contrib/cvs-1.12/lib/regex.h

   1 /* Definitions for data structures and routines for the regular
   2    expression library.
   3    Copyright (C) 1985,1989-93,1995-98,2000,2001,2002,2003,2005
   4    Free Software Foundation, Inc.
   5    This file is part of the GNU C Library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License along
  18    with this program; if not, write to the Free Software Foundation,
  19    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
  20
  21 #ifndef _REGEX_H
  22 #define _REGEX_H 1
  23
  24 #include <sys/types.h>
  25
  26 /* Allow the use in C++ code.  */
  27 #ifdef __cplusplus
  28 extern "C" {
  29 #endif
  30
  31 /* Define _REGEX_SOURCE to get definitions that are incompatible with
  32    POSIX.  */
  33 #if (!defined _REGEX_SOURCE                                     \
  34      && (defined _GNU_SOURCE                                    \
  35          || (!defined _POSIX_C_SOURCE && !defined _POSIX_SOURCE \
  36              && !defined _XOPEN_SOURCE)))
  37 # define _REGEX_SOURCE 1
  38 #endif
  39
  40 #if defined _REGEX_SOURCE && defined VMS
  41 /* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it
  42    should be there.  */
  43 # include <stddef.h>
  44 #endif
  45
  46 #ifdef _REGEX_LARGE_OFFSETS
  47
  48 /* Use types and values that are wide enough to represent signed and
  49    unsigned byte offsets in memory.  This currently works only when
  50    the regex code is used outside of the GNU C library; it is not yet
  51    supported within glibc itself, and glibc users should not define
  52    _REGEX_LARGE_OFFSETS.  */
  53
  54 /* The type of the offset of a byte within a string.
  55    For historical reasons POSIX 1003.1-2004 requires that regoff_t be
  56    at least as wide as off_t.  This is a bit odd (and many common
  57    POSIX platforms set it to the more-sensible ssize_t) but we might
  58    as well conform.  We don't know of any hosts where ssize_t is wider
  59    than off_t, so off_t is safe.  */
  60 typedef off_t regoff_t;
  61
  62 /* The type of nonnegative object indexes.  Traditionally, GNU regex
  63    uses 'int' for these.  Code that uses __re_idx_t should work
  64    regardless of whether the type is signed.  */
  65 typedef size_t __re_idx_t;
  66
  67 /* The type of object sizes.  */
  68 typedef size_t __re_size_t;
  69
  70 /* The type of object sizes, in places where the traditional code
  71    uses unsigned long int.  */
  72 typedef size_t __re_long_size_t;
  73
  74 #else
  75
  76 /* Use types that are binary-compatible with the traditional GNU regex
  77    implementation, which mishandles strings longer than INT_MAX.  */
  78
  79 typedef int regoff_t;
  80 typedef int __re_idx_t;
  81 typedef unsigned int __re_size_t;
  82 typedef unsigned long int __re_long_size_t;
  83
  84 #endif
  85
  86 /* The following two types have to be signed and unsigned integer type
  87    wide enough to hold a value of a pointer.  For most ANSI compilers
  88    ptrdiff_t and size_t should be likely OK.  Still size of these two
  89    types is 2 for Microsoft C.  Ugh... */
  90 typedef long int s_reg_t;
  91 typedef unsigned long int active_reg_t;
  92
  93 /* The following bits are used to determine the regexp syntax we
  94    recognize.  The set/not-set meanings are chosen so that Emacs syntax
  95    remains the value 0.  The bits are given in alphabetical order, and
  96    the definitions shifted by one from the previous bit; thus, when we
  97    add or remove a bit, only one other definition need change.  */
  98 typedef unsigned long int reg_syntax_t;
  99
 100 /* If this bit is not set, then \ inside a bracket expression is literal.
 101    If set, then such a \ quotes the following character.  */
 102 #define REG_BACKSLASH_ESCAPE_IN_LISTS 1ul
 103
 104 /* If this bit is not set, then + and ? are operators, and \+ and \? are
 105      literals.
 106    If set, then \+ and \? are operators and + and ? are literals.  */
 107 #define REG_BK_PLUS_QM (1ul << 1)
 108
 109 /* If this bit is set, then character classes are supported.  They are:
 110      [:alpha:], [:upper:], [:lower:],  [:digit:], [:alnum:], [:xdigit:],
 111      [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:].
 112    If not set, then character classes are not supported.  */
 113 #define REG_CHAR_CLASSES (1ul << 2)
 114
 115 /* If this bit is set, then ^ and $ are always anchors (outside bracket
 116      expressions, of course).
 117    If this bit is not set, then it depends:
 118         ^  is an anchor if it is at the beginning of a regular
 119            expression or after an open-group or an alternation operator;
 120         $  is an anchor if it is at the end of a regular expression, or
 121            before a close-group or an alternation operator.
