1 /* Extended regular expression matching and search library.
2 Copyright (C) 2002-2021 Free Software Foundation, Inc.
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 General Public
8 License as published by the Free Software Foundation; either
9 version 3 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 General Public License for more details.
15
16 You should have received a copy of the GNU General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20 #ifndef _REGEX_INTERNAL_H
21 #define _REGEX_INTERNAL_H 1
22
23 #include <ctype.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27
28 #include <langinfo.h>
29 #include <locale.h>
30 #include <wchar.h>
31 #include <wctype.h>
32 #include <stdbool.h>
33 #include <stdint.h>
34
35 #ifndef _LIBC
36 # include <dynarray.h>
37 #endif
38
39 #include <intprops.h>
40 #include <verify.h>
41
42 #if defined DEBUG && DEBUG != 0
43 # include <assert.h>
44 # define DEBUG_ASSERT(x) assert (x)
45 #else
46 # define DEBUG_ASSERT(x) assume (x)
47 #endif
48
49 #ifdef _LIBC
50 # include <libc-lock.h>
51 # define lock_define(name) __libc_lock_define (, name)
52 # define lock_init(lock) (__libc_lock_init (lock), 0)
53 # define lock_fini(lock) ((void) 0)
54 # define lock_lock(lock) __libc_lock_lock (lock)
55 # define lock_unlock(lock) __libc_lock_unlock (lock)
56 #elif defined GNULIB_LOCK && !defined USE_UNLOCKED_IO
57 # include "glthread/lock.h"
58 # define lock_define(name) gl_lock_define (, name)
59 # define lock_init(lock) glthread_lock_init (&(lock))
60 # define lock_fini(lock) glthread_lock_destroy (&(lock))
61 # define lock_lock(lock) glthread_lock_lock (&(lock))
62 # define lock_unlock(lock) glthread_lock_unlock (&(lock))
63 #elif defined GNULIB_PTHREAD && !defined USE_UNLOCKED_IO
64 # include <pthread.h>
65 # define lock_define(name) pthread_mutex_t name;
66 # define lock_init(lock) pthread_mutex_init (&(lock), 0)
67 # define lock_fini(lock) pthread_mutex_destroy (&(lock))
68 # define lock_lock(lock) pthread_mutex_lock (&(lock))
69 # define lock_unlock(lock) pthread_mutex_unlock (&(lock))
70 #else
71 # define lock_define(name)
72 # define lock_init(lock) 0
73 # define lock_fini(lock) ((void) 0)
74 /* The 'dfa' avoids an "unused variable 'dfa'" warning from GCC. */
75 # define lock_lock(lock) ((void) dfa)
76 # define lock_unlock(lock) ((void) 0)
77 #endif
78
79 /* In case that the system doesn't have isblank(). */
80 #if !defined _LIBC && ! (defined isblank || (HAVE_ISBLANK && HAVE_DECL_ISBLANK))
81 # define isblank(ch) ((ch) == ' ' || (ch) == '\t')
82 #endif
83
84 /* regex code assumes isascii has its usual numeric meaning,
85 even if the portable character set uses EBCDIC encoding,
86 and even if wint_t is wider than int. */
87 #ifndef _LIBC
88 # undef isascii
89 # define isascii(c) (((c) & ~0x7f) == 0)
90 #endif
91
92 #ifdef _LIBC
93 # ifndef _RE_DEFINE_LOCALE_FUNCTIONS
94 # define _RE_DEFINE_LOCALE_FUNCTIONS 1
95 # include <locale/localeinfo.h>
