501 lines
14 KiB
C++
501 lines
14 KiB
C++
// -*- C++ -*-
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//===------------------------- streambuf ----------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_STEAMBUF
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#define _LIBCPP_STEAMBUF
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/*
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streambuf synopsis
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namespace std
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{
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template <class charT, class traits = char_traits<charT> >
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class basic_streambuf
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{
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public:
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// types:
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typedef charT char_type;
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typedef traits 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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virtual ~basic_streambuf();
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// 27.6.2.2.1 locales:
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locale pubimbue(const locale& loc);
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locale getloc() const;
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// 27.6.2.2.2 buffer and positioning:
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basic_streambuf* pubsetbuf(char_type* s, streamsize n);
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pos_type pubseekoff(off_type off, ios_base::seekdir way,
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ios_base::openmode which = ios_base::in | ios_base::out);
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pos_type pubseekpos(pos_type sp,
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ios_base::openmode which = ios_base::in | ios_base::out);
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int pubsync();
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// Get and put areas:
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// 27.6.2.2.3 Get area:
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streamsize in_avail();
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int_type snextc();
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int_type sbumpc();
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int_type sgetc();
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streamsize sgetn(char_type* s, streamsize n);
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// 27.6.2.2.4 Putback:
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int_type sputbackc(char_type c);
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int_type sungetc();
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// 27.6.2.2.5 Put area:
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int_type sputc(char_type c);
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streamsize sputn(const char_type* s, streamsize n);
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protected:
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basic_streambuf();
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basic_streambuf(const basic_streambuf& rhs);
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basic_streambuf& operator=(const basic_streambuf& rhs);
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void swap(basic_streambuf& rhs);
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// 27.6.2.3.2 Get area:
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char_type* eback() const;
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char_type* gptr() const;
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char_type* egptr() const;
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void gbump(int n);
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void setg(char_type* gbeg, char_type* gnext, char_type* gend);
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// 27.6.2.3.3 Put area:
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char_type* pbase() const;
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char_type* pptr() const;
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char_type* epptr() const;
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void pbump(int n);
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void setp(char_type* pbeg, char_type* pend);
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// 27.6.2.4 virtual functions:
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// 27.6.2.4.1 Locales:
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virtual void imbue(const locale& loc);
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// 27.6.2.4.2 Buffer management and positioning:
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virtual basic_streambuf* setbuf(char_type* s, streamsize n);
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virtual pos_type seekoff(off_type off, ios_base::seekdir way,
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ios_base::openmode which = ios_base::in | ios_base::out);
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virtual pos_type seekpos(pos_type sp,
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ios_base::openmode which = ios_base::in | ios_base::out);
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virtual int sync();
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// 27.6.2.4.3 Get area:
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virtual streamsize showmanyc();
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virtual streamsize xsgetn(char_type* s, streamsize n);
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virtual int_type underflow();
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virtual int_type uflow();
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// 27.6.2.4.4 Putback:
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virtual int_type pbackfail(int_type c = traits_type::eof());
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// 27.6.2.4.5 Put area:
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virtual streamsize xsputn(const char_type* s, streamsize n);
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virtual int_type overflow (int_type c = traits_type::eof());
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};
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} // std
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*/
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#include <__config>
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#include <iosfwd>
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#include <ios>
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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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _CharT, class _Traits>
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class _LIBCPP_TEMPLATE_VIS basic_streambuf
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{
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public:
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// types:
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typedef _CharT char_type;
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typedef _Traits 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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static_assert((is_same<_CharT, typename traits_type::char_type>::value),
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"traits_type::char_type must be the same type as CharT");
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virtual ~basic_streambuf();
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// 27.6.2.2.1 locales:
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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locale pubimbue(const locale& __loc) {
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imbue(__loc);
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locale __r = __loc_;
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__loc_ = __loc;
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return __r;
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}
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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locale getloc() const { return __loc_; }
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// 27.6.2.2.2 buffer and positioning:
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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basic_streambuf* pubsetbuf(char_type* __s, streamsize __n)
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{ return setbuf(__s, __n); }
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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pos_type pubseekoff(off_type __off, ios_base::seekdir __way,
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ios_base::openmode __which = ios_base::in | ios_base::out)
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{ return seekoff(__off, __way, __which); }
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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pos_type pubseekpos(pos_type __sp,
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ios_base::openmode __which = ios_base::in | ios_base::out)
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{ return seekpos(__sp, __which); }
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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int pubsync() { return sync(); }
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// Get and put areas:
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// 27.6.2.2.3 Get area:
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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streamsize in_avail() {
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if (__ninp_ < __einp_)
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return static_cast<streamsize>(__einp_ - __ninp_);
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return showmanyc();
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}
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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int_type snextc() {
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if (sbumpc() == traits_type::eof())
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return traits_type::eof();
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return sgetc();
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}
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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int_type sbumpc() {
