aboutsummaryrefslogtreecommitdiff
path: root/posix/regex_internal.h
blob: 75cc81517b0889ddcfdb60d3b60826ae4c7e5235 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
/* Extended regular expression matching and search library.
   Copyright (C) 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _REGEX_INTERNAL_H
#define _REGEX_INTERNAL_H 1

/* Number of bits in a byte.  */
#define BYTE_BITS 8
/* Number of single byte character.  */
#define SBC_MAX 256

#define COLL_ELEM_LEN_MAX 8

/* The character which represents newline.  */
#define NEWLINE_CHAR '\n'

/* Rename to standard API for using out of glibc.  */
#ifndef _LIBC
# define __wctype wctype
# define __iswctype iswctype
# define __btowc btowc
# define __mempcpy memcpy
# define attribute_hidden
#endif /* not _LIBC */

extern const char __re_error_msgid[] attribute_hidden;
extern const size_t __re_error_msgid_idx[] attribute_hidden;

/* Number of bits in an unsinged int.  */
#define UINT_BITS (sizeof (unsigned int) * BYTE_BITS)
/* Number of unsigned int in an bit_set.  */
#define BITSET_UINTS ((SBC_MAX + UINT_BITS - 1) / UINT_BITS)
typedef unsigned int bitset[BITSET_UINTS];
typedef unsigned int *re_bitset_ptr_t;

#define bitset_set(set,i) (set[i / UINT_BITS] |= 1 << i % UINT_BITS)
#define bitset_clear(set,i) (set[i / UINT_BITS] &= ~(1 << i % UINT_BITS))
#define bitset_contain(set,i) (set[i / UINT_BITS] & (1 << i % UINT_BITS))
#define bitset_empty(set) memset (set, 0, sizeof (unsigned int) * BITSET_UINTS)
#define bitset_set_all(set) \
  memset (set, 255, sizeof (unsigned int) * BITSET_UINTS)
#define bitset_copy(dest,src) \
  memcpy (dest, src, sizeof (unsigned int) * BITSET_UINTS)
static inline void bitset_not (bitset set);
static inline void bitset_merge (bitset dest, const bitset src);
static inline void bitset_not_merge (bitset dest, const bitset src);

#define PREV_WORD_CONSTRAINT 0x0001
#define PREV_NOTWORD_CONSTRAINT 0x0002
#define NEXT_WORD_CONSTRAINT 0x0004
#define NEXT_NOTWORD_CONSTRAINT 0x0008
#define PREV_NEWLINE_CONSTRAINT 0x0010
#define NEXT_NEWLINE_CONSTRAINT 0x0020
#define PREV_BEGBUF_CONSTRAINT 0x0040
#define NEXT_ENDBUF_CONSTRAINT 0x0080
#define DUMMY_CONSTRAINT 0x0100

typedef enum
{
  INSIDE_WORD = PREV_WORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
  WORD_FIRST = PREV_NOTWORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
  WORD_LAST = PREV_WORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT,
  LINE_FIRST = PREV_NEWLINE_CONSTRAINT,
  LINE_LAST = NEXT_NEWLINE_CONSTRAINT,
  BUF_FIRST = PREV_BEGBUF_CONSTRAINT,
  BUF_LAST = NEXT_ENDBUF_CONSTRAINT,
  WORD_DELIM = DUMMY_CONSTRAINT
} re_context_type;

typedef struct
{
  int alloc;
  int nelem;
  int *elems;
} re_node_set;

typedef enum
{
  NON_TYPE = 0,

  /* Token type, these are used only by token.  */
  OP_OPEN_SUBEXP,
  OP_CLOSE_SUBEXP,
  OP_OPEN_BRACKET,
  OP_CLOSE_BRACKET,
  OP_CHARSET_RANGE,
  OP_OPEN_DUP_NUM,
  OP_CLOSE_DUP_NUM,
  OP_NON_MATCH_LIST,
  OP_OPEN_COLL_ELEM,
  OP_CLOSE_COLL_ELEM,
  OP_OPEN_EQUIV_CLASS,
  OP_CLOSE_EQUIV_CLASS,
  OP_OPEN_CHAR_CLASS,
  OP_CLOSE_CHAR_CLASS,
  OP_WORD,
  OP_NOTWORD,
  BACK_SLASH,

