471 lines
13 KiB
NASM
471 lines
13 KiB
NASM
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;***************************************
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;* MS-DOS Utilities *
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;* *
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;* (C) Copyright 1984,1985 by Texas *
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;* Instruments Incorporated. *
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;* All rights reserved. *
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;* *
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;* Date Written: 21 June 1984 *
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;* Last Modification: 9 June 1986 *
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;***************************************
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MSDOS equ 021h ; MS-DOS interrupt number
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GETTIME equ 02Ch ; "get_time" function request id
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READ equ 0
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WRITE equ 1
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SELDISK equ 0EH ; select disk
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CURDISK equ 019H ; get the current disk
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SETADDR equ 01AH ; set disk transfer address
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CHNGDIR equ 03BH ; change the current directory
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CRFILE equ 03CH ; create a file
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OPENFILE equ 03DH ; open a file
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CLFILE equ 03EH ; close a file
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RFILE equ 03FH ; read from a file
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WFILE equ 040H ; write to a file
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DELFILE equ 041H ; delete a file function request id
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MOVPTR equ 042H ; move file pointer
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CURRDIR equ 047H ; return text of current directory
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FINDFILE equ 04EH ; find match file
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FINDNEXT equ 04FH ; step through a directory, matching files
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CHGNAME equ 056H ; move a directory entry
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DGROUP group data
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data segment word public 'DATA'
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assume DS:DGROUP
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curdrv db 0
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db 3AH ; ':'
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db 5CH ; '\'
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curdir db 64 dup (0)
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dta db 43 dup (0)
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filespec db 13 dup (0)
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data ends
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XGROUP group progx
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progx segment byte public 'PROGX'
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assume CS:XGROUP,DS:DGROUP
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;;;
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;;; Delete a file
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;;;
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del_arg struc
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dw ? ; caller's BP
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dd ? ; return address (long)
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dw ? ; original return address (short)
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filename dw ? ; file name
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del_arg ends
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dos%del proc far
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push BP
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mov BP,SP
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mov DX,[BP].filename ; DX points to ASCIZ pathname
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mov AH,DELFILE ; delete a file
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int MSDOS
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jc del_ret
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xor AX,AX ; carry not set, return zero
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del_ret: pop BP
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ret
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dos%del endp
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;;;
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;;; Copy a file
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;;;
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copy_arg struc
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handle1 dw ? ; source file handle
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handle2 dw ? ; destination file handle
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copy_buf db 128 dup (0) ; temporary buffer for copy
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copy_BP dw ? ; caller's BP
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dd ? ; return address
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dw ? ; original return address
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file1 dw ? ; source file name
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file2 dw ? ; destination file name
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copy_arg ends
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dos%copy proc far
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push BP
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sub SP,offset copy_BP ; allocate local storage
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mov BP,SP
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mov DX,[BP].file1
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mov AH,OPENFILE ; open a file (source)
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mov AL,READ ; access mode: read
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int MSDOS
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jc copy_ret ; carry set, return
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mov [BP].handle1,AX
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mov DX,[BP].file2
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mov CX,0 ; file attribute
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mov AH,CRFILE ; create a file (destination)
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int MSDOS
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jc copy_ret
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mov [BP].handle2,AX
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; copy bytes from source file to destination file
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copy_01: lea DX,[BP].copy_buf
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mov CX,128
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mov BX,[BP].handle1
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mov AH,RFILE ; read from file
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int MSDOS
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cmp AX,0 ; end of file?
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je copy_10 ; yes, jump
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mov CX,AX ; number of bytes to move
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lea DX,[BP].copy_buf
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mov BX,[BP].handle2
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mov AH,WFILE ; write to a file
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int MSDOS
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jmp copy_01
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; close source file and destination file
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copy_10: mov BX,[BP].handle1
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mov AH,CLFILE ; close a file
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int MSDOS
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mov BX,[BP].handle2
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mov AH,CLFILE ; close a file
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int MSDOS
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xor AX,AX
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copy_ret: add SP,offset copy_BP ; release local storage
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pop BP
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ret
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dos%copy endp
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;;;
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;;; Rename files under current directory
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;;;
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ren%mov proc near
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cmp byte ptr [DI],2ah ; an '*'
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je renmv1
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cmp byte ptr [DI],3fh ; a '?'
