sys/ddb/db_write_cmd.c

/*
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 *
 *      $Id: db_write_cmd.c,v 1.2 1993/10/16 16:47:35 rgrimes Exp $
 */

/*
 *      Author: David B. Golub,  Carnegie Mellon University
 *      Date:   7/90
 */

#include "param.h"
#include "systm.h"
#include "proc.h"
#include "ddb/ddb.h"

#include <ddb/db_lex.h>
#include <ddb/db_access.h>
#include <ddb/db_command.h>
#include <ddb/db_sym.h>

/*
 * Write to file.
 */
/*ARGSUSED*/
void
db_write_cmd(address, have_addr, count, modif)
        db_expr_t       address;
        boolean_t       have_addr;
        db_expr_t       count;
        char *          modif;
{
        register
        db_addr_t       addr;
        register
        db_expr_t       old_value;
        db_expr_t       new_value;
        register int    size;
        boolean_t       wrote_one = FALSE;

        addr = (db_addr_t) address;

        switch (modif[0]) {
            case 'b':
                size = 1;
                break;
            case 'h':
                size = 2;
                break;
            case 'l':
            case '\0':
                size = 4;
                break;
            default:
                db_error("Unknown size\n");
                return;
        }

        while (db_expression(&new_value)) {
            old_value = db_get_value(addr, size, FALSE);
            db_printsym(addr, DB_STGY_ANY);
            db_printf("\t\t%#8n\t=\t%#8n\n", old_value, new_value);
            db_put_value(addr, size, new_value);
            addr += size;

            wrote_one = TRUE;
        }

        if (!wrote_one)
            db_error("Nothing written.\n");

        db_next = addr;
        db_prev = addr - size;

        db_skip_to_eol();
}