posix/regex.h

   1 /* Definitions for data structures and routines for the regular
   2    expression library.
   3    Copyright (C) 1985, 1989-2017 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   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_H
  21 #define _REGEX_H 1
  22
  23 #include <sys/types.h>
  24
  25 /* Allow the use in C++ code.  */
  26 #ifdef __cplusplus
  27 extern "C" {
  28 #endif
  29
  30 /* The following two types have to be signed and unsigned integer type
  31    wide enough to hold a value of a pointer.  For most ANSI compilers
  32    ptrdiff_t and size_t should be likely OK.  Still size of these two
  33    types is 2 for Microsoft C.  Ugh... */
  34 typedef long int s_reg_t;
  35 typedef unsigned long int active_reg_t;
  36
  37 /* The following bits are used to determine the regexp syntax we
  38    recognize.  The set/not-set meanings are chosen so that Emacs syntax
  39    remains the value 0.  The bits are given in alphabetical order, and
  40    the definitions shifted by one from the previous bit; thus, when we
  41    add or remove a bit, only one other definition need change.  */
  42 typedef unsigned long int reg_syntax_t;
  43
  44 #ifdef __USE_GNU
  45 /* If this bit is not set, then \ inside a bracket expression is literal.
  46    If set, then such a \ quotes the following character.  */
  47 # define RE_BACKSLASH_ESCAPE_IN_LISTS ((unsigned long int) 1)
  48
  49 /* If this bit is not set, then + and ? are operators, and \+ and \? are
  50      literals.
  51    If set, then \+ and \? are operators and + and ? are literals.  */
  52 # define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)
  53
  54 /* If this bit is set, then character classes are supported.  They are:
  55      [:alpha:], [:upper:], [:lower:],  [:digit:], [:alnum:], [:xdigit:],
  56      [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:].
  57    If not set, then character classes are not supported.  */
  58 # define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1)
  59
  60 /* If this bit is set, then ^ and $ are always anchors (outside bracket
  61      expressions, of course).
  62    If this bit is not set, then it depends:
  63         ^  is an anchor if it is at the beginning of a regular
  64            expression or after an open-group or an alternation operator;
  65         $  is an anchor if it is at the end of a regular expression, or
  66            before a close-group or an alternation operator.
  67
  68    This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because
  69    POSIX draft 11.2 says that * etc. in leading positions is undefined.
  70    We already implemented a previous draft which made those constructs
  71    invalid, though, so we haven't changed the code back.  */
  72 # define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1)
  73
  74 /* If this bit is set, then special characters are always special
  75      regardless of where they are in the pattern.
  76    If this bit is not set, then special characters are special only in
  77      some contexts; otherwise they are ordinary.  Specifically,
  78      * + ? and intervals are only special when not after the beginning,
  79      open-group, or alternation operator.  */
  80 # define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1)
  81
  82 /* If this bit is set, then *, +, ?, and { cannot be first in an re or
  83      immediately after an alternation or begin-group operator.  */
  84 # define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1)
  85
  86 /* If this bit is set, then . matches newline.
  87    If not set, then it doesn't.  */
  88 # define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1)
  89
  90 /* If this bit is set, then . doesn't match NUL.
  91    If not set, then it does.  */
  92 # define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1)
  93
  94 /* If this bit is set, nonmatching lists [^...] do not match newline.
  95    If not set, they do.  */
  96 # define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1)
  97
  98 /* If this bit is set, either \{...\} or {...} defines an
  99      interval, depending on RE_NO_BK_BRACES.
 100    If not set, \{, \}, {, and } are literals.  */
 101 # define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1)
 102
 103 /* If this bit is set, +, ? and | aren't recognized as operators.
 104    If not set, they are.  */
 105 # define RE_LIMITED_OPS (RE_INTERVALS << 1)
 106
 107 /* If this bit is set, newline is an alternation operator.
 108    If not set, newline is literal.  */
 109 # define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1)
 110
 111 /* If this bit is set, then `{...}' defines an interval, and \{ and \}
 112      are literals.
 113   If not set, then `\{...\}' defines an interval.  */
 114 # define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1)
 115
 116 /* If this bit is set, (...) defines a group, and \( and \) are literals.
 117    If not set, \(...\) defines a group, and ( and ) are literals.  */
 118 # define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1)
 119
 120 /* If this bit is set, then \<digit> matches <digit>.
