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 /*
27 * Author: David B. Golub, Carnegie Mellon University
28 * Date: 7/90
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD: releng/9.2/sys/ddb/db_variables.c 195699 2009-07-14 22:48:30Z rwatson $");
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36
37 #include <ddb/ddb.h>
38 #include <ddb/db_lex.h>
39 #include <ddb/db_variables.h>
40
41 static int db_find_variable(struct db_variable **varp);
42
43 static struct db_variable db_vars[] = {
44 { "radix", &db_radix, FCN_NULL },
45 { "maxoff", &db_maxoff, FCN_NULL },
46 { "maxwidth", &db_max_width, FCN_NULL },
47 { "tabstops", &db_tab_stop_width, FCN_NULL },
48 { "lines", &db_lines_per_page, FCN_NULL },
49 { "curcpu", NULL, db_var_curcpu },
50 { "db_cpu", NULL, db_var_db_cpu },
51 #ifdef VIMAGE
52 { "curvnet", NULL, db_var_curvnet },
53 { "db_vnet", NULL, db_var_db_vnet },
54 #endif
55 };
56 static struct db_variable *db_evars =
57 db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
58
59 static int
60 db_find_variable(struct db_variable **varp)
61 {
62 struct db_variable *vp;
63 int t;
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
84 int
85 db_get_variable(db_expr_t *valuep)
86 {
87 struct db_variable *vp;
88
89 if (!db_find_variable(&vp))
90 return (0);
91
92 return (db_read_variable(vp, valuep));
93 }
94
95 int
96 db_set_variable(db_expr_t value)
97 {
98 struct db_variable *vp;
99
100 if (!db_find_variable(&vp))
101 return (0);
102
103 return (db_write_variable(vp, value));
104 }
105
106 int
107 db_read_variable(struct db_variable *vp, db_expr_t *valuep)
108 {
109 db_varfcn_t *func = vp->fcn;
110
111 if (func == FCN_NULL) {
112 *valuep = *(vp->valuep);
113 return (1);
114 }
115 return ((*func)(vp, valuep, DB_VAR_GET));
116 }
117
118 int
119 db_write_variable(struct db_variable *vp, db_expr_t value)
120 {
121 db_varfcn_t *func = vp->fcn;
122
123 if (func == FCN_NULL) {
124 *(vp->valuep) = value;
125 return (1);
126 }
127 return ((*func)(vp, &value, DB_VAR_SET));
128 }
129
130 void
131 db_set_cmd(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
132 {
133 struct db_variable *vp;
134 db_expr_t value;
135 int t;
136
137 t = db_read_token();
138 if (t != tDOLLAR) {
139 db_error("Unknown variable\n");
140 return;
141 }
142 if (!db_find_variable(&vp)) {
143 db_error("Unknown variable\n");
144 return;
145 }
146
147 t = db_read_token();
148 if (t != tEQ)
149 db_unread_token(t);
150
151 if (!db_expression(&value)) {
152 db_error("No value\n");
153 return;
154 }
155 if (db_read_token() != tEOL)
156 db_error("?\n");
157
158 db_write_variable(vp, value);
159 }
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