wcsmbs/wcsspn.c

   1 /* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3 Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 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 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <wchar.h>
  21
  22
  23 /* Return the length of the maximum initial segment
  24    of WCS which contains only wide-characters in ACCEPT.  */
  25 size_t
  26 wcsspn (wcs, accept)
  27      const wchar_t *wcs;
  28      const wchar_t *accept;
  29 {
  30   register const wchar_t *p;
  31   register const wchar_t *a;
  32   register size_t count = 0;
  33
  34   for (p = wcs; *p != L'\0'; ++p)
  35     {
  36       for (a = accept; *a != L'\0'; ++a)
  37         if (*p == *a)
  38           break;
  39       if (*a == L'\0')
  40         return count;
  41       else
  42         ++count;
  43     }
  44
  45   return count;
  46 }