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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: env.h,v 1.2 1999/12/10 23:42:04 mdw Exp $ |
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4 | * |
5 | * Fiddling with environment variables |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the mLib utilities library. |
13 | * |
14 | * mLib is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * mLib is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with mLib; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: env.h,v $ |
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33 | * Revision 1.2 1999/12/10 23:42:04 mdw |
34 | * Change header file guard names. |
35 | * |
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36 | * Revision 1.1 1999/07/26 23:15:57 mdw |
37 | * Fiddling with environment variables. |
38 | * |
39 | */ |
40 | |
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41 | #ifndef MLIB_ENV_H |
42 | #define MLIB_ENV_H |
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43 | |
44 | #ifdef __cplusplus |
45 | extern "C" { |
46 | #endif |
47 | |
48 | /*----- Header files ------------------------------------------------------*/ |
49 | |
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50 | #ifndef MLIB_SYM_H |
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51 | # include "sym.h" |
52 | #endif |
53 | |
54 | /*----- Functions provided ------------------------------------------------*/ |
55 | |
56 | /* --- @env_get@ --- * |
57 | * |
58 | * Arguments: @sym_table *t@ = pointer to a symbol table |
59 | * @const char *name@ = pointer to variable name to look up |
60 | * |
61 | * Returns: Pointer to corresponding value string, or null. |
62 | * |
63 | * Use: Looks up an environment variable in the table and returns its |
64 | * value. If the variable can't be found, a null pointer is |
65 | * returned. |
66 | */ |
67 | |
68 | extern char *env_get(sym_table */*t*/, const char */*name*/); |
69 | |
70 | /* --- @env_put@ --- * |
71 | * |
72 | * Arguments: @sym_table *t@ = pointer to a symbol table |
73 | * @const char *name@ = pointer to variable name to set |
74 | * @const char *value@ = pointer to value string to assign |
75 | * |
76 | * Returns: --- |
77 | * |
78 | * Use: Assigns a value to a variable. If the @name@ contains an |
79 | * equals character, then it's assumed to be of the form |
80 | * `VAR=VALUE' and @value@ argument is ignored. Otherwise, if |
81 | * @value@ is null, the variable is deleted. Finally, the |
82 | * normal case: @name@ is a plain name, and @value@ is a normal |
83 | * string causes the variable to be assigned the value in the |
84 | * way you'd expect. |
85 | */ |
86 | |
87 | extern void env_put(sym_table */*t*/, |
88 | const char */*name*/, const char */*value*/); |
89 | |
90 | /* --- @env_import@ --- * |
91 | * |
92 | * Arguments: @sym_table *t@ = pointer to a symbol table |
93 | * @char **env@ = pointer to an environment list |
94 | * |
95 | * Returns: --- |
96 | * |
97 | * Use: Inserts all of the environment variables listed into a symbol |
98 | * table for rapid access. Equivalent to a lot of calls to |
99 | * @env_put@. |
100 | */ |
101 | |
102 | extern void env_import(sym_table */*t*/, char **/*env*/); |
103 | |
104 | /* --- @env_export@ --- * |
105 | * |
106 | * Arguments: @sym_table *t@ = pointer to a symbol table |
107 | * |
108 | * Returns: A big environment list. |
109 | * |
110 | * Use: Extracts an environment table from a symbol table |
111 | * representation of an environment. The table and all of the |
112 | * strings are in one big block allocated from the heap. |
113 | */ |
114 | |
115 | extern char **env_export(sym_table */*t*/); |
116 | |
117 | /* --- @env_destroy@ --- * |
118 | * |
119 | * Arguments: @sym_table *t@ = pointer to symbol table |
120 | * |
121 | * Returns: --- |
122 | * |
123 | * Use: Destroys all the variables in the symbol table. |
124 | */ |
125 | |
126 | extern void env_destroy(sym_table */*t*/); |
127 | |
128 | /*----- That's all, folks -------------------------------------------------*/ |
129 | |
130 | #ifdef __cplusplus |
131 | } |
132 | #endif |
133 | |
134 | #endif |