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if (__ninp_ == __einp_)
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return uflow();
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return traits_type::to_int_type(*__ninp_++);
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}
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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int_type sgetc() {
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if (__ninp_ == __einp_)
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return underflow();
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return traits_type::to_int_type(*__ninp_);
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}
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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streamsize sgetn(char_type* __s, streamsize __n)
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{ return xsgetn(__s, __n); }
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// 27.6.2.2.4 Putback:
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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int_type sputbackc(char_type __c) {
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if (__binp_ == __ninp_ || !traits_type::eq(__c, __ninp_[-1]))
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return pbackfail(traits_type::to_int_type(__c));
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return traits_type::to_int_type(*--__ninp_);
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}
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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int_type sungetc() {
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if (__binp_ == __ninp_)
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return pbackfail();
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return traits_type::to_int_type(*--__ninp_);
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}
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// 27.6.2.2.5 Put area:
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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int_type sputc(char_type __c) {
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if (__nout_ == __eout_)
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return overflow(traits_type::to_int_type(__c));
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*__nout_++ = __c;
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return traits_type::to_int_type(__c);
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}
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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streamsize sputn(const char_type* __s, streamsize __n)
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{ return xsputn(__s, __n); }
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protected:
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basic_streambuf();
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basic_streambuf(const basic_streambuf& __rhs);
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basic_streambuf& operator=(const basic_streambuf& __rhs);
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void swap(basic_streambuf& __rhs);
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// 27.6.2.3.2 Get area:
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_LIBCPP_INLINE_VISIBILITY char_type* eback() const {return __binp_;}
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_LIBCPP_INLINE_VISIBILITY char_type* gptr() const {return __ninp_;}
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_LIBCPP_INLINE_VISIBILITY char_type* egptr() const {return __einp_;}
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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void gbump(int __n) { __ninp_ += __n; }
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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void setg(char_type* __gbeg, char_type* __gnext, char_type* __gend) {
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__binp_ = __gbeg;
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__ninp_ = __gnext;
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__einp_ = __gend;
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}
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// 27.6.2.3.3 Put area:
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_LIBCPP_INLINE_VISIBILITY char_type* pbase() const {return __bout_;}
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_LIBCPP_INLINE_VISIBILITY char_type* pptr() const {return __nout_;}
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_LIBCPP_INLINE_VISIBILITY char_type* epptr() const {return __eout_;}
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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void pbump(int __n) { __nout_ += __n; }
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_LIBCPP_INLINE_VISIBILITY
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void __pbump(streamsize __n) { __nout_ += __n; }
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inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
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void setp(char_type* __pbeg, char_type* __pend) {
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__bout_ = __nout_ = __pbeg;
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__eout_ = __pend;
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}
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// 27.6.2.4 virtual functions:
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// 27.6.2.4.1 Locales:
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virtual void imbue(const locale& __loc);
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// 27.6.2.4.2 Buffer management and positioning:
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virtual basic_streambuf* setbuf(char_type* __s, streamsize __n);
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virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
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ios_base::openmode __which = ios_base::in | ios_base::out);
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virtual pos_type seekpos(pos_type __sp,
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ios_base::openmode __which = ios_base::in | ios_base::out);
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virtual int sync();
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// 27.6.2.4.3 Get area:
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virtual streamsize showmanyc();
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virtual streamsize xsgetn(char_type* __s, streamsize __n);
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virtual int_type underflow();
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virtual int_type uflow();
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// 27.6.2.4.4 Putback:
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virtual int_type pbackfail(int_type __c = traits_type::eof());
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// 27.6.2.4.5 Put area:
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virtual streamsize xsputn(const char_type* __s, streamsize __n);
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virtual int_type overflow(int_type __c = traits_type::eof());
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private:
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locale __loc_;
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char_type* __binp_;
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char_type* __ninp_;
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char_type* __einp_;
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char_type* __bout_;
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char_type* __nout_;
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char_type* __eout_;
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};
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template <class _CharT, class _Traits>
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basic_streambuf<_CharT, _Traits>::~basic_streambuf()
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{
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}
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template <class _CharT, class _Traits>
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basic_streambuf<_CharT, _Traits>::basic_streambuf()
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: __binp_(0),
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__ninp_(0),
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__einp_(0),
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__bout_(0),
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__nout_(0),
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__eout_(0)
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{
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}
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template <class _CharT, class _Traits>
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basic_streambuf<_CharT, _Traits>::basic_streambuf(const basic_streambuf& __sb)
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: __loc_(__sb.__loc_),
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__binp_(__sb.__binp_),
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__ninp_(__sb.__ninp_),
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__einp_(__sb.__einp_),
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__bout_(__sb.__bout_),
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__nout_(__sb.__nout_),
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__eout_(__sb.__eout_)
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{
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}
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template <class _CharT, class _Traits>
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basic_streambuf<_CharT, _Traits>&
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basic_streambuf<_CharT, _Traits>::operator=(const basic_streambuf& __sb)
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{
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__loc_ = __sb.__loc_;
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__binp_ = __sb.__binp_;
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__ninp_ = __sb.__ninp_;
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__einp_ = __sb.__einp_;
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__bout_ = __sb.__bout_;
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__nout_ = __sb.__nout_;
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__eout_ = __sb.__eout_;
