1/* Header for environment manipulation library.
2   Copyright 1989, 1992, 2000 Free Software Foundation, Inc.
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 2 of the License, or
7   (at your option) any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program; if not, write to the Free Software
16   Foundation, Inc., 59 Temple Place - Suite 330,
17   Boston, MA 02111-1307, USA.  */
18
19#if !defined (ENVIRON_H)
20#define ENVIRON_H 1
21
22/* We manipulate environments represented as these structures.  */
23
24struct environ
25  {
26    /* Number of usable slots allocated in VECTOR.
27       VECTOR always has one slot not counted here,
28       to hold the terminating zero.  */
29    int allocated;
30    /* A vector of slots, ALLOCATED + 1 of them.
31       The first few slots contain strings "VAR=VALUE"
32       and the next one contains zero.
33       Then come some unused slots.  */
34    char **vector;
35  };
36
37extern struct environ *make_environ (void);
38
39extern void free_environ (struct environ *);
40
41extern void init_environ (struct environ *);
42
43extern char *get_in_environ (const struct environ *, const char *);
44
45extern void set_in_environ (struct environ *, const char *, const char *);
46
47extern void unset_in_environ (struct environ *, char *);
48
49extern char **environ_vector (struct environ *);
50
51#endif /* defined (ENVIRON_H) */
52