VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/string/RTStrNICmpAscii.cpp@ 81106

Last change on this file since 81106 was 76553, checked in by vboxsync, 6 years ago

scm --update-copyright-year

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 2.5 KB
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1/* $Id: RTStrNICmpAscii.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2/** @file
3 * IPRT - RTStrNICmpAscii.
4 */
5
6/*
7 * Copyright (C) 2010-2019 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#include <iprt/string.h>
32#include "internal/iprt.h"
33
34#include <iprt/assert.h>
35#include <iprt/ctype.h>
36
37
38RTDECL(int) RTStrNICmpAscii(const char *psz1, const char *psz2, size_t cchMax)
39{
40 if (cchMax == 0)
41 return 0;
42 if (psz1 == psz2)
43 return 0;
44 if (!psz1)
45 return -1;
46 if (!psz2)
47 return 1;
48
49 for (;;)
50 {
51 RTUNICP uc1;
52 int rc = RTStrGetCpNEx(&psz1, &cchMax, &uc1);
53 if (RT_SUCCESS(rc))
54 {
55 unsigned char uch2 = *psz2++; Assert(uch2 < 0x80);
56
57 /* compare */
58 int iDiff = uc1 - uch2;
59 if (iDiff)
60 {
61 if (uc1 >= 0x80)
62 return 1;
63
64 iDiff = RT_C_TO_LOWER(uc1) - RT_C_TO_LOWER(uch2); /* Return lower cased diff! */
65 if (iDiff)
66 return iDiff;
67 }
68
69 if (uch2 && cchMax)
70 { /* likely */ }
71 else
72 return 0;
73 }
74 /* Hit some bad encoding, continue in case sensitive mode. */
75 else
76 return RTStrNCmp(psz1 - 1, psz2, cchMax + 1);
77 }
78}
79RT_EXPORT_SYMBOL(RTStrNICmpAscii);
80
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