posix/regex_internal.h

   1 /* Extended regular expression matching and search library.
   2    Copyright (C) 2002-2016 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 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _REGEX_INTERNAL_H
  21 #define _REGEX_INTERNAL_H 1
  22
  23 #include <assert.h>
  24 #include <ctype.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #if defined HAVE_LANGINFO_H || defined HAVE_LANGINFO_CODESET || defined _LIBC
  30 # include <langinfo.h>
  31 #endif
  32 #if defined HAVE_LOCALE_H || defined _LIBC
  33 # include <locale.h>
  34 #endif
  35 #if defined HAVE_WCHAR_H || defined _LIBC
  36 # include <wchar.h>
  37 #endif /* HAVE_WCHAR_H || _LIBC */
  38 #if defined HAVE_WCTYPE_H || defined _LIBC
  39 # include <wctype.h>
  40 #endif /* HAVE_WCTYPE_H || _LIBC */
  41 #if defined HAVE_STDBOOL_H || defined _LIBC
  42 # include <stdbool.h>
  43 #endif /* HAVE_STDBOOL_H || _LIBC */
  44 #if defined HAVE_STDINT_H || defined _LIBC
  45 # include <stdint.h>
  46 #endif /* HAVE_STDINT_H || _LIBC */
  47 #if defined _LIBC
  48 # include <libc-lock.h>
  49 #else
  50 # define __libc_lock_define(CLASS,NAME)
  51 # define __libc_lock_init(NAME) do { } while (0)
  52 # define __libc_lock_lock(NAME) do { } while (0)
  53 # define __libc_lock_unlock(NAME) do { } while (0)
  54 #endif
  55
  56 /* In case that the system doesn't have isblank().  */
  57 #if !defined _LIBC && !defined HAVE_ISBLANK && !defined isblank
  58 # define isblank(ch) ((ch) == ' ' || (ch) == '\t')
  59 #endif
  60
  61 #ifdef _LIBC
  62 # ifndef _RE_DEFINE_LOCALE_FUNCTIONS
  63 #  define _RE_DEFINE_LOCALE_FUNCTIONS 1
  64 #   include <locale/localeinfo.h>
  65 #   include <locale/coll-lookup.h>
  66 # endif
  67 #endif
  68
  69 /* This is for other GNU distributions with internationalized messages.  */
  70 #if (HAVE_LIBINTL_H && ENABLE_NLS) || defined _LIBC
  71 # include <libintl.h>
  72 # ifdef _LIBC
  73 #  undef gettext
  74 #  define gettext(msgid) \
  75   __dcgettext (_libc_intl_domainname, msgid, LC_MESSAGES)
  76 # endif
  77 #else
  78 # define gettext(msgid) (msgid)
  79 #endif
  80
  81 #ifndef gettext_noop
  82 /* This define is so xgettext can find the internationalizable
  83    strings.  */
  84 # define gettext_noop(String) String
  85 #endif
  86
  87 /* For loser systems without the definition.  */
  88 #ifndef SIZE_MAX
  89 # define SIZE_MAX ((size_t) -1)
  90 #endif
  91
  92 #if (defined MB_CUR_MAX && HAVE_WCTYPE_H && HAVE_ISWCTYPE) || _LIBC
  93 # define RE_ENABLE_I18N
  94 #endif
  95
  96 #if __GNUC__ >= 3
  97 # define BE(expr, val) __builtin_expect (expr, val)
  98 #else
  99 # define BE(expr, val) (expr)
 100 #endif
 101
 102 /* Number of single byte character.  */
 103 #define SBC_MAX 256
 104
 105 #define COLL_ELEM_LEN_MAX 8
 106
 107 /* The character which represents newline.  */
 108 #define NEWLINE_CHAR '\n'
 109 #define WIDE_NEWLINE_CHAR L'\n'
 110
