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/* Header for environment manipulation library.

   Copyright 1989, 1992 Free Software Foundation.

   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 of the License, 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., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#if !defined (ENVIRON_H)

#define ENVIRON_H 1

/* We manipulate environments represented as these structures.  */

struct environ

  {

    /* Number of usable slots allocated in VECTOR.

       VECTOR always has one slot not counted here,

       to hold the terminating zero.  */

    int allocated;

    /* A vector of slots, ALLOCATED + 1 of them.

       The first few slots contain strings "VAR=VALUE"

       and the next one contains zero.

       Then come some unused slots.  */

    char **vector;

  };

extern struct environ *

  make_environ PARAMS ((void));

extern void

free_environ PARAMS ((struct environ *));

extern void

init_environ PARAMS ((struct environ *));

extern char *

  get_in_environ PARAMS ((const struct environ *, const char *));

extern void

set_in_environ PARAMS ((struct environ *, const char *,

                        const char *));

extern void

unset_in_environ PARAMS ((struct environ *, char *));

extern char **

  environ_vector PARAMS ((struct environ *));

#endif /* defined (ENVIRON_H) */