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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "LookupFile.hxx"
#include "FileInfo.hxx"
#include "system/Error.hxx"
gcc_pure
static PathTraitsFS::pointer
FindSlash(PathTraitsFS::pointer p, size_t i) noexcept
{
for (; i > 0; --i)
if (p[i] == '/')
return p + i;
return nullptr;
}
ArchiveLookupResult
LookupFile(Path pathname)
{
PathTraitsFS::string buffer(pathname.c_str());
size_t idx = buffer.size();
PathTraitsFS::pointer slash = nullptr;
while (true) {
try {
//try to stat if its real directory
const FileInfo file_info(Path::FromFS(buffer.c_str()));
//is something found ins original path (is not an archive)
if (slash == nullptr)
return {};
//its a file ?
if (file_info.IsRegular()) {
//so the upper should be file
return {AllocatedPath::FromFS(buffer), AllocatedPath::FromFS(slash + 1)};
} else {
return {};
}
} catch (const std::system_error &e) {
if (!IsPathNotFound(e))
throw;
}
//find one dir up
if (slash != nullptr)
*slash = '/';
slash = FindSlash(&buffer.front(), idx - 1);
if (slash == nullptr)
return {};
*slash = 0;
idx = slash - buffer.c_str();
}
}
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