glibc/wcsmbs/wcscspn.c

/* Copyright (C) 1995-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <wchar.h>

#ifdef WCSCSPN
# define wcscspn WCSCSPN
#endif

/* Return the length of the maximum initial segment
   of WCS which contains only wide-characters not in REJECT.  */
size_t
wcscspn (const wchar_t *wcs, const wchar_t *reject)
{
  size_t count = 0;

  while (*wcs != L'\0')
    if (wcschr (reject, *wcs++) == NULL)
      ++count;
    else
      return count;

  return count;
}