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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_FSTREAM
#define _LIBCPP_FSTREAM
/*
fstream synopsis
template <class charT, class traits = char_traits<charT> >
class basic_filebuf
: public basic_streambuf<charT, traits>
{
public:
typedef charT char_type;
typedef traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// 27.9.1.2 Constructors/destructor:
basic_filebuf();
basic_filebuf(basic_filebuf&& rhs);
virtual ~basic_filebuf();
// 27.9.1.3 Assign/swap:
basic_filebuf& operator=(basic_filebuf&& rhs);
void swap(basic_filebuf& rhs);
// 27.9.1.4 Members:
bool is_open() const;
basic_filebuf* open(const char* s, ios_base::openmode mode);
basic_filebuf* open(const string& s, ios_base::openmode mode);
basic_filebuf* open(const filesystem::path& p, ios_base::openmode mode); // C++17
basic_filebuf* close();
protected:
// 27.9.1.5 Overridden virtual functions:
virtual streamsize showmanyc();
virtual int_type underflow();
virtual int_type uflow();
virtual int_type pbackfail(int_type c = traits_type::eof());
virtual int_type overflow (int_type c = traits_type::eof());
virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* s, streamsize n);
virtual pos_type seekoff(off_type off, ios_base::seekdir way,
ios_base::openmode which = ios_base::in | ios_base::out);
virtual pos_type seekpos(pos_type sp,
ios_base::openmode which = ios_base::in | ios_base::out);
virtual int sync();
virtual void imbue(const locale& loc);
};
template <class charT, class traits>
void
swap(basic_filebuf<charT, traits>& x, basic_filebuf<charT, traits>& y);
typedef basic_filebuf<char> filebuf;
typedef basic_filebuf<wchar_t> wfilebuf;
template <class charT, class traits = char_traits<charT> >
class basic_ifstream
: public basic_istream<charT,traits>
{
public:
typedef charT char_type;
typedef traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
basic_ifstream();
explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in);
explicit basic_ifstream(const string& s, ios_base::openmode mode = ios_base::in);
template<class T>
explicit basic_ifstream(const T& s, ios_base::openmode mode = ios_base::in); // Since C++17
basic_ifstream(basic_ifstream&& rhs);
basic_ifstream& operator=(basic_ifstream&& rhs);
void swap(basic_ifstream& rhs);
basic_filebuf<char_type, traits_type>* rdbuf() const;
native_handle_type native_handle() const noexcept; // Since C++26
bool is_open() const;
void open(const char* s, ios_base::openmode mode = ios_base::in);
void open(const string& s, ios_base::openmode mode = ios_base::in);
void open(const filesystem::path& s, ios_base::openmode mode = ios_base::in); // C++17
void close();
};
template <class charT, class traits>
void
swap(basic_ifstream<charT, traits>& x, basic_ifstream<charT, traits>& y);
typedef basic_ifstream<char> ifstream;
typedef basic_ifstream<wchar_t> wifstream;
template <class charT, class traits = char_traits<charT> >
class basic_ofstream
: public basic_ostream<charT,traits>
{
public:
typedef charT char_type;
typedef traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
basic_ofstream();
explicit basic_ofstream(const char* s, ios_base::openmode mode = ios_base::out);
explicit basic_ofstream(const string& s, ios_base::openmode mode = ios_base::out);
template<class T>
explicit basic_ofstream(const T& s, ios_base::openmode mode = ios_base::out); // Since C++17
basic_ofstream(basic_ofstream&& rhs);
basic_ofstream& operator=(basic_ofstream&& rhs);
void swap(basic_ofstream& rhs);
basic_filebuf<char_type, traits_type>* rdbuf() const;
native_handle_type native_handle() const noexcept; // Since C++26
bool is_open() const;
void open(const char* s, ios_base::openmode mode = ios_base::out);
void open(const string& s, ios_base::openmode mode = ios_base::out);
void open(const filesystem::path& p,
ios_base::openmode mode = ios_base::out); // C++17
void close();
};
template <class charT, class traits>
void
swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y);
