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01: /* Routines for dealing with '\0' separated environment vectors
02:    Copyright (C) 1995, 96, 98, 99, 2000 Free Software Foundation, Inc.
03:    This file is part of the GNU C Library.
04: 
05:    The GNU C Library is free software; you can redistribute it and/or
06:    modify it under the terms of the GNU Lesser General Public
07:    License as published by the Free Software Foundation; either
08:    version 2.1 of the License, or (at your option) any later version.
09: 
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:    Lesser General Public License for more details.
14: 
15:    You should have received a copy of the GNU Lesser General Public
16:    License along with the GNU C Library; if not, write to the Free
17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18:    02111-1307 USA.  */
19: 
20: #ifndef _ENVZ_H
21: #define _ENVZ_H 1
22: 
23: #include <features.h>
24: 
25: #include <errno.h>
26: 
27: /* Envz's are argz's too, and should be created etc., using the same
28:    routines.  */
29: #include <argz.h>
30: 
31: __BEGIN_DECLS
32: 
33: /* Returns a pointer to the entry in ENVZ for NAME, or 0 if there is none.  */
34: extern char *envz_entry (__const char *__restrict __envz, size_t __envz_len,
35:                          __const char *__restrict __name)
36:      __THROW __attribute_pure__;
37: 
38: /* Returns a pointer to the value portion of the entry in ENVZ for NAME, or 0
39:    if there is none.  */
40: extern char *envz_get (__const char *__restrict __envz, size_t __envz_len,
41:                        __const char *__restrict __name)
42:      __THROW __attribute_pure__;
43: 
44: /* Adds an entry for NAME with value VALUE to ENVZ & ENVZ_LEN.  If an entry
45:    with the same name already exists in ENVZ, it is removed.  If VALUE is
46:    NULL, then the new entry will a special null one, for which envz_get will
47:    return NULL, although envz_entry will still return an entry; this is handy
48:    because when merging with another envz, the null entry can override an
49:    entry in the other one.  Null entries can be removed with envz_strip ().  */
50: extern error_t envz_add (char **__restrict __envz,
51:                          size_t *__restrict __envz_len,
52:                          __const char *__restrict __name,
53:                          __const char *__restrict __value) __THROW;
54: 
55: /* Adds each entry in ENVZ2 to ENVZ & ENVZ_LEN, as if with envz_add().  If
56:    OVERRIDE is true, then values in ENVZ2 will supersede those with the same
57:    name in ENV, otherwise not.  */
58: extern error_t envz_merge (char **__restrict __envz,
59:                            size_t *__restrict __envz_len,
60:                            __const char *__restrict __envz2,
61:                            size_t __envz2_len, int __override) __THROW;
62: 
63: /* Remove the entry for NAME from ENVZ & ENVZ_LEN, if any.  */
64: extern void envz_remove (char **__restrict __envz,
65:                          size_t *__restrict __envz_len,
66:                          __const char *__restrict __name) __THROW;
67: 
68: /* Remove null entries.  */
69: extern void envz_strip (char **__restrict __envz,
70:                         size_t *__restrict __envz_len) __THROW;
71: 
72: __END_DECLS
73: 
74: #endif /* envz.h */
75: 

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