattern, |
135 | without further backtracking. */ | |
f95d599c GM |
136 | #define RE_NO_POSIX_BACKTRACKING (RE_NO_EMPTY_RANGES << 1) |
137 | ||
dd52d970 SM |
138 | /* If this bit is set, then (?:...) is treated as a shy group. */ |
139 | #define RE_SHY_GROUPS (RE_NO_POSIX_BACKTRACKING << 1) | |
140 | ||
f95d599c GM |
141 | /* If this bit is set, then an unmatched ) is ordinary. |
142 | If not set, then an unmatched ) is invalid. */ | |
dd52d970 | 143 | #define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_SHY_GROUPS << 1) |
5cc05562 | 144 | |
b1fe2cfc KB |
145 | /* This global variable defines the particular regexp syntax to use (for |
146 | some interfaces). When a regexp is compiled, the syntax used is | |
147 | stored in the pattern buffer, so changing this does not affect | |
148 | already-compiled regexps. */ | |
149 | extern reg_syntax_t re_syntax_options; | |
766ff627 RS |
150 | |
151 | #ifdef emacs | |
152 | /* In Emacs, this is the string or buffer in which we | |
153 | are matching. It is used for looking up syntax properties. */ | |
154 | extern Lisp_Object re_match_object; | |
155 | #endif | |
156 | ||
b1fe2cfc KB |
157 | \f |
158 | /* Define combinations of the above bits for the standard possibilities. | |
159 | (The [[[ comments delimit what gets put into the Texinfo file, so | |
fb4a568d | 160 | don't delete them!) */ |
b1fe2cfc | 161 | /* [[[begin syntaxes]]] */ |
dd52d970 | 162 | #define RE_SYNTAX_EMACS (RE_CHAR_CLASSES | RE_INTERVALS | RE_SHY_GROUPS) |
b1fe2cfc KB |
163 | |
164 | #define RE_SYNTAX_AWK \ | |
165 | (RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DOT_NOT_NULL \ | |
166 | | RE_NO_BK_PARENS | RE_NO_BK_REFS \ | |
1a4ea60b | 167 | | RE_NO_BK_VBAR | RE_NO_EMPTY_RANGES \ |
f95d599c | 168 | | RE_UNMATCHED_RIGHT_PAREN_ORD | RE_ALL_GREEDY) |
b1fe2cfc KB |
169 | |
170 | #define RE_SYNTAX_POSIX_AWK \ | |
171 | (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS) | |
172 | ||
173 | #define RE_SYNTAX_GREP \ | |
174 | (RE_BK_PLUS_QM | RE_CHAR_CLASSES \ | |
175 | | RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS \ | |
f95d599c | 176 | | RE_NEWLINE_ALT | RE_ALL_GREEDY) |
b1fe2cfc KB |
177 | |
178 | #define RE_SYNTAX_EGREP \ | |
179 | (RE_CHAR_CLASSES | RE_CONTEXT_INDEP_ANCHORS \ | |
180 | | RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE \ | |
181 | | RE_NEWLINE_ALT | RE_NO_BK_PARENS \ | |
f95d599c | 182 | | RE_NO_BK_VBAR | RE_ALL_GREEDY) |
b1fe2cfc KB |
183 | |
184 | #define RE_SYNTAX_POSIX_EGREP \ | |
185 | (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES) | |
186 | ||
9114e279 KB |
187 | /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff. */ |
188 | #define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC | |
189 | ||
b1fe2cfc KB |
190 | #define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC |
191 | ||
192 | /* Syntax bits common to both basic and extended POSIX regex syntax. */ | |
193 | #define _RE_SYNTAX_POSIX_COMMON \ | |
194 | (RE_CHAR_CLASSES | RE_DOT_NEWLINE | RE_DOT_NOT_NULL \ | |
f95d599c | 195 | | RE_INTERVALS | RE_NO_EMPTY_RANGES | RE_ALL_GREEDY) |
b1fe2cfc KB |
196 | |
197 | #define RE_SYNTAX_POSIX_BASIC \ | |
198 | (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM) | |
199 | ||
200 | /* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes | |
201 | RE_LIMITED_OPS, i.e., \? \+ \| are not recognized. Actually, this | |
202 | isn't minimal, since other operators, such as \`, aren't disabled. */ | |
