Update.
[glibc.git] / string / envz.h
blob23aaed61197f9d3ab6344f337189d3f9e0a32dd3
1 /* Routines for dealing with '\0' separated environment vectors
2 Copyright (C) 1995, 1996 Free Software Foundation, Inc.
3 Written by Miles Bader <miles@gnu.ai.mit.edu>
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #ifndef __ENVZ_H__
22 #define __ENVZ_H__ 1
23 #include <features.h>
25 #include <errno.h>
27 /* Envz's are argz's too, and should be created etc., using the same
28 routines. */
29 #include <argz.h>
31 __BEGIN_DECLS
33 /* Returns a pointer to the entry in ENVZ for NAME, or 0 if there is none. */
34 extern char *envz_entry __P ((__const char *__envz, size_t __envz_len,
35 __const char *__name));
37 /* Returns a pointer to the value portion of the entry in ENVZ for NAME, or 0
38 if there is none. */
39 extern char *envz_get __P ((__const char *__envz, size_t __envz_len,
40 __const char *__name));
42 /* Adds an entry for NAME with value VALUE to ENVZ & ENVZ_LEN. If an entry
43 with the same name already exists in ENVZ, it is removed. If VALUE is
44 NULL, then the new entry will a special null one, for which envz_get will
45 return NULL, although envz_entry will still return an entry; this is handy
46 because when merging with another envz, the null entry can override an
47 entry in the other one. Null entries can be removed with envz_strip (). */
48 extern error_t envz_add __P ((char **__envz, size_t *__envz_len,
49 __const char *__name, __const char *__value));
51 /* Adds each entry in ENVZ2 to ENVZ & ENVZ_LEN, as if with envz_add(). If
52 OVERRIDE is true, then values in ENVZ2 will supersede those with the same
53 name in ENV, otherwise not. */
54 extern error_t envz_merge __P ((char **__envz, size_t *__envz_len,
55 __const char *__envz2, size_t __envz2_len,
56 int __override));
58 /* Remove null entries. */
59 extern void envz_strip __P ((char **__envz, size_t *__envz_len));
61 __END_DECLS
63 #endif /* __ENVZ_H__ */