| | 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 | * $FreeBSD: src/sys/ddb/db_variables.c,v 1.18 1999/08/28 00:41:11 peter Exp $ |
| | 27 | * $DragonFly: src/sys/ddb/db_variables.c,v 1.2 2003/06/17 04:28:20 dillon Exp $ |
| | 28 | */ |
| | 29 | |
| | 30 | /* |
| | 31 | * Author: David B. Golub, Carnegie Mellon University |
| | 32 | * Date: 7/90 |
| | 33 | */ |
| | 34 | |
| | 35 | #include <sys/param.h> |
| | 36 | #include <sys/systm.h> |
| | 37 | |
| | 38 | #include <ddb/ddb.h> |
| | 39 | #include <ddb/db_lex.h> |
| | 40 | #include <ddb/db_variables.h> |
| | 41 | |
| | 42 | static int db_find_variable __P((struct db_variable **varp)); |
| | 43 | static void db_write_variable __P((struct db_variable *, db_expr_t *)); |
| | 44 | |
| | 45 | #ifdef notused |
| | 46 | static int db_set_variable __P((db_expr_t value)); |
| | 47 | #endif |
| | 48 | |
| | 49 | static struct db_variable db_vars[] = { |
| | 50 | { "radix", &db_radix, FCN_NULL }, |
| | 51 | { "maxoff", &db_maxoff, FCN_NULL }, |
| | 52 | { "maxwidth", &db_max_width, FCN_NULL }, |
| | 53 | { "tabstops", &db_tab_stop_width, FCN_NULL }, |
| | 54 | }; |
| | 55 | static struct db_variable *db_evars = |
| | 56 | db_vars + sizeof(db_vars)/sizeof(db_vars[0]); |
| | 57 | |
| | 58 | static int |
| | 59 | db_find_variable(varp) |
| | 60 | struct db_variable **varp; |
| | 61 | { |
| | 62 | int t; |
| | 63 | struct db_variable *vp; |
| | 64 | |
| | 65 | t = db_read_token(); |
| | 66 | if (t == tIDENT) { |
| | 67 | for (vp = db_vars; vp < db_evars; vp++) { |
| | 68 | if (!strcmp(db_tok_string, vp->name)) { |
| | 69 | *varp = vp; |
| | 70 | return (1); |
| | 71 | } |
| | 72 | } |
| | 73 | for (vp = db_regs; vp < db_eregs; vp++) { |
| | 74 | if (!strcmp(db_tok_string, vp->name)) { |
| | 75 | *varp = vp; |
| | 76 | return (1); |
| | 77 | } |
| | 78 | } |
| | 79 | } |
| | 80 | db_error("Unknown variable\n"); |
| | 81 | return (0); |
| | 82 | } |
| | 83 | |
| | 84 | int |
| | 85 | db_get_variable(valuep) |
| | 86 | db_expr_t *valuep; |
| | 87 | { |
| | 88 | struct db_variable *vp; |
| | 89 | |
| | 90 | if (!db_find_variable(&vp)) |
| | 91 | return (0); |
| | 92 | |
| | 93 | db_read_variable(vp, valuep); |
| | 94 | |
| | 95 | return (1); |
| | 96 | } |
| | 97 | |
| | 98 | #ifdef notused |
| | 99 | static int |
| | 100 | db_set_variable(value) |
| | 101 | db_expr_t value; |
| | 102 | { |
| | 103 | struct db_variable *vp; |
| | 104 | |
| | 105 | if (!db_find_variable(&vp)) |
| | 106 | return (0); |
| | 107 | |
| | 108 | db_write_variable(vp, &value); |
| | 109 | |
| | 110 | return (1); |
| | 111 | } |
| | 112 | #endif |
| | 113 | |
| | 114 | void |
| | 115 | db_read_variable(vp, valuep) |
| | 116 | struct db_variable *vp; |
| | 117 | db_expr_t *valuep; |
| | 118 | { |
| | 119 | db_varfcn_t *func = vp->fcn; |
| | 120 | |
| | 121 | if (func == FCN_NULL) |
| | 122 | *valuep = *(vp->valuep); |
| | 123 | else |
| | 124 | (*func)(vp, valuep, DB_VAR_GET); |
| | 125 | } |
| | 126 | |
| | 127 | static void |
| | 128 | db_write_variable(vp, valuep) |
| | 129 | struct db_variable *vp; |
| | 130 | db_expr_t *valuep; |
| | 131 | { |
| | 132 | db_varfcn_t *func = vp->fcn; |
| | 133 | |
| | 134 | if (func == FCN_NULL) |
| | 135 | *(vp->valuep) = *valuep; |
| | 136 | else |
| | 137 | (*func)(vp, valuep, DB_VAR_SET); |
| | 138 | } |
| | 139 | |
| | 140 | void |
| | 141 | db_set_cmd(dummy1, dummy2, dummy3, dummy4) |
| | 142 | db_expr_t dummy1; |
| | 143 | boolean_t dummy2; |
| | 144 | db_expr_t dummy3; |
| | 145 | char * dummy4; |
| | 146 | { |
| | 147 | db_expr_t value; |
| | 148 | struct db_variable *vp; |
| | 149 | int t; |
| | 150 | |
| | 151 | t = db_read_token(); |
| | 152 | if (t != tDOLLAR) { |
| | 153 | db_error("Unknown variable\n"); |
| | 154 | return; |
| | 155 | } |
| | 156 | if (!db_find_variable(&vp)) { |
| | 157 | db_error("Unknown variable\n"); |
| | 158 | return; |
| | 159 | } |
| | 160 | |
| | 161 | t = db_read_token(); |
| | 162 | if (t != tEQ) |
| | 163 | db_unread_token(t); |
| | 164 | |
| | 165 | if (!db_expression(&value)) { |
| | 166 | db_error("No value\n"); |
| | 167 | return; |
| | 168 | } |
| | 169 | if (db_read_token() != tEOL) { |
| | 170 | db_error("?\n"); |
| | 171 | } |
| | 172 | |
| | 173 | db_write_variable(vp, &value); |
| | 174 | } |
projects / dragonfly.git / blame_incremental