glibc/wcsmbs/wcsspn.c

/* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.	 If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, 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;
}