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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 | * %sccs.include.redist.c% | |
9 | * | |
10 | * @(#)var.h 5.1 (Berkeley) %G% | |
11 | */ | |
12 | ||
13 | /* | |
14 | * Shell variables. | |
15 | */ | |
16 | ||
17 | /* flags */ | |
18 | #define VEXPORT 01 /* variable is exported */ | |
19 | #define VREADONLY 02 /* variable cannot be modified */ | |
20 | #define VSTRFIXED 04 /* variable struct is staticly allocated */ | |
21 | #define VTEXTFIXED 010 /* text is staticly allocated */ | |
22 | #define VSTACK 020 /* text is allocated on the stack */ | |
23 | #define VUNSET 040 /* the variable is not set */ | |
24 | ||
25 | ||
26 | struct var { | |
27 | struct var *next; /* next entry in hash list */ | |
28 | int flags; /* flags are defined above */ | |
29 | char *text; /* name=value */ | |
30 | }; | |
31 | ||
32 | ||
33 | struct localvar { | |
34 | struct localvar *next; /* next local variable in list */ | |
35 | struct var *vp; /* the variable that was made local */ | |
36 | int flags; /* saved flags */ | |
37 | char *text; /* saved text */ | |
38 | }; | |
39 | ||
40 | ||
41 | struct localvar *localvars; | |
42 | ||
43 | #if ATTY | |
44 | extern struct var vatty; | |
45 | #endif | |
46 | extern struct var vifs; | |
47 | extern struct var vmail; | |
48 | extern struct var vmpath; | |
49 | extern struct var vpath; | |
50 | extern struct var vps1; | |
51 | extern struct var vps2; | |
52 | #if ATTY | |
53 | extern struct var vterm; | |
54 | #endif | |
55 | ||
56 | /* | |
57 | * The following macros access the values of the above variables. | |
58 | * They have to skip over the name. They return the null string | |
59 | * for unset variables. | |
60 | */ | |
61 | ||
62 | #define ifsval() (vifs.text + 4) | |
63 | #define mailval() (vmail.text + 5) | |
64 | #define mpathval() (vmpath.text + 9) | |
65 | #define pathval() (vpath.text + 5) | |
66 | #define ps1val() (vps1.text + 4) | |
67 | #define ps2val() (vps2.text + 4) | |
68 | #if ATTY | |
69 | #define termval() (vterm.text + 5) | |
70 | #endif | |
71 | ||
72 | #if ATTY | |
73 | #define attyset() ((vatty.flags & VUNSET) == 0) | |
74 | #endif | |
75 | #define mpathset() ((vmpath.flags & VUNSET) == 0) | |
76 | ||
77 | ||
78 | #ifdef __STDC__ | |
79 | void initvar(); | |
80 | void setvar(char *, char *, int); | |
81 | void setvareq(char *, int); | |
82 | struct strlist; | |
83 | void listsetvar(struct strlist *); | |
84 | char *lookupvar(char *); | |
85 | char *bltinlookup(char *, int); | |
86 | char **environment(); | |
87 | int showvarscmd(int, char **); | |
88 | void mklocal(char *); | |
89 | void poplocalvars(void); | |
90 | #else | |
91 | void initvar(); | |
92 | void setvar(); | |
93 | void setvareq(); | |
94 | void listsetvar(); | |
95 | char *lookupvar(); | |
96 | char *bltinlookup(); | |
97 | char **environment(); | |
98 | int showvarscmd(); | |
99 | void mklocal(); | |
100 | void poplocalvars(); | |
101 | #endif |