  /* Tree type, these are used only by tree. */
  CONCAT,
  ALT,
  SUBEXP,
  SIMPLE_BRACKET,
  COMPLEX_BRACKET,

  /* Node type, These are used by token, node, tree.  */
  OP_PERIOD,
  CHARACTER,
  END_OF_RE,
  OP_ALT,
  OP_DUP_ASTERISK,
  OP_DUP_PLUS,
  OP_DUP_QUESTION,
  OP_BACK_REF,
  ANCHOR,
  OP_CONTEXT_NODE,

  /* Dummy marker.  */
  END_OF_RE_TOKEN_T
} re_token_type_t;

typedef struct
{
  /* If this character set is the non-matching list.  */
  unsigned int non_match : 1;

  /* Multibyte characters.  */
  wchar_t *mbchars;
  int nmbchars;

  /* Collating symbols.  */
#ifdef _LIBC
  int32_t *coll_syms;
#endif
  int ncoll_syms;

  /* Equivalence classes. */
#ifdef _LIBC
  int32_t *equiv_classes;
#endif
  int nequiv_classes;

  /* Range expressions. */
#ifdef _LIBC
  uint32_t *range_starts;
  uint32_t *range_ends;
#else /* not _LIBC */
  wchar_t *range_starts;
  wchar_t *range_ends;
#endif /* not _LIBC */
  int nranges;

  /* Character classes. */
  wctype_t *char_classes;
  int nchar_classes;
} re_charset_t;

typedef struct
{
  re_token_type_t type;
  union
  {
    unsigned char c;		/* for CHARACTER */
    re_bitset_ptr_t sbcset;	/* for SIMPLE_BRACKET */
    re_charset_t *mbcset;	/* for COMPLEX_BRACKET */
    int idx;			/* for BACK_REF */
    re_context_type ctx_type;	/* for ANCHOR */
    struct
    {
      int entity;		/* for OP_CONTEXT_NODE, index of the entity */
      re_node_set *bkref_eclosure;
    } *ctx_info;
  } opr;
  unsigned int constraint : 10;	/* context constraint */
  unsigned int duplicated : 1;
#ifdef RE_ENABLE_I18N
  unsigned int mb_partial : 1;
#endif
} re_token_t;

#define IS_EPSILON_NODE(type) \
  ((type) == OP_ALT || (type) == OP_DUP_ASTERISK || (type) == OP_DUP_PLUS || \
   (type) == OP_DUP_QUESTION || (type) == ANCHOR)

#define ACCEPT_MB_NODE(type) \
  ((type) == COMPLEX_BRACKET || (type) == OP_PERIOD)

struct re_string_t
{
  /* Indicate the raw buffer which is the original string passed as an
     argument of regexec(), re_search(), etc..  */
  const unsigned char *raw_mbs;
  /* Index in RAW_MBS.  Each character mbs[i] corresponds to
     raw_mbs[raw_mbs_idx + i].  */
  int raw_mbs_idx;
  /* Store the multibyte string.  In case of "case insensitive mode" like
     REG_ICASE, upper cases of the string are stored, otherwise MBS points
     the same address that RAW_MBS points.  */
  unsigned char *mbs;
  /* Store the case sensitive multibyte string.  In case of
     "case insensitive mode", the original string are stored,
     otherwise MBS_CASE points the same address that MBS points.  */
  unsigned char *mbs_case;
#ifdef RE_ENABLE_I18N
  /* Store the wide character string which is corresponding to MBS.  */
  wchar_t *wcs;
  mbstate_t cur_state;
#endif
  /* The length of the valid characters in the buffers.  */
  int valid_len;
  /* The length of the buffers MBS, MBS_CASE, and WCS.  */
  int bufs_len;
  /* The index in MBS, which is updated by re_string_fetch_byte.  */
  int cur_idx;
  /* This is length_of_RAW_MBS - RAW_MBS_IDX.  */
  int len;
  /* The context of mbs[0].  We store the context independently, since
     the context of mbs[0] may be different from raw_mbs[0], which is
     the beginning of the input string.  */
  unsigned int tip_context;
  /* The translation passed as a part of an argument of re_compile_pattern.  */
  RE_TRANSLATE_TYPE trans;
  /* 1 if REG_ICASE.  */
  unsigned int icase : 1;
};
typedef struct re_string_t re_string_t;
/* In case of REG_ICASE, we allocate the buffer dynamically for mbs.  */
#define MBS_ALLOCATED(pstr) (pstr->icase)
/* In case that we need translation, we allocate the buffer dynamically
   for mbs_case.  Note that mbs == mbs_case if not REG_ICASE.  */
#define MBS_CASE_ALLOCATED(pstr) (pstr->trans != NULL)


