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3b0bdc72 | 1 | /* Extended regular expression matching and search library. |
54e1cabc | 2 | Copyright (C) 2002, 2003 Free Software Foundation, Inc. |
3b0bdc72 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library 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 GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
20 | ||
a9388965 | 21 | static reg_errcode_t match_ctx_init (re_match_context_t *cache, int eflags, |
612546c6 | 22 | re_string_t *input, int n); |
6291ee3c | 23 | static void match_ctx_clean (re_match_context_t *mctx); |
3b0bdc72 | 24 | static void match_ctx_free (re_match_context_t *cache); |
6291ee3c | 25 | static void match_ctx_free_subtops (re_match_context_t *mctx); |
a9388965 | 26 | static reg_errcode_t match_ctx_add_entry (re_match_context_t *cache, int node, |
15a7d175 | 27 | int str_idx, int from, int to); |
6291ee3c | 28 | static int search_cur_bkref_entry (re_match_context_t *mctx, int str_idx); |
0742e48e | 29 | static void match_ctx_clear_flag (re_match_context_t *mctx); |
6291ee3c UD |
30 | static reg_errcode_t match_ctx_add_subtop (re_match_context_t *mctx, int node, |
31 | int str_idx); | |
32 | static re_sub_match_last_t * match_ctx_add_sublast (re_sub_match_top_t *subtop, | |
33 | int node, int str_idx); | |
0742e48e | 34 | static void sift_ctx_init (re_sift_context_t *sctx, re_dfastate_t **sifted_sts, |
15a7d175 UD |
35 | re_dfastate_t **limited_sts, int last_node, |
36 | int last_str_idx, int check_subexp); | |
a9388965 | 37 | static reg_errcode_t re_search_internal (const regex_t *preg, |
15a7d175 UD |
38 | const char *string, int length, |
39 | int start, int range, int stop, | |
40 | size_t nmatch, regmatch_t pmatch[], | |
41 | int eflags); | |
ac3d553b | 42 | static int re_search_2_stub (struct re_pattern_buffer *bufp, |
15a7d175 UD |
43 | const char *string1, int length1, |
44 | const char *string2, int length2, | |
45 | int start, int range, struct re_registers *regs, | |
46 | int stop, int ret_len); | |
ac3d553b | 47 | static int re_search_stub (struct re_pattern_buffer *bufp, |
15a7d175 UD |
48 | const char *string, int length, int start, |
49 | int range, int stop, struct re_registers *regs, | |
50 | int ret_len); | |
ac3d553b | 51 | static unsigned re_copy_regs (struct re_registers *regs, regmatch_t *pmatch, |
15a7d175 | 52 | int nregs, int regs_allocated); |
a9388965 | 53 | static inline re_dfastate_t *acquire_init_state_context (reg_errcode_t *err, |
15a7d175 UD |
54 | const regex_t *preg, |
55 | const re_match_context_t *mctx, | |
56 | int idx); | |
6291ee3c UD |
57 | static reg_errcode_t prune_impossible_nodes (const regex_t *preg, |
58 | re_match_context_t *mctx); | |
612546c6 | 59 | static int check_matching (const regex_t *preg, re_match_context_t *mctx, |
15a7d175 | 60 | int fl_search, int fl_longest_match); |
3b0bdc72 | 61 | static int check_halt_node_context (const re_dfa_t *dfa, int node, |
15a7d175 | 62 | unsigned int context); |
3b0bdc72 | 63 | static int check_halt_state_context (const regex_t *preg, |
15a7d175 UD |
64 | const re_dfastate_t *state, |
65 | const re_match_context_t *mctx, int idx); | |
81c64d40 | 66 | static void update_regs (re_dfa_t *dfa, regmatch_t *pmatch, int cur_node, |
15a7d175 | 67 | int cur_idx, int nmatch); |
a3022b82 | 68 | static int proceed_next_node (const regex_t *preg, int nregs, regmatch_t *regs, |
15a7d175 UD |
69 | const re_match_context_t *mctx, |
70 | int *pidx, int node, re_node_set *eps_via_nodes, | |
71 | struct re_fail_stack_t *fs); | |
1b2c2628 | 72 | static reg_errcode_t push_fail_stack (struct re_fail_stack_t *fs, |
15a7d175 UD |
73 | int str_idx, int *dests, int nregs, |
74 | regmatch_t *regs, | |
75 | re_node_set *eps_via_nodes); | |
a3022b82 | 76 | static int pop_fail_stack (struct re_fail_stack_t *fs, int *pidx, int nregs, |
15a7d175 | 77 | regmatch_t *regs, re_node_set *eps_via_nodes); |
612546c6 | 78 | static reg_errcode_t set_regs (const regex_t *preg, |
15a7d175 UD |
79 | const re_match_context_t *mctx, |
80 | size_t nmatch, regmatch_t *pmatch, | |
81 | int fl_backtrack); | |
485d775d UD |
82 | static reg_errcode_t free_fail_stack_return (struct re_fail_stack_t *fs); |
83 | ||
434d3784 | 84 | #ifdef RE_ENABLE_I18N |
612546c6 | 85 | static int sift_states_iter_mb (const regex_t *preg, |
15a7d175 UD |
86 | const re_match_context_t *mctx, |
87 | re_sift_context_t *sctx, | |
88 | int node_idx, int str_idx, int max_str_idx); | |
434d3784 | 89 | #endif /* RE_ENABLE_I18N */ |
a9388965 | 90 | static reg_errcode_t sift_states_backward (const regex_t *preg, |
15a7d175 UD |
91 | re_match_context_t *mctx, |
92 | re_sift_context_t *sctx); | |
0742e48e | 93 | static reg_errcode_t update_cur_sifted_state (const regex_t *preg, |
15a7d175 UD |
94 | re_match_context_t *mctx, |
95 | re_sift_context_t *sctx, | |
96 | int str_idx, | |
97 | re_node_set *dest_nodes); | |
0742e48e | 98 | static reg_errcode_t add_epsilon_src_nodes (re_dfa_t *dfa, |
15a7d175 UD |
99 | re_node_set *dest_nodes, |
100 | const re_node_set *candidates); | |
0742e48e | 101 | static reg_errcode_t sub_epsilon_src_nodes (re_dfa_t *dfa, int node, |
15a7d175 UD |
102 | re_node_set *dest_nodes, |
103 | const re_node_set *and_nodes); | |
a3022b82 | 104 | static int check_dst_limits (re_dfa_t *dfa, re_node_set *limits, |
15a7d175 UD |
105 | re_match_context_t *mctx, int dst_node, |
106 | int dst_idx, int src_node, int src_idx); | |
a3022b82 | 107 | static int check_dst_limits_calc_pos (re_dfa_t *dfa, re_match_context_t *mctx, |
15a7d175 UD |
108 | int limit, re_node_set *eclosures, |
109 | int subexp_idx, int node, int str_idx); | |
0742e48e | 110 | static reg_errcode_t check_subexp_limits (re_dfa_t *dfa, |
15a7d175 UD |
111 | re_node_set *dest_nodes, |
112 | const re_node_set *candidates, | |
113 | re_node_set *limits, | |
114 | struct re_backref_cache_entry *bkref_ents, | |
115 | int str_idx); | |
0742e48e | 116 | static reg_errcode_t sift_states_bkref (const regex_t *preg, |
15a7d175 UD |
117 | re_match_context_t *mctx, |
118 | re_sift_context_t *sctx, | |
119 | int str_idx, re_node_set *dest_nodes); | |
612546c6 | 120 | static reg_errcode_t clean_state_log_if_need (re_match_context_t *mctx, |
15a7d175 | 121 | int next_state_log_idx); |
0742e48e | 122 | static reg_errcode_t merge_state_array (re_dfa_t *dfa, re_dfastate_t **dst, |
15a7d175 | 123 | re_dfastate_t **src, int num); |
a9388965 | 124 | static re_dfastate_t *transit_state (reg_errcode_t *err, const regex_t *preg, |
15a7d175 UD |
125 | re_match_context_t *mctx, |
126 | re_dfastate_t *state, int fl_search); | |
6291ee3c UD |
127 | static reg_errcode_t check_subexp_matching_top (re_dfa_t *dfa, |
128 | re_match_context_t *mctx, | |
129 | re_node_set *cur_nodes, | |
130 | int str_idx); | |
a9388965 | 131 | static re_dfastate_t *transit_state_sb (reg_errcode_t *err, const regex_t *preg, |
15a7d175 UD |
132 | re_dfastate_t *pstate, |
133 | int fl_search, | |
134 | re_match_context_t *mctx); | |
434d3784 | 135 | #ifdef RE_ENABLE_I18N |
a9388965 | 136 | static reg_errcode_t transit_state_mb (const regex_t *preg, |
15a7d175 UD |
137 | re_dfastate_t *pstate, |
138 | re_match_context_t *mctx); | |
434d3784 | 139 | #endif /* RE_ENABLE_I18N */ |
a9388965 | 140 | static reg_errcode_t transit_state_bkref (const regex_t *preg, |
6291ee3c | 141 | re_node_set *nodes, |
15a7d175 | 142 | re_match_context_t *mctx); |
6291ee3c UD |
143 | static reg_errcode_t get_subexp (const regex_t *preg, re_match_context_t *mctx, |
144 | int bkref_node, int bkref_str_idx); | |
145 | static reg_errcode_t get_subexp_sub (const regex_t *preg, | |
146 | re_match_context_t *mctx, | |
147 | re_sub_match_top_t *sub_top, | |
148 | re_sub_match_last_t *sub_last, | |
149 | int bkref_node, int bkref_str); | |
150 | static int find_subexp_node (re_dfa_t *dfa, re_node_set *nodes, | |
151 | int subexp_idx, int fl_open); | |
54e1cabc | 152 | static reg_errcode_t check_arrival (const regex_t *preg, |
6291ee3c UD |
153 | re_match_context_t *mctx, |
154 | state_array_t *path, int top_node, | |
155 | int top_str, int last_node, int last_str, | |
156 | int fl_open); | |
157 | static reg_errcode_t check_arrival_add_next_nodes (const regex_t *preg, | |
158 | re_dfa_t *dfa, | |
159 | re_match_context_t *mctx, | |
160 | int str_idx, | |
161 | re_node_set *cur_nodes, | |
162 | re_node_set *next_nodes); | |
163 | static reg_errcode_t check_arrival_expand_ecl (re_dfa_t *dfa, | |
164 | re_node_set *cur_nodes, | |
165 | int ex_subexp, int fl_open); | |
166 | static reg_errcode_t check_arrival_expand_ecl_sub (re_dfa_t *dfa, | |
167 | re_node_set *dst_nodes, | |
168 | int target, int ex_subexp, | |
169 | int fl_open); | |
170 | static reg_errcode_t expand_bkref_cache (const regex_t *preg, | |
171 | re_match_context_t *mctx, | |
172 | re_node_set *cur_nodes, int cur_str, | |
173 | int last_str, int subexp_num, | |
174 | int fl_open); | |
3b0bdc72 | 175 | static re_dfastate_t **build_trtable (const regex_t *dfa, |
15a7d175 UD |
176 | const re_dfastate_t *state, |
177 | int fl_search); | |
434d3784 | 178 | #ifdef RE_ENABLE_I18N |
3b0bdc72 | 179 | static int check_node_accept_bytes (const regex_t *preg, int node_idx, |
15a7d175 | 180 | const re_string_t *input, int idx); |
434d3784 | 181 | # ifdef _LIBC |
c202c2c5 | 182 | static unsigned int find_collation_sequence_value (const unsigned char *mbs, |
15a7d175 | 183 | size_t name_len); |
434d3784 UD |
184 | # endif /* _LIBC */ |
185 | #endif /* RE_ENABLE_I18N */ | |
3b0bdc72 | 186 | static int group_nodes_into_DFAstates (const regex_t *dfa, |
15a7d175 UD |
187 | const re_dfastate_t *state, |
188 | re_node_set *states_node, | |
189 | bitset *states_ch); | |
3b0bdc72 | 190 | static int check_node_accept (const regex_t *preg, const re_token_t *node, |
15a7d175 | 191 | const re_match_context_t *mctx, int idx); |
612546c6 | 192 | static reg_errcode_t extend_buffers (re_match_context_t *mctx); |
3b0bdc72 UD |
193 | \f |
194 | /* Entry point for POSIX code. */ | |
195 | ||
196 | /* regexec searches for a given pattern, specified by PREG, in the | |
197 | string STRING. | |
198 | ||
199 | If NMATCH is zero or REG_NOSUB was set in the cflags argument to | |
200 | `regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at | |
201 | least NMATCH elements, and we set them to the offsets of the | |
202 | corresponding matched substrings. | |
203 | ||
204 | EFLAGS specifies `execution flags' which affect matching: if | |
205 | REG_NOTBOL is set, then ^ does not match at the beginning of the | |
206 | string; if REG_NOTEOL is set, then $ does not match at the end. | |
207 | ||
208 | We return 0 if we find a match and REG_NOMATCH if not. */ | |
209 | ||
210 | int | |
211 | regexec (preg, string, nmatch, pmatch, eflags) | |
92b27c74 UD |
212 | const regex_t *__restrict preg; |
213 | const char *__restrict string; | |
3b0bdc72 UD |
214 | size_t nmatch; |
215 | regmatch_t pmatch[]; | |
216 | int eflags; | |
217 | { | |
a9388965 | 218 | reg_errcode_t err; |
3b0bdc72 UD |
219 | int length = strlen (string); |
220 | if (preg->no_sub) | |
ac3d553b | 221 | err = re_search_internal (preg, string, length, 0, length, length, 0, |
15a7d175 | 222 | NULL, eflags); |
3b0bdc72 | 223 | else |
ac3d553b | 224 | err = re_search_internal (preg, string, length, 0, length, length, nmatch, |
15a7d175 | 225 | pmatch, eflags); |
a9388965 | 226 | return err != REG_NOERROR; |
3b0bdc72 UD |
227 | } |
228 | #ifdef _LIBC | |
229 | weak_alias (__regexec, regexec) | |
230 | #endif | |
231 | ||
232 | /* Entry points for GNU code. */ | |
233 | ||
ac3d553b UD |
234 | /* re_match, re_search, re_match_2, re_search_2 |
235 | ||
236 | The former two functions operate on STRING with length LENGTH, | |
237 | while the later two operate on concatenation of STRING1 and STRING2 | |
238 | with lengths LENGTH1 and LENGTH2, respectively. | |
239 | ||
240 | re_match() matches the compiled pattern in BUFP against the string, | |
241 | starting at index START. | |
242 | ||
243 | re_search() first tries matching at index START, then it tries to match | |
244 | starting from index START + 1, and so on. The last start position tried | |
245 | is START + RANGE. (Thus RANGE = 0 forces re_search to operate the same | |
246 | way as re_match().) | |
247 | ||
248 | The parameter STOP of re_{match,search}_2 specifies that no match exceeding | |
249 | the first STOP characters of the concatenation of the strings should be | |
250 | concerned. | |
251 | ||
252 | If REGS is not NULL, and BUFP->no_sub is not set, the offsets of the match | |
253 | and all groups is stroed in REGS. (For the "_2" variants, the offsets are | |
254 | computed relative to the concatenation, not relative to the individual | |
255 | strings.) | |
256 | ||
257 | On success, re_match* functions return the length of the match, re_search* | |
258 | return the position of the start of the match. Return value -1 means no | |
259 | match was found and -2 indicates an internal error. */ | |
3b0bdc72 UD |
260 | |
261 | int | |
ac3d553b UD |
262 | re_match (bufp, string, length, start, regs) |
263 | struct re_pattern_buffer *bufp; | |
3b0bdc72 UD |
264 | const char *string; |
265 | int length, start; | |
266 | struct re_registers *regs; | |
267 | { | |
ac3d553b | 268 | return re_search_stub (bufp, string, length, start, 0, length, regs, 1); |
3b0bdc72 UD |
269 | } |
270 | #ifdef _LIBC | |
271 | weak_alias (__re_match, re_match) | |
272 | #endif | |
273 | ||
ac3d553b UD |
274 | int |
275 | re_search (bufp, string, length, start, range, regs) | |
276 | struct re_pattern_buffer *bufp; | |
277 | const char *string; | |
278 | int length, start, range; | |
279 | struct re_registers *regs; | |
280 | { | |
281 | return re_search_stub (bufp, string, length, start, range, length, regs, 0); | |
282 | } | |
283 | #ifdef _LIBC | |
284 | weak_alias (__re_search, re_search) | |
285 | #endif | |
3b0bdc72 UD |
286 | |
287 | int | |
ac3d553b UD |
288 | re_match_2 (bufp, string1, length1, string2, length2, start, regs, stop) |
289 | struct re_pattern_buffer *bufp; | |
290 | const char *string1, *string2; | |
291 | int length1, length2, start, stop; | |
292 | struct re_registers *regs; | |
3b0bdc72 | 293 | { |
ac3d553b | 294 | return re_search_2_stub (bufp, string1, length1, string2, length2, |
15a7d175 | 295 | start, 0, regs, stop, 1); |
3b0bdc72 UD |
296 | } |
297 | #ifdef _LIBC | |
298 | weak_alias (__re_match_2, re_match_2) | |
299 | #endif | |
300 | ||
3b0bdc72 | 301 | int |
ac3d553b UD |
302 | re_search_2 (bufp, string1, length1, string2, length2, start, range, regs, stop) |
303 | struct re_pattern_buffer *bufp; | |
304 | const char *string1, *string2; | |
305 | int length1, length2, start, range, stop; | |
306 | struct re_registers *regs; | |
307 | { | |
308 | return re_search_2_stub (bufp, string1, length1, string2, length2, | |
15a7d175 | 309 | start, range, regs, stop, 0); |
ac3d553b UD |
310 | } |
311 | #ifdef _LIBC | |
312 | weak_alias (__re_search_2, re_search_2) | |
313 | #endif | |
314 | ||
315 | static int | |
316 | re_search_2_stub (bufp, string1, length1, string2, length2, start, range, regs, | |
15a7d175 | 317 | stop, ret_len) |
ac3d553b UD |
318 | struct re_pattern_buffer *bufp; |
319 | const char *string1, *string2; | |
320 | int length1, length2, start, range, stop, ret_len; | |
321 | struct re_registers *regs; | |
322 | { | |
323 | const char *str; | |
324 | int rval; | |
325 | int len = length1 + length2; | |
326 | int free_str = 0; | |
327 | ||
328 | if (BE (length1 < 0 || length2 < 0 || stop < 0, 0)) | |
329 | return -2; | |
330 | ||
331 | /* Concatenate the strings. */ | |
332 | if (length2 > 0) | |
333 | if (length1 > 0) | |
334 | { | |
15a7d175 UD |
335 | char *s = re_malloc (char, len); |
336 | ||
337 | if (BE (s == NULL, 0)) | |
338 | return -2; | |
339 | memcpy (s, string1, length1); | |
340 | memcpy (s + length1, string2, length2); | |
341 | str = s; | |
342 | free_str = 1; | |
ac3d553b UD |
343 | } |
344 | else | |
345 | str = string2; | |
346 | else | |
347 | str = string1; | |
348 | ||
349 | rval = re_search_stub (bufp, str, len, start, range, stop, regs, | |
15a7d175 | 350 | ret_len); |
ac3d553b | 351 | if (free_str) |
1b2c2628 | 352 | re_free ((char *) str); |
ac3d553b UD |
353 | return rval; |
354 | } | |
355 | ||
356 | /* The parameters have the same meaning as those of re_search. | |
357 | Additional parameters: | |
358 | If RET_LEN is nonzero the length of the match is returned (re_match style); | |
359 | otherwise the position of the match is returned. */ | |
360 | ||
361 | static int | |
362 | re_search_stub (bufp, string, length, start, range, stop, regs, ret_len) | |
363 | struct re_pattern_buffer *bufp; | |
364 | const char *string; | |
365 | int length, start, range, stop, ret_len; | |
366 | struct re_registers *regs; | |
3b0bdc72 | 367 | { |
a9388965 | 368 | reg_errcode_t result; |
3b0bdc72 | 369 | regmatch_t *pmatch; |
ac3d553b UD |
370 | int nregs, rval; |
371 | int eflags = 0; | |
372 | ||
373 | /* Check for out-of-range. */ | |
a877402c | 374 | if (BE (start < 0 || start > length, 0)) |
ac3d553b UD |
375 | return -1; |
376 | if (BE (start + range > length, 0)) | |
377 | range = length - start; | |
a877402c UD |
378 | else if (BE (start + range < 0, 0)) |
379 | range = -start; | |
3b0bdc72 UD |
380 | |
381 | eflags |= (bufp->not_bol) ? REG_NOTBOL : 0; | |
382 | eflags |= (bufp->not_eol) ? REG_NOTEOL : 0; | |
383 | ||
ac3d553b UD |
384 | /* Compile fastmap if we haven't yet. */ |
385 | if (range > 0 && bufp->fastmap != NULL && !bufp->fastmap_accurate) | |
386 | re_compile_fastmap (bufp); | |
387 | ||
388 | if (BE (bufp->no_sub, 0)) | |
389 | regs = NULL; | |
3b0bdc72 UD |
390 | |
391 | /* We need at least 1 register. */ | |
ac3d553b UD |
392 | if (regs == NULL) |
393 | nregs = 1; | |
394 | else if (BE (bufp->regs_allocated == REGS_FIXED && | |
15a7d175 | 395 | regs->num_regs < bufp->re_nsub + 1, 0)) |
ac3d553b UD |
396 | { |
397 | nregs = regs->num_regs; | |
398 | if (BE (nregs < 1, 0)) | |
15a7d175 UD |
399 | { |
400 | /* Nothing can be copied to regs. */ | |
401 | regs = NULL; | |
402 | nregs = 1; | |
403 | } | |
ac3d553b UD |
404 | } |
405 | else | |
406 | nregs = bufp->re_nsub + 1; | |
3b0bdc72 | 407 | pmatch = re_malloc (regmatch_t, nregs); |
bc15410e UD |
408 | if (BE (pmatch == NULL, 0)) |
409 | return -2; | |
3b0bdc72 | 410 | |
ac3d553b | 411 | result = re_search_internal (bufp, string, length, start, range, stop, |
15a7d175 | 412 | nregs, pmatch, eflags); |
3b0bdc72 | 413 | |
ac3d553b UD |
414 | rval = 0; |
415 | ||
416 | /* I hope we needn't fill ther regs with -1's when no match was found. */ | |
417 | if (result != REG_NOERROR) | |
418 | rval = -1; | |
419 | else if (regs != NULL) | |
3b0bdc72 | 420 | { |
ac3d553b UD |
421 | /* If caller wants register contents data back, copy them. */ |
422 | bufp->regs_allocated = re_copy_regs (regs, pmatch, nregs, | |
15a7d175 | 423 | bufp->regs_allocated); |
ac3d553b | 424 | if (BE (bufp->regs_allocated == REGS_UNALLOCATED, 0)) |
15a7d175 | 425 | rval = -2; |
3b0bdc72 UD |
426 | } |
427 | ||
ac3d553b | 428 | if (BE (rval == 0, 1)) |
3b0bdc72 | 429 | { |
ac3d553b | 430 | if (ret_len) |
15a7d175 UD |
431 | { |
432 | assert (pmatch[0].rm_so == start); | |
433 | rval = pmatch[0].rm_eo - start; | |
434 | } | |
ac3d553b | 435 | else |
15a7d175 | 436 | rval = pmatch[0].rm_so; |
3b0bdc72 | 437 | } |
3b0bdc72 UD |
438 | re_free (pmatch); |
439 | return rval; | |
440 | } | |
3b0bdc72 | 441 | |
ac3d553b UD |
442 | static unsigned |
443 | re_copy_regs (regs, pmatch, nregs, regs_allocated) | |
3b0bdc72 | 444 | struct re_registers *regs; |
ac3d553b UD |
445 | regmatch_t *pmatch; |
