source: trunk/minix/commands/ash/var.h@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 3.9 KB
Line 
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
52struct 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
59struct 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
67struct localvar *localvars;
68
69#if ATTY
70extern struct var vatty;
71#endif
72extern struct var vifs;
73extern struct var vmail;
74extern struct var vmpath;
75extern struct var vpath;
76extern struct var vps1;
77extern struct var vps2;
78extern struct var vpse;
79#if ATTY
80extern struct var vterm;
81#endif
82
83/*
84 * The following macros access the values of the above variables.
85 * They have to skip over the name. They return the null string
86 * for unset variables.
87 */
88
89#define ifsval() (vifs.text + 4)
90#define mailval() (vmail.text + 5)
91#define mpathval() (vmpath.text + 9)
92#define pathval() (vpath.text + 5)
93#define ps1val() (vps1.text + 4)
94#define ps2val() (vps2.text + 4)
95#define pseval() (vpse.text + 4)
96#if ATTY
97#define termval() (vterm.text + 5)
98#endif
99
100#if ATTY
101#define attyset() ((vatty.flags & VUNSET) == 0)
102#endif
103#define mpathset() ((vmpath.flags & VUNSET) == 0)
104
105
106#ifdef __STDC__
107void initvar();
108void setvar(char *, char *, int);
109void setvareq(char *, int);
110struct strlist;
111void listsetvar(struct strlist *);
112char *lookupvar(char *);
113char *bltinlookup(char *, int);
114char **environment();
115int showvarscmd(int, char **);
116void mklocal(char *);
117void poplocalvars(void);
118#else
119void initvar();
120void setvar();
121void setvareq();
122void listsetvar();
123char *lookupvar();
124char *bltinlookup();
125char **environment();
126int showvarscmd();
127void mklocal();
128void poplocalvars();
129#endif
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