_stdio_file.h

使用QT为linux 下的mplayer写的一个新的gui

/*
 * Copyright (c) 1999
 * Silicon Graphics Computer Systems, Inc.
 *
 * Copyright (c) 1999
 * Boris Fomitchev
 *
 * This material is provided "as is", with absolutely no warranty expressed
 * or implied. Any use is at your own risk.
 *
 * Permission to use or copy this software for any purpose is hereby granted
 * without fee, provided the above notices are retained on all copies.
 * Permission to modify the code and to distribute modified code is granted,
 * provided the above notices are retained, and a notice that the code was
 * modified is included with the above copyright notice.
 *
 */


// WARNING: This is an internal header file, included by other C++
// standard library headers.  You should not attempt to use this header
// file directly.


#ifndef _STLP_STDIO_FILE_H
#define _STLP_STDIO_FILE_H

// This file provides a low-level interface between the internal
// representation of struct FILE, from the C stdio library, and
// the C++ I/O library.  The C++ I/O library views a FILE object as
// a collection of three pointers: the beginning of the buffer, the
// current read/write position, and the end of the buffer.

// The interface:
// - char* _FILE_[IO]_begin(const FILE *__f);
//       Returns a pointer to the beginning of the buffer.
// - char* _FILE_[IO]_next(const FILE *__f);
//       Returns the current read/write position within the buffer.
// - char* _FILE_[IO]_end(const FILE *__f);
//       Returns a pointer immediately past the end of the buffer.
// - char* _FILE_[IO]_avail(const FILE *__f);
//       Returns the number of characters remaining in the buffer, i.e.
//       _FILE_[IO]_end(__f) - _FILE_[IO]_next(__f).
// - char& _FILE_[IO]_preincr(FILE *__f)
//       Increments the current read/write position by 1, returning the
//       character at the old position.
// - char& _FILE_[IO]_postincr(FILE *__f)
//       Increments the current read/write position by 1, returning the
//       character at the old position.
// - char& _FILE_[IO]_predecr(FILE *__f)
//       Decrements the current read/write position by 1, returning the
//       character at the old position.
// - char& _FILE_[IO]_postdecr(FILE *__f)
//       Decrements the current read/write position by 1, returning the
//       character at the old position.
// - void _FILE_[IO]_bump(FILE *__f, int __n)
//       Increments the current read/write position by __n.
// - void _FILE_[IO]_set(FILE *__f, char* __begin, char* __next, char* __end);
//       Sets the beginning of the bufer to __begin, the current read/write
//       position to __next, and the buffer's past-the-end pointer to __end.
//       If any of those pointers is null, then all of them must be null.

// Each function comes in two versions, one for a FILE used as an input
// buffer and one for a FILE used as an output buffer.  In some stdio
// implementations the two functions are identical, but in others they are
// not.

#ifndef _STLP_CSTDIO
# include <cstdio>
#endif
#ifndef _STLP_CSTDDEF
# include <cstddef>
#endif

#if defined(__MSL__) && !defined(N_PLAT_NLM)
# include <unix.h>  // get the definition of fileno
#endif

_STLP_BEGIN_NAMESPACE

//----------------------------------------------------------------------
// Implementation for eMbedded Visual C++ 3.0 and 4.2 (.NET)
#if defined (_STLP_WCE)

inline int _FILE_fd(const FILE *__f)
{
    /* check if FILE is one of the three standard streams
    We do this check first, because invoking _fileno() on one of them
    causes a terminal window to be created. This also happens if you do
    any IO on them, but merely retrieving the filedescriptor shouldn't
    already do that.

    Obviously this is pretty implementation-specific because it requires
    that indeed the first three FDs are always the same, but that is not
    only common but almost guaranteed. */
    for( int __fd=0; __fd!=3; ++__fd)
    {
        if(__f == _getstdfilex(__fd))
            return __fd;
    }

    return (int)::_fileno((FILE*)__f);
}

# undef _STLP_FILE_I_O_IDENTICAL

// Implementation for the IRIX C library.
// Solaris interface looks to be identical.
#elif !defined(_STLP_USE_GLIBC) && \
    ( defined(__sgi) || \
      ( defined(__sun) && ! defined (_LP64) )  || \
      defined (__osf__) || defined(__DECCXX) || \
      (defined (_STLP_MSVC) && !defined (_STLP_WCE_EVC3)) || \
      defined (__ICL) || defined (__MINGW32__) || defined(__DJGPP) || defined (_AIX) || defined (_CRAY))