 111 /* Rename to standard API for using out of glibc.  */
 112 #ifndef _LIBC
 113 # define __wctype wctype
 114 # define __iswctype iswctype
 115 # define __btowc btowc
 116 # define __mbrtowc mbrtowc
 117 # define __mempcpy mempcpy
 118 # define __wcrtomb wcrtomb
 119 # define __regfree regfree
 120 # define attribute_hidden
 121 #endif /* not _LIBC */
 122
 123 #if __GNUC__ < 3 + (__GNUC_MINOR__ < 1)
 124 # define __attribute__(arg)
 125 #endif
 126
 127 extern const char __re_error_msgid[] attribute_hidden;
 128 extern const size_t __re_error_msgid_idx[] attribute_hidden;
 129
 130 /* An integer used to represent a set of bits.  It must be unsigned,
 131    and must be at least as wide as unsigned int.  */
 132 typedef unsigned long int bitset_word_t;
 133 /* All bits set in a bitset_word_t.  */
 134 #define BITSET_WORD_MAX ULONG_MAX
 135 /* Number of bits in a bitset_word_t.  */
 136 #define BITSET_WORD_BITS (sizeof (bitset_word_t) * CHAR_BIT)
 137 /* Number of bitset_word_t in a bit_set.  */
 138 #define BITSET_WORDS (SBC_MAX / BITSET_WORD_BITS)
 139 typedef bitset_word_t bitset_t[BITSET_WORDS];
 140 typedef bitset_word_t *re_bitset_ptr_t;
 141 typedef const bitset_word_t *re_const_bitset_ptr_t;
 142
 143 #define bitset_set(set,i) \
 144   (set[i / BITSET_WORD_BITS] |= (bitset_word_t) 1 << i % BITSET_WORD_BITS)
 145 #define bitset_clear(set,i) \
 146   (set[i / BITSET_WORD_BITS] &= ~((bitset_word_t) 1 << i % BITSET_WORD_BITS))
 147 #define bitset_contain(set,i) \
 148   (set[i / BITSET_WORD_BITS] & ((bitset_word_t) 1 << i % BITSET_WORD_BITS))
 149 #define bitset_empty(set) memset (set, '\0', sizeof (bitset_t))
 150 #define bitset_set_all(set) memset (set, '\xff', sizeof (bitset_t))
 151 #define bitset_copy(dest,src) memcpy (dest, src, sizeof (bitset_t))
 152
 153 #define PREV_WORD_CONSTRAINT 0x0001
 154 #define PREV_NOTWORD_CONSTRAINT 0x0002
 155 #define NEXT_WORD_CONSTRAINT 0x0004
 156 #define NEXT_NOTWORD_CONSTRAINT 0x0008
 157 #define PREV_NEWLINE_CONSTRAINT 0x0010
 158 #define NEXT_NEWLINE_CONSTRAINT 0x0020
 159 #define PREV_BEGBUF_CONSTRAINT 0x0040
 160 #define NEXT_ENDBUF_CONSTRAINT 0x0080
 161 #define WORD_DELIM_CONSTRAINT 0x0100
 162 #define NOT_WORD_DELIM_CONSTRAINT 0x0200
 163
 164 typedef enum
 165 {
 166   INSIDE_WORD = PREV_WORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
 167   WORD_FIRST = PREV_NOTWORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
 168   WORD_LAST = PREV_WORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT,
 169   INSIDE_NOTWORD = PREV_NOTWORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT,
 170   LINE_FIRST = PREV_NEWLINE_CONSTRAINT,
 171   LINE_LAST = NEXT_NEWLINE_CONSTRAINT,
 172   BUF_FIRST = PREV_BEGBUF_CONSTRAINT,
 173   BUF_LAST = NEXT_ENDBUF_CONSTRAINT,
 174   WORD_DELIM = WORD_DELIM_CONSTRAINT,
 175   NOT_WORD_DELIM = NOT_WORD_DELIM_CONSTRAINT
 176 } re_context_type;
 177
 178 typedef struct
 179 {
 180   int alloc;
 181   int nelem;
 182   int *elems;
