lib/strsep.c

   1 /*
   2  * $Id: strsep.c,v 1.1 2006/07/02 19:27:17 serassio Exp $
   3  */
   4
   5 /* Copyright (C) 2004 Free Software Foundation, Inc.
   6  * Written by Yoann Vandoorselaere <yoann@prelude-ids.org>
   7  *
   8  * The file is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This file is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this file; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21  * USA.
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 /* Specification.  */
  29 #include "strsep.h"
  30
  31 #include <string.h>
  32
  33 char *
  34 strsep (char **stringp, const char *delim)
  35 {
  36   char *start = *stringp;
  37   char *ptr;
  38
  39   if (!start)
  40     return NULL;
  41
  42   if (!*delim)
  43     ptr = start + strlen (start);
  44   else
  45     {
  46       ptr = strpbrk (start, delim);
  47       if (!ptr)
  48         {
  49           *stringp = NULL;
  50           return start;
  51         }
  52     }
  53
  54   *ptr = '\0';
  55   *stringp = ptr + 1;
  56
  57   return start;
  58 }