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 /*
  27  *      Author: David B. Golub,  Carnegie Mellon University
  28  *      Date:   7/90
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <sys/param.h>
  35
  36 #include <ddb/ddb.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%#8lr\t=\t%#8lr\n", (long)old_value,(long)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