static reg_errcode_t re_string_allocate (re_string_t *pstr,
                                         const unsigned char *str, int len,
                                         int init_len,
                                         RE_TRANSLATE_TYPE trans, int icase);
static reg_errcode_t re_string_construct (re_string_t *pstr,
					  const unsigned char *str, int len,
                                          RE_TRANSLATE_TYPE trans, int icase);
static reg_errcode_t re_string_reconstruct (re_string_t *pstr, int idx,
                                            int eflags, int newline);
static reg_errcode_t re_string_realloc_buffers (re_string_t *pstr,
                                                int new_buf_len);
#ifdef RE_ENABLE_I18N
static void build_wcs_buffer (re_string_t *pstr);
static void build_wcs_upper_buffer (re_string_t *pstr);
#endif /* RE_ENABLE_I18N */
static void build_upper_buffer (re_string_t *pstr);
static void re_string_translate_buffer (re_string_t *pstr);
static void re_string_destruct (re_string_t *pstr);
#ifdef RE_ENABLE_I18N
static int re_string_elem_size_at (const re_string_t *pstr, int idx);
static inline int re_string_char_size_at (const re_string_t *pstr, int idx);
static inline wint_t re_string_wchar_at (const re_string_t *pstr, int idx);
#endif /* RE_ENABLE_I18N */
static unsigned int re_string_context_at (const re_string_t *input, int idx,
					  int eflags, int newline_anchor);
#define re_string_peek_byte(pstr, offset) \
  ((pstr)->mbs[(pstr)->cur_idx + offset])
#define re_string_peek_byte_case(pstr, offset) \
  ((pstr)->mbs_case[(pstr)->cur_idx + offset])
#define re_string_fetch_byte(pstr) \
  ((pstr)->mbs[(pstr)->cur_idx++])
#define re_string_fetch_byte_case(pstr) \
  ((pstr)->mbs_case[(pstr)->cur_idx++])
#define re_string_first_byte(pstr, idx) \
  ((idx) == (pstr)->len || (pstr)->wcs[idx] != WEOF)
#define re_string_is_single_byte_char(pstr, idx) \
  ((pstr)->wcs[idx] != WEOF && ((pstr)->len == (idx) \
                                || (pstr)->wcs[(idx) + 1] != WEOF))
#define re_string_eoi(pstr) ((pstr)->len == (pstr)->cur_idx)
#define re_string_cur_idx(pstr) ((pstr)->cur_idx)
#define re_string_get_buffer(pstr) ((pstr)->mbs)
#define re_string_length(pstr) ((pstr)->len)
#define re_string_byte_at(pstr,idx) ((pstr)->mbs[idx])
#define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx))
#define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx))

#define re_malloc(t,n) ((t *) malloc ((n) * sizeof (t)))
#define re_realloc(p,t,n) ((t *) realloc (p, (n) * sizeof (t)))
#define re_free(p) free (p)

struct bin_tree_t
{
  struct bin_tree_t *parent;
  struct bin_tree_t *left;
  struct bin_tree_t *right;

  /* `node_idx' is the index in dfa->nodes, if `type' == 0.
     Otherwise `type' indicate the type of this node.  */
  re_token_type_t type;
  int node_idx;

  int first;
  int next;
  re_node_set eclosure;
};
typedef struct bin_tree_t bin_tree_t;


#define CONTEXT_WORD 1
#define CONTEXT_NEWLINE (CONTEXT_WORD << 1)
#define CONTEXT_BEGBUF (CONTEXT_NEWLINE << 1)
#define CONTEXT_ENDBUF (CONTEXT_BEGBUF << 1)

