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ASME's Mechanical Engine…ing Toolkit 1997 December
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ASME's Mechanical Engineering Toolkit 1997 December.iso
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CI.ASM
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Assembly Source File
|
1987-04-29
|
768b
|
36 lines
; CI.ASM - No-wait keyboard input routine designed for use with
; Microsoft C programs. Function ci() returns -1 if there
; is no keyboard input ready; otherwise it returns the
; character read from the keyboard.
SMALL EQU 0
LARGE EQU 1
CODE_M equ SMALL ; Set according to code model being used
_TEXT segment para public 'CODE'
assume cs:_TEXT
public _ci
if CODE_M
_ci proc far
else
_ci proc near ; read character from keyboard
endif
mov ah,1
int 16h
jz nochar
mov ah,0
int 16h
or al,al
jz _ci1 ; if extended code
xor ah,ah ; if not, zero high byte
_ci1: ret
nochar: mov ax,0ffffh
ret
_ci endp
_TEXT ends
end