360 lines
10 KiB
C++
360 lines
10 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is dual licensed under the MIT and the University of Illinois Open
|
|
// Source Licenses. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___STD_STREAM
|
|
#define _LIBCPP___STD_STREAM
|
|
|
|
#include <__config>
|
|
#include <ostream>
|
|
#include <istream>
|
|
#include <__locale>
|
|
#include <cstdio>
|
|
|
|
#include <__undef_min_max>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
#pragma GCC system_header
|
|
#endif
|
|
|
|
_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_;
|
|
|
|
__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());
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
char __extbuf[__limit];
|
|
int __nread = _VSTD::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;
|
|
if (__always_noconv_)
|
|
__1buf = static_cast<char_type>(__extbuf[0]);
|
|
else
|
|
{
|
|
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 _VSTD::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 _VSTD::codecvt_base::noconv:
|
|
__1buf = static_cast<char_type>(__extbuf[0]);
|
|
break;
|
|
}
|
|
} while (__r == _VSTD::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 (__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 _VSTD::codecvt_base::ok:
|
|
break;
|
|
case _VSTD::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_;
|
|
|
|
__stdoutbuf(const __stdoutbuf&);
|
|
__stdoutbuf& operator=(const __stdoutbuf&);
|
|
};
|
|
|
|
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())
|
|
{
|
|
}
|
|
|
|
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 (fwrite(&__1buf, sizeof(char_type), 1, __file_) != 1)
|
|
return traits_type::eof();
|
|
}
|
|
else
|
|
{
|
|
char* __extbe = __extbuf;
|
|
codecvt_base::result __r;
|
|
char_type* pbase = &__1buf;
|
|
char_type* pptr = pbase + 1;
|
|
char_type* epptr = pptr;
|
|
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 = (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)
|
|
{
|
|
if (__always_noconv_)
|
|
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
|
|
|
|
#endif // _LIBCPP___STD_STREAM
|