ostream.h

早期freebsd实现

// This may look like C code, but it is really -*- C++ -*-
/* 
Copyright (C) 1989, 1992 Free Software Foundation
    written by Doug Lea ([e-mail])

This file is part of the GNU C++ Library.  This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.  This library is distributed in the hope
that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.  See the GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* *** Version 1.2 -- nearly 100% AT&T 1.2 compatible *** */

/* ostream.h now  separately includable */

#ifndef _ostream_h
#ifdef __GNUG__
#pragma interface
#endif
#define _ostream_h 1

/* uncomment the next line to disable    ostream << char */
//#define NO_OUTPUT_CHAR


#include <File.h>
#include <streambuf.h>
#include <filebuf.h>
#include <Filebuf.h>

class istream;

class ostream
{
  friend class istream;
protected:
  streambuf*    bp;
  state_value   state;           // _good/_eof/_fail/_bad
  char          ownbuf;          // true if we own *bp
  
public:
                ostream(const char* filename, io_mode m, access_mode a);
                ostream(const char* filename, const char* m);
                ostream(int filedesc, io_mode m);
                ostream(FILE* fileptr);
                ostream(int sz, char* buf);
                ostream(int filedesc, char* buf, int buflen);
                ostream(int filedesc);
                ostream(streambuf* s);

               ~ostream();

  ostream&      open(const char* filename, io_mode m, access_mode a);
  ostream&      open(const char* filename, const char* m);
  ostream&      open(int  filedesc, io_mode m);
  ostream&      open(FILE* fileptr);
  ostream&      open(const char* filenam, open_mode m);

  ostream&      close();
  ostream&      flush();

// stream status

  int           rdstate();
  int           eof();
  int           fail();
  int           bad();
  int           good();

// other status queries

  int           readable();
  int           writable();
  int           is_open();

                operator void*();
  int           operator !();

  const char*   name();

  char*         bufptr();

// error handling

  void          error();
  void          clear(state_value f = _good); // poorly named
  void          set(state_value f); // set corresponding bit
  void          unset(state_value); // clear corresponding bit
  ostream&      failif(int cond);

// unformatted IO

  ostream&      put(char  c);
  ostream&      put(const char* s);
  ostream&      put(const char* s, int slen);
           
// formatted IO

  ostream&      form(const char* fmt, ...);           

  ostream&      operator << (short  n);
  ostream&      operator << (unsigned short n);
  ostream&      operator << (int    n);
  ostream&      operator << (unsigned int n);
  ostream&      operator << (long   n);
  ostream&      operator << (unsigned long n);
#ifdef __GNUG__
  ostream&      operator << (long long n);
  ostream&      operator << (unsigned long long n);
#endif /* __GNUG__ */
  ostream&      operator << (float  n);
  ostream&      operator << (double n);
  ostream&      operator << (const char* s);
  ostream&      operator << (const void* ptr);

#ifndef NO_OUTPUT_CHAR
  ostream&      operator << (char   c);
#endif

};

extern ostream  cout;            // stdout
extern ostream  cerr;            // stderr

#if defined(__OPTIMIZE__) || defined(USE_LIBGXX_INLINES)


inline void ostream::clear(state_value flag)
{
  state = flag;
}

inline void ostream::set(state_value flag)
{
  state = state_value(int(state) | int(flag));
}

inline void ostream::unset(state_value flag)
{
  state = state_value(int(state) & ~int(flag));
}

inline int ostream::rdstate()
{
  return int(state);
}

inline int ostream::good()
{
  return state == _good;
}

inline int ostream::eof()
{
  return int(state) & int(_eof);
}

inline int ostream::fail()
{
  return int(state) & int(_fail);
}

inline int ostream::bad()
{
  return int(state) & int(_bad);
}

inline ostream::operator void*()
{
  return (state == _good)? this : 0;
}

inline int ostream::operator !()
{
  return (state != _good);
}

inline ostream& ostream::failif(int cond)
{
  if (cond) set(_fail); return *this;
}

inline int ostream::is_open()
{
  return bp->is_open();
}

inline int ostream::readable()
{
  return 0;
}

inline int ostream::writable()
{
  return (bp != 0) && (state == _good);
}


inline char* ostream::bufptr()
{
  return bp->base;
}

inline ostream& ostream::flush()
{
  bp->overflow(); return *this;
}

inline ostream& ostream::close()
{
  bp->overflow(); bp->close();  return *this;
}

inline ostream& ostream::put(char ch)
{
  return failif((state != _good) || bp->sputc((int)ch &0xff) == EOF);
}

#ifndef NO_OUTPUT_CHAR
inline ostream& ostream::operator << (char ch)
{
  return failif((state != _good) || bp->sputc((int)ch &0xff) == EOF);
}
#endif

inline ostream& ostream::put(const char* s)
{
  return failif((state != _good) || bp->sputs(s) == EOF);
}

inline ostream& ostream::put(const char* s, int len)
{
  return failif((state != _good) || bp->sputsn(s, len) == EOF);
}

inline ostream& ostream::operator << (const char* s)
{
  return failif((state != _good) || bp->sputs(s) == EOF);
}

#endif

#endif