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;
page 60,132
;
title CP/DOS DOSQhandtype mapper
;
dosxxx segment byte public 'dos'
assume cs:dosxxx,ds:nothing,es:nothing,ss:nothing
;
; ************************************************************************* *
; *
; * MODULE: DosQhandtype
; *
; * FILE NAME: DosQhandtype
; *
; * FUNCTION: Determine whether a handle is file or device
; *
; * CALLING SEQUENCE:
; *
; * push handle ; file handle
; * push@ handtype ; handle type
; * push@ flagword ; device descriptor word
; * call dosqhandtype
; *
; * RETURN SEQUENCE:
; *
; * handle type: 0 - if a file
; * 1 - if a device
; * MODULES CALLED:
; *
; *
; *************************************************************************
public dosqhandtype
.sall
.xlist
include macros.inc
.list
str struc
old_bp dw ?
return dd ?
AttributePtr dd ? ; Device descriptor word returned if device
HandleTypePtr dd ? ; handle type; 0 = file handle, 1 = device handle
Handle dw ? ; file handle
str ends
dosqhandtype proc far
Enter dosqhandtype ; push registers
mov bx,[bp].Handle ; get file handle
mov ax,4400h
int 21h ; get handle type
lds si,[bp].AttributePtr ; setup area for attribute return
mov ds:[si],dx
lds si,[bp].HandleTypePtr
mov ds:word ptr [si],0 ; assume it is a file
test dx,00080h ; test for file
jz ItIsAFile ; jump if true
mov ds:word ptr [si],1 ; else, it is a device, set flag
ItIsAFile:
Mexit ; pop registers
ret size str - 6 ; return
dosqhandtype endp
dosxxx ends
end
|