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return *this;
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}
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template <class _CharT, class _Traits>
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void
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basic_streambuf<_CharT, _Traits>::swap(basic_streambuf& __sb)
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{
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_VSTD::swap(__loc_, __sb.__loc_);
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_VSTD::swap(__binp_, __sb.__binp_);
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_VSTD::swap(__ninp_, __sb.__ninp_);
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_VSTD::swap(__einp_, __sb.__einp_);
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_VSTD::swap(__bout_, __sb.__bout_);
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_VSTD::swap(__nout_, __sb.__nout_);
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_VSTD::swap(__eout_, __sb.__eout_);
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}
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template <class _CharT, class _Traits>
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void
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basic_streambuf<_CharT, _Traits>::imbue(const locale&)
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{
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}
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template <class _CharT, class _Traits>
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basic_streambuf<_CharT, _Traits>*
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basic_streambuf<_CharT, _Traits>::setbuf(char_type*, streamsize)
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{
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return this;
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}
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template <class _CharT, class _Traits>
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typename basic_streambuf<_CharT, _Traits>::pos_type
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basic_streambuf<_CharT, _Traits>::seekoff(off_type, ios_base::seekdir,
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ios_base::openmode)
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{
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return pos_type(off_type(-1));
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}
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template <class _CharT, class _Traits>
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typename basic_streambuf<_CharT, _Traits>::pos_type
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basic_streambuf<_CharT, _Traits>::seekpos(pos_type, ios_base::openmode)
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{
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return pos_type(off_type(-1));
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}
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template <class _CharT, class _Traits>
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int
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basic_streambuf<_CharT, _Traits>::sync()
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{
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return 0;
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}
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template <class _CharT, class _Traits>
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streamsize
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basic_streambuf<_CharT, _Traits>::showmanyc()
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{
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return 0;
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}
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template <class _CharT, class _Traits>
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streamsize
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basic_streambuf<_CharT, _Traits>::xsgetn(char_type* __s, streamsize __n)
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{
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const int_type __eof = traits_type::eof();
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int_type __c;
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streamsize __i = 0;
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while(__i < __n)
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{
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if (__ninp_ < __einp_)
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{
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const streamsize __len = _VSTD::min(static_cast<streamsize>(INT_MAX),
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_VSTD::min(__einp_ - __ninp_, __n - __i));
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traits_type::copy(__s, __ninp_, __len);
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__s += __len;
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__i += __len;
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this->gbump(__len);
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}
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else if ((__c = uflow()) != __eof)
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{
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*__s = traits_type::to_char_type(__c);
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++__s;
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++__i;
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}
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else
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break;
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}
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return __i;
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}
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template <class _CharT, class _Traits>
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typename basic_streambuf<_CharT, _Traits>::int_type
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basic_streambuf<_CharT, _Traits>::underflow()
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{
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return traits_type::eof();
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}
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template <class _CharT, class _Traits>
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typename basic_streambuf<_CharT, _Traits>::int_type
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basic_streambuf<_CharT, _Traits>::uflow()
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{
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if (underflow() == traits_type::eof())
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return traits_type::eof();
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return traits_type::to_int_type(*__ninp_++);
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}
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template <class _CharT, class _Traits>
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typename basic_streambuf<_CharT, _Traits>::int_type
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basic_streambuf<_CharT, _Traits>::pbackfail(int_type)
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{
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return traits_type::eof();
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}
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template <class _CharT, class _Traits>
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streamsize
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basic_streambuf<_CharT, _Traits>::xsputn(const char_type* __s, streamsize __n)
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{
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streamsize __i = 0;
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int_type __eof = traits_type::eof();
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while( __i < __n)
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{
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if (__nout_ >= __eout_)
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{
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if (overflow(traits_type::to_int_type(*__s)) == __eof)
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break;
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++__s;
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++__i;
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}
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else
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{
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streamsize __chunk_size = _VSTD::min(__eout_ - __nout_, __n - __i);
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traits_type::copy(__nout_, __s, __chunk_size);
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__nout_ += __chunk_size;
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__s += __chunk_size;
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__i += __chunk_size;
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}
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}
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return __i;
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}
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template <class _CharT, class _Traits>
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typename basic_streambuf<_CharT, _Traits>::int_type
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basic_streambuf<_CharT, _Traits>::overflow(int_type)
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|
{
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|
return traits_type::eof();
|
|
}
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|
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|
#ifndef _LIBCPP_DO_NOT_ASSUME_STREAMS_EXPLICIT_INSTANTIATION_IN_DYLIB
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|
_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_streambuf<char>)
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|
_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_streambuf<wchar_t>)
|
|
|
|
_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ios<char>)
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|
_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ios<wchar_t>)
|
|
#endif
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
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|
|
|
_LIBCPP_POP_MACROS
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|
|
|
#endif // _LIBCPP_STEAMBUF
|