1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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
35/*
36 * Shell variables.
37 */
38
39/* flags */
40#define VEXPORT		0x01	/* variable is exported */
41#define VREADONLY	0x02	/* variable cannot be modified */
42#define VSTRFIXED	0x04	/* variable struct is statically allocated */
43#define VTEXTFIXED	0x08	/* text is statically allocated */
44#define VSTACK		0x10	/* text is allocated on the stack */
45#define VUNSET		0x20	/* the variable is not set */
46#define VNOFUNC		0x40	/* don't call the callback function */
47#define VNOSET		0x80	/* do not set variable - just readonly test */
48#define VNOLOCAL	0x100	/* ignore forcelocal */
49
50
51struct var {
52	struct var *next;		/* next entry in hash list */
53	int flags;			/* flags are defined above */
54	int name_len;			/* length of name */
55	char *text;			/* name=value */
56	void (*func)(const char *);
57					/* function to be called when  */
58					/* the variable gets set/unset */
59};
60
61
62struct localvar {
63	struct localvar *next;		/* next local variable in list */
64	struct var *vp;			/* the variable that was made local */
65	int flags;			/* saved flags */
66	char *text;			/* saved text */
67};
68
69
70extern struct localvar *localvars;
71extern int forcelocal;
72
73extern struct var vifs;
74extern struct var vmail;
75extern struct var vmpath;
76extern struct var vpath;
77extern struct var vps1;
78extern struct var vps2;
79extern struct var vps4;
80extern struct var vdisvfork;
81#ifndef NO_HISTORY
82extern struct var vhistsize;
83extern struct var vterm;
84#endif
85
86extern int localeisutf8;
87/* The parser uses the locale that was in effect at startup. */
88extern int initial_localeisutf8;
89
90/*
91 * The following macros access the values of the above variables.
92 * They have to skip over the name.  They return the null string
93 * for unset variables.
94 */
95
96#define ifsval()	(vifs.text + 4)
97#define ifsset()	((vifs.flags & VUNSET) == 0)
98#define mailval()	(vmail.text + 5)
99#define mpathval()	(vmpath.text + 9)
100#define pathval()	(vpath.text + 5)
101#define ps1val()	(vps1.text + 4)
102#define ps2val()	(vps2.text + 4)
103#define ps4val()	(vps4.text + 4)
104#define optindval()	(voptind.text + 7)
105#ifndef NO_HISTORY
106#define histsizeval()	(vhistsize.text + 9)
107#define termval()	(vterm.text + 5)
108#endif
109
110#define mpathset()	((vmpath.flags & VUNSET) == 0)
111#define disvforkset()	((vdisvfork.flags & VUNSET) == 0)
112
113void initvar(void);
114void setvar(const char *, const char *, int);
115void setvareq(char *, int);
116struct arglist;
117void listsetvar(struct arglist *, int);
118char *lookupvar(const char *);
119char *bltinlookup(const char *, int);
120void bltinsetlocale(void);
121void bltinunsetlocale(void);
122void updatecharset(void);
123void initcharset(void);
124char **environment(void);
125int showvarscmd(int, char **);
126void mklocal(char *);
127void poplocalvars(void);
128int unsetvar(const char *);
129int setvarsafe(const char *, const char *, int);
130