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|
;
page 80,132
;
title CP/DOS DosChDir mapper
;
dosxxx segment byte public 'dos'
assume cs:dosxxx,ds:nothing,es:nothing,ss:nothing
;
; ************************************************************************* *
; *
; * MODULE: DosChDir
; *
; * FUNCTION: change directory name
; *
; * FUNCTION: This module will change the current directory for the
; * requesting process.
; *
; *
; * CALLING SEQUENCE:
; *
; * PUSH@ ASCIIZ Dirname ; Directory path name
; * PUSH DWORD 0 ; Reserved (must be zero) took out @
; * ; 5/28 to match 3/25 spec
; * CALL DosChDir
; *
; *
; * RETURN SEQUENCE:
; *
; * IF ERROR (AX NOT = 0)
; *
; * AX = Error Code:
; *
; * o Invalid directory path
; *
; * MODULES CALLED:
; * DOS int 21h function 3Bh ; Change current directory
; *
; *************************************************************************
public DosChDir
.sall
.xlist
include macros.inc
.list
str struc
old_bp dw ?
return dd ?
dtrm006 dd 0h ;reserved (must be zero)
dnam006 dd ? ;address of directory path name
str ends
DosChDir proc far
Enter DosChDir ; push registers
mov dx, word ptr [bp].dnam006 ;load directory name offset
mov ax, word ptr [bp].dnam006+2 ;load directory name segment
push ax ; set segment in DS
pop ds
mov ax,03b00h ; load chdir op code
int 21h ; call dos to change the directory
jc exit ; jump if error
xor ax,ax ; else, good return code
exit: mexit ; pop registers
ret size str - 6 ; return
DosChDir endp
dosxxx ends
end
|