 183 } re_node_set;
 184
 185 typedef enum
 186 {
 187   NON_TYPE = 0,
 188
 189   /* Node type, These are used by token, node, tree.  */
 190   CHARACTER = 1,
 191   END_OF_RE = 2,
 192   SIMPLE_BRACKET = 3,
 193   OP_BACK_REF = 4,
 194   OP_PERIOD = 5,
 195 #ifdef RE_ENABLE_I18N
 196   COMPLEX_BRACKET = 6,
 197   OP_UTF8_PERIOD = 7,
 198 #endif /* RE_ENABLE_I18N */
 199
 200   /* We define EPSILON_BIT as a macro so that OP_OPEN_SUBEXP is used
 201      when the debugger shows values of this enum type.  */
 202 #define EPSILON_BIT 8
 203   OP_OPEN_SUBEXP = EPSILON_BIT | 0,
 204   OP_CLOSE_SUBEXP = EPSILON_BIT | 1,
 205   OP_ALT = EPSILON_BIT | 2,
 206   OP_DUP_ASTERISK = EPSILON_BIT | 3,
 207   ANCHOR = EPSILON_BIT | 4,
 208
 209   /* Tree type, these are used only by tree. */
 210   CONCAT = 16,
 211   SUBEXP = 17,
 212
 213   /* Token type, these are used only by token.  */
 214   OP_DUP_PLUS = 18,
 215   OP_DUP_QUESTION,
 216   OP_OPEN_BRACKET,
 217   OP_CLOSE_BRACKET,
 218   OP_CHARSET_RANGE,
 219   OP_OPEN_DUP_NUM,
 220   OP_CLOSE_DUP_NUM,
 221   OP_NON_MATCH_LIST,
 222   OP_OPEN_COLL_ELEM,
 223   OP_CLOSE_COLL_ELEM,
 224   OP_OPEN_EQUIV_CLASS,
 225   OP_CLOSE_EQUIV_CLASS,
 226   OP_OPEN_CHAR_CLASS,
 227   OP_CLOSE_CHAR_CLASS,
 228   OP_WORD,
 229   OP_NOTWORD,
 230   OP_SPACE,
 231   OP_NOTSPACE,
 232   BACK_SLASH
 233
 234 } re_token_type_t;
 235
 236 #ifdef RE_ENABLE_I18N
 237 typedef struct
 238 {
 239   /* Multibyte characters.  */
 240   wchar_t *mbchars;
 241
 242   /* Collating symbols.  */
 243 # ifdef _LIBC
 244   int32_t *coll_syms;
 245 # endif
 246
 247   /* Equivalence classes. */
 248 # ifdef _LIBC
 249   int32_t *equiv_classes;
 250 # endif
 251
 252   /* Range expressions. */
 253 # ifdef _LIBC
 254   uint32_t *range_starts;
 255   uint32_t *range_ends;
 256 # else /* not _LIBC */
 257   wchar_t *range_starts;
 258   wchar_t *range_ends;
 259 # endif /* not _LIBC */
 260
 261   /* Character classes. */
 262   wctype_t *char_classes;
 263
 264   /* If this character set is the non-matching list.  */
 265   unsigned int non_match : 1;
 266
 267   /* # of multibyte characters.  */
 268   int nmbchars;
 269
 270   /* # of collating symbols.  */
 271   int ncoll_syms;
 272
 273   /* # of equivalence classes. */
 274   int nequiv_classes;
 275
 276   /* # of range expressions. */
 277   int nranges;
 278
 279   /* # of character classes. */
 280   int nchar_classes;
 281 } re_charset_t;
 282 #endif /* RE_ENABLE_I18N */
 283
 284 typedef struct
 285 {
 286   union
 287   {
 288     unsigned char c;            /* for CHARACTER */
 289     re_bitset_ptr_t sbcset;     /* for SIMPLE_BRACKET */
 290 #ifdef RE_ENABLE_I18N
 291     re_charset_t *mbcset;       /* for COMPLEX_BRACKET */
 292 #endif /* RE_ENABLE_I18N */
 293     int idx;                    /* for BACK_REF */
 294     re_context_type ctx_type;   /* for ANCHOR */
 295   } opr;
 296 #if __GNUC__ >= 2
 297   re_token_type_t type : 8;