96 # include <locale/coll-lookup.h>
97 # endif
98 #endif
99
100 /* This is for other GNU distributions with internationalized messages. */
101 #if (HAVE_LIBINTL_H && ENABLE_NLS) || defined _LIBC
102 # include <libintl.h>
103 # ifdef _LIBC
104 # undef gettext
105 # define gettext(msgid) \
106 __dcgettext (_libc_intl_domainname, msgid, LC_MESSAGES)
107 # endif
108 #else
109 # undef gettext
110 # define gettext(msgid) (msgid)
111 #endif
112
113 #ifndef gettext_noop
114 /* This define is so xgettext can find the internationalizable
115 strings. */
116 # define gettext_noop(String) String
117 #endif
118
119 #if (defined MB_CUR_MAX && HAVE_WCTYPE_H && HAVE_ISWCTYPE) || _LIBC
120 # define RE_ENABLE_I18N
121 #endif
122
123 /* Number of ASCII characters. */
124 #define ASCII_CHARS 0x80
125
126 /* Number of single byte characters. */
127 #define SBC_MAX (UCHAR_MAX + 1)
128
129 #define COLL_ELEM_LEN_MAX 8
130
131 /* The character which represents newline. */
132 #define NEWLINE_CHAR '\n'
133 #define WIDE_NEWLINE_CHAR L'\n'
134
135 /* Rename to standard API for using out of glibc. */
136 #ifndef _LIBC
137 # undef __wctype
138 # undef __iswalnum
139 # undef __iswctype
140 # undef __towlower
141 # undef __towupper
142 # define __wctype wctype
143 # define __iswalnum iswalnum
144 # define __iswctype iswctype
145 # define __towlower towlower
146 # define __towupper towupper
147 # define __btowc btowc
148 # define __mbrtowc mbrtowc
149 # define __wcrtomb wcrtomb
150 # define __regfree regfree
151 #endif /* not _LIBC */
152
153 #ifndef SSIZE_MAX
154 # define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
155 #endif
156 #ifndef ULONG_WIDTH
157 # define ULONG_WIDTH REGEX_UINTEGER_WIDTH (ULONG_MAX)
158 /* The number of usable bits in an unsigned integer type with maximum
159 value MAX, as an int expression suitable in #if. Cover all known
160 practical hosts. This implementation exploits the fact that MAX is
161 1 less than a power of 2, and merely counts the number of 1 bits in
162 MAX; "COBn" means "count the number of 1 bits in the low-order n bits". */
163 # define REGEX_UINTEGER_WIDTH(max) REGEX_COB128 (max)
164 # define REGEX_COB128(n) (REGEX_COB64 ((n) >> 31 >> 31 >> 2) + REGEX_COB64 (n))
165 # define REGEX_COB64(n) (REGEX_COB32 ((n) >> 31 >> 1) + REGEX_COB32 (n))
166 # define REGEX_COB32(n) (REGEX_COB16 ((n) >> 16) + REGEX_COB16 (n))
167 # define REGEX_COB16(n) (REGEX_COB8 ((n) >> 8) + REGEX_COB8 (n))
168 # define REGEX_COB8(n) (REGEX_COB4 ((n) >> 4) + REGEX_COB4 (n))
169 # define REGEX_COB4(n) (!!((n) & 8) + !!((n) & 4) + !!((n) & 2) + ((n) & 1))
170 # if ULONG_MAX / 2 + 1 != 1ul << (ULONG_WIDTH - 1)
171 # error "ULONG_MAX out of range"
172 # endif
173 #endif
174
175 /* The type of indexes into strings. This is signed, not size_t,
176 since the API requires indexes to fit in regoff_t anyway, and using
177 signed integers makes the code a bit smaller and presumably faster.