 122
 123    This bit could be (re)combined with REG_CONTEXT_INDEP_OPS, because
 124    POSIX draft 11.2 says that * etc. in leading positions is undefined.
 125    We already implemented a previous draft which made those constructs
 126    invalid, though, so we haven't changed the code back.  */
 127 #define REG_CONTEXT_INDEP_ANCHORS (1ul << 3)
 128
 129 /* If this bit is set, then special characters are always special
 130      regardless of where they are in the pattern.
 131    If this bit is not set, then special characters are special only in
 132      some contexts; otherwise they are ordinary.  Specifically,
 133      * + ? and intervals are only special when not after the beginning,
 134      open-group, or alternation operator.  */
 135 #define REG_CONTEXT_INDEP_OPS (1ul << 4)
 136
 137 /* If this bit is set, then *, +, ?, and { cannot be first in an re or
 138      immediately after an alternation or begin-group operator.  */
 139 #define REG_CONTEXT_INVALID_OPS (1ul << 5)
 140
 141 /* If this bit is set, then . matches newline.
 142    If not set, then it doesn't.  */
 143 #define REG_DOT_NEWLINE (1ul << 6)
 144
 145 /* If this bit is set, then . doesn't match NUL.
 146    If not set, then it does.  */
 147 #define REG_DOT_NOT_NULL (1ul << 7)
 148
 149 /* If this bit is set, nonmatching lists [^...] do not match newline.
 150    If not set, they do.  */
 151 #define REG_HAT_LISTS_NOT_NEWLINE (1ul << 8)
 152
 153 /* If this bit is set, either \{...\} or {...} defines an
 154      interval, depending on REG_NO_BK_BRACES.
 155    If not set, \{, \}, {, and } are literals.  */
 156 #define REG_INTERVALS (1ul << 9)
 157
 158 /* If this bit is set, +, ? and | aren't recognized as operators.
 159    If not set, they are.  */
 160 #define REG_LIMITED_OPS (1ul << 10)
 161
 162 /* If this bit is set, newline is an alternation operator.
 163    If not set, newline is literal.  */
 164 #define REG_NEWLINE_ALT (1ul << 11)
 165
 166 /* If this bit is set, then `{...}' defines an interval, and \{ and \}
 167      are literals.
 168   If not set, then `\{...\}' defines an interval.  */
 169 #define REG_NO_BK_BRACES (1ul << 12)
 170
 171 /* If this bit is set, (...) defines a group, and \( and \) are literals.
 172    If not set, \(...\) defines a group, and ( and ) are literals.  */
 173 #define REG_NO_BK_PARENS (1ul << 13)
 174
 175 /* If this bit is set, then \<digit> matches <digit>.
 176    If not set, then \<digit> is a back-reference.  */
 177 #define REG_NO_BK_REFS (1ul << 14)
 178
 179 /* If this bit is set, then | is an alternation operator, and \| is literal.
 180    If not set, then \| is an alternation operator, and | is literal.  */
 181 #define REG_NO_BK_VBAR (1ul << 15)
 182
 183 /* If this bit is set, then an ending range point collating higher
 184      than the starting range point, as in [z-a], is invalid.
 185    If not set, the containing range is empty and does not match any string.  */
 186 #define REG_NO_EMPTY_RANGES (1ul << 16)
 187
 188 /* If this bit is set, then an unmatched ) is ordinary.
 189    If not set, then an unmatched ) is invalid.  */
 190 #define REG_UNMATCHED_RIGHT_PAREN_ORD (1ul << 17)
 191
 192 /* If this bit is set, succeed as soon as we match the whole pattern,
 193    without further backtracking.  */
 194 #define REG_NO_POSIX_BACKTRACKING (1ul << 18)
 195
 196 /* If this bit is set, do not process the GNU regex operators.
 197    If not set, then the GNU regex operators are recognized. */
 198 #define REG_NO_GNU_OPS (1ul << 19)
 199
 200 /* If this bit is set, turn on internal regex debugging.
 201    If not set, and debugging was on, turn it off.
 202    This only works if regex.c is compiled -DDEBUG.
 203    We define this bit always, so that all that's needed to turn on
 204    debugging is to recompile regex.c; the calling code can always have
 205    this bit set, and it won't affect anything in the normal case. */
 206 #define REG_DEBUG (1ul << 20)
 207
 208 /* If this bit is set, a syntactically invalid interval is treated as
 209    a string of ordinary characters.  For example, the ERE 'a{1' is
 210    treated as 'a\{1'.  */
 211 #define REG_INVALID_INTERVAL_ORD (1ul << 21)
 212
 213 /* If this bit is set, then ignore case when matching.