446 | int nregs, regs_allocated; | |
3b0bdc72 | 447 | { |
ac3d553b UD |
448 | int rval = REGS_REALLOCATE; |
449 | int i; | |
450 | int need_regs = nregs + 1; | |
451 | /* We need one extra element beyond `num_regs' for the `-1' marker GNU code | |
452 | uses. */ | |
453 | ||
454 | /* Have the register data arrays been allocated? */ | |
455 | if (regs_allocated == REGS_UNALLOCATED) | |
456 | { /* No. So allocate them with malloc. */ | |
457 | regs->start = re_malloc (regoff_t, need_regs); | |
458 | if (BE (regs->start == NULL, 0)) | |
15a7d175 | 459 | return REGS_UNALLOCATED; |
ac3d553b UD |
460 | regs->end = re_malloc (regoff_t, need_regs); |
461 | if (BE (regs->end == NULL, 0)) | |
15a7d175 UD |
462 | { |
463 | re_free (regs->start); | |
464 | return REGS_UNALLOCATED; | |
465 | } | |
ac3d553b UD |
466 | regs->num_regs = need_regs; |
467 | } | |
468 | else if (regs_allocated == REGS_REALLOCATE) | |
469 | { /* Yes. If we need more elements than were already | |
15a7d175 UD |
470 | allocated, reallocate them. If we need fewer, just |
471 | leave it alone. */ | |
ac3d553b | 472 | if (need_regs > regs->num_regs) |
15a7d175 UD |
473 | { |
474 | regs->start = re_realloc (regs->start, regoff_t, need_regs); | |
475 | if (BE (regs->start == NULL, 0)) | |
476 | { | |
477 | if (regs->end != NULL) | |
478 | re_free (regs->end); | |
479 | return REGS_UNALLOCATED; | |
480 | } | |
481 | regs->end = re_realloc (regs->end, regoff_t, need_regs); | |
482 | if (BE (regs->end == NULL, 0)) | |
483 | { | |
484 | re_free (regs->start); | |
485 | return REGS_UNALLOCATED; | |
486 | } | |
487 | regs->num_regs = need_regs; | |
488 | } | |
ac3d553b UD |
489 | } |
490 | else | |
491 | { | |
492 | assert (regs_allocated == REGS_FIXED); | |
493 | /* This function may not be called with REGS_FIXED and nregs too big. */ | |
494 | assert (regs->num_regs >= nregs); | |
495 | rval = REGS_FIXED; | |
496 | } | |
497 | ||
498 | /* Copy the regs. */ | |
499 | for (i = 0; i < nregs; ++i) | |
500 | { | |
501 | regs->start[i] = pmatch[i].rm_so; | |
502 | regs->end[i] = pmatch[i].rm_eo; | |
503 | } | |
504 | for ( ; i < regs->num_regs; ++i) | |
505 | regs->start[i] = regs->end[i] = -1; | |
506 | ||
507 | return rval; | |
3b0bdc72 | 508 | } |
3b0bdc72 UD |
509 | |
510 | /* Set REGS to hold NUM_REGS registers, storing them in STARTS and | |
511 | ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use | |
512 | this memory for recording register information. STARTS and ENDS | |
513 | must be allocated using the malloc library routine, and must each | |
514 | be at least NUM_REGS * sizeof (regoff_t) bytes long. | |
515 | ||
516 | If NUM_REGS == 0, then subsequent matches should allocate their own | |
517 | register data. | |
518 | ||
519 | Unless this function is called, the first search or match using | |
520 | PATTERN_BUFFER will allocate its own register data, without | |
521 | freeing the old data. */ | |
522 | ||
523 | void | |
524 | re_set_registers (bufp, regs, num_regs, starts, ends) | |
525 | struct re_pattern_buffer *bufp; | |
526 | struct re_registers *regs; | |
527 | unsigned num_regs; | |
528 | regoff_t *starts, *ends; | |
529 | { | |
530 | if (num_regs) | |
531 | { | |
532 | bufp->regs_allocated = REGS_REALLOCATE; | |
533 | regs->num_regs = num_regs; | |
534 | regs->start = starts; | |
535 | regs->end = ends; | |
536 | } | |
537 | else | |
538 | { | |
539 | bufp->regs_allocated = REGS_UNALLOCATED; | |
540 | regs->num_regs = 0; | |
541 | regs->start = regs->end = (regoff_t *) 0; | |
542 | } | |
543 | } | |
544 | #ifdef _LIBC | |
545 | weak_alias (__re_set_registers, re_set_registers) | |
546 | #endif | |
547 | \f | |
548 | /* Entry points compatible with 4.2 BSD regex library. We don't define | |
549 | them unless specifically requested. */ | |
550 | ||
551 | #if defined _REGEX_RE_COMP || defined _LIBC | |
552 | int | |
553 | # ifdef _LIBC | |
554 | weak_function | |
555 | # endif | |
556 | re_exec (s) | |
557 | const char *s; | |
558 | { | |
559 | return 0 == regexec (&re_comp_buf, s, 0, NULL, 0); | |
560 | } | |
561 | #endif /* _REGEX_RE_COMP */ | |
562 | \f | |
563 | static re_node_set empty_set; | |
564 | ||
565 | /* Internal entry point. */ | |
566 | ||
567 | /* Searches for a compiled pattern PREG in the string STRING, whose | |
568 | length is LENGTH. NMATCH, PMATCH, and EFLAGS have the same | |
569 | mingings with regexec. START, and RANGE have the same meanings | |
570 | with re_search. | |
a9388965 UD |
571 | Return REG_NOERROR if we find a match, and REG_NOMATCH if not, |
572 | otherwise return the error code. | |
3b0bdc72 UD |
573 | Note: We assume front end functions already check ranges. |
574 | (START + RANGE >= 0 && START + RANGE <= LENGTH) */ | |
575 | ||
a9388965 | 576 | static reg_errcode_t |
ac3d553b | 577 | re_search_internal (preg, string, length, start, range, stop, nmatch, pmatch, |
15a7d175 | 578 | eflags) |
3b0bdc72 UD |
579 | const regex_t *preg; |
580 | const char *string; | |
ac3d553b | 581 | int length, start, range, stop, eflags; |
3b0bdc72 UD |
582 | size_t nmatch; |
583 | regmatch_t pmatch[]; | |
584 | { | |
a9388965 | 585 | reg_errcode_t err; |
3b0bdc72 UD |
586 | re_dfa_t *dfa = (re_dfa_t *)preg->buffer; |
587 | re_string_t input; | |
612546c6 | 588 | int left_lim, right_lim, incr; |
3b0bdc72 | 589 | int fl_longest_match, match_first, match_last = -1; |
1b2c2628 | 590 | int fast_translate, sb; |
3b0bdc72 | 591 | re_match_context_t mctx; |
1b2c2628 UD |
592 | char *fastmap = ((preg->fastmap != NULL && preg->fastmap_accurate |
593 | && range && !preg->can_be_null) ? preg->fastmap : NULL); | |
3b0bdc72 UD |
594 | |
595 | /* Check if the DFA haven't been compiled. */ | |
bc15410e | 596 | if (BE (preg->used == 0 || dfa->init_state == NULL |
15a7d175 UD |
597 | || dfa->init_state_word == NULL || dfa->init_state_nl == NULL |
598 | || dfa->init_state_begbuf == NULL, 0)) | |
a9388965 | 599 | return REG_NOMATCH; |
3b0bdc72 UD |
600 | |
601 | re_node_set_init_empty (&empty_set); | |
1b2c2628 | 602 | memset (&mctx, '\0', sizeof (re_match_context_t)); |
3b0bdc72 UD |
603 | |
604 | /* We must check the longest matching, if nmatch > 0. */ | |
6291ee3c | 605 | fl_longest_match = (nmatch != 0 || dfa->nbackref); |
3b0bdc72 | 606 | |
612546c6 | 607 | err = re_string_allocate (&input, string, length, dfa->nodes_len + 1, |
15a7d175 | 608 | preg->translate, preg->syntax & RE_ICASE); |
612546c6 | 609 | if (BE (err != REG_NOERROR, 0)) |
1b2c2628 | 610 | goto free_return; |
ac3d553b | 611 | input.stop = stop; |
612546c6 UD |
612 | |
613 | err = match_ctx_init (&mctx, eflags, &input, dfa->nbackref * 2); | |
614 | if (BE (err != REG_NOERROR, 0)) | |
1b2c2628 | 615 | goto free_return; |
612546c6 | 616 | |
3b0bdc72 UD |
617 | /* We will log all the DFA states through which the dfa pass, |
618 | if nmatch > 1, or this dfa has "multibyte node", which is a | |
619 | back-reference or a node which can accept multibyte character or | |
620 | multi character collating element. */ | |
621 | if (nmatch > 1 || dfa->has_mb_node) | |
a9388965 | 622 | { |
612546c6 UD |
623 | mctx.state_log = re_malloc (re_dfastate_t *, dfa->nodes_len + 1); |
624 | if (BE (mctx.state_log == NULL, 0)) | |
15a7d175 UD |
625 | { |
626 | err = REG_ESPACE; | |
627 | goto free_return; | |
628 | } | |
a9388965 | 629 | } |
3b0bdc72 | 630 | else |
612546c6 | 631 | mctx.state_log = NULL; |
3b0bdc72 UD |
632 | |
633 | #ifdef DEBUG | |
634 | /* We assume front-end functions already check them. */ | |
635 | assert (start + range >= 0 && start + range <= length); | |
636 | #endif | |
637 | ||
612546c6 UD |
638 | match_first = start; |
639 | input.tip_context = ((eflags & REG_NOTBOL) ? CONTEXT_BEGBUF | |
15a7d175 | 640 | : CONTEXT_NEWLINE | CONTEXT_BEGBUF); |
612546c6 | 641 | |
3b0bdc72 | 642 | /* Check incrementally whether of not the input string match. */ |
612546c6 UD |
643 | incr = (range < 0) ? -1 : 1; |
644 | left_lim = (range < 0) ? start + range : start; | |
645 | right_lim = (range < 0) ? start : start + range; | |
1b2c2628 UD |
646 | sb = MB_CUR_MAX == 1; |
647 | fast_translate = sb || !(preg->syntax & RE_ICASE || preg->translate); | |
612546c6 UD |
648 | |
649 | for (;;) | |
3b0bdc72 | 650 | { |
612546c6 | 651 | /* At first get the current byte from input string. */ |
1b2c2628 UD |
652 | if (fastmap) |
653 | { | |
654 | if (BE (fast_translate, 1)) | |
655 | { | |
656 | unsigned RE_TRANSLATE_TYPE t | |
657 | = (unsigned RE_TRANSLATE_TYPE) preg->translate; | |
658 | if (BE (range >= 0, 1)) | |
659 | { | |
660 | if (BE (t != NULL, 0)) | |
661 | { | |
662 | while (BE (match_first < right_lim, 1) | |
663 | && !fastmap[t[(unsigned char) string[match_first]]]) | |
664 | ++match_first; | |
665 | } | |
666 | else | |
667 | { | |
668 | while (BE (match_first < right_lim, 1) | |
669 | && !fastmap[(unsigned char) string[match_first]]) | |
670 | ++match_first; | |
671 | } | |
672 | if (BE (match_first == right_lim, 0)) | |
673 | { | |
674 | int ch = match_first >= length | |
675 | ? 0 : (unsigned char) string[match_first]; | |
676 | if (!fastmap[t ? t[ch] : ch]) | |
677 | break; | |
678 | } | |
679 | } | |
680 | else | |
681 | { | |
682 | while (match_first >= left_lim) | |
683 | { | |
684 | int ch = match_first >= length | |
685 | ? 0 : (unsigned char) string[match_first]; | |
686 | if (fastmap[t ? t[ch] : ch]) | |
687 | break; | |
688 | --match_first; | |
689 | } | |
690 | if (match_first < left_lim) | |
691 | break; | |
692 | } | |
693 | } | |
694 | else | |
695 | { | |
696 | int ch; | |
697 | ||
698 | do | |
699 | { | |
700 | /* In this case, we can't determine easily the current byte, | |
701 | since it might be a component byte of a multibyte | |
702 | character. Then we use the constructed buffer | |
703 | instead. */ | |
704 | /* If MATCH_FIRST is out of the valid range, reconstruct the | |
705 | buffers. */ | |
706 | if (input.raw_mbs_idx + input.valid_len <= match_first | |
707 | || match_first < input.raw_mbs_idx) | |
708 | { | |
709 | err = re_string_reconstruct (&input, match_first, eflags, | |
710 | preg->newline_anchor); | |
711 | if (BE (err != REG_NOERROR, 0)) | |
712 | goto free_return; | |
713 | } | |
714 | /* If MATCH_FIRST is out of the buffer, leave it as '\0'. | |
715 | Note that MATCH_FIRST must not be smaller than 0. */ | |
716 | ch = ((match_first >= length) ? 0 | |
717 | : re_string_byte_at (&input, | |
718 | match_first - input.raw_mbs_idx)); | |
719 | if (fastmap[ch]) | |
720 | break; | |
721 | match_first += incr; | |
722 | } | |
723 | while (match_first >= left_lim && match_first <= right_lim); | |
724 | if (! fastmap[ch]) | |
725 | break; | |
726 | } | |
727 | } | |
612546c6 | 728 | |
1b2c2628 | 729 | /* Reconstruct the buffers so that the matcher can assume that |
15a7d175 | 730 | the matching starts from the begining of the buffer. */ |
1b2c2628 UD |
731 | err = re_string_reconstruct (&input, match_first, eflags, |
732 | preg->newline_anchor); | |
733 | if (BE (err != REG_NOERROR, 0)) | |
734 | goto free_return; | |
3b0bdc72 | 735 | #ifdef RE_ENABLE_I18N |
1b2c2628 | 736 | /* Eliminate it when it is a component of a multibyte character |
15a7d175 | 737 | and isn't the head of a multibyte character. */ |
1b2c2628 | 738 | if (sb || re_string_first_byte (&input, 0)) |
3b0bdc72 | 739 | #endif |
1b2c2628 UD |
740 | { |
741 | /* It seems to be appropriate one, then use the matcher. */ | |
742 | /* We assume that the matching starts from 0. */ | |
743 | mctx.state_log_top = mctx.nbkref_ents = mctx.max_mb_elem_len = 0; | |
744 | match_last = check_matching (preg, &mctx, 0, fl_longest_match); | |
745 | if (match_last != -1) | |
746 | { | |
747 | if (BE (match_last == -2, 0)) | |
748 | { | |
749 | err = REG_ESPACE; | |
750 | goto free_return; | |
751 | } | |
752 | else | |
6291ee3c UD |
753 | { |
754 | mctx.match_last = match_last; | |
755 | if ((!preg->no_sub && nmatch > 1) || dfa->nbackref) | |
756 | { | |
757 | re_dfastate_t *pstate = mctx.state_log[match_last]; | |
758 | mctx.last_node = check_halt_state_context (preg, pstate, | |
759 | &mctx, match_last); | |
760 | } | |
761 | if ((!preg->no_sub && nmatch > 1 && dfa->has_plural_match) | |
762 | || dfa->nbackref) | |
763 | { | |
764 | err = prune_impossible_nodes (preg, &mctx); | |
765 | if (err == REG_NOERROR) | |
766 | break; | |
767 | if (BE (err != REG_NOMATCH, 0)) | |
768 | goto free_return; | |
769 | } | |
770 | else | |
771 | break; /* We found a matching. */ | |
772 | } | |
1b2c2628 | 773 | } |
6291ee3c | 774 | match_ctx_clean (&mctx); |
1b2c2628 | 775 | } |
3b0bdc72 | 776 | /* Update counter. */ |
612546c6 UD |
777 | match_first += incr; |
778 | if (match_first < left_lim || right_lim < match_first) | |
15a7d175 | 779 | break; |
3b0bdc72 UD |
780 | } |
781 | ||
782 | /* Set pmatch[] if we need. */ | |
783 | if (match_last != -1 && nmatch > 0) | |
784 | { | |
785 | int reg_idx; | |
786 | ||
787 | /* Initialize registers. */ | |
788 | for (reg_idx = 0; reg_idx < nmatch; ++reg_idx) | |
15a7d175 | 789 | pmatch[reg_idx].rm_so = pmatch[reg_idx].rm_eo = -1; |
3b0bdc72 UD |
790 | |
791 | /* Set the points where matching start/end. */ | |
612546c6 | 792 | pmatch[0].rm_so = 0; |
6291ee3c | 793 | pmatch[0].rm_eo = mctx.match_last; |
3b0bdc72 UD |
794 | |
795 | if (!preg->no_sub && nmatch > 1) | |
15a7d175 | 796 | { |
15a7d175 UD |
797 | err = set_regs (preg, &mctx, nmatch, pmatch, |
798 | dfa->has_plural_match && dfa->nbackref > 0); | |
799 | if (BE (err != REG_NOERROR, 0)) | |
800 | goto free_return; | |
801 | } | |
612546c6 UD |
802 | |
803 | /* At last, add the offset to the each registers, since we slided | |
15a7d175 | 804 | the buffers so that We can assume that the matching starts from 0. */ |
612546c6 | 805 | for (reg_idx = 0; reg_idx < nmatch; ++reg_idx) |
15a7d175 UD |
806 | if (pmatch[reg_idx].rm_so != -1) |
807 | { | |
808 | pmatch[reg_idx].rm_so += match_first; | |
809 | pmatch[reg_idx].rm_eo += match_first; | |
810 | } | |
3b0bdc72 | 811 | } |
1b2c2628 UD |
812 | err = (match_last == -1) ? REG_NOMATCH : REG_NOERROR; |
813 | free_return: | |
612546c6 | 814 | re_free (mctx.state_log); |
3b0bdc72 UD |
815 | if (dfa->nbackref) |
816 | match_ctx_free (&mctx); | |
817 | re_string_destruct (&input); | |
1b2c2628 | 818 | return err; |
3b0bdc72 UD |
819 | } |
820 | ||
6291ee3c UD |
821 | static reg_errcode_t |
822 | prune_impossible_nodes (preg, mctx) | |
823 | const regex_t *preg; | |
824 | re_match_context_t *mctx; | |
825 | { | |
826 | int halt_node, match_last; | |
827 | reg_errcode_t ret; | |
828 | re_dfa_t *dfa = (re_dfa_t *)preg->buffer; | |
829 | re_dfastate_t **sifted_states; | |
830 | re_dfastate_t **lim_states = NULL; | |
831 | re_sift_context_t sctx; | |
832 | #ifdef DEBUG | |
833 | assert (mctx->state_log != NULL); | |
834 | #endif | |
835 | match_last = mctx->match_last; | |
836 | halt_node = mctx->last_node; | |
837 | sifted_states = re_malloc (re_dfastate_t *, match_last + 1); | |
838 | if (BE (sifted_states == NULL, 0)) | |
839 | { | |
840 | ret = REG_ESPACE; | |
841 | goto free_return; | |
842 | } | |
843 | if (dfa->nbackref) | |
844 | { | |
845 | lim_states = re_malloc (re_dfastate_t *, match_last + 1); | |
846 | if (BE (lim_states == NULL, 0)) | |
847 | { | |
848 | ret = REG_ESPACE; | |
849 | goto free_return; | |
850 | } | |
851 | while (1) | |
852 | { | |
853 | memset (lim_states, '\0', | |
854 | sizeof (re_dfastate_t *) * (match_last + 1)); | |
855 | match_ctx_clear_flag (mctx); | |
856 | sift_ctx_init (&sctx, sifted_states, lim_states, halt_node, | |
857 | match_last, 0); | |
858 | ret = sift_states_backward (preg, mctx, &sctx); | |
859 | re_node_set_free (&sctx.limits); | |
860 | if (BE (ret != REG_NOERROR, 0)) | |
861 | goto free_return; | |
862 | if (sifted_states[0] != NULL || lim_states[0] != NULL) | |
863 | break; | |
864 | do | |
865 | { | |
866 | --match_last; | |
867 | if (match_last < 0) | |
868 | { | |
869 | ret = REG_NOMATCH; | |
870 | goto free_return; | |
871 | } | |
872 | } while (!mctx->state_log[match_last]->halt); | |
873 | halt_node = check_halt_state_context (preg, | |
874 | mctx->state_log[match_last], | |
875 | mctx, match_last); | |
876 | } | |
877 | ret = merge_state_array (dfa, sifted_states, lim_states, | |
878 | match_last + 1); | |
879 | re_free (lim_states); | |
880 | lim_states = NULL; | |
881 | if (BE (ret != REG_NOERROR, 0)) | |
882 | goto free_return; | |
883 | } | |
884 | else | |
885 | { | |
886 | sift_ctx_init (&sctx, sifted_states, lim_states, halt_node, | |
887 | match_last, 0); | |
888 | ret = sift_states_backward (preg, mctx, &sctx); | |
889 | re_node_set_free (&sctx.limits); | |
890 | if (BE (ret != REG_NOERROR, 0)) | |
891 | goto free_return; | |
892 | } | |
893 | re_free (mctx->state_log); | |
894 | mctx->state_log = sifted_states; | |
895 | sifted_states = NULL; | |
896 | mctx->last_node = halt_node; | |
897 | mctx->match_last = match_last; | |
898 | ret = REG_NOERROR; | |
899 | free_return: | |
900 | re_free (sifted_states); | |
901 | re_free (lim_states); | |
902 | return ret; | |
903 | } | |
904 | ||
a9388965 | 905 | /* Acquire an initial state and return it. |
3b0bdc72 UD |
906 | We must select appropriate initial state depending on the context, |
907 | since initial states may have constraints like "\<", "^", etc.. */ | |
908 | ||
909 | static inline re_dfastate_t * | |
612546c6 | 910 | acquire_init_state_context (err, preg, mctx, idx) |
a9388965 UD |
911 | reg_errcode_t *err; |
912 | const regex_t *preg; | |
612546c6 UD |
913 | const re_match_context_t *mctx; |
914 | int idx; | |
3b0bdc72 UD |
915 | { |
916 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; | |
917 | ||
a9388965 | 918 | *err = REG_NOERROR; |
3b0bdc72 UD |
919 | if (dfa->init_state->has_constraint) |
920 | { | |
921 | unsigned int context; | |
612546c6 | 922 | context = re_string_context_at (mctx->input, idx - 1, mctx->eflags, |
15a7d175 | 923 | preg->newline_anchor); |
3b0bdc72 | 924 | if (IS_WORD_CONTEXT (context)) |
15a7d175 | 925 | return dfa->init_state_word; |
3b0bdc72 | 926 | else if (IS_ORDINARY_CONTEXT (context)) |
15a7d175 | 927 | return dfa->init_state; |
3b0bdc72 | 928 | else if (IS_BEGBUF_CONTEXT (context) && IS_NEWLINE_CONTEXT (context)) |
15a7d175 | 929 | return dfa->init_state_begbuf; |
3b0bdc72 | 930 | else if (IS_NEWLINE_CONTEXT (context)) |
15a7d175 | 931 | return dfa->init_state_nl; |
3b0bdc72 | 932 | else if (IS_BEGBUF_CONTEXT (context)) |
15a7d175 UD |
933 | { |
934 | /* It is relatively rare case, then calculate on demand. */ | |
935 | return re_acquire_state_context (err, dfa, | |
936 | dfa->init_state->entrance_nodes, | |
937 | context); | |
938 | } | |
3b0bdc72 | 939 | else |
15a7d175 UD |
940 | /* Must not happen? */ |
941 | return dfa->init_state; | |
3b0bdc72 UD |
942 | } |
943 | else | |
944 | return dfa->init_state; | |
945 | } | |
946 | ||
947 | /* Check whether the regular expression match input string INPUT or not, | |
a9388965 UD |
948 | and return the index where the matching end, return -1 if not match, |
949 | or return -2 in case of an error. | |
3b0bdc72 | 950 | FL_SEARCH means we must search where the matching starts, |
612546c6 UD |
951 | FL_LONGEST_MATCH means we want the POSIX longest matching. |
952 | Note that the matcher assume that the maching starts from the current | |
953 | index of the buffer. */ | |
3b0bdc72 UD |
954 | |
955 | static int | |
612546c6 | 956 | check_matching (preg, mctx, fl_search, fl_longest_match) |
3b0bdc72 | 957 | const regex_t *preg; |
3b0bdc72 | 958 | re_match_context_t *mctx; |
612546c6 | 959 | int fl_search, fl_longest_match; |
3b0bdc72 | 960 | { |
6291ee3c | 961 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; |
a9388965 | 962 | reg_errcode_t err; |
