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The Android Open Source Projectdd7bc332009-03-03 19:32:55 -08001/* $NetBSD: var.h,v 1.23 2004/10/02 12:16:53 dsl 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
71struct localvar *localvars;
72
73#if ATTY
74extern struct var vatty;
75#endif
76extern struct var vifs;
77extern struct var vmpath;
78extern struct var vpath;
79extern struct var vps1;
80extern struct var vps2;
81extern struct var vps4;
82#ifdef WITH_HISTORY
83extern struct var vterm;
84extern struct var vtermcap;
85extern struct var vhistsize;
86#endif
87
88/*
89 * The following macros access the values of the above variables.
90 * They have to skip over the name. They return the null string
91 * for unset variables.
92 */
93
94#define ifsval() (vifs.text + 4)
95#define ifsset() ((vifs.flags & VUNSET) == 0)
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#ifdef WITH_HISTORY
103#define histsizeval() (vhistsize.text + 9)
104#define termval() (vterm.text + 5)
105#endif
106
107#if ATTY
108#define attyset() ((vatty.flags & VUNSET) == 0)
109#endif
110#define mpathset() ((vmpath.flags & VUNSET) == 0)
111
112void initvar(void);
113void setvar(const char *, const char *, int);
114void setvareq(char *, int);
115struct strlist;
116void listsetvar(struct strlist *, int);
117char *lookupvar(const char *);
118char *bltinlookup(const char *, int);
119char **environment(void);
120void shprocvar(void);
121int showvars(const char *, int, int);
122int exportcmd(int, char **);
123int localcmd(int, char **);
124void mklocal(const char *, int);
125void listmklocal(struct strlist *, int);
126void poplocalvars(void);
127int setvarcmd(int, char **);
128int unsetcmd(int, char **);
129int unsetvar(const char *, int);
130int setvarsafe(const char *, const char *, int);
131void print_quoted(const char *);