wcsmbs/wcsspn.c


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/* Copyright (C) 1995, 1996, 1997 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <wchar.h>


/* Return the length of the maximum initial segment
   of WCS which contains only wide-characters in ACCEPT.  */
size_t
wcsspn (wcs, accept)
     const wchar_t *wcs;
     const wchar_t *accept;
{
  register const wchar_t *p;
  register const wchar_t *a;
  register size_t count = 0;

  for (p = wcs; *p != L'\0'; ++p)
    {
      for (a = accept; *a != L'\0'; ++a)
	if (*p == *a)
	  break;
      if (*a == L'\0')
	return count;
      else
	++count;
    }

  return count;
}