 214    If not set, then case is significant.  */
 215 #define REG_IGNORE_CASE (1ul << 22)
 216
 217 /* This bit is used internally like REG_CONTEXT_INDEP_ANCHORS but only
 218    for ^, because it is difficult to scan the regex backwards to find
 219    whether ^ should be special.  */
 220 #define REG_CARET_ANCHORS_HERE (1ul << 23)
 221
 222 /* If this bit is set, then \{ cannot be first in an bre or
 223    immediately after an alternation or begin-group operator.  */
 224 #define REG_CONTEXT_INVALID_DUP (1ul << 24)
 225
 226 /* If this bit is set, then no_sub will be set to 1 during
 227    re_compile_pattern.  */
 228 #define REG_NO_SUB (1ul << 25)
 229
 230 /* This global variable defines the particular regexp syntax to use (for
 231    some interfaces).  When a regexp is compiled, the syntax used is
 232    stored in the pattern buffer, so changing this does not affect
 233    already-compiled regexps.  */
 234 extern reg_syntax_t re_syntax_options;
 235 \f
 236 /* Define combinations of the above bits for the standard possibilities.
 237    (The [[[ comments delimit what gets put into the Texinfo file, so
 238    don't delete them!)  */
 239 /* [[[begin syntaxes]]] */
 240 #define REG_SYNTAX_EMACS 0
 241
 242 #define REG_SYNTAX_AWK                                                  \
 243   (REG_BACKSLASH_ESCAPE_IN_LISTS   | REG_DOT_NOT_NULL                   \
 244    | REG_NO_BK_PARENS              | REG_NO_BK_REFS                     \
 245    | REG_NO_BK_VBAR                | REG_NO_EMPTY_RANGES                \
 246    | REG_DOT_NEWLINE               | REG_CONTEXT_INDEP_ANCHORS          \
 247    | REG_UNMATCHED_RIGHT_PAREN_ORD | REG_NO_GNU_OPS)
 248
 249 #define REG_SYNTAX_GNU_AWK                                              \
 250   ((REG_SYNTAX_POSIX_EXTENDED | REG_BACKSLASH_ESCAPE_IN_LISTS           \
 251     | REG_DEBUG)                                                        \
 252    & ~(REG_DOT_NOT_NULL | REG_INTERVALS | REG_CONTEXT_INDEP_OPS         \
 253        | REG_CONTEXT_INVALID_OPS ))
 254
 255 #define REG_SYNTAX_POSIX_AWK                                            \
 256   (REG_SYNTAX_POSIX_EXTENDED | REG_BACKSLASH_ESCAPE_IN_LISTS            \
 257    | REG_INTERVALS           | REG_NO_GNU_OPS)
 258
 259 #define REG_SYNTAX_GREP                                                 \
 260   (REG_BK_PLUS_QM              | REG_CHAR_CLASSES                       \
 261    | REG_HAT_LISTS_NOT_NEWLINE | REG_INTERVALS                          \
 262    | REG_NEWLINE_ALT)
 263
 264 #define REG_SYNTAX_EGREP                                                \
 265   (REG_CHAR_CLASSES        | REG_CONTEXT_INDEP_ANCHORS                  \
 266    | REG_CONTEXT_INDEP_OPS | REG_HAT_LISTS_NOT_NEWLINE                  \
 267    | REG_NEWLINE_ALT       | REG_NO_BK_PARENS                           \
 268    | REG_NO_BK_VBAR)
 269
 270 #define REG_SYNTAX_POSIX_EGREP                                          \
 271   (REG_SYNTAX_EGREP | REG_INTERVALS | REG_NO_BK_BRACES                  \
 272    | REG_INVALID_INTERVAL_ORD)
 273
 274 /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff.  */
 275 #define REG_SYNTAX_ED REG_SYNTAX_POSIX_BASIC
 276
 277 #define REG_SYNTAX_SED REG_SYNTAX_POSIX_BASIC
 278
 279 /* Syntax bits common to both basic and extended POSIX regex syntax.  */
 280 #define _REG_SYNTAX_POSIX_COMMON                                        \
 281   (REG_CHAR_CLASSES | REG_DOT_NEWLINE    | REG_DOT_NOT_NULL             \
 282    | REG_INTERVALS  | REG_NO_EMPTY_RANGES)
 283
 284 #define REG_SYNTAX_POSIX_BASIC                                          \
 285   (_REG_SYNTAX_POSIX_COMMON | REG_BK_PLUS_QM | REG_CONTEXT_INVALID_DUP)
 286
 287 /* Differs from ..._POSIX_BASIC only in that REG_BK_PLUS_QM becomes
 288    REG_LIMITED_OPS, i.e., \? \+ \| are not recognized.  Actually, this
 289    isn't minimal, since other operators, such as \`, aren't disabled.  */
 290 #define REG_SYNTAX_POSIX_MINIMAL_BASIC                                  \
 291   (_REG_SYNTAX_POSIX_COMMON | REG_LIMITED_OPS)
 292