 298 #else
 299   re_token_type_t type;
 300 #endif
 301   unsigned int constraint : 10; /* context constraint */
 302   unsigned int duplicated : 1;
 303   unsigned int opt_subexp : 1;
 304 #ifdef RE_ENABLE_I18N
 305   unsigned int accept_mb : 1;
 306   /* These 2 bits can be moved into the union if needed (e.g. if running out
 307      of bits; move opr.c to opr.c.c and move the flags to opr.c.flags).  */
 308   unsigned int mb_partial : 1;
 309 #endif
 310   unsigned int word_char : 1;
 311 } re_token_t;
 312
 313 #define IS_EPSILON_NODE(type) ((type) & EPSILON_BIT)
 314
 315 struct re_string_t
 316 {
 317   /* Indicate the raw buffer which is the original string passed as an
 318      argument of regexec(), re_search(), etc..  */
 319   const unsigned char *raw_mbs;
 320   /* Store the multibyte string.  In case of "case insensitive mode" like
 321      REG_ICASE, upper cases of the string are stored, otherwise MBS points
 322      the same address that RAW_MBS points.  */
 323   unsigned char *mbs;
 324 #ifdef RE_ENABLE_I18N
 325   /* Store the wide character string which is corresponding to MBS.  */
 326   wint_t *wcs;
 327   int *offsets;
 328   mbstate_t cur_state;
 329 #endif
 330   /* Index in RAW_MBS.  Each character mbs[i] corresponds to
 331      raw_mbs[raw_mbs_idx + i].  */
 332   int raw_mbs_idx;
 333   /* The length of the valid characters in the buffers.  */
 334   int valid_len;
 335   /* The corresponding number of bytes in raw_mbs array.  */
 336   int valid_raw_len;
 337   /* The length of the buffers MBS and WCS.  */
 338   int bufs_len;
 339   /* The index in MBS, which is updated by re_string_fetch_byte.  */
 340   int cur_idx;
 341   /* length of RAW_MBS array.  */
 342   int raw_len;
 343   /* This is RAW_LEN - RAW_MBS_IDX + VALID_LEN - VALID_RAW_LEN.  */
 344   int len;
 345   /* End of the buffer may be shorter than its length in the cases such
 346      as re_match_2, re_search_2.  Then, we use STOP for end of the buffer
 347      instead of LEN.  */
 348   int raw_stop;
 349   /* This is RAW_STOP - RAW_MBS_IDX adjusted through OFFSETS.  */
 350   int stop;
 351
 352   /* The context of mbs[0].  We store the context independently, since
 353      the context of mbs[0] may be different from raw_mbs[0], which is
 354      the beginning of the input string.  */
 355   unsigned int tip_context;
 356   /* The translation passed as a part of an argument of re_compile_pattern.  */
 357   RE_TRANSLATE_TYPE trans;
 358   /* Copy of re_dfa_t's word_char.  */
 359   re_const_bitset_ptr_t word_char;
 360   /* 1 if REG_ICASE.  */
 361   unsigned char icase;
 362   unsigned char is_utf8;
 363   unsigned char map_notascii;
 364   unsigned char mbs_allocated;
 365   unsigned char offsets_needed;
 366   unsigned char newline_anchor;
 367   unsigned char word_ops_used;
 368   int mb_cur_max;
 369 };
 370 typedef struct re_string_t re_string_t;
 371
 372
 373 struct re_dfa_t;
