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/*

 * This file was copied from newlib-1.8.2/newlib/unix/ttyname.c

 * and transformed into ttyname_r().

 *

 * Copyright (c) 1988 The Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *  $Id: ttyname_r.c,v 1.2 2001-09-27 12:01:15 chris Exp $

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)ttyname.c   5.10 (Berkeley) 5/6/91";

#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <dirent.h>

#include <termios.h>

#include <unistd.h>

#include <paths.h>

#include <_syslist.h>

#include <errno.h>

#include "libio_.h"

/*

 *  ttyname_r() - POSIX 1003.1b 4.7.2 - Demetermine Terminal Device Name

 */

int ttyname_r(

  int   fd,

  char *name,

  int   namesize

)

{

  struct stat sb;

  struct termios tty;

  struct dirent *dirp;

  DIR *dp;

  struct stat dsb;

  char *rval;

  /* Must be a terminal. */

  if (tcgetattr (fd, &tty) < 0)

    set_errno_and_return_minus_one(EBADF);

  /* Must be a character device. */

  if (_fstat (fd, &sb) || !S_ISCHR (sb.st_mode))

    set_errno_and_return_minus_one(EBADF);

  if ((dp = opendir (_PATH_DEV)) == NULL)

    set_errno_and_return_minus_one(EBADF);

  for (rval = NULL; (dirp = readdir (dp)) != NULL ;)

    {

      if (dirp->d_ino != sb.st_ino)

        continue;

      strcpy (name + sizeof (_PATH_DEV) - 1, dirp->d_name);

      if (stat (name, &dsb) || sb.st_dev != dsb.st_dev ||

          sb.st_ino != dsb.st_ino)

        continue;

      (void) closedir (dp);

      rval = name;

      break;

    }

  (void) closedir (dp);

  return 0;

}

static char buf[sizeof (_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;

/*

 *  ttyname() - POSIX 1003.1b 4.7.2 - Demetermine Terminal Device Name

 */

char *ttyname(

  int fd

)

{

  if ( !ttyname_r( fd, buf, sizeof(buf) ) )

    return buf;

  return NULL;

}