203 | #define RE_SYNTAX_POSIX_MINIMAL_BASIC \ | |
204 | (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS) | |
205 | ||
206 | #define RE_SYNTAX_POSIX_EXTENDED \ | |
207 | (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \ | |
208 | | RE_CONTEXT_INDEP_OPS | RE_NO_BK_BRACES \ | |
209 | | RE_NO_BK_PARENS | RE_NO_BK_VBAR \ | |
210 | | RE_UNMATCHED_RIGHT_PAREN_ORD) | |
211 | ||
212 | /* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INVALID_OPS | |
213 | replaces RE_CONTEXT_INDEP_OPS and RE_NO_BK_REFS is added. */ | |
214 | #define RE_SYNTAX_POSIX_MINIMAL_EXTENDED \ | |
215 | (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \ | |
216 | | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES \ | |
217 | | RE_NO_BK_PARENS | RE_NO_BK_REFS \ | |
218 | | RE_NO_BK_VBAR | RE_UNMATCHED_RIGHT_PAREN_ORD) | |
219 | /* [[[end syntaxes]]] */ | |
220 | \f | |
221 | /* Maximum number of duplicates an interval can allow. Some systems | |
222 | (erroneously) define this in other header files, but we want our | |
223 | value, so remove any previous define. */ | |
224 | #ifdef RE_DUP_MAX | |
225 | #undef RE_DUP_MAX | |
226 | #endif | |
227 | #define RE_DUP_MAX ((1 << 15) - 1) | |
228 | ||
229 | ||
230 | /* POSIX `cflags' bits (i.e., information for `regcomp'). */ | |
231 | ||
232 | /* If this bit is set, then use extended regular expression syntax. | |
233 | If not set, then use basic regular expression syntax. */ | |
234 | #define REG_EXTENDED 1 | |
235 | ||
236 | /* If this bit is set, then ignore case when matching. | |
237 | If not set, then case is significant. */ | |
238 | #define REG_ICASE (REG_EXTENDED << 1) | |
239 | ||
240 | /* If this bit is set, then anchors do not match at newline | |
241 | characters in the string. | |
242 | If not set, then anchors do match at newlines. */ | |
243 | #define REG_NEWLINE (REG_ICASE << 1) | |
244 | ||
245 | /* If this bit is set, then report only success or fail in regexec. | |
246 | If not set, then returns differ between not matching and errors. */ | |
247 | #define REG_NOSUB (REG_NEWLINE << 1) | |
248 | ||
249 | ||
250 | /* POSIX `eflags' bits (i.e., information for regexec). */ | |
251 | ||
252 | /* If this bit is set, then the beginning-of-line operator doesn't match | |
253 | the beginning of the string (presumably because it's not the | |
254 | beginning of a line). | |
255 | If not set, then the beginning-of-line operator does match the | |
256 | beginning of the string. */ | |
257 | #define REG_NOTBOL 1 | |
258 | ||
259 | /* Like REG_NOTBOL, except for the end-of-line. */ | |
260 | #define REG_NOTEOL (1 << 1) | |
261 | ||
262 | ||
263 | /* If any error codes are removed, changed, or added, update the | |
264 | `re_error_msg' table in regex.c. */ | |
265 | typedef enum | |
266 | { | |
267 | REG_NOERROR = 0, /* Success. */ | |
268 | REG_NOMATCH, /* Didn't find a match (for regexec). */ | |
269 | ||
270 | /* POSIX regcomp return error codes. (In the order listed in the | |
271 | standard.) */ | |
272 | REG_BADPAT, /* Invalid pattern. */ | |
273 | REG_ECOLLATE, /* Not implemented. */ | |
274 | REG_ECTYPE, /* Invalid character class name. */ | |
275 | REG_EESCAPE, /* Trailing backslash. */ | |
276 | REG_ESUBREG, /* Invalid back reference. */ | |
277 | REG_EBRACK, /* Unmatched left bracket. */ | |
278 | REG_EPAREN, /* Parenthesis imbalance. */ | |
279 | REG_EBRACE, /* Unmatched \{. */ | |