178 The traditional GNU regex implementation uses int for indexes.
179 The POSIX-compatible implementation uses a possibly-wider type.
180 The name 'Idx' is three letters to minimize the hassle of
181 reindenting a lot of regex code that formerly used 'int'. */
182 typedef regoff_t Idx;
183 #ifdef _REGEX_LARGE_OFFSETS
184 # define IDX_MAX SSIZE_MAX
185 #else
186 # define IDX_MAX INT_MAX
187 #endif
188
189 /* A hash value, suitable for computing hash tables. */
190 typedef __re_size_t re_hashval_t;
191
192 /* An integer used to represent a set of bits. It must be unsigned,
193 and must be at least as wide as unsigned int. */
194 typedef unsigned long int bitset_word_t;
195 /* All bits set in a bitset_word_t. */
196 #define BITSET_WORD_MAX ULONG_MAX
197 /* Number of bits in a bitset_word_t. */
198 #define BITSET_WORD_BITS ULONG_WIDTH
199
200 /* Number of bitset_word_t values in a bitset_t. */
201 #define BITSET_WORDS ((SBC_MAX + BITSET_WORD_BITS - 1) / BITSET_WORD_BITS)
202
203 typedef bitset_word_t bitset_t[BITSET_WORDS];
204 typedef bitset_word_t *re_bitset_ptr_t;
205 typedef const bitset_word_t *re_const_bitset_ptr_t;
206
207 #define PREV_WORD_CONSTRAINT 0x0001
208 #define PREV_NOTWORD_CONSTRAINT 0x0002
209 #define NEXT_WORD_CONSTRAINT 0x0004
210 #define NEXT_NOTWORD_CONSTRAINT 0x0008
211 #define PREV_NEWLINE_CONSTRAINT 0x0010
212 #define NEXT_NEWLINE_CONSTRAINT 0x0020
213 #define PREV_BEGBUF_CONSTRAINT 0x0040
214 #define NEXT_ENDBUF_CONSTRAINT 0x0080
215 #define WORD_DELIM_CONSTRAINT 0x0100
216 #define NOT_WORD_DELIM_CONSTRAINT 0x0200
217
218 typedef enum
219 {
220 INSIDE_WORD = PREV_WORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
221 WORD_FIRST = PREV_NOTWORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
222 WORD_LAST = PREV_WORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT,
223 INSIDE_NOTWORD = PREV_NOTWORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT,
224 LINE_FIRST = PREV_NEWLINE_CONSTRAINT,
225 LINE_LAST = NEXT_NEWLINE_CONSTRAINT,
226 BUF_FIRST = PREV_BEGBUF_CONSTRAINT,
227 BUF_LAST = NEXT_ENDBUF_CONSTRAINT,
228 WORD_DELIM = WORD_DELIM_CONSTRAINT,
229 NOT_WORD_DELIM = NOT_WORD_DELIM_CONSTRAINT
230 } re_context_type;
231
232 typedef struct
233 {
234 Idx alloc;
235 Idx nelem;
236 Idx *elems;
237 } re_node_set;
238
239 typedef enum
240 {
241 NON_TYPE = 0,
242
243 /* Node type, These are used by token, node, tree. */
244 CHARACTER = 1,
245 END_OF_RE = 2,
246 SIMPLE_BRACKET = 3,
247 OP_BACK_REF = 4,
248 OP_PERIOD = 5,
249 #ifdef RE_ENABLE_I18N
250 COMPLEX_BRACKET = 6,
251 OP_UTF8_PERIOD = 7,
252 #endif /* RE_ENABLE_I18N */
253
254 /* We define EPSILON_BIT as a macro so that OP_OPEN_SUBEXP is used
255 when the debugger shows values of this enum type. */
256 #define EPSILON_BIT 8
257 OP_OPEN_SUBEXP = EPSILON_BIT | 0,
258 OP_CLOSE_SUBEXP = EPSILON_BIT | 1,
259 OP_ALT = EPSILON_BIT | 2,
260 OP_DUP_ASTERISK = EPSILON_BIT | 3,
261 ANCHOR = EPSILON_BIT | 4,
262
263 /* Tree type, these are used only by tree. */
264 CONCAT = 16,
265 SUBEXP = 17,
266
267 /* Token type, these are used only by token. */
268 OP_DUP_PLUS = 18,
269 OP_DUP_QUESTION,