612546c6 UD |
963 | int match = 0; |
964 | int match_last = -1; | |
965 | int cur_str_idx = re_string_cur_idx (mctx->input); | |
3b0bdc72 UD |
966 | re_dfastate_t *cur_state; |
967 | ||
612546c6 | 968 | cur_state = acquire_init_state_context (&err, preg, mctx, cur_str_idx); |
a9388965 | 969 | /* An initial state must not be NULL(invalid state). */ |
bc15410e | 970 | if (BE (cur_state == NULL, 0)) |
a9388965 | 971 | return -2; |
612546c6 UD |
972 | if (mctx->state_log != NULL) |
973 | mctx->state_log[cur_str_idx] = cur_state; | |
0742e48e | 974 | |
6291ee3c UD |
975 | /* Check OP_OPEN_SUBEXP in the initial state in case that we use them |
976 | later. E.g. Processing back references. */ | |
977 | if (dfa->nbackref) | |
978 | { | |
979 | err = check_subexp_matching_top (dfa, mctx, &cur_state->nodes, 0); | |
980 | if (BE (err != REG_NOERROR, 0)) | |
981 | return err; | |
982 | } | |
983 | ||
0742e48e UD |
984 | if (cur_state->has_backref) |
985 | { | |
6291ee3c UD |
986 | err = transit_state_bkref (preg, &cur_state->nodes, mctx); |
987 | if (BE (err != REG_NOERROR, 0)) | |
988 | return err; | |
0742e48e UD |
989 | } |
990 | ||
3b0bdc72 UD |
991 | /* If the RE accepts NULL string. */ |
992 | if (cur_state->halt) | |
993 | { | |
994 | if (!cur_state->has_constraint | |
15a7d175 UD |
995 | || check_halt_state_context (preg, cur_state, mctx, cur_str_idx)) |
996 | { | |
997 | if (!fl_longest_match) | |
998 | return cur_str_idx; | |
999 | else | |
1000 | { | |
1001 | match_last = cur_str_idx; | |
1002 | match = 1; | |
1003 | } | |
1004 | } | |
3b0bdc72 UD |
1005 | } |
1006 | ||
612546c6 | 1007 | while (!re_string_eoi (mctx->input)) |
3b0bdc72 | 1008 | { |
612546c6 | 1009 | cur_state = transit_state (&err, preg, mctx, cur_state, |
15a7d175 | 1010 | fl_search && !match); |
a9388965 | 1011 | if (cur_state == NULL) /* Reached at the invalid state or an error. */ |
15a7d175 UD |
1012 | { |
1013 | cur_str_idx = re_string_cur_idx (mctx->input); | |
1014 | if (BE (err != REG_NOERROR, 0)) | |
1015 | return -2; | |
1016 | if (fl_search && !match) | |
1017 | { | |
1018 | /* Restart from initial state, since we are searching | |
1019 | the point from where matching start. */ | |
3b0bdc72 | 1020 | #ifdef RE_ENABLE_I18N |
15a7d175 UD |
1021 | if (MB_CUR_MAX == 1 |
1022 | || re_string_first_byte (mctx->input, cur_str_idx)) | |
3b0bdc72 | 1023 | #endif /* RE_ENABLE_I18N */ |
15a7d175 UD |
1024 | cur_state = acquire_init_state_context (&err, preg, mctx, |
1025 | cur_str_idx); | |
1026 | if (BE (cur_state == NULL && err != REG_NOERROR, 0)) | |
1027 | return -2; | |
1028 | if (mctx->state_log != NULL) | |
1029 | mctx->state_log[cur_str_idx] = cur_state; | |
1030 | } | |
1031 | else if (!fl_longest_match && match) | |
1032 | break; | |
1033 | else /* (fl_longest_match && match) || (!fl_search && !match) */ | |
1034 | { | |
1035 | if (mctx->state_log == NULL) | |
1036 | break; | |
1037 | else | |
1038 | { | |
1039 | int max = mctx->state_log_top; | |
1040 | for (; cur_str_idx <= max; ++cur_str_idx) | |
1041 | if (mctx->state_log[cur_str_idx] != NULL) | |
1042 | break; | |
1043 | if (cur_str_idx > max) | |
1044 | break; | |
1045 | } | |
1046 | } | |
1047 | } | |
3b0bdc72 UD |
1048 | |
1049 | if (cur_state != NULL && cur_state->halt) | |
15a7d175 UD |
1050 | { |
1051 | /* Reached at a halt state. | |
1052 | Check the halt state can satisfy the current context. */ | |
1053 | if (!cur_state->has_constraint | |
1054 | || check_halt_state_context (preg, cur_state, mctx, | |
1055 | re_string_cur_idx (mctx->input))) | |
1056 | { | |
1057 | /* We found an appropriate halt state. */ | |
1058 | match_last = re_string_cur_idx (mctx->input); | |
1059 | match = 1; | |
1060 | if (!fl_longest_match) | |
1061 | break; | |
1062 | } | |
1063 | } | |
3b0bdc72 UD |
1064 | } |
1065 | return match_last; | |
1066 | } | |
1067 | ||
1068 | /* Check NODE match the current context. */ | |
1069 | ||
1070 | static int check_halt_node_context (dfa, node, context) | |
1071 | const re_dfa_t *dfa; | |
1072 | int node; | |
1073 | unsigned int context; | |
1074 | { | |
3b0bdc72 | 1075 | re_token_type_t type = dfa->nodes[node].type; |
485d775d UD |
1076 | unsigned int constraint = dfa->nodes[node].constraint; |
1077 | if (type != END_OF_RE) | |
3b0bdc72 | 1078 | return 0; |
485d775d UD |
1079 | if (!constraint) |
1080 | return 1; | |
1081 | if (NOT_SATISFY_NEXT_CONSTRAINT (constraint, context)) | |
3b0bdc72 UD |
1082 | return 0; |
1083 | return 1; | |
1084 | } | |
1085 | ||
1086 | /* Check the halt state STATE match the current context. | |
1087 | Return 0 if not match, if the node, STATE has, is a halt node and | |
1088 | match the context, return the node. */ | |
1089 | ||
1090 | static int | |
612546c6 | 1091 | check_halt_state_context (preg, state, mctx, idx) |
3b0bdc72 UD |
1092 | const regex_t *preg; |
1093 | const re_dfastate_t *state; | |
612546c6 UD |
1094 | const re_match_context_t *mctx; |
1095 | int idx; | |
3b0bdc72 UD |
1096 | { |
1097 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; | |
1098 | int i; | |
1099 | unsigned int context; | |
1100 | #ifdef DEBUG | |
1101 | assert (state->halt); | |
1102 | #endif | |
612546c6 | 1103 | context = re_string_context_at (mctx->input, idx, mctx->eflags, |
15a7d175 | 1104 | preg->newline_anchor); |
3b0bdc72 UD |
1105 | for (i = 0; i < state->nodes.nelem; ++i) |
1106 | if (check_halt_node_context (dfa, state->nodes.elems[i], context)) | |
1107 | return state->nodes.elems[i]; | |
1108 | return 0; | |
1109 | } | |
1110 | ||
a9388965 UD |
1111 | /* Compute the next node to which "NFA" transit from NODE("NFA" is a NFA |
1112 | corresponding to the DFA). | |
1113 | Return the destination node, and update EPS_VIA_NODES, return -1 in case | |
1114 | of errors. */ | |
3b0bdc72 UD |
1115 | |
1116 | static int | |
a3022b82 | 1117 | proceed_next_node (preg, nregs, regs, mctx, pidx, node, eps_via_nodes, fs) |
3b0bdc72 | 1118 | const regex_t *preg; |
0742e48e | 1119 | regmatch_t *regs; |
3b0bdc72 | 1120 | const re_match_context_t *mctx; |
a3022b82 | 1121 | int nregs, *pidx, node; |
3b0bdc72 | 1122 | re_node_set *eps_via_nodes; |
a3022b82 | 1123 | struct re_fail_stack_t *fs; |
3b0bdc72 UD |
1124 | { |
1125 | re_dfa_t *dfa = (re_dfa_t *)preg->buffer; | |
485d775d | 1126 | int i, err, dest_node; |
81c64d40 | 1127 | dest_node = -1; |
3b0bdc72 UD |
1128 | if (IS_EPSILON_NODE (dfa->nodes[node].type)) |
1129 | { | |
485d775d UD |
1130 | re_node_set *cur_nodes = &mctx->state_log[*pidx]->nodes; |
1131 | int ndest, dest_nodes[2]; | |
a9388965 | 1132 | err = re_node_set_insert (eps_via_nodes, node); |
bc15410e | 1133 | if (BE (err < 0, 0)) |
15a7d175 | 1134 | return -1; |
a3022b82 | 1135 | /* Pick up valid destinations. */ |
485d775d | 1136 | for (ndest = 0, i = 0; i < dfa->edests[node].nelem; ++i) |
15a7d175 UD |
1137 | { |
1138 | int candidate = dfa->edests[node].elems[i]; | |
1139 | if (!re_node_set_contains (cur_nodes, candidate)) | |
1140 | continue; | |
1141 | dest_nodes[0] = (ndest == 0) ? candidate : dest_nodes[0]; | |
1142 | dest_nodes[1] = (ndest == 1) ? candidate : dest_nodes[1]; | |
1143 | ++ndest; | |
1144 | } | |
a3022b82 | 1145 | if (ndest <= 1) |
15a7d175 | 1146 | return ndest == 0 ? -1 : (ndest == 1 ? dest_nodes[0] : 0); |
a3022b82 UD |
1147 | /* In order to avoid infinite loop like "(a*)*". */ |
1148 | if (re_node_set_contains (eps_via_nodes, dest_nodes[0])) | |
15a7d175 | 1149 | return dest_nodes[1]; |
a3022b82 | 1150 | if (fs != NULL) |
15a7d175 | 1151 | push_fail_stack (fs, *pidx, dest_nodes, nregs, regs, eps_via_nodes); |
a3022b82 | 1152 | return dest_nodes[0]; |
3b0bdc72 UD |
1153 | } |
1154 | else | |
1155 | { | |
485d775d | 1156 | int naccepted = 0; |
3b0bdc72 | 1157 | re_token_type_t type = dfa->nodes[node].type; |
3b0bdc72 | 1158 | |
434d3784 | 1159 | #ifdef RE_ENABLE_I18N |
3b0bdc72 | 1160 | if (ACCEPT_MB_NODE (type)) |
15a7d175 | 1161 | naccepted = check_node_accept_bytes (preg, node, mctx->input, *pidx); |
434d3784 UD |
1162 | else |
1163 | #endif /* RE_ENABLE_I18N */ | |
1164 | if (type == OP_BACK_REF) | |
15a7d175 UD |
1165 | { |
1166 | int subexp_idx = dfa->nodes[node].opr.idx; | |
1167 | naccepted = regs[subexp_idx].rm_eo - regs[subexp_idx].rm_so; | |
1168 | if (fs != NULL) | |
1169 | { | |
1170 | if (regs[subexp_idx].rm_so == -1 || regs[subexp_idx].rm_eo == -1) | |
1171 | return -1; | |
1172 | else if (naccepted) | |
1173 | { | |
85c54a32 | 1174 | char *buf = (char *) re_string_get_buffer (mctx->input); |
6291ee3c UD |
1175 | if (memcmp (buf + regs[subexp_idx].rm_so, buf + *pidx, |
1176 | naccepted) != 0) | |
15a7d175 UD |
1177 | return -1; |
1178 | } | |
1179 | } | |
1180 | ||
1181 | if (naccepted == 0) | |
1182 | { | |
1183 | err = re_node_set_insert (eps_via_nodes, node); | |
1184 | if (BE (err < 0, 0)) | |
1185 | return -2; | |
1186 | dest_node = dfa->edests[node].elems[0]; | |
1187 | if (re_node_set_contains (&mctx->state_log[*pidx]->nodes, | |
1188 | dest_node)) | |
1189 | return dest_node; | |
1190 | } | |
1191 | } | |
3b0bdc72 UD |
1192 | |
1193 | if (naccepted != 0 | |
15a7d175 UD |
1194 | || check_node_accept (preg, dfa->nodes + node, mctx, *pidx)) |
1195 | { | |
1196 | dest_node = dfa->nexts[node]; | |
1197 | *pidx = (naccepted == 0) ? *pidx + 1 : *pidx + naccepted; | |
1198 | if (fs && (*pidx > mctx->match_last || mctx->state_log[*pidx] == NULL | |
1199 | || !re_node_set_contains (&mctx->state_log[*pidx]->nodes, | |
1200 | dest_node))) | |
1201 | return -1; | |
1202 | re_node_set_empty (eps_via_nodes); | |
1203 | return dest_node; | |
1204 | } | |
3b0bdc72 | 1205 | } |
a3022b82 UD |
1206 | return -1; |
1207 | } | |
1208 | ||
1209 | static reg_errcode_t | |
1210 | push_fail_stack (fs, str_idx, dests, nregs, regs, eps_via_nodes) | |
1211 | struct re_fail_stack_t *fs; | |
1212 | int str_idx, *dests, nregs; | |
1213 | regmatch_t *regs; | |
1214 | re_node_set *eps_via_nodes; | |
1215 | { | |
1216 | reg_errcode_t err; | |
1217 | int num = fs->num++; | |
1218 | if (fs->num == fs->alloc) | |
1219 | { | |
1b2c2628 | 1220 | struct re_fail_stack_ent_t *new_array; |
a3022b82 | 1221 | fs->alloc *= 2; |
1b2c2628 | 1222 | new_array = realloc (fs->stack, (sizeof (struct re_fail_stack_ent_t) |
15a7d175 | 1223 | * fs->alloc)); |
1b2c2628 | 1224 | if (new_array == NULL) |
15a7d175 | 1225 | return REG_ESPACE; |
1b2c2628 | 1226 | fs->stack = new_array; |
a3022b82 UD |
1227 | } |
1228 | fs->stack[num].idx = str_idx; | |
1229 | fs->stack[num].node = dests[1]; | |
1230 | fs->stack[num].regs = re_malloc (regmatch_t, nregs); | |
1231 | memcpy (fs->stack[num].regs, regs, sizeof (regmatch_t) * nregs); | |
1232 | err = re_node_set_init_copy (&fs->stack[num].eps_via_nodes, eps_via_nodes); | |
1233 | return err; | |
1234 | } | |
1b2c2628 | 1235 | |
a3022b82 UD |
1236 | static int |
1237 | pop_fail_stack (fs, pidx, nregs, regs, eps_via_nodes) | |
1238 | struct re_fail_stack_t *fs; | |
1239 | int *pidx, nregs; | |
1240 | regmatch_t *regs; | |
1241 | re_node_set *eps_via_nodes; | |
1242 | { | |
1243 | int num = --fs->num; | |
1244 | assert (num >= 0); | |
1245 | *pidx = fs->stack[num].idx; | |
1246 | memcpy (regs, fs->stack[num].regs, sizeof (regmatch_t) * nregs); | |
1247 | re_node_set_free (eps_via_nodes); | |
485d775d | 1248 | re_free (fs->stack[num].regs); |
a3022b82 UD |
1249 | *eps_via_nodes = fs->stack[num].eps_via_nodes; |
1250 | return fs->stack[num].node; | |
3b0bdc72 UD |
1251 | } |
1252 | ||
1253 | /* Set the positions where the subexpressions are starts/ends to registers | |
1254 | PMATCH. | |
1255 | Note: We assume that pmatch[0] is already set, and | |
1256 | pmatch[i].rm_so == pmatch[i].rm_eo == -1 (i > 1). */ | |
1257 | ||
a9388965 | 1258 | static reg_errcode_t |
a3022b82 UD |
1259 | set_regs (preg, mctx, nmatch, pmatch, fl_backtrack) |
1260 | const regex_t *preg; | |
1261 | const re_match_context_t *mctx; | |
1262 | size_t nmatch; | |
1263 | regmatch_t *pmatch; | |
1264 | int fl_backtrack; | |
3b0bdc72 UD |
1265 | { |
1266 | re_dfa_t *dfa = (re_dfa_t *)preg->buffer; | |
81c64d40 | 1267 | int idx, cur_node, real_nmatch; |
3b0bdc72 | 1268 | re_node_set eps_via_nodes; |
a3022b82 UD |
1269 | struct re_fail_stack_t *fs; |
1270 | struct re_fail_stack_t fs_body = {0, 2, NULL}; | |
3b0bdc72 UD |
1271 | #ifdef DEBUG |
1272 | assert (nmatch > 1); | |
612546c6 | 1273 | assert (mctx->state_log != NULL); |
3b0bdc72 | 1274 | #endif |
a3022b82 UD |
1275 | if (fl_backtrack) |
1276 | { | |
1277 | fs = &fs_body; | |
1278 | fs->stack = re_malloc (struct re_fail_stack_ent_t, fs->alloc); | |
1279 | } | |
1280 | else | |
1281 | fs = NULL; | |
3b0bdc72 UD |
1282 | cur_node = dfa->init_node; |
1283 | real_nmatch = (nmatch <= preg->re_nsub) ? nmatch : preg->re_nsub + 1; | |
1284 | re_node_set_init_empty (&eps_via_nodes); | |
1285 | for (idx = pmatch[0].rm_so; idx <= pmatch[0].rm_eo ;) | |
1286 | { | |
81c64d40 | 1287 | update_regs (dfa, pmatch, cur_node, idx, real_nmatch); |
a3022b82 | 1288 | if (idx == pmatch[0].rm_eo && cur_node == mctx->last_node) |
15a7d175 UD |
1289 | { |
1290 | int reg_idx; | |
1291 | if (fs) | |
1292 | { | |
1293 | for (reg_idx = 0; reg_idx < nmatch; ++reg_idx) | |
1294 | if (pmatch[reg_idx].rm_so > -1 && pmatch[reg_idx].rm_eo == -1) | |
1295 | break; | |
1296 | if (reg_idx == nmatch) | |
1297 | { | |
1298 | re_node_set_free (&eps_via_nodes); | |
1299 | return free_fail_stack_return (fs); | |
1300 | } | |
1301 | cur_node = pop_fail_stack (fs, &idx, nmatch, pmatch, | |
1302 | &eps_via_nodes); | |
1303 | } | |
1304 | else | |
1305 | { | |
1306 | re_node_set_free (&eps_via_nodes); | |
1307 | return REG_NOERROR; | |
1308 | } | |
1309 | } | |
3b0bdc72 UD |
1310 | |
1311 | /* Proceed to next node. */ | |
a3022b82 | 1312 | cur_node = proceed_next_node (preg, nmatch, pmatch, mctx, &idx, cur_node, |
15a7d175 | 1313 | &eps_via_nodes, fs); |
a3022b82 | 1314 | |
bc15410e | 1315 | if (BE (cur_node < 0, 0)) |
15a7d175 UD |
1316 | { |
1317 | if (cur_node == -2) | |
1318 | return REG_ESPACE; | |
1319 | if (fs) | |
1320 | cur_node = pop_fail_stack (fs, &idx, nmatch, pmatch, | |
1321 | &eps_via_nodes); | |
1322 | else | |
1323 | { | |
1324 | re_node_set_free (&eps_via_nodes); | |
1325 | return REG_NOMATCH; | |
1326 | } | |
1327 | } | |
3b0bdc72 UD |
1328 | } |
1329 | re_node_set_free (&eps_via_nodes); | |
485d775d UD |
1330 | return free_fail_stack_return (fs); |
1331 | } | |
1332 | ||
1333 | static reg_errcode_t | |
1334 | free_fail_stack_return (fs) | |
1335 | struct re_fail_stack_t *fs; | |
1336 | { | |
1337 | if (fs) | |
1338 | { | |
1339 | int fs_idx; | |
1340 | for (fs_idx = 0; fs_idx < fs->num; ++fs_idx) | |
15a7d175 UD |
1341 | { |
1342 | re_node_set_free (&fs->stack[fs_idx].eps_via_nodes); | |
1343 | re_free (fs->stack[fs_idx].regs); | |
1344 | } | |
485d775d UD |
1345 | re_free (fs->stack); |
1346 | } | |
a9388965 | 1347 | return REG_NOERROR; |
3b0bdc72 UD |
1348 | } |
1349 | ||
81c64d40 UD |
1350 | static void |
1351 | update_regs (dfa, pmatch, cur_node, cur_idx, nmatch) | |
1352 | re_dfa_t *dfa; | |
1353 | regmatch_t *pmatch; | |
1354 | int cur_node, cur_idx, nmatch; | |
1355 | { | |
1356 | int type = dfa->nodes[cur_node].type; | |
1357 | int reg_num; | |
1358 | if (type != OP_OPEN_SUBEXP && type != OP_CLOSE_SUBEXP) | |
1359 | return; | |
1360 | reg_num = dfa->nodes[cur_node].opr.idx + 1; | |
1361 | if (reg_num >= nmatch) | |
1362 | return; | |
1363 | if (type == OP_OPEN_SUBEXP) | |
1364 | { | |
1365 | /* We are at the first node of this sub expression. */ | |
1366 | pmatch[reg_num].rm_so = cur_idx; | |
1367 | pmatch[reg_num].rm_eo = -1; | |
1368 | } | |
1369 | else if (type == OP_CLOSE_SUBEXP) | |
1370 | /* We are at the first node of this sub expression. */ | |
1371 | pmatch[reg_num].rm_eo = cur_idx; | |
0742e48e | 1372 | } |
81c64d40 | 1373 | |
3b0bdc72 UD |
1374 | #define NUMBER_OF_STATE 1 |
1375 | ||
0742e48e | 1376 | /* This function checks the STATE_LOG from the SCTX->last_str_idx to 0 |
612546c6 UD |
1377 | and sift the nodes in each states according to the following rules. |
1378 | Updated state_log will be wrote to STATE_LOG. | |
3b0bdc72 UD |
1379 | |
1380 | Rules: We throw away the Node `a' in the STATE_LOG[STR_IDX] if... | |
1381 | 1. When STR_IDX == MATCH_LAST(the last index in the state_log): | |
15a7d175 UD |
1382 | If `a' isn't the LAST_NODE and `a' can't epsilon transit to |
1383 | the LAST_NODE, we throw away the node `a'. | |
612546c6 | 1384 | 2. When 0 <= STR_IDX < MATCH_LAST and `a' accepts |
15a7d175 UD |
1385 | string `s' and transit to `b': |
1386 | i. If 'b' isn't in the STATE_LOG[STR_IDX+strlen('s')], we throw | |
1387 | away the node `a'. | |
1388 | ii. If 'b' is in the STATE_LOG[STR_IDX+strlen('s')] but 'b' is | |
1389 | throwed away, we throw away the node `a'. | |
3b0bdc72 | 1390 | 3. When 0 <= STR_IDX < n and 'a' epsilon transit to 'b': |
15a7d175 UD |
1391 | i. If 'b' isn't in the STATE_LOG[STR_IDX], we throw away the |
1392 | node `a'. | |
1393 | ii. If 'b' is in the STATE_LOG[STR_IDX] but 'b' is throwed away, | |
1394 | we throw away the node `a'. */ | |
3b0bdc72 UD |
1395 | |
1396 | #define STATE_NODE_CONTAINS(state,node) \ | |
1397 | ((state) != NULL && re_node_set_contains (&(state)->nodes, node)) | |
1398 | ||
a9388965 | 1399 | static reg_errcode_t |
0742e48e UD |
1400 | sift_states_backward (preg, mctx, sctx) |
1401 | const regex_t *preg; | |
1402 | re_match_context_t *mctx; | |
1403 | re_sift_context_t *sctx; | |
3b0bdc72 | 1404 | { |
a9388965 | 1405 | reg_errcode_t err; |
3b0bdc72 | 1406 | re_dfa_t *dfa = (re_dfa_t *)preg->buffer; |
0742e48e UD |
1407 | int null_cnt = 0; |
1408 | int str_idx = sctx->last_str_idx; | |
1409 | re_node_set cur_dest; | |
1410 | re_node_set *cur_src; /* Points the state_log[str_idx]->nodes */ | |
3b0bdc72 UD |
1411 | |
1412 | #ifdef DEBUG | |
612546c6 | 1413 | assert (mctx->state_log != NULL && mctx->state_log[str_idx] != NULL); |
3b0bdc72 | 1414 | #endif |
0742e48e | 1415 | cur_src = &mctx->state_log[str_idx]->nodes; |
3b0bdc72 UD |
1416 | |
1417 | /* Build sifted state_log[str_idx]. It has the nodes which can epsilon | |
1418 | transit to the last_node and the last_node itself. */ | |
0742e48e | 1419 | err = re_node_set_init_1 (&cur_dest, sctx->last_node); |
bc15410e | 1420 | if (BE (err != REG_NOERROR, 0)) |
a9388965 | 1421 | return err; |
0742e48e UD |
1422 | err = update_cur_sifted_state (preg, mctx, sctx, str_idx, &cur_dest); |
1423 | if (BE (err != REG_NOERROR, 0)) | |
1b2c2628 | 1424 | goto free_return; |
3b0bdc72 UD |
1425 | |
1426 | /* Then check each states in the state_log. */ | |
612546c6 | 1427 | while (str_idx > 0) |
3b0bdc72 | 1428 | { |
0742e48e | 1429 | int i, ret; |
3b0bdc72 | 1430 | /* Update counters. */ |
0742e48e UD |
1431 | null_cnt = (sctx->sifted_states[str_idx] == NULL) ? null_cnt + 1 : 0; |
1432 | if (null_cnt > mctx->max_mb_elem_len) | |
15a7d175 UD |
1433 | { |
1434 | memset (sctx->sifted_states, '\0', | |
1435 | sizeof (re_dfastate_t *) * str_idx); | |
1436 | re_node_set_free (&cur_dest); | |
1437 | return REG_NOERROR; | |
1438 | } | |
0742e48e | 1439 | re_node_set_empty (&cur_dest); |
3b0bdc72 | 1440 | --str_idx; |
0742e48e | 1441 | cur_src = ((mctx->state_log[str_idx] == NULL) ? &empty_set |
15a7d175 | 1442 | : &mctx->state_log[str_idx]->nodes); |
3b0bdc72 UD |
1443 | |
1444 | /* Then build the next sifted state. | |
15a7d175 UD |
1445 | We build the next sifted state on `cur_dest', and update |
1446 | `sifted_states[str_idx]' with `cur_dest'. | |
1447 | Note: | |
1448 | `cur_dest' is the sifted state from `state_log[str_idx + 1]'. | |
1449 | `cur_src' points the node_set of the old `state_log[str_idx]'. */ | |
0742e48e | 1450 | for (i = 0; i < cur_src->nelem; i++) |
15a7d175 UD |