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je renmv1
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mov AL,byte ptr [DI] ; otherwise move in the new file char
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renmv1: mov byte ptr [BX],AL
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ret
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ren%mov endp
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ren_arg struc
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ren_BP dw ? ; caller's BP
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dd ? ; return address
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dw ? ; original return address
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oldfile dw ? ; old file name
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newfile dw ? ; new file name
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ren_arg ends
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dos%ren proc far
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push BP
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mov BP,SP
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mov DX,offset DGROUP:dta
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mov AH,SETADDR ; set disk transfer address
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int MSDOS
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mov DX,[BP].oldfile
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mov CX,0 ; search attribute
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mov AH,FINDFILE ; find match file
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int MSDOS
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jc ren_ret
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ren_01: mov SI,offset DGROUP:dta
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add SI,29 ; points to filespec
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mov DI,[BP].newfile
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mov BX,offset DGROUP:filespec
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ren_02: inc SI
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cmp byte ptr ES:[SI],00h ; end of the string
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je ren_03
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cmp byte ptr ES:[SI],2eh ; an '.'?
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je ren_03
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mov AL,byte ptr ES:[SI]
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call ren%mov
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inc DI
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inc BX
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cmp byte ptr [DI-1],2ah
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jne ren_02
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cmp byte ptr [SI+1],2eh ;next char a '.'?
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je ren_02
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dec DI
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jmp ren_02
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;
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ren_03:
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cmp byte ptr [DI],00h ; end of the string
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je ren_04
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cmp byte ptr [DI],3fh ; a '?'
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je ren_04
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cmp byte ptr [DI],2ah ; an '*'
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je ren_04
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cmp byte ptr [DI-1],2eh ; previous character a '.'?
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je ren_02
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mov AL,byte ptr ES:[SI-1]
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call ren%mov
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inc DI
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inc BX
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jmp ren_03
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;
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; rename the file
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;
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ren_04: mov byte ptr [BX],0
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mov DI,offset DGROUP:filespec
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mov DX,offset DGROUP:dta
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add DX,30
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mov AH,CHGNAME ; move a directory entry
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int MSDOS
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mov AH,FINDNEXT ; find next match file
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int MSDOS
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jnc ren_01 ; carry not set, do next file
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ren_100: xor AX,AX
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ren_ret: pop BP
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ret
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dos%ren endp
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;;;
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;;; Get the file size
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;;;
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size_arg struc
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dw ? ; caller's BP
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dd ? ; caller's return address
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dw ?
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file dw ?
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size_arg ends
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dos%size proc far
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push BP
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mov BP,SP
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mov DX,offset DGROUP:dta
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mov AH,SETADDR ; set disk transfer address
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int MSDOS
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mov DX,[BP].file
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mov CX,0 ; search attribute
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mov AH,FINDFILE ; find match file
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int MSDOS
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jnc size_01
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xor BX,BX ; return 0 for invalid access
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xor AX,AX
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jmp size_ret
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size_01: mov DI,offset DGROUP:dta
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mov AX,word ptr [DI+28] ; high word of file size
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mov BX,word ptr [DI+26] ; low word of file size
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size_ret: pop BP
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ret
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dos%size endp
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;;;
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;;; Change the current directory
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;;;
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cd_arg struc
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cd_BP dw ? ; caller's BP
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dd ? ; caller's return address
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dw ?
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dir dw ?
