sys/ddb/db_write_cmd.c

   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  * $FreeBSD: src/sys/ddb/db_write_cmd.c,v 1.13 1999/08/28 00:41:12 peter Exp $
  27  * $DragonFly: src/sys/ddb/db_write_cmd.c,v 1.4 2005/12/23 21:35:44 swildner Exp $
  28  */
  29
  30 /*
  31  *      Author: David B. Golub,  Carnegie Mellon University
  32  *      Date:   7/90
  33  */
  34
  35 #include <sys/param.h>
  36
  37 #include <ddb/ddb.h>
  38 #include <ddb/db_access.h>
  39 #include <ddb/db_command.h>
  40 #include <ddb/db_sym.h>
  41
  42 /*
  43  * Write to file.
  44  */
  45 /*ARGSUSED*/
  46 void
  47 db_write_cmd(db_expr_t address, boolean_t have_addr, db_expr_t count,
  48              char *modif)
  49 {
  50         db_addr_t       addr;
  51         db_expr_t       old_value;
  52         db_expr_t       new_value;
  53         int     size;
  54         boolean_t       wrote_one = FALSE;
  55
  56         addr = (db_addr_t) address;
  57
  58         switch (modif[0]) {
  59             case 'b':
  60                 size = 1;
  61                 break;
  62             case 'h':
  63                 size = 2;
  64                 break;
  65             case 'l':
  66             case '\0':
  67                 size = 4;
  68                 break;
  69             default:
  70                 db_error("Unknown size\n");
  71                 return;
  72         }
  73
  74         while (db_expression(&new_value)) {
  75             old_value = db_get_value(addr, size, FALSE);
  76             db_printsym(addr, DB_STGY_ANY);
  77             db_printf("\t\t%#8lr\t=\t%#8lr\n", (long)old_value,(long)new_value);
  78             db_put_value(addr, size, new_value);
  79             addr += size;
  80
  81             wrote_one = TRUE;
  82         }
  83
  84         if (!wrote_one)
  85             db_error("Nothing written.\n");
  86
  87         db_next = addr;
  88         db_prev = addr - size;
  89
  90         db_skip_to_eol();
  91 }
  92