misc/regexp.c

   1 /* Define function and variables for the obsolete <regexp.h> interface.
   2    Copyright (C) 1996-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   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 /* We don't include regexp.h here because of the macros it requires, and
  21    because it now contains an unconditional #warning.  */
  22
  23 #include <regex.h>
  24
  25 /* Define the variables used for the interface.  */
  26 char *loc1;
  27 char *loc2;
  28
  29 /* Although we do not support the use we define this variable as well.  */
  30 char *locs;
  31
  32
  33 /* Find the next match in STRING.  The compiled regular expression is
  34    found in the buffer starting at EXPBUF.  `loc1' will return the
  35    first character matched and `loc2' points to the next unmatched
  36    character.  */
  37 int
  38 __step (const char *string, const char *expbuf)
  39 {
  40   regmatch_t match;     /* We only need info about the full match.  */
  41
  42   expbuf += __alignof (regex_t *);
  43   expbuf -= (expbuf - ((const char *) 0)) % __alignof__ (regex_t *);
  44
  45   if (__regexec ((const regex_t *) expbuf, string, 1, &match, REG_NOTEOL)
  46       == REG_NOMATCH)
  47     return 0;
  48
  49   loc1 = (char *) string + match.rm_so;
  50   loc2 = (char *) string + match.rm_eo;
  51   return 1;
  52 }
  53 weak_alias (__step, step)
  54
  55
  56 /* Match the beginning of STRING with the compiled regular expression
  57    in EXPBUF.  If the match is successful `loc2' will contain the
  58    position of the first unmatched character.  */
  59 int
  60 __advance (const char *string, const char *expbuf)
  61 {
  62   regmatch_t match;     /* We only need info about the full match.  */
  63
  64   expbuf += __alignof__ (regex_t *);
  65   expbuf -= (expbuf - ((const char *) 0)) % __alignof__ (regex_t *);
  66
  67   if (__regexec ((const regex_t *) expbuf, string, 1, &match, REG_NOTEOL)
  68       == REG_NOMATCH
  69       /* We have to check whether the check is at the beginning of the
  70          buffer.  */
  71       || match.rm_so != 0)
  72     return 0;
  73
  74   loc2 = (char *) string + match.rm_eo;
  75   return 1;
  76 }
  77 weak_alias (__advance, advance)