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("$FreeBSD$"); 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 = db_vars + nitems(db_vars); 57 58 static int 59 db_find_variable(struct db_variable **varp) 60 { 61 struct db_variable *vp; 62 int t; 63 64 t = db_read_token(); 65 if (t == tIDENT) { 66 for (vp = db_vars; vp < db_evars; vp++) { 67 if (!strcmp(db_tok_string, vp->name)) { 68 *varp = vp; 69 return (1); 70 } 71 } 72 for (vp = db_regs; vp < db_eregs; vp++) { 73 if (!strcmp(db_tok_string, vp->name)) { 74 *varp = vp; 75 return (1); 76 } 77 } 78 } 79 db_error("Unknown variable\n"); 80 return (0); 81 } 82 83 int 84 db_get_variable(db_expr_t *valuep) 85 { 86 struct db_variable *vp; 87 88 if (!db_find_variable(&vp)) 89 return (0); 90 91 return (db_read_variable(vp, valuep)); 92 } 93 94 int 95 db_set_variable(db_expr_t value) 96 { 97 struct db_variable *vp; 98 99 if (!db_find_variable(&vp)) 100 return (0); 101 102 return (db_write_variable(vp, value)); 103 } 104 105 int 106 db_read_variable(struct db_variable *vp, db_expr_t *valuep) 107 { 108 db_varfcn_t *func = vp->fcn; 109 110 if (func == FCN_NULL) { 111 *valuep = *(vp->valuep); 112 return (1); 113 } 114 return ((*func)(vp, valuep, DB_VAR_GET)); 115 } 116 117 int 118 db_write_variable(struct db_variable *vp, db_expr_t value) 119 { 120 db_varfcn_t *func = vp->fcn; 121 122 if (func == FCN_NULL) { 123 *(vp->valuep) = value; 124 return (1); 125 } 126 return ((*func)(vp, &value, DB_VAR_SET)); 127 } 128 129 void 130 db_set_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 131 { 132 struct db_variable *vp; 133 db_expr_t value; 134 int t; 135 136 t = db_read_token(); 137 if (t != tDOLLAR) { 138 db_error("Unknown variable\n"); 139 return; 140 } 141 if (!db_find_variable(&vp)) { 142 db_error("Unknown variable\n"); 143 return; 144 } 145 146 t = db_read_token(); 147 if (t != tEQ) 148 db_unread_token(t); 149 150 if (!db_expression(&value)) { 151 db_error("No value\n"); 152 return; 153 } 154 if (db_read_token() != tEOL) 155 db_error("?\n"); 156 157 db_write_variable(vp, value); 158 } 159