#if defined (_STLP_MSVC) || defined (__ICL) || defined (__MINGW32__) || defined(__DJGPP)
typedef  char* _File_ptr_type;
#else
typedef  unsigned char* _File_ptr_type;
#endif

inline int   _FILE_fd(const FILE *__f) { return __f->_file; }
inline char* _FILE_I_begin(const FILE *__f) { return (char*) __f->_base; }
inline char* _FILE_I_next(const FILE *__f) { return (char*) __f->_ptr; }
inline char* _FILE_I_end(const FILE *__f)
  { return (char*) __f->_ptr + __f->_cnt; }

inline ptrdiff_t _FILE_I_avail(const FILE *__f) { return __f->_cnt; }

inline char& _FILE_I_preincr(FILE *__f)
  { --__f->_cnt; return *(char*) (++__f->_ptr); }
inline char& _FILE_I_postincr(FILE *__f)
  { --__f->_cnt; return *(char*) (__f->_ptr++); }
inline char& _FILE_I_predecr(FILE *__f)
  { ++__f->_cnt; return *(char*) (--__f->_ptr); }
inline char& _FILE_I_postdecr(FILE *__f)
  { ++__f->_cnt; return *(char*) (__f->_ptr--); }
inline void  _FILE_I_bump(FILE *__f, int __n)
  { __f->_ptr += __n; __f->_cnt -= __n; }

inline void _FILE_I_set(FILE *__f, char* __begin, char* __next, char* __end) {
  __f->_base = (_File_ptr_type) __begin;
  __f->_ptr  = (_File_ptr_type) __next;
  __f->_cnt  = __end - __next;
}

# define _STLP_FILE_I_O_IDENTICAL 1

#elif defined(__EMX__)

inline int   _FILE_fd(const FILE* __f) { return __f->_handle; }
inline char* _FILE_I_begin(const FILE* __f) { return (char*) __f->_buffer; }
inline char* _FILE_I_next(const FILE* __f) { return (char*) __f->_ptr; }
inline char* _FILE_I_end(const FILE* __f) { return (char *) __f->_ptr + __f->_rcount; }
inline ptrdiff_t _FILE_I_avail(const FILE* __f) { return __f->_rcount; }
inline char& _FILE_I_preincr(FILE* __f) { --__f->_rcount; return *(char*) (++__f->_ptr); }
inline char& _FILE_I_postincr(FILE* __f) { --__f->_rcount; return *(char*) (__f->_ptr++); }
inline char& _FILE_I_predecr(FILE* __f) { ++__f->_rcount; return *(char*) (--__f->_ptr); }
inline char& _FILE_I_postdecr(FILE* __f) { ++__f->_rcount; return *(char*) (__f->_ptr--); }
inline void  _FILE_I_bump(FILE* __f, int __n) { __f->_ptr += __n; __f->_rcount -= __n; }
inline void _FILE_I_set(FILE* __f, char* __begin, char* __next, char* __end) {
  __f->_buffer = __begin;
  __f->_ptr  = __next;
  __f->_rcount  = __end - __next;
}

inline char* _FILE_O_begin(const FILE* __f) { return (char*) __f->_buffer; }
inline char* _FILE_O_next(const FILE* __f) { return (char*) __f->_ptr; }
inline char* _FILE_O_end(const FILE* __f) { return (char*) __f->_ptr + __f->_wcount; }
inline ptrdiff_t _FILE_O_avail(const FILE* __f) { return __f->_wcount; }
inline char& _FILE_O_preincr(FILE* __f) { --__f->_wcount; return *(char*) (++__f->_ptr); }
inline char& _FILE_O_postincr(FILE* __f) { --__f->_wcount; return *(char*) (__f->_ptr++); }
inline char& _FILE_O_predecr(FILE* __f) { ++__f->_wcount; return *(char*) (--__f->_ptr); }
inline char& _FILE_O_postdecr(FILE* __f) { ++__f->_wcount; return *(char*) (__f->_ptr--); }
inline void _FILE_O_bump(FILE* __f, int __n) { __f->_ptr += __n; __f->_wcount -= __n; }
inline void _FILE_O_set(FILE* __f, char* __begin, char* __next, char* __end) {
  __f->_buffer = __begin;
  __f->_ptr  = __next;
  __f->_wcount  = __end - __next;
}


