string/argz-delete.c

   1 /* Routines for dealing with '\0' separated arg vectors.
   2    Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Miles Bader <miles@gnu.ai.mit.edu>
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <argz.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24
  25 /* Delete ENTRY from ARGZ & ARGZ_LEN, if any.  */
  26 void
  27 argz_delete (char **argz, size_t *argz_len, char *entry)
  28 {
  29   if (entry)
  30     /* Get rid of the old value for NAME.  */
  31     {
  32       size_t entry_len = strlen (entry) + 1;
  33       *argz_len -= entry_len;
  34       memmove (entry, entry + entry_len, *argz_len - (entry - *argz));
  35       if (*argz_len == 0)
  36         {
  37           free (*argz);
  38           *argz = 0;
  39         }
  40     }
  41 }