 121    If not set, then \<digit> is a back-reference.  */
 122 # define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1)
 123
 124 /* If this bit is set, then | is an alternation operator, and \| is literal.
 125    If not set, then \| is an alternation operator, and | is literal.  */
 126 # define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1)
 127
 128 /* If this bit is set, then an ending range point collating higher
 129      than the starting range point, as in [z-a], is invalid.
 130    If not set, then when ending range point collates higher than the
 131      starting range point, the range is ignored.  */
 132 # define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1)
 133
 134 /* If this bit is set, then an unmatched ) is ordinary.
 135    If not set, then an unmatched ) is invalid.  */
 136 # define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1)
 137
 138 /* If this bit is set, succeed as soon as we match the whole pattern,
 139    without further backtracking.  */
 140 # define RE_NO_POSIX_BACKTRACKING (RE_UNMATCHED_RIGHT_PAREN_ORD << 1)
 141
 142 /* If this bit is set, do not process the GNU regex operators.
 143    If not set, then the GNU regex operators are recognized. */
 144 # define RE_NO_GNU_OPS (RE_NO_POSIX_BACKTRACKING << 1)
 145
 146 /* If this bit is set, turn on internal regex debugging.
 147    If not set, and debugging was on, turn it off.
 148    This only works if regex.c is compiled -DDEBUG.
 149    We define this bit always, so that all that's needed to turn on
 150    debugging is to recompile regex.c; the calling code can always have
 151    this bit set, and it won't affect anything in the normal case. */
 152 # define RE_DEBUG (RE_NO_GNU_OPS << 1)
 153
 154 /* If this bit is set, a syntactically invalid interval is treated as
 155    a string of ordinary characters.  For example, the ERE 'a{1' is
 156    treated as 'a\{1'.  */
 157 # define RE_INVALID_INTERVAL_ORD (RE_DEBUG << 1)
 158
 159 /* If this bit is set, then ignore case when matching.
 160    If not set, then case is significant.  */
 161 # define RE_ICASE (RE_INVALID_INTERVAL_ORD << 1)
 162
 163 /* This bit is used internally like RE_CONTEXT_INDEP_ANCHORS but only
 164    for ^, because it is difficult to scan the regex backwards to find
 165    whether ^ should be special.  */
 166 # define RE_CARET_ANCHORS_HERE (RE_ICASE << 1)
 167
 168 /* If this bit is set, then \{ cannot be first in an bre or
 169    immediately after an alternation or begin-group operator.  */
 170 # define RE_CONTEXT_INVALID_DUP (RE_CARET_ANCHORS_HERE << 1)
 171
 172 /* If this bit is set, then no_sub will be set to 1 during
 173    re_compile_pattern.  */
 174 # define RE_NO_SUB (RE_CONTEXT_INVALID_DUP << 1)
 175 #endif
 176
 177 /* This global variable defines the particular regexp syntax to use (for
 178    some interfaces).  When a regexp is compiled, the syntax used is
 179    stored in the pattern buffer, so changing this does not affect
 180    already-compiled regexps.  */
 181 extern reg_syntax_t re_syntax_options;
 182 \f
 183 #ifdef __USE_GNU
 184 /* Define combinations of the above bits for the standard possibilities.
