155 lines
3.6 KiB
NASM
155 lines
3.6 KiB
NASM
TITLE MORE MS-DOS Paginate Filter
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FALSE EQU 0
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TRUE EQU NOT FALSE
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IBMVER EQU TRUE
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KANJI EQU FALSE
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MSVER EQU FALSE
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INCLUDE DOSSYM.ASM
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CODE SEGMENT PUBLIC
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ORG 100H
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ASSUME CS:CODE,DS:CODE,ES:CODE,SS:CODE
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START:
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MOV AH,GET_VERSION
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INT 21H
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XCHG AH,AL ; Turn it around to AH.AL
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CMP AX,200H
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JAE OKDOS
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MOV DX,OFFSET BADVER
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MOV AH,STD_CON_STRING_OUTPUT
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INT 21H
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INT 20H
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OKDOS:
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IF IBMVER
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IF KANJI
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MOV BYTE PTR MAXROW,24
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ELSE
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MOV BYTE PTR MAXROW,25
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ENDIF
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MOV AH,15
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INT 16
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MOV MAXCOL,AH
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ENDIF
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MOV DX,OFFSET CRLFTXT ; INITIALIZE CURSOR
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MOV AH,STD_CON_STRING_OUTPUT
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INT 21H
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XOR BX,BX ; DUP FILE HANDLE 0
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MOV AH,XDUP
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INT 21H
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MOV BP,AX
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MOV AH,CLOSE ; CLOSE STANDARD IN
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INT 21H
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MOV BX,2 ; DUP STD ERR TO STANDARD IN
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MOV AH,XDUP
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INT 21H
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ALOOP:
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CLD
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MOV DX,OFFSET BUFFER
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MOV CX,4096
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MOV BX,BP
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MOV AH,READ
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INT 21H
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OR AX,AX
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JNZ SETCX
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DONE: INT 20H
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SETCX: MOV CX,AX
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MOV SI,DX
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TLOOP:
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LODSB
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CMP AL,1AH
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JZ DONE
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CMP AL,13
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JNZ NOTCR
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MOV BYTE PTR CURCOL,1
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JMP SHORT ISCNTRL
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NOTCR: CMP AL,10
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JNZ NOTLF
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INC BYTE PTR CURROW
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JMP SHORT ISCNTRL
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NOTLF: CMP AL,8
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JNZ NOTBP
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CMP BYTE PTR CURCOL,1
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JZ ISCNTRL
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DEC BYTE PTR CURCOL
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JMP SHORT ISCNTRL
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NOTBP: CMP AL,9
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JNZ NOTTB
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MOV AH,CURCOL
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ADD AH,7
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AND AH,11111000B
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INC AH
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MOV CURCOL,AH
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JMP SHORT ISCNTRL
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NOTTB:
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IF MSVER ; IBM CONTROL CHARACTER PRINT
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CMP AL,' '
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JB ISCNTRL
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ENDIF
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IF IBMVER
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CMP AL,7 ; ALL CHARACTERS PRINT BUT BELL
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JZ ISCNTRL
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ENDIF
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INC BYTE PTR CURCOL
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MOV AH,CURCOL
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CMP AH,MAXCOL
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JBE ISCNTRL
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INC BYTE PTR CURROW
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MOV BYTE PTR CURCOL,1
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ISCNTRL:
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MOV DL,AL
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MOV AH,STD_CON_OUTPUT
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INT 21H
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MOV AH,CURROW
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CMP AH,MAXROW
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JB CHARLOOP
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ASKMORE:
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MOV DX,OFFSET MORETXT
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MOV AH,STD_CON_STRING_OUTPUT
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INT 21H ; ASK MORE?
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MOV AH,STD_CON_INPUT_FLUSH ; WAIT FOR A KEY, NO ECHO
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MOV AL,STD_CON_INPUT
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INT 21H
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MOV DX,OFFSET CRLFTXT
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MOV AH,STD_CON_STRING_OUTPUT
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INT 21H
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MOV BYTE PTR CURCOL,1
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MOV BYTE PTR CURROW,1
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CHARLOOP:
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DEC CX
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JZ GOBIG
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JMP TLOOP
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GOBIG: JMP ALOOP
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MAXROW DB 24
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MAXCOL DB 80
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CURROW DB 1
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CURCOL DB 1
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EXTRN MORETXT:BYTE,BADVER:BYTE,CRLFTXT:BYTE,BUFFER:BYTE
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CODE ENDS
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END START
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