sh: Save/restore changed variables in optimized command substitution.
[dragonfly.git] / bin / sh / var.h
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1/*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)var.h 8.2 (Berkeley) 5/4/95
32931063 37 * $FreeBSD: src/bin/sh/var.h,v 1.23 2011/06/12 23:06:04 jilles Exp $
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38 */
39
40/*
41 * Shell variables.
42 */
43
44/* flags */
45#define VEXPORT 0x01 /* variable is exported */
46#define VREADONLY 0x02 /* variable cannot be modified */
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47#define VSTRFIXED 0x04 /* variable struct is statically allocated */
48#define VTEXTFIXED 0x08 /* text is statically allocated */
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49#define VSTACK 0x10 /* text is allocated on the stack */
50#define VUNSET 0x20 /* the variable is not set */
51#define VNOFUNC 0x40 /* don't call the callback function */
99512ac4 52#define VNOSET 0x80 /* do not set variable - just readonly test */
32931063 53#define VNOLOCAL 0x100 /* ignore forcelocal */
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54
55
56struct var {
57 struct var *next; /* next entry in hash list */
58 int flags; /* flags are defined above */
7ea41a21 59 int name_len; /* length of name */
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60 char *text; /* name=value */
61 void (*func)(const char *);
62 /* function to be called when */
63 /* the variable gets set/unset */
64};
65
66
67struct localvar {
68 struct localvar *next; /* next local variable in list */
69 struct var *vp; /* the variable that was made local */
70 int flags; /* saved flags */
71 char *text; /* saved text */
72};
73
74
75struct localvar *localvars;
32931063 76extern int forcelocal;
984263bc 77
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78extern struct var vifs;
79extern struct var vmail;
80extern struct var vmpath;
81extern struct var vpath;
82extern struct var vppid;
83extern struct var vps1;
84extern struct var vps2;
0d5aaed6 85extern struct var vps4;
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86#ifndef NO_HISTORY
87extern struct var vhistsize;
99512ac4 88extern struct var vterm;
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89#endif
90
be4e801b 91extern int localeisutf8;
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92/* The parser uses the locale that was in effect at startup. */
93extern int initial_localeisutf8;
be4e801b 94
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95/*
96 * The following macros access the values of the above variables.
97 * They have to skip over the name. They return the null string
98 * for unset variables.
99 */
100
101#define ifsval() (vifs.text + 4)
102#define ifsset() ((vifs.flags & VUNSET) == 0)
103#define mailval() (vmail.text + 5)
104#define mpathval() (vmpath.text + 9)
105#define pathval() (vpath.text + 5)
106#define ps1val() (vps1.text + 4)
107#define ps2val() (vps2.text + 4)
0d5aaed6 108#define ps4val() (vps4.text + 4)
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109#define optindval() (voptind.text + 7)
110#ifndef NO_HISTORY
111#define histsizeval() (vhistsize.text + 9)
99512ac4 112#define termval() (vterm.text + 5)
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113#endif
114
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115#define mpathset() ((vmpath.flags & VUNSET) == 0)
116
117void initvar(void);
492efe05 118void setvar(const char *, const char *, int);
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119void setvareq(char *, int);
120struct strlist;
99512ac4 121void listsetvar(struct strlist *, int);
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122char *lookupvar(const char *);
123char *bltinlookup(const char *, int);
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124void bltinsetlocale(void);
125void bltinunsetlocale(void);
be4e801b 126void updatecharset(void);
145a4981 127void initcharset(void);
984263bc 128char **environment(void);
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129int showvarscmd(int, char **);
130int exportcmd(int, char **);
131int localcmd(int, char **);
132void mklocal(char *);
133void poplocalvars(void);
134int setvarcmd(int, char **);
135int unsetcmd(int, char **);
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136int unsetvar(const char *);
137int setvarsafe(const char *, const char *, int);