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 static void db_write_variable(struct db_variable *, db_expr_t *); 43 44 #ifdef notused 45 static int db_set_variable(db_expr_t value); 46 #endif 47 48 static struct db_variable db_vars[] = { 49 { "radix", &db_radix, FCN_NULL }, 50 { "maxoff", &db_maxoff, FCN_NULL }, 51 { "maxwidth", &db_max_width, FCN_NULL }, 52 { "tabstops", &db_tab_stop_width, FCN_NULL }, 53 }; 54 static struct db_variable *db_evars = 55 db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 56 57 static int 58 db_find_variable(varp) 59 struct db_variable **varp; 60 { 61 int t; 62 struct db_variable *vp; 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(valuep) 85 db_expr_t *valuep; 86 { 87 struct db_variable *vp; 88 89 if (!db_find_variable(&vp)) 90 return (0); 91 92 db_read_variable(vp, valuep); 93 94 return (1); 95 } 96 97 #ifdef notused 98 static int 99 db_set_variable(value) 100 db_expr_t value; 101 { 102 struct db_variable *vp; 103 104 if (!db_find_variable(&vp)) 105 return (0); 106 107 db_write_variable(vp, &value); 108 109 return (1); 110 } 111 #endif 112 113 void 114 db_read_variable(vp, valuep) 115 struct db_variable *vp; 116 db_expr_t *valuep; 117 { 118 db_varfcn_t *func = vp->fcn; 119 120 if (func == FCN_NULL) 121 *valuep = *(vp->valuep); 122 else 123 (*func)(vp, valuep, DB_VAR_GET); 124 } 125 126 static void 127 db_write_variable(vp, valuep) 128 struct db_variable *vp; 129 db_expr_t *valuep; 130 { 131 db_varfcn_t *func = vp->fcn; 132 133 if (func == FCN_NULL) 134 *(vp->valuep) = *valuep; 135 else 136 (*func)(vp, valuep, DB_VAR_SET); 137 } 138 139 void 140 db_set_cmd(dummy1, dummy2, dummy3, dummy4) 141 db_expr_t dummy1; 142 boolean_t dummy2; 143 db_expr_t dummy3; 144 char * dummy4; 145 { 146 db_expr_t value; 147 struct db_variable *vp; 148 int t; 149 150 t = db_read_token(); 151 if (t != tDOLLAR) { 152 db_error("Unknown variable\n"); 153 return; 154 } 155 if (!db_find_variable(&vp)) { 156 db_error("Unknown variable\n"); 157 return; 158 } 159 160 t = db_read_token(); 161 if (t != tEQ) 162 db_unread_token(t); 163 164 if (!db_expression(&value)) { 165 db_error("No value\n"); 166 return; 167 } 168 if (db_read_token() != tEOL) { 169 db_error("?\n"); 170 } 171 172 db_write_variable(vp, &value); 173 } 174