; $Id: wcslen.asm 98103 2023-01-17 14:15:46Z vboxsync $ ;; @file ; IPRT - No-CRT strlen - AMD64 & X86. ; ; ; Copyright (C) 2006-2023 Oracle and/or its affiliates. ; ; This file is part of VirtualBox base platform packages, as ; available from https://www.virtualbox.org. ; ; This program 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 3 of the ; License. ; ; This program is distributed in the hope that it will be useful, but ; WITHOUT ANY WARRANTY; without even the implied warranty of ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ; General Public License for more details. ; ; You should have received a copy of the GNU General Public License ; along with this program; if not, see . ; ; The contents of this file may alternatively be used under the terms ; of the Common Development and Distribution License Version 1.0 ; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included ; in the VirtualBox 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. ; ; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 ; %include "iprt/asmdefs.mac" BEGINCODE ;; ; @param psz gcc: rdi msc: rcx x86: [esp+4] wcall: eax RT_NOCRT_BEGINPROC wcslen cld %ifdef RT_ARCH_AMD64 %ifdef ASM_CALL64_MSC mov r9, rdi ; save rdi mov rdi, rcx %endif %else mov edx, edi ; save edi %ifdef ASM_CALL32_WATCOM mov edi, eax %else mov edi, [esp + 4] %endif %endif ; do the search mov xCX, -1 xor eax, eax repne scasw ; found it neg xCX lea xAX, [xCX - 2] shr xCX, 1 %ifdef ASM_CALL64_MSC mov rdi, r9 %elifdef RT_ARCH_X86 mov edi, edx %endif ret ENDPROC RT_NOCRT(wcslen)