1 /*- 2 * SPDX-License-Identifier: MIT-CMU 3 * 4 * Mach Operating System 5 * Copyright (c) 1991,1990 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie the 26 * rights to redistribute these changes. 27 */ 28 /* 29 * Author: David B. Golub, Carnegie Mellon University 30 * Date: 7/90 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 36 #include <ddb/ddb.h> 37 #include <ddb/db_lex.h> 38 #include <ddb/db_variables.h> 39 40 static int db_find_variable(struct db_variable **varp); 41 42 static struct db_variable db_vars[] = { 43 { "radix", &db_radix, FCN_NULL }, 44 { "maxoff", &db_maxoff, FCN_NULL }, 45 { "maxwidth", &db_max_width, FCN_NULL }, 46 { "tabstops", &db_tab_stop_width, FCN_NULL }, 47 { "lines", &db_lines_per_page, FCN_NULL }, 48 { "curcpu", NULL, db_var_curcpu }, 49 { "db_cpu", NULL, db_var_db_cpu }, 50 #ifdef VIMAGE 51 { "curvnet", NULL, db_var_curvnet }, 52 { "db_vnet", NULL, db_var_db_vnet }, 53 #endif 54 }; 55 static struct db_variable *db_evars = db_vars + nitems(db_vars); 56 57 static int 58 db_find_variable(struct db_variable **varp) 59 { 60 struct db_variable *vp; 61 int t; 62 63 t = db_read_token(); 64 if (t == tIDENT) { 65 for (vp = db_vars; vp < db_evars; vp++) { 66 if (!strcmp(db_tok_string, vp->name)) { 67 *varp = vp; 68 return (1); 69 } 70 } 71 for (vp = db_regs; vp < db_eregs; vp++) { 72 if (!strcmp(db_tok_string, vp->name)) { 73 *varp = vp; 74 return (1); 75 } 76 } 77 } 78 db_error("Unknown variable\n"); 79 return (0); 80 } 81 82 int 83 db_get_variable(db_expr_t *valuep) 84 { 85 struct db_variable *vp; 86 87 if (!db_find_variable(&vp)) 88 return (0); 89 90 return (db_read_variable(vp, valuep)); 91 } 92 93 int 94 db_set_variable(db_expr_t value) 95 { 96 struct db_variable *vp; 97 98 if (!db_find_variable(&vp)) 99 return (0); 100 101 return (db_write_variable(vp, value)); 102 } 103 104 int 105 db_read_variable(struct db_variable *vp, db_expr_t *valuep) 106 { 107 db_varfcn_t *func = vp->fcn; 108 109 if (func == FCN_NULL) { 110 *valuep = *(vp->valuep); 111 return (1); 112 } 113 return ((*func)(vp, valuep, DB_VAR_GET)); 114 } 115 116 int 117 db_write_variable(struct db_variable *vp, db_expr_t value) 118 { 119 db_varfcn_t *func = vp->fcn; 120 121 if (func == FCN_NULL) { 122 *(vp->valuep) = value; 123 return (1); 124 } 125 return ((*func)(vp, &value, DB_VAR_SET)); 126 } 127 128 void 129 db_set_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4) 130 { 131 struct db_variable *vp; 132 db_expr_t value; 133 int t; 134 135 t = db_read_token(); 136 if (t == tEOL) { 137 for (vp = db_vars; vp < db_evars; vp++) { 138 if (!db_read_variable(vp, &value)) { 139 db_printf("$%s\n", vp->name); 140 continue; 141 } 142 db_printf("$%-8s = %ld\n", 143 vp->name, (unsigned long)value); 144 } 145 return; 146 } 147 if (t != tDOLLAR) { 148 db_error("Unknown variable\n"); 149 return; 150 } 151 if (!db_find_variable(&vp)) { 152 db_error("Unknown variable\n"); 153 return; 154 } 155 156 t = db_read_token(); 157 if (t != tEQ) 158 db_unread_token(t); 159 160 if (!db_expression(&value)) { 161 db_error("No value\n"); 162 return; 163 } 164 if (db_read_token() != tEOL) 165 db_error("?\n"); 166 167 db_write_variable(vp, value); 168 } 169