.386p
locals

public  MB_FREE

_TEXT           segment byte public use32 'CODE'
assume  cs:_TEXT

MB_FREE:
        push esi edi

        mov eax,[esp+4+8]
        mov di,[eax+8]
        mov si,[eax+10]
        mov ax,502h
        int 31h
        jc short @@00

        mov ecx,[esp+4+8]
        xor eax,eax
        mov [ecx+4],eax
        jmp short @@01

@@00:
        movsx eax,ax
        cmp ah,80h
        je short @@01
        mov eax,-32768

@@01:
        pop edi esi
        ret 4

_TEXT           ends
end