280 | REG_BADBR, /* Invalid contents of \{\}. */ | |
281 | REG_ERANGE, /* Invalid range end. */ | |
282 | REG_ESPACE, /* Ran out of memory. */ | |
283 | REG_BADRPT, /* No preceding re for repetition op. */ | |
284 | ||
285 | /* Error codes we've added. */ | |
286 | REG_EEND, /* Premature end. */ | |
287 | REG_ESIZE, /* Compiled pattern bigger than 2^16 bytes. */ | |
288 | REG_ERPAREN /* Unmatched ) or \); not returned from regcomp. */ | |
289 | } reg_errcode_t; | |
290 | \f | |
291 | /* This data structure represents a compiled pattern. Before calling | |
292 | the pattern compiler, the fields `buffer', `allocated', `fastmap', | |
293 | `translate', and `no_sub' can be set. After the pattern has been | |
294 | compiled, the `re_nsub' field is available. All other fields are | |
295 | private to the regex routines. */ | |
296 | ||
fc4e96c8 | 297 | #ifndef RE_TRANSLATE_TYPE |
6fffb26e RS |
298 | #define RE_TRANSLATE_TYPE char * |
299 | #endif | |
300 | ||
b1fe2cfc KB |
301 | struct re_pattern_buffer |
302 | { | |
303 | /* [[[begin pattern_buffer]]] */ | |
304 | /* Space that holds the compiled pattern. It is declared as | |
305 | `unsigned char *' because its elements are | |
306 | sometimes used as array indexes. */ | |
307 | unsigned char *buffer; | |
308 | ||
309 | /* Number of bytes to which `buffer' points. */ | |
310 | unsigned long allocated; | |
311 | ||
312 | /* Number of bytes actually used in `buffer'. */ | |
313 | unsigned long used; | |
314 | ||
315 | /* Syntax setting with which the pattern was compiled. */ | |
316 | reg_syntax_t syntax; | |
317 | ||
318 | /* Pointer to a fastmap, if any, otherwise zero. re_search uses | |
319 | the fastmap, if there is one, to skip over impossible | |
320 | starting points for matches. */ | |
321 | char *fastmap; | |
322 | ||
323 | /* Either a translate table to apply to all characters before | |
324 | comparing them, or zero for no translation. The translation | |
325 | is applied to a pattern when it is compiled and to a string | |
326 | when it is matched. */ | |
6fffb26e | 327 | RE_TRANSLATE_TYPE translate; |
b1fe2cfc KB |
328 | |
329 | /* Number of subexpressions found by the compiler. */ | |
330 | size_t re_nsub; | |
331 | ||
332 | /* Zero if this pattern cannot match the empty string, one else. | |
333 | Well, in truth it's used only in `re_search_2', to see | |
334 | whether or not we should use the fastmap, so we don't set | |
dd52d970 | 335 | this absolutely perfectly; see `re_compile_fastmap'. */ |
b1fe2cfc KB |
336 | unsigned can_be_null : 1; |
337 | ||
338 | /* If REGS_UNALLOCATED, allocate space in the `regs' structure | |
339 | for `max (RE_NREGS, re_nsub + 1)' groups. | |
340 | If REGS_REALLOCATE, reallocate space if necessary. | |
341 | If REGS_FIXED, use what's there. */ | |
342 | #define REGS_UNALLOCATED 0 | |
343 | #define REGS_REALLOCATE 1 | |
344 | #define REGS_FIXED 2 | |
345 | unsigned regs_allocated : 2; | |
346 | ||
9114e279 KB |
347 | /* Set to zero when `regex_compile' compiles a pattern; set to one |
348 | by `re_compile_fastmap' if it updates the fastmap. */ | |
b1fe2cfc KB |
349 | unsigned fastmap_accurate : 1; |
350 | ||
9114e279 KB |
351 | /* If set, `re_match_2' does not return information about |
352 | subexpressions. */ | |
b1fe2cfc KB |
353 | unsigned no_sub : 1; |
354 | ||
355 | /* If set, a beginning-of-line anchor doesn't match at the | |
356 | beginning of the string. */ | |