 293 #define REG_SYNTAX_POSIX_EXTENDED                                       \
 294   (_REG_SYNTAX_POSIX_COMMON  | REG_CONTEXT_INDEP_ANCHORS                \
 295    | REG_CONTEXT_INDEP_OPS   | REG_NO_BK_BRACES                         \
 296    | REG_NO_BK_PARENS        | REG_NO_BK_VBAR                           \
 297    | REG_CONTEXT_INVALID_OPS | REG_UNMATCHED_RIGHT_PAREN_ORD)
 298
 299 /* Differs from ..._POSIX_EXTENDED in that REG_CONTEXT_INDEP_OPS is
 300    removed and REG_NO_BK_REFS is added.  */
 301 #define REG_SYNTAX_POSIX_MINIMAL_EXTENDED                               \
 302   (_REG_SYNTAX_POSIX_COMMON  | REG_CONTEXT_INDEP_ANCHORS                \
 303    | REG_CONTEXT_INVALID_OPS | REG_NO_BK_BRACES                         \
 304    | REG_NO_BK_PARENS        | REG_NO_BK_REFS                           \
 305    | REG_NO_BK_VBAR          | REG_UNMATCHED_RIGHT_PAREN_ORD)
 306 /* [[[end syntaxes]]] */
 307 \f
 308 /* Maximum number of duplicates an interval can allow.  This is
 309    distinct from RE_DUP_MAX, to conform to POSIX name space rules and
 310    to avoid collisions with <limits.h>.  */
 311 #define REG_DUP_MAX 32767
 312
 313
 314 /* POSIX `cflags' bits (i.e., information for `regcomp').  */
 315
 316 /* If this bit is set, then use extended regular expression syntax.
 317    If not set, then use basic regular expression syntax.  */
 318 #define REG_EXTENDED 1
 319
 320 /* If this bit is set, then ignore case when matching.
 321    If not set, then case is significant.  */
 322 #define REG_ICASE (1 << 1)
 323
 324 /* If this bit is set, then anchors do not match at newline
 325      characters in the string.
 326    If not set, then anchors do match at newlines.  */
 327 #define REG_NEWLINE (1 << 2)
 328
 329 /* If this bit is set, then report only success or fail in regexec.
 330    If not set, then returns differ between not matching and errors.  */
 331 #define REG_NOSUB (1 << 3)
 332
 333
 334 /* POSIX `eflags' bits (i.e., information for regexec).  */
 335
 336 /* If this bit is set, then the beginning-of-line operator doesn't match
 337      the beginning of the string (presumably because it's not the
 338      beginning of a line).
 339    If not set, then the beginning-of-line operator does match the
 340      beginning of the string.  */
 341 #define REG_NOTBOL 1
 342
 343 /* Like REG_NOTBOL, except for the end-of-line.  */
 344 #define REG_NOTEOL (1 << 1)
 345
 346 /* Use PMATCH[0] to delimit the start and end of the search in the
 347    buffer.  */
 348 #define REG_STARTEND (1 << 2)
 349
 350
 351 /* If any error codes are removed, changed, or added, update the
 352    `__re_error_msgid' table in regcomp.c.  */
 353
 354 typedef enum
 355 {
 356   _REG_ENOSYS = -1,     /* This will never happen for this implementation.  */
 357 #define REG_ENOSYS      _REG_ENOSYS
 358
 359   _REG_NOERROR,         /* Success.  */
 360 #define REG_NOERROR     _REG_NOERROR
 361
 362   _REG_NOMATCH,         /* Didn't find a match (for regexec).  */
 363 #define REG_NOMATCH     _REG_NOMATCH
 364
 365   /* POSIX regcomp return error codes.  (In the order listed in the
 366      standard.)  */
 367
 368   _REG_BADPAT,          /* Invalid pattern.  */
 369 #define REG_BADPAT      _REG_BADPAT
 370
 371   _REG_ECOLLATE,        /* Inalid collating element.  */
 372 #define REG_ECOLLATE    _REG_ECOLLATE
 373
 374   _REG_ECTYPE,          /* Invalid character class name.  */
 375 #define REG_ECTYPE      _REG_ECTYPE
 376
 377   _REG_EESCAPE,         /* Trailing backslash.  */
 378 #define REG_EESCAPE     _REG_EESCAPE
 379
 380   _REG_ESUBREG,         /* Invalid back reference.  */
 381 #define REG_ESUBREG     _REG_ESUBREG
 382
 383   _REG_EBRACK,          /* Unmatched left bracket.  */
 384 #define REG_EBRACK      _REG_EBRACK
 385
 386   _REG_EPAREN,          /* Parenthesis imbalance.  */
 387 #define REG_EPAREN      _REG_EPAREN
 388
 389   _REG_EBRACE,          /* Unmatched \{.  */
 390 #define REG_EBRACE      _REG_EBRACE
 391
 392   _REG_BADBR,           /* Invalid contents of \{\}.  */
 393 #define REG_BADBR       _REG_BADBR