1451 | { |
1452 | int prev_node = cur_src->elems[i]; | |
1453 | int naccepted = 0; | |
1454 | re_token_type_t type = dfa->nodes[prev_node].type; | |
0742e48e | 1455 | |
15a7d175 UD |
1456 | if (IS_EPSILON_NODE(type)) |
1457 | continue; | |
434d3784 | 1458 | #ifdef RE_ENABLE_I18N |
15a7d175 UD |
1459 | /* If the node may accept `multi byte'. */ |
1460 | if (ACCEPT_MB_NODE (type)) | |
1461 | naccepted = sift_states_iter_mb (preg, mctx, sctx, prev_node, | |
1462 | str_idx, sctx->last_str_idx); | |
3b0bdc72 | 1463 | |
434d3784 | 1464 | #endif /* RE_ENABLE_I18N */ |
15a7d175 UD |
1465 | /* We don't check backreferences here. |
1466 | See update_cur_sifted_state(). */ | |
1467 | ||
1468 | if (!naccepted | |
1469 | && check_node_accept (preg, dfa->nodes + prev_node, mctx, | |
1470 | str_idx) | |
1471 | && STATE_NODE_CONTAINS (sctx->sifted_states[str_idx + 1], | |
1472 | dfa->nexts[prev_node])) | |
1473 | naccepted = 1; | |
1474 | ||
1475 | if (naccepted == 0) | |
1476 | continue; | |
1477 | ||
1478 | if (sctx->limits.nelem) | |
1479 | { | |
1480 | int to_idx = str_idx + naccepted; | |
1481 | if (check_dst_limits (dfa, &sctx->limits, mctx, | |
1482 | dfa->nexts[prev_node], to_idx, | |
1483 | prev_node, str_idx)) | |
1484 | continue; | |
1485 | } | |
1486 | ret = re_node_set_insert (&cur_dest, prev_node); | |
1487 | if (BE (ret == -1, 0)) | |
1488 | { | |
1489 | err = REG_ESPACE; | |
1490 | goto free_return; | |
1491 | } | |
1492 | } | |
3b0bdc72 | 1493 | |
0742e48e | 1494 | /* Add all the nodes which satisfy the following conditions: |
15a7d175 UD |
1495 | - It can epsilon transit to a node in CUR_DEST. |
1496 | - It is in CUR_SRC. | |
1497 | And update state_log. */ | |
0742e48e UD |
1498 | err = update_cur_sifted_state (preg, mctx, sctx, str_idx, &cur_dest); |
1499 | if (BE (err != REG_NOERROR, 0)) | |
15a7d175 | 1500 | goto free_return; |
3b0bdc72 | 1501 | } |
1b2c2628 UD |
1502 | err = REG_NOERROR; |
1503 | free_return: | |
0742e48e | 1504 | re_node_set_free (&cur_dest); |
1b2c2628 | 1505 | return err; |
3b0bdc72 UD |
1506 | } |
1507 | ||
1508 | /* Helper functions. */ | |
1509 | ||
612546c6 UD |
1510 | static inline reg_errcode_t |
1511 | clean_state_log_if_need (mctx, next_state_log_idx) | |
3b0bdc72 UD |
1512 | re_match_context_t *mctx; |
1513 | int next_state_log_idx; | |
1514 | { | |
1515 | int top = mctx->state_log_top; | |
612546c6 UD |
1516 | |
1517 | if (next_state_log_idx >= mctx->input->bufs_len | |
1518 | || (next_state_log_idx >= mctx->input->valid_len | |
15a7d175 | 1519 | && mctx->input->valid_len < mctx->input->len)) |
612546c6 UD |
1520 | { |
1521 | reg_errcode_t err; | |
1522 | err = extend_buffers (mctx); | |
1523 | if (BE (err != REG_NOERROR, 0)) | |
15a7d175 | 1524 | return err; |
612546c6 UD |
1525 | } |
1526 | ||
3b0bdc72 UD |
1527 | if (top < next_state_log_idx) |
1528 | { | |
612546c6 | 1529 | memset (mctx->state_log + top + 1, '\0', |
15a7d175 | 1530 | sizeof (re_dfastate_t *) * (next_state_log_idx - top)); |
3b0bdc72 UD |
1531 | mctx->state_log_top = next_state_log_idx; |
1532 | } | |
612546c6 | 1533 | return REG_NOERROR; |
3b0bdc72 UD |
1534 | } |
1535 | ||
1b2c2628 UD |
1536 | static reg_errcode_t |
1537 | merge_state_array (dfa, dst, src, num) | |
0742e48e UD |
1538 | re_dfa_t *dfa; |
1539 | re_dfastate_t **dst; | |
1540 | re_dfastate_t **src; | |
1541 | int num; | |
3b0bdc72 | 1542 | { |
0742e48e UD |
1543 | int st_idx; |
1544 | reg_errcode_t err; | |
1545 | for (st_idx = 0; st_idx < num; ++st_idx) | |
1546 | { | |
1547 | if (dst[st_idx] == NULL) | |
15a7d175 | 1548 | dst[st_idx] = src[st_idx]; |
0742e48e | 1549 | else if (src[st_idx] != NULL) |
15a7d175 UD |
1550 | { |
1551 | re_node_set merged_set; | |
1552 | err = re_node_set_init_union (&merged_set, &dst[st_idx]->nodes, | |
1553 | &src[st_idx]->nodes); | |
1554 | if (BE (err != REG_NOERROR, 0)) | |
1555 | return err; | |
1556 | dst[st_idx] = re_acquire_state (&err, dfa, &merged_set); | |
1557 | re_node_set_free (&merged_set); | |
1558 | if (BE (err != REG_NOERROR, 0)) | |
1559 | return err; | |
1560 | } | |
0742e48e UD |
1561 | } |
1562 | return REG_NOERROR; | |
3b0bdc72 UD |
1563 | } |
1564 | ||
0742e48e UD |
1565 | static reg_errcode_t |
1566 | update_cur_sifted_state (preg, mctx, sctx, str_idx, dest_nodes) | |
1567 | const regex_t *preg; | |
1568 | re_match_context_t *mctx; | |
1569 | re_sift_context_t *sctx; | |
1570 | int str_idx; | |
1571 | re_node_set *dest_nodes; | |
3b0bdc72 | 1572 | { |
0742e48e UD |
1573 | reg_errcode_t err; |
1574 | re_dfa_t *dfa = (re_dfa_t *)preg->buffer; | |
1575 | const re_node_set *candidates; | |
1576 | candidates = ((mctx->state_log[str_idx] == NULL) ? &empty_set | |
15a7d175 | 1577 | : &mctx->state_log[str_idx]->nodes); |
0742e48e UD |
1578 | |
1579 | /* At first, add the nodes which can epsilon transit to a node in | |
1580 | DEST_NODE. */ | |
485d775d UD |
1581 | if (dest_nodes->nelem) |
1582 | { | |
1583 | err = add_epsilon_src_nodes (dfa, dest_nodes, candidates); | |
1584 | if (BE (err != REG_NOERROR, 0)) | |
1585 | return err; | |
1586 | } | |
0742e48e UD |
1587 | |
1588 | /* Then, check the limitations in the current sift_context. */ | |
485d775d | 1589 | if (dest_nodes->nelem && sctx->limits.nelem) |
0742e48e UD |
1590 | { |
1591 | err = check_subexp_limits (dfa, dest_nodes, candidates, &sctx->limits, | |
15a7d175 | 1592 | mctx->bkref_ents, str_idx); |
0742e48e | 1593 | if (BE (err != REG_NOERROR, 0)) |
15a7d175 | 1594 | return err; |
0742e48e UD |
1595 | } |
1596 | ||
1597 | /* Update state_log. */ | |
1598 | sctx->sifted_states[str_idx] = re_acquire_state (&err, dfa, dest_nodes); | |
1599 | if (BE (sctx->sifted_states[str_idx] == NULL && err != REG_NOERROR, 0)) | |
1600 | return err; | |
1601 | ||
0742e48e UD |
1602 | if ((mctx->state_log[str_idx] != NULL |
1603 | && mctx->state_log[str_idx]->has_backref)) | |
1604 | { | |
1605 | err = sift_states_bkref (preg, mctx, sctx, str_idx, dest_nodes); | |
1606 | if (BE (err != REG_NOERROR, 0)) | |
15a7d175 | 1607 | return err; |
0742e48e UD |
1608 | } |
1609 | return REG_NOERROR; | |
3b0bdc72 UD |
1610 | } |
1611 | ||
a9388965 | 1612 | static reg_errcode_t |
0742e48e UD |
1613 | add_epsilon_src_nodes (dfa, dest_nodes, candidates) |
1614 | re_dfa_t *dfa; | |
1615 | re_node_set *dest_nodes; | |
1616 | const re_node_set *candidates; | |
3b0bdc72 | 1617 | { |
0742e48e UD |
1618 | reg_errcode_t err; |
1619 | int src_idx; | |
1620 | re_node_set src_copy; | |
1621 | ||
1622 | err = re_node_set_init_copy (&src_copy, dest_nodes); | |
1623 | if (BE (err != REG_NOERROR, 0)) | |
1624 | return err; | |
1625 | for (src_idx = 0; src_idx < src_copy.nelem; ++src_idx) | |
3b0bdc72 | 1626 | { |
0742e48e | 1627 | err = re_node_set_add_intersect (dest_nodes, candidates, |
15a7d175 UD |
1628 | dfa->inveclosures |
1629 | + src_copy.elems[src_idx]); | |
0742e48e | 1630 | if (BE (err != REG_NOERROR, 0)) |
15a7d175 UD |
1631 | { |
1632 | re_node_set_free (&src_copy); | |
1633 | return err; | |
1634 | } | |
0742e48e UD |
1635 | } |
1636 | re_node_set_free (&src_copy); | |
1637 | return REG_NOERROR; | |
1638 | } | |
3b0bdc72 | 1639 | |
0742e48e UD |
1640 | static reg_errcode_t |
1641 | sub_epsilon_src_nodes (dfa, node, dest_nodes, candidates) | |
1642 | re_dfa_t *dfa; | |
1643 | int node; | |
1644 | re_node_set *dest_nodes; | |
1645 | const re_node_set *candidates; | |
1646 | { | |
1647 | int ecl_idx; | |
1648 | reg_errcode_t err; | |
1649 | re_node_set *inv_eclosure = dfa->inveclosures + node; | |
1650 | re_node_set except_nodes; | |
1651 | re_node_set_init_empty (&except_nodes); | |
1652 | for (ecl_idx = 0; ecl_idx < inv_eclosure->nelem; ++ecl_idx) | |
1653 | { | |
15a7d175 UD |
1654 | int cur_node = inv_eclosure->elems[ecl_idx]; |
1655 | if (cur_node == node) | |
1656 | continue; | |
1657 | if (IS_EPSILON_NODE (dfa->nodes[cur_node].type)) | |
1658 | { | |
1659 | int edst1 = dfa->edests[cur_node].elems[0]; | |
1660 | int edst2 = ((dfa->edests[cur_node].nelem > 1) | |
1661 | ? dfa->edests[cur_node].elems[1] : -1); | |
1662 | if ((!re_node_set_contains (inv_eclosure, edst1) | |
1663 | && re_node_set_contains (dest_nodes, edst1)) | |
1664 | || (edst2 > 0 | |
1665 | && !re_node_set_contains (inv_eclosure, edst2) | |
1666 | && re_node_set_contains (dest_nodes, edst2))) | |
1667 | { | |
1668 | err = re_node_set_add_intersect (&except_nodes, candidates, | |
1669 | dfa->inveclosures + cur_node); | |
1670 | if (BE (err != REG_NOERROR, 0)) | |
1671 | { | |
1672 | re_node_set_free (&except_nodes); | |
1673 | return err; | |
1674 | } | |
1675 | } | |
1676 | } | |
0742e48e UD |
1677 | } |
1678 | for (ecl_idx = 0; ecl_idx < inv_eclosure->nelem; ++ecl_idx) | |
1679 | { | |
15a7d175 UD |
1680 | int cur_node = inv_eclosure->elems[ecl_idx]; |
1681 | if (!re_node_set_contains (&except_nodes, cur_node)) | |
1682 | { | |
1683 | int idx = re_node_set_contains (dest_nodes, cur_node) - 1; | |
1684 | re_node_set_remove_at (dest_nodes, idx); | |
1685 | } | |
0742e48e UD |
1686 | } |
1687 | re_node_set_free (&except_nodes); | |
1688 | return REG_NOERROR; | |
1689 | } | |
1690 | ||
a3022b82 UD |
1691 | static int |
1692 | check_dst_limits (dfa, limits, mctx, dst_node, dst_idx, src_node, src_idx) | |
1693 | re_dfa_t *dfa; | |
1694 | re_node_set *limits; | |
1695 | re_match_context_t *mctx; | |
1696 | int dst_node, dst_idx, src_node, src_idx; | |
1697 | { | |
1698 | int lim_idx, src_pos, dst_pos; | |
1699 | ||
1700 | for (lim_idx = 0; lim_idx < limits->nelem; ++lim_idx) | |
1701 | { | |
485d775d | 1702 | int subexp_idx; |
a3022b82 UD |
1703 | struct re_backref_cache_entry *ent; |
1704 | ent = mctx->bkref_ents + limits->elems[lim_idx]; | |
485d775d | 1705 | subexp_idx = dfa->nodes[ent->node].opr.idx - 1; |
a3022b82 UD |
1706 | |
1707 | dst_pos = check_dst_limits_calc_pos (dfa, mctx, limits->elems[lim_idx], | |
15a7d175 UD |
1708 | dfa->eclosures + dst_node, |
1709 | subexp_idx, dst_node, dst_idx); | |
a3022b82 | 1710 | src_pos = check_dst_limits_calc_pos (dfa, mctx, limits->elems[lim_idx], |
15a7d175 UD |
1711 | dfa->eclosures + src_node, |
1712 | subexp_idx, src_node, src_idx); | |
a3022b82 UD |
1713 | |
1714 | /* In case of: | |
15a7d175 UD |
1715 | <src> <dst> ( <subexp> ) |
1716 | ( <subexp> ) <src> <dst> | |
1717 | ( <subexp1> <src> <subexp2> <dst> <subexp3> ) */ | |
a3022b82 | 1718 | if (src_pos == dst_pos) |
15a7d175 | 1719 | continue; /* This is unrelated limitation. */ |
a3022b82 | 1720 | else |
15a7d175 | 1721 | return 1; |
a3022b82 UD |
1722 | } |
1723 | return 0; | |
1724 | } | |
1725 | ||
1726 | static int | |
1727 | check_dst_limits_calc_pos (dfa, mctx, limit, eclosures, subexp_idx, node, | |
15a7d175 | 1728 | str_idx) |
a3022b82 UD |
1729 | re_dfa_t *dfa; |
1730 | re_match_context_t *mctx; | |
1731 | re_node_set *eclosures; | |
1732 | int limit, subexp_idx, node, str_idx; | |
1733 | { | |
1734 | struct re_backref_cache_entry *lim = mctx->bkref_ents + limit; | |
1735 | int pos = (str_idx < lim->subexp_from ? -1 | |
15a7d175 | 1736 | : (lim->subexp_to < str_idx ? 1 : 0)); |
a3022b82 UD |
1737 | if (pos == 0 |
1738 | && (str_idx == lim->subexp_from || str_idx == lim->subexp_to)) | |
1739 | { | |
1740 | int node_idx; | |
1741 | for (node_idx = 0; node_idx < eclosures->nelem; ++node_idx) | |
15a7d175 UD |
1742 | { |
1743 | int node = eclosures->elems[node_idx]; | |
1744 | re_token_type_t type= dfa->nodes[node].type; | |
1745 | if (type == OP_BACK_REF) | |
1746 | { | |
6291ee3c UD |
1747 | int bi = search_cur_bkref_entry (mctx, str_idx); |
1748 | for (; bi < mctx->nbkref_ents; ++bi) | |
15a7d175 UD |
1749 | { |
1750 | struct re_backref_cache_entry *ent = mctx->bkref_ents + bi; | |
6291ee3c UD |
1751 | if (ent->str_idx > str_idx) |
1752 | break; | |
1753 | if (ent->node == node && ent->subexp_from == ent->subexp_to) | |
15a7d175 UD |
1754 | { |
1755 | int cpos, dst; | |
1756 | dst = dfa->edests[node].elems[0]; | |
1757 | cpos = check_dst_limits_calc_pos (dfa, mctx, limit, | |
1758 | dfa->eclosures + dst, | |
1759 | subexp_idx, dst, | |
1760 | str_idx); | |
1761 | if ((str_idx == lim->subexp_from && cpos == -1) | |
1762 | || (str_idx == lim->subexp_to && cpos == 0)) | |
1763 | return cpos; | |
1764 | } | |
1765 | } | |
1766 | } | |
1767 | if (type == OP_OPEN_SUBEXP && subexp_idx == dfa->nodes[node].opr.idx | |
1768 | && str_idx == lim->subexp_from) | |
1769 | { | |
1770 | pos = -1; | |
1771 | break; | |
1772 | } | |
1773 | if (type == OP_CLOSE_SUBEXP && subexp_idx == dfa->nodes[node].opr.idx | |
1774 | && str_idx == lim->subexp_to) | |
1775 | break; | |
1776 | } | |
a3022b82 | 1777 | if (node_idx == eclosures->nelem && str_idx == lim->subexp_to) |
15a7d175 | 1778 | pos = 1; |
a3022b82 UD |
1779 | } |
1780 | return pos; | |
1781 | } | |
1782 | ||
0742e48e UD |
1783 | /* Check the limitations of sub expressions LIMITS, and remove the nodes |
1784 | which are against limitations from DEST_NODES. */ | |
1785 | ||
1786 | static reg_errcode_t | |
1787 | check_subexp_limits (dfa, dest_nodes, candidates, limits, bkref_ents, str_idx) | |
1788 | re_dfa_t *dfa; | |
1789 | re_node_set *dest_nodes; | |
1790 | const re_node_set *candidates; | |
1791 | re_node_set *limits; | |
1792 | struct re_backref_cache_entry *bkref_ents; | |
1793 | int str_idx; | |
1794 | { | |
1795 | reg_errcode_t err; | |
1796 | int node_idx, lim_idx; | |
1797 | ||
1798 | for (lim_idx = 0; lim_idx < limits->nelem; ++lim_idx) | |
1799 | { | |
485d775d | 1800 | int subexp_idx; |
0742e48e UD |
1801 | struct re_backref_cache_entry *ent; |
1802 | ent = bkref_ents + limits->elems[lim_idx]; | |
1803 | ||
1804 | if (str_idx <= ent->subexp_from || ent->str_idx < str_idx) | |
15a7d175 | 1805 | continue; /* This is unrelated limitation. */ |
0742e48e | 1806 | |
485d775d | 1807 | subexp_idx = dfa->nodes[ent->node].opr.idx - 1; |
0742e48e | 1808 | if (ent->subexp_to == str_idx) |
15a7d175 UD |
1809 | { |
1810 | int ops_node = -1; | |
1811 | int cls_node = -1; | |
1812 | for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx) | |
1813 | { | |
1814 | int node = dest_nodes->elems[node_idx]; | |
1815 | re_token_type_t type= dfa->nodes[node].type; | |
1816 | if (type == OP_OPEN_SUBEXP | |
1817 | && subexp_idx == dfa->nodes[node].opr.idx) | |
1818 | ops_node = node; | |
1819 | else if (type == OP_CLOSE_SUBEXP | |
1820 | && subexp_idx == dfa->nodes[node].opr.idx) | |
1821 | cls_node = node; | |
1822 | } | |
1823 | ||
1824 | /* Check the limitation of the open subexpression. */ | |
1825 | /* Note that (ent->subexp_to = str_idx != ent->subexp_from). */ | |
1826 | if (ops_node >= 0) | |
1827 | { | |
1828 | err = sub_epsilon_src_nodes(dfa, ops_node, dest_nodes, | |
1829 | candidates); | |
1830 | if (BE (err != REG_NOERROR, 0)) | |
1831 | return err; | |
1832 | } | |
1833 | /* Check the limitation of the close subexpression. */ | |
1834 | for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx) | |
1835 | { | |
1836 | int node = dest_nodes->elems[node_idx]; | |
1837 | if (!re_node_set_contains (dfa->inveclosures + node, cls_node) | |
1838 | && !re_node_set_contains (dfa->eclosures + node, cls_node)) | |
1839 | { | |
1840 | /* It is against this limitation. | |
1841 | Remove it form the current sifted state. */ | |
1842 | err = sub_epsilon_src_nodes(dfa, node, dest_nodes, | |
1843 | candidates); | |
1844 | if (BE (err != REG_NOERROR, 0)) | |
1845 | return err; | |
1846 | --node_idx; | |
1847 | } | |
1848 | } | |
1849 | } | |
0742e48e | 1850 | else /* (ent->subexp_to != str_idx) */ |
15a7d175 UD |
1851 | { |
1852 | for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx) | |
1853 | { | |
1854 | int node = dest_nodes->elems[node_idx]; | |
1855 | re_token_type_t type= dfa->nodes[node].type; | |
1856 | if (type == OP_CLOSE_SUBEXP || type == OP_OPEN_SUBEXP) | |
1857 | { | |
1858 | if (subexp_idx != dfa->nodes[node].opr.idx) | |
1859 | continue; | |
1860 | if ((type == OP_CLOSE_SUBEXP && ent->subexp_to != str_idx) | |
1861 | || (type == OP_OPEN_SUBEXP)) | |
1862 | { | |
1863 | /* It is against this limitation. | |
1864 | Remove it form the current sifted state. */ | |
1865 | err = sub_epsilon_src_nodes(dfa, node, dest_nodes, | |
1866 | candidates); | |
1867 | if (BE (err != REG_NOERROR, 0)) | |
1868 | return err; | |
1869 | } | |
1870 | } | |
1871 | } | |
1872 | } | |
0742e48e UD |
1873 | } |
1874 | return REG_NOERROR; | |
1875 | } | |
1876 | ||
0742e48e UD |
1877 | static reg_errcode_t |
1878 | sift_states_bkref (preg, mctx, sctx, str_idx, dest_nodes) | |
1879 | const regex_t *preg; | |
1880 | re_match_context_t *mctx; | |
1881 | re_sift_context_t *sctx; | |
1882 | int str_idx; | |
1883 | re_node_set *dest_nodes; | |
1884 | { | |
1885 | reg_errcode_t err; | |
1886 | re_dfa_t *dfa = (re_dfa_t *)preg->buffer; | |
1887 | int node_idx, node; | |
1888 | re_sift_context_t local_sctx; | |
1889 | const re_node_set *candidates; | |
1890 | candidates = ((mctx->state_log[str_idx] == NULL) ? &empty_set | |
15a7d175 | 1891 | : &mctx->state_log[str_idx]->nodes); |
0742e48e UD |
1892 | local_sctx.sifted_states = NULL; /* Mark that it hasn't been initialized. */ |
1893 | ||
1894 | for (node_idx = 0; node_idx < candidates->nelem; ++node_idx) | |
1895 | { | |
0742e48e UD |
1896 | int cur_bkref_idx = re_string_cur_idx (mctx->input); |
1897 | re_token_type_t type; | |
1898 | node = candidates->elems[node_idx]; | |
1899 | type = dfa->nodes[node].type; | |
0742e48e | 1900 | if (node == sctx->cur_bkref && str_idx == cur_bkref_idx) |
15a7d175 | 1901 | continue; |
0742e48e UD |
1902 | /* Avoid infinite loop for the REs like "()\1+". */ |
1903 | if (node == sctx->last_node && str_idx == sctx->last_str_idx) | |
15a7d175 | 1904 | continue; |
0742e48e | 1905 | if (type == OP_BACK_REF) |
15a7d175 | 1906 | { |
6291ee3c UD |
1907 | int enabled_idx = search_cur_bkref_entry (mctx, str_idx); |
1908 | for (; enabled_idx < mctx->nbkref_ents; ++enabled_idx) | |
15a7d175 UD |
1909 | { |
1910 | int disabled_idx, subexp_len, to_idx, dst_node; | |
1911 | struct re_backref_cache_entry *entry; | |
1912 | entry = mctx->bkref_ents + enabled_idx; | |
6291ee3c UD |
1913 | if (entry->str_idx > str_idx) |
1914 | break; | |
1915 | if (entry->node != node) | |
1916 | continue; | |
15a7d175 UD |
1917 | subexp_len = entry->subexp_to - entry->subexp_from; |
1918 | to_idx = str_idx + subexp_len; | |
1919 | dst_node = (subexp_len ? dfa->nexts[node] | |
1920 | : dfa->edests[node].elems[0]); | |
1921 | ||
6291ee3c UD |
1922 | if (to_idx > sctx->last_str_idx |
1923 | || sctx->sifted_states[to_idx] == NULL | |
1924 | || !STATE_NODE_CONTAINS (sctx->sifted_states[to_idx], | |
1925 | dst_node) | |
1926 | || check_dst_limits (dfa, &sctx->limits, mctx, node, | |
1927 | str_idx, dst_node, to_idx)) | |
15a7d175 | 1928 | continue; |
15a7d175 UD |
1929 | { |
1930 | re_dfastate_t *cur_state; | |
1931 | entry->flag = 0; | |
1932 | for (disabled_idx = enabled_idx + 1; | |
1933 | disabled_idx < mctx->nbkref_ents; ++disabled_idx) | |
1934 | { | |
1935 | struct re_backref_cache_entry *entry2; | |
1936 | entry2 = mctx->bkref_ents + disabled_idx; | |
6291ee3c UD |
1937 | if (entry2->str_idx > str_idx) |
1938 | break; | |
1939 | entry2->flag = (entry2->node == node) ? 1 : entry2->flag; | |
15a7d175 UD |
1940 | } |
1941 | ||
1942 | if (local_sctx.sifted_states == NULL) | |
1943 | { | |
1944 | local_sctx = *sctx; | |
1945 | err = re_node_set_init_copy (&local_sctx.limits, | |
1946 | &sctx->limits); | |
1947 | if (BE (err != REG_NOERROR, 0)) | |
1b2c2628 | 1948 | goto free_return; |
15a7d175 UD |
1949 | } |
1950 | local_sctx.last_node = node; | |
1951 | local_sctx.last_str_idx = str_idx; | |
1952 | err = re_node_set_insert (&local_sctx.limits, enabled_idx); | |
1953 | if (BE (err < 0, 0)) | |
1b2c2628 UD |
1954 | { |
