string/argz-delete.c

   1 /* Routines for dealing with '\0' separated arg vectors.
   2    Copyright (C) 1995-2021 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 #include <stdlib.h>
  22
  23 /* Delete ENTRY from ARGZ & ARGZ_LEN, if any.  */
  24 void
  25 argz_delete (char **argz, size_t *argz_len, char *entry)
  26 {
  27   if (entry)
  28     /* Get rid of the old value for NAME.  */
  29     {
  30       size_t entry_len = strlen (entry) + 1;
  31       *argz_len -= entry_len;
  32       memmove (entry, entry + entry_len, *argz_len - (entry - *argz));
  33       if (*argz_len == 0)
  34         {
  35           free (*argz);
  36           *argz = 0;
  37         }
  38     }
  39 }
  40 libc_hidden_def (argz_delete)