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/* Copyright (C) 1991,92,93,1995-1999,2000,2001 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C 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 2.1 of the License, or (at your option) any later version.

   The GNU C 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 the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <errno.h>

#include <limits.h>

#include <stddef.h>

#include <dirent.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#include <string.h>

#include <stdio.h>

#include <stdlib.h>

#include <machine/weakalias.h>

static int getttyname_r (char *buf, size_t buflen,

                         dev_t mydev, ino64_t myino, int save,

                         int *dostat);

extern struct dirent64 *__readdir64 (DIR *);

static int

getttyname_r (char *buf, size_t buflen, dev_t mydev, ino64_t myino,

              int save, int *dostat)

{

  struct stat64 st;

  DIR *dirstream;

  struct dirent64 *d;

  size_t devlen = strlen (buf);

  dirstream = opendir (buf);

  if (dirstream == NULL)

    {

      *dostat = -1;

      return errno;

    }

  while ((d = __readdir64 (dirstream)) != NULL)

    {

      if ((d->d_ino == myino || *dostat)

          && strcmp (d->d_name, "stdin")

          && strcmp (d->d_name, "stdout")

          && strcmp (d->d_name, "stderr"))

        {

          size_t needed = strlen (d->d_name) + 1;

          if (needed > buflen)

            {

              *dostat = -1;

              (void) closedir (dirstream);

              __set_errno (ERANGE);

              return ERANGE;

            }

          strncpy (buf + devlen, d->d_name, needed);

          if (stat64 (buf, &st) == 0

#ifdef _STATBUF_ST_RDEV

              && S_ISCHR (st.st_mode) && st.st_rdev == mydev

#else

              && d->d_ino == myino && st.st_dev == mydev

#endif

             )

            {

              (void) closedir (dirstream);

              __set_errno (save);

              return 0;

            }

        }

    }

  (void) closedir (dirstream);

  __set_errno (save);

  /* It is not clear what to return in this case.  `isatty' says FD

     refers to a TTY but no entry in /dev has this inode.  */

  return ENOTTY;

}

/* Store at most BUFLEN character of the pathname of the terminal FD is

   open on in BUF.  Return 0 on success,  otherwise an error number.  */

int

__ttyname_r (int fd, char *buf, size_t buflen)

{

  char procname[30];

  struct stat64 st, st1;

  int dostat = 0;

  int save = errno;

  int ret;

  /* Test for the absolute minimal size.  This makes life easier inside

     the loop.  */

  if (!buf)

    {

      __set_errno (EINVAL);

      return EINVAL;

    }

  if (buflen < sizeof ("/dev/pts/"))

    {

      __set_errno (ERANGE);

      return ERANGE;

    }

  if (!isatty (fd))

    {

      __set_errno (ENOTTY);

      return ENOTTY;

    }

  /* We try using the /proc filesystem.  */

  sprintf (procname, "/proc/self/fd/%d", fd);

  ret = readlink (procname, buf, buflen - 1);

  if (ret != -1 && buf[0] != '[')

    {

      buf[ret] = '\0';

      return 0;

    }

  if (ret == -1 && errno == ENAMETOOLONG)

    {

      __set_errno (ERANGE);

      return ERANGE;

    }

  if (fstat64 (fd, &st) < 0)

    return errno;

  /* Prepare the result buffer.  */

  memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/"));

  buflen -= sizeof ("/dev/pts/") - 1;

  if (stat64 (buf, &st1) == 0 && S_ISDIR (st1.st_mode))

    {

#ifdef _STATBUF_ST_RDEV

      ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,

                          &dostat);

#else

      ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,

                          &dostat);

#endif

    }

  else

    {

      __set_errno (save);

      ret = ENOENT;

    }

  if (ret && dostat != -1)

    {

      buf[sizeof ("/dev/") - 1] = '\0';

      buflen += sizeof ("pts/") - 1;

#ifdef _STATBUF_ST_RDEV

      ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,

                          &dostat);

#else

      ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,

                          &dostat);

#endif

    }

  if (ret && dostat != -1)

    {

      buf[sizeof ("/dev/") - 1] = '\0';

      dostat = 1;

#ifdef _STATBUF_ST_RDEV

      ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino,

                          save, &dostat);

#else

      ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino,

                          save, &dostat);

#endif

    }

  return ret;

}

weak_alias (__ttyname_r, ttyname_r)