include/xregex2.h

   1 /* Definitions for data structures and routines for the regular
   2    expression library, version 0.12.
   3
   4    Copyright (C) 1985-2022 Free Software Foundation, Inc.
   5
   6    This file is part of the GNU C Library.  Its master source is NOT part of
   7    the C library, however.  The master source lives in /gd/gnu/lib.
   8
   9    The GNU C Library is free software; you can redistribute it and/or
  10    modify it under the terms of the GNU Lesser General Public
  11    License as published by the Free Software Foundation; either
  12    version 2.1 of the License, or (at your option) any later version.
  13
  14    The GNU C Library is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17    Lesser General Public License for more details.
  18
  19    You should have received a copy of the GNU Lesser General Public
  20    License along with the GNU C Library; if not, write to the Free
  21    Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  22    02110-1301 USA.  */
  23
  24 #ifndef _REGEX_H
  25 #define _REGEX_H 1
  26
  27 /* Allow the use in C++ code.  */
  28 #ifdef __cplusplus
  29 extern "C" {
  30 #endif
  31
  32 /* POSIX says that <sys/types.h> must be included (by the caller) before
  33    <regex.h>.  */
  34
  35 #if !defined _POSIX_C_SOURCE && !defined _POSIX_SOURCE && defined VMS
  36 /* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it
  37    should be there.  */
  38 # include <stddef.h>
  39 #endif
  40
  41 /* The following two types have to be signed and unsigned integer type
  42    wide enough to hold a value of a pointer.  For most ANSI compilers
  43    ptrdiff_t and size_t should be likely OK.  Still size of these two
  44    types is 2 for Microsoft C.  Ugh... */
  45 typedef long int s_reg_t;
  46 typedef unsigned long int active_reg_t;
  47
  48 /* The following bits are used to determine the regexp syntax we
  49    recognize.  The set/not-set meanings are chosen so that Emacs syntax
  50    remains the value 0.  The bits are given in alphabetical order, and
  51    the definitions shifted by one from the previous bit; thus, when we
  52    add or remove a bit, only one other definition need change.  */
  53 typedef unsigned long int reg_syntax_t;
  54
  55 /* If this bit is not set, then \ inside a bracket expression is literal.
  56    If set, then such a \ quotes the following character.  */
  57 #define RE_BACKSLASH_ESCAPE_IN_LISTS ((unsigned long int) 1)
  58
  59 /* If this bit is not set, then + and ? are operators, and \+ and \? are
  60      literals.
  61    If set, then \+ and \? are operators and + and ? are literals.  */
  62 #define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)
  63
  64 /* If this bit is set, then character classes are supported.  They are:
  65      [:alpha:], [:upper:], [:lower:],  [:digit:], [:alnum:], [:xdigit:],
  66      [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:].
  67    If not set, then character classes are not supported.  */
  68 #define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1)
  69
  70 /* If this bit is set, then ^ and $ are always anchors (outside bracket
  71      expressions, of course).
  72    If this bit is not set, then it depends:
  73         ^  is an anchor if it is at the beginning of a regular
  74            expression or after an open-group or an alternation operator;
  75         $  is an anchor if it is at the end of a regular expression, or
  76            before a close-group or an alternation operator.
  77
  78    This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because
  79    POSIX draft 11.2 says that * etc. in leading positions is undefined.
  80    We already implemented a previous draft which made those constructs
  81    invalid, though, so we haven't changed the code back.  */
  82 #define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1)
  83
  84 /* If this bit is set, then special characters are always special
  85      regardless of where they are in the pattern.
  86    If this bit is not set, then special characters are special only in
  87      some contexts; otherwise they are ordinary.  Specifically,
  88      * + ? and intervals are only special when not after the beginning,
  89      open-group, or alternation operator.  */
  90 #define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1)
  91
  92 /* If this bit is set, then *, +, ?, and { cannot be first in an re or
  93      immediately after an alternation or begin-group operator.  */
  94 #define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1)
  95
  96 /* If this bit is set, then . matches newline.
  97    If not set, then it doesn't.  */
  98 #define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1)
  99
 100 /* If this bit is set, then . doesn't match NUL.
