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db_write_cmd.c revision 1.3 
      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 (at) 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  *	Author: David B. Golub,  Carnegie Mellon University
     27  *	Date:	7/90
     28  *	$Id: db_write_cmd.c,v 1.3 1993/12/18 04:46:44 mycroft Exp $
     29  */
     30 
     31 #include <sys/param.h>
     32 #include <sys/proc.h>
     33 
     34 #include <machine/db_machdep.h>
     35 
     36 #include <ddb/db_lex.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*/
     45 void
     46 db_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