sys/ddb/db_write_cmd.c

   1 /*      $NetBSD: db_write_cmd.c,v 1.22 2007/02/22 06:41:01 thorpej 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@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/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: db_write_cmd.c,v 1.22 2007/02/22 06:41:01 thorpej Exp $");
  34
  35 #include <sys/param.h>
  36 #include <sys/proc.h>
  37
  38 #include <ddb/ddb.h>
  39
  40 /*
  41  * Write to file.
  42  */
  43 /*ARGSUSED*/
  44 void
  45 db_write_cmd(db_expr_t address, bool have_addr,
  46     db_expr_t count, const char *modif)
  47 {
  48         db_addr_t       addr;
  49         db_expr_t       old_value;
  50         db_expr_t       new_value;
  51         int             size;
  52         bool            wrote_one = false;
  53
  54         addr = (db_addr_t) address;
  55
  56         switch (modif[0]) {
  57         case 'b':
  58                 size = 1;
  59                 break;
  60         case 'h':
  61                 size = 2;
  62                 break;
  63         case 'l':
  64         case '\0':
  65                 size = 4;
  66                 break;
  67         default:
  68                 size = -1;
  69                 db_error("Unknown size\n");
  70                 /*NOTREACHED*/
  71         }
  72
  73         while (db_expression(&new_value)) {
  74                 old_value = db_get_value(addr, size, false);
  75                 db_printsym(addr, DB_STGY_ANY, db_printf);
  76                 db_printf("\t\t%s = ", db_num_to_str(old_value));
  77                 db_printf("%s\n", db_num_to_str(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                 /*NOTREACHED*/
  87         }
  88
  89         db_next = addr;
  90         db_prev = addr - size;
  91
  92         db_skip_to_eol();
  93 }