270 OP_OPEN_BRACKET,
271 OP_CLOSE_BRACKET,
272 OP_CHARSET_RANGE,
273 OP_OPEN_DUP_NUM,
274 OP_CLOSE_DUP_NUM,
275 OP_NON_MATCH_LIST,
276 OP_OPEN_COLL_ELEM,
277 OP_CLOSE_COLL_ELEM,
278 OP_OPEN_EQUIV_CLASS,
279 OP_CLOSE_EQUIV_CLASS,
280 OP_OPEN_CHAR_CLASS,
281 OP_CLOSE_CHAR_CLASS,
282 OP_WORD,
283 OP_NOTWORD,
284 OP_SPACE,
285 OP_NOTSPACE,
286 BACK_SLASH
287
288 } re_token_type_t;
289
290 #ifdef RE_ENABLE_I18N
291 typedef struct
292 {
293 /* Multibyte characters. */
294 wchar_t *mbchars;
295
296 /* Collating symbols. */
297 # ifdef _LIBC
298 int32_t *coll_syms;
299 # endif
300
301 /* Equivalence classes. */
302 # ifdef _LIBC
303 int32_t *equiv_classes;
304 # endif
305
306 /* Range expressions. */
307 # ifdef _LIBC
308 uint32_t *range_starts;
309 uint32_t *range_ends;
310 # else /* not _LIBC */
311 wchar_t *range_starts;
312 wchar_t *range_ends;
313 # endif /* not _LIBC */
314
315 /* Character classes. */
316 wctype_t *char_classes;
317
318 /* If this character set is the non-matching list. */
319 unsigned int non_match : 1;
320
321 /* # of multibyte characters. */
322 Idx nmbchars;
323
324 /* # of collating symbols. */
325 Idx ncoll_syms;
326
327 /* # of equivalence classes. */
328 Idx nequiv_classes;
329
330 /* # of range expressions. */
331 Idx nranges;
332
333 /* # of character classes. */
334 Idx nchar_classes;
335 } re_charset_t;
336 #endif /* RE_ENABLE_I18N */
337
338 typedef struct
339 {
340 union
341 {
342 unsigned char c; /* for CHARACTER */
343 re_bitset_ptr_t sbcset; /* for SIMPLE_BRACKET */
344 #ifdef RE_ENABLE_I18N
345 re_charset_t *mbcset; /* for COMPLEX_BRACKET */
346 #endif /* RE_ENABLE_I18N */
347 Idx idx; /* for BACK_REF */
348 re_context_type ctx_type; /* for ANCHOR */
349 } opr;
350 #if (__GNUC__ >= 2 || defined __clang__) && !defined __STRICT_ANSI__
351 re_token_type_t type : 8;
352 #else
353 re_token_type_t type;
354 #endif
355 unsigned int constraint : 10; /* context constraint */
356 unsigned int duplicated : 1;
357 unsigned int opt_subexp : 1;
358 #ifdef RE_ENABLE_I18N
359 unsigned int accept_mb : 1;
360 /* These 2 bits can be moved into the union if needed (e.g. if running out
361 of bits; move opr.c to opr.c.c and move the flags to opr.c.flags). */
362 unsigned int mb_partial : 1;
363 #endif
364 unsigned int word_char : 1;
365 } re_token_t;
366
367 #define IS_EPSILON_NODE(type) ((type) & EPSILON_BIT)
368
369 struct re_string_t
370 {
371 /* Indicate the raw buffer which is the original string passed as an
372 argument of regexec(), re_search(), etc.. */
373 const unsigned char *raw_mbs;
374 /* Store the multibyte string. In case of "case insensitive mode" like
375 REG_ICASE, upper cases of the string are stored, otherwise MBS points
376 the same address that RAW_MBS points. */
377 unsigned char *mbs;
378 #ifdef RE_ENABLE_I18N
379 /* Store the wide character string which is corresponding to MBS. */
380 wint_t *wcs;
381 Idx *offsets;
382 mbstate_t cur_state;
383 #endif
384 /* Index in RAW_MBS. Each character mbs[i] corresponds to
385 raw_mbs[raw_mbs_idx + i]. */
386 Idx raw_mbs_idx;
387 /* The length of the valid characters in the buffers. */
