/* Copyright (C) 1995-2018 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 <errno.h>

#include <limits.h>

#include <sys/time.h>

#include <sys/timex.h>

#define MAX_SEC	(INT_MAX / 1000000L - 2)

#define MIN_SEC	(INT_MIN / 1000000L + 2)

#ifndef MOD_OFFSET

#define modes mode

#endif

#ifndef TIMEVAL

#define TIMEVAL timeval

#endif

#ifndef TIMEX

#define TIMEX timex

#endif

#ifndef ADJTIME

#define ADJTIME __adjtime

#endif

#ifndef ADJTIMEX

#define NO_LOCAL_ADJTIME

#define ADJTIMEX(x) __adjtimex (x)

#endif

#ifndef LINKAGE

#define LINKAGE

#endif

LINKAGE int

ADJTIME (const struct TIMEVAL *itv, struct TIMEVAL *otv)

{

  struct TIMEX tntx;

  if (itv)

    {

      struct TIMEVAL tmp;

      /* We will do some check here. */

      tmp.tv_sec = itv->tv_sec + itv->tv_usec / 1000000L;

      tmp.tv_usec = itv->tv_usec % 1000000L;

      if (tmp.tv_sec > MAX_SEC || tmp.tv_sec < MIN_SEC)

	return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);

      tntx.offset = tmp.tv_usec + tmp.tv_sec * 1000000L;

      tntx.modes = ADJ_OFFSET_SINGLESHOT;

    }

  else

    tntx.modes = ADJ_OFFSET_SS_READ;

  if (__glibc_unlikely (ADJTIMEX (&tntx) < 0))

    return -1;

  if (otv)

    {

      if (tntx.offset < 0)

	{

	  otv->tv_usec = -(-tntx.offset % 1000000);

	  otv->tv_sec  = -(-tntx.offset / 1000000);

	}

      else

	{

	  otv->tv_usec = tntx.offset % 1000000;

	  otv->tv_sec  = tntx.offset / 1000000;

	}

    }

  return 0;

}

#ifdef NO_LOCAL_ADJTIME

weak_alias (__adjtime, adjtime)

#endif