 394
 395   _REG_ERANGE,          /* Invalid range end.  */
 396 #define REG_ERANGE      _REG_ERANGE
 397
 398   _REG_ESPACE,          /* Ran out of memory.  */
 399 #define REG_ESPACE      _REG_ESPACE
 400
 401   _REG_BADRPT,          /* No preceding re for repetition op.  */
 402 #define REG_BADRPT      _REG_BADRPT
 403
 404   /* Error codes we've added.  */
 405
 406   _REG_EEND,            /* Premature end.  */
 407 #define REG_EEND        _REG_EEND
 408
 409   _REG_ESIZE,           /* Compiled pattern bigger than 2^16 bytes.  */
 410 #define REG_ESIZE       _REG_ESIZE
 411
 412   _REG_ERPAREN          /* Unmatched ) or \); not returned from regcomp.  */
 413 #define REG_ERPAREN     _REG_ERPAREN
 414
 415 } reg_errcode_t;
 416 \f
 417 /* In the traditional GNU implementation, regex.h defined member names
 418    like `buffer' that POSIX does not allow.  These members now have
 419    names with leading `re_' (e.g., `re_buffer').  Support the old
 420    names only if _REGEX_SOURCE is defined.  New programs should use
 421    the new names.  */
 422 #ifdef _REGEX_SOURCE
 423 # define _REG_RE_NAME(id) id
 424 # define _REG_RM_NAME(id) id
 425 #else
 426 # define _REG_RE_NAME(id) re_##id
 427 # define _REG_RM_NAME(id) rm_##id
 428 #endif
 429
 430 /* The user can specify the type of the re_translate member by
 431    defining the macro REG_TRANSLATE_TYPE.  In the traditional GNU
 432    implementation, this macro was named RE_TRANSLATE_TYPE, but POSIX
 433    does not allow this.  Support the old name only if _REGEX_SOURCE
 434    and if the new name is not defined. New programs should use the new
 435    name.  */
 436 #ifndef REG_TRANSLATE_TYPE
 437 # if defined _REGEX_SOURCE && defined RE_TRANSLATE_TYPE
 438 #  define REG_TRANSLATE_TYPE RE_TRANSLATE_TYPE
 439 # else
 440 #  define REG_TRANSLATE_TYPE char *
 441 # endif
 442 #endif
 443
 444 /* This data structure represents a compiled pattern.  Before calling
 445    the pattern compiler), the fields `re_buffer', `re_allocated', `re_fastmap',
 446    `re_translate', and `re_no_sub' can be set.  After the pattern has been
 447    compiled, the `re_nsub' field is available.  All other fields are
 448    private to the regex routines.  */
 449
 450 struct re_pattern_buffer
 451 {
 452 /* [[[begin pattern_buffer]]] */
 453         /* Space that holds the compiled pattern.  It is declared as
 454           `unsigned char *' because its elements are
 455            sometimes used as array indexes.  */
 456   unsigned char *_REG_RE_NAME (buffer);
 457
 458         /* Number of bytes to which `re_buffer' points.  */
 459   __re_long_size_t _REG_RE_NAME (allocated);
 460
 461         /* Number of bytes actually used in `re_buffer'.  */
 462   __re_long_size_t _REG_RE_NAME (used);
 463
 464         /* Syntax setting with which the pattern was compiled.  */
 465   reg_syntax_t _REG_RE_NAME (syntax);
 466
 467         /* Pointer to a fastmap, if any, otherwise zero.  re_search uses
 468            the fastmap, if there is one, to skip over impossible
 469            starting points for matches.  */
 470   char *_REG_RE_NAME (fastmap);
 471
 472         /* Either a translate table to apply to all characters before
 473            comparing them, or zero for no translation.  The translation
 474            is applied to a pattern when it is compiled and to a string
 475            when it is matched.  */
 476   REG_TRANSLATE_TYPE _REG_RE_NAME (translate);
 477
 478         /* Number of subexpressions found by the compiler.  */
 479   size_t re_nsub;
 480
 481         /* Zero if this pattern cannot match the empty string, one else.
 482            Well, in truth it's used only in `re_search_2', to see
 483            whether or not we should use the fastmap, so we don't set
 484            this absolutely perfectly; see `re_compile_fastmap' (the
 485            `duplicate' case).  */
 486   unsigned int _REG_RE_NAME (can_be_null) : 1;
 487
 488         /* If REG_UNALLOCATED, allocate space in the `regs' structure
 489              for `max (REG_NREGS, re_nsub + 1)' groups.