388 Idx valid_len;
389 /* The corresponding number of bytes in raw_mbs array. */
390 Idx valid_raw_len;
391 /* The length of the buffers MBS and WCS. */
392 Idx bufs_len;
393 /* The index in MBS, which is updated by re_string_fetch_byte. */
394 Idx cur_idx;
395 /* length of RAW_MBS array. */
396 Idx raw_len;
397 /* This is RAW_LEN - RAW_MBS_IDX + VALID_LEN - VALID_RAW_LEN. */
398 Idx len;
399 /* End of the buffer may be shorter than its length in the cases such
400 as re_match_2, re_search_2. Then, we use STOP for end of the buffer
401 instead of LEN. */
402 Idx raw_stop;
403 /* This is RAW_STOP - RAW_MBS_IDX adjusted through OFFSETS. */
404 Idx stop;
405
406 /* The context of mbs[0]. We store the context independently, since
407 the context of mbs[0] may be different from raw_mbs[0], which is
408 the beginning of the input string. */
409 unsigned int tip_context;
410 /* The translation passed as a part of an argument of re_compile_pattern. */
411 RE_TRANSLATE_TYPE trans;
412 /* Copy of re_dfa_t's word_char. */
413 re_const_bitset_ptr_t word_char;
414 /* true if REG_ICASE. */
415 unsigned char icase;
416 unsigned char is_utf8;
417 unsigned char map_notascii;
418 unsigned char mbs_allocated;
419 unsigned char offsets_needed;
420 unsigned char newline_anchor;
421 unsigned char word_ops_used;
422 int mb_cur_max;
423 };
424 typedef struct re_string_t re_string_t;
425
426
427 struct re_dfa_t;
428 typedef struct re_dfa_t re_dfa_t;
429
430 #ifndef _LIBC
431 # define IS_IN(libc) false
432 #endif
433
434 #define re_string_peek_byte(pstr, offset) \
435 ((pstr)->mbs[(pstr)->cur_idx + offset])
436 #define re_string_fetch_byte(pstr) \
437 ((pstr)->mbs[(pstr)->cur_idx++])
438 #define re_string_first_byte(pstr, idx) \
439 ((idx) == (pstr)->valid_len || (pstr)->wcs[idx] != WEOF)
440 #define re_string_is_single_byte_char(pstr, idx) \
441 ((pstr)->wcs[idx] != WEOF && ((pstr)->valid_len == (idx) + 1 \
442 || (pstr)->wcs[(idx) + 1] != WEOF))
443 #define re_string_eoi(pstr) ((pstr)->stop <= (pstr)->cur_idx)
444 #define re_string_cur_idx(pstr) ((pstr)->cur_idx)
445 #define re_string_get_buffer(pstr) ((pstr)->mbs)
446 #define re_string_length(pstr) ((pstr)->len)
447 #define re_string_byte_at(pstr,idx) ((pstr)->mbs[idx])
448 #define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx))
449 #define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx))
450
451 #ifdef _LIBC
452 # define MALLOC_0_IS_NONNULL 1
453 #elif !defined MALLOC_0_IS_NONNULL
454 # define MALLOC_0_IS_NONNULL 0
455 #endif
456
457 #ifndef MAX
458 # define MAX(a,b) ((a) < (b) ? (b) : (a))
459 #endif
460 #ifndef MIN
461 # define MIN(a,b) ((a) < (b) ? (a) : (b))
462 #endif
463
464 #define re_malloc(t,n) ((t *) malloc ((n) * sizeof (t)))
465 #define re_realloc(p,t,n) ((t *) realloc (p, (n) * sizeof (t)))
466 #define re_free(p) free (p)
467
468 struct bin_tree_t
469 {
470 struct bin_tree_t *parent;
471 struct bin_tree_t *left;
472 struct bin_tree_t *right;
473 struct bin_tree_t *first;
474 struct bin_tree_t *next;
475
476 re_token_t token;
477
478 /* 'node_idx' is the index in dfa->nodes, if 'type' == 0.