357 | unsigned not_bol : 1; | |
358 | ||
359 | /* Similarly for an end-of-line anchor. */ | |
360 | unsigned not_eol : 1; | |
361 | ||
362 | /* If true, an anchor at a newline matches. */ | |
363 | unsigned newline_anchor : 1; | |
364 | ||
2d1675e4 | 365 | #ifdef emacs |
766ff627 RS |
366 | /* If true, multi-byte form in the `buffer' should be recognized as a |
367 | multibyte character. */ | |
368 | unsigned multibyte : 1; | |
2d1675e4 | 369 | #endif |
766ff627 | 370 | |
b1fe2cfc KB |
371 | /* [[[end pattern_buffer]]] */ |
372 | }; | |
373 | ||
374 | typedef struct re_pattern_buffer regex_t; | |
b1fe2cfc KB |
375 | \f |
376 | /* Type for byte offsets within the string. POSIX mandates this. */ | |
377 | typedef int regoff_t; | |
378 | ||
379 | ||
380 | /* This is the structure we store register match data in. See | |
381 | regex.texinfo for a full description of what registers match. */ | |
382 | struct re_registers | |
383 | { | |
384 | unsigned num_regs; | |
385 | regoff_t *start; | |
386 | regoff_t *end; | |
387 | }; | |
388 | ||
389 | ||
390 | /* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer, | |
391 | `re_match_2' returns information about at least this many registers | |
392 | the first time a `regs' structure is passed. */ | |
393 | #ifndef RE_NREGS | |
394 | #define RE_NREGS 30 | |
395 | #endif | |
396 | ||
397 | ||
398 | /* POSIX specification for registers. Aside from the different names than | |
399 | `re_registers', POSIX uses an array of structures, instead of a | |
400 | structure of arrays. */ | |
401 | typedef struct | |
402 | { | |
403 | regoff_t rm_so; /* Byte offset from string's start to substring's start. */ | |
404 | regoff_t rm_eo; /* Byte offset from string's start to substring's end. */ | |
405 | } regmatch_t; | |
406 | \f | |
407 | /* Declarations for routines. */ | |
408 | ||
409 | /* To avoid duplicating every routine declaration -- once with a | |
410 | prototype (if we are ANSI), and once without (if we aren't) -- we | |
411 | use the following macro to declare argument types. This | |
412 | unfortunately clutters up the declarations a bit, but I think it's | |
65565c68 | 413 | worth it. */ |
b1fe2cfc | 414 | |
2a90cd71 | 415 | #if defined __STDC__ || defined PROTOTYPES |
0783dc9a | 416 | |
b1fe2cfc | 417 | #define _RE_ARGS(args) args |
0783dc9a | 418 | |
2a90cd71 | 419 | #else /* not __STDC__ || PROTOTYPES */ |
0783dc9a | 420 | |
b1fe2cfc | 421 | #define _RE_ARGS(args) () |
0783dc9a | 422 | |
2a90cd71 | 423 | #endif /* not __STDC__ || PROTOTYPES */ |
b1fe2cfc KB |
424 | |
425 | /* Sets the current default syntax to SYNTAX, and return the old syntax. | |
426 | You can also simply assign to the `re_syntax_options' variable. */ | |
427 | extern reg_syntax_t re_set_syntax _RE_ARGS ((reg_syntax_t syntax)); | |
428 | ||
429 | /* Compile the regular expression PATTERN, with length LENGTH | |
430 | and syntax given by the global `re_syntax_options', into the buffer | |
431 | BUFFER. Return NULL if successful, and an error string if not. */ | |
432 | extern const char *re_compile_pattern | |
433 | _RE_ARGS ((const char *pattern, int length, | |
434 | struct re_pattern_buffer *buffer)); | |
435 | ||
436 | ||
437 | /* Compile a fastmap for the compiled pattern in BUFFER; used to | |
438 | accelerate searches. Return 0 if successful and -2 if was an | |
439 | internal error. */ | |
440 | extern int re_compile_fastmap _RE_ARGS ((struct re_pattern_buffer *buffer)); | |