 101    If not set, then it does.  */
 102 #define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1)
 103
 104 /* If this bit is set, nonmatching lists [^...] do not match newline.
 105    If not set, they do.  */
 106 #define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1)
 107
 108 /* If this bit is set, either \{...\} or {...} defines an
 109      interval, depending on RE_NO_BK_BRACES.
 110    If not set, \{, \}, {, and } are literals.  */
 111 #define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1)
 112
 113 /* If this bit is set, +, ? and | aren't recognized as operators.
 114    If not set, they are.  */
 115 #define RE_LIMITED_OPS (RE_INTERVALS << 1)
 116
 117 /* If this bit is set, newline is an alternation operator.
 118    If not set, newline is literal.  */
 119 #define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1)
 120
 121 /* If this bit is set, then `{...}' defines an interval, and \{ and \}
 122      are literals.
 123   If not set, then `\{...\}' defines an interval.  */
 124 #define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1)
 125
 126 /* If this bit is set, (...) defines a group, and \( and \) are literals.
 127    If not set, \(...\) defines a group, and ( and ) are literals.  */
 128 #define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1)
 129
 130 /* If this bit is set, then \<digit> matches <digit>.
 131    If not set, then \<digit> is a back-reference.  */
 132 #define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1)
 133
 134 /* If this bit is set, then | is an alternation operator, and \| is literal.
 135    If not set, then \| is an alternation operator, and | is literal.  */
 136 #define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1)
 137
 138 /* If this bit is set, then an ending range point collating higher
 139      than the starting range point, as in [z-a], is invalid.
 140    If not set, then when ending range point collates higher than the
 141      starting range point, the range is ignored.  */
 142 #define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1)
 143
 144 /* If this bit is set, then an unmatched ) is ordinary.
 145    If not set, then an unmatched ) is invalid.  */
 146 #define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1)
 147
 148 /* If this bit is set, succeed as soon as we match the whole pattern,
 149    without further backtracking.  */
 150 #define RE_NO_POSIX_BACKTRACKING (RE_UNMATCHED_RIGHT_PAREN_ORD << 1)
 151
 152 /* If this bit is set, do not process the GNU regex operators.
 153    If not set, then the GNU regex operators are recognized. */
 154 #define RE_NO_GNU_OPS (RE_NO_POSIX_BACKTRACKING << 1)
 155
 156 /* If this bit is set, turn on internal regex debugging.
 157    If not set, and debugging was on, turn it off.
 158    This only works if regex.c is compiled -DDEBUG.
 159    We define this bit always, so that all that's needed to turn on
 160    debugging is to recompile regex.c; the calling code can always have
 161    this bit set, and it won't affect anything in the normal case. */
 162 #define RE_DEBUG (RE_NO_GNU_OPS << 1)
 163
 164 /* If this bit is set, a syntactically invalid interval is treated as
 165    a string of ordinary characters.  For example, the ERE 'a{1' is
 166    treated as 'a\{1'.  */
 167 #define RE_INVALID_INTERVAL_ORD (RE_DEBUG << 1)
 168
 169 /* This global variable defines the particular regexp syntax to use (for
 170    some interfaces).  When a regexp is compiled, the syntax used is
 171    stored in the pattern buffer, so changing this does not affect
 172    already-compiled regexps.  */
 173 extern reg_syntax_t re_syntax_options;
 174 \f
 175 /* Define combinations of the above bits for the standard possibilities.
