1 /*
2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)vars.c 8.1 (Berkeley) 6/6/93
30 * $FreeBSD: src/usr.bin/mail/vars.c,v 1.1.1.1.14.3 2003/01/06 05:46:04 mikeh Exp $
31 * $DragonFly: src/usr.bin/mail/vars.c,v 1.4 2004/09/08 03:01:11 joerg Exp $
32 */
33
34 #include "rcv.h"
35 #include "extern.h"
36
37 /*
38 * Mail -- a mail program
39 *
40 * Variable handling stuff.
41 */
42
43 /*
44 * Assign a value to a variable.
45 */
46 void
assign(const char * name,const char * value)47 assign(const char *name, const char *value)
48 {
49 struct var *vp;
50 int h;
51
52 h = hash(name);
53 vp = lookup(name);
54 if (vp == NULL) {
55 vp = calloc(sizeof(*vp), 1);
56 vp->v_name = vcopy(name);
57 vp->v_link = variables[h];
58 variables[h] = vp;
59 }
60 else
61 vfree(vp->v_value);
62 vp->v_value = vcopy(value);
63 }
64
65 /*
66 * Free up a variable string. We do not bother to allocate
67 * strings whose value is "" since they are expected to be frequent.
68 * Thus, we cannot free same!
69 */
70 void
vfree(char * cp)71 vfree(char *cp)
72 {
73 if (*cp != '\0')
74 free(cp);
75 }
76
77 /*
78 * Copy a variable value into permanent (ie, not collected after each
79 * command) space. Do not bother to alloc space for ""
80 */
81
82 char *
vcopy(const char * str)83 vcopy(const char *str)
84 {
85 char *new;
86 unsigned len;
87
88 if (*str == '\0')
89 return ("");
90 len = strlen(str) + 1;
91 if ((new = malloc(len)) == NULL)
92 err(1, "Out of memory");
93 bcopy(str, new, (int)len);
94 return (new);
95 }
96
97 /*
98 * Get the value of a variable and return it.
99 * Look in the environment if its not available locally.
100 */
101
102 char *
value(const char * name)103 value(const char *name)
104 {
105 struct var *vp;
106
107 if ((vp = lookup(name)) == NULL)
108 return (getenv(name));
109 return (vp->v_value);
110 }
111
112 /*
113 * Locate a variable and return its variable
114 * node.
115 */
116
117 struct var *
lookup(const char * name)118 lookup(const char *name)
119 {
120 struct var *vp;
121
122 for (vp = variables[hash(name)]; vp != NULL; vp = vp->v_link)
123 if (*vp->v_name == *name && equal(vp->v_name, name))
124 return (vp);
125 return (NULL);
126 }
127
128 /*
129 * Locate a group name and return it.
130 */
131
132 struct grouphead *
findgroup(char * name)133 findgroup(char *name)
134 {
135 struct grouphead *gh;
136
137 for (gh = groups[hash(name)]; gh != NULL; gh = gh->g_link)
138 if (*gh->g_name == *name && equal(gh->g_name, name))
139 return (gh);
140 return (NULL);
141 }
142
143 /*
144 * Print a group out on stdout
145 */
146 void
printgroup(char * name)147 printgroup(char *name)
148 {
149 struct grouphead *gh;
150 struct group *gp;
151
152 if ((gh = findgroup(name)) == NULL) {
153 printf("\"%s\": not a group\n", name);
154 return;
155 }
156 printf("%s\t", gh->g_name);
157 for (gp = gh->g_list; gp != NULL; gp = gp->ge_link)
158 printf(" %s", gp->ge_name);
159 printf("\n");
160 }
161
162 /*
163 * Hash the passed string and return an index into
164 * the variable or group hash table.
165 */
166 int
hash(const char * name)167 hash(const char *name)
168 {
169 int h = 0;
170
171 while (*name != '\0') {
172 h <<= 2;
173 h += *name++;
174 }
175 if (h < 0 && (h = -h) < 0)
176 h = 0;
177 return (h % HSHSIZE);
178 }
179