string/argz-next.c

   1 /* Iterate through the elements of an argz block.
   2    Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Miles Bader <miles@gnu.ai.mit.edu>
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <argz.h>
  22 #include <string.h>
  23
  24 char *
  25 __argz_next (char *argz, size_t argz_len, const char *entry)
  26 {
  27   if (entry)
  28     {
  29       if (entry < argz + argz_len)
  30         entry = strchr (entry, '\0') + 1;
  31
  32       return entry >= argz + argz_len ? NULL : (char *) entry;
  33     }
  34   else
  35     if (argz_len > 0)
  36       return argz;
  37     else
  38       return NULL;
  39 }
  40 weak_alias (__argz_next, argz_next)