var.h revision 1556 
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	8.1 (Berkeley) 5/31/93
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;
78#if ATTY
79extern 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__
105void initvar();
106void setvar(char *, char *, int);
107void setvareq(char *, int);
108struct strlist;
109void listsetvar(struct strlist *);
110char *lookupvar(char *);
111char *bltinlookup(char *, int);
112char **environment();
113int showvarscmd(int, char **);
114void mklocal(char *);
115void poplocalvars(void);
116#else
117void initvar();
118void setvar();
119void setvareq();
120void listsetvar();
121char *lookupvar();
122char *bltinlookup();
123char **environment();
124int showvarscmd();
125void mklocal();
126void poplocalvars();
127#endif
128