 185    (The [[[ comments delimit what gets put into the Texinfo file, so
 186    don't delete them!)  */
 187 /* [[[begin syntaxes]]] */
 188 #define RE_SYNTAX_EMACS 0
 189
 190 #define RE_SYNTAX_AWK                                                   \
 191   (RE_BACKSLASH_ESCAPE_IN_LISTS   | RE_DOT_NOT_NULL                     \
 192    | RE_NO_BK_PARENS              | RE_NO_BK_REFS                       \
 193    | RE_NO_BK_VBAR                | RE_NO_EMPTY_RANGES                  \
 194    | RE_DOT_NEWLINE               | RE_CONTEXT_INDEP_ANCHORS            \
 195    | RE_CHAR_CLASSES                                                    \
 196    | RE_UNMATCHED_RIGHT_PAREN_ORD | RE_NO_GNU_OPS)
 197
 198 #define RE_SYNTAX_GNU_AWK                                               \
 199   ((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS             \
 200     | RE_INVALID_INTERVAL_ORD)                                          \
 201    & ~(RE_DOT_NOT_NULL | RE_CONTEXT_INDEP_OPS                           \
 202       | RE_CONTEXT_INVALID_OPS ))
 203
 204 #define RE_SYNTAX_POSIX_AWK                                             \
 205   (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS              \
 206    | RE_INTERVALS           | RE_NO_GNU_OPS                             \
 207    | RE_INVALID_INTERVAL_ORD)
 208
 209 #define RE_SYNTAX_GREP                                                  \
 210   (RE_BK_PLUS_QM              | RE_CHAR_CLASSES                         \
 211    | RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS                            \
 212    | RE_NEWLINE_ALT)
 213
 214 #define RE_SYNTAX_EGREP                                                 \
 215   (RE_CHAR_CLASSES        | RE_CONTEXT_INDEP_ANCHORS                    \
 216    | RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE                    \
 217    | RE_NEWLINE_ALT       | RE_NO_BK_PARENS                             \
 218    | RE_NO_BK_VBAR)
 219
 220 #define RE_SYNTAX_POSIX_EGREP                                           \
 221   (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES                     \
 222    | RE_INVALID_INTERVAL_ORD)
 223
 224 /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff.  */
 225 #define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC
 226
 227 #define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC
 228
 229 /* Syntax bits common to both basic and extended POSIX regex syntax.  */
 230 #define _RE_SYNTAX_POSIX_COMMON                                         \
 231   (RE_CHAR_CLASSES | RE_DOT_NEWLINE      | RE_DOT_NOT_NULL              \
 232    | RE_INTERVALS  | RE_NO_EMPTY_RANGES)
 233
 234 #define RE_SYNTAX_POSIX_BASIC                                           \
 235   (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM | RE_CONTEXT_INVALID_DUP)
 236
 237 /* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes
 238    RE_LIMITED_OPS, i.e., \? \+ \| are not recognized.  Actually, this
 239    isn't minimal, since other operators, such as \`, aren't disabled.  */
 240 #define RE_SYNTAX_POSIX_MINIMAL_BASIC                                   \
 241   (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS)
 242
 243 #define RE_SYNTAX_POSIX_EXTENDED                                        \
 244   (_RE_SYNTAX_POSIX_COMMON  | RE_CONTEXT_INDEP_ANCHORS                  \
 245    | RE_CONTEXT_INDEP_OPS   | RE_NO_BK_BRACES                           \
 246    | RE_NO_BK_PARENS        | RE_NO_BK_VBAR                             \
 247    | RE_CONTEXT_INVALID_OPS | RE_UNMATCHED_RIGHT_PAREN_ORD)
 248
 249 /* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INDEP_OPS is
 250    removed and RE_NO_BK_REFS is added.  */
 251 #define RE_SYNTAX_POSIX_MINIMAL_EXTENDED                                \
 252   (_RE_SYNTAX_POSIX_COMMON  | RE_CONTEXT_INDEP_ANCHORS                  \
 253    | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES                           \
 254    | RE_NO_BK_PARENS        | RE_NO_BK_REFS                             \
 255    | RE_NO_BK_VBAR          | RE_UNMATCHED_RIGHT_PAREN_ORD)
 256 /* [[[end syntaxes]]] */
 257 \f
 258 /* Maximum number of duplicates an interval can allow.  Some systems
 259    (erroneously) define this in other header files, but we want our
 260    value, so remove any previous define.  */
 261 # ifdef RE_DUP_MAX
 262 #  undef RE_DUP_MAX
 263 # endif
 264 /* If sizeof(int) == 2, then ((1 << 15) - 1) overflows.  */
 265 # define RE_DUP_MAX (0x7fff)
 266 #endif
 267
 268
 269 /* POSIX `cflags' bits (i.e., information for `regcomp').  */
 270
 271 /* If this bit is set, then use extended regular expression syntax.
 272    If not set, then use basic regular expression syntax.  */
 273 #define REG_EXTENDED 1
 274
 275 /* If this bit is set, then ignore case when matching.
 276    If not set, then case is significant.  */
 277 #define REG_ICASE (REG_EXTENDED << 1)
 278
 279 /* If this bit is set, then anchors do not match at newline
 280      characters in the string.
 281    If not set, then anchors do match at newlines.  */
 282 #define REG_NEWLINE (REG_ICASE << 1)
 283
 284 /* If this bit is set, then report only success or fail in regexec.