#define IS_WORD_CONTEXT(c) ((c) & CONTEXT_WORD)
#define IS_NEWLINE_CONTEXT(c) ((c) & CONTEXT_NEWLINE)
#define IS_BEGBUF_CONTEXT(c) ((c) & CONTEXT_BEGBUF)
#define IS_ENDBUF_CONTEXT(c) ((c) & CONTEXT_ENDBUF)
#define IS_ORDINARY_CONTEXT(c) ((c) == 0)

#define IS_WORD_CHAR(ch) (isalnum (ch) || (ch) == '_')
#define IS_NEWLINE(ch) ((ch) == NEWLINE_CHAR)

#define NOT_SATISFY_PREV_CONSTRAINT(constraint,context) \
 ((((constraint) & PREV_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
  || ((constraint & PREV_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
  || ((constraint & PREV_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context))\
  || ((constraint & PREV_BEGBUF_CONSTRAINT) && !IS_BEGBUF_CONTEXT (context)))

#define NOT_SATISFY_NEXT_CONSTRAINT(constraint,context) \
 ((((constraint) & NEXT_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
  || (((constraint) & NEXT_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
  || (((constraint) & NEXT_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context)) \
  || (((constraint) & NEXT_ENDBUF_CONSTRAINT) && !IS_ENDBUF_CONTEXT (context)))

struct re_dfastate_t
{
  unsigned int hash;
  re_node_set nodes;
  re_node_set *entrance_nodes;
  struct re_dfastate_t **trtable;
  struct re_dfastate_t **trtable_search;
  /* If this state is a special state.
     A state is a special state if the state is the halt state, or
     a anchor.  */
  unsigned int context : 2;
  unsigned int halt : 1;
  /* If this state can accept `multi byte'.
     Note that we refer to multibyte characters, and multi character
     collating elements as `multi byte'.  */
  unsigned int accept_mb : 1;
  /* If this state has backreference node(s).  */
  unsigned int has_backref : 1;
  unsigned int has_constraint : 1;
};
typedef struct re_dfastate_t re_dfastate_t;

typedef struct
{
  /* start <= node < end  */
  int start;
  int end;
} re_subexp_t;

struct re_state_table_entry
{
  int num;
  int alloc;
  re_dfastate_t **array;
};

struct re_backref_cache_entry
{
  int node;
  int from;
  int to;
  int flag;
};

typedef struct
{
  /* EFLAGS of the argument of regexec.  */
  int eflags;
  /* Where the matching ends.  */
  int match_last;
  /* The string object corresponding to the input string.  */
  re_string_t *input;
  /* The state log used by the matcher.  */
  re_dfastate_t **state_log;
  int state_log_top;
  /* Back reference cache.  */
  int nbkref_ents;
  int abkref_ents;
  struct re_backref_cache_entry *bkref_ents;
  int max_bkref_len;
} re_match_context_t;

struct re_dfa_t
{
  re_bitset_ptr_t word_char;

  /* number of subexpressions `re_nsub' is in regex_t.  */
  int subexps_alloc;
  re_subexp_t *subexps;

  re_token_t *nodes;
  int nodes_alloc;
  int nodes_len;
  bin_tree_t *str_tree;
  int *firsts;
  int *nexts;
  re_node_set *edests;
  re_node_set *eclosures;
  re_node_set *inveclosures;
  struct re_state_table_entry *state_table;
  unsigned int state_hash_mask;
  re_dfastate_t *init_state;
  re_dfastate_t *init_state_word;
  re_dfastate_t *init_state_nl;
  re_dfastate_t *init_state_begbuf;
  int states_alloc;
  int init_node;
  int nbackref; /* The number of backreference in this dfa.  */
  /* If this dfa has "multibyte node", which is a backreference or
     a node which can accept multibyte character or multi character
     collating element.  */
  unsigned int has_mb_node : 1;
};
typedef struct re_dfa_t re_dfa_t;

