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/* 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 General Public License as published by
the Free Software Foundation; either version 3, 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 General Public License for more details.
You should have received a copy of the GNU 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
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