Parma_Polyhedra_Library::stdiobuf Class Reference

#include <stdiobuf_defs.hh>

Inheritance diagram for Parma_Polyhedra_Library::stdiobuf:

Collaboration diagram for Parma_Polyhedra_Library::stdiobuf:

Public Member Functions
	stdiobuf (FILE *file)
	Constructor. More...

Protected Member Functions
virtual int_type	underflow ()
	Gets a character in case of underflow. More...
virtual int_type	uflow ()
	In case of underflow, gets a character and advances the next pointer. More...
virtual std::streamsize	xsgetn (char_type *s, std::streamsize n)
	Gets a sequence of characters. More...
virtual int_type	pbackfail (int_type c=traits_type::eof())
	Puts character back in case of backup underflow. More...
virtual std::streamsize	xsputn (const char_type *s, std::streamsize n)
	Writes a sequence of characters. More...
virtual int_type	overflow (int_type c)
	Writes a character in case of overflow. More...
virtual int	sync ()
	Synchronizes the stream buffer. More...

Private Types
typedef char	char_type
	Character type of the streambuf. More...
typedef std::char_traits< char_type >	traits_type
	Traits type of the streambuf. More...
typedef traits_type::int_type	int_type
	Integer type of the streambuf. More...

Private Attributes
FILE *	fp
	The encapsulated stdio file. More...
int_type	unget_char_buf
	Buffer for the last character read. More...

Detailed Description

Definition at line 31 of file stdiobuf_defs.hh.

Member Typedef Documentation

typedef char Parma_Polyhedra_Library::stdiobuf::char_type

private

Character type of the streambuf.

Definition at line 94 of file stdiobuf_defs.hh.

typedef traits_type::int_type Parma_Polyhedra_Library::stdiobuf::int_type

private

Integer type of the streambuf.

Definition at line 100 of file stdiobuf_defs.hh.

typedef std::char_traits<char_type> Parma_Polyhedra_Library::stdiobuf::traits_type

private

Traits type of the streambuf.

Definition at line 97 of file stdiobuf_defs.hh.

Constructor & Destructor Documentation

Parma_Polyhedra_Library::stdiobuf::stdiobuf ( FILE *  file )

inline

Constructor.

Definition at line 30 of file stdiobuf_inlines.hh.

  : fp(file), unget_char_buf(traits_type::eof()) {
}

Member Function Documentation

stdiobuf::int_type Parma_Polyhedra_Library::stdiobuf::overflow ( int_type  c )

protectedvirtual

Writes a character in case of overflow.

Specified by ISO/IEC 14882:1998: 27.5.2.4.5.

Definition at line 73 of file stdiobuf.cc.

References fp.

                             {
  const int_type eof = traits_type::eof();
  if (traits_type::eq_int_type(c, eof)) {
    return (fflush(fp) != 0) ? eof : traits_type::not_eof(c);
  }
  else {
    return putc(c, fp);
  }
}

stdiobuf::int_type Parma_Polyhedra_Library::stdiobuf::pbackfail ( int_type  c = traits_type::eof() )

protectedvirtual

Puts character back in case of backup underflow.

Remarks

Specified by ISO/IEC 14882:1998: 27.5.2.4.4.

Definition at line 58 of file stdiobuf.cc.

References c, fp, and unget_char_buf.

                              {
  const int_type eof = traits_type::eof();
  const int_type u = traits_type::eq_int_type(c, eof) ? unget_char_buf : c;
  unget_char_buf = eof;
  return traits_type::eq_int_type(u, eof) ? eof : ungetc(u, fp);
}

int Parma_Polyhedra_Library::stdiobuf::sync ( )

protectedvirtual

Synchronizes the stream buffer.

Specified by ISO/IEC 14882:1998: 27.5.2.4.2.

Definition at line 84 of file stdiobuf.cc.

References fp.

               {
  return fflush(fp);
}

stdiobuf::int_type Parma_Polyhedra_Library::stdiobuf::uflow ( )

protectedvirtual

In case of underflow, gets a character and advances the next pointer.

Remarks

Specified by ISO/IEC 14882:1998: 27.5.2.4.3.

Definition at line 33 of file stdiobuf.cc.

References fp, and unget_char_buf.

                {
  unget_char_buf = getc(fp);
  return unget_char_buf;
}

stdiobuf::int_type Parma_Polyhedra_Library::stdiobuf::underflow ( )

protectedvirtual

Gets a character in case of underflow.

Remarks

Specified by ISO/IEC 14882:1998: 27.5.2.4.3.

Definition at line 39 of file stdiobuf.cc.

References c, and fp.

                    {
  const int_type c = getc(fp);
  return ungetc(c, fp);
}

std::streamsize Parma_Polyhedra_Library::stdiobuf::xsgetn ( char_type *  s, std::streamsize  n  )

protectedvirtual

Gets a sequence of characters.

Remarks

Specified by ISO/IEC 14882:1998: 27.5.2.4.3.

Definition at line 45 of file stdiobuf.cc.

References fp, and unget_char_buf.

                                              {
  PPL_ASSERT(n >= 0);
  const size_t r = fread(s, 1, static_cast<size_t>(n), fp);
  if (r > 0) {
    unget_char_buf = traits_type::to_int_type(s[r - 1]);
  }
  else {
    unget_char_buf = traits_type::eof();
  }
  return static_cast<std::streamsize>(r);
}

std::streamsize Parma_Polyhedra_Library::stdiobuf::xsputn ( const char_type *  s, std::streamsize  n  )

protectedvirtual

Writes a sequence of characters.

Remarks

Specified by ISO/IEC 14882:1998: 27.5.2.4.5.

Definition at line 66 of file stdiobuf.cc.

References fp.

                                                    {
  PPL_ASSERT(n >= 0);
  const size_t r = fwrite(s, 1, static_cast<size_t>(n), fp);
  return static_cast<std::streamsize>(r);
}

Member Data Documentation

FILE* Parma_Polyhedra_Library::stdiobuf::fp

private

The encapsulated stdio file.

Definition at line 103 of file stdiobuf_defs.hh.

Referenced by overflow(), pbackfail(), sync(), uflow(), underflow(), xsgetn(), and xsputn().

int_type Parma_Polyhedra_Library::stdiobuf::unget_char_buf

private

Buffer for the last character read.

Definition at line 106 of file stdiobuf_defs.hh.

Referenced by pbackfail(), uflow(), and xsgetn().

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The documentation for this class was generated from the following files:

• stdiobuf_defs.hh
• stdiobuf.cc
• stdiobuf_inlines.hh