Annotation of src/usr.bin/window/var.c, Revision 1.2
1.2 ! deraadt 1: /* $OpenBSD: var.c,v 1.4 1995/09/28 10:35:01 tls Exp $ */
1.1 deraadt 2: /* $NetBSD: var.c,v 1.4 1995/09/28 10:35:01 tls Exp $ */
3:
4: /*
5: * Copyright (c) 1983, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Edward Wang at The University of California, Berkeley.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the University of
22: * California, Berkeley and its contributors.
23: * 4. Neither the name of the University nor the names of its contributors
24: * may be used to endorse or promote products derived from this software
25: * without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37: * SUCH DAMAGE.
38: */
39:
40: #ifndef lint
41: #if 0
42: static char sccsid[] = "@(#)var.c 8.1 (Berkeley) 6/6/93";
43: #else
1.2 ! deraadt 44: static char rcsid[] = "$OpenBSD: var.c,v 1.4 1995/09/28 10:35:01 tls Exp $";
1.1 deraadt 45: #endif
46: #endif /* not lint */
47:
48: #include "value.h"
49: #include "var.h"
50: #include "string.h"
51: #include <stdlib.h>
52:
53: struct var *
54: var_set1(head, name, v)
55: struct var **head;
56: char *name;
57: struct value *v;
58: {
59: register struct var **p;
60: register struct var *r;
61: struct value val;
62:
63: /* do this first, easier to recover */
64: val = *v;
65: if (val.v_type == V_STR && val.v_str != 0 &&
66: (val.v_str = str_cpy(val.v_str)) == 0)
67: return 0;
68: if (*(p = var_lookup1(head, name)) == 0) {
69: r = (struct var *) malloc(sizeof (struct var));
70: if (r == 0) {
71: val_free(val);
72: return 0;
73: }
74: if ((r->r_name = str_cpy(name)) == 0) {
75: val_free(val);
76: free((char *) r);
77: return 0;
78: }
79: r->r_left = r->r_right = 0;
80: *p = r;
81: } else {
82: r = *p;
83: val_free(r->r_val);
84: }
85: r->r_val = val;
86: return r;
87: }
88:
89: struct var *
90: var_setstr1(head, name, str)
91: struct var **head;
92: char *name;
93: char *str;
94: {
95: struct value v;
96:
97: v.v_type = V_STR;
98: v.v_str = str;
99: return var_set1(head, name, &v);
100: }
101:
102: struct var *
103: var_setnum1(head, name, num)
104: struct var **head;
105: char *name;
106: int num;
107: {
108: struct value v;
109:
110: v.v_type = V_NUM;
111: v.v_num = num;
112: return var_set1(head, name, &v);
113: }
114:
115: var_unset1(head, name)
116: struct var **head;
117: char *name;
118: {
119: register struct var **p;
120: register struct var *r;
121:
122: if (*(p = var_lookup1(head, name)) == 0)
123: return -1;
124: r = *p;
125: *p = r->r_left;
126: while (*p != 0)
127: p = &(*p)->r_right;
128: *p = r->r_right;
129: val_free(r->r_val);
130: str_free(r->r_name);
131: free((char *) r);
132: return 0;
133: }
134:
135: struct var **
136: var_lookup1(p, name)
137: register struct var **p;
138: register char *name;
139: {
140: register cmp;
141:
142: while (*p != 0) {
143: if ((cmp = strcmp(name, (*p)->r_name)) < 0)
144: p = &(*p)->r_left;
145: else if (cmp > 0)
146: p = &(*p)->r_right;
147: else
148: break;
149: }
150: return p;
151: }
152:
153: var_walk1(r, func, a)
154: register struct var *r;
155: int (*func)();
156: long a;
157: {
158: if (r == 0)
159: return 0;
160: if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
161: || var_walk1(r->r_right, func, a) < 0)
162: return -1;
163: return 0;
164: }
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