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 * $Id: db_variables.c,v 1.13 1997/02/22 09:28:31 peter Exp $ 27 */ 28 29 /* 30 * Author: David B. Golub, Carnegie Mellon University 31 * Date: 7/90 32 */ 33 34 #include <sys/param.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 __P((struct db_variable **varp)); 41 static void db_write_variable __P((struct db_variable *, db_expr_t *)); 42 43 #ifdef notused 44 static int db_set_variable __P((db_expr_t value)); 45 #endif 46 47 static struct db_variable db_vars[] = { 48 { "radix", &db_radix, FCN_NULL }, 49 { "maxoff", (int *)&db_maxoff, FCN_NULL }, 50 { "maxwidth", &db_max_width, FCN_NULL }, 51 { "tabstops", &db_tab_stop_width, FCN_NULL }, 52 }; 53 static struct db_variable *db_evars = 54 db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 55 56 static int 57 db_find_variable(varp) 58 struct db_variable **varp; 59 { 60 int t; 61 struct db_variable *vp; 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(valuep) 84 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(value) 99 db_expr_t value; 100 { 101 struct db_variable *vp; 102 103 if (!db_find_variable(&vp)) 104 return (0); 105 106 db_write_variable(vp, &value); 107 108 return (1); 109 } 110 #endif 111 112 void 113 db_read_variable(vp, valuep) 114 struct db_variable *vp; 115 db_expr_t *valuep; 116 { 117 db_varfcn_t *func = vp->fcn; 118 119 if (func == FCN_NULL) 120 *valuep = *(vp->valuep); 121 else 122 (*func)(vp, valuep, DB_VAR_GET); 123 } 124 125 static void 126 db_write_variable(vp, valuep) 127 struct db_variable *vp; 128 db_expr_t *valuep; 129 { 130 db_varfcn_t *func = vp->fcn; 131 132 if (func == FCN_NULL) 133 *(vp->valuep) = *valuep; 134 else 135 (*func)(vp, valuep, DB_VAR_SET); 136 } 137 138 void 139 db_set_cmd(dummy1, dummy2, dummy3, dummy4) 140 db_expr_t dummy1; 141 boolean_t dummy2; 142 db_expr_t dummy3; 143 char * dummy4; 144 { 145 db_expr_t value; 146 struct db_variable *vp; 147 int t; 148 149 t = db_read_token(); 150 if (t != tDOLLAR) { 151 db_error("Unknown variable\n"); 152 return; 153 } 154 if (!db_find_variable(&vp)) { 155 db_error("Unknown variable\n"); 156 return; 157 } 158 159 t = db_read_token(); 160 if (t != tEQ) 161 db_unread_token(t); 162 163 if (!db_expression(&value)) { 164 db_error("No value\n"); 165 return; 166 } 167 if (db_read_token() != tEOL) { 168 db_error("?\n"); 169 } 170 171 db_write_variable(vp, &value); 172 } 173