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);
