string/argz-next.c

   1 /* Iterate through the elements of an argz block.
   2    Copyright (C) 1995-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Miles Bader <miles@gnu.org>
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the 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    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <argz.h>
  21 #include <string.h>
  22
  23 char *
  24 __argz_next (const 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 (char *) argz;
  36     else
  37       return NULL;
  38 }
  39 libc_hidden_def (__argz_next)
  40 weak_alias (__argz_next, argz_next)
  41 libc_hidden_weak (argz_next)