summary refs log tree commit diff
path: root/src/var.h
blob: 7e7e505ad2657ac6bde98b726c6dbc4c663623cb (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1997-2005
 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)var.h	8.2 (Berkeley) 5/4/95
 */

#include <stdint.h>

/*
 * Shell variables.
 */

/* flags */
#define VEXPORT		0x01	/* variable is exported */
#define VREADONLY	0x02	/* variable cannot be modified */
#define VSTRFIXED	0x04	/* variable struct is statically allocated */
#define VTEXTFIXED	0x08	/* text is statically allocated */
#define VSTACK		0x10	/* text is allocated on the stack */
#define VUNSET		0x20	/* the variable is not set */
#define VNOFUNC		0x40	/* don't call the callback function */
#define VNOSET		0x80	/* do not set variable - just readonly test */
#define VNOSAVE		0x100	/* when text is on the heap before setvareq */


struct var {
	struct var *next;		/* next entry in hash list */
	int flags;			/* flags are defined above */
	const char *text;		/* name=value */
	void (*func)(const char *);
					/* function to be called when  */
					/* the variable gets set/unset */
};


struct localvar {
	struct localvar *next;		/* next local variable in list */
	struct var *vp;			/* the variable that was made local */
	int flags;			/* saved flags */
	const char *text;		/* saved text */
};

struct localvar_list;


extern struct localvar *localvars;
extern struct var varinit[];

#if ATTY
#define vatty varinit[0]
#define vifs varinit[1]
#else
#define vifs varinit[0]
#endif
#define vmail (&vifs)[1]
#define vmpath (&vmail)[1]
#define vpath (&vmpath)[1]
#define vps1 (&vpath)[1]
#define vps2 (&vps1)[1]
#define vps4 (&vps2)[1]
#define voptind (&vps4)[1]
#ifndef SMALL
#define vterm (&voptind)[1]
#define vhistsize (&vterm)[1]
#endif

#ifdef IFS_BROKEN
extern const char defifsvar[];
#define defifs (defifsvar + 4)
#else
extern const char defifs[];
#endif
extern const char defpathvar[];
#define defpath (defpathvar + 5)

/*
 * The following macros access the values of the above variables.
 * They have to skip over the name.  They return the null string
 * for unset variables.
 */

#define ifsval()	(vifs.text + 4)
#define ifsset()	((vifs.flags & VUNSET) == 0)
#define mailval()	(vmail.text + 5)
#define mpathval()	(vmpath.text + 9)
#define pathval()	(vpath.text + 5)
#define ps1val()	(vps1.text + 4)
#define ps2val()	(vps2.text + 4)
#define ps4val()	(vps4.text + 4)
#define optindval()	(voptind.text + 7)
#ifndef SMALL
#define histsizeval()	(vhistsize.text + 9)
#define termval()	(vterm.text + 5)
#endif

#if ATTY
#define attyset()	((vatty.flags & VUNSET) == 0)
#endif
#define mpathset()	((vmpath.flags & VUNSET) == 0)

void initvar(void);
void setvar(const char *, const char *, int);
intmax_t setvarint(const char *, intmax_t, int);
void setvareq(char *, int);
struct strlist;
void listsetvar(struct strlist *, int);
char *lookupvar(const char *);
intmax_t lookupvarint(const char *);
char **listvars(int, int, char ***);
#define environment() listvars(VEXPORT, VUNSET, 0)
int showvars(const char *, int, int);
int exportcmd(int, char **);
int localcmd(int, char **);
void mklocal(char *);
struct localvar_list *pushlocalvars(void);
void poplocalvars(int);
void unwindlocalvars(struct localvar_list *stop);
int unsetcmd(int, char **);
void unsetvar(const char *);
int varcmp(const char *, const char *);

static inline int varequal(const char *a, const char *b) {
	return !varcmp(a, b);
}

/*
 * Search the environment of a builtin command.
 */

static inline char *bltinlookup(const char *name)
{
	return lookupvar(name);
}