1955 | err = REG_ESPACE; | |
1956 | goto free_return; | |
1957 | } | |
15a7d175 UD |
1958 | cur_state = local_sctx.sifted_states[str_idx]; |
1959 | err = sift_states_backward (preg, mctx, &local_sctx); | |
1960 | if (BE (err != REG_NOERROR, 0)) | |
1b2c2628 | 1961 | goto free_return; |
15a7d175 UD |
1962 | if (sctx->limited_states != NULL) |
1963 | { | |
1964 | err = merge_state_array (dfa, sctx->limited_states, | |
1965 | local_sctx.sifted_states, | |
1966 | str_idx + 1); | |
1967 | if (BE (err != REG_NOERROR, 0)) | |
1968 | goto free_return; | |
1969 | } | |
1970 | local_sctx.sifted_states[str_idx] = cur_state; | |
1971 | re_node_set_remove (&local_sctx.limits, enabled_idx); | |
485d775d UD |
1972 | /* We must not use the variable entry here, since |
1973 | mctx->bkref_ents might be realloced. */ | |
1974 | mctx->bkref_ents[enabled_idx].flag = 1; | |
15a7d175 UD |
1975 | } |
1976 | } | |
6291ee3c UD |
1977 | enabled_idx = search_cur_bkref_entry (mctx, str_idx); |
1978 | for (; enabled_idx < mctx->nbkref_ents; ++enabled_idx) | |
15a7d175 UD |
1979 | { |
1980 | struct re_backref_cache_entry *entry; | |
1981 | entry = mctx->bkref_ents + enabled_idx; | |
6291ee3c UD |
1982 | if (entry->str_idx > str_idx) |
1983 | break; | |
1984 | if (entry->node == node) | |
15a7d175 UD |
1985 | entry->flag = 0; |
1986 | } | |
1987 | } | |
0742e48e | 1988 | } |
1b2c2628 UD |
1989 | err = REG_NOERROR; |
1990 | free_return: | |
0742e48e UD |
1991 | if (local_sctx.sifted_states != NULL) |
1992 | { | |
0742e48e UD |
1993 | re_node_set_free (&local_sctx.limits); |
1994 | } | |
1995 | ||
1b2c2628 | 1996 | return err; |
0742e48e UD |
1997 | } |
1998 | ||
1999 | ||
2000 | #ifdef RE_ENABLE_I18N | |
2001 | static int | |
2002 | sift_states_iter_mb (preg, mctx, sctx, node_idx, str_idx, max_str_idx) | |
2003 | const regex_t *preg; | |
2004 | const re_match_context_t *mctx; | |
2005 | re_sift_context_t *sctx; | |
2006 | int node_idx, str_idx, max_str_idx; | |
2007 | { | |
2008 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; | |
2009 | int naccepted; | |
2010 | /* Check the node can accept `multi byte'. */ | |
2011 | naccepted = check_node_accept_bytes (preg, node_idx, mctx->input, str_idx); | |
2012 | if (naccepted > 0 && str_idx + naccepted <= max_str_idx && | |
2013 | !STATE_NODE_CONTAINS (sctx->sifted_states[str_idx + naccepted], | |
15a7d175 | 2014 | dfa->nexts[node_idx])) |
0742e48e UD |
2015 | /* The node can't accept the `multi byte', or the |
2016 | destination was already throwed away, then the node | |
2017 | could't accept the current input `multi byte'. */ | |
2018 | naccepted = 0; | |
2019 | /* Otherwise, it is sure that the node could accept | |
2020 | `naccepted' bytes input. */ | |
2021 | return naccepted; | |
2022 | } | |
2023 | #endif /* RE_ENABLE_I18N */ | |
2024 | ||
3b0bdc72 UD |
2025 | \f |
2026 | /* Functions for state transition. */ | |
2027 | ||
2028 | /* Return the next state to which the current state STATE will transit by | |
2029 | accepting the current input byte, and update STATE_LOG if necessary. | |
2030 | If STATE can accept a multibyte char/collating element/back reference | |
2031 | update the destination of STATE_LOG. */ | |
2032 | ||
2033 | static re_dfastate_t * | |
612546c6 | 2034 | transit_state (err, preg, mctx, state, fl_search) |
a9388965 UD |
2035 | reg_errcode_t *err; |
2036 | const regex_t *preg; | |
a9388965 | 2037 | re_match_context_t *mctx; |
612546c6 UD |
2038 | re_dfastate_t *state; |
2039 | int fl_search; | |
3b0bdc72 UD |
2040 | { |
2041 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; | |
2042 | re_dfastate_t **trtable, *next_state; | |
2043 | unsigned char ch; | |
6291ee3c | 2044 | int cur_idx; |
3b0bdc72 | 2045 | |
612546c6 UD |
2046 | if (re_string_cur_idx (mctx->input) + 1 >= mctx->input->bufs_len |
2047 | || (re_string_cur_idx (mctx->input) + 1 >= mctx->input->valid_len | |
15a7d175 | 2048 | && mctx->input->valid_len < mctx->input->len)) |
612546c6 UD |
2049 | { |
2050 | *err = extend_buffers (mctx); | |
2051 | if (BE (*err != REG_NOERROR, 0)) | |
15a7d175 | 2052 | return NULL; |
612546c6 UD |
2053 | } |
2054 | ||
a9388965 | 2055 | *err = REG_NOERROR; |
3b0bdc72 UD |
2056 | if (state == NULL) |
2057 | { | |
2058 | next_state = state; | |
612546c6 | 2059 | re_string_skip_bytes (mctx->input, 1); |
3b0bdc72 UD |
2060 | } |
2061 | else | |
2062 | { | |
434d3784 | 2063 | #ifdef RE_ENABLE_I18N |
3b0bdc72 UD |
2064 | /* If the current state can accept multibyte. */ |
2065 | if (state->accept_mb) | |
15a7d175 UD |
2066 | { |
2067 | *err = transit_state_mb (preg, state, mctx); | |
2068 | if (BE (*err != REG_NOERROR, 0)) | |
2069 | return NULL; | |
2070 | } | |
434d3784 | 2071 | #endif /* RE_ENABLE_I18N */ |
3b0bdc72 UD |
2072 | |
2073 | /* Then decide the next state with the single byte. */ | |
2074 | if (1) | |
15a7d175 UD |
2075 | { |
2076 | /* Use transition table */ | |
2077 | ch = re_string_fetch_byte (mctx->input); | |
2078 | trtable = fl_search ? state->trtable_search : state->trtable; | |
2079 | if (trtable == NULL) | |
2080 | { | |
2081 | trtable = build_trtable (preg, state, fl_search); | |
2082 | if (fl_search) | |
2083 | state->trtable_search = trtable; | |
2084 | else | |
2085 | state->trtable = trtable; | |
2086 | } | |
2087 | next_state = trtable[ch]; | |
2088 | } | |
3b0bdc72 | 2089 | else |
15a7d175 UD |
2090 | { |
2091 | /* don't use transition table */ | |
2092 | next_state = transit_state_sb (err, preg, state, fl_search, mctx); | |
2093 | if (BE (next_state == NULL && err != REG_NOERROR, 0)) | |
2094 | return NULL; | |
2095 | } | |
3b0bdc72 UD |
2096 | } |
2097 | ||
6291ee3c | 2098 | cur_idx = re_string_cur_idx (mctx->input); |
3b0bdc72 | 2099 | /* Update the state_log if we need. */ |
612546c6 | 2100 | if (mctx->state_log != NULL) |
3b0bdc72 | 2101 | { |
3b0bdc72 | 2102 | if (cur_idx > mctx->state_log_top) |
15a7d175 UD |
2103 | { |
2104 | mctx->state_log[cur_idx] = next_state; | |
2105 | mctx->state_log_top = cur_idx; | |
2106 | } | |
612546c6 | 2107 | else if (mctx->state_log[cur_idx] == 0) |
15a7d175 UD |
2108 | { |
2109 | mctx->state_log[cur_idx] = next_state; | |
2110 | } | |
3b0bdc72 | 2111 | else |
15a7d175 UD |
2112 | { |
2113 | re_dfastate_t *pstate; | |
2114 | unsigned int context; | |
2115 | re_node_set next_nodes, *log_nodes, *table_nodes = NULL; | |
2116 | /* If (state_log[cur_idx] != 0), it implies that cur_idx is | |
2117 | the destination of a multibyte char/collating element/ | |
2118 | back reference. Then the next state is the union set of | |
2119 | these destinations and the results of the transition table. */ | |
2120 | pstate = mctx->state_log[cur_idx]; | |
2121 | log_nodes = pstate->entrance_nodes; | |
2122 | if (next_state != NULL) | |
2123 | { | |
2124 | table_nodes = next_state->entrance_nodes; | |
2125 | *err = re_node_set_init_union (&next_nodes, table_nodes, | |
2126 | log_nodes); | |
2127 | if (BE (*err != REG_NOERROR, 0)) | |
2128 | return NULL; | |
2129 | } | |
2130 | else | |
2131 | next_nodes = *log_nodes; | |
2132 | /* Note: We already add the nodes of the initial state, | |
2133 | then we don't need to add them here. */ | |
2134 | ||
2135 | context = re_string_context_at (mctx->input, | |
2136 | re_string_cur_idx (mctx->input) - 1, | |
2137 | mctx->eflags, preg->newline_anchor); | |
2138 | next_state = mctx->state_log[cur_idx] | |
2139 | = re_acquire_state_context (err, dfa, &next_nodes, context); | |
2140 | /* We don't need to check errors here, since the return value of | |
2141 | this function is next_state and ERR is already set. */ | |
2142 | ||
2143 | if (table_nodes != NULL) | |
2144 | re_node_set_free (&next_nodes); | |
2145 | } | |
6291ee3c UD |
2146 | } |
2147 | ||
2148 | /* Check OP_OPEN_SUBEXP in the current state in case that we use them | |
2149 | later. We must check them here, since the back references in the | |
2150 | next state might use them. */ | |
2151 | if (dfa->nbackref && next_state/* && fl_process_bkref */) | |
2152 | { | |
2153 | *err = check_subexp_matching_top (dfa, mctx, &next_state->nodes, | |
2154 | cur_idx); | |
2155 | if (BE (*err != REG_NOERROR, 0)) | |
2156 | return NULL; | |
2157 | } | |
2158 | ||
2159 | /* If the next state has back references. */ | |
2160 | if (next_state != NULL && next_state->has_backref) | |
2161 | { | |
2162 | *err = transit_state_bkref (preg, &next_state->nodes, mctx); | |
2163 | if (BE (*err != REG_NOERROR, 0)) | |
2164 | return NULL; | |
2165 | next_state = mctx->state_log[cur_idx]; | |
3b0bdc72 UD |
2166 | } |
2167 | return next_state; | |
2168 | } | |
2169 | ||
2170 | /* Helper functions for transit_state. */ | |
2171 | ||
6291ee3c UD |
2172 | /* From the node set CUR_NODES, pick up the nodes whose types are |
2173 | OP_OPEN_SUBEXP and which have corresponding back references in the regular | |
2174 | expression. And register them to use them later for evaluating the | |
2175 | correspoding back references. */ | |
2176 | ||
2177 | static reg_errcode_t | |
2178 | check_subexp_matching_top (dfa, mctx, cur_nodes, str_idx) | |
2179 | re_dfa_t *dfa; | |
2180 | re_match_context_t *mctx; | |
2181 | re_node_set *cur_nodes; | |
2182 | int str_idx; | |
2183 | { | |
2184 | int node_idx; | |
2185 | reg_errcode_t err; | |
2186 | ||
2187 | /* TODO: This isn't efficient. | |
2188 | Because there might be more than one nodes whose types are | |
2189 | OP_OPEN_SUBEXP and whose index is SUBEXP_IDX, we must check all | |
2190 | nodes. | |
2191 | E.g. RE: (a){2} */ | |
2192 | for (node_idx = 0; node_idx < cur_nodes->nelem; ++node_idx) | |
2193 | { | |
2194 | int node = cur_nodes->elems[node_idx]; | |
2195 | if (dfa->nodes[node].type == OP_OPEN_SUBEXP | |
2196 | && dfa->used_bkref_map & (1 << dfa->nodes[node].opr.idx)) | |
2197 | { | |
2198 | err = match_ctx_add_subtop (mctx, node, str_idx); | |
2199 | if (BE (err != REG_NOERROR, 0)) | |
2200 | return err; | |
2201 | } | |
2202 | } | |
2203 | return REG_NOERROR; | |
2204 | } | |
2205 | ||
3b0bdc72 UD |
2206 | /* Return the next state to which the current state STATE will transit by |
2207 | accepting the current input byte. */ | |
2208 | ||
2209 | static re_dfastate_t * | |
612546c6 | 2210 | transit_state_sb (err, preg, state, fl_search, mctx) |
a9388965 UD |
2211 | reg_errcode_t *err; |
2212 | const regex_t *preg; | |
2213 | re_dfastate_t *state; | |
a9388965 UD |
2214 | int fl_search; |
2215 | re_match_context_t *mctx; | |
3b0bdc72 UD |
2216 | { |
2217 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; | |
2218 | re_node_set next_nodes; | |
2219 | re_dfastate_t *next_state; | |
612546c6 | 2220 | int node_cnt, cur_str_idx = re_string_cur_idx (mctx->input); |
3b0bdc72 UD |
2221 | unsigned int context; |
2222 | ||
a9388965 | 2223 | *err = re_node_set_alloc (&next_nodes, state->nodes.nelem + 1); |
bc15410e | 2224 | if (BE (*err != REG_NOERROR, 0)) |
a9388965 | 2225 | return NULL; |
3b0bdc72 UD |
2226 | for (node_cnt = 0; node_cnt < state->nodes.nelem; ++node_cnt) |
2227 | { | |
2228 | int cur_node = state->nodes.elems[node_cnt]; | |
612546c6 | 2229 | if (check_node_accept (preg, dfa->nodes + cur_node, mctx, cur_str_idx)) |
15a7d175 UD |
2230 | { |
2231 | *err = re_node_set_merge (&next_nodes, | |
2232 | dfa->eclosures + dfa->nexts[cur_node]); | |
2233 | if (BE (*err != REG_NOERROR, 0)) | |
2234 | { | |
2235 | re_node_set_free (&next_nodes); | |
2236 | return NULL; | |
2237 | } | |
2238 | } | |
3b0bdc72 UD |
2239 | } |
2240 | if (fl_search) | |
2241 | { | |
2242 | #ifdef RE_ENABLE_I18N | |
2243 | int not_initial = 0; | |
2244 | if (MB_CUR_MAX > 1) | |
15a7d175 UD |
2245 | for (node_cnt = 0; node_cnt < next_nodes.nelem; ++node_cnt) |
2246 | if (dfa->nodes[next_nodes.elems[node_cnt]].type == CHARACTER) | |
2247 | { | |
2248 | not_initial = dfa->nodes[next_nodes.elems[node_cnt]].mb_partial; | |
2249 | break; | |
2250 | } | |
3b0bdc72 UD |
2251 | if (!not_initial) |
2252 | #endif | |
15a7d175 UD |
2253 | { |
2254 | *err = re_node_set_merge (&next_nodes, | |
2255 | dfa->init_state->entrance_nodes); | |
2256 | if (BE (*err != REG_NOERROR, 0)) | |
2257 | { | |
2258 | re_node_set_free (&next_nodes); | |
2259 | return NULL; | |
2260 | } | |
2261 | } | |
3b0bdc72 | 2262 | } |
612546c6 | 2263 | context = re_string_context_at (mctx->input, cur_str_idx, mctx->eflags, |
15a7d175 | 2264 | preg->newline_anchor); |
a9388965 UD |
2265 | next_state = re_acquire_state_context (err, dfa, &next_nodes, context); |
2266 | /* We don't need to check errors here, since the return value of | |
2267 | this function is next_state and ERR is already set. */ | |
2268 | ||
3b0bdc72 | 2269 | re_node_set_free (&next_nodes); |
612546c6 | 2270 | re_string_skip_bytes (mctx->input, 1); |
3b0bdc72 UD |
2271 | return next_state; |
2272 | } | |
2273 | ||
434d3784 | 2274 | #ifdef RE_ENABLE_I18N |
a9388965 | 2275 | static reg_errcode_t |
612546c6 | 2276 | transit_state_mb (preg, pstate, mctx) |
3b0bdc72 | 2277 | const regex_t *preg; |
612546c6 | 2278 | re_dfastate_t *pstate; |
3b0bdc72 UD |
2279 | re_match_context_t *mctx; |
2280 | { | |
a9388965 | 2281 | reg_errcode_t err; |
3b0bdc72 UD |
2282 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; |
2283 | int i; | |
2284 | ||
2285 | for (i = 0; i < pstate->nodes.nelem; ++i) | |
2286 | { | |
2287 | re_node_set dest_nodes, *new_nodes; | |
2288 | int cur_node_idx = pstate->nodes.elems[i]; | |
2289 | int naccepted = 0, dest_idx; | |
2290 | unsigned int context; | |
2291 | re_dfastate_t *dest_state; | |
2292 | ||
485d775d | 2293 | if (dfa->nodes[cur_node_idx].constraint) |
15a7d175 UD |
2294 | { |
2295 | context = re_string_context_at (mctx->input, | |
2296 | re_string_cur_idx (mctx->input), | |
2297 | mctx->eflags, preg->newline_anchor); | |
2298 | if (NOT_SATISFY_NEXT_CONSTRAINT (dfa->nodes[cur_node_idx].constraint, | |
2299 | context)) | |
2300 | continue; | |
2301 | } | |
3b0bdc72 UD |
2302 | |
2303 | /* How many bytes the node can accepts? */ | |
2304 | if (ACCEPT_MB_NODE (dfa->nodes[cur_node_idx].type)) | |
15a7d175 UD |
2305 | naccepted = check_node_accept_bytes (preg, cur_node_idx, mctx->input, |
2306 | re_string_cur_idx (mctx->input)); | |
3b0bdc72 | 2307 | if (naccepted == 0) |
15a7d175 | 2308 | continue; |
3b0bdc72 UD |
2309 | |
2310 | /* The node can accepts `naccepted' bytes. */ | |
612546c6 | 2311 | dest_idx = re_string_cur_idx (mctx->input) + naccepted; |
0742e48e | 2312 | mctx->max_mb_elem_len = ((mctx->max_mb_elem_len < naccepted) ? naccepted |
15a7d175 | 2313 | : mctx->max_mb_elem_len); |
612546c6 UD |
2314 | err = clean_state_log_if_need (mctx, dest_idx); |
2315 | if (BE (err != REG_NOERROR, 0)) | |
15a7d175 | 2316 | return err; |
3b0bdc72 UD |
2317 | #ifdef DEBUG |
2318 | assert (dfa->nexts[cur_node_idx] != -1); | |
2319 | #endif | |
2320 | /* `cur_node_idx' may point the entity of the OP_CONTEXT_NODE, | |
15a7d175 | 2321 | then we use pstate->nodes.elems[i] instead. */ |
3b0bdc72 UD |
2322 | new_nodes = dfa->eclosures + dfa->nexts[pstate->nodes.elems[i]]; |
2323 | ||
612546c6 | 2324 | dest_state = mctx->state_log[dest_idx]; |
3b0bdc72 | 2325 | if (dest_state == NULL) |
15a7d175 | 2326 | dest_nodes = *new_nodes; |
3b0bdc72 | 2327 | else |
15a7d175 UD |
2328 | { |
2329 | err = re_node_set_init_union (&dest_nodes, | |
2330 | dest_state->entrance_nodes, new_nodes); | |
2331 | if (BE (err != REG_NOERROR, 0)) | |
2332 | return err; | |
2333 | } | |
612546c6 | 2334 | context = re_string_context_at (mctx->input, dest_idx - 1, mctx->eflags, |
15a7d175 | 2335 | preg->newline_anchor); |
612546c6 | 2336 | mctx->state_log[dest_idx] |
15a7d175 | 2337 | = re_acquire_state_context (&err, dfa, &dest_nodes, context); |
3b0bdc72 | 2338 | if (dest_state != NULL) |
15a7d175 | 2339 | re_node_set_free (&dest_nodes); |
1b2c2628 | 2340 | if (BE (mctx->state_log[dest_idx] == NULL && err != REG_NOERROR, 0)) |
15a7d175 | 2341 | return err; |
3b0bdc72 | 2342 | } |
a9388965 | 2343 | return REG_NOERROR; |
3b0bdc72 | 2344 | } |
434d3784 | 2345 | #endif /* RE_ENABLE_I18N */ |
3b0bdc72 | 2346 | |
a9388965 | 2347 | static reg_errcode_t |
6291ee3c | 2348 | transit_state_bkref (preg, nodes, mctx) |
3b0bdc72 | 2349 | const regex_t *preg; |
3b0bdc72 | 2350 | re_node_set *nodes; |
3b0bdc72 UD |
2351 | re_match_context_t *mctx; |
2352 | { | |
a9388965 | 2353 | reg_errcode_t err; |
3b0bdc72 | 2354 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; |
0742e48e | 2355 | int i; |
612546c6 | 2356 | int cur_str_idx = re_string_cur_idx (mctx->input); |
3b0bdc72 UD |
2357 | |
2358 | for (i = 0; i < nodes->nelem; ++i) | |
2359 | { | |
6291ee3c | 2360 | int dest_str_idx, prev_nelem, bkc_idx; |
3b0bdc72 UD |
2361 | int node_idx = nodes->elems[i]; |
2362 | unsigned int context; | |
2363 | re_token_t *node = dfa->nodes + node_idx; | |
3b0bdc72 UD |
2364 | re_node_set *new_dest_nodes; |
2365 | ||
2366 | /* Check whether `node' is a backreference or not. */ | |
6291ee3c | 2367 | if (node->type != OP_BACK_REF) |
15a7d175 | 2368 | continue; |
485d775d UD |
2369 | |
2370 | if (node->constraint) | |
15a7d175 UD |
2371 | { |
2372 | context = re_string_context_at (mctx->input, cur_str_idx, | |
2373 | mctx->eflags, preg->newline_anchor); | |
2374 | if (NOT_SATISFY_NEXT_CONSTRAINT (node->constraint, context)) | |
2375 | continue; | |
2376 | } | |
3b0bdc72 UD |
2377 | |
2378 | /* `node' is a backreference. | |
15a7d175 | 2379 | Check the substring which the substring matched. */ |
6291ee3c UD |
2380 | bkc_idx = mctx->nbkref_ents; |
2381 | err = get_subexp (preg, mctx, node_idx, cur_str_idx); | |
612546c6 | 2382 | if (BE (err != REG_NOERROR, 0)) |
15a7d175 | 2383 | goto free_return; |
3b0bdc72 UD |
2384 | |
2385 | /* And add the epsilon closures (which is `new_dest_nodes') of | |
15a7d175 | 2386 | the backreference to appropriate state_log. */ |
3b0bdc72 UD |
2387 | #ifdef DEBUG |
2388 | assert (dfa->nexts[node_idx] != -1); | |
2389 | #endif | |
6291ee3c | 2390 | for (; bkc_idx < mctx->nbkref_ents; ++bkc_idx) |
15a7d175 UD |
2391 | { |
2392 | int subexp_len; | |
2393 | re_dfastate_t *dest_state; | |
2394 | struct re_backref_cache_entry *bkref_ent; | |
2395 | bkref_ent = mctx->bkref_ents + bkc_idx; | |
2396 | if (bkref_ent->node != node_idx || bkref_ent->str_idx != cur_str_idx) | |
2397 | continue; | |
2398 | subexp_len = bkref_ent->subexp_to - bkref_ent->subexp_from; | |
2399 | new_dest_nodes = (subexp_len == 0 | |
2400 | ? dfa->eclosures + dfa->edests[node_idx].elems[0] | |
2401 | : dfa->eclosures + dfa->nexts[node_idx]); | |
2402 | dest_str_idx = (cur_str_idx + bkref_ent->subexp_to | |
2403 | - bkref_ent->subexp_from); | |
6291ee3c UD |
2404 | context = re_string_context_at (mctx->input, dest_str_idx - 1, |
2405 | mctx->eflags, preg->newline_anchor); | |
15a7d175 UD |
2406 | dest_state = mctx->state_log[dest_str_idx]; |
2407 | prev_nelem = ((mctx->state_log[cur_str_idx] == NULL) ? 0 | |
2408 | : mctx->state_log[cur_str_idx]->nodes.nelem); | |
2409 | /* Add `new_dest_node' to state_log. */ | |
2410 | if (dest_state == NULL) | |
2411 | { | |
2412 | mctx->state_log[dest_str_idx] | |
2413 | = re_acquire_state_context (&err, dfa, new_dest_nodes, | |
2414 | context); | |
2415 | if (BE (mctx->state_log[dest_str_idx] == NULL | |
2416 | && err != REG_NOERROR, 0)) | |
2417 | goto free_return; | |
2418 | } | |
2419 | else | |
2420 | { | |
2421 | re_node_set dest_nodes; | |
2422 | err = re_node_set_init_union (&dest_nodes, | |
2423 | dest_state->entrance_nodes, | |
2424 | new_dest_nodes); | |
2425 | if (BE (err != REG_NOERROR, 0)) | |
2426 | { | |
2427 | re_node_set_free (&dest_nodes); | |
2428 | goto free_return; | |
2429 | } | |
2430 | mctx->state_log[dest_str_idx] | |
2431 | = re_acquire_state_context (&err, dfa, &dest_nodes, context); | |