 176    (The [[[ comments delimit what gets put into the Texinfo file, so
 177    don't delete them!)  */
 178 /* [[[begin syntaxes]]] */
 179 #define RE_SYNTAX_EMACS 0
 180
 181 #define RE_SYNTAX_AWK                                                   \
 182   (RE_BACKSLASH_ESCAPE_IN_LISTS   | RE_DOT_NOT_NULL                     \
 183    | RE_NO_BK_PARENS              | RE_NO_BK_REFS                       \
 184    | RE_NO_BK_VBAR                | RE_NO_EMPTY_RANGES                  \
 185    | RE_DOT_NEWLINE               | RE_CONTEXT_INDEP_ANCHORS            \
 186    | RE_UNMATCHED_RIGHT_PAREN_ORD | RE_NO_GNU_OPS)
 187
 188 #define RE_SYNTAX_GNU_AWK                                               \
 189   ((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DEBUG) \
 190    & ~(RE_DOT_NOT_NULL | RE_INTERVALS | RE_CONTEXT_INDEP_OPS))
 191
 192 #define RE_SYNTAX_POSIX_AWK                                             \
 193   (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS              \
 194    | RE_INTERVALS           | RE_NO_GNU_OPS)
 195
 196 #define RE_SYNTAX_GREP                                                  \
 197   (RE_BK_PLUS_QM              | RE_CHAR_CLASSES                         \
 198    | RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS                            \
 199    | RE_NEWLINE_ALT)
 200
 201 #define RE_SYNTAX_EGREP                                                 \
 202   (RE_CHAR_CLASSES        | RE_CONTEXT_INDEP_ANCHORS                    \
 203    | RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE                    \
 204    | RE_NEWLINE_ALT       | RE_NO_BK_PARENS                             \
 205    | RE_NO_BK_VBAR)
 206
 207 #define RE_SYNTAX_POSIX_EGREP                                           \
 208   (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES                     \
 209    | RE_INVALID_INTERVAL_ORD)
 210
 211 /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff.  */
 212 #define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC
 213
 214 #define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC
 215
 216 /* Syntax bits common to both basic and extended POSIX regex syntax.  */
 217 #define _RE_SYNTAX_POSIX_COMMON                                         \
 218   (RE_CHAR_CLASSES | RE_DOT_NEWLINE      | RE_DOT_NOT_NULL              \
 219    | RE_INTERVALS  | RE_NO_EMPTY_RANGES)
 220
 221 #define RE_SYNTAX_POSIX_BASIC                                           \
 222   (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM)
 223
 224 /* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes
 225    RE_LIMITED_OPS, i.e., \? \+ \| are not recognized.  Actually, this
 226    isn't minimal, since other operators, such as \`, aren't disabled.  */
 227 #define RE_SYNTAX_POSIX_MINIMAL_BASIC                                   \
 228   (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS)
 229
 230 #define RE_SYNTAX_POSIX_EXTENDED                                        \
 231   (_RE_SYNTAX_POSIX_COMMON  | RE_CONTEXT_INDEP_ANCHORS                  \
 232    | RE_CONTEXT_INDEP_OPS   | RE_NO_BK_BRACES                           \
 233    | RE_NO_BK_PARENS        | RE_NO_BK_VBAR                             \
 234    | RE_CONTEXT_INVALID_OPS | RE_UNMATCHED_RIGHT_PAREN_ORD)
 235
 236 /* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INDEP_OPS is
 237    removed and RE_NO_BK_REFS is added.  */
 238 #define RE_SYNTAX_POSIX_MINIMAL_EXTENDED                                \
 239   (_RE_SYNTAX_POSIX_COMMON  | RE_CONTEXT_INDEP_ANCHORS                  \
 240    | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES                           \
 241    | RE_NO_BK_PARENS        | RE_NO_BK_REFS                             \
 242    | RE_NO_BK_VBAR          | RE_UNMATCHED_RIGHT_PAREN_ORD)
 243 /* [[[end syntaxes]]] */
 244 \f
 245 /* Maximum number of duplicates an interval can allow.  Some systems
 246    (erroneously) define this in other header files, but we want our
 247    value, so remove any previous define.  */
 248 #ifdef RE_DUP_MAX
 249 # undef RE_DUP_MAX
 250 #endif
 251 /* If sizeof(int) == 2, then ((1 << 15) - 1) overflows.  */
 252 #define RE_DUP_MAX (0x7fff)
 253
 254
 255 /* POSIX `cflags' bits (i.e., information for `regcomp').  */
 256
 257 /* If this bit is set, then use extended regular expression syntax.
 258    If not set, then use basic regular expression syntax.  */
 259 #define REG_EXTENDED 1
 260
 261 /* If this bit is set, then ignore case when matching.
 262    If not set, then case is significant.  */
 263 #define REG_ICASE (REG_EXTENDED << 1)
 264
 265 /* If this bit is set, then anchors do not match at newline
 266      characters in the string.