479 Otherwise 'type' indicate the type of this node. */
480 Idx node_idx;
481 };
482 typedef struct bin_tree_t bin_tree_t;
483
484 #define BIN_TREE_STORAGE_SIZE \
485 ((1024 - sizeof (void *)) / sizeof (bin_tree_t))
486
487 struct bin_tree_storage_t
488 {
489 struct bin_tree_storage_t *next;
490 bin_tree_t data[BIN_TREE_STORAGE_SIZE];
491 };
492 typedef struct bin_tree_storage_t bin_tree_storage_t;
493
494 #define CONTEXT_WORD 1
495 #define CONTEXT_NEWLINE (CONTEXT_WORD << 1)
496 #define CONTEXT_BEGBUF (CONTEXT_NEWLINE << 1)
497 #define CONTEXT_ENDBUF (CONTEXT_BEGBUF << 1)
498
499 #define IS_WORD_CONTEXT(c) ((c) & CONTEXT_WORD)
500 #define IS_NEWLINE_CONTEXT(c) ((c) & CONTEXT_NEWLINE)
501 #define IS_BEGBUF_CONTEXT(c) ((c) & CONTEXT_BEGBUF)
502 #define IS_ENDBUF_CONTEXT(c) ((c) & CONTEXT_ENDBUF)
503 #define IS_ORDINARY_CONTEXT(c) ((c) == 0)
504
505 #define IS_WORD_CHAR(ch) (isalnum (ch) || (ch) == '_')
506 #define IS_NEWLINE(ch) ((ch) == NEWLINE_CHAR)
507 #define IS_WIDE_WORD_CHAR(ch) (__iswalnum (ch) || (ch) == L'_')
508 #define IS_WIDE_NEWLINE(ch) ((ch) == WIDE_NEWLINE_CHAR)
509
510 #define NOT_SATISFY_PREV_CONSTRAINT(constraint,context) \
511 ((((constraint) & PREV_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
512 || ((constraint & PREV_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
513 || ((constraint & PREV_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context))\
514 || ((constraint & PREV_BEGBUF_CONSTRAINT) && !IS_BEGBUF_CONTEXT (context)))
515
516 #define NOT_SATISFY_NEXT_CONSTRAINT(constraint,context) \
517 ((((constraint) & NEXT_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
518 || (((constraint) & NEXT_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
519 || (((constraint) & NEXT_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context)) \
520 || (((constraint) & NEXT_ENDBUF_CONSTRAINT) && !IS_ENDBUF_CONTEXT (context)))
521
522 struct re_dfastate_t
523 {
524 re_hashval_t hash;
525 re_node_set nodes;
526 re_node_set non_eps_nodes;
527 re_node_set inveclosure;
528 re_node_set *entrance_nodes;
529 struct re_dfastate_t **trtable, **word_trtable;
530 unsigned int context : 4;
531 unsigned int halt : 1;
532 /* If this state can accept "multi byte".
533 Note that we refer to multibyte characters, and multi character
534 collating elements as "multi byte". */
535 unsigned int accept_mb : 1;
536 /* If this state has backreference node(s). */
537 unsigned int has_backref : 1;
538 unsigned int has_constraint : 1;
539 };
540 typedef struct re_dfastate_t re_dfastate_t;
541
542 struct re_state_table_entry
543 {
544 Idx num;
545 Idx alloc;
546 re_dfastate_t **array;
547 };
548
549 /* Array type used in re_sub_match_last_t and re_sub_match_top_t. */
550
551 typedef struct
552 {
553 Idx next_idx;
554 Idx alloc;
555 re_dfastate_t **array;
556 } state_array_t;
557
558 /* Store information about the node NODE whose type is OP_CLOSE_SUBEXP. */
559
560 typedef struct
561 {
562 Idx node;
563 Idx str_idx; /* The position NODE match at. */
564 state_array_t path;
565 } re_sub_match_last_t;
566
567 /* Store information about the node NODE whose type is OP_OPEN_SUBEXP.
568 And information about the node, whose type is OP_CLOSE_SUBEXP,
569 corresponding to NODE is stored in LASTS. */
570
571 typedef struct
572 {
573 Idx str_idx;
574 Idx node;
575 state_array_t *path;
576 Idx alasts; /* Allocation size of LASTS. */
577 Idx nlasts; /* The number of LASTS. */
578 re_sub_match_last_t **lasts;
579 } re_sub_match_top_t;
580
581 struct re_backref_cache_entry
582 {
583 Idx node;
584 Idx str_idx;