 490            If REG_REALLOCATE, reallocate space if necessary.
 491            If REG_FIXED, use what's there.  */
 492 #define REG_UNALLOCATED 0
 493 #define REG_REALLOCATE 1
 494 #define REG_FIXED 2
 495   unsigned int _REG_RE_NAME (regs_allocated) : 2;
 496
 497         /* Set to zero when `regex_compile' compiles a pattern; set to one
 498            by `re_compile_fastmap' if it updates the fastmap.  */
 499   unsigned int _REG_RE_NAME (fastmap_accurate) : 1;
 500
 501         /* If set, `re_match_2' does not return information about
 502            subexpressions.  */
 503   unsigned int _REG_RE_NAME (no_sub) : 1;
 504
 505         /* If set, a beginning-of-line anchor doesn't match at the
 506            beginning of the string.  */
 507   unsigned int _REG_RE_NAME (not_bol) : 1;
 508
 509         /* Similarly for an end-of-line anchor.  */
 510   unsigned int _REG_RE_NAME (not_eol) : 1;
 511
 512         /* If true, an anchor at a newline matches.  */
 513   unsigned int _REG_RE_NAME (newline_anchor) : 1;
 514
 515 /* [[[end pattern_buffer]]] */
 516 };
 517
 518 typedef struct re_pattern_buffer regex_t;
 519 \f
 520 /* This is the structure we store register match data in.  See
 521    regex.texinfo for a full description of what registers match.  */
 522 struct re_registers
 523 {
 524   __re_size_t _REG_RM_NAME (num_regs);
 525   regoff_t *_REG_RM_NAME (start);
 526   regoff_t *_REG_RM_NAME (end);
 527 };
 528
 529
 530 /* If `regs_allocated' is REG_UNALLOCATED in the pattern buffer,
 531    `re_match_2' returns information about at least this many registers
 532    the first time a `regs' structure is passed.  */
 533 #ifndef REG_NREGS
 534 # define REG_NREGS 30
 535 #endif
 536
 537
 538 /* POSIX specification for registers.  Aside from the different names than
 539    `re_registers', POSIX uses an array of structures, instead of a
 540    structure of arrays.  */
 541 typedef struct
 542 {
 543   regoff_t rm_so;  /* Byte offset from string's start to substring's start.  */
 544   regoff_t rm_eo;  /* Byte offset from string's start to substring's end.  */
 545 } regmatch_t;
 546 \f
 547 /* Declarations for routines.  */
 548
 549 /* Sets the current default syntax to SYNTAX, and return the old syntax.
 550    You can also simply assign to the `re_syntax_options' variable.  */
 551 extern reg_syntax_t re_set_syntax (reg_syntax_t __syntax);
 552
 553 /* Compile the regular expression PATTERN, with length LENGTH
 554    and syntax given by the global `re_syntax_options', into the buffer
 555    BUFFER.  Return NULL if successful, and an error string if not.  */
 556 extern const char *re_compile_pattern (const char *__pattern, size_t __length,
 557                                        struct re_pattern_buffer *__buffer);
 558
 559
 560 /* Compile a fastmap for the compiled pattern in BUFFER; used to
 561    accelerate searches.  Return 0 if successful and -2 if was an
 562    internal error.  */
 563 extern int re_compile_fastmap (struct re_pattern_buffer *__buffer);
 564
 565
 566 /* Search in the string STRING (with length LENGTH) for the pattern
 567    compiled into BUFFER.  Start searching at position START, for RANGE
 568    characters.  Return the starting position of the match, -1 for no
 569    match, or -2 for an internal error.  Also return register
 570    information in REGS (if REGS and BUFFER->re_no_sub are nonzero).  */
 571 extern regoff_t re_search (struct re_pattern_buffer *__buffer,
 572                            const char *__string, __re_idx_t __length,
 573                            __re_idx_t __start, regoff_t __range,
 574                            struct re_registers *__regs);
 575
 576
 577 /* Like `re_search', but search in the concatenation of STRING1 and
 578    STRING2.  Also, stop searching at index START + STOP.  */
 579 extern regoff_t re_search_2 (struct re_pattern_buffer *__buffer,
 580                              const char *__string1, __re_idx_t __length1,
 581                              const char *__string2, __re_idx_t __length2,
 582                              __re_idx_t __start, regoff_t __range,
 583                              struct re_registers *__regs,
 584                              __re_idx_t __stop);
 585
 586
 587 /* Like `re_search', but return how many characters in STRING the regexp
 588    in BUFFER matched, starting at position START.  */
 589 extern regoff_t re_match (struct re_pattern_buffer *__buffer,
 590                           const char *__string, __re_idx_t __length,
 591                           __re_idx_t __start, struct re_registers *__regs);
 592
 593
 594 /* Relates to `re_match' as `re_search_2' relates to `re_search'.  */
 595 extern regoff_t re_match_2 (struct re_pattern_buffer *__buffer,
 596                             const char *__string1, __re_idx_t __length1,
 597                             const char *__string2, __re_idx_t __length2,
 598                             __re_idx_t __start, struct re_registers *__regs,
 599                             __re_idx_t __stop);
 600
 601
 602 /* Set REGS to hold NUM_REGS registers, storing them in STARTS and
 603    ENDS.  Subsequent matches using BUFFER and REGS will use this memory
 604    for recording register information.  STARTS and ENDS must be
 605    allocated with malloc, and must each be at least `NUM_REGS * sizeof
 606    (regoff_t)' bytes long.