 285    If not set, then returns differ between not matching and errors.  */
 286 #define REG_NOSUB (REG_NEWLINE << 1)
 287
 288
 289 /* POSIX `eflags' bits (i.e., information for regexec).  */
 290
 291 /* If this bit is set, then the beginning-of-line operator doesn't match
 292      the beginning of the string (presumably because it's not the
 293      beginning of a line).
 294    If not set, then the beginning-of-line operator does match the
 295      beginning of the string.  */
 296 #define REG_NOTBOL 1
 297
 298 /* Like REG_NOTBOL, except for the end-of-line.  */
 299 #define REG_NOTEOL (1 << 1)
 300
 301 /* Use PMATCH[0] to delimit the start and end of the search in the
 302    buffer.  */
 303 #define REG_STARTEND (1 << 2)
 304
 305
 306 /* If any error codes are removed, changed, or added, update the
 307    `re_error_msg' table in regex.c.  */
 308 typedef enum
 309 {
 310 #if defined _XOPEN_SOURCE || defined __USE_XOPEN2K
 311   REG_ENOSYS = -1,      /* This will never happen for this implementation.  */
 312 #endif
 313
 314   REG_NOERROR = 0,      /* Success.  */
 315   REG_NOMATCH,          /* Didn't find a match (for regexec).  */
 316
 317   /* POSIX regcomp return error codes.  (In the order listed in the
 318      standard.)  */
 319   REG_BADPAT,           /* Invalid pattern.  */
 320   REG_ECOLLATE,         /* Inalid collating element.  */
 321   REG_ECTYPE,           /* Invalid character class name.  */
 322   REG_EESCAPE,          /* Trailing backslash.  */
 323   REG_ESUBREG,          /* Invalid back reference.  */
 324   REG_EBRACK,           /* Unmatched left bracket.  */
 325   REG_EPAREN,           /* Parenthesis imbalance.  */
 326   REG_EBRACE,           /* Unmatched \{.  */
 327   REG_BADBR,            /* Invalid contents of \{\}.  */
 328   REG_ERANGE,           /* Invalid range end.  */
 329   REG_ESPACE,           /* Ran out of memory.  */
 330   REG_BADRPT,           /* No preceding re for repetition op.  */
 331
 332   /* Error codes we've added.  */
 333   REG_EEND,             /* Premature end.  */
 334   REG_ESIZE,            /* Compiled pattern bigger than 2^16 bytes.  */
 335   REG_ERPAREN           /* Unmatched ) or \); not returned from regcomp.  */
 336 } reg_errcode_t;
 337 \f
 338 /* This data structure represents a compiled pattern.  Before calling
 339    the pattern compiler, the fields `buffer', `allocated', `fastmap',
 340    and `translate' can be set.  After the pattern has been compiled,
 341    the fields `re_nsub', `not_bol' and `not_eol' are available.  All
 342    other fields are private to the regex routines.  */
 343
 344 #ifndef RE_TRANSLATE_TYPE
 345 # define __RE_TRANSLATE_TYPE unsigned char *
 346 # ifdef __USE_GNU
 347 #  define RE_TRANSLATE_TYPE __RE_TRANSLATE_TYPE
 348 # endif
 349 #endif
 350
 351 #ifdef __USE_GNU
 352 # define __REPB_PREFIX(name) name
 353 #else
 354 # define __REPB_PREFIX(name) __##name
 355 #endif
 356
 357 struct re_pattern_buffer
 358 {
 359   /* Space that holds the compiled pattern.  It is declared as
 360      `unsigned char *' because its elements are sometimes used as
 361      array indexes.  */
 362   unsigned char *__REPB_PREFIX(buffer);
 363
 364   /* Number of bytes to which `buffer' points.  */
 365   unsigned long int __REPB_PREFIX(allocated);
 366
 367   /* Number of bytes actually used in `buffer'.  */
 368   unsigned long int __REPB_PREFIX(used);
 369
 370   /* Syntax setting with which the pattern was compiled.  */
 371   reg_syntax_t __REPB_PREFIX(syntax);
 372
 373   /* Pointer to a fastmap, if any, otherwise zero.  re_search uses the
 374      fastmap, if there is one, to skip over impossible starting points
 375      for matches.  */
 376   char *__REPB_PREFIX(fastmap);
 377
 378   /* Either a translate table to apply to all characters before
 379      comparing them, or zero for no translation.  The translation is
 380      applied to a pattern when it is compiled and to a string when it
 381      is matched.  */
 382   __RE_TRANSLATE_TYPE __REPB_PREFIX(translate);
 383
 384   /* Number of subexpressions found by the compiler.  */
 385   size_t re_nsub;
 386
 387   /* Zero if this pattern cannot match the empty string, one else.
