5ea5d31f6d
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@188077 91177308-0d34-0410-b5e6-96231b3b80d8
360 lines
10 KiB
C++
360 lines
10 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___STD_STREAM
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#define _LIBCPP___STD_STREAM
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#include <__config>
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#include <ostream>
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#include <istream>
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#include <__locale>
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#include <cstdio>
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#include <__undef_min_max>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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static const int __limit = 8;
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// __stdinbuf
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template <class _CharT>
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class _LIBCPP_HIDDEN __stdinbuf
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: public basic_streambuf<_CharT, char_traits<_CharT> >
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{
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public:
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typedef _CharT char_type;
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typedef char_traits<char_type> traits_type;
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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typedef typename traits_type::state_type state_type;
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__stdinbuf(FILE* __fp, state_type* __st);
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protected:
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virtual int_type underflow();
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virtual int_type uflow();
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virtual int_type pbackfail(int_type __c = traits_type::eof());
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virtual void imbue(const locale& __loc);
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private:
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FILE* __file_;
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const codecvt<char_type, char, state_type>* __cv_;
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state_type* __st_;
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int __encoding_;
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int_type __last_consumed_;
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bool __last_consumed_is_next_;
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bool __always_noconv_;
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__stdinbuf(const __stdinbuf&);
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__stdinbuf& operator=(const __stdinbuf&);
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int_type __getchar(bool __consume);
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};
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template <class _CharT>
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__stdinbuf<_CharT>::__stdinbuf(FILE* __fp, state_type* __st)
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: __file_(__fp),
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__st_(__st),
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__last_consumed_(traits_type::eof()),
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__last_consumed_is_next_(false)
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{
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imbue(this->getloc());
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}
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template <class _CharT>
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void
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__stdinbuf<_CharT>::imbue(const locale& __loc)
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{
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__cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
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__encoding_ = __cv_->encoding();
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__always_noconv_ = __cv_->always_noconv();
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if (__encoding_ > __limit)
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__throw_runtime_error("unsupported locale for standard input");
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}
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template <class _CharT>
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typename __stdinbuf<_CharT>::int_type
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__stdinbuf<_CharT>::underflow()
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{
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return __getchar(false);
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}
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template <class _CharT>
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typename __stdinbuf<_CharT>::int_type
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__stdinbuf<_CharT>::uflow()
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{
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return __getchar(true);
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}
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template <class _CharT>
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typename __stdinbuf<_CharT>::int_type
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__stdinbuf<_CharT>::__getchar(bool __consume)
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{
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if (__last_consumed_is_next_)
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{
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int_type __result = __last_consumed_;
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if (__consume)
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{
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__last_consumed_ = traits_type::eof();
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__last_consumed_is_next_ = false;
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}
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return __result;
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}
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char __extbuf[__limit];
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int __nread = _VSTD::max(1, __encoding_);
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for (int __i = 0; __i < __nread; ++__i)
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{
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int __c = getc(__file_);
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if (__c == EOF)
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return traits_type::eof();
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__extbuf[__i] = static_cast<char>(__c);
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}
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char_type __1buf;
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if (__always_noconv_)
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__1buf = static_cast<char_type>(__extbuf[0]);
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else
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{
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const char* __enxt;
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char_type* __inxt;
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codecvt_base::result __r;
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do
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{
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state_type __sv_st = *__st_;
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__r = __cv_->in(*__st_, __extbuf, __extbuf + __nread, __enxt,
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&__1buf, &__1buf + 1, __inxt);
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switch (__r)
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{
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case _VSTD::codecvt_base::ok:
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break;
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case codecvt_base::partial:
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*__st_ = __sv_st;
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if (__nread == sizeof(__extbuf))
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return traits_type::eof();
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{
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int __c = getc(__file_);
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if (__c == EOF)
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return traits_type::eof();
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__extbuf[__nread] = static_cast<char>(__c);
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}
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++__nread;
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break;
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case codecvt_base::error:
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return traits_type::eof();
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case _VSTD::codecvt_base::noconv:
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__1buf = static_cast<char_type>(__extbuf[0]);
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break;
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}
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} while (__r == _VSTD::codecvt_base::partial);
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}
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if (!__consume)
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{
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for (int __i = __nread; __i > 0;)
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{
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if (ungetc(traits_type::to_int_type(__extbuf[--__i]), __file_) == EOF)
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return traits_type::eof();
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}
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}
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else
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__last_consumed_ = traits_type::to_int_type(__1buf);
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return traits_type::to_int_type(__1buf);
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}
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template <class _CharT>
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typename __stdinbuf<_CharT>::int_type
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__stdinbuf<_CharT>::pbackfail(int_type __c)
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{
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if (traits_type::eq_int_type(__c, traits_type::eof()))
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{
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if (!__last_consumed_is_next_)
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{
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__c = __last_consumed_;
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__last_consumed_is_next_ = !traits_type::eq_int_type(__last_consumed_,
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traits_type::eof());
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}
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return __c;
