sysdeps/generic/strsep.c

   1 /* Copyright (C) 1992, 1993, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library 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 GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <string.h>
  20
  21 char *
  22 strsep (char **stringp, const char *delim)
  23 {
  24   char *begin, *end;
  25
  26   begin = *stringp;
  27   if (! begin || *begin == '\0')
  28     return NULL;
  29
  30   /* Find the end of the token.  */
  31   end = strpbrk (begin, delim);
  32   if (end)
  33     {
  34       /* Terminate the token and advance *STRINGP past the delimiters.  */
  35       *end++ = '\0';
  36       *stringp = end + strspn (end, delim);
  37     }
  38   else
  39     /* No more delimiters; this is the last token.  */
  40     *stringp = NULL;
  41
  42   return begin;
  43 }