1/*	$NetBSD: var.h,v 1.25 2011/06/18 21:18:46 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kenneth Almquist.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	@(#)var.h	8.2 (Berkeley) 5/4/95
35 */
36
37/*
38 * Shell variables.
39 */
40
41/* flags */
42#define VEXPORT		0x01	/* variable is exported */
43#define VREADONLY	0x02	/* variable cannot be modified */
44#define VSTRFIXED	0x04	/* variable struct is statically allocated */
45#define VTEXTFIXED	0x08	/* text is statically allocated */
46#define VSTACK		0x10	/* text is allocated on the stack */
47#define VUNSET		0x20	/* the variable is not set */
48#define VNOFUNC		0x40	/* don't call the callback function */
49#define VNOSET		0x80	/* do not set variable - just readonly test */
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	int name_len;			/* length of name */
57	void (*func)(const char *);
58					/* function to be called when  */
59					/* the variable gets set/unset */
60};
61
62
63struct localvar {
64	struct localvar *next;		/* next local variable in list */
65	struct var *vp;			/* the variable that was made local */
66	int flags;			/* saved flags */
67	char *text;			/* saved text */
68};
69
70
71extern struct localvar *localvars;
72
73#if ATTY
74extern struct var vatty;
75#endif
76extern struct var vifs;
77extern struct var vmail;
78extern struct var vmpath;
79extern struct var vpath;
80extern struct var vps1;
81extern struct var vps2;
82extern struct var vps4;
83#ifndef SMALL
84extern struct var vterm;
85extern struct var vtermcap;
86extern struct var vhistsize;
87#endif
88
89/*
90 * The following macros access the values of the above variables.
91 * They have to skip over the name.  They return the null string
92 * for unset variables.
93 */
94
95#define ifsval()	(vifs.text + 4)
96#define ifsset()	((vifs.flags & VUNSET) == 0)
97#define mailval()	(vmail.text + 5)
98#define mpathval()	(vmpath.text + 9)
99#define pathval()	(vpath.text + 5)
100#define ps1val()	(vps1.text + 4)
101#define ps2val()	(vps2.text + 4)
102#define ps4val()	(vps4.text + 4)
103#define optindval()	(voptind.text + 7)
104#ifndef SMALL
105#define histsizeval()	(vhistsize.text + 9)
106#define termval()	(vterm.text + 5)
107#endif
108
109#if ATTY
110#define attyset()	((vatty.flags & VUNSET) == 0)
111#endif
112#define mpathset()	((vmpath.flags & VUNSET) == 0)
113
114void initvar(void);
115void setvar(const char *, const char *, int);
116void setvareq(char *, int);
117struct strlist;
118void listsetvar(struct strlist *, int);
119char *lookupvar(const char *);
120char *bltinlookup(const char *, int);
121char **environment(void);
122void shprocvar(void);
123int showvars(const char *, int, int);
124void mklocal(const char *, int);
125void listmklocal(struct strlist *, int);
126void poplocalvars(void);
127int unsetvar(const char *, int);
128int setvarsafe(const char *, const char *, int);
129void print_quoted(const char *);
130