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;* ChangeDir - Changes current (default) directory.
;*
;* Shows:   DOS Function - 3Bh (Set Current Directory)
;*
;* Params:  pspec - Pointer to ASCIIZ pathname of target subdirectory
;*
;* Return:  Short integer with error code
;*          0 if successful
;*          1 if delete error or subdirectory not empty
 
ChangeDir PROC \
        USES ds, \
        pspec:PTR BYTE
 
        LoadPtr ds, dx, pspec           ; Point DS:DX to path spec
        mov     ah, 3Bh                 ; DOS Function 3Bh
        int     21h                     ; Set Current Directory
        mov     ax, 0                   ; Set error code, keep flags
        jnc     exit                    ; Exit if successful
        inc     ax                      ; Else set error code to 1
exit:   ret
 
ChangeDir ENDP
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