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/* Copyright (C) 1995 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#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 <stdlib.h>
/* Return the pathname of the terminal FD is open on, or NULL on errors.
The returned storage is good only until the next call to this function. */
char *
DEFUN(ttyname_r, (fd, name, namelen),
int fd AND char *name AND size_t namelen)
{
static CONST char dev[] = "/dev";
struct stat st;
dev_t mydev;
ino_t myino;
DIR *dirstream;
struct dirent *d;
int save = errno;
int d_namlen;
if (!name || !namelen) return NULL;
if (isatty (fd) && fstat (fd, &st) < 0)
return NULL;
mydev = st.st_dev;
myino = st.st_ino;
dirstream = opendir (dev);
if (dirstream == NULL)
return NULL;
(void) memcpy (name, dev, sizeof (dev) - 1);
name[sizeof (dev) - 1] = '/';
while ((d = readdir (dirstream)) != NULL)
if (d->d_ino == myino)
{
d_namlen = strlen (d->d_name) + 1;
/* Do we need this? */
if (sizeof (dev) + d_namlen > namelen)
{
return NULL;
}
(void) memcpy (&name[sizeof (dev)], d->d_name, d_namlen);
if (stat (name, &st) == 0 && st.st_dev == mydev)
{
(void) closedir (dirstream);
errno = save;
return name;
}
}
(void) closedir (dirstream);
errno = save;
return NULL;
}
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