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  * $FreeBSD: src/sys/ddb/db_write_cmd.c,v 1.7.4.1 1999/09/05 08:08:56 peter Exp $
   27  */
   28 
   29 /*
   30  *      Author: David B. Golub,  Carnegie Mellon University
   31  *      Date:   7/90
   32  */
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 
   37 #include <ddb/ddb.h>
   38 #include <ddb/db_lex.h>
   39 #include <ddb/db_access.h>
   40 #include <ddb/db_command.h>
   41 #include <ddb/db_sym.h>
   42 
   43 /*
   44  * Write to file.
   45  */
   46 /*ARGSUSED*/
   47 void
   48 db_write_cmd(address, have_addr, count, modif)
   49         db_expr_t       address;
   50         boolean_t       have_addr;
   51         db_expr_t       count;
   52         char *          modif;
   53 {
   54         register
   55         db_addr_t       addr;
   56         register
   57         db_expr_t       old_value;
   58         db_expr_t       new_value;
   59         register int    size;
   60         boolean_t       wrote_one = FALSE;
   61 
   62         addr = (db_addr_t) address;
   63 
   64         switch (modif[0]) {
   65             case 'b':
   66                 size = 1;
   67                 break;
   68             case 'h':
   69                 size = 2;
   70                 break;
   71             case 'l':
   72             case '\0':
   73                 size = 4;
   74                 break;
   75             default:
   76                 db_error("Unknown size\n");
   77                 return;
   78         }
   79 
   80         while (db_expression(&new_value)) {
   81             old_value = db_get_value(addr, size, FALSE);
   82             db_printsym(addr, DB_STGY_ANY);
   83             db_printf("\t\t%#8n\t=\t%#8n\n", old_value, new_value);
   84             db_put_value(addr, size, new_value);
   85             addr += size;
   86 
   87             wrote_one = TRUE;
   88         }
   89 
   90         if (!wrote_one)
   91             db_error("Nothing written.\n");
   92 
   93         db_next = addr;
   94         db_prev = addr - size;
   95 
   96         db_skip_to_eol();
   97 }
   98 

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