summaryrefslogtreecommitdiff
path: root/usr.bin/mail/vars.c
blob: 5d53ef582617274c038f18936a26059a03be0630 (plain)
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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/*	$NetBSD: vars.c,v 1.18 2007/10/27 15:14:51 christos Exp $	*/

/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)vars.c	8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: vars.c,v 1.18 2007/10/27 15:14:51 christos Exp $");
#endif
#endif /* not lint */

#include "rcv.h"
#include <util.h>

#include "extern.h"

/*
 * Mail -- a mail program
 *
 * Variable handling stuff.
 */

/*
 * Free up a variable string.  We do not bother to allocate
 * strings whose value is "" since they are expected to be frequent.
 * Thus, we cannot free same!
 */
PUBLIC void
v_free(char *cp)
{
	if (*cp)
		free(cp);
}

/*
 * Copy a variable value into permanent (ie, not collected after each
 * command) space.  Do not bother to alloc space for ""
 */
PUBLIC char *
vcopy(const char str[])
{
	char *new;
	size_t len;

	if (*str == '\0')
		return estrdup("");
	len = strlen(str) + 1;
	new = emalloc(len);
	(void)memmove(new, str, len);
	return new;
}

/*
 * Hash the passed string and return an index into
 * the variable or group hash table.
 */
PUBLIC int
hash(const char *name)
{
	int h = 0;

	while (*name) {
		h <<= 2;
		h += *name++;
	}
	if (h < 0 && (h = -h) < 0)
		h = 0;
	return h % HSHSIZE;
}

/*
 * Locate a variable and return its variable
 * node.
 */
PUBLIC struct var *
lookup(const char name[])
{
	struct var *vp;

	for (vp = variables[hash(name)]; vp != NULL; vp = vp->v_link)
		if (*vp->v_name == *name && equal(vp->v_name, name))
			return vp;
	return NULL;
}

/*
 * Assign a value to a variable.
 */
PUBLIC void
assign(const char name[], const char values[])
{
	struct var *vp;
	int h;

	h = hash(name);
	vp = lookup(name);
	if (vp == NULL) {
		vp = ecalloc(1, sizeof(*vp));
		vp->v_name = vcopy(name);
		vp->v_link = variables[h];
		variables[h] = vp;
	}
	else
                v_free(vp->v_value);
	vp->v_value = vcopy(values);
}

/*
 * Get the value of a variable and return it.
 * Look in the environment if its not available locally.
 */
PUBLIC char *
value(const char name[])
{
	struct var *vp;

	if ((vp = lookup(name)) == NULL)
		return getenv(name);
	return vp->v_value;
}

/*
 * Locate a group name and return it.
 */
PUBLIC struct grouphead *
findgroup(const char name[])
{
	struct grouphead *gh;

	for (gh = groups[hash(name)]; gh != NULL; gh = gh->g_link)
		if (*gh->g_name == *name && equal(gh->g_name, name))
			return gh;
	return NULL;
}

/*
 * Print a group out on stdout
 */
PUBLIC void
printgroup(const char name[])
{
	struct grouphead *gh;
	struct group *gp;

	if ((gh = findgroup(name)) == NULL) {
		(void)printf("\"%s\": not a group\n", name);
		return;
	}
	(void)printf("%s\t", gh->g_name);
	for (gp = gh->g_list; gp != NULL; gp = gp->ge_link)
		(void)printf(" %s", gp->ge_name);
	(void)putchar('\n');
}