 267    If not set, then anchors do match at newlines.  */
 268 #define REG_NEWLINE (REG_ICASE << 1)
 269
 270 /* If this bit is set, then report only success or fail in regexec.
 271    If not set, then returns differ between not matching and errors.  */
 272 #define REG_NOSUB (REG_NEWLINE << 1)
 273
 274
 275 /* POSIX `eflags' bits (i.e., information for regexec).  */
 276
 277 /* If this bit is set, then the beginning-of-line operator doesn't match
 278      the beginning of the string (presumably because it's not the
 279      beginning of a line).
 280    If not set, then the beginning-of-line operator does match the
 281      beginning of the string.  */
 282 #define REG_NOTBOL 1
 283
 284 /* Like REG_NOTBOL, except for the end-of-line.  */
 285 #define REG_NOTEOL (1 << 1)
 286
 287
 288 /* If any error codes are removed, changed, or added, update the
 289    `re_error_msg' table in regex.c.  */
 290 typedef enum
 291 {
 292 #ifdef _XOPEN_SOURCE
 293   REG_ENOSYS = -1,      /* This will never happen for this implementation.  */
 294 #endif
 295
 296   REG_NOERROR = 0,      /* Success.  */
 297   REG_NOMATCH,          /* Didn't find a match (for regexec).  */
 298
 299   /* POSIX regcomp return error codes.  (In the order listed in the
 300      standard.)  */
 301   REG_BADPAT,           /* Invalid pattern.  */
 302   REG_ECOLLATE,         /* Not implemented.  */
 303   REG_ECTYPE,           /* Invalid character class name.  */
 304   REG_EESCAPE,          /* Trailing backslash.  */
 305   REG_ESUBREG,          /* Invalid back reference.  */
 306   REG_EBRACK,           /* Unmatched left bracket.  */
 307   REG_EPAREN,           /* Parenthesis imbalance.  */
 308   REG_EBRACE,           /* Unmatched \{.  */
 309   REG_BADBR,            /* Invalid contents of \{\}.  */
 310   REG_ERANGE,           /* Invalid range end.  */
 311   REG_ESPACE,           /* Ran out of memory.  */
 312   REG_BADRPT,           /* No preceding re for repetition op.  */
 313
 314   /* Error codes we've added.  */
 315   REG_EEND,             /* Premature end.  */
 316   REG_ESIZE,            /* Compiled pattern bigger than 2^16 bytes.  */
 317   REG_ERPAREN           /* Unmatched ) or \); not returned from regcomp.  */
 318 } reg_errcode_t;
 319 \f
 320 /* This data structure represents a compiled pattern.  Before calling
 321    the pattern compiler, the fields `buffer', `allocated', `fastmap',
 322    `translate', and `no_sub' can be set.  After the pattern has been
 323    compiled, the `re_nsub' field is available.  All other fields are
 324    private to the regex routines.  */
 325
 326 #ifndef RE_TRANSLATE_TYPE
 327 # define RE_TRANSLATE_TYPE char *
 328 #endif
 329
 330 struct re_pattern_buffer
 331 {
 332 /* [[[begin pattern_buffer]]] */
 333         /* Space that holds the compiled pattern.  It is declared as
 334           `unsigned char *' because its elements are
 335            sometimes used as array indexes.  */
 336   unsigned char *buffer;
 337
 338         /* Number of bytes to which `buffer' points.  */
 339   unsigned long int allocated;
 340
 341         /* Number of bytes actually used in `buffer'.  */
 342   unsigned long int used;
 343
 344         /* Syntax setting with which the pattern was compiled.  */
 345   reg_syntax_t syntax;
 346
 347         /* Pointer to a fastmap, if any, otherwise zero.  re_search uses
 348            the fastmap, if there is one, to skip over impossible
 349            starting points for matches.  */
 350   char *fastmap;
 351
 352         /* Either a translate table to apply to all characters before
 353            comparing them, or zero for no translation.  The translation
 354            is applied to a pattern when it is compiled and to a string
 355            when it is matched.  */
 356   RE_TRANSLATE_TYPE translate;
 357
 358         /* Number of subexpressions found by the compiler.  */
 359   size_t re_nsub;
 360
 361         /* Zero if this pattern cannot match the empty string, one else.
