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#ifndef _NO_TTYNAME

/*

 * 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.

 * 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.

 */

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <dirent.h>

#include <unistd.h>

#include <string.h>

#include <paths.h>

#include <_syslist.h>

#include <errno.h>

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

/*

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

 */

int

_DEFUN( ttyname_r,(fd, name, namesize),

        int fd _AND

        char   *name _AND

        size_t  namesize)

{

  struct stat sb;

  struct dirent *dirp;

  DIR *dp;

  struct stat dsb;

  char buf[sizeof(ttyname_buf)];

  /* Must be a terminal. */

  if (!isatty(fd))

    return ENOTTY;

  /* Must be a character device. */

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

    return ENOTTY;

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

    return EBADF;

  strcpy(buf, _PATH_DEV);

  while ((dirp = readdir (dp)) != NULL)

    {

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

        continue;

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

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

          sb.st_ino != dsb.st_ino)

        continue;

      (void) closedir (dp);

      if(strlen(buf) < namesize)  /* < to account for terminating null */

        {

        strcpy(name, buf);

        return 0;

        }

      else

        {

        return ERANGE;

        }

    }

  (void) closedir (dp);

  return EBADF;

}

/*

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

 */

char *

_DEFUN( ttyname,(fd),

        int fd)

{

  register int  fail;

  register char *ret=NULL;

  fail = ttyname_r( fd, ttyname_buf, sizeof(ttyname_buf) );

  if ( fail )  errno = fail;

   else  ret = ttyname_buf;

  return ret;

}

#endif /* !_NO_TTYNAME  */