e19206c2 |
1 | /* -*-c-*- |
2 | * |
e19206c2 |
3 | * Fiddling with environment variables |
4 | * |
5 | * (c) 1999 Straylight/Edgeware |
6 | */ |
7 | |
d4efbcd9 |
8 | /*----- Licensing notice --------------------------------------------------* |
e19206c2 |
9 | * |
10 | * This file is part of the mLib utilities library. |
11 | * |
12 | * mLib is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
d4efbcd9 |
16 | * |
e19206c2 |
17 | * mLib is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU Library General Public License for more details. |
d4efbcd9 |
21 | * |
e19206c2 |
22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with mLib; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
c6e0eaf0 |
28 | #ifndef MLIB_ENV_H |
29 | #define MLIB_ENV_H |
e19206c2 |
30 | |
31 | #ifdef __cplusplus |
32 | extern "C" { |
33 | #endif |
34 | |
35 | /*----- Header files ------------------------------------------------------*/ |
36 | |
c6e0eaf0 |
37 | #ifndef MLIB_SYM_H |
e19206c2 |
38 | # include "sym.h" |
39 | #endif |
40 | |
41 | /*----- Functions provided ------------------------------------------------*/ |
42 | |
43 | /* --- @env_get@ --- * |
44 | * |
45 | * Arguments: @sym_table *t@ = pointer to a symbol table |
46 | * @const char *name@ = pointer to variable name to look up |
47 | * |
48 | * Returns: Pointer to corresponding value string, or null. |
49 | * |
50 | * Use: Looks up an environment variable in the table and returns its |
51 | * value. If the variable can't be found, a null pointer is |
52 | * returned. |
53 | */ |
54 | |
55 | extern char *env_get(sym_table */*t*/, const char */*name*/); |
56 | |
57 | /* --- @env_put@ --- * |
58 | * |
59 | * Arguments: @sym_table *t@ = pointer to a symbol table |
60 | * @const char *name@ = pointer to variable name to set |
61 | * @const char *value@ = pointer to value string to assign |
62 | * |
63 | * Returns: --- |
64 | * |
65 | * Use: Assigns a value to a variable. If the @name@ contains an |
66 | * equals character, then it's assumed to be of the form |
67 | * `VAR=VALUE' and @value@ argument is ignored. Otherwise, if |
68 | * @value@ is null, the variable is deleted. Finally, the |
69 | * normal case: @name@ is a plain name, and @value@ is a normal |
70 | * string causes the variable to be assigned the value in the |
71 | * way you'd expect. |
72 | */ |
73 | |
74 | extern void env_put(sym_table */*t*/, |
75 | const char */*name*/, const char */*value*/); |
76 | |
77 | /* --- @env_import@ --- * |
78 | * |
79 | * Arguments: @sym_table *t@ = pointer to a symbol table |
80 | * @char **env@ = pointer to an environment list |
81 | * |
82 | * Returns: --- |
83 | * |
84 | * Use: Inserts all of the environment variables listed into a symbol |
85 | * table for rapid access. Equivalent to a lot of calls to |
86 | * @env_put@. |
87 | */ |
88 | |
89 | extern void env_import(sym_table */*t*/, char **/*env*/); |
90 | |
91 | /* --- @env_export@ --- * |
92 | * |
93 | * Arguments: @sym_table *t@ = pointer to a symbol table |
94 | * |
95 | * Returns: A big environment list. |
96 | * |
97 | * Use: Extracts an environment table from a symbol table |
98 | * representation of an environment. The table and all of the |
99 | * strings are in one big block allocated from the heap. |
100 | */ |
101 | |
102 | extern char **env_export(sym_table */*t*/); |
103 | |
104 | /* --- @env_destroy@ --- * |
105 | * |
106 | * Arguments: @sym_table *t@ = pointer to symbol table |
107 | * |
108 | * Returns: --- |
109 | * |
110 | * Use: Destroys all the variables in the symbol table. |
111 | */ |
112 | |
113 | extern void env_destroy(sym_table */*t*/); |
114 | |
115 | /*----- That's all, folks -------------------------------------------------*/ |
116 | |
117 | #ifdef __cplusplus |
118 | } |
119 | #endif |
120 | |
121 | #endif |