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/****************************************************************************

 *                                                                          *

 *                         GNAT COMPILER COMPONENTS                         *

 *                                                                          *

 *                                S Y S D E P                               *

 *                                                                          *

 *                          C Implementation File                           *

 *                                                                          *

 *         Copyright (C) 1992-2009, Free Software Foundation, Inc.          *

 *                                                                          *

 * GNAT is free software;  you can  redistribute it  and/or modify it under *

 * terms of the  GNU General Public License as published  by the Free Soft- *

 * ware  Foundation;  either version 3,  or (at your option) any later ver- *

 * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *

 * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *

 * or FITNESS FOR A PARTICULAR PURPOSE.                                     *

 *                                                                          *

 * As a special exception under Section 7 of GPL version 3, you are granted *

 * additional permissions described in the GCC Runtime Library Exception,   *

 * version 3.1, as published by the Free Software Foundation.               *

 *                                                                          *

 * You should have received a copy of the GNU General Public License and    *

 * a copy of the GCC Runtime Library Exception along with this program;     *

 * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *

 * <http://www.gnu.org/licenses/>.                                          *

 *                                                                          *

 * GNAT was originally developed  by the GNAT team at  New York University. *

 * Extensive contributions were provided by Ada Core Technologies Inc.      *

 *                                                                          *

 ****************************************************************************/

/* This file contains system dependent symbols that are referenced in the

   GNAT Run Time Library */

#ifdef __vxworks

#include "ioLib.h"

#if ! defined (__VXWORKSMILS__)

#include "dosFsLib.h"

#endif

#if ! defined (__RTP__) && (! defined (VTHREADS) || defined (__VXWORKSMILS__))

# include "nfsLib.h"

#endif

#include "selectLib.h"

#include "vxWorks.h"

#endif

#ifdef IN_RTS

#define POSIX

#include "tconfig.h"

#include "tsystem.h"

#include <fcntl.h>

#include <sys/stat.h>

#ifdef VMS

#include <unixio.h>

#endif

#else

#include "config.h"

#include "system.h"

#endif

#include <time.h>

#include <errno.h>

#if defined (sun) && defined (__SVR4) && !defined (__vxworks)

/* The declaration is present in <time.h> but conditionalized

   on a couple of macros we don't define.  */

extern struct tm *localtime_r(const time_t *, struct tm *);

#endif

#include "adaint.h"

/*

   mode_read_text

   open text file for reading

   rt for DOS and Windows NT, r for Unix

   mode_write_text

   truncate to zero length or create text file for writing

   wt for DOS and Windows NT, w for Unix

   mode_append_text

   append; open or create text file for writing at end-of-file

   at for DOS and Windows NT, a for Unix

   mode_read_binary

   open binary file for reading

   rb for DOS and Windows NT, r for Unix

   mode_write_binary

   truncate to zero length or create binary file for writing

   wb for DOS and Windows NT, w for Unix

   mode_append_binary

   append; open or create binary file for writing at end-of-file

   ab for DOS and Windows NT, a for Unix

   mode_read_text_plus

   open text file for update (reading and writing)

   r+t for DOS and Windows NT, r+ for Unix

   mode_write_text_plus

   truncate to zero length or create text file for update

   w+t for DOS and Windows NT, w+ for Unix

   mode_append_text_plus

   append; open or create text file for update, writing at end-of-file

   a+t for DOS and Windows NT, a+ for Unix

   mode_read_binary_plus

   open binary file for update (reading and writing)

   r+b for DOS and Windows NT, r+ for Unix

   mode_write_binary_plus

   truncate to zero length or create binary file for update

   w+b for DOS and Windows NT, w+ for Unix

   mode_append_binary_plus

   append; open or create binary file for update, writing at end-of-file

   a+b for DOS and Windows NT, a+ for Unix

   Notes:

   (1) Opening a file with read mode fails if the file does not exist or

   cannot be read.

   (2) Opening a file with append mode causes all subsequent writes to the

   file to be forced to the then current end-of-file, regardless of

   intervening calls to the fseek function.

