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Driver to Hide Processes and Files. Second Edition: Splicing

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11 Mar 2011CPOL9 min read 69.5K   8.8K   115  
This article describes a driver that hides processes and files using the method of splicing.
 
/*
 * 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__)
# include <unix.h>	// get the definition of fileno
#endif

_STLP_BEGIN_NAMESPACE

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

#if defined ( _MSC_VER ) || 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(__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; }

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--); }
inline void _FILE_I_bump(FILE *__f, int __n)
{ __f->_p += __n; __f->_bf._size+=__n; __f->_r -= __n; }

inline void _FILE_I_set(FILE *__f, char* __begin, char* __next, char*
			__end) {
  __f->_bf._base = (unsigned char*) __begin;
  __f->_p = (unsigned char*) __next;
  __f->_r = __f->_bf._size = __end - __next;
}
inline char* _FILE_O_begin(const FILE *__f) { return (char*)
						__f->_bf._base; }
inline char* _FILE_O_next(const FILE *__f) { return (char*) __f->_p; } 
inline char* _FILE_O_end(const FILE *__f)
{ return (char*) __f->_p + __f->_w; }

inline ptrdiff_t _FILE_O_avail(const FILE *__f) { return __f->_w; }

inline char& _FILE_O_preincr(FILE *__f)
{ --__f->_w; --__f->_bf._size; return *(char*) (++__f->_p); }
inline char& _FILE_O_postincr(FILE *__f)
{ --__f->_w; --__f->_bf._size; return *(char*) (__f->_p++); }
inline char& _FILE_O_predecr(FILE *__f)
{ ++__f->_w; ++__f->_bf._size; return *(char*) (--__f->_p); }
inline char& _FILE_O_postdecr(FILE *__f)
{ ++__f->_w; ++__f->_bf._size; return *(char*) (__f->_p--); }
inline void _FILE_O_bump(FILE *__f, int __n)
{ __f->_p += __n; __f->_bf._size+=__n; __f->_w -= __n; }

inline void _FILE_O_set(FILE *__f, char* __begin, char* __next, char*
			__end) {
  __f->_bf._base = (unsigned char*) __begin;
  __f->_p = (unsigned char*) __next;
  __f->_w = __f->_bf._size = __end - __next;
}

# undef _STLP_FILE_I_O_IDENTICAL

#elif defined(_STLP_USE_GLIBC)

inline int   _FILE_fd(const FILE *__f) { return __f->_fileno; }
inline char* _FILE_I_begin(const FILE *__f) { return __f->_IO_read_base; }
inline char* _FILE_I_next(const FILE *__f)  { return __f->_IO_read_ptr; }
inline char* _FILE_I_end(const FILE *__f)   { return __f->_IO_read_end; }

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

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

inline void _FILE_I_set(FILE *__f, char* __begin, char* __next, char* __end) {
  __f->_IO_read_base = __begin; 
  __f->_IO_read_ptr  = __next; 
  __f->_IO_read_end  = __end; 
}

inline char* _FILE_O_begin(const FILE *__f) { return __f->_IO_write_base; }
inline char* _FILE_O_next(const FILE *__f)  { return __f->_IO_write_ptr; }
inline char* _FILE_O_end(const FILE *__f)   { return __f->_IO_write_end; }

inline ptrdiff_t _FILE_O_avail(const FILE *__f) 
  { return __f->_IO_write_end - __f->_IO_write_ptr; }

inline char& _FILE_O_preincr(FILE *__f)  { return *++__f->_IO_write_ptr; }
inline char& _FILE_O_postincr(FILE *__f) { return *__f->_IO_write_ptr++; }
inline char& _FILE_O_predecr(FILE *__f)  { return *--__f->_IO_write_ptr; }
inline char& _FILE_O_postdecr(FILE *__f) { return *__f->_IO_write_ptr--; }
inline void  _FILE_O_bump(FILE *__f, int __n) { __f->_IO_write_ptr += __n; }

inline void _FILE_O_set(FILE *__f, char* __begin, char* __next, char* __end) {
  __f->_IO_write_base = __begin; 
  __f->_IO_write_ptr  = __next; 
  __f->_IO_write_end  = __end; 