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}
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if (__last_consumed_is_next_)
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{
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char __extbuf[__limit];
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char* __enxt;
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const char_type __ci = traits_type::to_char_type(__last_consumed_);
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const char_type* __inxt;
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switch (__cv_->out(*__st_, &__ci, &__ci + 1, __inxt,
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__extbuf, __extbuf + sizeof(__extbuf), __enxt))
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{
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case _VSTD::codecvt_base::ok:
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break;
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case _VSTD::codecvt_base::noconv:
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__extbuf[0] = static_cast<char>(__last_consumed_);
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__enxt = __extbuf + 1;
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break;
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case codecvt_base::partial:
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case codecvt_base::error:
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return traits_type::eof();
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}
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while (__enxt > __extbuf)
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if (ungetc(*--__enxt, __file_) == EOF)
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return traits_type::eof();
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}
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__last_consumed_ = __c;
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__last_consumed_is_next_ = true;
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return __c;
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}
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// __stdoutbuf
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template <class _CharT>
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class _LIBCPP_HIDDEN __stdoutbuf
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: public basic_streambuf<_CharT, char_traits<_CharT> >
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{
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public:
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typedef _CharT char_type;
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typedef char_traits<char_type> traits_type;
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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typedef typename traits_type::state_type state_type;
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__stdoutbuf(FILE* __fp, state_type* __st);
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protected:
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virtual int_type overflow (int_type __c = traits_type::eof());
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virtual streamsize xsputn(const char_type* __s, streamsize __n);
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virtual int sync();
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virtual void imbue(const locale& __loc);
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private:
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FILE* __file_;
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const codecvt<char_type, char, state_type>* __cv_;
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state_type* __st_;
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bool __always_noconv_;
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__stdoutbuf(const __stdoutbuf&);
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__stdoutbuf& operator=(const __stdoutbuf&);
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};
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template <class _CharT>
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__stdoutbuf<_CharT>::__stdoutbuf(FILE* __fp, state_type* __st)
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: __file_(__fp),
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__cv_(&use_facet<codecvt<char_type, char, state_type> >(this->getloc())),
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__st_(__st),
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__always_noconv_(__cv_->always_noconv())
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{
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}
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template <class _CharT>
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typename __stdoutbuf<_CharT>::int_type
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__stdoutbuf<_CharT>::overflow(int_type __c)
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{
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char __extbuf[__limit];
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char_type __1buf;
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if (!traits_type::eq_int_type(__c, traits_type::eof()))
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{
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__1buf = traits_type::to_char_type(__c);
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if (__always_noconv_)
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{
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if (fwrite(&__1buf, sizeof(char_type), 1, __file_) != 1)
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return traits_type::eof();
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}
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else
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{
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char* __extbe = __extbuf;
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codecvt_base::result __r;
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char_type* pbase = &__1buf;
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char_type* pptr = pbase + 1;
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char_type* epptr = pptr;
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do
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{
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const char_type* __e;
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__r = __cv_->out(*__st_, pbase, pptr, __e,
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__extbuf,
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__extbuf + sizeof(__extbuf),
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__extbe);
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if (__e == pbase)
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return traits_type::eof();
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if (__r == codecvt_base::noconv)
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{
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if (fwrite(pbase, 1, 1, __file_) != 1)
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return traits_type::eof();
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}
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else if (__r == codecvt_base::ok || __r == codecvt_base::partial)
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{
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size_t __nmemb = static_cast<size_t>(__extbe - __extbuf);
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if (fwrite(__extbuf, 1, __nmemb, __file_) != __nmemb)
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return traits_type::eof();
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if (__r == codecvt_base::partial)
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{
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pbase = (char_type*)__e;
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}
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}
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else
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return traits_type::eof();
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} while (__r == codecvt_base::partial);
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}
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}
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return traits_type::not_eof(__c);
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}
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template <class _CharT>
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streamsize
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__stdoutbuf<_CharT>::xsputn(const char_type* __s, streamsize __n)
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{
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if (__always_noconv_)
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return fwrite(__s, sizeof(char_type), __n, __file_);
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streamsize __i = 0;
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for (; __i < __n; ++__i, ++__s)
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if (overflow(traits_type::to_int_type(*__s)) == traits_type::eof())
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break;
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return __i;
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}
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template <class _CharT>
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int
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__stdoutbuf<_CharT>::sync()
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{
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char __extbuf[__limit];
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codecvt_base::result __r;
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do
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{
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char* __extbe;
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__r = __cv_->unshift(*__st_, __extbuf,
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__extbuf + sizeof(__extbuf),
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__extbe);
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size_t __nmemb = static_cast<size_t>(__extbe - __extbuf);
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if (fwrite(__extbuf, 1, __nmemb, __file_) != __nmemb)
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return -1;
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} while (__r == codecvt_base::partial);
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if (__r == codecvt_base::error)
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return -1;
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if (fflush(__file_))
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return -1;
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return 0;
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}
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template <class _CharT>
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void
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__stdoutbuf<_CharT>::imbue(const locale& __loc)
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{
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sync();
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__cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
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__always_noconv_ = __cv_->always_noconv();
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___STD_STREAM
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