typedef basic_ofstream<char> ofstream;
typedef basic_ofstream<wchar_t> wofstream;
template <class charT, class traits=char_traits<charT> >
class basic_fstream
: public basic_iostream<charT,traits>
{
public:
typedef charT char_type;
typedef traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
basic_fstream();
explicit basic_fstream(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
explicit basic_fstream(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
template<class T>
explicit basic_fstream(const T& s, ios_base::openmode mode = ios_base::in | ios_base::out); // Since C++17
basic_fstream(basic_fstream&& rhs);
basic_fstream& operator=(basic_fstream&& rhs);
void swap(basic_fstream& rhs);
basic_filebuf<char_type, traits_type>* rdbuf() const;
native_handle_type native_handle() const noexcept; // Since C++26
bool is_open() const;
void open(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
void open(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
void open(const filesystem::path& s,
ios_base::openmode mode = ios_base::in|ios_base::out); // C++17
void close();
};
template <class charT, class traits>
void swap(basic_fstream<charT, traits>& x, basic_fstream<charT, traits>& y);
typedef basic_fstream<char> fstream;
typedef basic_fstream<wchar_t> wfstream;
} // std
*/
#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
# include <__cxx03/fstream>
#else
# include <__config>
# if _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION
# include <__algorithm/max.h>
# include <__assert>
# include <__filesystem/path.h>
# include <__fwd/fstream.h>
# include <__locale>
# include <__memory/addressof.h>
# include <__memory/unique_ptr.h>
# include <__ostream/basic_ostream.h>
# include <__type_traits/enable_if.h>
# include <__type_traits/is_same.h>
# include <__utility/move.h>
# include <__utility/swap.h>
# include <__utility/unreachable.h>
# include <cstdio>
# include <istream>
# include <streambuf>
# include <typeinfo>
# include <version>
# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
# endif
_LIBCPP_PUSH_MACROS
# include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
# if _LIBCPP_STD_VER >= 26 && defined(_LIBCPP_WIN32API)
_LIBCPP_EXPORTED_FROM_ABI void* __filebuf_windows_native_handle(FILE* __file) noexcept;
# endif
template <class _CharT, class _Traits>
class basic_filebuf : public basic_streambuf<_CharT, _Traits> {
public:
typedef _CharT char_type;
typedef _Traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
typedef typename traits_type::state_type state_type;
# if _LIBCPP_STD_VER >= 26
# if defined(_LIBCPP_WIN32API)
using native_handle_type = void*; // HANDLE
# elif __has_include(<unistd.h>)
using native_handle_type = int; // POSIX file descriptor
# else
# error "Provide a native file handle!"
# endif
# endif
// 27.9.1.2 Constructors/destructor:
basic_filebuf();
basic_filebuf(basic_filebuf&& __rhs);
~basic_filebuf() override;
// 27.9.1.3 Assign/swap:
_LIBCPP_HIDE_FROM_ABI basic_filebuf& operator=(basic_filebuf&& __rhs);
void swap(basic_filebuf& __rhs);
// 27.9.1.4 Members:
_LIBCPP_HIDE_FROM_ABI bool is_open() const;
basic_filebuf* open(const char* __s, ios_base::openmode __mode);
# if _LIBCPP_HAS_OPEN_WITH_WCHAR
basic_filebuf* open(const wchar_t* __s, ios_base::openmode __mode);
# endif
_LIBCPP_HIDE_FROM_ABI basic_filebuf* open(const string& __s, ios_base::openmode __mode);
# if _LIBCPP_STD_VER >= 17
_LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI basic_filebuf*
open(const filesystem::path& __p, ios_base::openmode __mode) {
return open(__p.c_str(), __mode);
}
# endif
_LIBCPP_HIDE_FROM_ABI basic_filebuf* __open(int __fd, ios_base::openmode __mode);
basic_filebuf* close();
# if _LIBCPP_STD_VER >= 26
_LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept {
_LIBCPP_ASSERT_UNCATEGORIZED(this->is_open(), "File must be opened");
# if defined(_LIBCPP_WIN32API)
return std::__filebuf_windows_native_handle(__file_);
# elif __has_include(<unistd.h>)
return fileno(__file_);
