fdisk.c

windows自带fdisk磁盘分区工具 纯c+汇编实现

;/*
; *                      Microsoft Confidential
; *                      Copyright (C) Microsoft Corporation 1983 - 1991
; *                      All Rights Reserved.
; */
/******************************************************************************
*
*  Change Log:
*
*    Date    Who   #                      Description
*  --------  ---  ---  ------------------------------------------------------
*  03/08/90  EGH  C00  Cleaned up build by removing unused variables, declaring
*                      functions properly, changing long JMPs to short JMPs,
*                      etc.
*  05/22/90  EGH  C17  Don't display message "Press ESC to return to FDISK
*                      options" if it is immediately going to be overwritten
*                      by "Press ESC to continue".
*  05/24/90  EGH  C20  Problem fixed - a second reboot screen was added that
*                      does not instruct the user to insert a bootable DOS
*                      diskette.
*  06/19/90  EGH  C21  Added a prompt for the volume label when deleting a
*                      primary DOS partition to be consistent with deleting
*                      logical DOS drives.
*  10/19/90  EGH  C32  Added code to handle multiple primary DOS partitions.
*
******************************************************************************/

/*  */



/******************* START OF SPECIFICATIONS *******************/
/*                                                             */
/* SOURCE FILE NAME: FDISK                                     */
/*                                                             */
/* DESCRIPTIVE NAME: FIXED DISK PARTITIONING UTILITY           */
/*                                                             */
/* FUNCTION:                                                   */
/*     Allows creation and deletion of DOS related partitions  */
/*     on fixed disk devices 80-81h (int 13h BIOS defined,     */
/*     DOS). Also allows display of all partitions, and will   */
/*     allow a partition to be marked active (bootable). The   */
/*     user will be prompted for action thru a full screen     */
/*     interface. The user can also create, delete and display */
/*     logical DOS drives within a EXTENDED DOS Partition. If a*/
/*     regular DOS partition is created, the beginning of the  */
/*     partition will be scanned to insure a contiguous area of*/
/*     good sectors on the disk large enough to satisfy the    */
/*     DOS system requirements. If a bad spot is found, the    */
/*     start of the partition will be moved out until a good   */
/*     area is located                                         */
/*                                                             */
/* NOTES: The program will work by setting up a logical image  */
/*        of all relevant disk information at initilization    */
/*        time. All operations will be performed on this       */
/*        logical image, thus reducing disk accesses to only   */
/*        those required to initially set up the logical image,*/
/*        and to write the changed information at the end. The */
/*        user will be informed if there is a problem writing  */
/*        the logical image back to the disk.                  */
/*                                                             */
/*        FDISK will interface with the partition table in the */
/*        master boot record as defined in the PC-DOS technical*/
/*        reference manual. It will also create and manage the */
/*        EXTENDED DOS partition architecture as defined in the*/
/*        PC-DOS 3.30 functional spec (CP/DOS spec dcr pending)*/
/*                                                             */
/* ENTRY POINTS: MAIN                                          */
/*    LINKAGE: [d:] [path] FDISK                               */
/*                                                             */
/* EXTERNAL REFERENCES:                                        */
/*              Fixed Disk Master Boot Record                  */
/*              EXTENDED Partition Volume Boot Records         */
/*   Note: Both of the above are physical data structures on   */
/*         the surface of the disk                             */
/*                                                             */
/* P.S. - To whoever winds up maintaining this, I will         */
/*        apoligize in advance. I had just learned 'C' when    */
/*        writing this, so out of ignorance of the finer points*/
/*        of the langauge I did a lot of things by brute force.*/
/*        Hope this doesn't mess you up too much - MT 5/20/86  */
/******************** END OF SPECIFICATIONS ********************/

#include <dos.h>
#include <fdisk.h>
#include <subtype.h>
#include <extern.h>
#include <doscall.h>
#include <ctype.h>
#include <string.h>                                                     /* AN000 */
#include <fdiskmsg.h>                                                   /* AN000 */
#include "msgret.h"                                                     /* AN000 */
#include <process.h>                                                    /* AN000 */
#include <stdio.h>                                                      /* AN000 */

/*  */
/**************************************************************************/
/*                                                                        */
/*   UTILITY NAME:         FDISK.com                                      */
/*   SOURCE FILE NAME:     FDISK.c                                        */
/*   STATUS:               FDISK utility, DOS 3.3                         */
/*   CHANGE HISTORY:       UPDATED        5-29-87     DOS4.0       DRM    */
/*   SYNTAX (Command line)                                                */
/*                                                                        */
/*         [d:][path]FDISK                                                */
/*                                                                        */
/*         or                                                             */
/*                                                                        */
/*         [d:][path]FDISK  d  [/PRI:m  |  /EXT:n  |  /LOG:o ...]         */
/*                                                                        */
/*         d:      Drive to load FDISK utility from                       */
/*                                                                        */
/*         path    path to the directory on specified drive to            */
/*                 load FDISK from                                        */
/*                                                                        */
/*         d       Drive (1 or 2) that FDISK should operate on            */
/*                                                                        */
/*         /PRI:m  Size of Primary DOS partition to create in K           */
/*                                                                        */
/*         /EXT:n  Size of Extended DOS partition to create in K          */
/*                                                                        */
/*         /LOG:o  Size of Logical drive to create in K in the            */
/*                 extended partition                                     */
/*                                                                        */
/*   UTILITY FUNCTION:                                                    */
/*     Allows you to create, set up, display, and delete the              */
/*     DOS partitions on a fixed disk.                                    */
/*                                                                        */
/**************************************************************************/

/*  */
/******************* START OF SPECIFICATIONS *******************/
/*                                                             */
/* SUBROUTINE NAME: CHANGE_ACTIVE_PARTITION                    */
/*                                                             */
/* DESCRIPTIVE NAME: Change bootable partition                 */
/*                                                             */
/* FUNCTION: Will allow user to select the partition that will */
/*           recieve control when system is IPL'd. This is     */
/*           only for the first hardfile as far as booting is  */
/*           concerned, although partitions can be set active  */
/*           the second. There are reserved partitions that may*/
/*           not be set active and this routine will enforce   */
/*           that.                                             */
/*                                                             */
/* NOTES: If no valid partition is specified, then the active  */
/*        partition setting is left unchanged. Screen can be   */
/*        exited via the ESC command before active partition   */
/*        is changed and no action will take place             */
/*                                                             */
/*        The following screen is managed                      */
/*                                                             */
/*