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page 80,132
title CP/DOS DosWrite mapper
dosxxx segment byte public 'dos'
assume cs:dosxxx,ds:nothing,es:nothing,ss:nothing
;**********************************************************************
;*
;* MODULE: doswrite
;*
;* FUNCTION: Write a specified number of bytes to a file
;*
;* CALLING SEQUENCE:
;*
;* push word file handle
;* push@ other buffer area
;* push word buffer length
;* push@ word bytes written
;* call doswrite
;*
;* MODULES CALLED: PC-DOS Int 21h, ah=40h, write
;*
;*********************************************************************
public doswrite
.sall
.xlist
include macros.inc
.list
str struc
old_bp dw ?
return dd ?
Written dd ? ; number of bytes actually written
Bufflng dw ? ; number of bytes to be written
Buffer dd ? ; write buffer address
Handle dw ? ; file handle
str ends
doswrite proc far
Enter doswrite ; push registers
mov bx,[bp].handle ; get handle
lds dx,[bp].buffer ; set write buffer
mov cx,[bp].bufflng ; number of bytes to be written
mov ah,40h ; load opcode
int 21h ; write bytes to the file
jc exit ; jump if error
lds si,[bp].written ; pointer to return data
mov word ptr [si],ax ; save actual number of bytes written
sub ax,ax ; set good return code
exit: mexit ; pop registers
ret size str - 6 ; return
doswrite endp
dosxxx ends
end
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