string/argz-delete.c

   1 /* Routines for dealing with '\0' separated arg vectors.
   2    Copyright (C) 1995-2017 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    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <argz.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23
  24 /* Delete ENTRY from ARGZ & ARGZ_LEN, if any.  */
  25 void
  26 argz_delete (char **argz, size_t *argz_len, char *entry)
  27 {
  28   if (entry)
  29     /* Get rid of the old value for NAME.  */
  30     {
  31       size_t entry_len = strlen (entry) + 1;
  32       *argz_len -= entry_len;
  33       memmove (entry, entry + entry_len, *argz_len - (entry - *argz));
  34       if (*argz_len == 0)
  35         {
  36           free (*argz);
  37           *argz = 0;
  38         }
  39     }
  40 }
  41 libc_hidden_def (argz_delete)