var.h revision 17987 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  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	8.2 (Berkeley) 5/4/95
37 *	$Id: var.h,v 1.2 1994/09/24 02:58:23 davidg Exp $
38 */
39
40/*
41 * Shell variables.
42 */
43
44/* flags */
45#define VEXPORT		01	/* variable is exported */
46#define VREADONLY	02	/* variable cannot be modified */
47#define VSTRFIXED	04	/* variable struct is staticly allocated */
48#define VTEXTFIXED	010	/* text is staticly allocated */
49#define VSTACK		020	/* text is allocated on the stack */
50#define VUNSET		040	/* the variable is not set */
51
52
53struct var {
54	struct var *next;		/* next entry in hash list */
55	int flags;		/* flags are defined above */
56	char *text;		/* name=value */
57};
58
59
60struct localvar {
61	struct localvar *next;	/* next local variable in list */
62	struct var *vp;		/* the variable that was made local */
63	int flags;		/* saved flags */
64	char *text;		/* saved text */
65};
66
67
68struct localvar *localvars;
69
70#if ATTY
71extern struct var vatty;
72#endif
73extern struct var vifs;
74extern struct var vmail;
75extern struct var vmpath;
76extern struct var vpath;
77extern struct var vps1;
78extern struct var vps2;
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#if ATTY
96#define termval()	(vterm.text + 5)
97#endif
98
99#if ATTY
100#define attyset()	((vatty.flags & VUNSET) == 0)
101#endif
102#define mpathset()	((vmpath.flags & VUNSET) == 0)
103
104void initvar __P((void));
105void setvar __P((char *, char *, int));
106void setvareq __P((char *, int));
107struct strlist;
108void listsetvar __P((struct strlist *));
109char *lookupvar __P((char *));
110char *bltinlookup __P((char *, int));
111char **environment __P((void));
112void shprocvar __P((void));
113int showvarscmd __P((int, char **));
114int exportcmd __P((int, char **));
115int localcmd __P((int, char **));
116void mklocal __P((char *));
117void poplocalvars __P((void));
118int setvarcmd __P((int, char **));
119int unsetcmd __P((int, char **));
120