585 Idx subexp_from;
586 Idx subexp_to;
587 bitset_word_t eps_reachable_subexps_map;
588 char more;
589 };
590
591 typedef struct
592 {
593 /* The string object corresponding to the input string. */
594 re_string_t input;
595 const re_dfa_t *const dfa;
596 /* EFLAGS of the argument of regexec. */
597 int eflags;
598 /* Where the matching ends. */
599 Idx match_last;
600 Idx last_node;
601 /* The state log used by the matcher. */
602 re_dfastate_t **state_log;
603 Idx state_log_top;
604 /* Back reference cache. */
605 Idx nbkref_ents;
606 Idx abkref_ents;
607 struct re_backref_cache_entry *bkref_ents;
608 int max_mb_elem_len;
609 Idx nsub_tops;
610 Idx asub_tops;
611 re_sub_match_top_t **sub_tops;
612 } re_match_context_t;
613
614 typedef struct
615 {
616 re_dfastate_t **sifted_states;
617 re_dfastate_t **limited_states;
618 Idx last_node;
619 Idx last_str_idx;
620 re_node_set limits;
621 } re_sift_context_t;
622
623 struct re_fail_stack_ent_t
624 {
625 Idx idx;
626 Idx node;
627 regmatch_t *regs;
628 re_node_set eps_via_nodes;
629 };
630
631 struct re_fail_stack_t
632 {
633 Idx num;
634 Idx alloc;
635 struct re_fail_stack_ent_t *stack;
636 };
637
638 struct re_dfa_t
639 {
640 re_token_t *nodes;
641 size_t nodes_alloc;
642 size_t nodes_len;
643 Idx *nexts;
644 Idx *org_indices;
645 re_node_set *edests;
646 re_node_set *eclosures;
647 re_node_set *inveclosures;
648 struct re_state_table_entry *state_table;
649 re_dfastate_t *init_state;
650 re_dfastate_t *init_state_word;
651 re_dfastate_t *init_state_nl;
652 re_dfastate_t *init_state_begbuf;
653 bin_tree_t *str_tree;
654 bin_tree_storage_t *str_tree_storage;
655 re_bitset_ptr_t sb_char;
656 int str_tree_storage_idx;
657
658 /* number of subexpressions 're_nsub' is in regex_t. */
659 re_hashval_t state_hash_mask;
660 Idx init_node;
661 Idx nbackref; /* The number of backreference in this dfa. */
662
663 /* Bitmap expressing which backreference is used. */
664 bitset_word_t used_bkref_map;
665 bitset_word_t completed_bkref_map;
666
667 unsigned int has_plural_match : 1;
668 /* If this dfa has "multibyte node", which is a backreference or
669 a node which can accept multibyte character or multi character
670 collating element. */
671 unsigned int has_mb_node : 1;
672 unsigned int is_utf8 : 1;
673 unsigned int map_notascii : 1;
674 unsigned int word_ops_used : 1;
675 int mb_cur_max;
676 bitset_t word_char;
677 reg_syntax_t syntax;
678 Idx *subexp_map;
679 #ifdef DEBUG
680 char* re_str;
681 #endif
682 lock_define (lock)
683 };
684
685 #define re_node_set_init_empty(set) memset (set, '\0', sizeof (re_node_set))
686 #define re_node_set_remove(set,id) \
687 (re_node_set_remove_at (set, re_node_set_contains (set, id) - 1))
688 #define re_node_set_empty(p) ((p)->nelem = 0)
689 #define re_node_set_free(set) re_free ((set)->elems)
690
691
692 typedef enum
693 {
694 SB_CHAR,
695 MB_CHAR,
696 EQUIV_CLASS,
697 COLL_SYM,
698 CHAR_CLASS
699 } bracket_elem_type;
700
701 typedef struct
702 {
703 bracket_elem_type type;
704 union
705 {
706 unsigned char ch;
707 unsigned char *name;
708 wchar_t wch;
709 } opr;
710 } bracket_elem_t;
711
712
713 /* Functions for bitset_t operation. */
714
715 static inline void
bitset_set(bitset_t set,Idx i)716 bitset_set (bitset_t set, Idx i)
717 {
718 set[i / BITSET_WORD_BITS] |= (bitset_word_t) 1 << i % BITSET_WORD_BITS;
719 }
720
721 static inline void
bitset_clear(bitset_t set,Idx i)722 bitset_clear (bitset_t set, Idx i)
723 {
724 set[i / BITSET_WORD_BITS] &= ~ ((bitset_word_t) 1 << i % BITSET_WORD_BITS);
725 }
726
727 static inline bool