2432 | re_node_set_free (&dest_nodes); | |
2433 | if (BE (mctx->state_log[dest_str_idx] == NULL | |
2434 | && err != REG_NOERROR, 0)) | |
2435 | goto free_return; | |
2436 | } | |
2437 | /* We need to check recursively if the backreference can epsilon | |
2438 | transit. */ | |
2439 | if (subexp_len == 0 | |
2440 | && mctx->state_log[cur_str_idx]->nodes.nelem > prev_nelem) | |
2441 | { | |
6291ee3c UD |
2442 | err = check_subexp_matching_top (dfa, mctx, new_dest_nodes, |
2443 | cur_str_idx); | |
2444 | if (BE (err != REG_NOERROR, 0)) | |
2445 | goto free_return; | |
2446 | err = transit_state_bkref (preg, new_dest_nodes, mctx); | |
15a7d175 UD |
2447 | if (BE (err != REG_NOERROR, 0)) |
2448 | goto free_return; | |
2449 | } | |
2450 | } | |
3b0bdc72 | 2451 | } |
1b2c2628 UD |
2452 | err = REG_NOERROR; |
2453 | free_return: | |
1b2c2628 | 2454 | return err; |
3b0bdc72 UD |
2455 | } |
2456 | ||
6291ee3c UD |
2457 | /* Enumerate all the candidates which the backreference BKREF_NODE can match |
2458 | at BKREF_STR_IDX, and register them by match_ctx_add_entry(). | |
2459 | Note that we might collect inappropriate candidates here. | |
2460 | However, the cost of checking them strictly here is too high, then we | |
2461 | delay these checking for prune_impossible_nodes(). */ | |
3b0bdc72 | 2462 | |
6291ee3c UD |
2463 | static reg_errcode_t |
2464 | get_subexp (preg, mctx, bkref_node, bkref_str_idx) | |
2465 | const regex_t *preg; | |
2466 | re_match_context_t *mctx; | |
2467 | int bkref_node, bkref_str_idx; | |
3b0bdc72 | 2468 | { |
6291ee3c | 2469 | int subexp_num, sub_top_idx; |
3b0bdc72 | 2470 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; |
85c54a32 | 2471 | char *buf = (char *) re_string_get_buffer (mctx->input); |
6291ee3c UD |
2472 | /* Return if we have already checked BKREF_NODE at BKREF_STR_IDX. */ |
2473 | int cache_idx = search_cur_bkref_entry (mctx, bkref_str_idx); | |
2474 | for (; cache_idx < mctx->nbkref_ents; ++cache_idx) | |
2475 | { | |
2476 | struct re_backref_cache_entry *entry = mctx->bkref_ents + cache_idx; | |
2477 | if (entry->str_idx > bkref_str_idx) | |
2478 | break; | |
2479 | if (entry->node == bkref_node) | |
2480 | return REG_NOERROR; /* We already checked it. */ | |
2481 | } | |
2482 | subexp_num = dfa->nodes[bkref_node].opr.idx - 1; | |
2483 | ||
2484 | /* For each sub expression */ | |
2485 | for (sub_top_idx = 0; sub_top_idx < mctx->nsub_tops; ++sub_top_idx) | |
2486 | { | |
2487 | reg_errcode_t err; | |
2488 | re_sub_match_top_t *sub_top = mctx->sub_tops[sub_top_idx]; | |
2489 | re_sub_match_last_t *sub_last; | |
2490 | int sub_last_idx, sl_str; | |
2491 | char *bkref_str; | |
2492 | ||
2493 | if (dfa->nodes[sub_top->node].opr.idx != subexp_num) | |
2494 | continue; /* It isn't related. */ | |
2495 | ||
2496 | sl_str = sub_top->str_idx; | |
2497 | bkref_str = buf + bkref_str_idx; | |
2498 | /* At first, check the last node of sub expressions we already | |
2499 | evaluated. */ | |
2500 | for (sub_last_idx = 0; sub_last_idx < sub_top->nlasts; ++sub_last_idx) | |
2501 | { | |
2502 | int sl_str_diff; | |
2503 | sub_last = sub_top->lasts[sub_last_idx]; | |
2504 | sl_str_diff = sub_last->str_idx - sl_str; | |
2505 | /* The matched string by the sub expression match with the substring | |
2506 | at the back reference? */ | |
2507 | if (sl_str_diff > 0 | |
2508 | && memcmp (bkref_str, buf + sl_str, sl_str_diff) != 0) | |
2509 | break; /* We don't need to search this sub expression any more. */ | |
2510 | bkref_str += sl_str_diff; | |
2511 | sl_str += sl_str_diff; | |
2512 | err = get_subexp_sub (preg, mctx, sub_top, sub_last, bkref_node, | |
2513 | bkref_str_idx); | |
2514 | if (err == REG_NOMATCH) | |
2515 | continue; | |
2516 | if (BE (err != REG_NOERROR, 0)) | |
2517 | return err; | |
2518 | } | |
2519 | if (sub_last_idx < sub_top->nlasts) | |
2520 | continue; | |
2521 | if (sub_last_idx > 0) | |
2522 | ++sl_str; | |
2523 | /* Then, search for the other last nodes of the sub expression. */ | |
2524 | for (; sl_str <= bkref_str_idx; ++sl_str) | |
2525 | { | |
2526 | int cls_node, sl_str_off; | |
2527 | re_node_set *nodes; | |
2528 | sl_str_off = sl_str - sub_top->str_idx; | |
2529 | /* The matched string by the sub expression match with the substring | |
2530 | at the back reference? */ | |
2531 | if (sl_str_off > 0 | |
2532 | && memcmp (bkref_str++, buf + sl_str - 1, 1) != 0) | |
2533 | break; /* We don't need to search this sub expression any more. */ | |
2534 | if (mctx->state_log[sl_str] == NULL) | |
2535 | continue; | |
2536 | /* Does this state have a ')' of the sub expression? */ | |
2537 | nodes = &mctx->state_log[sl_str]->nodes; | |
2538 | cls_node = find_subexp_node (dfa, nodes, subexp_num, 0); | |
2539 | if (cls_node == -1) | |
2540 | continue; /* No. */ | |
2541 | if (sub_top->path == NULL) | |
2542 | { | |
2543 | sub_top->path = calloc (sizeof (state_array_t), | |
2544 | sl_str - sub_top->str_idx + 1); | |
2545 | if (sub_top->path == NULL) | |
2546 | return REG_ESPACE; | |
2547 | } | |
2548 | /* Can the OP_OPEN_SUBEXP node arrive the OP_CLOSE_SUBEXP node | |
2549 | in the current context? */ | |
2550 | err = check_arrival (preg, mctx, sub_top->path, sub_top->node, | |
2551 | sub_top->str_idx, cls_node, sl_str, 0); | |
2552 | if (err == REG_NOMATCH) | |
2553 | continue; | |
2554 | if (BE (err != REG_NOERROR, 0)) | |
2555 | return err; | |
2556 | sub_last = match_ctx_add_sublast (sub_top, cls_node, sl_str); | |
2557 | if (BE (sub_last == NULL, 0)) | |
2558 | return REG_ESPACE; | |
2559 | err = get_subexp_sub (preg, mctx, sub_top, sub_last, bkref_node, | |
2560 | bkref_str_idx); | |
2561 | if (err == REG_NOMATCH) | |
2562 | continue; | |
2563 | } | |
2564 | } | |
2565 | return REG_NOERROR; | |
2566 | } | |
2567 | ||
2568 | /* Helper functions for get_subexp(). */ | |
2569 | ||
2570 | /* Check SUB_LAST can arrive to the back reference BKREF_NODE at BKREF_STR. | |
2571 | If it can arrive, register the sub expression expressed with SUB_TOP | |
2572 | and SUB_LAST. */ | |
2573 | ||
2574 | static reg_errcode_t | |
2575 | get_subexp_sub (preg, mctx, sub_top, sub_last, bkref_node, bkref_str) | |
2576 | const regex_t *preg; | |
2577 | re_match_context_t *mctx; | |
2578 | re_sub_match_top_t *sub_top; | |
2579 | re_sub_match_last_t *sub_last; | |
2580 | int bkref_node, bkref_str; | |
2581 | { | |
2582 | reg_errcode_t err; | |
2583 | int to_idx; | |
2584 | /* Can the subexpression arrive the back reference? */ | |
2585 | err = check_arrival (preg, mctx, &sub_last->path, sub_last->node, | |
2586 | sub_last->str_idx, bkref_node, bkref_str, 1); | |
2587 | if (err != REG_NOERROR) | |
2588 | return err; | |
2589 | err = match_ctx_add_entry (mctx, bkref_node, bkref_str, sub_top->str_idx, | |
2590 | sub_last->str_idx); | |
2591 | if (BE (err != REG_NOERROR, 0)) | |
2592 | return err; | |
2593 | to_idx = bkref_str + sub_last->str_idx - sub_top->str_idx; | |
2594 | clean_state_log_if_need (mctx, to_idx); | |
2595 | return REG_NOERROR; | |
2596 | } | |
2597 | ||
2598 | /* Find the first node which is '(' or ')' and whose index is SUBEXP_IDX. | |
2599 | Search '(' if FL_OPEN, or search ')' otherwise. | |
2600 | TODO: This function isn't efficient... | |
2601 | Because there might be more than one nodes whose types are | |
2602 | OP_OPEN_SUBEXP and whose index is SUBEXP_IDX, we must check all | |
2603 | nodes. | |
2604 | E.g. RE: (a){2} */ | |
2605 | ||
2606 | static int | |
2607 | find_subexp_node (dfa, nodes, subexp_idx, fl_open) | |
2608 | re_dfa_t *dfa; | |
2609 | re_node_set *nodes; | |
2610 | int subexp_idx, fl_open; | |
2611 | { | |
2612 | int cls_idx; | |
2613 | for (cls_idx = 0; cls_idx < nodes->nelem; ++cls_idx) | |
2614 | { | |
2615 | int cls_node = nodes->elems[cls_idx]; | |
2616 | re_token_t *node = dfa->nodes + cls_node; | |
2617 | if (((fl_open && node->type == OP_OPEN_SUBEXP) | |
2618 | || (!fl_open && node->type == OP_CLOSE_SUBEXP)) | |
2619 | && node->opr.idx == subexp_idx) | |
2620 | return cls_node; | |
2621 | } | |
2622 | return -1; | |
2623 | } | |
2624 | ||
2625 | /* Check whether the node TOP_NODE at TOP_STR can arrive to the node | |
2626 | LAST_NODE at LAST_STR. We record the path onto PATH since it will be | |
2627 | heavily reused. | |
2628 | Return REG_NOERROR if it can arrive, or REG_NOMATCH otherwise. */ | |
2629 | ||
2630 | static reg_errcode_t | |
2631 | check_arrival (preg, mctx, path, top_node, top_str, last_node, last_str, | |
2632 | fl_open) | |
2633 | const regex_t *preg; | |
2634 | re_match_context_t *mctx; | |
2635 | state_array_t *path; | |
2636 | int top_node, top_str, last_node, last_str, fl_open; | |
2637 | { | |
2638 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; | |
2639 | reg_errcode_t err; | |
2640 | int subexp_num, backup_cur_idx, str_idx, null_cnt; | |
2641 | re_dfastate_t *cur_state = NULL; | |
2642 | re_node_set *cur_nodes, next_nodes; | |
2643 | re_dfastate_t **backup_state_log; | |
2644 | unsigned int context; | |
2645 | ||
2646 | subexp_num = dfa->nodes[top_node].opr.idx; | |
2647 | /* Extend the buffer if we need. */ | |
2648 | if (path->alloc < last_str + mctx->max_mb_elem_len + 1) | |
2649 | { | |
2650 | re_dfastate_t **new_array; | |
2651 | int old_alloc = path->alloc; | |
2652 | path->alloc += last_str + mctx->max_mb_elem_len + 1; | |
2653 | new_array = re_realloc (path->array, re_dfastate_t *, path->alloc); | |
2654 | if (new_array == NULL) | |
2655 | return REG_ESPACE; | |
2656 | path->array = new_array; | |
2657 | memset (new_array + old_alloc, '\0', | |
2658 | sizeof (re_dfastate_t *) * (path->alloc - old_alloc)); | |
2659 | } | |
2660 | ||
2661 | str_idx = path->next_idx == 0 ? top_str : path->next_idx; | |
2662 | ||
2663 | /* Temporary modify MCTX. */ | |
2664 | backup_state_log = mctx->state_log; | |
2665 | backup_cur_idx = mctx->input->cur_idx; | |
2666 | mctx->state_log = path->array; | |
2667 | mctx->input->cur_idx = str_idx; | |
2668 | ||
2669 | /* Setup initial node set. */ | |
2670 | context = re_string_context_at (mctx->input, str_idx - 1, mctx->eflags, | |
2671 | preg->newline_anchor); | |
2672 | if (str_idx == top_str) | |
2673 | { | |
2674 | err = re_node_set_init_1 (&next_nodes, top_node); | |
2675 | if (BE (err != REG_NOERROR, 0)) | |
2676 | return err; | |
2677 | err = check_arrival_expand_ecl (dfa, &next_nodes, subexp_num, fl_open); | |
2678 | if (BE (err != REG_NOERROR, 0)) | |
2679 | { | |
2680 | re_node_set_free (&next_nodes); | |
2681 | return err; | |
2682 | } | |
2683 | } | |
2684 | else | |
2685 | { | |
2686 | cur_state = mctx->state_log[str_idx]; | |
2687 | if (cur_state && cur_state->has_backref) | |
2688 | { | |
2689 | err = re_node_set_init_copy (&next_nodes, &cur_state->nodes); | |
2690 | if (BE ( err != REG_NOERROR, 0)) | |
2691 | return err; | |
2692 | } | |
2693 | else | |
2694 | re_node_set_init_empty (&next_nodes); | |
2695 | } | |
2696 | if (str_idx == top_str || (cur_state && cur_state->has_backref)) | |
2697 | { | |
2698 | if (next_nodes.nelem) | |
2699 | { | |
2700 | err = expand_bkref_cache (preg, mctx, &next_nodes, str_idx, last_str, | |
2701 | subexp_num, fl_open); | |
2702 | if (BE ( err != REG_NOERROR, 0)) | |
2703 | { | |
2704 | re_node_set_free (&next_nodes); | |
2705 | return err; | |
2706 | } | |
2707 | } | |
2708 | cur_state = re_acquire_state_context (&err, dfa, &next_nodes, context); | |
2709 | if (BE (cur_state == NULL && err != REG_NOERROR, 0)) | |
2710 | { | |
2711 | re_node_set_free (&next_nodes); | |
2712 | return err; | |
2713 | } | |
2714 | mctx->state_log[str_idx] = cur_state; | |
2715 | } | |
2716 | ||
2717 | for (null_cnt = 0; str_idx < last_str && null_cnt <= mctx->max_mb_elem_len;) | |
2718 | { | |
2719 | re_node_set_empty (&next_nodes); | |
2720 | if (mctx->state_log[str_idx + 1]) | |
2721 | { | |
2722 | err = re_node_set_merge (&next_nodes, | |
2723 | &mctx->state_log[str_idx + 1]->nodes); | |
2724 | if (BE (err != REG_NOERROR, 0)) | |
2725 | { | |
2726 | re_node_set_free (&next_nodes); | |
2727 | return err; | |
2728 | } | |
2729 | } | |
2730 | if (cur_state) | |
2731 | { | |
2732 | err = check_arrival_add_next_nodes(preg, dfa, mctx, str_idx, | |
2733 | &cur_state->nodes, &next_nodes); | |
2734 | if (BE (err != REG_NOERROR, 0)) | |
2735 | { | |
2736 | re_node_set_free (&next_nodes); | |
2737 | return err; | |
2738 | } | |
2739 | } | |
2740 | ++str_idx; | |
2741 | if (next_nodes.nelem) | |
2742 | { | |
2743 | err = check_arrival_expand_ecl (dfa, &next_nodes, subexp_num, | |
2744 | fl_open); | |
2745 | if (BE (err != REG_NOERROR, 0)) | |
2746 | { | |
2747 | re_node_set_free (&next_nodes); | |
2748 | return err; | |
2749 | } | |
2750 | err = expand_bkref_cache (preg, mctx, &next_nodes, str_idx, last_str, | |
2751 | subexp_num, fl_open); | |
2752 | if (BE ( err != REG_NOERROR, 0)) | |
2753 | { | |
2754 | re_node_set_free (&next_nodes); | |
2755 | return err; | |
2756 | } | |
2757 | } | |
2758 | context = re_string_context_at (mctx->input, str_idx - 1, mctx->eflags, | |
2759 | preg->newline_anchor); | |
2760 | cur_state = re_acquire_state_context (&err, dfa, &next_nodes, context); | |
2761 | if (BE (cur_state == NULL && err != REG_NOERROR, 0)) | |
2762 | { | |
2763 | re_node_set_free (&next_nodes); | |
2764 | return err; | |
2765 | } | |
2766 | mctx->state_log[str_idx] = cur_state; | |
2767 | null_cnt = cur_state == NULL ? null_cnt + 1 : 0; | |
2768 | } | |
2769 | re_node_set_free (&next_nodes); | |
2770 | cur_nodes = (mctx->state_log[last_str] == NULL ? NULL | |
2771 | : &mctx->state_log[last_str]->nodes); | |
2772 | path->next_idx = str_idx; | |
2773 | ||
2774 | /* Fix MCTX. */ | |
2775 | mctx->state_log = backup_state_log; | |
2776 | mctx->input->cur_idx = backup_cur_idx; | |
2777 | ||
2778 | if (cur_nodes == NULL) | |
2779 | return REG_NOMATCH; | |
2780 | /* Then check the current node set has the node LAST_NODE. */ | |
2781 | return (re_node_set_contains (cur_nodes, last_node) | |
2782 | || re_node_set_contains (cur_nodes, last_node) ? REG_NOERROR | |
2783 | : REG_NOMATCH); | |
2784 | } | |
2785 | ||
2786 | /* Helper functions for check_arrival. */ | |
2787 | ||
2788 | /* Calculate the destination nodes of CUR_NODES at STR_IDX, and append them | |
2789 | to NEXT_NODES. | |
2790 | TODO: This function is similar to the functions transit_state*(), | |
2791 | however this function has many additional works. | |
2792 | Can't we unify them? */ | |
2793 | ||
2794 | static reg_errcode_t | |
2795 | check_arrival_add_next_nodes (preg, dfa, mctx, str_idx, cur_nodes, next_nodes) | |
2796 | const regex_t *preg; | |
2797 | re_dfa_t *dfa; | |
2798 | re_match_context_t *mctx; | |
2799 | int str_idx; | |
2800 | re_node_set *cur_nodes, *next_nodes; | |
2801 | { | |
2802 | int cur_idx; | |
2803 | reg_errcode_t err; | |
2804 | re_node_set union_set; | |
2805 | re_node_set_init_empty (&union_set); | |
2806 | for (cur_idx = 0; cur_idx < cur_nodes->nelem; ++cur_idx) | |
2807 | { | |
2808 | int naccepted = 0; | |
2809 | int cur_node = cur_nodes->elems[cur_idx]; | |
2810 | re_token_type_t type = dfa->nodes[cur_node].type; | |
2811 | if (IS_EPSILON_NODE(type)) | |
2812 | continue; | |
2813 | #ifdef RE_ENABLE_I18N | |
2814 | /* If the node may accept `multi byte'. */ | |
2815 | if (ACCEPT_MB_NODE (type)) | |
2816 | { | |
2817 | naccepted = check_node_accept_bytes (preg, cur_node, mctx->input, | |
2818 | str_idx); | |
2819 | if (naccepted > 1) | |
2820 | { | |
2821 | re_dfastate_t *dest_state; | |
2822 | int next_node = dfa->nexts[cur_node]; | |
2823 | int next_idx = str_idx + naccepted; | |
2824 | dest_state = mctx->state_log[next_idx]; | |
2825 | re_node_set_empty (&union_set); | |
2826 | if (dest_state) | |
2827 | { | |
2828 | err = re_node_set_merge (&union_set, &dest_state->nodes); | |
2829 | if (BE (err != REG_NOERROR, 0)) | |
2830 | { | |
2831 | re_node_set_free (&union_set); | |
2832 | return err; | |
2833 | } | |
2834 | err = re_node_set_insert (&union_set, next_node); | |
2835 | if (BE (err < 0, 0)) | |
2836 | { | |
2837 | re_node_set_free (&union_set); | |
2838 | return REG_ESPACE; | |
2839 | } | |
2840 | } | |
2841 | else | |
2842 | { | |
2843 | err = re_node_set_insert (&union_set, next_node); | |
2844 | if (BE (err < 0, 0)) | |
2845 | { | |
2846 | re_node_set_free (&union_set); | |
2847 | return REG_ESPACE; | |
2848 | } | |
2849 | } | |
2850 | mctx->state_log[next_idx] = re_acquire_state (&err, dfa, | |
2851 | &union_set); | |
2852 | if (BE (mctx->state_log[next_idx] == NULL | |
2853 | && err != REG_NOERROR, 0)) | |
2854 | { | |
2855 | re_node_set_free (&union_set); | |
2856 | return err; | |
2857 | } | |
2858 | } | |
2859 | } | |
2860 | #endif /* RE_ENABLE_I18N */ | |
2861 | if (naccepted | |
2862 | || check_node_accept (preg, dfa->nodes + cur_node, mctx, | |
2863 | str_idx)) | |
2864 | { | |
2865 | err = re_node_set_insert (next_nodes, dfa->nexts[cur_node]); | |
2866 | if (BE (err < 0, 0)) | |
2867 | { | |
2868 | re_node_set_free (&union_set); | |
2869 | return REG_ESPACE; | |
2870 | } | |
2871 | } | |
2872 | } | |
2873 | re_node_set_free (&union_set); | |
2874 | return REG_NOERROR; | |
2875 | } | |
2876 | ||
2877 | /* For all the nodes in CUR_NODES, add the epsilon closures of them to | |
2878 | CUR_NODES, however exclude the nodes which are: | |
2879 | - inside the sub expression whose number is EX_SUBEXP, if FL_OPEN. | |
2880 | - out of the sub expression whose number is EX_SUBEXP, if !FL_OPEN. | |
2881 | */ | |
2882 | ||
2883 | static reg_errcode_t | |
2884 | check_arrival_expand_ecl (dfa, cur_nodes, ex_subexp, fl_open) | |
2885 | re_dfa_t *dfa; | |
2886 | re_node_set *cur_nodes; | |
2887 | int ex_subexp, fl_open; | |
2888 | { | |
2889 | reg_errcode_t err; | |
2890 | int idx, outside_node; | |
2891 | re_node_set new_nodes; | |
2892 | #ifdef DEBUG | |
2893 | assert (cur_nodes->nelem); | |
2894 | #endif | |
2895 | err = re_node_set_alloc (&new_nodes, cur_nodes->nelem); | |
2896 | if (BE (err != REG_NOERROR, 0)) | |
2897 | return err; | |
2898 | /* Create a new node set NEW_NODES with the nodes which are epsilon | |
2899 | closures of the node in CUR_NODES. */ | |
2900 | ||
2901 | for (idx = 0; idx < cur_nodes->nelem; ++idx) | |
2902 | { | |
2903 | int cur_node = cur_nodes->elems[idx]; | |
2904 | re_node_set *eclosure = dfa->eclosures + cur_node; | |
2905 | outside_node = find_subexp_node (dfa, eclosure, ex_subexp, fl_open); | |
2906 | if (outside_node == -1) | |
2907 | { | |
2908 | /* There are no problematic nodes, just merge them. */ | |
2909 | err = re_node_set_merge (&new_nodes, eclosure); | |
2910 | if (BE (err != REG_NOERROR, 0)) | |
2911 | { | |
2912 | re_node_set_free (&new_nodes); | |
2913 | return err; | |
2914 | } | |
2915 | } | |
2916 | else | |
2917 | { | |
2918 | /* There are problematic nodes, re-calculate incrementally. */ | |
2919 | err = check_arrival_expand_ecl_sub (dfa, &new_nodes, cur_node, | |
2920 | ex_subexp, fl_open); | |
2921 | if (BE (err != REG_NOERROR, 0)) | |
2922 | { | |
2923 | re_node_set_free (&new_nodes); | |
2924 | return err; | |
2925 | } | |
2926 | } | |
2927 | } | |
2928 | re_node_set_free (cur_nodes); | |
2929 | *cur_nodes = new_nodes; | |
2930 | return REG_NOERROR; | |
2931 | } | |
2932 | ||
2933 | /* Helper function for check_arrival_expand_ecl. | |
2934 | Check incrementally the epsilon closure of TARGET, and if it isn't | |
2935 | problematic append it to DST_NODES. */ | |
2936 | ||
2937 | static reg_errcode_t | |
2938 | check_arrival_expand_ecl_sub (dfa, dst_nodes, target, ex_subexp, fl_open) | |
2939 | re_dfa_t *dfa; | |
2940 | int target, ex_subexp, fl_open; | |
2941 | re_node_set *dst_nodes; | |
2942 | { | |
2943 | int cur_node, type; | |
2944 | for (cur_node = target; !re_node_set_contains (dst_nodes, cur_node);) | |
