; $Id$

;; @file

; IPRT - No-CRT strncpy - AMD64 & X86.

;

;

; Copyright (C) 2006-2012 Oracle Corporation

;

; 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 (GPL) 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.

;

; The contents of this file may alternatively be used under the terms

; of the Common Development and Distribution License Version 1.0

; (CDDL) only, as it comes in the "COPYING.CDDL" file of the

; VirtualBox OSE distribution, in which case the provisions of the

; CDDL are applicable instead of those of the GPL.

;

; You may elect to license modified versions of this file under the

; terms and conditions of either the GPL or the CDDL or both.

;

%include "iprt/asmdefs.mac"

BEGINCODE

;;

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

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

; @param cbMax gcc: rdx msc: r8 x86:[esp+12]

RT_NOCRT_BEGINPROC strcpy

; input

%ifdef RT_ARCH_AMD64

%ifdef ASM_CALL64_MSC

%define pszDst rcx

%define pszSrc rdx

%define cbMax r8

%else

%define pszDst rdi

%define pszSrc rsi

%define cbMax rdx

%endif

mov r9, pszDst

%else

mov ecx, [esp + 4]

mov edx, [esp + 8]

push ebx

mov ebx, [esp + 12 + 4]

%define pszDst ecx

%define pszSrc edx

%define cbMax ebx

push pszDst

%endif

;

; The rolled out loop.

;

.next:

cmp cbMax, 4

jb .simple_intro

mov al, [pszSrc]

mov [pszDst], al

test al, al

jz .done

mov al, [pszSrc + 1]

mov [pszDst + 1], al

test al, al

jz .done

mov al, [pszSrc + 2]

mov [pszDst + 2], al

test al, al

jz .done

mov al, [pszSrc + 3]

mov [pszDst + 3], al

test al, al

jz .done

add pszDst, 4

add pszSrc, 4

sub cbMax, 4

jmp .next

;

; Char by char.

;

.simple_intro:

test cbMax, cbMax

jz .done

.simple_next:

mov al, [pszSrc]

mov [pszDst], al

test al, al

jz .done

dec cbMax

jz .done

inc pszSrc

inc pszDst

jmp .simple_next

.done:

%ifdef RT_ARCH_AMD64

mov rax, r9

%else

pop ebx

pop eax

%endif

ret

ENDPROC RT_NOCRT(strcpy)