string/argz-delete.c

   1 /* Routines for dealing with '\0' separated arg vectors.
   2
   3    Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   4
   5    Written by Miles Bader <miles@gnu.ai.mit.edu>
   6
   7    This program is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU General Public License as
   9    published by the Free Software Foundation; either version 2, or (at
  10    your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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       memcpy (entry, entry + entry_len, *argz_len - (entry - *argz));
  35       if (*argz_len == 0)
  36         {
  37           free (*argz);
  38           *argz = 0;
  39         }
  40     }
  41 }