   (3) When a file is opened with update mode, both input and output may be

   performed on the associated stream.  However, output may not be directly

   followed by input without an intervening call to the fflush function or

   to a file positioning function (fseek, fsetpos, or rewind), and input

   may not be directly followed by output without an intervening call to a

   file positioning function, unless the input operation encounters

   end-of-file.

   The other target dependent declarations here are for the two functions

   __gnat_set_binary_mode and __gnat_set_text_mode:

      void __gnat_set_binary_mode (int handle);

      void __gnat_set_text_mode   (int handle);

   These functions have no effect in Unix (or similar systems where there is

   no distinction between binary and text files), but in DOS (and similar

   systems where text mode does CR/LF translation), these functions allow

   the mode of the stream with the given handle (fileno can be used to get

   the handle of a stream) to be changed dynamically. The returned result

   is 0 if no error occurs and -1 if an error occurs.

   Finally there is a boolean (character) variable

      char __gnat_text_translation_required;

   which is zero (false) in Unix mode, and one (true) in DOS mode, with a

   true value indicating that text translation is required on text files

   and that fopen supports the trailing t and b modifiers.

*/

#if defined(WINNT) || defined (MSDOS) || defined (__EMX__)

static const char *mode_read_text = "rt";

static const char *mode_write_text = "wt";

static const char *mode_append_text = "at";

static const char *mode_read_binary = "rb";

static const char *mode_write_binary = "wb";

static const char *mode_append_binary = "ab";

static const char *mode_read_text_plus = "r+t";

static const char *mode_write_text_plus = "w+t";

static const char *mode_append_text_plus = "a+t";

static const char *mode_read_binary_plus = "r+b";

static const char *mode_write_binary_plus = "w+b";

static const char *mode_append_binary_plus = "a+b";

const char __gnat_text_translation_required = 1;

void

__gnat_set_binary_mode (int handle)

{

  _setmode (handle, O_BINARY);

}

void

__gnat_set_text_mode (int handle)

{

  _setmode (handle, O_TEXT);

}

#ifdef __MINGW32__

#include <windows.h>

/* Return the name of the tty.   Under windows there is no name for

   the tty, so this function, if connected to a tty, returns the generic name

   "console".  */

char *

__gnat_ttyname (int filedes)

{

  if (isatty (filedes))

    return "console";

  else

    return NULL;

}

/* This function is needed to fix a bug under Win95/98. Under these platforms

   doing :

                ch1 = getch();

                ch2 = fgetc (stdin);

   will put the same character into ch1 and ch2. It seem that the character

   read by getch() is not correctly removed from the buffer. Even a

   fflush(stdin) does not fix the bug. This bug does not appear under Window

   NT. So we have two version of this routine below one for 95/98 and one for

   NT/2000 version of Windows. There is also a special routine (winflushinit)

   that will be called only the first time to check which version of Windows

   we are running running on to set the right routine to use.

   This problem occurs when using Text_IO.Get_Line after Text_IO.Get_Immediate

   for example.

   Calling FlushConsoleInputBuffer just after getch() fix the bug under

   95/98. */

#ifdef RTX

static void winflush_nt (void);

/* winflush_function will do nothing since we only have problems with Windows

   95/98 which are not supported by RTX. */

static void (*winflush_function) (void) = winflush_nt;

static void

winflush_nt (void)

{

  /* Does nothing as there is no problem under NT.  */

}

#else

static void winflush_init (void);

static void winflush_95 (void);

static void winflush_nt (void);

int __gnat_is_windows_xp (void);

/* winflusfunction is set first to the winflushinit function which will check

   the OS version 95/98 or NT/2000 */

static void (*winflush_function) (void) = winflush_init;

/* This function does the runtime check of the OS version and then sets

   winflush_function to the appropriate function and then call it. */

static void

winflush_init (void)

{

  DWORD dwVersion = GetVersion();

  if (dwVersion < 0x80000000)                /* Windows NT/2000 */

    winflush_function = winflush_nt;

  else                                       /* Windows 95/98   */

    winflush_function = winflush_95;

  (*winflush_function)();      /* Perform the 'flush' */

}

static void

winflush_95 (void)

{

  FlushConsoleInputBuffer (GetStdHandle (STD_INPUT_HANDLE));

}

static void

winflush_nt (void)

