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15637ed4 RG |
1 | /*- |
2 | * Copyright (c) 1991 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Kenneth Almquist. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. All advertising materials mentioning features or use of this software | |
17 | * must display the following acknowledgement: | |
18 | * This product includes software developed by the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
35 | * | |
36 | * @(#)var.h 5.1 (Berkeley) 3/7/91 | |
37 | */ | |
38 | ||
39 | /* | |
40 | * Shell variables. | |
41 | */ | |
42 | ||
43 | /* flags */ | |
44 | #define VEXPORT 01 /* variable is exported */ | |
45 | #define VREADONLY 02 /* variable cannot be modified */ | |
46 | #define VSTRFIXED 04 /* variable struct is staticly allocated */ | |
47 | #define VTEXTFIXED 010 /* text is staticly allocated */ | |
48 | #define VSTACK 020 /* text is allocated on the stack */ | |
49 | #define VUNSET 040 /* the variable is not set */ | |
50 | ||
51 | ||
52 | struct var { | |
53 | struct var *next; /* next entry in hash list */ | |
54 | int flags; /* flags are defined above */ | |
55 | char *text; /* name=value */ | |
56 | }; | |
57 | ||
58 | ||
59 | struct localvar { | |
60 | struct localvar *next; /* next local variable in list */ | |
61 | struct var *vp; /* the variable that was made local */ | |
62 | int flags; /* saved flags */ | |
63 | char *text; /* saved text */ | |
64 | }; | |
65 | ||
66 | ||
67 | struct localvar *localvars; | |
68 | ||
69 | #if ATTY | |
70 | extern struct var vatty; | |
71 | #endif | |
72 | extern struct var vifs; | |
73 | extern struct var vmail; | |
74 | extern struct var vmpath; | |
75 | extern struct var vpath; | |
76 | extern struct var vps1; | |
77 | extern struct var vps2; | |
78 | #if ATTY | |
79 | extern struct var vterm; | |
80 | #endif | |
81 | ||
82 | /* | |
83 | * The following macros access the values of the above variables. | |
84 | * They have to skip over the name. They return the null string | |
85 | * for unset variables. | |
86 | */ | |
87 | ||
88 | #define ifsval() (vifs.text + 4) | |
89 | #define mailval() (vmail.text + 5) | |
90 | #define mpathval() (vmpath.text + 9) | |
91 | #define pathval() (vpath.text + 5) | |
92 | #define ps1val() (vps1.text + 4) | |
93 | #define ps2val() (vps2.text + 4) | |
94 | #if ATTY | |
95 | #define termval() (vterm.text + 5) | |
96 | #endif | |
97 | ||
98 | #if ATTY | |
99 | #define attyset() ((vatty.flags & VUNSET) == 0) | |
100 | #endif | |
101 | #define mpathset() ((vmpath.flags & VUNSET) == 0) | |
102 | ||
103 | ||
104 | #ifdef __STDC__ | |
105 | void initvar(); | |
106 | void setvar(char *, char *, int); | |
107 | void setvareq(char *, int); | |
108 | struct strlist; | |
109 | void listsetvar(struct strlist *); | |
110 | char *lookupvar(char *); | |
111 | char *bltinlookup(char *, int); | |
112 | char **environment(); | |
113 | int showvarscmd(int, char **); | |
114 | void mklocal(char *); | |
115 | void poplocalvars(void); | |
116 | #else | |
117 | void initvar(); | |
118 | void setvar(); | |
119 | void setvareq(); | |
120 | void listsetvar(); | |
121 | char *lookupvar(); | |
122 | char *bltinlookup(); | |
123 | char **environment(); | |
124 | int showvarscmd(); | |
125 | void mklocal(); | |
126 | void poplocalvars(); | |
127 | #endif |