2945 | { | |
2946 | int err; | |
2947 | type = dfa->nodes[cur_node].type; | |
2948 | ||
2949 | if (((type == OP_OPEN_SUBEXP && fl_open) | |
2950 | || (type == OP_CLOSE_SUBEXP && !fl_open)) | |
2951 | && dfa->nodes[cur_node].opr.idx == ex_subexp) | |
2952 | { | |
2953 | if (!fl_open) | |
2954 | { | |
2955 | err = re_node_set_insert (dst_nodes, cur_node); | |
2956 | if (BE (err == -1, 0)) | |
2957 | return REG_ESPACE; | |
2958 | } | |
2959 | break; | |
2960 | } | |
2961 | err = re_node_set_insert (dst_nodes, cur_node); | |
2962 | if (BE (err == -1, 0)) | |
2963 | return REG_ESPACE; | |
2964 | if (dfa->edests[cur_node].nelem == 0) | |
2965 | break; | |
2966 | if (dfa->edests[cur_node].nelem == 2) | |
2967 | { | |
2968 | err = check_arrival_expand_ecl_sub (dfa, dst_nodes, | |
2969 | dfa->edests[cur_node].elems[1], | |
2970 | ex_subexp, fl_open); | |
2971 | if (BE (err != REG_NOERROR, 0)) | |
2972 | return err; | |
2973 | } | |
2974 | cur_node = dfa->edests[cur_node].elems[0]; | |
2975 | } | |
2976 | return REG_NOERROR; | |
2977 | } | |
2978 | ||
2979 | ||
2980 | /* For all the back references in the current state, calculate the | |
2981 | destination of the back references by the appropriate entry | |
2982 | in MCTX->BKREF_ENTS. */ | |
2983 | ||
2984 | static reg_errcode_t | |
2985 | expand_bkref_cache (preg, mctx, cur_nodes, cur_str, last_str, subexp_num, | |
2986 | fl_open) | |
2987 | const regex_t *preg; | |
2988 | re_match_context_t *mctx; | |
2989 | int cur_str, last_str, subexp_num, fl_open; | |
2990 | re_node_set *cur_nodes; | |
2991 | { | |
2992 | reg_errcode_t err; | |
2993 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; | |
2994 | int cache_idx, cache_idx_start; | |
2995 | /* The current state. */ | |
2996 | ||
2997 | cache_idx_start = search_cur_bkref_entry (mctx, cur_str); | |
2998 | for (cache_idx = cache_idx_start; cache_idx < mctx->nbkref_ents; ++cache_idx) | |
2999 | { | |
3000 | int to_idx, next_node; | |
3001 | struct re_backref_cache_entry *ent = mctx->bkref_ents + cache_idx; | |
3002 | if (ent->str_idx > cur_str) | |
3003 | break; | |
3004 | /* Is this entry ENT is appropriate? */ | |
3005 | if (!re_node_set_contains (cur_nodes, ent->node)) | |
3006 | continue; /* No. */ | |
3007 | ||
3008 | to_idx = cur_str + ent->subexp_to - ent->subexp_from; | |
3009 | /* Calculate the destination of the back reference, and append it | |
3010 | to MCTX->STATE_LOG. */ | |
3011 | if (to_idx == cur_str) | |
3012 | { | |
3013 | /* The backreference did epsilon transit, we must re-check all the | |
3014 | node in the current state. */ | |
3015 | re_node_set new_dests; | |
3016 | reg_errcode_t err2, err3; | |
3017 | next_node = dfa->edests[ent->node].elems[0]; | |
3018 | if (re_node_set_contains (cur_nodes, next_node)) | |
3019 | continue; | |
3020 | err = re_node_set_init_1 (&new_dests, next_node); | |
3021 | err2 = check_arrival_expand_ecl (dfa, &new_dests, subexp_num, | |
3022 | fl_open); | |
3023 | err3 = re_node_set_merge (cur_nodes, &new_dests); | |
3024 | re_node_set_free (&new_dests); | |
3025 | if (BE (err != REG_NOERROR || err2 != REG_NOERROR | |
3026 | || err3 != REG_NOERROR, 0)) | |
3027 | { | |
3028 | err = (err != REG_NOERROR ? err | |
3029 | : (err2 != REG_NOERROR ? err2 : err3)); | |
3030 | return err; | |
3031 | } | |
3032 | /* TODO: It is still inefficient... */ | |
3033 | cache_idx = cache_idx_start - 1; | |
3034 | continue; | |
3035 | } | |
3036 | else | |
3037 | { | |
3038 | re_node_set union_set; | |
3039 | next_node = dfa->nexts[ent->node]; | |
3040 | if (mctx->state_log[to_idx]) | |
3041 | { | |
3042 | int ret; | |
3043 | if (re_node_set_contains (&mctx->state_log[to_idx]->nodes, | |
3044 | next_node)) | |
3045 | continue; | |
3046 | err = re_node_set_init_copy (&union_set, | |
3047 | &mctx->state_log[to_idx]->nodes); | |
3048 | ret = re_node_set_insert (&union_set, next_node); | |
3049 | if (BE (err != REG_NOERROR || ret < 0, 0)) | |
3050 | { | |
3051 | re_node_set_free (&union_set); | |
3052 | err = err != REG_NOERROR ? err : REG_ESPACE; | |
3053 | return err; | |
3054 | } | |
3055 | } | |
3056 | else | |
3057 | { | |
3058 | err = re_node_set_init_1 (&union_set, next_node); | |
3059 | if (BE (err != REG_NOERROR, 0)) | |
3060 | return err; | |
3061 | } | |
3062 | mctx->state_log[to_idx] = re_acquire_state (&err, dfa, &union_set); | |
3063 | re_node_set_free (&union_set); | |
3064 | if (BE (mctx->state_log[to_idx] == NULL | |
3065 | && err != REG_NOERROR, 0)) | |
3066 | return err; | |
3067 | } | |
3068 | } | |
3069 | return REG_NOERROR; | |
3070 | } | |
3071 | ||
3072 | /* Build transition table for the state. | |
3073 | Return the new table if succeeded, otherwise return NULL. */ | |
3074 | ||
3075 | static re_dfastate_t ** | |
3076 | build_trtable (preg, state, fl_search) | |
3077 | const regex_t *preg; | |
3078 | const re_dfastate_t *state; | |
3079 | int fl_search; | |
3080 | { | |
3081 | reg_errcode_t err; | |
3082 | re_dfa_t *dfa = (re_dfa_t *) preg->buffer; | |
3083 | int i, j, k, ch; | |
3084 | int dests_node_malloced = 0, dest_states_malloced = 0; | |
3085 | int ndests; /* Number of the destination states from `state'. */ | |
3086 | re_dfastate_t **trtable; | |
3087 | re_dfastate_t **dest_states = NULL, **dest_states_word, **dest_states_nl; | |
3088 | re_node_set follows, *dests_node; | |
3089 | bitset *dests_ch; | |
3090 | bitset acceptable; | |
3b0bdc72 UD |
3091 | |
3092 | /* We build DFA states which corresponds to the destination nodes | |
3093 | from `state'. `dests_node[i]' represents the nodes which i-th | |
3094 | destination state contains, and `dests_ch[i]' represents the | |
3095 | characters which i-th destination state accepts. */ | |
05dab910 RM |
3096 | #ifdef _LIBC |
3097 | if (__libc_use_alloca ((sizeof (re_node_set) + sizeof (bitset)) * SBC_MAX)) | |
3098 | dests_node = (re_node_set *) | |
3099 | alloca ((sizeof (re_node_set) + sizeof (bitset)) * SBC_MAX); | |
3100 | else | |
3101 | #endif | |
3102 | { | |
3103 | dests_node = (re_node_set *) | |
3104 | malloc ((sizeof (re_node_set) + sizeof (bitset)) * SBC_MAX); | |
3105 | if (BE (dests_node == NULL, 0)) | |
3106 | return NULL; | |
3107 | dests_node_malloced = 1; | |
3108 | } | |
3109 | dests_ch = (bitset *) (dests_node + SBC_MAX); | |
3b0bdc72 UD |
3110 | |
3111 | /* Initialize transiton table. */ | |
3112 | trtable = (re_dfastate_t **) calloc (sizeof (re_dfastate_t *), SBC_MAX); | |
05dab910 RM |
3113 | if (BE (trtable == NULL, 0)) |
3114 | { | |
3115 | if (dests_node_malloced) | |
3116 | free (dests_node); | |
3117 | return NULL; | |
3118 | } | |
3b0bdc72 UD |
3119 | |
3120 | /* At first, group all nodes belonging to `state' into several | |
3121 | destinations. */ | |
3122 | ndests = group_nodes_into_DFAstates (preg, state, dests_node, dests_ch); | |
bc15410e | 3123 | if (BE (ndests <= 0, 0)) |
3b0bdc72 | 3124 | { |
05dab910 RM |
3125 | if (dests_node_malloced) |
3126 | free (dests_node); | |
a9388965 | 3127 | /* Return NULL in case of an error, trtable otherwise. */ |
05dab910 RM |
3128 | if (ndests == 0) |
3129 | return trtable; | |
3130 | free (trtable); | |
3131 | return NULL; | |
3b0bdc72 UD |
3132 | } |
3133 | ||
a9388965 | 3134 | err = re_node_set_alloc (&follows, ndests + 1); |
05dab910 RM |
3135 | if (BE (err != REG_NOERROR, 0)) |
3136 | goto out_free; | |
3137 | ||
3138 | #ifdef _LIBC | |
3139 | if (__libc_use_alloca ((sizeof (re_node_set) + sizeof (bitset)) * SBC_MAX | |
3140 | + ndests * 3 * sizeof (re_dfastate_t *))) | |
3141 | dest_states = (re_dfastate_t **) | |
3142 | alloca (ndests * 3 * sizeof (re_dfastate_t *)); | |
3143 | else | |
3144 | #endif | |
3145 | { | |
3146 | dest_states = (re_dfastate_t **) | |
3147 | malloc (ndests * 3 * sizeof (re_dfastate_t *)); | |
3148 | if (BE (dest_states == NULL, 0)) | |
3149 | { | |
3150 | out_free: | |
3151 | if (dest_states_malloced) | |
3152 | free (dest_states); | |
3153 | re_node_set_free (&follows); | |
3154 | for (i = 0; i < ndests; ++i) | |
3155 | re_node_set_free (dests_node + i); | |
3156 | free (trtable); | |
3157 | if (dests_node_malloced) | |
3158 | free (dests_node); | |
3159 | return NULL; | |
3160 | } | |
3161 | dest_states_malloced = 1; | |
3162 | } | |
3163 | dest_states_word = dest_states + ndests; | |
3164 | dest_states_nl = dest_states_word + ndests; | |
3165 | bitset_empty (acceptable); | |
a9388965 | 3166 | |
3b0bdc72 UD |
3167 | /* Then build the states for all destinations. */ |
3168 | for (i = 0; i < ndests; ++i) | |
3169 | { | |
3170 | int next_node; | |
3171 | re_node_set_empty (&follows); | |
3172 | /* Merge the follows of this destination states. */ | |
3173 | for (j = 0; j < dests_node[i].nelem; ++j) | |
15a7d175 UD |
3174 | { |
3175 | next_node = dfa->nexts[dests_node[i].elems[j]]; | |
3176 | if (next_node != -1) | |
3177 | { | |
3178 | err = re_node_set_merge (&follows, dfa->eclosures + next_node); | |
3179 | if (BE (err != REG_NOERROR, 0)) | |
05dab910 | 3180 | goto out_free; |
15a7d175 UD |
3181 | } |
3182 | } | |
3b0bdc72 UD |
3183 | /* If search flag is set, merge the initial state. */ |
3184 | if (fl_search) | |
15a7d175 | 3185 | { |
3b0bdc72 | 3186 | #ifdef RE_ENABLE_I18N |
15a7d175 UD |
3187 | int not_initial = 0; |
3188 | for (j = 0; j < follows.nelem; ++j) | |
3189 | if (dfa->nodes[follows.elems[j]].type == CHARACTER) | |
3190 | { | |
3191 | not_initial = dfa->nodes[follows.elems[j]].mb_partial; | |
3192 | break; | |
3193 | } | |
3194 | if (!not_initial) | |
3b0bdc72 | 3195 | #endif |
15a7d175 UD |
3196 | { |
3197 | err = re_node_set_merge (&follows, | |
3198 | dfa->init_state->entrance_nodes); | |
3199 | if (BE (err != REG_NOERROR, 0)) | |
3200 | goto out_free; | |
3201 | } | |
3202 | } | |
a9388965 | 3203 | dest_states[i] = re_acquire_state_context (&err, dfa, &follows, 0); |
bc15410e | 3204 | if (BE (dest_states[i] == NULL && err != REG_NOERROR, 0)) |
15a7d175 | 3205 | goto out_free; |
3b0bdc72 | 3206 | /* If the new state has context constraint, |
15a7d175 | 3207 | build appropriate states for these contexts. */ |
3b0bdc72 | 3208 | if (dest_states[i]->has_constraint) |
15a7d175 UD |
3209 | { |
3210 | dest_states_word[i] = re_acquire_state_context (&err, dfa, &follows, | |
3211 | CONTEXT_WORD); | |
3212 | if (BE (dest_states_word[i] == NULL && err != REG_NOERROR, 0)) | |
3213 | goto out_free; | |
3214 | dest_states_nl[i] = re_acquire_state_context (&err, dfa, &follows, | |
3215 | CONTEXT_NEWLINE); | |
3216 | if (BE (dest_states_nl[i] == NULL && err != REG_NOERROR, 0)) | |
3217 | goto out_free; | |
3218 | } | |
3b0bdc72 | 3219 | else |
15a7d175 UD |
3220 | { |
3221 | dest_states_word[i] = dest_states[i]; | |
3222 | dest_states_nl[i] = dest_states[i]; | |
3223 | } | |
3b0bdc72 UD |
3224 | bitset_merge (acceptable, dests_ch[i]); |
3225 | } | |
3226 | ||
3227 | /* Update the transition table. */ | |
c202c2c5 | 3228 | /* For all characters ch...: */ |
3b0bdc72 UD |
3229 | for (i = 0, ch = 0; i < BITSET_UINTS; ++i) |
3230 | for (j = 0; j < UINT_BITS; ++j, ++ch) | |
3231 | if ((acceptable[i] >> j) & 1) | |
15a7d175 UD |
3232 | { |
3233 | /* The current state accepts the character ch. */ | |
3234 | if (IS_WORD_CHAR (ch)) | |
3235 | { | |
3236 | for (k = 0; k < ndests; ++k) | |
3237 | if ((dests_ch[k][i] >> j) & 1) | |
3238 | { | |
3239 | /* k-th destination accepts the word character ch. */ | |
3240 | trtable[ch] = dest_states_word[k]; | |
3241 | /* There must be only one destination which accepts | |
3242 | character ch. See group_nodes_into_DFAstates. */ | |
3243 | break; | |
3244 | } | |
3245 | } | |
3246 | else /* not WORD_CHAR */ | |
3247 | { | |
3248 | for (k = 0; k < ndests; ++k) | |
3249 | if ((dests_ch[k][i] >> j) & 1) | |
3250 | { | |
3251 | /* k-th destination accepts the non-word character ch. */ | |
3252 | trtable[ch] = dest_states[k]; | |
3253 | /* There must be only one destination which accepts | |
3254 | character ch. See group_nodes_into_DFAstates. */ | |
3255 | break; | |
3256 | } | |
3257 | } | |
3258 | } | |
3b0bdc72 | 3259 | /* new line */ |
c202c2c5 UD |
3260 | if (bitset_contain (acceptable, NEWLINE_CHAR)) |
3261 | { | |
3262 | /* The current state accepts newline character. */ | |
3263 | for (k = 0; k < ndests; ++k) | |
15a7d175 UD |
3264 | if (bitset_contain (dests_ch[k], NEWLINE_CHAR)) |
3265 | { | |
3266 | /* k-th destination accepts newline character. */ | |
3267 | trtable[NEWLINE_CHAR] = dest_states_nl[k]; | |
3268 | /* There must be only one destination which accepts | |
3269 | newline. See group_nodes_into_DFAstates. */ | |
3270 | break; | |
3271 | } | |
c202c2c5 | 3272 | } |
3b0bdc72 | 3273 | |
05dab910 RM |
3274 | if (dest_states_malloced) |
3275 | free (dest_states); | |
3b0bdc72 UD |
3276 | |
3277 | re_node_set_free (&follows); | |
3278 | for (i = 0; i < ndests; ++i) | |
3279 | re_node_set_free (dests_node + i); | |
3280 | ||
05dab910 RM |
3281 | if (dests_node_malloced) |
3282 | free (dests_node); | |
3b0bdc72 UD |
3283 | |
3284 | return trtable; | |
3285 | } | |
3286 | ||
3287 | /* Group all nodes belonging to STATE into several destinations. | |
3288 | Then for all destinations, set the nodes belonging to the destination | |
3289 | to DESTS_NODE[i] and set the characters accepted by the destination | |
3290 | to DEST_CH[i]. This function return the number of destinations. */ | |
3291 | ||
3292 | static int | |
3293 | group_nodes_into_DFAstates (preg, state, dests_node, dests_ch) | |
3294 | const regex_t *preg; | |
3295 | const re_dfastate_t *state; | |
3296 | re_node_set *dests_node; | |
3297 | bitset *dests_ch; | |
3298 | { | |
a9388965 | 3299 | reg_errcode_t err; |
3b0bdc72 UD |
3300 | const re_dfa_t *dfa = (re_dfa_t *) preg->buffer; |
3301 | int i, j, k; | |
3302 | int ndests; /* Number of the destinations from `state'. */ | |
3303 | bitset accepts; /* Characters a node can accept. */ | |
3304 | const re_node_set *cur_nodes = &state->nodes; | |
3305 | bitset_empty (accepts); | |
3306 | ndests = 0; | |
3307 | ||
3308 | /* For all the nodes belonging to `state', */ | |
3309 | for (i = 0; i < cur_nodes->nelem; ++i) | |
3310 | { | |
3b0bdc72 UD |
3311 | re_token_t *node = &dfa->nodes[cur_nodes->elems[i]]; |
3312 | re_token_type_t type = node->type; | |
485d775d | 3313 | unsigned int constraint = node->constraint; |
3b0bdc72 UD |
3314 | |
3315 | /* Enumerate all single byte character this node can accept. */ | |
3316 | if (type == CHARACTER) | |
15a7d175 | 3317 | bitset_set (accepts, node->opr.c); |
3b0bdc72 | 3318 | else if (type == SIMPLE_BRACKET) |
15a7d175 UD |
3319 | { |
3320 | bitset_merge (accepts, node->opr.sbcset); | |
3321 | } | |
3b0bdc72 | 3322 | else if (type == OP_PERIOD) |
15a7d175 UD |
3323 | { |
3324 | bitset_set_all (accepts); | |
3325 | if (!(preg->syntax & RE_DOT_NEWLINE)) | |
3326 | bitset_clear (accepts, '\n'); | |
3327 | if (preg->syntax & RE_DOT_NOT_NULL) | |
3328 | bitset_clear (accepts, '\0'); | |
3329 | } | |
3b0bdc72 | 3330 | else |
15a7d175 | 3331 | continue; |
3b0bdc72 UD |
3332 | |
3333 | /* Check the `accepts' and sift the characters which are not | |
15a7d175 | 3334 | match it the context. */ |
3b0bdc72 | 3335 | if (constraint) |
15a7d175 UD |
3336 | { |
3337 | if (constraint & NEXT_WORD_CONSTRAINT) | |
3338 | for (j = 0; j < BITSET_UINTS; ++j) | |
3339 | accepts[j] &= dfa->word_char[j]; | |
3340 | if (constraint & NEXT_NOTWORD_CONSTRAINT) | |
3341 | for (j = 0; j < BITSET_UINTS; ++j) | |
3342 | accepts[j] &= ~dfa->word_char[j]; | |
3343 | if (constraint & NEXT_NEWLINE_CONSTRAINT) | |
3344 | { | |
3345 | int accepts_newline = bitset_contain (accepts, NEWLINE_CHAR); | |
3346 | bitset_empty (accepts); | |
3347 | if (accepts_newline) | |
3348 | bitset_set (accepts, NEWLINE_CHAR); | |
3349 | else | |
3350 | continue; | |
3351 | } | |
3352 | } | |
3b0bdc72 UD |
3353 | |
3354 | /* Then divide `accepts' into DFA states, or create a new | |
15a7d175 | 3355 | state. */ |
3b0bdc72 | 3356 | for (j = 0; j < ndests; ++j) |
15a7d175 UD |
3357 | { |
3358 | bitset intersec; /* Intersection sets, see below. */ | |
3359 | bitset remains; | |
3360 | /* Flags, see below. */ | |
3361 | int has_intersec, not_subset, not_consumed; | |
3362 | ||
3363 | /* Optimization, skip if this state doesn't accept the character. */ | |
3364 | if (type == CHARACTER && !bitset_contain (dests_ch[j], node->opr.c)) | |
3365 | continue; | |
3366 | ||
3367 | /* Enumerate the intersection set of this state and `accepts'. */ | |
3368 | has_intersec = 0; | |
3369 | for (k = 0; k < BITSET_UINTS; ++k) | |
3370 | has_intersec |= intersec[k] = accepts[k] & dests_ch[j][k]; | |
3371 | /* And skip if the intersection set is empty. */ | |
3372 | if (!has_intersec) | |
3373 | continue; | |
3374 | ||
3375 | /* Then check if this state is a subset of `accepts'. */ | |
3376 | not_subset = not_consumed = 0; | |
3377 | for (k = 0; k < BITSET_UINTS; ++k) | |
3378 | { | |
3379 | not_subset |= remains[k] = ~accepts[k] & dests_ch[j][k]; | |
3380 | not_consumed |= accepts[k] = accepts[k] & ~dests_ch[j][k]; | |
3381 | } | |
3382 | ||
3383 | /* If this state isn't a subset of `accepts', create a | |
3384 | new group state, which has the `remains'. */ | |
3385 | if (not_subset) | |
3386 | { | |
3387 | bitset_copy (dests_ch[ndests], remains); | |
3388 | bitset_copy (dests_ch[j], intersec); | |
3389 | err = re_node_set_init_copy (dests_node + ndests, &dests_node[j]); | |
3390 | if (BE (err != REG_NOERROR, 0)) | |
3391 | goto error_return; | |
3392 | ++ndests; | |
3393 | } | |
3394 | ||
3395 | /* Put the position in the current group. */ | |
3396 | err = re_node_set_insert (&dests_node[j], cur_nodes->elems[i]); | |
3397 | if (BE (err < 0, 0)) | |
3398 | goto error_return; | |
3399 | ||
3400 | /* If all characters are consumed, go to next node. */ | |
3401 | if (!not_consumed) | |
3402 | break; | |
3403 | } | |
3b0bdc72 UD |
3404 | /* Some characters remain, create a new group. */ |
3405 | if (j == ndests) | |
15a7d175 UD |
3406 | { |
3407 | bitset_copy (dests_ch[ndests], accepts); | |
3408 | err = re_node_set_init_1 (dests_node + ndests, cur_nodes->elems[i]); | |
3409 | if (BE (err != REG_NOERROR, 0)) | |
3410 | goto error_return; | |
3411 | ++ndests; | |
3412 | bitset_empty (accepts); | |
3413 | } | |
3b0bdc72 UD |
3414 | } |
3415 | return ndests; | |
1b2c2628 UD |
3416 | error_return: |
3417 | for (j = 0; j < ndests; ++j) | |
3418 | re_node_set_free (dests_node + j); | |
3419 | return -1; | |
3b0bdc72 UD |
3420 | } |
3421 | ||
434d3784 UD |
3422 | #ifdef RE_ENABLE_I18N |
3423 | /* Check how many bytes the node `dfa->nodes[node_idx]' accepts. | |
3424 | Return the number of the bytes the node accepts. | |
3425 | STR_IDX is the current index of the input string. | |
3426 | ||
3427 | This function handles the nodes which can accept one character, or | |
3428 | one collating element like '.', '[a-z]', opposite to the other nodes | |
3429 | can only accept one byte. */ | |
3b0bdc72 UD |
3430 | |
3431 | static int | |
3432 | check_node_accept_bytes (preg, node_idx, input, str_idx) | |
3433 | const regex_t *preg; | |
3434 | int node_idx, str_idx; | |
3435 | const re_string_t *input; | |
3436 | { | |
3437 | const re_dfa_t *dfa = (re_dfa_t *) preg->buffer; | |
3438 | const re_token_t *node = dfa->nodes + node_idx; | |
3439 | int elem_len = re_string_elem_size_at (input, str_idx); | |
3440 | int char_len = re_string_char_size_at (input, str_idx); | |
434d3784 UD |
3441 | int i; |
3442 | # ifdef _LIBC | |
3443 | int j; | |
3b0bdc72 | 3444 | uint32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES); |
434d3784 | 3445 | # endif /* _LIBC */ |
3b0bdc72 UD |
3446 | if (elem_len <= 1 && char_len <= 1) |
3447 | return 0; | |
3448 | if (node->type == OP_PERIOD) | |
