db_write_cmd.c revision 26639 
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_write_cmd.c,v 1.9 1997/02/22 09:28:34 peter Exp $
27 */
28
29/*
30 *	Author: David B. Golub,  Carnegie Mellon University
31 *	Date:	7/90
32 */
33
34#include <sys/param.h>
35
36#include <ddb/ddb.h>
37#include <ddb/db_access.h>
38#include <ddb/db_command.h>
39#include <ddb/db_sym.h>
40
41/*
42 * Write to file.
43 */
44/*ARGSUSED*/
45void
46db_write_cmd(address, have_addr, count, modif)
47	db_expr_t	address;
48	boolean_t	have_addr;
49	db_expr_t	count;
50	char *		modif;
51{
52	register
53	db_addr_t	addr;
54	register
55	db_expr_t	old_value;
56	db_expr_t	new_value;
57	register int	size;
58	boolean_t	wrote_one = FALSE;
59
60	addr = (db_addr_t) address;
61
62	switch (modif[0]) {
63	    case 'b':
64		size = 1;
65		break;
66	    case 'h':
67		size = 2;
68		break;
69	    case 'l':
70	    case '\0':
71		size = 4;
72		break;
73	    default:
74		db_error("Unknown size\n");
75		return;
76	}
77
78	while (db_expression(&new_value)) {
79	    old_value = db_get_value(addr, size, FALSE);
80	    db_printsym(addr, DB_STGY_ANY);
81	    db_printf("\t\t%#8n\t=\t%#8n\n", old_value, new_value);
82	    db_put_value(addr, size, new_value);
83	    addr += size;
84
85	    wrote_one = TRUE;
86	}
87
88	if (!wrote_one)
89	    db_error("Nothing written.\n");
90
91	db_next = addr;
92	db_prev = addr - size;
93
94	db_skip_to_eol();
95}
96
97