Annotation of src/usr.bin/mail/vars.c, Revision 1.8
1.8 ! millert 1: /* $OpenBSD: vars.c,v 1.7 2001/11/21 15:26:39 millert Exp $ */
1.2 deraadt 2: /* $NetBSD: vars.c,v 1.4 1996/06/08 19:48:45 christos Exp $ */
3:
1.1 deraadt 4: /*
5: * Copyright (c) 1980, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
1.2 deraadt 38: #if 0
1.7 millert 39: static const char sccsid[] = "@(#)vars.c 8.1 (Berkeley) 6/6/93";
1.2 deraadt 40: #else
1.8 ! millert 41: static const char rcsid[] = "$OpenBSD: vars.c,v 1.7 2001/11/21 15:26:39 millert Exp $";
1.2 deraadt 42: #endif
1.1 deraadt 43: #endif /* not lint */
44:
45: #include "rcv.h"
46: #include "extern.h"
47:
48: /*
49: * Mail -- a mail program
50: *
51: * Variable handling stuff.
52: */
53:
54: /*
55: * Assign a value to a variable.
56: */
57: void
1.7 millert 58: assign(char *name, char *value)
1.1 deraadt 59: {
1.5 millert 60: struct var *vp;
61: int h;
1.1 deraadt 62:
63: h = hash(name);
64: vp = lookup(name);
1.7 millert 65: if (vp == NULL) {
1.8 ! millert 66: if ((vp = (struct var *)calloc(sizeof(*vp), 1)) == NULL)
! 67: errx(1, "Out of memory");
1.1 deraadt 68: vp->v_name = vcopy(name);
69: vp->v_link = variables[h];
70: variables[h] = vp;
71: }
72: else
73: vfree(vp->v_value);
74: vp->v_value = vcopy(value);
75: }
76:
77: /*
78: * Free up a variable string. We do not bother to allocate
79: * strings whose value is "" since they are expected to be frequent.
80: * Thus, we cannot free same!
81: */
82: void
1.7 millert 83: vfree(char *cp)
1.1 deraadt 84: {
1.7 millert 85:
1.1 deraadt 86: if (*cp)
1.4 millert 87: (void)free(cp);
1.1 deraadt 88: }
89:
90: /*
91: * Copy a variable value into permanent (ie, not collected after each
92: * command) space. Do not bother to alloc space for ""
93: */
94: char *
1.7 millert 95: vcopy(char *str)
1.1 deraadt 96: {
97: char *new;
98:
99: if (*str == '\0')
1.3 millert 100: return("");
1.7 millert 101: if ((new = strdup(str)) == NULL)
1.5 millert 102: errx(1, "Out of memory");
1.3 millert 103: return(new);
1.1 deraadt 104: }
105:
106: /*
107: * Get the value of a variable and return it.
108: * Look in the environment if its not available locally.
109: */
110:
111: char *
1.7 millert 112: value(char *name)
1.1 deraadt 113: {
1.5 millert 114: struct var *vp;
1.6 millert 115: char *env;
1.1 deraadt 116:
1.7 millert 117: if ((vp = lookup(name)) != NULL)
1.6 millert 118: return(vp->v_value);
119: else if ((env = getenv(name)))
120: return(env);
121: /* not set, see if we can provide a default */
122: else if (strcmp(name, "SHELL") == 0)
123: return(_PATH_CSHELL);
124: else if (strcmp(name, "LISTER") == 0)
125: return(_PATH_LS);
126: else if (strcmp(name, "PAGER") == 0)
127: return(_PATH_MORE);
128: else
129: return(NULL);
1.1 deraadt 130: }
131:
132: /*
133: * Locate a variable and return its variable
134: * node.
135: */
136: struct var *
1.7 millert 137: lookup(char *name)
1.1 deraadt 138: {
1.5 millert 139: struct var *vp;
1.1 deraadt 140:
1.7 millert 141: for (vp = variables[hash(name)]; vp != NULL; vp = vp->v_link)
1.1 deraadt 142: if (*vp->v_name == *name && equal(vp->v_name, name))
143: return(vp);
1.7 millert 144: return(NULL);
1.1 deraadt 145: }
146:
147: /*
148: * Locate a group name and return it.
149: */
150: struct grouphead *
1.7 millert 151: findgroup(char *name)
1.1 deraadt 152: {
1.5 millert 153: struct grouphead *gh;
1.1 deraadt 154:
1.7 millert 155: for (gh = groups[hash(name)]; gh != NULL; gh = gh->g_link)
1.1 deraadt 156: if (*gh->g_name == *name && equal(gh->g_name, name))
157: return(gh);
1.7 millert 158: return(NULL);
1.1 deraadt 159: }
160:
161: /*
162: * Print a group out on stdout
163: */
164: void
1.7 millert 165: printgroup(char *name)
1.1 deraadt 166: {
1.5 millert 167: struct grouphead *gh;
168: struct group *gp;
1.1 deraadt 169:
1.7 millert 170: if ((gh = findgroup(name)) == NULL) {
1.1 deraadt 171: printf("\"%s\": not a group\n", name);
172: return;
173: }
174: printf("%s\t", gh->g_name);
1.7 millert 175: for (gp = gh->g_list; gp != NULL; gp = gp->ge_link)
1.1 deraadt 176: printf(" %s", gp->ge_name);
177: putchar('\n');
178: }
179:
180: /*
181: * Hash the passed string and return an index into
182: * the variable or group hash table.
183: */
184: int
1.7 millert 185: hash(char *name)
1.1 deraadt 186: {
1.5 millert 187: int h = 0;
1.1 deraadt 188:
189: while (*name) {
190: h <<= 2;
191: h += *name++;
192: }
193: if (h < 0 && (h = -h) < 0)
194: h = 0;
1.3 millert 195: return(h % HSHSIZE);
1.1 deraadt 196: }
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