 607
 608    If NUM_REGS == 0, then subsequent matches should allocate their own
 609    register data.
 610
 611    Unless this function is called, the first search or match using
 612    PATTERN_BUFFER will allocate its own register data, without
 613    freeing the old data.  */
 614 extern void re_set_registers (struct re_pattern_buffer *__buffer,
 615                               struct re_registers *__regs,
 616                               __re_size_t __num_regs,
 617                               regoff_t *__starts, regoff_t *__ends);
 618
 619 #if defined _REGEX_RE_COMP || defined _LIBC
 620 # ifndef _CRAY
 621 /* 4.2 bsd compatibility.  */
 622 extern char *re_comp (const char *);
 623 extern int re_exec (const char *);
 624 # endif
 625 #endif
 626
 627 /* GCC 2.95 and later have "__restrict"; C99 compilers have
 628    "restrict", and "configure" may have defined "restrict".  */
 629 #ifndef __restrict
 630 # if ! (2 < __GNUC__ || (2 == __GNUC__ && 95 <= __GNUC_MINOR__))
 631 #  if defined restrict || 199901L <= __STDC_VERSION__
 632 #   define __restrict restrict
 633 #  else
 634 #   define __restrict
 635 #  endif
 636 # endif
 637 #endif
 638 /* gcc 3.1 and up support the [restrict] syntax, but g++ doesn't.  */
 639 #ifndef __restrict_arr
 640 # if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)) && !defined __cplusplus
 641 #  define __restrict_arr __restrict
 642 # else
 643 #  define __restrict_arr
 644 # endif
 645 #endif
 646
 647 /* POSIX compatibility.  */
 648 extern int regcomp (regex_t *__restrict __preg,
 649                     const char *__restrict __pattern,
 650                     int __cflags);
 651
 652 extern int regexec (const regex_t *__restrict __preg,
 653                     const char *__restrict __string, size_t __nmatch,
 654                     regmatch_t __pmatch[__restrict_arr],
 655                     int __eflags);
 656
 657 extern size_t regerror (int __errcode, const regex_t *__restrict __preg,
 658                         char *__restrict __errbuf, size_t __errbuf_size);
 659
 660 extern void regfree (regex_t *__preg);
 661
 662
 663 #ifdef _REGEX_SOURCE
 664
 665 /* Define the POSIX-compatible member names in terms of the
 666    incompatible (and deprecated) names established by _REG_RE_NAME.
 667    New programs should use the re_* names.  */
 668
 669 # define re_allocated allocated
 670 # define re_buffer buffer
 671 # define re_can_be_null can_be_null
 672 # define re_fastmap fastmap
 673 # define re_fastmap_accurate fastmap_accurate
 674 # define re_newline_anchor newline_anchor
 675 # define re_no_sub no_sub
 676 # define re_not_bol not_bol
 677 # define re_not_eol not_eol
 678 # define re_regs_allocated regs_allocated
 679 # define re_syntax syntax
 680 # define re_translate translate
 681 # define re_used used
 682
 683 /* Similarly for _REG_RM_NAME.  */
 684
 685 # define rm_end end
 686 # define rm_num_regs num_regs
 687 # define rm_start start
 688
 689 /* Undef RE_DUP_MAX first, in case the user has already included a
 690    <limits.h> with an incompatible definition.
 691
 692    On GNU systems, the most common spelling for RE_DUP_MAX's value in
 693    <limits.h> is (0x7ffff), so define RE_DUP_MAX to that, not to
 694    REG_DUP_MAX.  This avoid some duplicate-macro-definition warnings
 695    with programs that include <limits.h> after this file.
 696
 697    New programs should not assume that regex.h defines RE_DUP_MAX; to
 698    get the value of RE_DUP_MAX, they should instead include <limits.h>
 699    and possibly invoke the sysconf function.  */
 700
 701 # undef RE_DUP_MAX
 702 # define RE_DUP_MAX (0x7fff)
 703
 704 /* Define the following symbols for backward source compatibility.
