1 /* $NetBSD: db_variables.c,v 1.8 1996/02/05 01:57:19 christos 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 #include <ddb/db_command.h> 37 #include <ddb/db_sym.h> 38 #include <ddb/db_extern.h> 39 40 extern unsigned int db_maxoff; 41 42 extern int db_radix; 43 extern int db_max_width; 44 extern int db_tab_stop_width; 45 extern int db_max_line; 46 47 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 { "lines", &db_max_line, FCN_NULL }, 53 }; 54 struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 55 56 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 /*NOTREACHED*/ 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 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 } 110 111 112 void 113 db_read_variable(vp, valuep) 114 struct db_variable *vp; 115 db_expr_t *valuep; 116 { 117 int (*func) __P((struct db_variable *, db_expr_t *, int)) = vp->fcn; 118 119 if (func == FCN_NULL) 120 *valuep = *(vp->valuep); 121 else 122 (*func)(vp, valuep, DB_VAR_GET); 123 } 124 125 void 126 db_write_variable(vp, valuep) 127 struct db_variable *vp; 128 db_expr_t *valuep; 129 { 130 int (*func) __P((struct db_variable *, db_expr_t *, int)) = vp->fcn; 131 132 if (func == FCN_NULL) 133 *(vp->valuep) = *valuep; 134 else 135 (*func)(vp, valuep, DB_VAR_SET); 136 } 137 138 /*ARGSUSED*/ 139 void 140 db_set_cmd(addr, have_addr, count, modif) 141 db_expr_t addr; 142 int have_addr; 143 db_expr_t count; 144 char * modif; 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 /*NOTREACHED*/ 154 } 155 if (!db_find_variable(&vp)) { 156 db_error("Unknown variable\n"); 157 /*NOTREACHED*/ 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 /*NOTREACHED*/ 167 } 168 if (db_read_token() != tEOL) { 169 db_error("?\n"); 170 /*NOTREACHED*/ 171 } 172 173 db_write_variable(vp, &value); 174 } 175