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db_write_cmd.c revision 1.13 
      1 /*	$NetBSD: db_write_cmd.c,v 1.13 2000/05/25 19:57:36 jhawk Exp $	*/
      2 
      3 /*
      4  * Mach Operating System
      5  * Copyright (c) 1991,1990 Carnegie Mellon University
      6  * All Rights Reserved.
      7  *
      8  * Permission to use, copy, modify and distribute this software and its
      9  * documentation is hereby granted, provided that both the copyright
     10  * notice and this permission notice appear in all copies of the
     11  * software, derivative works or modified versions, and any portions
     12  * thereof, and that both notices appear in supporting documentation.
     13  *
     14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     16  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     17  *
     18  * Carnegie Mellon requests users of this software to return to
     19  *
     20  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     21  *  School of Computer Science
     22  *  Carnegie Mellon University
     23  *  Pittsburgh PA 15213-3890
     24  *
     25  * any improvements or extensions that they make and grant Carnegie the
     26  * rights to redistribute these changes.
     27  *
     28  *	Author: David B. Golub,  Carnegie Mellon University
     29  *	Date:	7/90
     30  */
     31 
     32 #include <sys/param.h>
     33 #include <sys/proc.h>
     34 
     35 #include <machine/db_machdep.h>
     36 
     37 #include <ddb/db_lex.h>
     38 #include <ddb/db_access.h>
     39 #include <ddb/db_command.h>
     40 #include <ddb/db_sym.h>
     41 #include <ddb/db_extern.h>
     42 #include <ddb/db_output.h>
     43 
     44 /*
     45  * Write to file.
     46  */
     47 /*ARGSUSED*/
     48 void
     49 db_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 	db_addr_t	addr;
     56 	db_expr_t	old_value;
     57 	db_expr_t	new_value;
     58 	int		size;
     59 	boolean_t	wrote_one = FALSE;
     60 
     61 	addr = (db_addr_t) address;
     62 
     63 	switch (modif[0]) {
     64 	    case 'b':
     65 		size = 1;
     66 		break;
     67 	    case 'h':
     68 		size = 2;
     69 		break;
     70 	    case 'l':
     71 	    case '\0':
     72 		size = 4;
     73 		break;
     74 	    default:
     75 		size = -1;
     76 		db_error("Unknown size\n");
     77 		/*NOTREACHED*/
     78 	}
     79 
     80 	while (db_expression(&new_value)) {
     81 	    old_value = db_get_value(addr, size, FALSE);
     82 	    db_printsym(addr, DB_STGY_ANY, db_printf);
     83 	    db_printf("\t\t%#*ln = %#*ln\n", (int)(sizeof (old_value) * 2) + 2,
     84 		old_value, (int)(sizeof (new_value) * 2) + 2, 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 	    /*NOTREACHED*/
     94 	}
     95 
     96 	db_next = addr;
     97 	db_prev = addr - size;
     98 
     99 	db_skip_to_eol();
    100 }
    101 
    102