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/*
* Copyright (C) 2003-2015 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.
*/
#ifndef MPD_FS_TRAITS_HXX
#define MPD_FS_TRAITS_HXX
#include "check.h"
#include "Compiler.h"
#ifdef WIN32
#include "util/CharUtil.hxx"
#endif
#include <string>
#include <string.h>
#include <assert.h>
/**
* This class describes the nature of a native filesystem path.
*/
struct PathTraitsFS {
typedef std::string string;
typedef char value_type;
typedef value_type *pointer;
typedef const value_type *const_pointer;
#ifdef WIN32
static constexpr value_type SEPARATOR = '\\';
#else
static constexpr value_type SEPARATOR = '/';
#endif
static constexpr const_pointer CURRENT_DIRECTORY = ".";
static constexpr bool IsSeparator(value_type ch) {
return
#ifdef WIN32
ch == '/' ||
#endif
ch == SEPARATOR;
}
gcc_pure gcc_nonnull_all
static const_pointer FindLastSeparator(const_pointer p) {
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
#ifdef WIN32
const_pointer pos = p + GetLength(p);
while (p != pos && !IsSeparator(*pos))
--pos;
return IsSeparator(*pos) ? pos : nullptr;
#else
return strrchr(p, SEPARATOR);
#endif
}
#ifdef WIN32
gcc_pure gcc_nonnull_all
static constexpr bool IsDrive(const_pointer p) {
return IsAlphaASCII(p[0]) && p[1] == ':';
}
#endif
gcc_pure gcc_nonnull_all
static bool IsAbsolute(const_pointer p) {
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
#ifdef WIN32
if (IsDrive(p) && IsSeparator(p[2]))
return true;
#endif
return IsSeparator(*p);
}
gcc_pure gcc_nonnull_all
static size_t GetLength(const_pointer p) {
return strlen(p);
}
/**
* Determine the "base" file name of the given native path.
* The return value points inside the given string.
*/
gcc_pure gcc_nonnull_all
static const_pointer GetBase(const_pointer p);
/**
* Determine the "parent" file name of the given native path.
* As a special case, returns the string "." if there is no
* separator in the given input string.
*/
gcc_pure gcc_nonnull_all
static string GetParent(const_pointer p);
/**
* Determine the relative part of the given path to this
* object, not including the directory separator. Returns an
* empty string if the given path equals this object or
* nullptr on mismatch.
*/
gcc_pure gcc_nonnull_all
static const_pointer Relative(const_pointer base, const_pointer other);
/**
* Constructs the path from the given components.
* If either of the components is empty string,
* remaining component is returned unchanged.
* If both components are empty strings, empty string is returned.
*/
gcc_pure gcc_nonnull_all
static string Build(const_pointer a, size_t a_size,
const_pointer b, size_t b_size);
gcc_pure gcc_nonnull_all
static string Build(const_pointer a, const_pointer b) {
return Build(a, GetLength(a), b, GetLength(b));
}
};
/**
* This class describes the nature of a MPD internal filesystem path.
*/
struct PathTraitsUTF8 {
typedef std::string string;
typedef char value_type;
typedef value_type *pointer;
typedef const value_type *const_pointer;
static constexpr value_type SEPARATOR = '/';
static constexpr const_pointer CURRENT_DIRECTORY = ".";
static constexpr bool IsSeparator(value_type ch) {
return ch == SEPARATOR;
}
gcc_pure gcc_nonnull_all
static const_pointer FindLastSeparator(const_pointer p) {
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
return strrchr(p, SEPARATOR);
}
#ifdef WIN32
gcc_pure gcc_nonnull_all
static constexpr bool IsDrive(const_pointer p) {
return IsAlphaASCII(p[0]) && p[1] == ':';
}
#endif
gcc_pure gcc_nonnull_all
static bool IsAbsolute(const_pointer p) {
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
assert(p != nullptr);
#endif
#ifdef WIN32
if (IsDrive(p) && IsSeparator(p[2]))
return true;
#endif
return IsSeparator(*p);
}
gcc_pure gcc_nonnull_all
static size_t GetLength(const_pointer p) {
return strlen(p);
}
/**
* Determine the "base" file name of the given UTF-8 path.
* The return value points inside the given string.
*/
gcc_pure gcc_nonnull_all
static const_pointer GetBase(const_pointer p);
/**
* Determine the "parent" file name of the given UTF-8 path.
* As a special case, returns the string "." if there is no
* separator in the given input string.
*/
gcc_pure gcc_nonnull_all
static string GetParent(const_pointer p);
/**
* Determine the relative part of the given path to this
* object, not including the directory separator. Returns an
* empty string if the given path equals this object or
* nullptr on mismatch.
*/
gcc_pure gcc_nonnull_all
static const_pointer Relative(const_pointer base, const_pointer other);
/**
* Constructs the path from the given components.
* If either of the components is empty string,
* remaining component is returned unchanged.
* If both components are empty strings, empty string is returned.
*/
gcc_pure gcc_nonnull_all
static string Build(const_pointer a, size_t a_size,
const_pointer b, size_t b_size);
gcc_pure gcc_nonnull_all
static string Build(const_pointer a, const_pointer b) {
return Build(a, GetLength(a), b, GetLength(b));
}
};
#endif
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