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 * $FreeBSD: src/sys/ddb/db_variables.c,v 1.18 1999/08/28 00:41:11 peter Exp $ 27 * $DragonFly: src/sys/ddb/db_variables.c,v 1.4 2005/12/23 21:35:44 swildner Exp $ 28 */ 29 30 /* 31 * Author: David B. Golub, Carnegie Mellon University 32 * Date: 7/90 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 38 #include <ddb/ddb.h> 39 #include <ddb/db_lex.h> 40 #include <ddb/db_variables.h> 41 42 static int db_find_variable (struct db_variable **varp); 43 static void db_write_variable (struct db_variable *, db_expr_t *); 44 45 #ifdef notused 46 static int db_set_variable (db_expr_t value); 47 #endif 48 49 static struct db_variable db_vars[] = { 50 { "radix", &db_radix, NULL }, 51 { "maxoff", &db_maxoff, NULL }, 52 { "maxwidth", &db_max_width, NULL }, 53 { "tabstops", &db_tab_stop_width, NULL }, 54 }; 55 static struct db_variable *db_evars = 56 db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 57 58 static int 59 db_find_variable(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(db_expr_t *valuep) 85 { 86 struct db_variable *vp; 87 88 if (!db_find_variable(&vp)) 89 return (0); 90 91 db_read_variable(vp, valuep); 92 93 return (1); 94 } 95 96 #ifdef notused 97 static int 98 db_set_variable(db_expr_t value) 99 { 100 struct db_variable *vp; 101 102 if (!db_find_variable(&vp)) 103 return (0); 104 105 db_write_variable(vp, &value); 106 107 return (1); 108 } 109 #endif 110 111 void 112 db_read_variable(struct db_variable *vp, db_expr_t *valuep) 113 { 114 db_varfcn_t *func = vp->fcn; 115 116 if (func == NULL) 117 *valuep = *(vp->valuep); 118 else 119 (*func)(vp, valuep, DB_VAR_GET); 120 } 121 122 static void 123 db_write_variable(struct db_variable *vp, db_expr_t *valuep) 124 { 125 db_varfcn_t *func = vp->fcn; 126 127 if (func == NULL) 128 *(vp->valuep) = *valuep; 129 else 130 (*func)(vp, valuep, DB_VAR_SET); 131 } 132 133 void 134 db_set_cmd(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4) 135 { 136 db_expr_t value; 137 struct db_variable *vp; 138 int t; 139 140 t = db_read_token(); 141 if (t != tDOLLAR) { 142 db_error("Unknown variable\n"); 143 return; 144 } 145 if (!db_find_variable(&vp)) { 146 db_error("Unknown variable\n"); 147 return; 148 } 149 150 t = db_read_token(); 151 if (t != tEQ) 152 db_unread_token(t); 153 154 if (!db_expression(&value)) { 155 db_error("No value\n"); 156 return; 157 } 158 if (db_read_token() != tEOL) { 159 db_error("?\n"); 160 } 161 162 db_write_variable(vp, &value); 163 } 164