# else
# error "Provide a way to determine the file native handle!"
# endif
}
# endif // _LIBCPP_STD_VER >= 26
_LIBCPP_HIDE_FROM_ABI inline static const char* __make_mdstring(ios_base::openmode __mode) _NOEXCEPT;
# if _LIBCPP_HAS_OPEN_WITH_WCHAR
_LIBCPP_HIDE_FROM_ABI inline static const wchar_t* __make_mdwstring(ios_base::openmode __mode) _NOEXCEPT;
# endif
protected:
// 27.9.1.5 Overridden virtual functions:
int_type underflow() override;
int_type pbackfail(int_type __c = traits_type::eof()) override;
int_type overflow(int_type __c = traits_type::eof()) override;
basic_streambuf<char_type, traits_type>* setbuf(char_type* __s, streamsize __n) override;
pos_type
seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __wch = ios_base::in | ios_base::out) override;
pos_type seekpos(pos_type __sp, ios_base::openmode __wch = ios_base::in | ios_base::out) override;
int sync() override;
void imbue(const locale& __loc) override;
private:
char* __extbuf_;
const char* __extbufnext_;
const char* __extbufend_;
char __extbuf_min_[8];
size_t __ebs_;
char_type* __intbuf_;
size_t __ibs_;
FILE* __file_;
const codecvt<char_type, char, state_type>* __cv_;
state_type __st_;
state_type __st_last_;
ios_base::openmode __om_;
// There have been no file operations yet, which allows setting unbuffered
// I/O mode.
static const ios_base::openmode __no_io_operations = ios_base::trunc;
// Unbuffered I/O mode has been requested.
static const ios_base::openmode __use_unbuffered_io = ios_base::ate;
// Used to track the currently used mode and track whether the output should
// be unbuffered.
// [filebuf.virtuals]/12
// If setbuf(0, 0) is called on a stream before any I/O has occurred on
// that stream, the stream becomes unbuffered. Otherwise the results are
// implementation-defined.
// This allows calling setbuf(0, 0)
// - before opening a file,
// - after opening a file, before
// - a read
// - a write
// - a seek.
// Note that opening a file with ios_base::ate does a seek operation.
// Normally underflow, overflow, and sync change this flag to ios_base::in,
// ios_base_out, or 0.
//
// The ios_base::trunc and ios_base::ate flags are not used in __cm_. They
// are used to track the state of the unbuffered request. For readability
// they have the aliases __no_io_operations and __use_unbuffered_io
// respectively.
//
// The __no_io_operations and __use_unbuffered_io flags are used in the
// following way:
// - __no_io_operations is set upon construction to indicate the unbuffered
// state can be set.
// - When requesting unbuffered output:
// - If the file is open it sets the mode.
// - Else places a request by adding the __use_unbuffered_io flag.
// - When a file is opened it checks whether both __no_io_operations and
// __use_unbuffered_io are set. If so switches to unbuffered mode.
// - All file I/O operations change the mode effectively clearing the
// __no_io_operations and __use_unbuffered_io flags.
ios_base::openmode __cm_;
bool __owns_eb_;
bool __owns_ib_;
bool __always_noconv_;
bool __read_mode();
void __write_mode();
_LIBCPP_HIDE_FROM_ABI static int __fseek(FILE* __file, pos_type __offset, int __whence);
_LIBCPP_HIDE_FROM_ABI static pos_type __ftell(FILE* __file);
_LIBCPP_EXPORTED_FROM_ABI friend FILE* __get_ostream_file(ostream&);
// There are multiple (__)open function, they use different C-API open
// function. After that call these functions behave the same. This function
// does that part and determines the final return value.
_LIBCPP_HIDE_FROM_ABI basic_filebuf* __do_open(FILE* __file, ios_base::openmode __mode) {
__file_ = __file;
if (!__file_)
return nullptr;
__om_ = __mode;
if (__cm_ == (__no_io_operations | __use_unbuffered_io)) {
std::setbuf(__file_, nullptr);
__cm_ = 0;
}
if (__mode & ios_base::ate) {
__cm_ = 0;
if (fseek(__file_, 0, SEEK_END)) {
fclose(__file_);
__file_ = nullptr;
return nullptr;
}
}
return this;
}
// If the file is already open, switch to unbuffered mode. Otherwise, record
// the request to use unbuffered mode so that we use that mode when we
// eventually open the file.