 374 typedef struct re_dfa_t re_dfa_t;
 375
 376 #ifndef _LIBC
 377 # ifdef __i386__
 378 #  define internal_function   __attribute__ ((regparm (3), stdcall))
 379 # else
 380 #  define internal_function
 381 # endif
 382 #endif
 383
 384 #if IS_IN (libc)
 385 static reg_errcode_t re_string_realloc_buffers (re_string_t *pstr,
 386                                                 int new_buf_len)
 387      internal_function;
 388 # ifdef RE_ENABLE_I18N
 389 static void build_wcs_buffer (re_string_t *pstr) internal_function;
 390 static reg_errcode_t build_wcs_upper_buffer (re_string_t *pstr)
 391   internal_function;
 392 # endif /* RE_ENABLE_I18N */
 393 static void build_upper_buffer (re_string_t *pstr) internal_function;
 394 static void re_string_translate_buffer (re_string_t *pstr) internal_function;
 395 static unsigned int re_string_context_at (const re_string_t *input, int idx,
 396                                           int eflags)
 397      internal_function __attribute__ ((pure));
 398 #endif
 399 #define re_string_peek_byte(pstr, offset) \
 400   ((pstr)->mbs[(pstr)->cur_idx + offset])
 401 #define re_string_fetch_byte(pstr) \
 402   ((pstr)->mbs[(pstr)->cur_idx++])
 403 #define re_string_first_byte(pstr, idx) \
 404   ((idx) == (pstr)->valid_len || (pstr)->wcs[idx] != WEOF)
 405 #define re_string_is_single_byte_char(pstr, idx) \
 406   ((pstr)->wcs[idx] != WEOF && ((pstr)->valid_len == (idx) + 1 \
 407                                 || (pstr)->wcs[(idx) + 1] != WEOF))
 408 #define re_string_eoi(pstr) ((pstr)->stop <= (pstr)->cur_idx)
 409 #define re_string_cur_idx(pstr) ((pstr)->cur_idx)
 410 #define re_string_get_buffer(pstr) ((pstr)->mbs)
 411 #define re_string_length(pstr) ((pstr)->len)
 412 #define re_string_byte_at(pstr,idx) ((pstr)->mbs[idx])
 413 #define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx))
 414 #define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx))
 415
 416 #include <alloca.h>
 417
 418 #ifndef _LIBC
 419 # if HAVE_ALLOCA
 420 /* The OS usually guarantees only one guard page at the bottom of the stack,
 421    and a page size can be as small as 4096 bytes.  So we cannot safely
 422    allocate anything larger than 4096 bytes.  Also care for the possibility
 423    of a few compiler-allocated temporary stack slots.  */
 424 #  define __libc_use_alloca(n) ((n) < 4032)
 425 # else
 426 /* alloca is implemented with malloc, so just use malloc.  */
 427 #  define __libc_use_alloca(n) 0
 428 # endif
 429 #endif
 430
 431 #define re_malloc(t,n) ((t *) malloc ((n) * sizeof (t)))
 432 #define re_realloc(p,t,n) ((t *) realloc (p, (n) * sizeof (t)))
 433 #define re_free(p) free (p)
 434
 435 struct bin_tree_t
 436 {
 437   struct bin_tree_t *parent;
 438   struct bin_tree_t *left;
 439   struct bin_tree_t *right;
 440   struct bin_tree_t *first;
 441   struct bin_tree_t *next;
 442
 443   re_token_t token;
 444
 445   /* `node_idx' is the index in dfa->nodes, if `type' == 0.