}

#elif defined(__hpux) /* && defined(__hppa) && defined(__HP_aCC)) */

#ifndef _INCLUDE_HPUX_SOURCE
extern "C" unsigned char *__bufendtab[];
#  undef  _bufend
#  define _bufend(__p) \
     (*(((__p)->__flag & _IOEXT)  ? &(((_FILEX *)(__p))->__bufendp)      \
 				    : &(__bufendtab[(__p) - __iob])))
 
#  define _bufsiz(__p)  (_bufend(__p) - (__p)->__base)
#endif /* _INCLUDE_HPUX_SOURCE */

#if defined(_STLP_HPACC_BROKEN_BUFEND)
#  undef  _bufend
#  define _bufend(__p) \
     (*(((__p)->__flag & _IOEXT)  ? &((__REINTERPRET_CAST(_FILEX*,(__p)))->__bufendp)  \
                               : &(__bufendtab[__REINTERPRET_CAST(FILE*,(__p)) - __iob])))
#endif

inline int   _FILE_fd(const FILE *__f) { return fileno(__CONST_CAST(FILE *,__f)); }
inline char* _FILE_I_begin(const FILE *__f) { return (__REINTERPRET_CAST(char*, __f->__base)); }
inline char* _FILE_I_next(const FILE *__f)  { return (__REINTERPRET_CAST(char*, __f->__ptr)); }
inline char* _FILE_I_end(const FILE *__f)   { return (__REINTERPRET_CAST(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 *__REINTERPRET_CAST(char*, ++__f->__ptr); }
inline char& _FILE_I_postincr(FILE *__f) { --__f->__cnt; return *__REINTERPRET_CAST(char*, __f->__ptr++); }
inline char& _FILE_I_predecr(FILE *__f)  { ++__f->__cnt; return *__REINTERPRET_CAST(char*,--__f->__ptr); }
inline char& _FILE_I_postdecr(FILE *__f) { ++__f->__cnt; return *__REINTERPRET_CAST(char*,__f->__ptr--); }
inline void  _FILE_I_bump(FILE *__f, int __n) { __f->__cnt -= __n; __f->__ptr += __n; }
 
inline void _FILE_I_set(FILE *__f, char* __begin, char* __next, char* __end) {
# if defined(__hpux)
   if( (unsigned long) (__f - &__iob[0]) > _NFILE)
        __f->__flag |= _IOEXT;  // used by stdio's _bufend macro and goodness knows what else...
# endif
  __f->__cnt  = __end - __next; 
  __f->__base = __REINTERPRET_CAST(unsigned char*, __begin); 
  __f->__ptr  = __REINTERPRET_CAST(unsigned char*, __next);
  _bufend(__f) = __REINTERPRET_CAST(unsigned char*, __end); 
}

// For HPUX stdio, input and output FILE manipulation is identical.

# define _STLP_FILE_I_O_IDENTICAL

#elif defined (__BORLANDC__)

typedef unsigned char* _File_ptr_type;

inline int _FILE_fd(const FILE *__f) { return __f->fd; }
inline char* _FILE_I_begin(const FILE *__f) { return (char*) __f->buffer;
}
inline char* _FILE_I_next(const FILE *__f) 
{ return (char*)__f->curp; } 
inline char* _FILE_I_end(const FILE *__f)
{ return (char*) __f->curp + __f->level; }

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

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

inline void _FILE_I_set(FILE *__f, char* __begin, char* __next, char*
			__end) {
  __f->buffer = (_File_ptr_type) __begin;
  __f->curp = (_File_ptr_type) __next;
  __f->level = __end - __next;
}

# define _STLP_FILE_I_O_IDENTICAL

#elif defined( __MWERKS__ )

// using MWERKS-specific defines here to detect other OS targets
// dwa: I'm not sure they provide fileno for all OS's, but this should
// work for Win32 and WinCE
# if __dest_os == __mac_os
inline int   _FILE_fd(const FILE *__f) { return ::fileno(__CONST_CAST(FILE*, __f)); }
# else
inline int   _FILE_fd(const FILE *__f) { return ::_fileno(__CONST_CAST(FILE*, __f)); }
# endif

//       Returns a pointer to the beginning of the buffer.
inline char* _FILE_I_begin(const FILE *__f) { return __REINTERPRET_CAST(char*, __f->buffer); }
//       Returns the current read/write position within the buffer.
inline char* _FILE_I_next(const FILE *__f) { return __REINTERPRET_CAST(char*, __f->buffer_ptr); }

