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