string/argz-next.c

   1 /* Iterate through the elements of an argz block.
   2    Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   3
   4    Written by Miles Bader <miles@gnu.ai.mit.edu>
   5
   6    This program is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU General Public License as
   8    published by the Free Software Foundation; either version 2, or (at
   9    your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful, but
  12    WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
  19
  20 #include <argz.h>
  21 #include <string.h>
  22
  23 char *
  24 __argz_next (char *argz, size_t argz_len, const char *entry)
  25 {
  26   if (entry)
  27     {
  28       if (entry < argz + argz_len)
  29         entry = strchr (entry, '\0') + 1;
  30
  31       return entry >= argz + argz_len ? NULL : (char *) entry;
  32     }
  33   else
  34     if (argz_len > 0)
  35       return argz;
  36     else
  37       return NULL;
  38 }
  39 weak_alias (__argz_next, argz_next)