77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
/*
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* Copyright 2003-2019 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "LookupFile.hxx"
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#include "FileInfo.hxx"
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#include "system/Error.hxx"
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gcc_pure
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static PathTraitsFS::pointer_type
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FindSlash(PathTraitsFS::pointer_type p, size_t i) noexcept
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{
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for (; i > 0; --i)
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if (p[i] == '/')
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return p + i;
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return nullptr;
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}
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ArchiveLookupResult
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LookupFile(Path pathname)
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{
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PathTraitsFS::string buffer(pathname.c_str());
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size_t idx = buffer.size();
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PathTraitsFS::pointer_type slash = nullptr;
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while (true) {
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try {
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//try to stat if its real directory
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const FileInfo file_info(Path::FromFS(buffer.c_str()));
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//is something found ins original path (is not an archive)
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if (slash == nullptr)
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return {};
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//its a file ?
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if (file_info.IsRegular()) {
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//so the upper should be file
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return {AllocatedPath::FromFS(buffer.c_str()), AllocatedPath::FromFS(slash + 1)};
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} else {
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return {};
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}
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} catch (const std::system_error &e) {
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if (!IsPathNotFound(e))
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throw;
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}
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//find one dir up
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if (slash != nullptr)
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*slash = '/';
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slash = FindSlash(&buffer.front(), idx - 1);
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if (slash == nullptr)
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return {};
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*slash = 0;
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idx = slash - buffer.c_str();
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}
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}
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