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 = 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, bool 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 } 160