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PsL Monthly 1993 December
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PSL Monthly Shareware CD-ROM (December 1993).iso
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prgmming
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c
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stdlib1.exe
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DIFFSET.ASM
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Assembly Source File
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1990-07-21
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731b
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48 lines
stdlib segment para public 'slcode'
assume cs:stdlib
;
;
; difference- Computes the difference of one set with another.
;
; inputs:
;
; ES:DI- Points at the destination set (at its mask byte).
; DX:SI- Points at the mask byte of the source set.
;
;
;
public sl_difference
;
sl_difference proc far
push ds
push ax
push cx
push si
push di
mov ds, dx
;
mov al, es:[di] ;Get mask bytes
not al
mov ah, [si]
add si, 8 ;Skip to start of set
add di, 8
mov cx, 256
DifLp: test ah, [si]
jz Next
and es:[di], al
Next: inc si
inc di
loop DifLp
;
pop di
pop si
pop cx
pop ax
pop ds
ret
sl_difference endp
;
;
stdlib ends
end