 446      Otherwise `type' indicate the type of this node.  */
 447   int node_idx;
 448 };
 449 typedef struct bin_tree_t bin_tree_t;
 450
 451 #define BIN_TREE_STORAGE_SIZE \
 452   ((1024 - sizeof (void *)) / sizeof (bin_tree_t))
 453
 454 struct bin_tree_storage_t
 455 {
 456   struct bin_tree_storage_t *next;
 457   bin_tree_t data[BIN_TREE_STORAGE_SIZE];
 458 };
 459 typedef struct bin_tree_storage_t bin_tree_storage_t;
 460
 461 #define CONTEXT_WORD 1
 462 #define CONTEXT_NEWLINE (CONTEXT_WORD << 1)
 463 #define CONTEXT_BEGBUF (CONTEXT_NEWLINE << 1)
 464 #define CONTEXT_ENDBUF (CONTEXT_BEGBUF << 1)
 465
 466 #define IS_WORD_CONTEXT(c) ((c) & CONTEXT_WORD)
 467 #define IS_NEWLINE_CONTEXT(c) ((c) & CONTEXT_NEWLINE)
 468 #define IS_BEGBUF_CONTEXT(c) ((c) & CONTEXT_BEGBUF)
 469 #define IS_ENDBUF_CONTEXT(c) ((c) & CONTEXT_ENDBUF)
 470 #define IS_ORDINARY_CONTEXT(c) ((c) == 0)
 471
 472 #define IS_WORD_CHAR(ch) (isalnum (ch) || (ch) == '_')
 473 #define IS_NEWLINE(ch) ((ch) == NEWLINE_CHAR)
 474 #define IS_WIDE_WORD_CHAR(ch) (__iswalnum (ch) || (ch) == L'_')
 475 #define IS_WIDE_NEWLINE(ch) ((ch) == WIDE_NEWLINE_CHAR)
 476
 477 #define NOT_SATISFY_PREV_CONSTRAINT(constraint,context) \
 478  ((((constraint) & PREV_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
 479   || ((constraint & PREV_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
 480   || ((constraint & PREV_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context))\
 481   || ((constraint & PREV_BEGBUF_CONSTRAINT) && !IS_BEGBUF_CONTEXT (context)))
 482
 483 #define NOT_SATISFY_NEXT_CONSTRAINT(constraint,context) \
 484  ((((constraint) & NEXT_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
 485   || (((constraint) & NEXT_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
 486   || (((constraint) & NEXT_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context)) \
 487   || (((constraint) & NEXT_ENDBUF_CONSTRAINT) && !IS_ENDBUF_CONTEXT (context)))
 488
 489 struct re_dfastate_t
 490 {
 491   unsigned int hash;
 492   re_node_set nodes;
 493   re_node_set non_eps_nodes;
 494   re_node_set inveclosure;
 495   re_node_set *entrance_nodes;
 496   struct re_dfastate_t **trtable, **word_trtable;
 497   unsigned int context : 4;
 498   unsigned int halt : 1;
 499   /* If this state can accept `multi byte'.
 500      Note that we refer to multibyte characters, and multi character
 501      collating elements as `multi byte'.  */
 502   unsigned int accept_mb : 1;
 503   /* If this state has backreference node(s).  */
 504   unsigned int has_backref : 1;
 505   unsigned int has_constraint : 1;
 506 };
 507 typedef struct re_dfastate_t re_dfastate_t;
 508
 509 struct re_state_table_entry
 510 {
 511   int num;
 512   int alloc;
 513   re_dfastate_t **array;
 514 };
 515
 516 /* Array type used in re_sub_match_last_t and re_sub_match_top_t.  */
 517
 518 typedef struct
 519 {
 520   int next_idx;
 521   int alloc;
 522   re_dfastate_t **array;
 523 } state_array_t;
 524
 525 /* Store information about the node NODE whose type is OP_CLOSE_SUBEXP.  */
 526
 527 typedef struct
 528 {
 529   int node;
 530   int str_idx; /* The position NODE match at.  */
 531   state_array_t path;
 532 } re_sub_match_last_t;
 533
 534 /* Store information about the node NODE whose type is OP_OPEN_SUBEXP.