441 | ||
442 | ||
443 | /* Search in the string STRING (with length LENGTH) for the pattern | |
444 | compiled into BUFFER. Start searching at position START, for RANGE | |
445 | characters. Return the starting position of the match, -1 for no | |
446 | match, or -2 for an internal error. Also return register | |
447 | information in REGS (if REGS and BUFFER->no_sub are nonzero). */ | |
448 | extern int re_search | |
449 | _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string, | |
450 | int length, int start, int range, struct re_registers *regs)); | |
451 | ||
452 | ||
453 | /* Like `re_search', but search in the concatenation of STRING1 and | |
454 | STRING2. Also, stop searching at index START + STOP. */ | |
455 | extern int re_search_2 | |
456 | _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1, | |
457 | int length1, const char *string2, int length2, | |
458 | int start, int range, struct re_registers *regs, int stop)); | |
459 | ||
460 | ||
461 | /* Like `re_search', but return how many characters in STRING the regexp | |
462 | in BUFFER matched, starting at position START. */ | |
463 | extern int re_match | |
464 | _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string, | |
465 | int length, int start, struct re_registers *regs)); | |
466 | ||
467 | ||
468 | /* Relates to `re_match' as `re_search_2' relates to `re_search'. */ | |
469 | extern int re_match_2 | |
470 | _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1, | |
471 | int length1, const char *string2, int length2, | |
472 | int start, struct re_registers *regs, int stop)); | |
473 | ||
474 | ||
475 | /* Set REGS to hold NUM_REGS registers, storing them in STARTS and | |
476 | ENDS. Subsequent matches using BUFFER and REGS will use this memory | |
477 | for recording register information. STARTS and ENDS must be | |
478 | allocated with malloc, and must each be at least `NUM_REGS * sizeof | |
479 | (regoff_t)' bytes long. | |
480 | ||
481 | If NUM_REGS == 0, then subsequent matches should allocate their own | |
482 | register data. | |
483 | ||
484 | Unless this function is called, the first search or match using | |
485 | PATTERN_BUFFER will allocate its own register data, without | |
486 | freeing the old data. */ | |
487 | extern void re_set_registers | |
488 | _RE_ARGS ((struct re_pattern_buffer *buffer, struct re_registers *regs, | |
489 | unsigned num_regs, regoff_t *starts, regoff_t *ends)); | |
490 | ||
273c0c50 | 491 | #ifdef _REGEX_RE_COMP |
b1fe2cfc KB |
492 | /* 4.2 bsd compatibility. */ |
493 | extern char *re_comp _RE_ARGS ((const char *)); | |
494 | extern int re_exec _RE_ARGS ((const char *)); | |
273c0c50 | 495 | #endif |
b1fe2cfc KB |
496 | |
497 | /* POSIX compatibility. */ | |
498 | extern int regcomp _RE_ARGS ((regex_t *preg, const char *pattern, int cflags)); | |
499 | extern int regexec | |
500 | _RE_ARGS ((const regex_t *preg, const char *string, size_t nmatch, | |
501 | regmatch_t pmatch[], int eflags)); | |
502 | extern size_t regerror | |
503 | _RE_ARGS ((int errcode, const regex_t *preg, char *errbuf, | |
504 | size_t errbuf_size)); | |
505 | extern void regfree _RE_ARGS ((regex_t *preg)); | |
506 | ||
507 | #endif /* not __REGEXP_LIBRARY_H__ */ | |
508 | \f | |
509 | /* | |
510 | Local variables: | |
511 | make-backup-files: t | |
512 | version-control: t | |
513 | trim-versions-without-asking: nil | |
514 | End: | |
515 | */ |