; $Id$

;; @file

; InnoTek Portable Runtime - No-CRT strcmp - AMD64 & X86.

;

;

; Copyright (C) 2006 InnoTek Systemberatung GmbH

;

; This file is part of VirtualBox Open Source Edition (OSE), as

; available from http://www.virtualbox.org. This file is free software;

; you can redistribute it and/or modify it under the terms of the GNU

; General Public License as published by the Free Software Foundation,

; in version 2 as it comes in the "COPYING" file of the VirtualBox OSE

; distribution. VirtualBox OSE is distributed in the hope that it will

; be useful, but WITHOUT ANY WARRANTY of any kind.

;

; If you received this file as part of a commercial VirtualBox

; distribution, then only the terms of your commercial VirtualBox

; license agreement apply instead of the previous paragraph.

;

%include "iprt/asmdefs.mac"

BEGINCODE

;;

; @param psz1 gcc: rdi msc: rcx x86:[esp+4]

; @param psz2 gcc: rsi msc: rdx x86:[esp+8]

BEGINPROC RT_NOCRT(strcmp)

; input

%ifdef __AMD64__

%ifdef ASM_CALL64_MSC

%define psz1 rcx

%define psz2 rdx

%else

%define psz1 rdi

%define psz2 rsi

%endif

%else

mov ecx, [esp + 4]

mov edx, [esp + 8]

%define psz1 ecx

%define psz2 edx

%endif

;

; The loop.

;

.next:

mov al, [psz1]

mov ah, [psz2]

cmp al, ah

jne .not_equal

test al, al

jz .equal

mov al, [psz1 + 1]

mov ah, [psz2 + 1]

cmp al, ah

jne .not_equal

test al, al

jz .equal

inc psz1

inc psz2

mov al, [psz1 + 2]

mov ah, [psz2 + 2]

cmp al, ah

jne .not_equal

test al, al

jz .equal

inc psz1

inc psz2

mov al, [psz1 + 3]

mov ah, [psz2 + 3]

cmp al, ah

jne .not_equal

test al, al

jz .equal

add psz1, 4

add psz2, 4

jmp .next

.equal:

xor eax, eax

ret

.not_equal:

movzx ecx, ah

and eax, 0ffh

sub eax, ecx

ret

ENDPROC RT_NOCRT(strcmp)