wcsmbs/wcsspn.c

   1 /* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <wchar.h>
  20
  21
  22 /* Return the length of the maximum initial segment
  23    of WCS which contains only wide-characters in ACCEPT.  */
  24 size_t
  25 wcsspn (wcs, accept)
  26      const wchar_t *wcs;
  27      const wchar_t *accept;
  28 {
  29   register const wchar_t *p;
  30   register const wchar_t *a;
  31   register size_t count = 0;
  32
  33   for (p = wcs; *p != L'\0'; ++p)
  34     {
  35       for (a = accept; *a != L'\0'; ++a)
  36         if (*p == *a)
  37           break;
  38       if (*a == L'\0')
  39         return count;
  40       else
  41         ++count;
  42     }
  43
  44   return count;
  45 }
  46 libc_hidden_def (wcsspn)