Annotation of src/usr.bin/window/var.c, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: var.c,v 1.4 1995/09/28 10:35:01 tls Exp $ */
2:
3: /*
4: * Copyright (c) 1983, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Edward Wang at The University of California, Berkeley.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: */
38:
39: #ifndef lint
40: #if 0
41: static char sccsid[] = "@(#)var.c 8.1 (Berkeley) 6/6/93";
42: #else
43: static char rcsid[] = "$NetBSD: var.c,v 1.4 1995/09/28 10:35:01 tls Exp $";
44: #endif
45: #endif /* not lint */
46:
47: #include "value.h"
48: #include "var.h"
49: #include "string.h"
50: #include <stdlib.h>
51:
52: struct var *
53: var_set1(head, name, v)
54: struct var **head;
55: char *name;
56: struct value *v;
57: {
58: register struct var **p;
59: register struct var *r;
60: struct value val;
61:
62: /* do this first, easier to recover */
63: val = *v;
64: if (val.v_type == V_STR && val.v_str != 0 &&
65: (val.v_str = str_cpy(val.v_str)) == 0)
66: return 0;
67: if (*(p = var_lookup1(head, name)) == 0) {
68: r = (struct var *) malloc(sizeof (struct var));
69: if (r == 0) {
70: val_free(val);
71: return 0;
72: }
73: if ((r->r_name = str_cpy(name)) == 0) {
74: val_free(val);
75: free((char *) r);
76: return 0;
77: }
78: r->r_left = r->r_right = 0;
79: *p = r;
80: } else {
81: r = *p;
82: val_free(r->r_val);
83: }
84: r->r_val = val;
85: return r;
86: }
87:
88: struct var *
89: var_setstr1(head, name, str)
90: struct var **head;
91: char *name;
92: char *str;
93: {
94: struct value v;
95:
96: v.v_type = V_STR;
97: v.v_str = str;
98: return var_set1(head, name, &v);
99: }
100:
101: struct var *
102: var_setnum1(head, name, num)
103: struct var **head;
104: char *name;
105: int num;
106: {
107: struct value v;
108:
109: v.v_type = V_NUM;
110: v.v_num = num;
111: return var_set1(head, name, &v);
112: }
113:
114: var_unset1(head, name)
115: struct var **head;
116: char *name;
117: {
118: register struct var **p;
119: register struct var *r;
120:
121: if (*(p = var_lookup1(head, name)) == 0)
122: return -1;
123: r = *p;
124: *p = r->r_left;
125: while (*p != 0)
126: p = &(*p)->r_right;
127: *p = r->r_right;
128: val_free(r->r_val);
129: str_free(r->r_name);
130: free((char *) r);
131: return 0;
132: }
133:
134: struct var **
135: var_lookup1(p, name)
136: register struct var **p;
137: register char *name;
138: {
139: register cmp;
140:
141: while (*p != 0) {
142: if ((cmp = strcmp(name, (*p)->r_name)) < 0)
143: p = &(*p)->r_left;
144: else if (cmp > 0)
145: p = &(*p)->r_right;
146: else
147: break;
148: }
149: return p;
150: }
151:
152: var_walk1(r, func, a)
153: register struct var *r;
154: int (*func)();
155: long a;
156: {
157: if (r == 0)
158: return 0;
159: if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
160: || var_walk1(r->r_right, func, a) < 0)
161: return -1;
162: return 0;
163: }
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