1/*
2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie the
24 * rights to redistribute these changes.
25 *
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38
39#include <ddb/db_lex.h>
40#include <ddb/db_variables.h>
41
42void db_read_variable(struct db_variable *, db_expr_t *);
43static void db_write_variable(struct db_variable *, db_expr_t *);
44
45struct db_variable db_vars[] = {
46 { "radix", &db_radix, FCN_NULL },
47 { "maxoff", (int *)&db_maxoff, FCN_NULL },
48 { "maxwidth", &db_max_width, FCN_NULL },
49 { "tabstops", &db_tab_stop_width, FCN_NULL },
50};
51struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
52
53int
54db_find_variable(varp)
55 struct db_variable **varp;
56{
57 int t;
58 struct db_variable *vp;
59
60 t = db_read_token();
61 if (t == tIDENT) {
62 for (vp = db_vars; vp < db_evars; vp++) {
63 if (!strcmp(db_tok_string, vp->name)) {
64 *varp = vp;
65 return (1);
66 }
67 }
68 for (vp = db_regs; vp < db_eregs; vp++) {
69 if (!strcmp(db_tok_string, vp->name)) {
70 *varp = vp;
71 return (1);
72 }
73 }
74 }
75 db_error("Unknown variable\n");
76 return (0);
77}
78
79int
80db_get_variable(valuep)
81 db_expr_t *valuep;
82{
83 struct db_variable *vp;
84
85 if (!db_find_variable(&vp))
86 return (0);
87
88 db_read_variable(vp, valuep);
89
90 return (1);
91}
92
93int
94db_set_variable(value)
95 db_expr_t value;
96{
97 struct db_variable *vp;
98
99 if (!db_find_variable(&vp))
100 return (0);
101
102 db_write_variable(vp, &value);
103
104 return (1);
105}
106
107
108void
109db_read_variable(vp, valuep)
110 struct db_variable *vp;
111 db_expr_t *valuep;
112{
113 int (*func)() = vp->fcn;
114
115 if (func == FCN_NULL)
116 *valuep = *(vp->valuep);
117 else
118 (*func)(vp, valuep, DB_VAR_GET);
119}
120
121static void
122db_write_variable(vp, valuep)
123 struct db_variable *vp;
124 db_expr_t *valuep;
125{
126 int (*func)() = vp->fcn;
127
128 if (func == FCN_NULL)
129 *(vp->valuep) = *valuep;
130 else
131 (*func)(vp, valuep, DB_VAR_SET);
132}
133
134void
135db_set_cmd(db_expr_t dummy1, int dummy2, db_expr_t dummy3, char *dummy4)
136{
137 db_expr_t value;
138 int (*func)();
139 struct db_variable *vp;
140 int t;
141
142 t = db_read_token();
143 if (t != tDOLLAR) {
144 db_error("Unknown variable\n");
145 return;
146 }
147 if (!db_find_variable(&vp)) {
148 db_error("Unknown variable\n");
149 return;
150 }
151
152 t = db_read_token();
153 if (t != tEQ)
154 db_unread_token(t);
155
156 if (!db_expression(&value)) {
157 db_error("No value\n");
158 return;
159 }
160 if (db_read_token() != tEOL) {
161 db_error("?\n");
162 }
163
164 db_write_variable(vp, &value);
165}
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