string/argz-next.c

   1 /* Iterate through the elements of an argz block.
   2    Copyright (C) 1995-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <argz.h>
  20 #include <string.h>
  21
  22 char *
  23 __argz_next (const char *argz, size_t argz_len, const char *entry)
  24 {
  25   if (entry)
  26     {
  27       if (entry < argz + argz_len)
  28         entry = strchr (entry, '\0') + 1;
  29
  30       return entry >= argz + argz_len ? NULL : (char *) entry;
  31     }
  32   else
  33     if (argz_len > 0)
  34       return (char *) argz;
  35     else
  36       return NULL;
  37 }
  38 libc_hidden_def (__argz_next)
  39 weak_alias (__argz_next, argz_next)
  40 libc_hidden_weak (argz_next)