; $Id$

;; @file

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

;

;

; Copyright (C) 2006-2007 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 psz gcc: rdi msc: rcx x86:[esp+4]

; @param ch gcc: esi msc: edx x86:[esp+8]

RT_NOCRT_BEGINPROC strchr

cld

; check for ch == 0 and setup normal strchr.

%ifdef RT_ARCH_AMD64

%ifdef ASM_CALL64_MSC

or dl, dl

jz near .strlen

mov r9, rsi ; save rsi

mov rsi, rcx

%else

or sil, sil

jz near .strlen

mov edx, esi

mov rsi, rdi

%endif

%else

mov edx, [esp + 8]

or dl, dl

jz near .strlen

mov ecx, esi ; save esi

mov esi, [esp + 4]

%endif

; do the search

.next:

lodsb

cmp al, dl

je .found

test al, al

jz .not_found

lodsb

cmp al, dl

je .found

test al, al

jz .not_found

lodsb

cmp al, dl

je .found

test al, al

jz .not_found

lodsb

cmp al, dl

je .found

test al, al

jz .not_found

jmp .next

.found:

lea xAX, [xSI - 1]

%ifdef ASM_CALL64_MSC

mov rsi, r9

%endif

%ifdef RT_ARCH_X86

mov esi, ecx

%endif

ret

.not_found:

%ifdef ASM_CALL64_MSC

mov rsi, r9

%endif

%ifdef RT_ARCH_X86

mov esi, ecx

%endif

xor eax, eax

ret

;

; Special case: strchr(str, '\0');

;

align 16

.strlen:

%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

mov xCX, -1

xor eax, eax

repne scasb

lea xAX, [xDI - 1]

%ifdef ASM_CALL64_MSC

mov rdi, r9

%endif

%ifdef RT_ARCH_X86

mov edi, edx

%endif

ret

ENDPROC RT_NOCRT(strchr)