 388      Well, in truth it's used only in `re_search_2', to see whether or
 389      not we should use the fastmap, so we don't set this absolutely
 390      perfectly; see `re_compile_fastmap' (the `duplicate' case).  */
 391   unsigned __REPB_PREFIX(can_be_null) : 1;
 392
 393   /* If REGS_UNALLOCATED, allocate space in the `regs' structure
 394      for `max (RE_NREGS, re_nsub + 1)' groups.
 395      If REGS_REALLOCATE, reallocate space if necessary.
 396      If REGS_FIXED, use what's there.  */
 397 #ifdef __USE_GNU
 398 # define REGS_UNALLOCATED 0
 399 # define REGS_REALLOCATE 1
 400 # define REGS_FIXED 2
 401 #endif
 402   unsigned __REPB_PREFIX(regs_allocated) : 2;
 403
 404   /* Set to zero when `regex_compile' compiles a pattern; set to one
 405      by `re_compile_fastmap' if it updates the fastmap.  */
 406   unsigned __REPB_PREFIX(fastmap_accurate) : 1;
 407
 408   /* If set, `re_match_2' does not return information about
 409      subexpressions.  */
 410   unsigned __REPB_PREFIX(no_sub) : 1;
 411
 412   /* If set, a beginning-of-line anchor doesn't match at the beginning
 413      of the string.  */
 414   unsigned __REPB_PREFIX(not_bol) : 1;
 415
 416   /* Similarly for an end-of-line anchor.  */
 417   unsigned __REPB_PREFIX(not_eol) : 1;
 418
 419   /* If true, an anchor at a newline matches.  */
 420   unsigned __REPB_PREFIX(newline_anchor) : 1;
 421 };
 422
 423 typedef struct re_pattern_buffer regex_t;
 424 \f
 425 /* Type for byte offsets within the string.  POSIX mandates this.  */
 426 typedef int regoff_t;
 427
 428
 429 #ifdef __USE_GNU
 430 /* This is the structure we store register match data in.  See
 431    regex.texinfo for a full description of what registers match.  */
 432 struct re_registers
 433 {
 434   unsigned num_regs;
 435   regoff_t *start;
 436   regoff_t *end;
 437 };
 438
 439
 440 /* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer,
 441    `re_match_2' returns information about at least this many registers
 442    the first time a `regs' structure is passed.  */
 443 # ifndef RE_NREGS
 444 #  define RE_NREGS 30
 445 # endif
 446 #endif
 447
 448
 449 /* POSIX specification for registers.  Aside from the different names than
 450    `re_registers', POSIX uses an array of structures, instead of a
 451    structure of arrays.  */
 452 typedef struct
 453 {
 454   regoff_t rm_so;  /* Byte offset from string's start to substring's start.  */
 455   regoff_t rm_eo;  /* Byte offset from string's start to substring's end.  */
 456 } regmatch_t;
 457 \f
 458 /* Declarations for routines.  */
 459
 460 #ifdef __USE_GNU
 461 /* Sets the current default syntax to SYNTAX, and return the old syntax.
 462    You can also simply assign to the `re_syntax_options' variable.  */
 463 extern reg_syntax_t re_set_syntax (reg_syntax_t __syntax);