 362            Well, in truth it's used only in `re_search_2', to see
 363            whether or not we should use the fastmap, so we don't set
 364            this absolutely perfectly; see `re_compile_fastmap' (the
 365            `duplicate' case).  */
 366   unsigned can_be_null : 1;
 367
 368         /* If REGS_UNALLOCATED, allocate space in the `regs' structure
 369              for `max (RE_NREGS, re_nsub + 1)' groups.
 370            If REGS_REALLOCATE, reallocate space if necessary.
 371            If REGS_FIXED, use what's there.  */
 372 #define REGS_UNALLOCATED 0
 373 #define REGS_REALLOCATE 1
 374 #define REGS_FIXED 2
 375   unsigned regs_allocated : 2;
 376
 377         /* Set to zero when `regex_compile' compiles a pattern; set to one
 378            by `re_compile_fastmap' if it updates the fastmap.  */
 379   unsigned fastmap_accurate : 1;
 380
 381         /* If set, `re_match_2' does not return information about
 382            subexpressions.  */
 383   unsigned no_sub : 1;
 384
 385         /* If set, a beginning-of-line anchor doesn't match at the
 386            beginning of the string.  */
 387   unsigned not_bol : 1;
 388
 389         /* Similarly for an end-of-line anchor.  */
 390   unsigned not_eol : 1;
 391
 392         /* If true, an anchor at a newline matches.  */
 393   unsigned newline_anchor : 1;
 394
 395 /* [[[end pattern_buffer]]] */
 396 };
 397
 398 typedef struct re_pattern_buffer regex_t;
 399 \f
 400 /* Type for byte offsets within the string.  POSIX mandates this.  */
 401 typedef int regoff_t;
 402
 403
 404 /* This is the structure we store register match data in.  See
 405    regex.texinfo for a full description of what registers match.  */
 406 struct re_registers
 407 {
 408   unsigned num_regs;
 409   regoff_t *start;
 410   regoff_t *end;
 411 };
 412
 413
 414 /* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer,
 415    `re_match_2' returns information about at least this many registers
 416    the first time a `regs' structure is passed.  */
 417 #ifndef RE_NREGS
 418 # define RE_NREGS 30
 419 #endif
 420
 421
 422 /* POSIX specification for registers.  Aside from the different names than
 423    `re_registers', POSIX uses an array of structures, instead of a
 424    structure of arrays.  */
 425 typedef struct
 426 {
 427   regoff_t rm_so;  /* Byte offset from string's start to substring's start.  */
 428   regoff_t rm_eo;  /* Byte offset from string's start to substring's end.  */
 429 } regmatch_t;
 430 \f
 431 /* Declarations for routines.  */
 432
 433 /* To avoid duplicating every routine declaration -- once with a
 434    prototype (if we are ANSI), and once without (if we aren't) -- we
 435    use the following macro to declare argument types.  This
 436    unfortunately clutters up the declarations a bit, but I think it's
 437    worth it.  */
 438
 439 /* Sets the current default syntax to SYNTAX, and return the old syntax.
