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
50struct var {
51 struct var *next; /* next entry in hash list */
52 int flags; /* flags are defined above */
53 int name_len; /* length of name */
54 char *text; /* name=value */
55 void (*func)(const char *);
56 /* function to be called when */
57 /* the variable gets set/unset */
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
67extern struct localvar *localvars;
68extern int forcelocal;
69
70extern struct var vifs;
71extern struct var vmail;
72extern struct var vmpath;
73extern struct var vpath;
74extern struct var vps1;
75extern struct var vps2;
76extern struct var vps4;
77extern struct var vdisvfork;
78#ifndef NO_HISTORY
79extern struct var vhistsize;
80extern struct var vterm;
81#endif
82
83extern int localeisutf8;
84/* The parser uses the locale that was in effect at startup. */
85extern int initial_localeisutf8;
86
87/*
88 * The following macros access the values of the above variables.
89 * They have to skip over the name. They return the null string
90 * for unset variables.
91 */
92
93#define ifsval() (vifs.text + 4)
94#define ifsset() ((vifs.flags & VUNSET) == 0)
95#define mailval() (vmail.text + 5)
96#define mpathval() (vmpath.text + 9)
97#define pathval() (vpath.text + 5)
98#define ps1val() (vps1.text + 4)
99#define ps2val() (vps2.text + 4)
100#define ps4val() (vps4.text + 4)
101#define optindval() (voptind.text + 7)
102#ifndef NO_HISTORY
103#define histsizeval() (vhistsize.text + 9)
104#define termval() (vterm.text + 5)
105#endif
106
107#define mpathset() ((vmpath.flags & VUNSET) == 0)
108#define disvforkset() ((vdisvfork.flags & VUNSET) == 0)
109
110void initvar(void);
111void setvar(const char *, const char *, int);
112void setvareq(char *, int);
113struct arglist;
114void listsetvar(struct arglist *, int);
115char *lookupvar(const char *);
116char *bltinlookup(const char *, int);
117void bltinsetlocale(void);
118void bltinunsetlocale(void);
119void updatecharset(void);
120void initcharset(void);
121char **environment(void);
122int showvarscmd(int, char **);
123void mklocal(char *);
124void poplocalvars(void);
125int unsetvar(const char *);
126int setvarsafe(const char *, const char *, int);
