uclibc-ng/libc/termios/tcgetattr.c

/* Copyright (C) 1992, 1995, 1997, 1998 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, see
   <http://www.gnu.org/licenses/>.  */

#include <features.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>


/* The difference here is that the termios structure used in the
   kernel is not the same as we use in the libc.  Therefore we must
   translate it here.  */
#include "kernel_termios.h"

/* Put the state of FD into *TERMIOS_P.  */
int tcgetattr (int fd, struct termios *termios_p)
{
    struct __kernel_termios k_termios;
    int retval;

    retval = ioctl (fd, TCGETS, &k_termios);
	if(likely(retval == 0)) {
		termios_p->c_iflag = k_termios.c_iflag;
		termios_p->c_oflag = k_termios.c_oflag;
		termios_p->c_cflag = k_termios.c_cflag;
		termios_p->c_lflag = k_termios.c_lflag;
		termios_p->c_line = k_termios.c_line;
#ifdef _HAVE_C_ISPEED
		termios_p->c_ispeed = k_termios.c_ispeed;
#endif
#ifdef _HAVE_C_OSPEED
		termios_p->c_ospeed = k_termios.c_ospeed;
#endif


		if (sizeof (cc_t) == 1 || _POSIX_VDISABLE == 0
			|| (unsigned char) _POSIX_VDISABLE == (unsigned char) -1)
		{
		memset (mempcpy (&termios_p->c_cc[0], &k_termios.c_cc[0],
				__KERNEL_NCCS * sizeof (cc_t)),
			_POSIX_VDISABLE, (NCCS - __KERNEL_NCCS) * sizeof (cc_t));
#if 0
		memset ( (memcpy (&termios_p->c_cc[0], &k_termios.c_cc[0],
				__KERNEL_NCCS * sizeof (cc_t)) + (__KERNEL_NCCS * sizeof (cc_t))) ,
			_POSIX_VDISABLE, (NCCS - __KERNEL_NCCS) * sizeof (cc_t));
#endif
		} else {
		size_t cnt;

		memcpy (&termios_p->c_cc[0], &k_termios.c_cc[0],
			__KERNEL_NCCS * sizeof (cc_t));

		for (cnt = __KERNEL_NCCS; cnt < NCCS; ++cnt)
			termios_p->c_cc[cnt] = _POSIX_VDISABLE;
		}
	}

    return retval;
}
libc_hidden_def(tcgetattr)