 440    You can also simply assign to the `re_syntax_options' variable.  */
 441 extern reg_syntax_t re_set_syntax (reg_syntax_t syntax);
 442
 443 /* Compile the regular expression PATTERN, with length LENGTH
 444    and syntax given by the global `re_syntax_options', into the buffer
 445    BUFFER.  Return NULL if successful, and an error string if not.  */
 446 extern const char *re_compile_pattern (const char *pattern, size_t length,
 447                                        struct re_pattern_buffer *buffer);
 448
 449
 450 /* Compile a fastmap for the compiled pattern in BUFFER; used to
 451    accelerate searches.  Return 0 if successful and -2 if was an
 452    internal error.  */
 453 extern int re_compile_fastmap (struct re_pattern_buffer *buffer);
 454
 455
 456 /* Search in the string STRING (with length LENGTH) for the pattern
 457    compiled into BUFFER.  Start searching at position START, for RANGE
 458    characters.  Return the starting position of the match, -1 for no
 459    match, or -2 for an internal error.  Also return register
 460    information in REGS (if REGS and BUFFER->no_sub are nonzero).  */
 461 extern int re_search (struct re_pattern_buffer *buffer, const char *string,
 462                       int length, int start, int range,
 463                       struct re_registers *regs);
 464
 465
 466 /* Like `re_search', but search in the concatenation of STRING1 and
 467    STRING2.  Also, stop searching at index START + STOP.  */
 468 extern int re_search_2 (struct re_pattern_buffer *buffer, const char *string1,
 469                         int length1, const char *string2, int length2,
 470                         int start, int range, struct re_registers *regs,
 471                         int stop);
 472
 473
 474 /* Like `re_search', but return how many characters in STRING the regexp
 475    in BUFFER matched, starting at position START.  */
 476 extern int re_match (struct re_pattern_buffer *buffer, const char *string,
 477                      int length, int start, struct re_registers *regs);
 478
 479
 480 /* Relates to `re_match' as `re_search_2' relates to `re_search'.  */
 481 extern int re_match_2 (struct re_pattern_buffer *buffer, const char *string1,
 482                        int length1, const char *string2, int length2,
 483                        int start, struct re_registers *regs, int stop);
 484
 485
 486 /* Set REGS to hold NUM_REGS registers, storing them in STARTS and
 487    ENDS.  Subsequent matches using BUFFER and REGS will use this memory
 488    for recording register information.  STARTS and ENDS must be
 489    allocated with malloc, and must each be at least `NUM_REGS * sizeof
 490    (regoff_t)' bytes long.
 491
 492    If NUM_REGS == 0, then subsequent matches should allocate their own
 493    register data.
 494
 495    Unless this function is called, the first search or match using
 496    PATTERN_BUFFER will allocate its own register data, without
 497    freeing the old data.  */
 498 extern void re_set_registers (struct re_pattern_buffer *buffer,
 499                               struct re_registers *regs,
 500                               unsigned num_regs, regoff_t *starts,
 501                               regoff_t *ends);
 502
 503 #if defined _REGEX_RE_COMP || defined _LIBC
 504 # ifndef _CRAY
 505 /* 4.2 bsd compatibility.  */
 506 extern char *re_comp (const char *);
 507 extern int re_exec (const char *);
 508 # endif
 509 #endif
 510
 511 /* GCC 2.95 and later have "__restrict"; C99 compilers have
 512    "restrict", and "configure" may have defined "restrict".  */
 513 #ifndef __restrict
 514 # if ! (2 < __GNUC__ || (2 == __GNUC__ && 95 <= __GNUC_MINOR__))
 515 #  if defined restrict || 199901L <= __STDC_VERSION__
 516 #   define __restrict restrict
 517 #  else
 518 #   define __restrict
 519 #  endif
 520 # endif
 521 #endif
 522
 523 /* GCC 3.1 and later support declaring arrays as non-overlapping
 524    using the syntax array_name[restrict]  */
 525 #ifndef __restrict_arr
 526 # if ! (3 < __GNUC__ || (3 == __GNUC__ && 1 <= __GNUC_MINOR__)) || defined (__GNUG__)
 527 #  define __restrict_arr
 528 # else
 529 #  define __restrict_arr __restrict
 530 # endif
 531 #endif
 532
 533 /* POSIX compatibility.  */
 534 extern int regcomp (regex_t *__restrict __preg,
 535                     const char *__restrict __pattern,
 536                     int __cflags);
 537
 538 #if (__GNUC__)
 539 __extension__
 540 #endif
 541 extern int regexec (const regex_t *__restrict __preg,
 542                     const char *__restrict __string, size_t __nmatch,
 543                     regmatch_t __pmatch[__restrict_arr],
 544                     int __eflags);
 545
 546 extern size_t regerror (int __errcode, const regex_t *__preg,
 547                         char *__errbuf, size_t __errbuf_size);
 548
 549 extern void regfree (regex_t *__preg);
 550
 551
 552 #ifdef __cplusplus
 553 }
 554 #endif  /* C++ */
 555
 556 #endif /* regex.h */
 557 \f
 558 /*
 559 Local variables:
 560 make-backup-files: t
 561 version-control: t
 562 trim-versions-without-asking: nil
 563 End:
 564 */