2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 static char sccsid[] = "@(#)vars.c 8.1 (Berkeley) 6/6/93";
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
44 * Mail -- a mail program
46 * Variable handling stuff.
50 * Assign a value to a variable.
53 assign(const char *name, const char *value)
61 if ((vp = calloc(1, sizeof(*vp))) == NULL)
62 err(1, "Out of memory");
63 vp->v_name = vcopy(name);
64 vp->v_link = variables[h];
69 vp->v_value = vcopy(value);
73 * Free up a variable string. We do not bother to allocate
74 * strings whose value is "" since they are expected to be frequent.
75 * Thus, we cannot free same!
85 * Copy a variable value into permanent (ie, not collected after each
86 * command) space. Do not bother to alloc space for ""
90 vcopy(const char *str)
97 len = strlen(str) + 1;
98 if ((new = malloc(len)) == NULL)
99 err(1, "Out of memory");
100 bcopy(str, new, (int)len);
105 * Get the value of a variable and return it.
106 * Look in the environment if its not available locally.
110 value(const char *name)
114 if ((vp = lookup(name)) == NULL)
115 return (getenv(name));
116 return (vp->v_value);
120 * Locate a variable and return its variable
125 lookup(const char *name)
129 for (vp = variables[hash(name)]; vp != NULL; vp = vp->v_link)
130 if (*vp->v_name == *name && equal(vp->v_name, name))
136 * Locate a group name and return it.
140 findgroup(char name[])
142 struct grouphead *gh;
144 for (gh = groups[hash(name)]; gh != NULL; gh = gh->g_link)
145 if (*gh->g_name == *name && equal(gh->g_name, name))
151 * Print a group out on stdout
154 printgroup(char name[])
156 struct grouphead *gh;
159 if ((gh = findgroup(name)) == NULL) {
160 printf("\"%s\": not a group\n", name);
163 printf("%s\t", gh->g_name);
164 for (gp = gh->g_list; gp != NULL; gp = gp->ge_link)
165 printf(" %s", gp->ge_name);
170 * Hash the passed string and return an index into
171 * the variable or group hash table.
174 hash(const char *name)
178 while (*name != '\0') {
182 if (h < 0 && (h = -h) < 0)
184 return (h % HSHSIZE);