glibc/string/argz-delete.c

/* Routines for dealing with '\0' separated arg vectors.
   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Written by Miles Bader <miles@gnu.ai.mit.edu>

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <argz.h>
#include <string.h>
#include <stdlib.h>

/* Delete ENTRY from ARGZ & ARGZ_LEN, if any.  */
void
argz_delete (char **argz, size_t *argz_len, char *entry)
{
  if (entry)
    /* Get rid of the old value for NAME.  */
    {
      size_t entry_len = strlen (entry) + 1;
      *argz_len -= entry_len;
      memmove (entry, entry + entry_len, *argz_len - (entry - *argz));
      if (*argz_len == 0)
	{
	  free (*argz);
	  *argz = 0;
	}
    }
}