static reg_errcode_t re_node_set_alloc (re_node_set *set, int size);
static reg_errcode_t re_node_set_init_1 (re_node_set *set, int elem);
static reg_errcode_t re_node_set_init_2 (re_node_set *set, int elem1,
                                         int elem2);
#define re_node_set_init_empty(set) memset (set, '\0', sizeof (re_node_set))
static reg_errcode_t re_node_set_init_copy (re_node_set *dest,
                                            const re_node_set *src);
static reg_errcode_t re_node_set_intersect (re_node_set *dest,
                                            const re_node_set *src1,
                                            const re_node_set *src2);
static reg_errcode_t re_node_set_add_intersect (re_node_set *dest,
                                                const re_node_set *src1,
                                                const re_node_set *src2);
static reg_errcode_t re_node_set_init_union (re_node_set *dest,
                                             const re_node_set *src1,
                                             const re_node_set *src2);
static reg_errcode_t re_node_set_merge (re_node_set *dest,
                                        const re_node_set *src);
static int re_node_set_insert (re_node_set *set, int elem);
static int re_node_set_compare (const re_node_set *set1,
                                const re_node_set *set2);
static int re_node_set_contains (const re_node_set *set, int elem);
static void re_node_set_remove_at (re_node_set *set, int idx);
#define re_node_set_empty(p) ((p)->nelem = 0)
#define re_node_set_free(set) re_free ((set)->elems)
static int re_dfa_add_node (re_dfa_t *dfa, re_token_t token, int mode);
static re_dfastate_t *re_acquire_state (reg_errcode_t *err, re_dfa_t *dfa,
                                        const re_node_set *nodes);
static re_dfastate_t *re_acquire_state_context (reg_errcode_t *err,
                                                re_dfa_t *dfa,
                                                const re_node_set *nodes,
                                                unsigned int context);


typedef enum
{
  SB_CHAR,
  MB_CHAR,
  EQUIV_CLASS,
  COLL_SYM,
  CHAR_CLASS
} bracket_elem_type;

typedef struct
{
  bracket_elem_type type;
  union
  {
    unsigned char ch;
    unsigned char *name;
    wchar_t wch;
  } opr;
} bracket_elem_t;


/* Inline functions for bitset operation.  */
static inline void
bitset_not (set)
     bitset set;
{
  int bitset_i;
  for (bitset_i = 0; bitset_i < BITSET_UINTS; ++bitset_i)
    set[bitset_i] = ~set[bitset_i];
}

static inline void
bitset_merge (dest, src)
     bitset dest;
     const bitset src;
{
  int bitset_i;
  for (bitset_i = 0; bitset_i < BITSET_UINTS; ++bitset_i)
    dest[bitset_i] |= src[bitset_i];
}

static inline void
bitset_not_merge (dest, src)
     bitset dest;
     const bitset src;
{
  int i;
  for (i = 0; i < BITSET_UINTS; ++i)
    dest[i] |= ~src[i];
}

#ifdef RE_ENABLE_I18N
/* Inline functions for re_string.  */
static inline int
re_string_char_size_at (pstr, idx)
     const re_string_t *pstr;
     int idx;
{
  int byte_idx;
  if (MB_CUR_MAX == 1)
    return 1;
  for (byte_idx = 1; idx + byte_idx < pstr->len; ++byte_idx)
    if (pstr->wcs[idx + byte_idx] != WEOF)
      break;
  return byte_idx;
}

static inline wint_t
re_string_wchar_at (pstr, idx)
     const re_string_t *pstr;
     int idx;
{
  if (MB_CUR_MAX == 1)
    return (wint_t) pstr->mbs[idx];
  return (wint_t) pstr->wcs[idx];
}

static int
re_string_elem_size_at (pstr, idx)
     const re_string_t *pstr;
     int idx;
{
#ifdef _LIBC
  const unsigned char *p;
  const char *extra;
  const int32_t *table, *indirect;
  int32_t tmp;
# include <locale/weight.h>
  uint_fast32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);

  if (nrules != 0)
    {
      table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
      extra = (const char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB);
      indirect = (const int32_t *) _NL_CURRENT (LC_COLLATE,
						_NL_COLLATE_INDIRECTMB);
      p = pstr->mbs + idx;
      tmp = findidx (&p);
      return p - (const unsigned char *) pstr->mbs - idx;
    }
  else
#endif /* _LIBC */
    return 1;
}
#endif /* RE_ENABLE_I18N */

#endif /*  _REGEX_INTERNAL_H */