; $Id: strlen.asm 14021 2008-11-10 16:31:22Z vboxsync $ ;; @file ; IPRT - No-CRT strlen - AMD64 & X86. ; ; ; Copyright (C) 2006-2008 Sun Microsystems, Inc. ; ; 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. ; ; Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa ; Clara, CA 95054 USA or visit http://www.sun.com if you need ; additional information or have any questions. ; %include "iprt/asmdefs.mac" BEGINCODE ;; ; @param psz gcc: rdi msc: rcx x86: [esp+4] RT_NOCRT_BEGINPROC strlen cld %ifdef RT_ARCH_AMD64 %ifdef ASM_CALL64_MSC mov r9, rdi ; save rdi mov rdi, rcx %endif %else mov edx, edi ; save edi mov edi, [esp + 4] %endif ; do the search mov xCX, -1 xor eax, eax repne scasb ; found it neg xCX lea xAX, [xCX - 2] %ifdef ASM_CALL64_MSC mov rdi, r9 %endif %ifdef RT_ARCH_X86 mov edi, edx %endif ret ENDPROC RT_NOCRT(strlen)