wcsmbs/wcscspn.c

   1 /* Copyright (C) 1995-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <wchar.h>
  19
  20 #ifdef WCSCSPN
  21 # define wcscspn WCSCSPN
  22 #endif
  23
  24 /* Return the length of the maximum initial segment
  25    of WCS which contains only wide-characters not in REJECT.  */
  26 size_t
  27 wcscspn (const wchar_t *wcs, const wchar_t *reject)
  28 {
  29   size_t count = 0;
  30
  31   while (*wcs != L'\0')
  32     if (wcschr (reject, *wcs++) == NULL)
  33       ++count;
  34     else
  35       return count;
  36
  37   return count;
  38 }