#include <stdio.h>

#ifdef sun
#ifdef _IOSTRG
#define sunos
#else
#define solaris
#endif
#endif

#include <ar.h>
#ifdef AIAMAG
#define aix
#endif

#ifdef _HIUX_SOURCE
#define hpux
#endif

/*
 * Select system dependent system calls about:
 *   synchronous I/O multiplexing: {HAS_SELECT, HAS_POLL}
 *   terminal control: {USE_SGTTY,  USE_TERMIO, USE_TERMIOS}
 */

#if defined(sunos) \
 || defined(pureBSD43) \
 || defined(ultrix) \
 || defined(sony_news) \
 || defined(MACH) \
 || defined(NeXT) \
 || defined(bsdi) \
 || defined(__FreeBSD__)
#define USE_SGTTY
#define HAS_SELECT
#endif

#if defined(solaris) \
 || defined(sgi) \
 || defined(nec_ews) \
 || defined(_nec_ews_svr4)
#define USE_TERMIO
#define HAS_POLL
#endif

#if defined(hpux) \
 || defined(aix) \
 || defined(__linux__) \
 || defined(__osf__) && defined(__alpha) \
 || defined(H3050R)
#define USE_TERMIOS
#define HAS_SELECT
#endif

#if defined (AUX3) || defined (macII) || (_AUX_SOURCE)
#  undef AUX3
#  define AUX3
#  define USE_TERMIO
#  define HAS_SELECT
#endif

/*
 * Get the count of bufferd characters.
 */
#ifdef __linux__
#ifdef _IO_STDIO_H
#define READYCC(fp)	(fp->_IO_read_end - fp->_IO_read_ptr)
#else
#define READYCC(fp)	(fp->_egptr - fp->_gptr)
#endif
#else
#if defined(bsdi) || defined(__FreeBSD__)
#define READYCC(fp)	(fp->_r)
#else
#define READYCC(fp)	(fp->_cnt)
#endif
#endif