_LIBCPP_HIDE_FROM_ABI void __request_unbuffered_mode(char_type* __s, streamsize __n) {
if (__cm_ == __no_io_operations && __s == nullptr && __n == 0) {
if (__file_) {
std::setbuf(__file_, nullptr);
__cm_ = 0;
} else {
__cm_ = __no_io_operations | __use_unbuffered_io;
}
}
}
};
template <class _CharT, class _Traits>
basic_filebuf<_CharT, _Traits>::basic_filebuf()
: __extbuf_(nullptr),
__extbufnext_(nullptr),
__extbufend_(nullptr),
__ebs_(0),
__intbuf_(nullptr),
__ibs_(0),
__file_(nullptr),
__cv_(nullptr),
__st_(),
__st_last_(),
__om_(0),
__cm_(__no_io_operations),
__owns_eb_(false),
__owns_ib_(false),
__always_noconv_(false) {
if (std::has_facet<codecvt<char_type, char, state_type> >(this->getloc())) {
__cv_ = std::addressof(std::use_facet<codecvt<char_type, char, state_type> >(this->getloc()));
__always_noconv_ = __cv_->always_noconv();
}
setbuf(nullptr, 4096);
}
template <class _CharT, class _Traits>
basic_filebuf<_CharT, _Traits>::basic_filebuf(basic_filebuf&& __rhs) : basic_streambuf<_CharT, _Traits>(__rhs) {
if (__rhs.__extbuf_ == __rhs.__extbuf_min_) {
__extbuf_ = __extbuf_min_;
__extbufnext_ = __extbuf_ + (__rhs.__extbufnext_ - __rhs.__extbuf_);
__extbufend_ = __extbuf_ + (__rhs.__extbufend_ - __rhs.__extbuf_);
} else {
__extbuf_ = __rhs.__extbuf_;
__extbufnext_ = __rhs.__extbufnext_;
__extbufend_ = __rhs.__extbufend_;
}
__ebs_ = __rhs.__ebs_;
__intbuf_ = __rhs.__intbuf_;
__ibs_ = __rhs.__ibs_;
__file_ = __rhs.__file_;
__cv_ = __rhs.__cv_;
__st_ = __rhs.__st_;
__st_last_ = __rhs.__st_last_;
__om_ = __rhs.__om_;
__cm_ = __rhs.__cm_;
__owns_eb_ = __rhs.__owns_eb_;
__owns_ib_ = __rhs.__owns_ib_;
__always_noconv_ = __rhs.__always_noconv_;
if (__rhs.pbase()) {
if (__rhs.pbase() == __rhs.__intbuf_)
this->setp(__intbuf_, __intbuf_ + (__rhs.epptr() - __rhs.pbase()));
else
this->setp((char_type*)__extbuf_, (char_type*)__extbuf_ + (__rhs.epptr() - __rhs.pbase()));
this->__pbump(__rhs.pptr() - __rhs.pbase());
} else if (__rhs.eback()) {
if (__rhs.eback() == __rhs.__intbuf_)
this->setg(__intbuf_, __intbuf_ + (__rhs.gptr() - __rhs.eback()), __intbuf_ + (__rhs.egptr() - __rhs.eback()));
else
this->setg((char_type*)__extbuf_,
(char_type*)__extbuf_ + (__rhs.gptr() - __rhs.eback()),
(char_type*)__extbuf_ + (__rhs.egptr() - __rhs.eback()));
}
__rhs.__extbuf_ = nullptr;
__rhs.__extbufnext_ = nullptr;
__rhs.__extbufend_ = nullptr;
__rhs.__ebs_ = 0;
__rhs.__intbuf_ = 0;
__rhs.__ibs_ = 0;
__rhs.__file_ = nullptr;
__rhs.__st_ = state_type();
__rhs.__st_last_ = state_type();
__rhs.__om_ = 0;
__rhs.__cm_ = 0;
__rhs.__owns_eb_ = false;
__rhs.__owns_ib_ = false;
__rhs.setg(0, 0, 0);
__rhs.setp(0, 0);
}
template <class _CharT, class _Traits>
inline basic_filebuf<_CharT, _Traits>& basic_filebuf<_CharT, _Traits>::operator=(basic_filebuf&& __rhs) {
close();
swap(__rhs);
return *this;
}
template <class _CharT, class _Traits>
basic_filebuf<_CharT, _Traits>::~basic_filebuf() {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
close();
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
}
# endif // _LIBCPP_HAS_EXCEPTIONS
if (__owns_eb_)
delete[] __extbuf_;
if (__owns_ib_)
delete[] __intbuf_;
}
template <class _CharT, class _Traits>
void basic_filebuf<_CharT, _Traits>::swap(basic_filebuf& __rhs) {
basic_streambuf<char_type, traits_type>::swap(__rhs);
if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_) {
// Neither *this nor __rhs uses the small buffer, so we can simply swap the pointers.
std::swap(__extbuf_, __rhs.__extbuf_);
std::swap(__extbufnext_, __rhs.__extbufnext_);
std::swap(__extbufend_, __rhs.__extbufend_);
} else {
ptrdiff_t __ln = __extbufnext_ ? __extbufnext_ - __extbuf_ : 0;
ptrdiff_t __le = __extbufend_ ? __extbufend_ - __extbuf_ : 0;
ptrdiff_t __rn = __rhs.__extbufnext_ ? __rhs.__extbufnext_ - __rhs.__extbuf_ : 0;
ptrdiff_t __re = __rhs.__extbufend_ ? __rhs.__extbufend_ - __rhs.__extbuf_ : 0;
if (__extbuf_ == __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_) {
// *this uses the small buffer, but __rhs doesn't.
__extbuf_ = __rhs.__extbuf_;
__rhs.__extbuf_ = __rhs.__extbuf_min_;
std::memmove(__rhs.__extbuf_min_, __extbuf_min_, sizeof(__extbuf_min_));
} else if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ == __rhs.__extbuf_min_) {
// *this doesn't use the small buffer, but __rhs does.
__rhs.__extbuf_ = __extbuf_;
__extbuf_ = __extbuf_min_;
std::memmove(__extbuf_min_, __rhs.__extbuf_min_, sizeof(__extbuf_min_));
} else {
// Both *this and __rhs use the small buffer.
char __tmp[sizeof(__extbuf_min_)];
std::memmove(__tmp, __extbuf_min_, sizeof(__extbuf_min_));
std::memmove(__extbuf_min_, __rhs.__extbuf_min_, sizeof(__extbuf_min_));
std::memmove(__rhs.__extbuf_min_, __tmp, sizeof(__extbuf_min_));
}
__extbufnext_ = __extbuf_ + __rn;
__extbufend_ = __extbuf_ + __re;
__rhs.__extbufnext_ = __rhs.__extbuf_ + __ln;
__rhs.__extbufend_ = __rhs.__extbuf_ + __le;
}
std::swap(__ebs_, __rhs.__ebs_);
std::swap(__intbuf_, __rhs.__intbuf_);
std::swap(__ibs_, __rhs.__ibs_);
std::swap(__file_, __rhs.__file_);
std::swap(__cv_, __rhs.__cv_);
std::swap(__st_, __rhs.__st_);
std::swap(__st_last_, __rhs.__st_last_);
std::swap(__om_, __rhs.__om_);
std::swap(__cm_, __rhs.__cm_);
std::swap(__owns_eb_, __rhs.__owns_eb_);
std::swap(__owns_ib_, __rhs.__owns_ib_);
std::swap(__always_noconv_, __rhs.__always_noconv_);
if (this->eback() == (char_type*)__rhs.__extbuf_min_) {
ptrdiff_t __n = this->gptr() - this->eback();
ptrdiff_t __e = this->egptr() - this->eback();
this->setg((char_type*)__extbuf_min_, (char_type*)__extbuf_min_ + __n, (char_type*)__extbuf_min_ + __e);
} else if (this->pbase() == (char_type*)__rhs.__extbuf_min_) {
ptrdiff_t __n = this->pptr() - this->pbase();
ptrdiff_t __e = this->epptr() - this->pbase();
this->setp((char_type*)__extbuf_min_, (char_type*)__extbuf_min_ + __e);
this->__pbump(__n);
}
if (__rhs.eback() == (char_type*)__extbuf_min_) {
ptrdiff_t __n = __rhs.gptr() - __rhs.eback();
ptrdiff_t __e = __rhs.egptr() - __rhs.eback();
__rhs.setg(
(char_type*)__rhs.__extbuf_min_, (char_type*)__rhs.__extbuf_min_ + __n, (char_type*)__rhs.__extbuf_min_ + __e);
} else if (__rhs.pbase() == (char_type*)__extbuf_min_) {
ptrdiff_t __n = __rhs.pptr() - __rhs.pbase();
ptrdiff_t __e = __rhs.epptr() - __rhs.pbase();
__rhs.setp((char_type*)__rhs.__extbuf_min_, (char_type*)__rhs.__extbuf_min_ + __e);
__rhs.__pbump(__n);
}
}
template <class _CharT, class _Traits>
inline _LIBCPP_HIDE_FROM_ABI void swap(basic_filebuf<_CharT, _Traits>& __x, basic_filebuf<_CharT, _Traits>& __y) {
__x.swap(__y);
}
template <class _CharT, class _Traits>
inline bool basic_filebuf<_CharT, _Traits>::is_open() const {
return __file_ != nullptr;
}
template <class _CharT, class _Traits>
const char* basic_filebuf<_CharT, _Traits>::__make_mdstring(ios_base::openmode __mode) _NOEXCEPT {
switch (__mode & ~ios_base::ate) {
case ios_base::out:
case ios_base::out | ios_base::trunc:
return "w" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::out | ios_base::app:
case ios_base::app:
return "a" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::in:
return "r" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::in | ios_base::out:
return "r+" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::in | ios_base::out | ios_base::trunc:
return "w+" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::in | ios_base::out | ios_base::app:
case ios_base::in | ios_base::app:
return "a+" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::out | ios_base::binary:
case ios_base::out | ios_base::trunc | ios_base::binary:
return "wb" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::out | ios_base::app | ios_base::binary:
case ios_base::app | ios_base::binary:
return "ab" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::in | ios_base::binary:
return "rb" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::in | ios_base::out | ios_base::binary:
return "r+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
return "w+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
case ios_base::in | ios_base::app | ios_base::binary:
return "a+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
# if _LIBCPP_STD_VER >= 23
case ios_base::out | ios_base::noreplace:
case ios_base::out | ios_base::trunc | ios_base::noreplace:
return "wx" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::in | ios_base::out | ios_base::trunc | ios_base::noreplace:
return "w+x" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::out | ios_base::binary | ios_base::noreplace:
case ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
return "wbx" _LIBCPP_FOPEN_CLOEXEC_MODE;
case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
return "w+bx" _LIBCPP_FOPEN_CLOEXEC_MODE;
# endif // _LIBCPP_STD_VER >= 23
default:
return nullptr;
}
__libcpp_unreachable();
}
# if _LIBCPP_HAS_OPEN_WITH_WCHAR
template <class _CharT, class _Traits>
const wchar_t* basic_filebuf<_CharT, _Traits>::__make_mdwstring(ios_base::openmode __mode) _NOEXCEPT {
switch (__mode & ~ios_base::ate) {
case ios_base::out:
case ios_base::out | ios_base::trunc:
return L"w";
case ios_base::out | ios_base::app:
case ios_base::app:
return L"a";
case ios_base::in:
return L"r";
case ios_base::in | ios_base::out:
return L"r+";
case ios_base::in | ios_base::out | ios_base::trunc:
return L"w+";
case ios_base::in | ios_base::out | ios_base::app:
case ios_base::in | ios_base::app:
return L"a+";
case ios_base::out | ios_base::binary:
case ios_base::out | ios_base::trunc | ios_base::binary:
return L"wb";
case ios_base::out | ios_base::app | ios_base::binary:
case ios_base::app | ios_base::binary:
return L"ab";
case ios_base::in | ios_base::binary:
return L"rb";
case ios_base::in | ios_base::out | ios_base::binary:
return L"r+b";
case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
return L"w+b";
case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
case ios_base::in | ios_base::app | ios_base::binary:
return L"a+b";
# if _LIBCPP_STD_VER >= 23
case ios_base::out | ios_base::noreplace:
case ios_base::out | ios_base::trunc | ios_base::noreplace:
return L"wx";
case ios_base::in | ios_base::out | ios_base::trunc | ios_base::noreplace:
return L"w+x";
case ios_base::out | ios_base::binary | ios_base::noreplace:
case ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
return L"wbx";
case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
return L"w+bx";
# endif // _LIBCPP_STD_VER >= 23
default:
return nullptr;
}
__libcpp_unreachable();
}
# endif
template <class _CharT, class _Traits>
basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) {
if (__file_)
return nullptr;
const char* __mdstr = __make_mdstring(__mode);
if (!__mdstr)
return nullptr;
return __do_open(fopen(__s, __mdstr), __mode);
}
template <class _CharT, class _Traits>
inline basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
if (__file_)
return nullptr;
const char* __mdstr = __make_mdstring(__mode);
if (!__mdstr)
return nullptr;
return __do_open(fdopen(__fd, __mdstr), __mode);
}
# if _LIBCPP_HAS_OPEN_WITH_WCHAR
// This is basically the same as the char* overload except that it uses _wfopen
// and long mode strings.
template <class _CharT, class _Traits>
basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) {
if (__file_)
return nullptr;
const wchar_t* __mdstr = __make_mdwstring(__mode);
if (!__mdstr)
return nullptr;
return __do_open(_wfopen(__s, __mdstr), __mode);
}
# endif
template <class _CharT, class _Traits>
inline basic_filebuf<_CharT, _Traits>*
basic_filebuf<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) {
return open(__s.c_str(), __mode);
}
template <class _CharT, class _Traits>
basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::close() {
basic_filebuf<_CharT, _Traits>* __rt = nullptr;
if (__file_) {
__rt = this;
unique_ptr<FILE, int (*)(FILE*)> __h(__file_, fclose);
if (sync())
__rt = nullptr;
if (fclose(__h.release()))
__rt = nullptr;
__file_ = nullptr;
setbuf(0, 0);
}
return __rt;
}
template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::underflow() {
if (__file_ == nullptr)
return traits_type::eof();
bool __initial = __read_mode();
char_type __1buf;
if (this->gptr() == nullptr)
this->setg(std::addressof(__1buf), std::addressof(__1buf) + 1, std::addressof(__1buf) + 1);
const size_t __unget_sz = __initial ? 0 : std::min<size_t>((this->egptr() - this->eback()) / 2, 4);
int_type __c = traits_type::eof();
if (this->gptr() == this->egptr()) {
std::memmove(this->eback(), this->egptr() - __unget_sz, __unget_sz * sizeof(char_type));
if (__always_noconv_) {
size_t __nmemb = static_cast<size_t>(this->egptr() - this->eback() - __unget_sz);
__nmemb = ::fread(this->eback() + __unget_sz, 1, __nmemb, __file_);
if (__nmemb != 0) {
this->setg(this->eback(), this->eback() + __unget_sz, this->eback() + __unget_sz + __nmemb);
__c = traits_type::to_int_type(*this->gptr());
}
} else {
if (__extbufend_ != __extbufnext_) {
_LIBCPP_ASSERT_NON_NULL(__extbufnext_ != nullptr, "underflow moving from nullptr");
_LIBCPP_ASSERT_NON_NULL(__extbuf_ != nullptr, "underflow moving into nullptr");
std::memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
}
__extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
__extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);
size_t __nmemb =
std::min(static_cast<size_t>(__ibs_ - __unget_sz), static_cast<size_t>(__extbufend_ - __extbufnext_));
codecvt_base::result __r;
__st_last_ = __st_;
size_t __nr = fread((void*)const_cast<char*>(__extbufnext_), 1, __nmemb, __file_);
if (__nr != 0) {
if (!__cv_)
std::__throw_bad_cast();
__extbufend_ = __extbufnext_ + __nr;
char_type* __inext;
__r = __cv_->in(
__st_, __extbuf_, __extbufend_, __extbufnext_, this->eback() + __unget_sz, this->eback() + __ibs_, __inext);
if (__r == codecvt_base::noconv) {
this->setg((char_type*)__extbuf_, (char_type*)__extbuf_, (char_type*)const_cast<char*>(__extbufend_));
__c = traits_type::to_int_type(*this->gptr());
} else if (__inext != this->eback() + __unget_sz) {
this->setg(this->eback(), this->eback() + __unget_sz, __inext);
__c = traits_type::to_int_type(*this->gptr());
}
}
}
} else
__c = traits_type::to_int_type(*this->gptr());
if (this->eback() == std::addressof(__1buf))
this->setg(nullptr, nullptr, nullptr);
return __c;
}
template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c) {
if (__file_ && this->eback() < this->gptr()) {
if (traits_type::eq_int_type(__c, traits_type::eof())) {
this->gbump(-1);
return traits_type::not_eof(__c);
}
if ((__om_ & ios_base::out) || traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1])) {
this->gbump(-1);
*this->gptr() = traits_type::to_char_type(__c);
return __c;
}
}
return traits_type::eof();
}
template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::overflow(int_type __c) {
if (__file_ == nullptr)
return traits_type::eof();
__write_mode();
char_type __1buf;
char_type* __pb_save = this->pbase();
char_type* __epb_save = this->epptr();
if (!traits_type::eq_int_type(__c, traits_type::eof())) {
if (this->pptr() == nullptr)
this->setp(std::addressof(__1buf), std::addressof(__1buf) + 1);
*this->pptr() = traits_type::to_char_type(__c);
this->pbump(1);
}
if (this->pptr() != this->pbase()) {
if (__always_noconv_) {
size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
