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/*
* Copyright 2003-2018 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 "Traits.hxx"
#include "util/StringCompare.hxx"
#include <string.h>
template<typename Traits>
typename Traits::string
BuildPathImpl(typename Traits::const_pointer_type a, size_t a_size,
typename Traits::const_pointer_type b, size_t b_size)
{
assert(a != nullptr);
assert(b != nullptr);
if (a_size == 0)
return typename Traits::string(b, b_size);
if (b_size == 0)
return typename Traits::string(a, a_size);
typename Traits::string result(a, a_size);
if (!Traits::IsSeparator(a[a_size - 1]))
result.push_back(Traits::SEPARATOR);
if (Traits::IsSeparator(b[0]))
result.append(b + 1, b_size - 1);
else
result.append(b, b_size);
return result;
}
template<typename Traits>
typename Traits::const_pointer_type
GetBasePathImpl(typename Traits::const_pointer_type p)
{
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
typename Traits::const_pointer_type sep = Traits::FindLastSeparator(p);
return sep != nullptr
? sep + 1
: p;
}
template<typename Traits>
typename Traits::string
GetParentPathImpl(typename Traits::const_pointer_type p)
{
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
typename Traits::const_pointer_type sep = Traits::FindLastSeparator(p);
if (sep == nullptr)
return typename Traits::string(Traits::CURRENT_DIRECTORY);
if (sep == p)
return typename Traits::string(p, p + 1);
#ifdef _WIN32
if (Traits::IsDrive(p) && sep == p + 2)
return typename Traits::string(p, p + 3);
#endif
return typename Traits::string(p, sep);
}
template<typename Traits>
typename Traits::const_pointer_type
RelativePathImpl(typename Traits::const_pointer_type base,
typename Traits::const_pointer_type other)
{
assert(base != nullptr);
assert(other != nullptr);
other = StringAfterPrefix(other, base);
if (other == nullptr)
/* mismatch */
return nullptr;
if (*other != 0) {
if (!Traits::IsSeparator(*other)) {
if (*base != 0 && Traits::IsSeparator(other[-1]))
/* "other" has no more slash, but the
matching base ended with a slash:
enough to detect a match */
return other;
/* mismatch */
return nullptr;
}
/* skip remaining path separators */
do {
++other;
} while (Traits::IsSeparator(*other));
}
return other;
}
PathTraitsFS::string
PathTraitsFS::Build(const_pointer_type a, size_t a_size,
const_pointer_type b, size_t b_size) noexcept
{
return BuildPathImpl<PathTraitsFS>(a, a_size, b, b_size);
}
PathTraitsFS::const_pointer_type
PathTraitsFS::GetBase(PathTraitsFS::const_pointer_type p) noexcept
{
return GetBasePathImpl<PathTraitsFS>(p);
}
PathTraitsFS::string
PathTraitsFS::GetParent(PathTraitsFS::const_pointer_type p) noexcept
{
return GetParentPathImpl<PathTraitsFS>(p);
}
PathTraitsFS::const_pointer_type
PathTraitsFS::Relative(const_pointer_type base, const_pointer_type other) noexcept
{
return RelativePathImpl<PathTraitsFS>(base, other);
}
PathTraitsFS::string
PathTraitsFS::Apply(const_pointer_type base, const_pointer_type path) noexcept
{
// TODO: support the Windows syntax (absolute path with or without drive, drive with relative path)
if (base == nullptr)
return path;
if (IsAbsolute(path))
return path;
return Build(base, path);
}
PathTraitsUTF8::string
PathTraitsUTF8::Build(const_pointer_type a, size_t a_size,
const_pointer_type b, size_t b_size) noexcept
{
return BuildPathImpl<PathTraitsUTF8>(a, a_size, b, b_size);
}
PathTraitsUTF8::const_pointer_type
PathTraitsUTF8::GetBase(const_pointer_type p) noexcept
{
return GetBasePathImpl<PathTraitsUTF8>(p);
}
PathTraitsUTF8::string
PathTraitsUTF8::GetParent(const_pointer_type p) noexcept
{
return GetParentPathImpl<PathTraitsUTF8>(p);
}
PathTraitsUTF8::const_pointer_type
PathTraitsUTF8::Relative(const_pointer_type base,
const_pointer_type other) noexcept
{
return RelativePathImpl<PathTraitsUTF8>(base, other);
}
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