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 1.4 1993/08/02 17:53:15 mycroft Exp $ 27 */ 28 29 #include "param.h" 30 #include "proc.h" 31 #include <machine/db_machdep.h> 32 33 #include <ddb/db_lex.h> 34 #include <ddb/db_variables.h> 35 36 extern unsigned int db_maxoff; 37 38 extern int db_radix; 39 extern int db_max_width; 40 extern int db_tab_stop_width; 41 extern int db_max_line; 42 43 struct db_variable db_vars[] = { 44 { "radix", &db_radix, FCN_NULL }, 45 { "maxoff", (int *)&db_maxoff, FCN_NULL }, 46 { "maxwidth", &db_max_width, FCN_NULL }, 47 { "tabstops", &db_tab_stop_width, FCN_NULL }, 48 { "lines", &db_max_line, FCN_NULL }, 49 }; 50 struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 51 52 int 53 db_find_variable(varp) 54 struct db_variable **varp; 55 { 56 int t; 57 struct db_variable *vp; 58 59 t = db_read_token(); 60 if (t == tIDENT) { 61 for (vp = db_vars; vp < db_evars; vp++) { 62 if (!strcmp(db_tok_string, vp->name)) { 63 *varp = vp; 64 return (1); 65 } 66 } 67 for (vp = db_regs; vp < db_eregs; vp++) { 68 if (!strcmp(db_tok_string, vp->name)) { 69 *varp = vp; 70 return (1); 71 } 72 } 73 } 74 db_error("Unknown variable\n"); 75 return (0); 76 } 77 78 int 79 db_get_variable(valuep) 80 db_expr_t *valuep; 81 { 82 struct db_variable *vp; 83 84 if (!db_find_variable(&vp)) 85 return (0); 86 87 db_read_variable(vp, valuep); 88 89 return (1); 90 } 91 92 int 93 db_set_variable(value) 94 db_expr_t value; 95 { 96 struct db_variable *vp; 97 98 if (!db_find_variable(&vp)) 99 return (0); 100 101 db_write_variable(vp, &value); 102 103 return (1); 104 } 105 106 107 db_read_variable(vp, valuep) 108 struct db_variable *vp; 109 db_expr_t *valuep; 110 { 111 int (*func)() = vp->fcn; 112 113 if (func == FCN_NULL) 114 *valuep = *(vp->valuep); 115 else 116 (*func)(vp, valuep, DB_VAR_GET); 117 } 118 119 db_write_variable(vp, valuep) 120 struct db_variable *vp; 121 db_expr_t *valuep; 122 { 123 int (*func)() = vp->fcn; 124 125 if (func == FCN_NULL) 126 *(vp->valuep) = *valuep; 127 else 128 (*func)(vp, valuep, DB_VAR_SET); 129 } 130 131 void 132 db_set_cmd() 133 { 134 db_expr_t value; 135 int (*func)(); 136 struct db_variable *vp; 137 int t; 138 139 t = db_read_token(); 140 if (t != tDOLLAR) { 141 db_error("Unknown variable\n"); 142 return; 143 } 144 if (!db_find_variable(&vp)) { 145 db_error("Unknown variable\n"); 146 return; 147 } 148 149 t = db_read_token(); 150 if (t != tEQ) 151 db_unread_token(t); 152 153 if (!db_expression(&value)) { 154 db_error("No value\n"); 155 return; 156 } 157 if (db_read_token() != tEOL) { 158 db_error("?\n"); 159 } 160 161 db_write_variable(vp, &value); 162 } 163