db_write_cmd.c revision 8876 
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 1.4 1994/08/13 03:49:26 wollman Exp $
27 */
28
29/*
30 *	Author: David B. Golub,  Carnegie Mellon University
31 *	Date:	7/90
32 */
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/proc.h>
37#include <ddb/ddb.h>
38
39#include <ddb/db_lex.h>
40#include <ddb/db_access.h>
41#include <ddb/db_command.h>
42#include <ddb/db_sym.h>
43
44/*
45 * Write to file.
46 */
47/*ARGSUSED*/
48void
49db_write_cmd(address, have_addr, count, modif)
50	db_expr_t	address;
51	boolean_t	have_addr;
52	db_expr_t	count;
53	char *		modif;
54{
55	register
56	db_addr_t	addr;
57	register
58	db_expr_t	old_value;
59	db_expr_t	new_value;
60	register int	size;
61	boolean_t	wrote_one = FALSE;
62
63	addr = (db_addr_t) address;
64
65	switch (modif[0]) {
66	    case 'b':
67		size = 1;
68		break;
69	    case 'h':
70		size = 2;
71		break;
72	    case 'l':
73	    case '\0':
74		size = 4;
75		break;
76	    default:
77		db_error("Unknown size\n");
78		return;
79	}
80
81	while (db_expression(&new_value)) {
82	    old_value = db_get_value(addr, size, FALSE);
83	    db_printsym(addr, DB_STGY_ANY);
84	    db_printf("\t\t%#8n\t=\t%#8n\n", old_value, new_value);
85	    db_put_value(addr, size, new_value);
86	    addr += size;
87
88	    wrote_one = TRUE;
89	}
90
91	if (!wrote_one)
92	    db_error("Nothing written.\n");
93
94	db_next = addr;
95	db_prev = addr - size;
96
97	db_skip_to_eol();
98}
99
100