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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 static char sccsid[] = "@(#)vars.c 8.1 (Berkeley) 6/6/93";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
46 * Mail -- a mail program
48 * Variable handling stuff.
52 * Assign a value to a variable.
56 const char *name, *value;
64 vp = calloc(sizeof(*vp), 1);
65 vp->v_name = vcopy(name);
66 vp->v_link = variables[h];
71 vp->v_value = vcopy(value);
75 * Free up a variable string. We do not bother to allocate
76 * strings whose value is "" since they are expected to be frequent.
77 * Thus, we cannot free same!
88 * Copy a variable value into permanent (ie, not collected after each
89 * command) space. Do not bother to alloc space for ""
101 len = strlen(str) + 1;
102 if ((new = malloc(len)) == NULL)
103 err(1, "Out of memory");
104 bcopy(str, new, (int)len);
109 * Get the value of a variable and return it.
110 * Look in the environment if its not available locally.
119 if ((vp = lookup(name)) == NULL)
120 return (getenv(name));
121 return (vp->v_value);
125 * Locate a variable and return its variable
135 for (vp = variables[hash(name)]; vp != NULL; vp = vp->v_link)
136 if (*vp->v_name == *name && equal(vp->v_name, name))
142 * Locate a group name and return it.
149 struct grouphead *gh;
151 for (gh = groups[hash(name)]; gh != NULL; gh = gh->g_link)
152 if (*gh->g_name == *name && equal(gh->g_name, name))
158 * Print a group out on stdout
164 struct grouphead *gh;
167 if ((gh = findgroup(name)) == NULL) {
168 printf("\"%s\": not a group\n", name);
171 printf("%s\t", gh->g_name);
172 for (gp = gh->g_list; gp != NULL; gp = gp->ge_link)
173 printf(" %s", gp->ge_name);
178 * Hash the passed string and return an index into
179 * the variable or group hash table.
187 while (*name != '\0') {
191 if (h < 0 && (h = -h) < 0)
193 return (h % HSHSIZE);