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cd_arg ends
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dos%cd proc far
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push BP
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mov BP,SP
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mov AH,CURDISK ; current disk
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int MSDOS
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inc AL
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mov DL,AL ; drive number
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add AL,40H ; drive character
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mov curdrv,AL
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mov SI,offset DGROUP:curdir
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mov AH,CURRDIR ; return current directory
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int MSDOS
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mov DX,[BP].dir
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mov AH,CHNGDIR ; change the current directory
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int MSDOS
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mov AX,offset DGROUP:curdrv
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cd_ret: pop BP
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ret
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dos%cd endp
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;;;
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;;; Change the current drive
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;;;
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drv_arg struc
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dw ? ; caller's BP
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dd ? ; caller's return address
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dw ?
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drive db ?
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drv_arg ends
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dos%drv proc far
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push BP
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mov BP,SP
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mov DL,[BP].drive
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mov AH,CURDISK ; current disk
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int MSDOS
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mov [BP].drive,AL
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sub DL,41H ; get the drive number
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cmp DL,0
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jl drv_ret
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cmp DL,10 ; maximum nuber of drive?
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jg drv_ret
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mov AH,SELDISK ; select disk
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int MSDOS
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cmp DL,AL ; AL = number of drives
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jl drv_01
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mov DL,[BP].drive ; get the current disk
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mov AH,SELDISK ; select disk
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int MSDOS
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jmp drv_ret
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drv_01: xor AX,AX
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jmp drv_ret1
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drv_ret: mov AX,-1 ; error
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drv_ret1: pop BP
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ret
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dos%drv endp
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;;;
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;;; Move the file pointer right before EOF character and overwrite it
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;;; to fix the bug in open-extend-file
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;;;
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mov_arg struc
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m_buffer dw 0
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mov_BP dw ? ; caller's BP
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dd ? ; caller's return address
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dw ?
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fhandle dw ? ; file handle
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mov_arg ends
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mov%fptr proc far
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push BP
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sub SP,offset mov_BP ; allocate for local variable
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mov BP,SP
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mov AL,2 ; move the pointer to end of file
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mov DX,-128 ; and with offset (one record size)
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mov CX,-1
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mov AH,MOVPTR
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mov BX,[BP].fhandle ; file handle
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int MSDOS
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jc mov_ret
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cmp DX,0 ; small file?
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jge mov_001
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mov AL,0
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xor CX,CX
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xor DX,DX
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mov AH,MOVPTR
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int MSDOS
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jc mov_ret
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mov_001: lea DX,[BP].m_buffer ; address of buffer
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mov_01: mov CX,1 ; read one character at a time
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mov AH,RFILE ; read it
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int MSDOS
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jc mov_ret
