The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/ddb/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 /*
   27  *      Author: David B. Golub,  Carnegie Mellon University
   28  *      Date:   7/90
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: stable/9/sys/ddb/db_write_cmd.c 139747 2005-01-06 01:34:41Z imp $");
   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 

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