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/* GNU Mailutils -- a suite of utilities for electronic mail
   Copyright (C) 2010 Free Software Foundation, Inc.

   This library is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 3, 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>. */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <mailutils/types.h>
#include <mailutils/errno.h>
#include <mailutils/log.h>
#include <mailutils/stream.h>
#include <mailutils/stdstream.h>
#include <mailutils/util.h>

mu_stream_t mu_strin;
mu_stream_t mu_strout;
mu_stream_t mu_strerr;

static void
stdstream_flushall (void *data MU_ARG_UNUSED)
{
  mu_stream_flush (mu_strin);
  mu_stream_flush (mu_strout);
  mu_stream_flush (mu_strerr);
}

void
mu_stdstream_setup ()
{
  int rc;
  int fd;
  int yes = 1;
  
  /* If the streams are already open, close them */
  mu_stream_destroy (&mu_strin);
  mu_stream_destroy (&mu_strout);
  mu_stream_destroy (&mu_strerr);
  
  /* Ensure that first 3 descriptors are open in proper mode */
  fd = open ("/dev/null", O_RDWR);
  switch (fd)
    {
    case 0:
      /* Keep it and try to open 1 */
      fd = open ("/dev/null", O_WRONLY);
      if (fd != 1)
	{
	  if (fd > 2)
	    close (fd);
	  break;
	}

    case 1:
      /* keep it open and try 2 */
      fd = open ("/dev/null", O_WRONLY);
      if (fd != 2)
	close (fd);
      break;

    case 2:
      /* keep it open */;
      break;

    default:
      close (fd);
      break;
    }

  /* Create the corresponding streams */
  rc = mu_stdio_stream_create (&mu_strin, MU_STDIN_FD, 0);
  if (rc)
    {
      fprintf (stderr, "mu_stdio_stream_create(%d): %s\n",
	       MU_STDIN_FD, mu_strerror (rc));
      abort ();
    }
  mu_stream_ioctl (mu_strin, MU_IOCTL_FD, MU_IOCTL_FD_SET_BORROW, &yes);
  
  rc = mu_stdio_stream_create (&mu_strout, MU_STDOUT_FD, 0);
  if (rc)
    {
      fprintf (stderr, "mu_stdio_stream_create(%d): %s\n",
	       MU_STDOUT_FD, mu_strerror (rc));
      abort ();
    }
  mu_stream_ioctl (mu_strout, MU_IOCTL_FD, MU_IOCTL_FD_SET_BORROW, &yes);

  if (mu_stdstream_strerr_create (&mu_strerr, MU_STRERR_STDERR, 0, 0,
				  mu_program_name, NULL))
    abort ();
  mu_onexit (stdstream_flushall, NULL);
}

int
mu_printf (const char *fmt, ...)
{
  int rc;
  va_list ap;

  va_start (ap, fmt);
  rc = mu_stream_vprintf (mu_strout, fmt, ap);
  va_end (ap);
  return rc;
}

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