# undef _STLP_FILE_I_O_IDENTICAL

# elif defined(_STLP_SCO_OPENSERVER) || defined(__NCR_SVR)

typedef  unsigned char* _File_ptr_type;

inline int   _FILE_fd(const FILE *__f) { return __f->__file; }
inline char* _FILE_I_begin(const FILE *__f) { return (char*) __f->__base; }
inline char* _FILE_I_next(const FILE *__f) { return (char*) __f->__ptr; }
inline char* _FILE_I_end(const FILE *__f)
  { return (char*) __f->__ptr + __f->__cnt; }

inline ptrdiff_t _FILE_I_avail(const FILE *__f) { return __f->__cnt; }

inline char& _FILE_I_preincr(FILE *__f)
  { --__f->__cnt; return *(char*) (++__f->__ptr); }
inline char& _FILE_I_postincr(FILE *__f)
  { --__f->__cnt; return *(char*) (__f->__ptr++); }
inline char& _FILE_I_predecr(FILE *__f)
  { ++__f->__cnt; return *(char*) (--__f->__ptr); }
inline char& _FILE_I_postdecr(FILE *__f)
  { ++__f->__cnt; return *(char*) (__f->__ptr--); }
inline void  _FILE_I_bump(FILE *__f, int __n)
  { __f->__ptr += __n; __f->__cnt -= __n; }

inline void _FILE_I_set(FILE *__f, char* __begin, char* __next, char* __end) {
  __f->__base = (_File_ptr_type) __begin;
  __f->__ptr  = (_File_ptr_type) __next;
  __f->__cnt  = __end - __next;
}

# define _STLP_FILE_I_O_IDENTICAL 1

# elif defined(__sun) && defined( _LP64)

typedef long _File_ptr_type;

inline int _FILE_fd(const FILE *__f) { return (int) __f->__pad[2]; }
inline char* _FILE_I_begin(const FILE *__f) { return (char*)
__f->__pad[1]; }
inline char* _FILE_I_next(const FILE *__f) { return (char*)
__f->__pad[0]; }
inline char* _FILE_I_end(const FILE *__f)
{ return (char*) __f->__pad[0] + __f->__pad[3]; }

inline ptrdiff_t _FILE_I_avail(const FILE *__f) { return __f->__pad[3]; }

inline char& _FILE_I_preincr(FILE *__f)
{ --__f->__pad[3]; return *(char*) (++__f->__pad[0]); }
inline char& _FILE_I_postincr(FILE *__f)
{ --__f->__pad[3]; return *(char*) (__f->__pad[0]++); }
inline char& _FILE_I_predecr(FILE *__f)
{ ++__f->__pad[3]; return *(char*) (--__f->__pad[0]); }
inline char& _FILE_I_postdecr(FILE *__f)
{ ++__f->__pad[3]; return *(char*) (__f->__pad[0]--); }
inline void _FILE_I_bump(FILE *__f, long __n)
{ __f->__pad[0] += __n; __f->__pad[3] -= __n; }

inline void _FILE_I_set(FILE *__f, char* __begin, char* __next, char*
__end) {
__f->__pad[1] = (_File_ptr_type) __begin;
__f->__pad[0] = (_File_ptr_type) __next;
__f->__pad[3] = __end - __next;
}

# define _STLP_FILE_I_O_IDENTICAL

#elif defined (__CYGWIN__) || defined(__FreeBSD__)  || defined(__NetBSD__) || defined(__OpenBSD__) \
  || defined(__amigaos__) || ( defined(__GNUC__) && defined(__APPLE__) )

inline int _FILE_fd(const FILE *__f) { return __f->_file; }
inline char* _FILE_I_begin(const FILE *__f) { return (char*)   __f->_bf._base; }
inline char* _FILE_I_next(const FILE *__f) { return (char*) __f->_p; }
inline char* _FILE_I_end(const FILE *__f)
{ return (char*) __f->_p + __f->_r; }

inline ptrdiff_t _FILE_I_avail(const FILE *__f) { return __f->_r; }

#if ( defined(__GNUC__) && defined(__APPLE__) )
inline char& _FILE_I_preincr(FILE *__f)
{ --__f->_r; return *(char*) (++__f->_p); }
inline char& _FILE_I_postincr(FILE *__f)
{ --__f->_r; return *(char*) (__f->_p++); }
inline char& _FILE_I_predecr(FILE *__f)
{ ++__f->_r; return *(char*) (--__f->_p); }
inline char& _FILE_I_postdecr(FILE *__f)
{ ++__f->_r; return *(char*) (__f->_p--); }
inline void _FILE_I_bump(FILE *__f, int __n)
{ __f->_p += __n; __f->_r -= __n; }
#else
inline char& _FILE_I_preincr(FILE *__f)
{ --__f->_r; --__f->_bf._size; return *(char*) (++__f->_p); }
inline char& _FILE_I_postincr(FILE *__f)
{ --__f->_r; --__f->_bf._size; return *(char*) (__f->_p++); }
inline char& _FILE_I_predecr(FILE *__f)
{ ++__f->_r; ++ __f->_bf._size; return *(char*) (--__f->_p); }
inline char& _FILE_I_postdecr(FILE *__f)
{ ++__f->_r; ++__f->_bf._size; return *(char*) (__f->_p--); }