/* Determine name of the slave side of a pseudo-terminal.
- Copyright (C) 1998, 2002, 2010 Free Software Foundation, Inc.
+ Copyright (C) 1998, 2002, 2010-2013 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <stdlib.h>
-#include <errno.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#ifdef _LIBC
-# include <paths.h>
-#else
-# ifndef _PATH_TTY
-# define _PATH_TTY "/dev/tty"
-# endif
-# ifndef _PATH_DEV
-# define _PATH_DEV "/dev/"
-# endif
-
-# define __set_errno(e) errno = (e)
-# define __isatty isatty
-# define __stat stat
-# define __ttyname_r ttyname_r
-
-static int __ptsname_r (int fd, char *buf, size_t buflen);
-#endif
-
-
-/* Static buffer for `ptsname'. */
-static char buffer[sizeof (_PATH_TTY) + 2];
+/* Static buffer for 'ptsname'. */
+static char buffer[64];
/* Return the pathname of the pseudo terminal slave associated with
char *
ptsname (int fd)
{
- return __ptsname_r (fd, buffer, sizeof (buffer)) != 0 ? NULL : buffer;
-}
-
-
-/* Store at most BUFLEN characters of the pathname of the slave pseudo
- terminal associated with the master FD is open on in BUF.
- Return 0 on success, otherwise an error number. */
-static int
-__ptsname_r (int fd, char *buf, size_t buflen)
-{
- int save_errno = errno;
- struct stat st;
-
- if (buf == NULL)
- {
- __set_errno (EINVAL);
- return EINVAL;
- }
-
- if (!__isatty (fd))
- /* We rely on isatty to set errno properly (i.e. EBADF or ENOTTY). */
- return errno;
-
- if (buflen < strlen (_PATH_TTY) + 3)
- {
- __set_errno (ERANGE);
- return ERANGE;
- }
-
- if (__ttyname_r (fd, buf, buflen) != 0)
- return errno;
-
- buf[sizeof (_PATH_DEV) - 1] = 't';
-
- if (__stat (buf, &st) < 0)
- return errno;
-
- __set_errno (save_errno);
- return 0;
+ return ptsname_r (fd, buffer, sizeof (buffer)) != 0 ? NULL : buffer;
}