Collapse gd_astpending and gd_reqpri together into gd_reqflags. gd_reqflags
[dragonfly.git] / sys / ddb / db_variables.c
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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 *
26 * $FreeBSD: src/sys/ddb/db_variables.c,v 1.18 1999/08/28 00:41:11 peter Exp $
1de703da 27 * $DragonFly: src/sys/ddb/db_variables.c,v 1.2 2003/06/17 04:28:20 dillon Exp $
984263bc
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28 */
29
30/*
31 * Author: David B. Golub, Carnegie Mellon University
32 * Date: 7/90
33 */
34
35#include <sys/param.h>
36#include <sys/systm.h>
37
38#include <ddb/ddb.h>
39#include <ddb/db_lex.h>
40#include <ddb/db_variables.h>
41
42static int db_find_variable __P((struct db_variable **varp));
43static void db_write_variable __P((struct db_variable *, db_expr_t *));
44
45#ifdef notused
46static int db_set_variable __P((db_expr_t value));
47#endif
48
49static struct db_variable db_vars[] = {
50 { "radix", &db_radix, FCN_NULL },
51 { "maxoff", &db_maxoff, FCN_NULL },
52 { "maxwidth", &db_max_width, FCN_NULL },
53 { "tabstops", &db_tab_stop_width, FCN_NULL },
54};
55static struct db_variable *db_evars =
56 db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
57
58static int
59db_find_variable(varp)
60 struct db_variable **varp;
61{
62 int t;
63 struct db_variable *vp;
64
65 t = db_read_token();
66 if (t == tIDENT) {
67 for (vp = db_vars; vp < db_evars; vp++) {
68 if (!strcmp(db_tok_string, vp->name)) {
69 *varp = vp;
70 return (1);
71 }
72 }
73 for (vp = db_regs; vp < db_eregs; vp++) {
74 if (!strcmp(db_tok_string, vp->name)) {
75 *varp = vp;
76 return (1);
77 }
78 }
79 }
80 db_error("Unknown variable\n");
81 return (0);
82}
83
84int
85db_get_variable(valuep)
86 db_expr_t *valuep;
87{
88 struct db_variable *vp;
89
90 if (!db_find_variable(&vp))
91 return (0);
92
93 db_read_variable(vp, valuep);
94
95 return (1);
96}
97
98#ifdef notused
99static int
100db_set_variable(value)
101 db_expr_t value;
102{
103 struct db_variable *vp;
104
105 if (!db_find_variable(&vp))
106 return (0);
107
108 db_write_variable(vp, &value);
109
110 return (1);
111}
112#endif
113
114void
115db_read_variable(vp, valuep)
116 struct db_variable *vp;
117 db_expr_t *valuep;
118{
119 db_varfcn_t *func = vp->fcn;
120
121 if (func == FCN_NULL)
122 *valuep = *(vp->valuep);
123 else
124 (*func)(vp, valuep, DB_VAR_GET);
125}
126
127static void
128db_write_variable(vp, valuep)
129 struct db_variable *vp;
130 db_expr_t *valuep;
131{
132 db_varfcn_t *func = vp->fcn;
133
134 if (func == FCN_NULL)
135 *(vp->valuep) = *valuep;
136 else
137 (*func)(vp, valuep, DB_VAR_SET);
138}
139
140void
141db_set_cmd(dummy1, dummy2, dummy3, dummy4)
142 db_expr_t dummy1;
143 boolean_t dummy2;
144 db_expr_t dummy3;
145 char * dummy4;
146{
147 db_expr_t value;
148 struct db_variable *vp;
149 int t;
150
151 t = db_read_token();
152 if (t != tDOLLAR) {
153 db_error("Unknown variable\n");
154 return;
155 }
156 if (!db_find_variable(&vp)) {
157 db_error("Unknown variable\n");
158 return;
159 }
160
161 t = db_read_token();
162 if (t != tEQ)
163 db_unread_token(t);
164
165 if (!db_expression(&value)) {
166 db_error("No value\n");
167 return;
168 }
169 if (db_read_token() != tEOL) {
170 db_error("?\n");
171 }
172
173 db_write_variable(vp, &value);
174}