{

  /* Does nothing as there is no problem under NT.  */

}

int

__gnat_is_windows_xp (void)

{

  static int is_win_xp=0, is_win_xp_checked=0;

  if (!is_win_xp_checked)

    {

      OSVERSIONINFO version;

      is_win_xp_checked = 1;

      memset (&version, 0, sizeof (version));

      version.dwOSVersionInfoSize = sizeof (version);

      is_win_xp = GetVersionEx (&version)

        && version.dwPlatformId == VER_PLATFORM_WIN32_NT

        && (version.dwMajorVersion > 5

            || (version.dwMajorVersion == 5 && version.dwMinorVersion >= 1));

    }

  return is_win_xp;

}

#endif

#endif

#else

static const char *mode_read_text = "r";

static const char *mode_write_text = "w";

static const char *mode_append_text = "a";

static const char *mode_read_binary = "r";

static const char *mode_write_binary = "w";

static const char *mode_append_binary = "a";

static const char *mode_read_text_plus = "r+";

static const char *mode_write_text_plus = "w+";

static const char *mode_append_text_plus = "a+";

static const char *mode_read_binary_plus = "r+";

static const char *mode_write_binary_plus = "w+";

static const char *mode_append_binary_plus = "a+";

const char __gnat_text_translation_required = 0;

/* These functions do nothing in non-DOS systems. */

void

__gnat_set_binary_mode (int handle ATTRIBUTE_UNUSED)

{

}

void

__gnat_set_text_mode (int handle ATTRIBUTE_UNUSED)

{

}

char *

__gnat_ttyname (int filedes)

{

#if defined (__vxworks) || defined (__nucleus)

  return "";

#else

  extern char *ttyname (int);

  return ttyname (filedes);

#endif /* defined (__vxworks) || defined (__nucleus) */

}

#endif

#if defined (linux) || defined (sun) || defined (sgi) || defined (__EMX__) \

  || (defined (__osf__) && ! defined (__alpha_vxworks)) || defined (WINNT) \

  || defined (__MACHTEN__) || defined (__hpux__) || defined (_AIX) \

  || (defined (__svr4__) && defined (i386)) || defined (__Lynx__) \

  || defined (__CYGWIN__) || defined (__FreeBSD__) || defined (__OpenBSD__) \

  || defined (__GLIBC__) || defined (__APPLE__)

#ifdef __MINGW32__

#if OLD_MINGW

#include <termios.h>

#else

#include <conio.h>  /* for getch(), kbhit() */

#endif

#else

#include <termios.h>

#endif

#else

#if defined (VMS)

extern char *decc$ga_stdscr;

static int initted = 0;

#endif

#endif

/* Implements the common processing for getc_immediate and

   getc_immediate_nowait. */

extern void getc_immediate (FILE *, int *, int *);

extern void getc_immediate_nowait (FILE *, int *, int *, int *);

extern void getc_immediate_common (FILE *, int *, int *, int *, int);

/* Called by Get_Immediate (Foo); */

void

getc_immediate (FILE *stream, int *ch, int *end_of_file)

{

  int avail;

  getc_immediate_common (stream, ch, end_of_file, &avail, 1);

}

/* Called by Get_Immediate (Foo, Available); */

void

getc_immediate_nowait (FILE *stream, int *ch, int *end_of_file, int *avail)

{

  getc_immediate_common (stream, ch, end_of_file, avail, 0);

}

/* Called by getc_immediate () and getc_immediate_nowait () */

void

getc_immediate_common (FILE *stream,

                       int *ch,

                       int *end_of_file,

                       int *avail,

                       int waiting)

{

#if defined (linux) || defined (sun) || defined (sgi) || defined (__EMX__) \

    || (defined (__osf__) && ! defined (__alpha_vxworks)) \

    || defined (__CYGWIN32__) || defined (__MACHTEN__) || defined (__hpux__) \

    || defined (_AIX) || (defined (__svr4__) && defined (i386)) \

    || defined (__Lynx__) || defined (__FreeBSD__) || defined (__OpenBSD__) \

    || defined (__GLIBC__) || defined (__APPLE__)

  char c;

  int nread;

  int good_one = 0;

  int eof_ch = 4; /* Ctrl-D */

  int fd = fileno (stream);

  struct termios otermios_rec, termios_rec;

  if (isatty (fd))