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mov CL,byte ptr [BP].m_buffer
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cmp CL,1AH ; reach eof character?
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je mov_05 ; yes, go overwrite it
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cmp AX,0 ; at eof, but no eof char?
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je mov_ret ; Yes, return
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jmp short mov_01 ; No, loop
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; file pointer right after the EOF character
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mov_05: mov AL,1 ; move the pointer to the current
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mov DX,-1 ; location plus offset
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mov CX,-1
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mov AH,MOVPTR
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int MSDOS
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jc mov_ret
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; file pointer points to EOF character
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mov CX,1 ; write one byte
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mov BX,[BP].fhandle ; file handle
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mov [BP].m_buffer,0
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lea DX,[BP].m_buffer ; address of buffer
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mov AH,WFILE ; write it
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int MSDOS
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jc mov_ret
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mov AL,1 ; move the pointer to the current
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mov DX,-1 ; location plus offset
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mov CX,DX
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mov AH,MOVPTR
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mov BX,[BP].fhandle ; file handle
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int MSDOS
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jc mov_ret
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xor AX,AX
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mov_ret: add SP,offset mov_BP ; release local storage
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pop BP
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ret
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mov%fptr endp
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progx ends
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PGROUP group prog
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prog segment byte public 'PROG'
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assume CS:PGROUP
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get_args struc
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dw ? ; caller's BP
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dw ? ; return address
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get_ary dw ? ; pointer to result array
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get_args ends
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time_fmt struc ; format of data returned by get_time()
|
|||
|
|
tim_hour dw ? ; hour
|
|||
|
|
tim_min dw ? ; minute
|
|||
|
|
tim_sec dw ? ; seconds
|
|||
|
|
tim_hnds dw ? ; hundredths
|
|||
|
|
time_fmt ends
|
|||
|
|
|
|||
|
|
public get_time
|
|||
|
|
get_time proc near
|
|||
|
|
push BP ; save caller's BP
|
|||
|
|
mov BP,SP ; establish operand addressability
|
|||
|
|
|
|||
|
|
mov AH,GETTIME ; load "get_time" service call id
|
|||
|
|
int MSDOS ; request service from MS-DOS
|
|||
|
|
mov BX,[BP].get_ary ; load pointer to result array
|
|||
|
|
xor AX,AX ; clear AX
|
|||
|
|
mov AL,CH ; copy hours
|
|||
|
|
mov [BX].tim_hour,AX ; and store into result array
|
|||
|
|
mov AL,CL ; copy minutes
|
|||
|
|
mov [BX].tim_min,AX ; and store into result array
|
|||
|
|
mov AL,DH ; copy seconds
|
|||
|
|
mov [BX].tim_sec,AX ; and store into result array
|
|||
|
|
mov AL,DL ; copy hundredths
|
|||
|
|
mov [BX].tim_hnds,AX ; and store into result array
|
|||
|
|
|
|||
|
|
pop BP
|
|||
|
|
ret
|
|||
|
|
get_time endp
|
|||
|
|
;*************************************************************************
|
|||
|
|
; Link to Delete a file support
|
|||
|
|
;*************************************************************************
|
|||
|
|
public delete
|
|||
|
|
delete proc near
|
|||
|
|
call dos%del
|
|||
|
|
ret
|
|||
|
|
delete endp
|
|||
|
|
;*************************************************************************
|
|||
|
|
; Link to Copy a file support
|
|||
|
|
;*************************************************************************
|
|||
|
|
public copy_fil
|
|||
|
|
copy_fil proc near
|
|||
|
|
call dos%copy
|
|||
|
|
ret
|
|||
|
|
copy_fil endp
|
|||
|
|
;*************************************************************************
|
|||
|
|
; Link to Rename a file support
|
|||
|
|
;*************************************************************************
|
|||
|
|
public rename
|
|||
|
|
rename proc near
|
|||
|
|
call dos%ren
|
|||
|
|
ret
|
|||
|
|
rename endp
|
|||
|
|
;*************************************************************************
|
|||
|
|
; Link to file size support
|
|||
|
|
;*************************************************************************
|
|||
|
|
public filesize
|
|||
|
|
filesize proc near
|
|||
|
|
call dos%size
|
|||
|
|
ret
|
|||
|
|
filesize endp
|
|||
|
|
;*************************************************************************
|
|||
|
|
; Link to Change directory support
|
|||
|
|
;*************************************************************************
|
|||
|
|
public chgdir
|
|||
|
|
chgdir proc near
|
|||
|
|
call dos%cd
|
|||
|
|
ret
|
|||
|
|
chgdir endp
|
|||
|
|
;*************************************************************************
|
|||
|
|
; Link to Change drive support
|
|||
|
|
;*************************************************************************
|
|||
|
|
public chgdrv
|
|||
|
|
chgdrv proc near
|
|||
|
|
call dos%drv
|
|||
|
|
ret
|
|||
|
|
chgdrv endp
|
|||
|
|
;
|
|||
|
|
public mov_fptr
|
|||
|
|
mov_fptr proc near
|
|||
|
|
call mov%fptr
|
|||
|
|
ret
|
|||
|
|
mov_fptr endp
|
|||
|
|
|
|||
|
|
|
|||
|
|
prog ends
|
|||
|
|
end
|
|||
|
|
|