 464
 465 /* Compile the regular expression PATTERN, with length LENGTH
 466    and syntax given by the global `re_syntax_options', into the buffer
 467    BUFFER.  Return NULL if successful, and an error string if not.
 468
 469    To free the allocated storage, you must call `regfree' on BUFFER.
 470    Note that the translate table must either have been initialised by
 471    `regcomp', with a malloc'ed value, or set to NULL before calling
 472    `regfree'.  */
 473 extern const char *re_compile_pattern (const char *__pattern, size_t __length,
 474                                        struct re_pattern_buffer *__buffer);
 475
 476
 477 /* Compile a fastmap for the compiled pattern in BUFFER; used to
 478    accelerate searches.  Return 0 if successful and -2 if was an
 479    internal error.  */
 480 extern int re_compile_fastmap (struct re_pattern_buffer *__buffer);
 481
 482
 483 /* Search in the string STRING (with length LENGTH) for the pattern
 484    compiled into BUFFER.  Start searching at position START, for RANGE
 485    characters.  Return the starting position of the match, -1 for no
 486    match, or -2 for an internal error.  Also return register
 487    information in REGS (if REGS and BUFFER->no_sub are nonzero).  */
 488 extern int re_search (struct re_pattern_buffer *__buffer, const char *__string,
 489                       int __length, int __start, int __range,
 490                       struct re_registers *__regs);
 491
 492
 493 /* Like `re_search', but search in the concatenation of STRING1 and
 494    STRING2.  Also, stop searching at index START + STOP.  */
 495 extern int re_search_2 (struct re_pattern_buffer *__buffer,
 496                         const char *__string1, int __length1,
 497                         const char *__string2, int __length2, int __start,
 498                         int __range, struct re_registers *__regs, int __stop);
 499
 500
 501 /* Like `re_search', but return how many characters in STRING the regexp
 502    in BUFFER matched, starting at position START.  */
 503 extern int re_match (struct re_pattern_buffer *__buffer, const char *__string,
 504                      int __length, int __start, struct re_registers *__regs);
 505
 506
 507 /* Relates to `re_match' as `re_search_2' relates to `re_search'.  */
 508 extern int re_match_2 (struct re_pattern_buffer *__buffer,
 509                        const char *__string1, int __length1,
 510                        const char *__string2, int __length2, int __start,
 511                        struct re_registers *__regs, int __stop);
 512
 513
 514 /* Set REGS to hold NUM_REGS registers, storing them in STARTS and
 515    ENDS.  Subsequent matches using BUFFER and REGS will use this memory
 516    for recording register information.  STARTS and ENDS must be
 517    allocated with malloc, and must each be at least `NUM_REGS * sizeof
 518    (regoff_t)' bytes long.
 519
 520    If NUM_REGS == 0, then subsequent matches should allocate their own
 521    register data.
 522
 523    Unless this function is called, the first search or match using
 524    PATTERN_BUFFER will allocate its own register data, without
 525    freeing the old data.  */
 526 extern void re_set_registers (struct re_pattern_buffer *__buffer,
 527                               struct re_registers *__regs,
 528                               unsigned int __num_regs,
 529                               regoff_t *__starts, regoff_t *__ends);
 530 #endif  /* Use GNU */
 531
 532 #if defined _REGEX_RE_COMP || (defined _LIBC && defined __USE_MISC)
 533 # ifndef _CRAY
 534 /* 4.2 bsd compatibility.  */
 535 extern char *re_comp (const char *);
 536 extern int re_exec (const char *);
 537 # endif
 538 #endif
 539
 540 /* GCC 2.95 and later have "__restrict"; C99 compilers have
 541    "restrict", and "configure" may have defined "restrict".  */
 542 #ifndef __restrict
 543 # if ! (2 < __GNUC__ || (2 == __GNUC__ && 95 <= __GNUC_MINOR__))
 544 #  if defined restrict || 199901L <= __STDC_VERSION__
 545 #   define __restrict restrict
 546 #  else
 547 #   define __restrict
 548 #  endif
 549 # endif
 550 #endif
 551 /* gcc 3.1 and up support the [restrict] syntax.  */
 552 #ifndef __restrict_arr
 553 # if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)) \
 554      && !defined __GNUG__
 555 #  define __restrict_arr __restrict
 556 # else
 557 #  define __restrict_arr
 558 # endif
 559 #endif
 560
 561 /* POSIX compatibility.  */
 562 extern int regcomp (regex_t *__restrict __preg,
 563                     const char *__restrict __pattern,
 564                     int __cflags);
 565
 566 extern int regexec (const regex_t *__restrict __preg,
 567                     const char *__restrict __string, size_t __nmatch,
 568                     regmatch_t __pmatch[__restrict_arr],
 569                     int __eflags);
 570
 571 extern size_t regerror (int __errcode, const regex_t *__restrict __preg,
 572                         char *__restrict __errbuf, size_t __errbuf_size);
 573
 574 extern void regfree (regex_t *__preg);
 575
 576
 577 #ifdef __cplusplus
 578 }
 579 #endif  /* C++ */
 580
 581 #endif /* regex.h */