    {

      tcgetattr (fd, &termios_rec);

      memcpy (&otermios_rec, &termios_rec, sizeof (struct termios));

      /* Set RAW mode, with no echo */

      termios_rec.c_lflag = termios_rec.c_lflag & ~ICANON & ~ECHO;

#if defined(linux) || defined (sun) || defined (sgi) || defined (__EMX__) \

    || defined (__osf__) || defined (__MACHTEN__) || defined (__hpux__) \

    || defined (_AIX) || (defined (__svr4__) && defined (i386)) \

    || defined (__Lynx__) || defined (__FreeBSD__) || defined (__OpenBSD__) \

    || defined (__GLIBC__) || defined (__APPLE__)

      eof_ch = termios_rec.c_cc[VEOF];

      /* If waiting (i.e. Get_Immediate (Char)), set MIN = 1 and wait for

         a character forever. This doesn't seem to effect Ctrl-Z or

         Ctrl-C processing except on OS/2 where Ctrl-C won't work right

         unless we do a read loop. Luckily we can delay a bit between

         iterations. If not waiting (i.e. Get_Immediate (Char, Available)),

         don't wait for anything but timeout immediately. */

#ifdef __EMX__

      termios_rec.c_cc[VMIN] = 0;

      termios_rec.c_cc[VTIME] = waiting;

#else

      termios_rec.c_cc[VMIN] = waiting;

      termios_rec.c_cc[VTIME] = 0;

#endif

#endif

      tcsetattr (fd, TCSANOW, &termios_rec);

      while (! good_one)

        {

          /* Read is used here instead of fread, because fread doesn't

             work on Solaris5 and Sunos4 in this situation.  Maybe because we

             are mixing calls that use file descriptors and streams. */

          nread = read (fd, &c, 1);

          if (nread > 0)

            {

              /* On Unix terminals, Ctrl-D (EOT) is an End of File. */

              if (c == eof_ch)

                {

                  *avail = 0;

                  *end_of_file = 1;

                  good_one = 1;

                }

              /* Everything else is ok */

              else if (c != eof_ch)

                {

                  *avail = 1;

                  *end_of_file = 0;

                  good_one = 1;

                }

            }

          else if (! waiting)

            {

              *avail = 0;

              *end_of_file = 0;

              good_one = 1;

            }

          else

            good_one = 0;

        }

      tcsetattr (fd, TCSANOW, &otermios_rec);

      *ch = c;

    }

  else

#elif defined (VMS)

  int fd = fileno (stream);

  if (isatty (fd))

    {

      if (initted == 0)

        {

          decc$bsd_initscr ();

          initted = 1;

        }

      decc$bsd_cbreak ();

      *ch = decc$bsd_wgetch (decc$ga_stdscr);

      if (*ch == 4)

        *end_of_file = 1;

      else

        *end_of_file = 0;

      *avail = 1;

      decc$bsd_nocbreak ();

    }

  else

#elif defined (__MINGW32__)

  int fd = fileno (stream);

  int char_waiting;

  int eot_ch = 4; /* Ctrl-D */

  if (isatty (fd))

    {

      if (waiting)

        {

          *ch = getch ();

          (*winflush_function) ();

          if (*ch == eot_ch)

            *end_of_file = 1;

          else

            *end_of_file = 0;

          *avail = 1;

        }

      else /* ! waiting */

        {

          char_waiting = kbhit();

          if (char_waiting == 1)

            {

              *avail = 1;

              *ch = getch ();

              (*winflush_function) ();

              if (*ch == eot_ch)

                *end_of_file = 1;

              else

                *end_of_file = 0;

            }

          else

            {

              *avail = 0;

              *end_of_file = 0;

            }

        }

    }

  else

#elif defined (__vxworks)

  /* Bit masks of file descriptors to read from.  */

  struct fd_set readFds;

  /* Timeout before select returns if nothing can be read.  */

  struct timeval timeOut;

  char c;

  int fd = fileno (stream);

  int nread;

  int option;

  int readable;

  int status;

  int width;

  if (isatty (fd))

