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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#if defined(_WIN32)
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#include <o3tl/safeint.hxx>
+#include <sal/types.h>
+#include <tools/pathutils.hxx>
+
+namespace tools {
+
+WCHAR * filename(WCHAR * path) {
+ WCHAR * f = path;
+ for (WCHAR * p = path;;) {
+ switch (*p++) {
+ case L'\0':
+ return f;
+ case L'\\':
+ f = p;
+ break;
+ }
+ }
+}
+
+WCHAR * buildPath(
+ WCHAR * path, WCHAR const * frontBegin, WCHAR const * frontEnd,
+ WCHAR const * backBegin, std::size_t backLength)
+{
+ // Remove leading ".." segments in the second path together with matching
+ // segments in the first path that are neither empty nor "." nor ".." nor
+ // end in ":" (which is not foolproof, as it can erroneously erase the start
+ // of a UNC path, but only if the input is bad data):
+ while (backLength >= 2 && backBegin[0] == L'.' && backBegin[1] == L'.' &&
+ (backLength == 2 || backBegin[2] == L'\\'))
+ {
+ if (frontEnd - frontBegin < 2 || frontEnd[-1] != L'\\' ||
+ frontEnd[-2] == L'\\' || frontEnd[-2] == L':' ||
+ (frontEnd[-2] == L'.' &&
+ (frontEnd - frontBegin < 3 || frontEnd[-3] == L'\\' ||
+ (frontEnd[-3] == L'.' &&
+ (frontEnd - frontBegin < 4 || frontEnd[-4] == L'\\')))))
+ {
+ break;
+ }
+ WCHAR const * p = frontEnd - 1;
+ while (p != frontBegin && p[-1] != L'\\') {
+ --p;
+ }
+ if (p == frontBegin) {
+ break;
+ }
+ frontEnd = p;
+ if (backLength == 2) {
+ backBegin += 2;
+ backLength -= 2;
+ } else {
+ backBegin += 3;
+ backLength -= 3;
+ }
+ }
+ if (backLength <
+ o3tl::make_unsigned(MAX_PATH - (frontEnd - frontBegin)))
+ {
+ WCHAR * p;
+ if (frontBegin == path) {
+ p = const_cast< WCHAR * >(frontEnd);
+ } else {
+ p = path;
+ while (frontBegin != frontEnd) {
+ *p++ = *frontBegin++;
+ }
+ }
+ for (; backLength > 0; --backLength) {
+ *p++ = *backBegin++;
+ }
+ *p = L'\0';
+ return p;
+ } else {
+ SetLastError(ERROR_FILENAME_EXCED_RANGE);
+ return nullptr;
+ }
+}
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */