// -*- 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_STD_STREAM_H
#define _LIBCPP_STD_STREAM_H
#include <__config>
#include <__locale>
#include <cstdio>
#include <istream>
#include <ostream>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
static const int __limit = 8;
// __stdinbuf
template <class _CharT>
class _LIBCPP_HIDDEN __stdinbuf : public basic_streambuf<_CharT, char_traits<_CharT> > {
public:
typedef _CharT char_type;
typedef char_traits<char_type> 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;
__stdinbuf(FILE* __fp, state_type* __st);
protected:
virtual int_type underflow();
virtual int_type uflow();
virtual int_type pbackfail(int_type __c = traits_type::eof());
virtual void imbue(const locale& __loc);
private:
FILE* __file_;
const codecvt<char_type, char, state_type>* __cv_;
state_type* __st_;
int __encoding_;
int_type __last_consumed_;
bool __last_consumed_is_next_;
bool __always_noconv_;
#if defined(_LIBCPP_WIN32API)
static constexpr bool __is_win32api_wide_char = !is_same_v<_CharT, char>;
#else
static constexpr bool __is_win32api_wide_char = false;
#endif
__stdinbuf(const __stdinbuf&);
__stdinbuf& operator=(const __stdinbuf&);
int_type __getchar(bool __consume);
};
template <class _CharT>
__stdinbuf<_CharT>::__stdinbuf(FILE* __fp, state_type* __st)
: __file_(__fp), __st_(__st), __last_consumed_(traits_type::eof()), __last_consumed_is_next_(false) {
imbue(this->getloc());
// On Windows, in wchar_t mode, ignore the codecvt from the locale by
// default and assume noconv; this passes wchar_t through unmodified from
// getwc. If the user sets a custom locale with imbue(), that gets honored,
// the IO is done with getc() and converted with the provided codecvt.
if constexpr (__is_win32api_wide_char)
__always_noconv_ = true;
}
template <class _CharT>
void __stdinbuf<_CharT>::imbue(const locale& __loc) {
__cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
__encoding_ = __cv_->encoding();
__always_noconv_ = __cv_->always_noconv();
if (__encoding_ > __limit)
__throw_runtime_error("unsupported locale for standard input");
}
template <class _CharT>
typename __stdinbuf<_CharT>::int_type __stdinbuf<_CharT>::underflow() {
return __getchar(false);
}
template <class _CharT>
typename __stdinbuf<_CharT>::int_type __stdinbuf<_CharT>::uflow() {
return __getchar(true);
}
inline bool __do_getc(FILE* __fp, char* __pbuf) {
int __c = getc(__fp);
if (__c == EOF)
return false;
*__pbuf = static_cast<char>(__c);
return true;
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
inline bool __do_getc(FILE* __fp, wchar_t* __pbuf) {
wint_t __c = getwc(__fp);
if (__c == WEOF)
return false;
*__pbuf = static_cast<wchar_t>(__c);
return true;
}
#endif
inline bool __do_ungetc(int __c, FILE* __fp, char __dummy) {
if (ungetc(__c, __fp) == EOF)
return false;
return true;
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
inline bool __do_ungetc(std::wint_t __c, FILE* __fp, wchar_t __dummy) {
if (ungetwc(__c, __fp) == WEOF)
return false;
return true;
}
#endif
template <class _CharT>
typename __stdinbuf<_CharT>::int_type __stdinbuf<_CharT>::__getchar(bool __consume) {
if (__last_consumed_is_next_) {
int_type __result = __last_consumed_;
if (__consume) {
__last_consumed_ = traits_type::eof();
__last_consumed_is_next_ = false;
}
return __result;
}
if (__always_noconv_) {
char_type __1buf;
if (!__do_getc(__file_, &__1buf))
return traits_type::eof();
if (!__consume) {
if (!__do_ungetc(traits_type::to_int_type(__1buf), __file_, __1buf))
return traits_type::eof();
} else
__last_consumed_ = traits_type::to_int_type(__1buf);
return traits_type::to_int_type(__1buf);
}
char __extbuf[__limit];
int __nread = std::max(1, __encoding_);
for (int __i = 0; __i < __nread; ++__i) {
int __c = getc(__file_);
if (__c == EOF)
return traits_type::eof();
__extbuf[__i] = static_cast<char>(__c);
}
char_type __1buf;
const char* __enxt;
char_type* __inxt;
codecvt_base::result __r;
do {
state_type __sv_st = *__st_;
__r = __cv_->in(*__st_, __extbuf, __extbuf + __nread, __enxt, &__1buf, &__1buf + 1, __inxt);
switch (__r) {
case std::codecvt_base::ok:
break;
case codecvt_base::partial:
*__st_ = __sv_st;
if (__nread == sizeof(__extbuf))
return traits_type::eof();
{
int __c = getc(__file_);
if (__c == EOF)
return traits_type::eof();
__extbuf[__nread] = static_cast<char>(__c);
}
++__nread;
break;
case codecvt_base::error:
return traits_type::eof();
case std::codecvt_base::noconv:
__1buf = static_cast<char_type>(__extbuf[0]);
break;
}
} while (__r == std::codecvt_base::partial);
if (!__consume) {
for (int __i = __nread; __i > 0;) {
if (ungetc(traits_type::to_int_type(__extbuf[--__i]), __file_) == EOF)
return traits_type::eof();
}
} else
__last_consumed_ = traits_type::to_int_type(__1buf);
return traits_type::to_int_type(__1buf);
}
template <class _CharT>
typename __stdinbuf<_CharT>::int_type __stdinbuf<_CharT>::pbackfail(int_type __c) {
if (traits_type::eq_int_type(__c, traits_type::eof())) {
if (!__last_consumed_is_next_) {
__c = __last_consumed_;
__last_consumed_is_next_ = !traits_type::eq_int_type(__last_consumed_, traits_type::eof());
}
return __c;
}
if (__always_noconv_ && __last_consumed_is_next_) {
if (!__do_ungetc(__last_consumed_, __file_, traits_type::to_char_type(__last_consumed_)))
return traits_type::eof();
} else if (__last_consumed_is_next_) {
char __extbuf[__limit];
char* __enxt;
const char_type __ci = traits_type::to_char_type(__last_consumed_);
const char_type* __inxt;
switch (__cv_->out(*__st_, &__ci, &__ci + 1, __inxt, __extbuf, __extbuf + sizeof(__extbuf), __enxt)) {
case std::codecvt_base::ok:
break;
case std::codecvt_base::noconv:
__extbuf[0] = static_cast<char>(__last_consumed_);
__enxt = __extbuf + 1;
break;
case codecvt_base::partial:
case codecvt_base::error:
return traits_type::eof();
}
while (__enxt > __extbuf)
if (ungetc(*--__enxt, __file_) == EOF)
return traits_type::eof();
}
__last_consumed_ = __c;
__last_consumed_is_next_ = true;
return __c;
}
// __stdoutbuf
template <class _CharT>
class _LIBCPP_HIDDEN __stdoutbuf : public basic_streambuf<_CharT, char_traits<_CharT> > {
public:
typedef _CharT char_type;
typedef char_traits<char_type> 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;
__stdoutbuf(FILE* __fp, state_type* __st);
protected:
virtual int_type overflow(int_type __c = traits_type::eof());
virtual streamsize xsputn(const char_type* __s, streamsize __n);
virtual int sync();
virtual void imbue(const locale& __loc);
private:
FILE* __file_;
const codecvt<char_type, char, state_type>* __cv_;
state_type* __st_;
bool __always_noconv_;
#if defined(_LIBCPP_WIN32API)
static constexpr bool __is_win32api_wide_char = !is_same_v<_CharT, char>;
#else
static constexpr bool __is_win32api_wide_char = false;
#endif
__stdoutbuf(const __stdoutbuf&);
__stdoutbuf& operator=(const __stdoutbuf&);
_LIBCPP_EXPORTED_FROM_ABI friend FILE* __get_ostream_file(ostream&);
};
template <class _CharT>
__stdoutbuf<_CharT>::__stdoutbuf(FILE* __fp, state_type* __st)
: __file_(__fp),
__cv_(&use_facet<codecvt<char_type, char, state_type> >(this->getloc())),
__st_(__st),
__always_noconv_(__cv_->always_noconv()) {
// On Windows, in wchar_t mode, ignore the codecvt from the locale by
// default and assume noconv; this passes wchar_t through unmodified to
// fputwc, which handles it correctly depending on the actual mode of the
// output stream. If the user sets a custom locale with imbue(), that
// gets honored.
if constexpr (__is_win32api_wide_char)
__always_noconv_ = true;
}
inline bool __do_fputc(char __c, FILE* __fp) {
if (fwrite(&__c, sizeof(__c), 1, __fp) != 1)
return false;
return true;
}
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
inline bool __do_fputc(wchar_t __c, FILE* __fp) {
// fputwc works regardless of wide/narrow mode of stdout, while
// fwrite of wchar_t only works if the stream actually has been set
// into wide mode.
if (fputwc(__c, __fp) == WEOF)
return false;
return true;
}
#endif
template <class _CharT>
typename __stdoutbuf<_CharT>::int_type __stdoutbuf<_CharT>::overflow(int_type __c) {
char __extbuf[__limit];
char_type __1buf;
if (!traits_type::eq_int_type(__c, traits_type::eof())) {
__1buf = traits_type::to_char_type(__c);
if (__always_noconv_) {
if (!__do_fputc(__1buf, __file_))
return traits_type::eof();
} else {
char* __extbe = __extbuf;
codecvt_base::result __r;
char_type* pbase = &__1buf;
char_type* pptr = pbase + 1;
do {
const char_type* __e;
__r = __cv_->out(*__st_, pbase, pptr, __e, __extbuf, __extbuf + sizeof(__extbuf), __extbe);
if (__e == pbase)
return traits_type::eof();
if (__r == codecvt_base::noconv) {
if (fwrite(pbase, 1, 1, __file_) != 1)
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) {
pbase = const_cast<char_type*>(__e);
}
} else
return traits_type::eof();
} while (__r == codecvt_base::partial);
}
}
return traits_type::not_eof(__c);
}
template <class _CharT>
streamsize __stdoutbuf<_CharT>::xsputn(const char_type* __s, streamsize __n) {
// For wchar_t on Windows, don't call fwrite(), but write characters one
// at a time with fputwc(); that works both when stdout is in the default
// mode and when it is set to Unicode mode.
if (__always_noconv_ && !__is_win32api_wide_char)
return fwrite(__s, sizeof(char_type), __n, __file_);
streamsize __i = 0;
for (; __i < __n; ++__i, ++__s)
if (overflow(traits_type::to_int_type(*__s)) == traits_type::eof())
break;
return __i;
}
template <class _CharT>
int __stdoutbuf<_CharT>::sync() {
char __extbuf[__limit];
codecvt_base::result __r;
do {
char* __extbe;
__r = __cv_->unshift(*__st_, __extbuf, __extbuf + sizeof(__extbuf), __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;
return 0;
}
template <class _CharT>
void __stdoutbuf<_CharT>::imbue(const locale& __loc) {
sync();
__cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
__always_noconv_ = __cv_->always_noconv();
}
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP_STD_STREAM_H
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