    {

      /* If we do not want to wait, we have to set up fd in RAW mode. This

         should be done outside this function as setting fd in RAW mode under

         vxWorks flushes the buffer of fd. If the RAW mode was set here, the

         buffer would be empty and we would always return that no character

         is available */

      if (! waiting)

        {

          /* Initialization of timeOut for its use with select.  */

          timeOut.tv_sec  = 0;

          timeOut.tv_usec = 0;

          /* Initialization of readFds for its use with select;

             FD is the only file descriptor to be monitored */

          FD_ZERO (&readFds);

          FD_SET (fd, &readFds);

          width = 2;

          /* We do all this processing to emulate a non blocking read.  */

          readable = select (width, &readFds, NULL, NULL, &timeOut);

          if (readable == ERROR)

            *avail = -1, *end_of_file = -1;

          /* No character available in input.  */

          else if (readable == 0)

            *avail = 0, *end_of_file = 0;

          else

            {

              nread = read (fd, &c, 1);

              if (nread > 0)

                *avail = 1, *end_of_file = 0;

              /* End Of File. */

              else if (nread == 0)

                *avail = 0, *end_of_file = 1;

              /* Error.  */

              else

                *avail = -1, *end_of_file = -1;

            }

        }

      /* We have to wait until we get a character */

      else

        {

          *avail = -1;

          *end_of_file = -1;

          /* Save the current mode of FD.  */

          option = ioctl (fd, FIOGETOPTIONS, 0);

          /* Set FD in RAW mode.  */

          status = ioctl (fd, FIOSETOPTIONS, OPT_RAW);

          if (status != -1)

            {

              nread = read (fd, &c, 1);

              if (nread > 0)

                *avail = 1, *end_of_file = 0;

              /* End of file.  */

              else if (nread == 0)

                *avail = 0, *end_of_file = 1;

              /* Else there is an ERROR.  */

            }

          /* Revert FD to its previous mode. */

          status = ioctl (fd, FIOSETOPTIONS, option);

        }

      *ch = c;

    }

  else

#endif

    {

      /* If we're not on a terminal, then we don't need any fancy processing.

         Also this is the only thing that's left if we're not on one of the

         supported systems; which means that for non supported systems,

         get_immediate may wait for a carriage return on terminals. */

      *ch = fgetc (stream);

      if (feof (stream))

        {

          *end_of_file = 1;

          *avail = 0;

        }

      else

        {

          *end_of_file = 0;

          *avail = 1;

        }

    }

}

/* The following definitions are provided in NT to support Windows based

   Ada programs.  */

#ifdef WINNT

#include <windows.h>

/* Provide functions to echo the values passed to WinMain (windows bindings

   will want to import these).  We use the same names as the routines used

   by AdaMagic for compatibility.  */

char *rts_get_hInstance (void);

char *rts_get_hPrevInstance (void);

char *rts_get_lpCommandLine (void);

int   rts_get_nShowCmd (void);

char *

rts_get_hInstance (void)

{

  return (char *)GetModuleHandleA (0);

}

char *

rts_get_hPrevInstance (void)

{

  return 0;

}

char *

rts_get_lpCommandLine (void)

{

  return GetCommandLineA ();

}

int

rts_get_nShowCmd (void)

{

  return 1;

}

#endif /* WINNT */

#ifdef VMS

/* This gets around a problem with using the old threads library on VMS 7.0. */

extern long get_gmtoff (void);

long

get_gmtoff (void)

{

  time_t t;

  struct tm *ts;

  t = time ((time_t) 0);

  ts = localtime (&t);

  return ts->tm_gmtoff;

}

#endif

/* This value is returned as the time zone offset when a valid value

   cannot be determined. It is simply a bizarre value that will never

   occur. It is 3 days plus 73 seconds (offset is in seconds). */

long __gnat_invalid_tzoff = 259273;

/* Definition of __gnat_localtime_r used by a-calend.adb */

#if defined (__EMX__) || defined (__MINGW32__)

#ifdef CERT

/* For the Cert run times on native Windows we use dummy functions

   for locking and unlocking tasks since we do not support multiple

   threads on this configuration (Cert run time on native Windows). */