3449 | { | |
434d3784 | 3450 | /* '.' accepts any one character except the following two cases. */ |
3b0bdc72 | 3451 | if ((!(preg->syntax & RE_DOT_NEWLINE) && |
15a7d175 UD |
3452 | re_string_byte_at (input, str_idx) == '\n') || |
3453 | ((preg->syntax & RE_DOT_NOT_NULL) && | |
3454 | re_string_byte_at (input, str_idx) == '\0')) | |
3455 | return 0; | |
3b0bdc72 UD |
3456 | return char_len; |
3457 | } | |
3458 | else if (node->type == COMPLEX_BRACKET) | |
3459 | { | |
3460 | const re_charset_t *cset = node->opr.mbcset; | |
434d3784 | 3461 | # ifdef _LIBC |
85c54a32 UD |
3462 | const unsigned char *pin = ((char *) re_string_get_buffer (input) |
3463 | + str_idx); | |
434d3784 UD |
3464 | # endif /* _LIBC */ |
3465 | int match_len = 0; | |
3466 | wchar_t wc = ((cset->nranges || cset->nchar_classes || cset->nmbchars) | |
15a7d175 | 3467 | ? re_string_wchar_at (input, str_idx) : 0); |
434d3784 UD |
3468 | |
3469 | /* match with multibyte character? */ | |
3470 | for (i = 0; i < cset->nmbchars; ++i) | |
15a7d175 UD |
3471 | if (wc == cset->mbchars[i]) |
3472 | { | |
3473 | match_len = char_len; | |
3474 | goto check_node_accept_bytes_match; | |
3475 | } | |
434d3784 UD |
3476 | /* match with character_class? */ |
3477 | for (i = 0; i < cset->nchar_classes; ++i) | |
15a7d175 UD |
3478 | { |
3479 | wctype_t wt = cset->char_classes[i]; | |
3480 | if (__iswctype (wc, wt)) | |
3481 | { | |
3482 | match_len = char_len; | |
3483 | goto check_node_accept_bytes_match; | |
3484 | } | |
3485 | } | |
434d3784 UD |
3486 | |
3487 | # ifdef _LIBC | |
3b0bdc72 | 3488 | if (nrules != 0) |
15a7d175 UD |
3489 | { |
3490 | unsigned int in_collseq = 0; | |
3491 | const int32_t *table, *indirect; | |
3492 | const unsigned char *weights, *extra; | |
3493 | const char *collseqwc; | |
3494 | int32_t idx; | |
3495 | /* This #include defines a local function! */ | |
434d3784 | 3496 | # include <locale/weight.h> |
3b0bdc72 | 3497 | |
15a7d175 UD |
3498 | /* match with collating_symbol? */ |
3499 | if (cset->ncoll_syms) | |
3500 | extra = (const unsigned char *) | |
3501 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB); | |
3502 | for (i = 0; i < cset->ncoll_syms; ++i) | |
3503 | { | |
3504 | const unsigned char *coll_sym = extra + cset->coll_syms[i]; | |
3505 | /* Compare the length of input collating element and | |
3506 | the length of current collating element. */ | |
3507 | if (*coll_sym != elem_len) | |
3508 | continue; | |
3509 | /* Compare each bytes. */ | |
3510 | for (j = 0; j < *coll_sym; j++) | |
3511 | if (pin[j] != coll_sym[1 + j]) | |
3512 | break; | |
3513 | if (j == *coll_sym) | |
3514 | { | |
3515 | /* Match if every bytes is equal. */ | |
3516 | match_len = j; | |
3517 | goto check_node_accept_bytes_match; | |
3518 | } | |
3519 | } | |
3520 | ||
3521 | if (cset->nranges) | |
3522 | { | |
3523 | if (elem_len <= char_len) | |
3524 | { | |
3525 | collseqwc = _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQWC); | |
3526 | in_collseq = collseq_table_lookup (collseqwc, wc); | |
3527 | } | |
3528 | else | |
3529 | in_collseq = find_collation_sequence_value (pin, elem_len); | |
3530 | } | |
3531 | /* match with range expression? */ | |
3532 | for (i = 0; i < cset->nranges; ++i) | |
3533 | if (cset->range_starts[i] <= in_collseq | |
3534 | && in_collseq <= cset->range_ends[i]) | |
3535 | { | |
3536 | match_len = elem_len; | |
3537 | goto check_node_accept_bytes_match; | |
3538 | } | |
3539 | ||
3540 | /* match with equivalence_class? */ | |
3541 | if (cset->nequiv_classes) | |
3542 | { | |
3543 | const unsigned char *cp = pin; | |
3544 | table = (const int32_t *) | |
3545 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB); | |
3546 | weights = (const unsigned char *) | |
3547 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_WEIGHTMB); | |
3548 | extra = (const unsigned char *) | |
3549 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB); | |
3550 | indirect = (const int32_t *) | |
3551 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_INDIRECTMB); | |
3552 | idx = findidx (&cp); | |
3553 | if (idx > 0) | |
3554 | for (i = 0; i < cset->nequiv_classes; ++i) | |
3555 | { | |
3556 | int32_t equiv_class_idx = cset->equiv_classes[i]; | |
3557 | size_t weight_len = weights[idx]; | |
3558 | if (weight_len == weights[equiv_class_idx]) | |
3559 | { | |
3560 | int cnt = 0; | |
3561 | while (cnt <= weight_len | |
3562 | && (weights[equiv_class_idx + 1 + cnt] | |
3563 | == weights[idx + 1 + cnt])) | |
3564 | ++cnt; | |
3565 | if (cnt > weight_len) | |
3566 | { | |
3567 | match_len = elem_len; | |
3568 | goto check_node_accept_bytes_match; | |
3569 | } | |
3570 | } | |
3571 | } | |
3572 | } | |
3573 | } | |
434d3784 UD |
3574 | else |
3575 | # endif /* _LIBC */ | |
15a7d175 UD |
3576 | { |
3577 | /* match with range expression? */ | |
92b27c74 | 3578 | #if __GNUC__ >= 2 |
15a7d175 | 3579 | wchar_t cmp_buf[] = {L'\0', L'\0', wc, L'\0', L'\0', L'\0'}; |
92b27c74 | 3580 | #else |
15a7d175 UD |
3581 | wchar_t cmp_buf[] = {L'\0', L'\0', L'\0', L'\0', L'\0', L'\0'}; |
3582 | cmp_buf[2] = wc; | |
92b27c74 | 3583 | #endif |
15a7d175 UD |
3584 | for (i = 0; i < cset->nranges; ++i) |
3585 | { | |
3586 | cmp_buf[0] = cset->range_starts[i]; | |
3587 | cmp_buf[4] = cset->range_ends[i]; | |
3588 | if (wcscoll (cmp_buf, cmp_buf + 2) <= 0 | |
3589 | && wcscoll (cmp_buf + 2, cmp_buf + 4) <= 0) | |
3590 | { | |
3591 | match_len = char_len; | |
3592 | goto check_node_accept_bytes_match; | |
3593 | } | |
3594 | } | |
3595 | } | |
434d3784 UD |
3596 | check_node_accept_bytes_match: |
3597 | if (!cset->non_match) | |
15a7d175 | 3598 | return match_len; |
434d3784 | 3599 | else |
15a7d175 UD |
3600 | { |
3601 | if (match_len > 0) | |
3602 | return 0; | |
3603 | else | |
3604 | return (elem_len > char_len) ? elem_len : char_len; | |
3605 | } | |
3b0bdc72 UD |
3606 | } |
3607 | return 0; | |
3608 | } | |
3609 | ||
434d3784 | 3610 | # ifdef _LIBC |
3b0bdc72 UD |
3611 | static unsigned int |
3612 | find_collation_sequence_value (mbs, mbs_len) | |
c202c2c5 | 3613 | const unsigned char *mbs; |
3b0bdc72 UD |
3614 | size_t mbs_len; |
3615 | { | |
3616 | uint32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES); | |
3617 | if (nrules == 0) | |
3618 | { | |
3619 | if (mbs_len == 1) | |
15a7d175 UD |
3620 | { |
3621 | /* No valid character. Match it as a single byte character. */ | |
3622 | const unsigned char *collseq = (const unsigned char *) | |
3623 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQMB); | |
3624 | return collseq[mbs[0]]; | |
3625 | } | |
3b0bdc72 UD |
3626 | return UINT_MAX; |
3627 | } | |
3628 | else | |
3629 | { | |
3630 | int32_t idx; | |
3631 | const unsigned char *extra = (const unsigned char *) | |
15a7d175 | 3632 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB); |
3b0bdc72 UD |
3633 | |
3634 | for (idx = 0; ;) | |
15a7d175 UD |
3635 | { |
3636 | int mbs_cnt, found = 0; | |
3637 | int32_t elem_mbs_len; | |
3638 | /* Skip the name of collating element name. */ | |
3639 | idx = idx + extra[idx] + 1; | |
3640 | elem_mbs_len = extra[idx++]; | |
3641 | if (mbs_len == elem_mbs_len) | |
3642 | { | |
3643 | for (mbs_cnt = 0; mbs_cnt < elem_mbs_len; ++mbs_cnt) | |
3644 | if (extra[idx + mbs_cnt] != mbs[mbs_cnt]) | |
3645 | break; | |
3646 | if (mbs_cnt == elem_mbs_len) | |
3647 | /* Found the entry. */ | |
3648 | found = 1; | |
3649 | } | |
3650 | /* Skip the byte sequence of the collating element. */ | |
3651 | idx += elem_mbs_len; | |
3652 | /* Adjust for the alignment. */ | |
3653 | idx = (idx + 3) & ~3; | |
3654 | /* Skip the collation sequence value. */ | |
3655 | idx += sizeof (uint32_t); | |
3656 | /* Skip the wide char sequence of the collating element. */ | |
3657 | idx = idx + sizeof (uint32_t) * (extra[idx] + 1); | |
3658 | /* If we found the entry, return the sequence value. */ | |
3659 | if (found) | |
3660 | return *(uint32_t *) (extra + idx); | |
3661 | /* Skip the collation sequence value. */ | |
3662 | idx += sizeof (uint32_t); | |
3663 | } | |
3b0bdc72 UD |
3664 | } |
3665 | } | |
434d3784 UD |
3666 | # endif /* _LIBC */ |
3667 | #endif /* RE_ENABLE_I18N */ | |
3b0bdc72 UD |
3668 | |
3669 | /* Check whether the node accepts the byte which is IDX-th | |
3670 | byte of the INPUT. */ | |
3671 | ||
3672 | static int | |
612546c6 | 3673 | check_node_accept (preg, node, mctx, idx) |
3b0bdc72 UD |
3674 | const regex_t *preg; |
3675 | const re_token_t *node; | |
612546c6 UD |
3676 | const re_match_context_t *mctx; |
3677 | int idx; | |
3b0bdc72 | 3678 | { |
3b0bdc72 | 3679 | unsigned char ch; |
485d775d | 3680 | if (node->constraint) |
3b0bdc72 UD |
3681 | { |
3682 | /* The node has constraints. Check whether the current context | |
15a7d175 | 3683 | satisfies the constraints. */ |
612546c6 | 3684 | unsigned int context = re_string_context_at (mctx->input, idx, |
15a7d175 UD |
3685 | mctx->eflags, |
3686 | preg->newline_anchor); | |
3b0bdc72 | 3687 | if (NOT_SATISFY_NEXT_CONSTRAINT (node->constraint, context)) |
15a7d175 | 3688 | return 0; |
3b0bdc72 | 3689 | } |
612546c6 | 3690 | ch = re_string_byte_at (mctx->input, idx); |
485d775d UD |
3691 | if (node->type == CHARACTER) |
3692 | return node->opr.c == ch; | |
3693 | else if (node->type == SIMPLE_BRACKET) | |
3694 | return bitset_contain (node->opr.sbcset, ch); | |
3695 | else if (node->type == OP_PERIOD) | |
3b0bdc72 | 3696 | return !((ch == '\n' && !(preg->syntax & RE_DOT_NEWLINE)) |
15a7d175 | 3697 | || (ch == '\0' && (preg->syntax & RE_DOT_NOT_NULL))); |
3b0bdc72 UD |
3698 | else |
3699 | return 0; | |
3700 | } | |
612546c6 UD |
3701 | |
3702 | /* Extend the buffers, if the buffers have run out. */ | |
3703 | ||
3704 | static reg_errcode_t | |
3705 | extend_buffers (mctx) | |
3706 | re_match_context_t *mctx; | |
3707 | { | |
3708 | reg_errcode_t ret; | |
3709 | re_string_t *pstr = mctx->input; | |
3710 | ||
3711 | /* Double the lengthes of the buffers. */ | |
3712 | ret = re_string_realloc_buffers (pstr, pstr->bufs_len * 2); | |
3713 | if (BE (ret != REG_NOERROR, 0)) | |
3714 | return ret; | |
3715 | ||
3716 | if (mctx->state_log != NULL) | |
3717 | { | |
3718 | /* And double the length of state_log. */ | |
1b2c2628 UD |
3719 | re_dfastate_t **new_array; |
3720 | new_array = re_realloc (mctx->state_log, re_dfastate_t *, | |
15a7d175 | 3721 | pstr->bufs_len * 2); |
1b2c2628 | 3722 | if (BE (new_array == NULL, 0)) |
15a7d175 | 3723 | return REG_ESPACE; |
1b2c2628 | 3724 | mctx->state_log = new_array; |
612546c6 UD |
3725 | } |
3726 | ||
3727 | /* Then reconstruct the buffers. */ | |
3728 | if (pstr->icase) | |
3729 | { | |
3730 | #ifdef RE_ENABLE_I18N | |
3731 | if (MB_CUR_MAX > 1) | |
15a7d175 | 3732 | build_wcs_upper_buffer (pstr); |
612546c6 UD |
3733 | else |
3734 | #endif /* RE_ENABLE_I18N */ | |
15a7d175 | 3735 | build_upper_buffer (pstr); |
612546c6 UD |
3736 | } |
3737 | else | |
3738 | { | |
3739 | #ifdef RE_ENABLE_I18N | |
3740 | if (MB_CUR_MAX > 1) | |
15a7d175 | 3741 | build_wcs_buffer (pstr); |
612546c6 UD |
3742 | else |
3743 | #endif /* RE_ENABLE_I18N */ | |
15a7d175 UD |
3744 | { |
3745 | if (pstr->trans != NULL) | |
3746 | re_string_translate_buffer (pstr); | |
3747 | else | |
3748 | pstr->valid_len = pstr->bufs_len; | |
3749 | } | |
612546c6 UD |
3750 | } |
3751 | return REG_NOERROR; | |
3752 | } | |
3753 | ||
3b0bdc72 UD |
3754 | \f |
3755 | /* Functions for matching context. */ | |
3756 | ||
6291ee3c UD |
3757 | /* Initialize MCTX. */ |
3758 | ||
a9388965 | 3759 | static reg_errcode_t |
612546c6 | 3760 | match_ctx_init (mctx, eflags, input, n) |
3b0bdc72 | 3761 | re_match_context_t *mctx; |
612546c6 UD |
3762 | int eflags, n; |
3763 | re_string_t *input; | |
3b0bdc72 UD |
3764 | { |
3765 | mctx->eflags = eflags; | |
612546c6 UD |
3766 | mctx->input = input; |
3767 | mctx->match_last = -1; | |
3b0bdc72 | 3768 | if (n > 0) |
a9388965 UD |
3769 | { |
3770 | mctx->bkref_ents = re_malloc (struct re_backref_cache_entry, n); | |
6291ee3c UD |
3771 | mctx->sub_tops = re_malloc (re_sub_match_top_t *, n); |
3772 | if (BE (mctx->bkref_ents == NULL || mctx->sub_tops == NULL, 0)) | |
15a7d175 | 3773 | return REG_ESPACE; |
a9388965 | 3774 | } |
3b0bdc72 UD |
3775 | else |
3776 | mctx->bkref_ents = NULL; | |
3777 | mctx->nbkref_ents = 0; | |
3778 | mctx->abkref_ents = n; | |
6291ee3c UD |
3779 | mctx->max_mb_elem_len = 1; |
3780 | mctx->nsub_tops = 0; | |
3781 | mctx->asub_tops = n; | |
a9388965 | 3782 | return REG_NOERROR; |
3b0bdc72 UD |
3783 | } |
3784 | ||
6291ee3c UD |
3785 | /* Clean the entries which depend on the current input in MCTX. |
3786 | This function must be invoked when the matcher changes the start index | |
3787 | of the input, or changes the input string. */ | |
3788 | ||
3789 | static void | |
3790 | match_ctx_clean (mctx) | |
3791 | re_match_context_t *mctx; | |
3792 | { | |
3793 | match_ctx_free_subtops (mctx); | |
3794 | mctx->nsub_tops = 0; | |
3795 | mctx->nbkref_ents = 0; | |
3796 | } | |
3797 | ||
3798 | /* Free all the memory associated with MCTX. */ | |
3799 | ||
3b0bdc72 UD |
3800 | static void |
3801 | match_ctx_free (mctx) | |
3802 | re_match_context_t *mctx; | |
3803 | { | |
6291ee3c UD |
3804 | match_ctx_free_subtops (mctx); |
3805 | re_free (mctx->sub_tops); | |
3b0bdc72 UD |
3806 | re_free (mctx->bkref_ents); |
3807 | } | |
3808 | ||
6291ee3c UD |
3809 | /* Free all the memory associated with MCTX->SUB_TOPS. */ |
3810 | ||
3811 | static void | |
3812 | match_ctx_free_subtops (mctx) | |
3813 | re_match_context_t *mctx; | |
3814 | { | |
3815 | int st_idx; | |
3816 | for (st_idx = 0; st_idx < mctx->nsub_tops; ++st_idx) | |
3817 | { | |
3818 | int sl_idx; | |
3819 | re_sub_match_top_t *top = mctx->sub_tops[st_idx]; | |
3820 | for (sl_idx = 0; sl_idx < top->nlasts; ++sl_idx) | |
3821 | { | |
3822 | re_sub_match_last_t *last = top->lasts[sl_idx]; | |
3823 | re_free (last->path.array); | |
3824 | re_free (last); | |
3825 | } | |
3826 | re_free (top->lasts); | |
3827 | if (top->path) | |
3828 | { | |
3829 | re_free (top->path->array); | |
3830 | re_free (top->path); | |
3831 | } | |
3832 | free (top); | |
3833 | } | |
3834 | } | |
3835 | ||
3836 | /* Add a new backreference entry to MCTX. | |
3837 | Note that we assume that caller never call this function with duplicate | |
3838 | entry, and call with STR_IDX which isn't smaller than any existing entry. | |
3839 | */ | |
3b0bdc72 | 3840 | |
a9388965 | 3841 | static reg_errcode_t |
0742e48e | 3842 | match_ctx_add_entry (mctx, node, str_idx, from, to) |
6291ee3c UD |
3843 | re_match_context_t *mctx; |
3844 | int node, str_idx, from, to; | |
3b0bdc72 UD |
3845 | { |
3846 | if (mctx->nbkref_ents >= mctx->abkref_ents) | |
3847 | { | |
1b2c2628 UD |
3848 | struct re_backref_cache_entry* new_entry; |
3849 | new_entry = re_realloc (mctx->bkref_ents, struct re_backref_cache_entry, | |
15a7d175 | 3850 | mctx->abkref_ents * 2); |
1b2c2628 | 3851 | if (BE (new_entry == NULL, 0)) |
15a7d175 UD |
3852 | { |
3853 | re_free (mctx->bkref_ents); | |
3854 | return REG_ESPACE; | |
3855 | } | |
1b2c2628 | 3856 | mctx->bkref_ents = new_entry; |
3b0bdc72 | 3857 | memset (mctx->bkref_ents + mctx->nbkref_ents, '\0', |
15a7d175 | 3858 | sizeof (struct re_backref_cache_entry) * mctx->abkref_ents); |
3b0bdc72 UD |
3859 | mctx->abkref_ents *= 2; |
3860 | } | |
3861 | mctx->bkref_ents[mctx->nbkref_ents].node = node; | |
0742e48e UD |
3862 | mctx->bkref_ents[mctx->nbkref_ents].str_idx = str_idx; |
3863 | mctx->bkref_ents[mctx->nbkref_ents].subexp_from = from; | |
3864 | mctx->bkref_ents[mctx->nbkref_ents].subexp_to = to; | |
3865 | mctx->bkref_ents[mctx->nbkref_ents++].flag = 0; | |
3866 | if (mctx->max_mb_elem_len < to - from) | |
3867 | mctx->max_mb_elem_len = to - from; | |
a9388965 | 3868 | return REG_NOERROR; |
3b0bdc72 | 3869 | } |
0742e48e | 3870 | |
6291ee3c UD |
3871 | /* Search for the first entry which has the same str_idx. |
3872 | Note that MCTX->BKREF_ENTS is already sorted by MCTX->STR_IDX. */ | |
3873 | ||
3874 | static int | |
3875 | search_cur_bkref_entry (mctx, str_idx) | |
3876 | re_match_context_t *mctx; | |
3877 | int str_idx; | |
3878 | { | |
3879 | int left, right, mid; | |
3880 | right = mctx->nbkref_ents; | |
3881 | for (left = 0; left < right;) | |
3882 | { | |
3883 | mid = (left + right) / 2; | |
3884 | if (mctx->bkref_ents[mid].str_idx < str_idx) | |
3885 | left = mid + 1; | |
3886 | else | |
3887 | right = mid; | |
3888 | } | |
3889 | return left; | |
3890 | } | |
3891 | ||
0742e48e UD |
3892 | static void |
3893 | match_ctx_clear_flag (mctx) | |
3894 | re_match_context_t *mctx; | |
3895 | { | |
3896 | int i; | |
3897 | for (i = 0; i < mctx->nbkref_ents; ++i) | |
3898 | { | |
3899 | mctx->bkref_ents[i].flag = 0; | |
3900 | } | |
3901 | } | |
3902 | ||
6291ee3c UD |
3903 | /* Register the node NODE, whose type is OP_OPEN_SUBEXP, and which matches |
3904 | at STR_IDX. */ | |
3905 | ||
3906 | static reg_errcode_t | |
3907 | match_ctx_add_subtop (mctx, node, str_idx) | |
3908 | re_match_context_t *mctx; | |
3909 | int node, str_idx; | |
3910 | { | |
3911 | #ifdef DEBUG | |
3912 | assert (mctx->sub_tops != NULL); | |
3913 | assert (mctx->asub_tops > 0); | |
3914 | #endif | |
3915 | if (mctx->nsub_tops == mctx->asub_tops) | |
3916 | { | |
3917 | re_sub_match_top_t **new_array; | |
3918 | mctx->asub_tops *= 2; | |
3919 | new_array = re_realloc (mctx->sub_tops, re_sub_match_top_t *, | |
3920 | mctx->asub_tops); | |
3921 | if (BE (new_array == NULL, 0)) | |
3922 | return REG_ESPACE; | |
3923 | mctx->sub_tops = new_array; | |
3924 | } | |
3925 | mctx->sub_tops[mctx->nsub_tops] = calloc (1, sizeof (re_sub_match_top_t)); | |
3926 | if (mctx->sub_tops[mctx->nsub_tops] == NULL) | |
3927 | return REG_ESPACE; | |
3928 | mctx->sub_tops[mctx->nsub_tops]->node = node; | |
3929 | mctx->sub_tops[mctx->nsub_tops++]->str_idx = str_idx; | |
3930 | return REG_NOERROR; | |
3931 | } | |
3932 | ||
3933 | /* Register the node NODE, whose type is OP_CLOSE_SUBEXP, and which matches | |
3934 | at STR_IDX, whose corresponding OP_OPEN_SUBEXP is SUB_TOP. */ | |
3935 | ||
3936 | static re_sub_match_last_t * | |
3937 | match_ctx_add_sublast (subtop, node, str_idx) | |
3938 | re_sub_match_top_t *subtop; | |
3939 | int node, str_idx; | |
3940 | { | |
3941 | re_sub_match_last_t *new_entry; | |
3942 | if (subtop->nlasts == subtop->alasts) | |
3943 | { | |
3944 | re_sub_match_last_t **new_array; | |
3945 | subtop->alasts = 2 * subtop->alasts + 1; | |
3946 | new_array = re_realloc (subtop->lasts, re_sub_match_last_t *, | |
3947 | subtop->alasts); | |
3948 | if (BE (new_array == NULL, 0)) | |
3949 | return NULL; | |
3950 | subtop->lasts = new_array; | |
3951 | } | |
3952 | new_entry = calloc (1, sizeof (re_sub_match_last_t)); | |
3953 | if (BE (new_entry == NULL, 0)) | |
3954 | return NULL; | |
3955 | subtop->lasts[subtop->nlasts] = new_entry; | |
3956 | new_entry->node = node; | |
3957 | new_entry->str_idx = str_idx; | |
3958 | ++subtop->nlasts; | |
3959 | return new_entry; | |
3960 | } | |
3961 | ||
0742e48e UD |
3962 | static void |
3963 | sift_ctx_init (sctx, sifted_sts, limited_sts, last_node, last_str_idx, | |
15a7d175 | 3964 | check_subexp) |
0742e48e UD |
3965 | re_sift_context_t *sctx; |
3966 | re_dfastate_t **sifted_sts, **limited_sts; | |
3967 | int last_node, last_str_idx, check_subexp; | |
3968 | { | |
3969 | sctx->sifted_states = sifted_sts; | |
3970 | sctx->limited_states = limited_sts; | |
3971 | sctx->last_node = last_node; | |
3972 | sctx->last_str_idx = last_str_idx; | |
3973 | sctx->check_subexp = check_subexp; | |
485d775d UD |
3974 | sctx->cur_bkref = -1; |
3975 | sctx->cls_subexp_idx = -1; | |
0742e48e UD |
3976 | re_node_set_init_empty (&sctx->limits); |
3977 | } |