1 /* $NetBSD: db_variables.c,v 1.7 1994/10/09 08:56:28 mycroft Exp $ */ 2 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 #include <sys/param.h> 30 #include <sys/proc.h> 31 32 #include <machine/db_machdep.h> 33 34 #include <ddb/db_lex.h> 35 #include <ddb/db_variables.h> 36 37 extern unsigned int db_maxoff; 38 39 extern int db_radix; 40 extern int db_max_width; 41 extern int db_tab_stop_width; 42 extern int db_max_line; 43 44 struct db_variable db_vars[] = { 45 { "radix", &db_radix, FCN_NULL }, 46 { "maxoff", (int *)&db_maxoff, FCN_NULL }, 47 { "maxwidth", &db_max_width, FCN_NULL }, 48 { "tabstops", &db_tab_stop_width, FCN_NULL }, 49 { "lines", &db_max_line, FCN_NULL }, 50 }; 51 struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 52 53 int 54 db_find_variable(varp) 55 struct db_variable **varp; 56 { 57 int t; 58 struct db_variable *vp; 59 60 t = db_read_token(); 61 if (t == tIDENT) { 62 for (vp = db_vars; vp < db_evars; vp++) { 63 if (!strcmp(db_tok_string, vp->name)) { 64 *varp = vp; 65 return (1); 66 } 67 } 68 for (vp = db_regs; vp < db_eregs; vp++) { 69 if (!strcmp(db_tok_string, vp->name)) { 70 *varp = vp; 71 return (1); 72 } 73 } 74 } 75 db_error("Unknown variable\n"); 76 /*NOTREACHED*/ 77 } 78 79 int 80 db_get_variable(valuep) 81 db_expr_t *valuep; 82 { 83 struct db_variable *vp; 84 85 if (!db_find_variable(&vp)) 86 return (0); 87 88 db_read_variable(vp, valuep); 89 90 return (1); 91 } 92 93 int 94 db_set_variable(value) 95 db_expr_t value; 96 { 97 struct db_variable *vp; 98 99 if (!db_find_variable(&vp)) 100 return (0); 101 102 db_write_variable(vp, &value); 103 104 return (1); 105 } 106 107 108 db_read_variable(vp, valuep) 109 struct db_variable *vp; 110 db_expr_t *valuep; 111 { 112 int (*func)() = vp->fcn; 113 114 if (func == FCN_NULL) 115 *valuep = *(vp->valuep); 116 else 117 (*func)(vp, valuep, DB_VAR_GET); 118 } 119 120 db_write_variable(vp, valuep) 121 struct db_variable *vp; 122 db_expr_t *valuep; 123 { 124 int (*func)() = vp->fcn; 125 126 if (func == FCN_NULL) 127 *(vp->valuep) = *valuep; 128 else 129 (*func)(vp, valuep, DB_VAR_SET); 130 } 131 132 void 133 db_set_cmd() 134 { 135 db_expr_t value; 136 int (*func)(); 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 /*NOTREACHED*/ 144 } 145 if (!db_find_variable(&vp)) { 146 db_error("Unknown variable\n"); 147 /*NOTREACHED*/ 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 /*NOTREACHED*/ 157 } 158 if (db_read_token() != tEOL) { 159 db_error("?\n"); 160 /*NOTREACHED*/ 161 } 162 163 db_write_variable(vp, &value); 164 } 165