.386p
locals

public  STRCAT

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

STRCAT:
        push esi edi
        cld

        mov edi,[esp+4+8+04h]
        mov edx,edi
        or ecx,-1
        xor al,al
        repne scasb
        lea esi,[edi-1]

        mov edi,[esp+4+8+00h]
        or ecx,-1
        repne scasb
        not ecx
        sub edi,ecx
        mov eax,edx

        xchg edi,esi
        mov edx,ecx
        shr ecx,2
        rep movsd
        mov ecx,edx
        and ecx,3
        rep movsb

        pop edi esi
        ret 08h

_TEXT           ends
end