* lib/strspn.c: New.

[bison.git] / lib / strspn.c

/* Copyright (C) 1991, 1997 Free Software Foundation, Inc.

   NOTE: The canonical source of this file is maintained with the GNU
   C Library.  Bugs can be reported to bug-glibc@prep.ai.mit.edu.

   This program 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.

   This program 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 this program; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place -
   Suite 330, Boston, MA 02111-1307, USA.  */

#if HAVE_CONFIG_H
# include <config.h>
#endif

#if defined _LIBC || HAVE_STRING_H
# include <string.h>
#else
# include <strings.h>
# ifndef strchr
#  define strchr index
# endif
#endif

#undef strspn

/* Return the length of the maximum initial segment
   of S which contains only characters in ACCEPT.  */
size_t
strspn (s, accept)
     const char *s;
     const char *accept;
{
  const char *p;
  const char *a;
  size_t count = 0;

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

  return count;
}