if (std::fwrite(this->pbase(), sizeof(char_type), __nmemb, __file_) != __nmemb)
return traits_type::eof();
} else {
char* __extbe = __extbuf_;
codecvt_base::result __r;
do {
if (!__cv_)
std::__throw_bad_cast();
const char_type* __e;
__r = __cv_->out(__st_, this->pbase(), this->pptr(), __e, __extbuf_, __extbuf_ + __ebs_, __extbe);
if (__e == this->pbase())
return traits_type::eof();
if (__r == codecvt_base::noconv) {
size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
if (std::fwrite(this->pbase(), 1, __nmemb, __file_) != __nmemb)
return traits_type::eof();
} else if (__r == codecvt_base::ok || __r == codecvt_base::partial) {
size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
return traits_type::eof();
if (__r == codecvt_base::partial) {
this->setp(const_cast<char_type*>(__e), this->pptr());
this->__pbump(this->epptr() - this->pbase());
}
} else
return traits_type::eof();
} while (__r == codecvt_base::partial);
}
this->setp(__pb_save, __epb_save);
}
return traits_type::not_eof(__c);
}
template <class _CharT, class _Traits>
basic_streambuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::setbuf(char_type* __s, streamsize __n) {
this->setg(nullptr, nullptr, nullptr);
this->setp(nullptr, nullptr);
__request_unbuffered_mode(__s, __n);
if (__owns_eb_)
delete[] __extbuf_;
if (__owns_ib_)
delete[] __intbuf_;
__ebs_ = __n;
if (__ebs_ > sizeof(__extbuf_min_)) {
if (__always_noconv_ && __s) {
__extbuf_ = (char*)__s;
__owns_eb_ = false;
} else {
__extbuf_ = new char[__ebs_];
__owns_eb_ = true;
}
} else {
__extbuf_ = __extbuf_min_;
__ebs_ = sizeof(__extbuf_min_);
__owns_eb_ = false;
}
if (!__always_noconv_) {
__ibs_ = max<streamsize>(__n, sizeof(__extbuf_min_));
if (__s && __ibs_ > sizeof(__extbuf_min_)) {
__intbuf_ = __s;
__owns_ib_ = false;
} else {
__intbuf_ = new char_type[__ibs_];
__owns_ib_ = true;
}
} else {
__ibs_ = 0;
__intbuf_ = nullptr;
__owns_ib_ = false;
}
return this;
}
template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::pos_type
basic_filebuf<_CharT, _Traits>::seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode) {
if (!__cv_)
std::__throw_bad_cast();
int __width = __cv_->encoding();
if (__file_ == nullptr || (__width <= 0 && __off != 0) || sync())
return pos_type(off_type(-1));
// __width > 0 || __off == 0
int __whence;
switch (__way) {
case ios_base::beg:
__whence = SEEK_SET;
break;
case ios_base::cur:
__whence = SEEK_CUR;
break;
case ios_base::end:
__whence = SEEK_END;
break;
default:
return pos_type(off_type(-1));
}
if (__fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
return pos_type(off_type(-1));
pos_type __r = __ftell(__file_);
__r.state(__st_);
return __r;
}
template <class _CharT, class _Traits>
int basic_filebuf<_CharT, _Traits>::__fseek(FILE* __file, pos_type __offset, int __whence) {
# if defined(_LIBCPP_MSVCRT_LIKE)
return _fseeki64(__file, __offset, __whence);
# elif defined(_NEWLIB_VERSION)
return fseek(__file, __offset, __whence);
# else
return ::fseeko(__file, __offset, __whence);
# endif
}
template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::pos_type basic_filebuf<_CharT, _Traits>::__ftell(FILE* __file) {
# if defined(_LIBCPP_MSVCRT_LIKE)
return _ftelli64(__file);
# elif defined(_NEWLIB_VERSION)
return ftell(__file);
# else
return ftello(__file);
# endif
}
template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::pos_type
basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode) {
if (__file_ == nullptr || sync())
return pos_type(off_type(-1));
if (__fseek(__file_, __sp, SEEK_SET))
return pos_type(off_type(-1));
__st_ = __sp.state();
return __sp;
}
template <class _CharT, class _Traits>
int basic_filebuf<_CharT, _Traits>::sync() {
if (__file_ == nullptr)
return 0;
if (!__cv_)
std::__throw_bad_cast();
if (__cm_ & ios_base::out) {
if (this->pptr() != this->pbase())
if (overflow() == traits_type::eof())
return -1;
codecvt_base::result __r;
do {
char* __extbe;
__r = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe);
size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
return -1;
} while (__r == codecvt_base::partial);
if (__r == codecvt_base::error)
return -1;
if (fflush(__file_))
return -1;
} else if (__cm_ & ios_base::in) {