1 /* $OpenBSD: db_variables.c,v 1.14 2014/07/08 13:02:57 deraadt Exp $ */ 2 /* $NetBSD: db_variables.c,v 1.8 1996/02/05 01:57:19 christos Exp $ */ 3 4 /* 5 * Mach Operating System 6 * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University 7 * All Rights Reserved. 8 * 9 * Permission to use, copy, modify and distribute this software and its 10 * documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 17 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie Mellon 27 * the rights to redistribute these changes. 28 */ 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/proc.h> 33 34 #include <machine/db_machdep.h> 35 36 #include <ddb/db_lex.h> 37 #include <ddb/db_variables.h> 38 #include <ddb/db_command.h> 39 #include <ddb/db_sym.h> 40 #include <ddb/db_extern.h> 41 #include <ddb/db_var.h> 42 43 struct db_variable db_vars[] = { 44 { "radix", (long *)&db_radix, db_var_rw_int }, 45 { "maxoff", (long *)&db_maxoff, db_var_rw_int }, 46 { "maxwidth", (long *)&db_max_width, db_var_rw_int }, 47 { "tabstops", (long *)&db_tab_stop_width, db_var_rw_int }, 48 { "lines", (long *)&db_max_line, db_var_rw_int }, 49 { "log", (long *)&db_log, db_var_rw_int } 50 }; 51 struct db_variable *db_evars = db_vars + nitems(db_vars); 52 53 int 54 db_find_variable(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 /*NOTREACHED*/ 76 return 0; 77 } 78 79 int 80 db_get_variable(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(db_expr_t value) 94 { 95 struct db_variable *vp; 96 97 if (!db_find_variable(&vp)) 98 return (0); 99 100 db_write_variable(vp, &value); 101 102 return (1); 103 } 104 105 106 void 107 db_read_variable(struct db_variable *vp, db_expr_t *valuep) 108 { 109 int (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn; 110 111 if (func == FCN_NULL) 112 *valuep = *(vp->valuep); 113 else 114 (*func)(vp, valuep, DB_VAR_GET); 115 } 116 117 void 118 db_write_variable(struct db_variable *vp, db_expr_t *valuep) 119 { 120 int (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn; 121 122 if (func == FCN_NULL) 123 *(vp->valuep) = *valuep; 124 else 125 (*func)(vp, valuep, DB_VAR_SET); 126 } 127 128 /*ARGSUSED*/ 129 void 130 db_set_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) 131 { 132 db_expr_t value; 133 struct db_variable *vp; 134 int t; 135 136 t = db_read_token(); 137 if (t != tDOLLAR) { 138 db_error("Unknown variable\n"); 139 /*NOTREACHED*/ 140 } 141 if (!db_find_variable(&vp)) { 142 db_error("Unknown variable\n"); 143 /*NOTREACHED*/ 144 } 145 146 t = db_read_token(); 147 if (t != tEQ) 148 db_unread_token(t); 149 150 if (!db_expression(&value)) { 151 db_error("No value\n"); 152 /*NOTREACHED*/ 153 } 154 if (db_read_token() != tEOL) { 155 db_error("?\n"); 156 /*NOTREACHED*/ 157 } 158 159 db_write_variable(vp, &value); 160 } 161 162 int 163 db_var_rw_int(struct db_variable *var, db_expr_t *expr, int mode) 164 { 165 166 if (mode == DB_VAR_SET) 167 *var->valuep = *(int *)expr; 168 else 169 *expr = *(int *)var->valuep; 170 return (0); 171 } 172 173