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strsep.c

/* Copyright (C) 2004, 2007, 2009, 2010 Free Software Foundation, Inc.

   Written by Yoann Vandoorselaere <yoann@prelude-ids.org>.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

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

/* Specification.  */
#include <string.h>

char *
strsep (char **stringp, const char *delim)
{
  char *start = *stringp;
  char *ptr;

  if (start == NULL)
    return NULL;

  /* Optimize the case of no delimiters.  */
  if (delim[0] == '\0')
    {
      *stringp = NULL;
      return start;
    }

  /* Optimize the case of one delimiter.  */
  if (delim[1] == '\0')
    ptr = strchr (start, delim[0]);
  else
    /* The general case.  */
    ptr = strpbrk (start, delim);
  if (ptr == NULL)
    {
      *stringp = NULL;
      return start;
    }

  *ptr = '\0';
  *stringp = ptr + 1;

  return start;
}

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