 535    And information about the node, whose type is OP_CLOSE_SUBEXP,
 536    corresponding to NODE is stored in LASTS.  */
 537
 538 typedef struct
 539 {
 540   int str_idx;
 541   int node;
 542   state_array_t *path;
 543   int alasts; /* Allocation size of LASTS.  */
 544   int nlasts; /* The number of LASTS.  */
 545   re_sub_match_last_t **lasts;
 546 } re_sub_match_top_t;
 547
 548 struct re_backref_cache_entry
 549 {
 550   int node;
 551   int str_idx;
 552   int subexp_from;
 553   int subexp_to;
 554   char more;
 555   char unused;
 556   unsigned short int eps_reachable_subexps_map;
 557 };
 558
 559 typedef struct
 560 {
 561   /* The string object corresponding to the input string.  */
 562   re_string_t input;
 563 #if defined _LIBC || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
 564   const re_dfa_t *const dfa;
 565 #else
 566   const re_dfa_t *dfa;
 567 #endif
 568   /* EFLAGS of the argument of regexec.  */
 569   int eflags;
 570   /* Where the matching ends.  */
 571   int match_last;
 572   int last_node;
 573   /* The state log used by the matcher.  */
 574   re_dfastate_t **state_log;
 575   int state_log_top;
 576   /* Back reference cache.  */
 577   int nbkref_ents;
 578   int abkref_ents;
 579   struct re_backref_cache_entry *bkref_ents;
 580   int max_mb_elem_len;
 581   int nsub_tops;
 582   int asub_tops;
 583   re_sub_match_top_t **sub_tops;
 584 } re_match_context_t;
 585
 586 typedef struct
 587 {
 588   re_dfastate_t **sifted_states;
 589   re_dfastate_t **limited_states;
 590   int last_node;
 591   int last_str_idx;
 592   re_node_set limits;
 593 } re_sift_context_t;
 594
 595 struct re_fail_stack_ent_t
 596 {
 597   int idx;
 598   int node;
 599   regmatch_t *regs;
 600   re_node_set eps_via_nodes;
 601 };
 602
 603 struct re_fail_stack_t
 604 {
 605   int num;
 606   int alloc;
 607   struct re_fail_stack_ent_t *stack;
 608 };
 609
 610 struct re_dfa_t
 611 {
 612   re_token_t *nodes;
 613   size_t nodes_alloc;
 614   size_t nodes_len;
 615   int *nexts;
 616   int *org_indices;
 617   re_node_set *edests;
 618   re_node_set *eclosures;
 619   re_node_set *inveclosures;
 620   struct re_state_table_entry *state_table;
 621   re_dfastate_t *init_state;
 622   re_dfastate_t *init_state_word;
 623   re_dfastate_t *init_state_nl;
 624   re_dfastate_t *init_state_begbuf;
 625   bin_tree_t *str_tree;
 626   bin_tree_storage_t *str_tree_storage;
 627   re_bitset_ptr_t sb_char;
 628   int str_tree_storage_idx;
 629
 630   /* number of subexpressions `re_nsub' is in regex_t.  */
 631   unsigned int state_hash_mask;
 632   int init_node;
 633   int nbackref; /* The number of backreference in this dfa.  */
 634
 635   /* Bitmap expressing which backreference is used.  */
 636   bitset_word_t used_bkref_map;
 637   bitset_word_t completed_bkref_map;
 638
 639   unsigned int has_plural_match : 1;
 640   /* If this dfa has "multibyte node", which is a backreference or
 641      a node which can accept multibyte character or multi character
 642      collating element.  */
 643   unsigned int has_mb_node : 1;
 644   unsigned int is_utf8 : 1;
 645   unsigned int map_notascii : 1;
 646   unsigned int word_ops_used : 1;
 647   int mb_cur_max;
 648   bitset_t word_char;
 649   reg_syntax_t syntax;
 650   int *subexp_map;
