2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
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33 * @(#)vars.c 8.1 (Berkeley) 6/6/93
34 * $FreeBSD: src/usr.bin/mail/vars.c,v 1.1.1.1.14.3 2003/01/06 05:46:04 mikeh Exp $
35 * $DragonFly: src/usr.bin/mail/vars.c,v 1.2 2003/06/17 04:29:28 dillon Exp $
42 * Mail -- a mail program
44 * Variable handling stuff.
48 * Assign a value to a variable.
52 const char *name, *value;
60 vp = calloc(sizeof(*vp), 1);
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!
84 * Copy a variable value into permanent (ie, not collected after each
85 * command) space. Do not bother to alloc space for ""
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.
115 if ((vp = lookup(name)) == NULL)
116 return (getenv(name));
117 return (vp->v_value);
121 * Locate a variable and return its variable
131 for (vp = variables[hash(name)]; vp != NULL; vp = vp->v_link)
132 if (*vp->v_name == *name && equal(vp->v_name, name))
138 * Locate a group name and return it.
145 struct grouphead *gh;
147 for (gh = groups[hash(name)]; gh != NULL; gh = gh->g_link)
148 if (*gh->g_name == *name && equal(gh->g_name, name))
154 * Print a group out on stdout
160 struct grouphead *gh;
163 if ((gh = findgroup(name)) == NULL) {
164 printf("\"%s\": not a group\n", name);
167 printf("%s\t", gh->g_name);
168 for (gp = gh->g_list; gp != NULL; gp = gp->ge_link)
169 printf(" %s", gp->ge_name);
174 * Hash the passed string and return an index into
175 * the variable or group hash table.
183 while (*name != '\0') {
187 if (h < 0 && (h = -h) < 0)
189 return (h % HSHSIZE);