bitset_contain(const bitset_t set,Idx i)728 bitset_contain (const bitset_t set, Idx i)
729 {
730 return (set[i / BITSET_WORD_BITS] >> i % BITSET_WORD_BITS) & 1;
731 }
732
733 static inline void
bitset_empty(bitset_t set)734 bitset_empty (bitset_t set)
735 {
736 memset (set, '\0', sizeof (bitset_t));
737 }
738
739 static inline void
bitset_set_all(bitset_t set)740 bitset_set_all (bitset_t set)
741 {
742 memset (set, -1, sizeof (bitset_word_t) * (SBC_MAX / BITSET_WORD_BITS));
743 if (SBC_MAX % BITSET_WORD_BITS != 0)
744 set[BITSET_WORDS - 1] =
745 ((bitset_word_t) 1 << SBC_MAX % BITSET_WORD_BITS) - 1;
746 }
747
748 static inline void
bitset_copy(bitset_t dest,const bitset_t src)749 bitset_copy (bitset_t dest, const bitset_t src)
750 {
751 memcpy (dest, src, sizeof (bitset_t));
752 }
753
754 static inline void
bitset_not(bitset_t set)755 bitset_not (bitset_t set)
756 {
757 int bitset_i;
758 for (bitset_i = 0; bitset_i < SBC_MAX / BITSET_WORD_BITS; ++bitset_i)
759 set[bitset_i] = ~set[bitset_i];
760 if (SBC_MAX % BITSET_WORD_BITS != 0)
761 set[BITSET_WORDS - 1] =
762 ((((bitset_word_t) 1 << SBC_MAX % BITSET_WORD_BITS) - 1)
763 & ~set[BITSET_WORDS - 1]);
764 }
765
766 static inline void
bitset_merge(bitset_t dest,const bitset_t src)767 bitset_merge (bitset_t dest, const bitset_t src)
768 {
769 int bitset_i;
770 for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i)
771 dest[bitset_i] |= src[bitset_i];
772 }
773
774 static inline void
bitset_mask(bitset_t dest,const bitset_t src)775 bitset_mask (bitset_t dest, const bitset_t src)
776 {
777 int bitset_i;
778 for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i)
779 dest[bitset_i] &= src[bitset_i];
780 }
781
782 #ifdef RE_ENABLE_I18N
783 /* Functions for re_string. */
784 static int
785 __attribute__ ((pure, unused))
re_string_char_size_at(const re_string_t * pstr,Idx idx)786 re_string_char_size_at (const re_string_t *pstr, Idx idx)
787 {
788 int byte_idx;
789 if (pstr->mb_cur_max == 1)
790 return 1;
791 for (byte_idx = 1; idx + byte_idx < pstr->valid_len; ++byte_idx)
792 if (pstr->wcs[idx + byte_idx] != WEOF)
793 break;
794 return byte_idx;
795 }
796
797 static wint_t
798 __attribute__ ((pure, unused))
re_string_wchar_at(const re_string_t * pstr,Idx idx)799 re_string_wchar_at (const re_string_t *pstr, Idx idx)
800 {
801 if (pstr->mb_cur_max == 1)
802 return (wint_t) pstr->mbs[idx];
803 return (wint_t) pstr->wcs[idx];
804 }
805
806 # ifdef _LIBC
807 # include <locale/weight.h>
808 # endif
809
810 static int
811 __attribute__ ((pure, unused))
re_string_elem_size_at(const re_string_t * pstr,Idx idx)812 re_string_elem_size_at (const re_string_t *pstr, Idx idx)
813 {
814 # ifdef _LIBC
815 const unsigned char *p, *extra;
816 const int32_t *table, *indirect;
817 uint_fast32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
818
819 if (nrules != 0)
820 {
821 table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
822 extra = (const unsigned char *)
823 _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB);
824 indirect = (const int32_t *) _NL_CURRENT (LC_COLLATE,
825 _NL_COLLATE_INDIRECTMB);
826 p = pstr->mbs + idx;
827 findidx (table, indirect, extra, &p, pstr->len - idx);
828 return p - pstr->mbs - idx;
829 }
830 else
831 # endif /* _LIBC */
832 return 1;
833 }
834 #endif /* RE_ENABLE_I18N */
835
836 #ifdef _LIBC
837 # if __GNUC__ >= 7
838 # define FALLTHROUGH __attribute__ ((__fallthrough__))
839 # else
840 # define FALLTHROUGH ((void) 0)
841 # endif
842 #else
843 # include "attribute.h"
844 #endif
845
846 #endif /* _REGEX_INTERNAL_H */
847