db_write_cmd.c

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    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

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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_write_cmd.c

FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_write_cmd.c