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Collection of Tools & Utilities
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is_con10.zip
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ISCONSOL.ASM
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Assembly Source File
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1991-12-21
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650b
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31 lines
PUBLIC isconsole
IS_DEVICE EQU 0080H
IS_FASTCONSOLE EQU 0010H
IS_CONSOUT EQU 0002H
IS_CONSIN EQU 0001H
;int isconsole(int handle)
isconsole PROC NEAR
mov ax,4400H ;IOCTL svc, get device information
mov bx,sp ;parm is stack-relative
mov bx,SS:[bx+2] ;get handle
int 21H ;result in DX
mov ax,dx ;into AX for faster testing
xor dx,dx ;handy 0
test ax,IS_DEVICE
jz Ret_False ;not a device at all
test ax,IS_FASTCONSOLE
jz Ret_False
test ax,IS_CONSOUT
jz Ret_False
test ax,IS_CONSIN
jz Ret_False
not dx ;return non-0, TRUE
Ret_False:
mov ax,dx ;return function in AX
ret
isconsole ENDP