/* Provide access to the last buffer returned by localtime() or gmtime().

   Copyright (C) 2001-2003, 2005-2007, 2009-2020 Free Software Foundation, Inc.

   This program 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, or (at your option)

   any later version.

   This program 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 this program; if not, see <https://www.gnu.org/licenses/>.  */

/* written by Jim Meyering */

#include <config.h>

/* Specification.  */

#include "localtime-buffer.h"

#if GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME

static struct tm tm_zero_buffer;

struct tm *localtime_buffer_addr = &tm_zero_buffer;

/* This is a wrapper for localtime.

   On the first call, record the address of the static buffer that

   localtime uses for its result.  */

struct tm *

rpl_localtime (time_t const *timep)

#undef localtime

{

  struct tm *tm = localtime (timep);

  if (localtime_buffer_addr == &tm_zero_buffer)

    localtime_buffer_addr = tm;

  return tm;

}

/* Same as above, since gmtime and localtime use the same buffer.  */

struct tm *

rpl_gmtime (time_t const *timep)

#undef gmtime

{

  struct tm *tm = gmtime (timep);

  if (localtime_buffer_addr == &tm_zero_buffer)

    localtime_buffer_addr = tm;

  return tm;

}

#endif