//       Returns a pointer immediately past the end of the buffer.
inline char* _FILE_I_end(const FILE *__f) { return __REINTERPRET_CAST(char*, __f->buffer_ptr + __f->buffer_len); }

//       Returns the number of characters remaining in the buffer, i.e.
//       _FILE_[IO]_end(__f) - _FILE_[IO]_next(__f).
inline ptrdiff_t _FILE_I_avail(const FILE *__f) { return __f->buffer_len; }

//       Increments the current read/write position by 1, returning the 
//       character at the old position.
inline char& _FILE_I_preincr(FILE *__f)
  { --__f->buffer_len; return *(char*) (++__f->buffer_ptr); }
inline char& _FILE_I_postincr(FILE *__f)
  { --__f->buffer_len; return *(char*) (__f->buffer_ptr++); }
inline char& _FILE_I_predecr(FILE *__f)
  { ++__f->buffer_len; return *(char*) (--__f->buffer_ptr); }
inline char& _FILE_I_postdecr(FILE *__f)
  { ++__f->buffer_len; return *(char*) (__f->buffer_ptr--); }
inline void  _FILE_I_bump(FILE *__f, int __n)
  { __f->buffer_ptr += __n; __f->buffer_len -= __n; }

inline void _FILE_I_set(FILE *__f, char* __begin, char* __next, char* __end) {
  __f->buffer = __REINTERPRET_CAST(unsigned char*, __begin);
  __f->buffer_ptr   = __REINTERPRET_CAST(unsigned char*, __next);
  __f->buffer_len  = __end - __next;
  __f->buffer_size = __end - __begin;
}

# define _STLP_FILE_I_O_IDENTICAL

#elif defined(__DMC__)

inline int   _FILE_fd(const FILE *__f) { return __f->_file; }

//       Returns a pointer to the beginning of the buffer.
inline char* _FILE_I_begin(const FILE *__f) { return __f->_base; }

//       Returns the current read/write position within the buffer.
inline char* _FILE_I_next(const FILE *__f) { return __f->_ptr; }

//       Returns a pointer immediately past the end of the buffer.
inline char* _FILE_I_end(const FILE *__f) { return __f->_ptr + __f->_cnt; }

//       Returns the number of characters remaining in the buffer, i.e.
//       _FILE_[IO]_end(__f) - _FILE_[IO]_next(__f).
inline ptrdiff_t _FILE_I_avail(const FILE *__f) { return __f->_cnt; }

//       Increments the current read/write position by 1, returning the 
//       character at the NEW position.
inline char& _FILE_I_preincr(FILE *__f) { --__f->_cnt; return *(++__f->_ptr); }


//       Increments the current read/write position by 1, returning the 
//       character at the old position.
inline char& _FILE_I_postincr(FILE *__f) { --__f->_cnt; return *(__f->_ptr++); }

//       Decrements the current read/write position by 1, returning the 
//       character at the NEW position.
inline char& _FILE_I_predecr(FILE *__f) { ++__f->_cnt; return *(--__f->_ptr); }

//       Decrements the current read/write position by 1, returning the 
//       character at the old position.
inline char& _FILE_I_postdecr(FILE *__f) { ++__f->_cnt; return *(__f->_ptr--); }

//       Increments the current read/write position by __n.
inline void _FILE_I_bump(FILE *__f, int __n) { __f->_cnt -= __n; __f->_ptr += __n; }

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

# define _STLP_FILE_I_O_IDENTICAL

#elif defined(__MRC__) || defined(__SC__)		//*TY 02/24/2000 - added support for MPW

inline int   _FILE_fd(const FILE *__f) { return __f->_file; }

//       Returns a pointer to the beginning of the buffer.
inline char* _FILE_I_begin(const FILE *__f) { return (char*) __f->_base; }

//       Returns the current read/write position within the buffer.
inline char* _FILE_I_next(const FILE *__f) { return (char*) __f->_ptr; }

//       Returns a pointer immediately past the end of the buffer.
inline char* _FILE_I_end(const FILE *__f) { return (char*)__f->_end; }

//       Returns the number of characters remaining in the buffer, i.e.
//       _FILE_[IO]_end(__f) - _FILE_[IO]_next(__f).
inline ptrdiff_t _FILE_I_avail(const FILE *__f) { return __f->_cnt; }

