/* Routines for dealing with '\0' separated environment vectors

   Copyright (C) 1995, 1996 Free Software Foundation, Inc.

   Written by Miles Bader <miles@gnu.ai.mit.edu>

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

   This program 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
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#ifndef __ENVZ_H__
#define __ENVZ_H__

#include <errno.h>

/* Envz's are argz's too, and should be created etc., using the same
   routines.  */
#include <argz.h>

/* Returns a pointer to the entry in ENVZ for NAME, or 0 if there is none.  */
char *envz_entry (const char *envz, size_t envz_len, const char *name);

/* Returns a pointer to the value portion of the entry in ENVZ for NAME, or 0
   if there is none.  */
char *envz_get (const char *envz, size_t envz_len, const char *name);

/* Adds an entry for NAME with value VALUE to ENVZ & ENVZ_LEN.  If an entry
   with the same name already exists in ENVZ, it is removed.  If VALUE is
   NULL, then the new entry will a special null one, for which envz_get will
   return NULL, although envz_entry will still return an entry; this is handy
   because when merging with another envz, the null entry can override an
   entry in the other one.  Null entries can be removed with envz_strip ().  */
error_t envz_add (char **envz, size_t *envz_len,
		  const char *name, const char *value);

/* Adds each entry in ENVZ2 to ENVZ & ENVZ_LEN, as if with envz_add().  If
   OVERRIDE is true, then values in ENVZ2 will supercede those with the same
   name in ENV, otherwise not.  */
error_t envz_merge (char **envz, size_t *envz_len,
		    const char *envz2, size_t envz2_len,
		    int override);

/* Remove null entries.  */
void envz_strip (char **envz, size_t *envz_len);

#endif /* __ENVZ_H__ */