 651 #ifdef DEBUG
 652   char* re_str;
 653 #endif
 654   __libc_lock_define (, lock)
 655 };
 656
 657 #define re_node_set_init_empty(set) memset (set, '\0', sizeof (re_node_set))
 658 #define re_node_set_remove(set,id) \
 659   (re_node_set_remove_at (set, re_node_set_contains (set, id) - 1))
 660 #define re_node_set_empty(p) ((p)->nelem = 0)
 661 #define re_node_set_free(set) re_free ((set)->elems)
 662 \f
 663
 664 typedef enum
 665 {
 666   SB_CHAR,
 667   MB_CHAR,
 668   EQUIV_CLASS,
 669   COLL_SYM,
 670   CHAR_CLASS
 671 } bracket_elem_type;
 672
 673 typedef struct
 674 {
 675   bracket_elem_type type;
 676   union
 677   {
 678     unsigned char ch;
 679     unsigned char *name;
 680     wchar_t wch;
 681   } opr;
 682 } bracket_elem_t;
 683
 684
 685 /* Inline functions for bitset operation.  */
 686 static void __attribute__ ((unused))
 687 bitset_not (bitset_t set)
 688 {
 689   int bitset_i;
 690   for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i)
 691     set[bitset_i] = ~set[bitset_i];
 692 }
 693
 694 static void __attribute__ ((unused))
 695 bitset_merge (bitset_t dest, const bitset_t src)
 696 {
 697   int bitset_i;
 698   for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i)
 699     dest[bitset_i] |= src[bitset_i];
 700 }
 701
 702 static void __attribute__ ((unused))
 703 bitset_mask (bitset_t dest, const bitset_t src)
 704 {
 705   int bitset_i;
 706   for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i)
 707     dest[bitset_i] &= src[bitset_i];
 708 }
 709
 710 #ifdef RE_ENABLE_I18N
 711 /* Inline functions for re_string.  */
 712 static int
 713 internal_function __attribute__ ((pure, unused))
 714 re_string_char_size_at (const re_string_t *pstr, int idx)
 715 {
 716   int byte_idx;
 717   if (pstr->mb_cur_max == 1)
 718     return 1;
 719   for (byte_idx = 1; idx + byte_idx < pstr->valid_len; ++byte_idx)
 720     if (pstr->wcs[idx + byte_idx] != WEOF)
 721       break;
 722   return byte_idx;
 723 }
 724
 725 static wint_t
 726 internal_function __attribute__ ((pure, unused))
 727 re_string_wchar_at (const re_string_t *pstr, int idx)
 728 {
 729   if (pstr->mb_cur_max == 1)
 730     return (wint_t) pstr->mbs[idx];
 731   return (wint_t) pstr->wcs[idx];
 732 }
 733
 734 # if IS_IN (libc)
 735 #  ifdef _LIBC
 736 #   include <locale/weight.h>
 737 #  endif
 738
 739 static int
 740 internal_function __attribute__ ((pure, unused))
 741 re_string_elem_size_at (const re_string_t *pstr, int idx)
 742 {
 743 #  ifdef _LIBC
 744   const unsigned char *p, *extra;
 745   const int32_t *table, *indirect;
 746   uint_fast32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
 747
 748   if (nrules != 0)
 749     {
 750       table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
 751       extra = (const unsigned char *)
 752         _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB);
 753       indirect = (const int32_t *) _NL_CURRENT (LC_COLLATE,
 754                                                 _NL_COLLATE_INDIRECTMB);
 755       p = pstr->mbs + idx;
 756       findidx (table, indirect, extra, &p, pstr->len - idx);
 757       return p - pstr->mbs - idx;
 758     }
 759   else
 760 #  endif /* _LIBC */
 761     return 1;
 762 }
 763 # endif
 764 #endif /* RE_ENABLE_I18N */
 765
 766 #endif /*  _REGEX_INTERNAL_H */