 705    These symbols violate the POSIX name space rules, and new programs
 706    should avoid them.  */
 707
 708 # define REGS_FIXED REG_FIXED
 709 # define REGS_REALLOCATE REG_REALLOCATE
 710 # define REGS_UNALLOCATED REG_UNALLOCATED
 711 # define RE_BACKSLASH_ESCAPE_IN_LISTS REG_BACKSLASH_ESCAPE_IN_LISTS
 712 # define RE_BK_PLUS_QM REG_BK_PLUS_QM
 713 # define RE_CARET_ANCHORS_HERE REG_CARET_ANCHORS_HERE
 714 # define RE_CHAR_CLASSES REG_CHAR_CLASSES
 715 # define RE_CONTEXT_INDEP_ANCHORS REG_CONTEXT_INDEP_ANCHORS
 716 # define RE_CONTEXT_INDEP_OPS REG_CONTEXT_INDEP_OPS
 717 # define RE_CONTEXT_INVALID_DUP REG_CONTEXT_INVALID_DUP
 718 # define RE_CONTEXT_INVALID_OPS REG_CONTEXT_INVALID_OPS
 719 # define RE_DEBUG REG_DEBUG
 720 # define RE_DOT_NEWLINE REG_DOT_NEWLINE
 721 # define RE_DOT_NOT_NULL REG_DOT_NOT_NULL
 722 # define RE_HAT_LISTS_NOT_NEWLINE REG_HAT_LISTS_NOT_NEWLINE
 723 # define RE_ICASE REG_IGNORE_CASE /* avoid collision with REG_ICASE */
 724 # define RE_INTERVALS REG_INTERVALS
 725 # define RE_INVALID_INTERVAL_ORD REG_INVALID_INTERVAL_ORD
 726 # define RE_LIMITED_OPS REG_LIMITED_OPS
 727 # define RE_NEWLINE_ALT REG_NEWLINE_ALT
 728 # define RE_NO_BK_BRACES REG_NO_BK_BRACES
 729 # define RE_NO_BK_PARENS REG_NO_BK_PARENS
 730 # define RE_NO_BK_REFS REG_NO_BK_REFS
 731 # define RE_NO_BK_VBAR REG_NO_BK_VBAR
 732 # define RE_NO_EMPTY_RANGES REG_NO_EMPTY_RANGES
 733 # define RE_NO_GNU_OPS REG_NO_GNU_OPS
 734 # define RE_NO_POSIX_BACKTRACKING REG_NO_POSIX_BACKTRACKING
 735 # define RE_NO_SUB REG_NO_SUB
 736 # define RE_NREGS REG_NREGS
 737 # define RE_SYNTAX_AWK REG_SYNTAX_AWK
 738 # define RE_SYNTAX_ED REG_SYNTAX_ED
 739 # define RE_SYNTAX_EGREP REG_SYNTAX_EGREP
 740 # define RE_SYNTAX_EMACS REG_SYNTAX_EMACS
 741 # define RE_SYNTAX_GNU_AWK REG_SYNTAX_GNU_AWK
 742 # define RE_SYNTAX_GREP REG_SYNTAX_GREP
 743 # define RE_SYNTAX_POSIX_AWK REG_SYNTAX_POSIX_AWK
 744 # define RE_SYNTAX_POSIX_BASIC REG_SYNTAX_POSIX_BASIC
 745 # define RE_SYNTAX_POSIX_EGREP REG_SYNTAX_POSIX_EGREP
 746 # define RE_SYNTAX_POSIX_EXTENDED REG_SYNTAX_POSIX_EXTENDED
 747 # define RE_SYNTAX_POSIX_MINIMAL_BASIC REG_SYNTAX_POSIX_MINIMAL_BASIC
 748 # define RE_SYNTAX_POSIX_MINIMAL_EXTENDED REG_SYNTAX_POSIX_MINIMAL_EXTENDED
 749 # define RE_SYNTAX_SED REG_SYNTAX_SED
 750 # define RE_UNMATCHED_RIGHT_PAREN_ORD REG_UNMATCHED_RIGHT_PAREN_ORD
 751 # ifndef RE_TRANSLATE_TYPE
 752 #  define RE_TRANSLATE_TYPE REG_TRANSLATE_TYPE
 753 # endif
 754
 755 #endif /* defined _REGEX_SOURCE */
 756
 757 #ifdef __cplusplus
 758 }
 759 #endif  /* C++ */
 760
 761 #endif /* regex.h */
 762 \f
 763 /*
 764 Local variables:
 765 make-backup-files: t
 766 version-control: t
 767 trim-versions-without-asking: nil
 768 End:
 769 */