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/* $Id: RTStrNICmpAscii.cpp $ */
/** @file
* IPRT - RTStrNICmpAscii.
*/
/*
* Copyright (C) 2010-2019 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.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/string.h>
#include "internal/iprt.h"
#include <iprt/assert.h>
#include <iprt/ctype.h>
RTDECL(int) RTStrNICmpAscii(const char *psz1, const char *psz2, size_t cchMax)
{
if (cchMax == 0)
return 0;
if (psz1 == psz2)
return 0;
if (!psz1)
return -1;
if (!psz2)
return 1;
for (;;)
{
RTUNICP uc1;
int rc = RTStrGetCpNEx(&psz1, &cchMax, &uc1);
if (RT_SUCCESS(rc))
{
unsigned char uch2 = *psz2++; Assert(uch2 < 0x80);
/* compare */
int iDiff = uc1 - uch2;
if (iDiff)
{
if (uc1 >= 0x80)
return 1;
iDiff = RT_C_TO_LOWER(uc1) - RT_C_TO_LOWER(uch2); /* Return lower cased diff! */
if (iDiff)
return iDiff;
}
if (uch2 && cchMax)
{ /* likely */ }
else
return 0;
}
/* Hit some bad encoding, continue in case sensitive mode. */
else
return RTStrNCmp(psz1 - 1, psz2, cchMax + 1);
}
}
RT_EXPORT_SYMBOL(RTStrNICmpAscii);
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