2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 * 4. 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.
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
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26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 static char sccsid[] = "@(#)vars.c 8.1 (Berkeley) 6/6/93";
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
42 * Mail -- a mail program
44 * Variable handling stuff.
48 * Assign a value to a variable.
51 assign(const char *name, const char *value)
59 if ((vp = calloc(1, sizeof(*vp))) == NULL)
60 err(1, "Out of memory");
61 vp->v_name = vcopy(name);
62 vp->v_link = variables[h];
67 vp->v_value = vcopy(value);
71 * Free up a variable string. We do not bother to allocate
72 * strings whose value is "" since they are expected to be frequent.
73 * Thus, we cannot free same!
83 * Copy a variable value into permanent (ie, not collected after each
84 * command) space. Do not bother to alloc space for ""
88 vcopy(const char *str)
95 len = strlen(str) + 1;
96 if ((new = malloc(len)) == NULL)
97 err(1, "Out of memory");
98 bcopy(str, new, (int)len);
103 * Get the value of a variable and return it.
104 * Look in the environment if its not available locally.
108 value(const char *name)
112 if ((vp = lookup(name)) == NULL)
113 return (getenv(name));
114 return (vp->v_value);
118 * Locate a variable and return its variable
123 lookup(const char *name)
127 for (vp = variables[hash(name)]; vp != NULL; vp = vp->v_link)
128 if (*vp->v_name == *name && equal(vp->v_name, name))
134 * Locate a group name and return it.
138 findgroup(char name[])
140 struct grouphead *gh;
142 for (gh = groups[hash(name)]; gh != NULL; gh = gh->g_link)
143 if (*gh->g_name == *name && equal(gh->g_name, name))
149 * Print a group out on stdout
152 printgroup(char name[])
154 struct grouphead *gh;
157 if ((gh = findgroup(name)) == NULL) {
158 printf("\"%s\": not a group\n", name);
161 printf("%s\t", gh->g_name);
162 for (gp = gh->g_list; gp != NULL; gp = gp->ge_link)
163 printf(" %s", gp->ge_name);
168 * Hash the passed string and return an index into
169 * the variable or group hash table.
172 hash(const char *name)
176 while (*name != '\0') {
180 if (h < 0 && (h = -h) < 0)
182 return (h % HSHSIZE);