lib/strspn.c

   1 /* strspn.c -- return numbers of chars at start of string in a class
   2    Copyright (C) 1987, 1990, 2004 Free Software Foundation, Inc.
   3
   4    This file is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17    Boston, MA 02110-1301, USA.
  18 */
  19
  20 #include <config.h>
  21
  22
  23 #if defined HAVE_STRING_H
  24 #include <string.h>
  25 #else
  26 #include <strings.h>
  27 #ifndef strchr
  28 #define strchr index
  29 #endif
  30 #endif
  31
  32 #if !defined(HAVE_STRSPN)
  33 int
  34 strspn (str, class)
  35      char *str, *class;
  36 {
  37   register char *st = str;
  38
  39   while (*st && strchr (class, *st))
  40     ++st;
  41   return st - str;
  42 }
  43 #endif