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汇编源码--drivesex

51自学网 2015-09-08 http://www.51zixue.net
; DRIVESEX.ASM - Drive existence detection      July 6th, 1994; Code by       : Lee Hamel (hamell@cs.pdx.edu); Partial credit: Paul Schlyter;; Goes through drives A-Z and determines if they:; 1) Exist; 2) Are removable or fixed; 3) Are local, remote, or shared; 4) Are a floppy, hard, RAM, subst, or CD-ROM drive;; Callable from C as: void Drives_Exist(void);.model small.286DRIVEEXIST      EQU     1REMOVEDRV       EQU     0FIXEDDRV        EQU     1LOCALDRV        EQU     0REMOTEDRV       EQU     1SHAREDRV        EQU     2FLOPPY          EQU     0HARD            EQU     1RAM             EQU     2SUBST           EQU     3CDROM           EQU     4.dataPUBLIC  _drives        _drives         db      26 dup(0,1,0,1)        ; default to not exist, fixed, local, hard drive.code                        PUBLIC  _Drives_Exist_Drives_Exist           PROC    NEAR                pusha                push    es                mov     ah,19h                int     21h             ; get start drive                push    ax              ; save start drive                mov     ax,40h                mov     es,ax                mov     bh,es:[10h]     ; 40:10h is # of floppies-1                shr     bh,6                inc     bh              ; # of actual floppy drives                mov     bl,1                mov     di,offset _drivesnextchkfloppy:  mov     ax,4409h        ; check if drive exists                int     21h                jc      nextsetfloppy                test    dh,10000000b    ; check if SUBST drive                jz      chkfloppy                dec     bh              ; dec actual drive count                mov     byte ptr [di+3],SUBSTsetfloppyexist: mov     byte ptr [di],DRIVEEXIST                jmp     nextsetfloppychkfloppy:      dec     bh              ; dec actual drive count                js      nextsetfloppy                mov     byte ptr [di+1],REMOVEDRV                mov     byte ptr [di+3],FLOPPY                jmp     setfloppyexistnextsetfloppy:  add     di,4                inc     bl                cmp     bl,2            ; if B then jump back                je      nextchkfloppy                mov     ch,24           ; loop 24 times (drives C - Z)                mov     cl,3            ; start at C:drivechkloop:   mov     ax,4409h        ; check if drive exists                mov     bl,cl           ; set drive letter                int     21h             ; 0 = default, 1 = A:, etc.                jc      nextsetdrv                mov     byte ptr [di],DRIVEEXIST                mov     ax,4408h        ; check if removable                int     21h                mov     byte ptr [di+1],al      ; set REMOVABLE or FIXED                mov     bx,dx                mov     dl,dh                shr     dl,7                and     dh,00010000b                shr     dh,4                mov     byte ptr [di+2],dh      ; set REMOTE or LOCAL                or      dl,dl                   ; if not SUBST, then jump                jz      chkremote                mov     byte ptr [di+3],SUBST                jmp     nextsetdrvchkremote:      cmp     dh,REMOTEDRV    ; if REMOTE, then check for CD ROM                je      chkcdrom                test    bh,00000010b    ; sharable?                jz      drivenoshare                mov     byte ptr [di+2],SHAREDRVdrivenoshare:   test    bl,00000010b    ; RAM drive?                jnz     nextsetdrv                mov     byte ptr [di+3],RAM                jmp     nextsetdrvchkcdrom:       push    cx                mov     ax,1500h                xor     bx,bx                int     2fh                pop     cx                or      bx,bx           ; MSCDEX driver found?                jz      nextsetdrv      ; if not, jump to next drive setup                mov     ax,150bh                dec     cl              ; 0=A:, etc.                int     2fh                inc     cl                or      ax,ax                jz      nextsetdrv      ; drive supported by MSCDEX?                mov     byte ptr [di+3],CDROMnextsetdrv:     add     di,4                inc     cl                dec     ch                jnz     drivechkloop                pop     dx                mov     ah,0eh                int     21h             ; reset start drive                pop     es                popa                ret_Drives_Exist           ENDP                        END

 

 

 
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