wcsmbs/wcsspn.c

   1 /* Copyright (C) 1995-2019 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 #ifdef WCSSPN
  22 # define wcsspn WCSSPN
  23 #endif
  24
  25 /* Return the length of the maximum initial segment
  26    of WCS which contains only wide-characters in ACCEPT.  */
  27 size_t
  28 wcsspn (const wchar_t *wcs, const wchar_t *accept)
  29 {
  30   const wchar_t *p;
  31   const wchar_t *a;
  32   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 }
  47 libc_hidden_def (wcsspn)