1  /* Copyright (C) 1995-2023 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  }