//       Increments the current read/write position by 1, returning the 
//       character at the NEW position.
inline char& _FILE_I_preincr(FILE *__f) { --__f->_cnt; return*(char*) (++__f->_ptr); }


//       Increments the current read/write position by 1, returning the 
//       character at the old position.
inline char& _FILE_I_postincr(FILE *__f) { --__f->_cnt; return*(char*) (__f->_ptr++); }

//       Decrements the current read/write position by 1, returning the 
//       character at the NEW position.
inline char& _FILE_I_predecr(FILE *__f) { ++__f->_cnt; return*(char*) (--__f->_ptr); }

//       Decrements the current read/write position by 1, returning the 
//       character at the old position.
inline char& _FILE_I_postdecr(FILE *__f) { ++__f->_cnt; return*(char*) (__f->_ptr--); }

//       Increments the current read/write position by __n.
inline void _FILE_I_bump(FILE *__f, int __n) { __f->_cnt -= __n; __f->_ptr += __n; }

//       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.
inline void _FILE_I_set(FILE *__f, char* __begin, char* __next, char* __end)
{
	__f->_base = (unsigned char*)__begin;
	__f->_ptr  = (unsigned char*)__next;
	__f->_end  = (unsigned char*)__end;
	__f->_cnt  = __end - __next;
	__f->_size = __end - __begin;
}

# define _STLP_FILE_I_O_IDENTICAL

#elif defined (__MVS__)

typedef unsigned char* _File_ptr_type;

inline int _FILE_fd(const FILE *__f) { return fileno(__CONST_CAST(FILE
								  *,__f)); }
inline char* _FILE_I_begin(const FILE *__f) { return (char*)
						__f->__fp->__bufPtr; }
inline char* _FILE_I_next(const FILE *__f) { return (char*)
					       __f->__fp->__bufPtr; }
inline char* _FILE_I_end(const FILE *__f)
{ return (char*) __f->__fp->__bufPtr + __f->__fp->__countIn; }

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

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

inline void _FILE_I_set(FILE *__f, char* __begin, char* __next, char*
			__end) {
  // __f->_base = (_File_ptr_type) __begin;
  if(__f->__fp) {
    __f->__fp->__bufPtr = (_File_ptr_type) __next;
    __f->__fp->__countIn = __end - __next;
  }
}

inline char* _FILE_O_begin(const FILE *__f) { return (char*)__f->__fp->__bufPtr;}
inline char* _FILE_O_next(const FILE *__f) { return (char*) __f->__fp->__bufPtr;}
inline char* _FILE_O_end(const FILE *__f) { return (char*) __f->__fp->__bufPtr + __f->__fp->__countOut; }
inline ptrdiff_t _FILE_O_avail(const FILE *__f) { return __f->__fp->__countOut; }

inline char& _FILE_O_preincr(FILE *__f)
{ --__f->__fp->__countOut; return *(char*) (++__f->__fp->__bufPtr); }
inline char& _FILE_O_postincr(FILE *__f)
{ --__f->__fp->__countOut; return *(char*) (__f->__fp->__bufPtr++); }
inline char& _FILE_O_predecr(FILE *__f)
{ ++__f->__fp->__countOut; return *(char*) (--__f->__fp->__bufPtr); }
inline char& _FILE_O_postdecr(FILE *__f)
{ ++__f->__fp->__countOut; return *(char*) (__f->__fp->__bufPtr--); }
inline void _FILE_O_bump(FILE *__f, int __n)
{ __f->__fp->__bufPtr += __n; __f->__fp->__countOut -= __n; }

inline void _FILE_O_set(FILE *__f, char* __begin, char* __next, char*
			__end) {
  // __f->_base = (_File_ptr_type) __begin;
  if(__f->__fp) {
    __f->__fp->__bufPtr = (_File_ptr_type) __next;
    __f->__fp->__countOut = __end - __next;
  }
}

#elif defined(__QNXNTO__)

inline int _FILE_fd(const FILE *__f) { return __f->_handle;
}
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 = (unsigned char*) __begin;
  __f->_ptr = (unsigned char*) __next;
  __f->_cnt = __end - __next;
}

# define _STLP_FILE_I_O_IDENTICAL
 
#elif defined(__WATCOMC__)                   // Nikolaev
 
inline int       _FILE_fd      (const FILE *__f) { return __f->_handle;}
inline char*     _FILE_I_begin (const FILE *__f) { return __REINTERPRET_CAST(char*, __f->_link); }
inline char*     _FILE_I_next  (const FILE *__f) { return __REINTERPRET_CAST(char*, __f->_ptr); }
inline char*     _FILE_I_end   (const FILE *__f) { return __REINTERPRET_CAST(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 *__REINTERPRET_CAST(char*, ++__f->_ptr);
}
 
inline char& _FILE_I_postincr(FILE *__f)
{
  --__f->_cnt;
  return *__REINTERPRET_CAST(char*, __f->_ptr++);
}

inline char& _FILE_I_predecr(FILE *__f)
{
  ++__f->_cnt;
  return *__REINTERPRET_CAST(char*, --__f->_ptr);
}
 
inline char& _FILE_I_postdecr(FILE *__f)
{
  ++__f->_cnt;
  return *__REINTERPRET_CAST(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->_link = __REINTERPRET_CAST(__stream_link*, __begin);
  __f->_ptr  = __REINTERPRET_CAST(unsigned char*, __next);
  __f->_cnt  = __end - __next;
}
 
# define _STLP_FILE_I_O_IDENTICAL

#elif defined (__Lynx__)

// the prototypes are taken from LynxOS patch for STLport 4.0
inline int   _FILE_fd(const FILE *__f) { return __f->_fd; }
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 = __begin;
  __f->_ptr  = __next;
  __f->_cnt  = __end - __next;
}
# define _STLP_FILE_I_O_IDENTICAL

#else  /* A C library that we don't have an implementation for. */

# error The C++ I/O library is not configured for this compiler

#endif


// For most stdio's , input and output FILE manipulation is identical.
# ifdef _STLP_FILE_I_O_IDENTICAL
inline char* _FILE_O_begin(const FILE *__f) { return _FILE_I_begin(__f); }
inline char* _FILE_O_next(const FILE *__f)  { return _FILE_I_next(__f); }
inline char* _FILE_O_end(const FILE *__f)   { return _FILE_I_end(__f); }

inline ptrdiff_t _FILE_O_avail(const FILE *__f) { return _FILE_I_avail(__f); }

inline char& _FILE_O_preincr(FILE *__f)  { return _FILE_I_preincr(__f); }
inline char& _FILE_O_postincr(FILE *__f) { return _FILE_I_postincr(__f); }
inline char& _FILE_O_predecr(FILE *__f)  { return _FILE_I_predecr(__f); }
inline char& _FILE_O_postdecr(FILE *__f) { return _FILE_I_postdecr(__f); }

inline void  _FILE_O_bump(FILE *__f, int __n) { _FILE_I_bump(__f, __n); }
inline void _FILE_O_set(FILE *__f, char* __begin, char* __next, char* __end)
  { _FILE_I_set(__f, __begin, __next, __end); }
# endif

#else
inline int _FILE_fd(const FILE *__f) { return (int)::_fileno(__CONST_CAST(FILE *, __f)); }
#endif /* _STLP_WINCE */

_STLP_END_NAMESPACE

#endif /* _STLP_STDIO_FILE_H */

// Local Variables:
// mode:C++
// End:

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Written By
Apriorit Inc
Chief Technology Officer Apriorit Inc.
United States United States
ApriorIT is a software research and development company specializing in cybersecurity and data management technology engineering. We work for a broad range of clients from Fortune 500 technology leaders to small innovative startups building unique solutions.

As Apriorit offers integrated research&development services for the software projects in such areas as endpoint security, network security, data security, embedded Systems, and virtualization, we have strong kernel and driver development skills, huge system programming expertise, and are reals fans of research projects.

Our specialty is reverse engineering, we apply it for security testing and security-related projects.

A separate department of Apriorit works on large-scale business SaaS solutions, handling tasks from business analysis, data architecture design, and web development to performance optimization and DevOps.

Official site: https://www.apriorit.com
Clutch profile: https://clutch.co/profile/apriorit
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Written By
Sergii Bratus
Technical Lead Apriorit Inc.
Ukraine Ukraine
This member has not yet provided a Biography. Assume it's interesting and varied, and probably something to do with programming.

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Posted 11 Mar 2011

Article Copyright 2011 by Apriorit Inc, Sergii Bratus
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