mirror of
https://github.com/coreutils/coreutils.git
synced 2024-12-04 07:24:22 +08:00
124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/* Work around the bug in some systems whereby gettimeofday clobbers the
|
|
static buffer that localtime uses for it's return value. The gettimeofday
|
|
function from Mac OS X 10.0.4, i.e. Darwin 1.3.7 has this problem.
|
|
The tzset replacement is necessary for at least Solaris 2.5, 2.5.1, and 2.6.
|
|
Copyright (C) 2001, 2002, 2003 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 2, 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, write to the Free Software Foundation,
|
|
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
|
|
|
|
/* written by Jim Meyering */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
/* Disable the definitions of these functions (from config.h)
|
|
so we can use the library versions here. */
|
|
#undef gettimeofday
|
|
#undef gmtime
|
|
#undef localtime
|
|
#undef tzset
|
|
|
|
#include <sys/types.h>
|
|
|
|
#if TIME_WITH_SYS_TIME
|
|
# include <sys/time.h>
|
|
# include <time.h>
|
|
#else
|
|
# if HAVE_SYS_TIME_H
|
|
# include <sys/time.h>
|
|
# else
|
|
# include <time.h>
|
|
# endif
|
|
#endif
|
|
|
|
#include <stdlib.h>
|
|
|
|
static struct tm *localtime_buffer_addr;
|
|
|
|
/* This is a wrapper for localtime. It is used only on systems for which
|
|
gettimeofday clobbers the static buffer used for localtime's result.
|
|
|
|
On the first call, record the address of the static buffer that
|
|
localtime uses for its result. */
|
|
|
|
struct tm *
|
|
rpl_localtime (const time_t *timep)
|
|
{
|
|
struct tm *tm = localtime (timep);
|
|
|
|
if (! localtime_buffer_addr)
|
|
localtime_buffer_addr = tm;
|
|
|
|
return tm;
|
|
}
|
|
|
|
/* Same as above, since gmtime and localtime use the same buffer. */
|
|
struct tm *
|
|
rpl_gmtime (const time_t *timep)
|
|
{
|
|
struct tm *tm = gmtime (timep);
|
|
|
|
if (! localtime_buffer_addr)
|
|
localtime_buffer_addr = tm;
|
|
|
|
return tm;
|
|
}
|
|
|
|
/* This is a wrapper for gettimeofday. It is used only on systems for which
|
|
gettimeofday clobbers the static buffer used for localtime's result.
|
|
|
|
Save and restore the contents of the buffer used for localtime's result
|
|
around the call to gettimeofday. */
|
|
|
|
int
|
|
rpl_gettimeofday (struct timeval *tv, struct timezone *tz)
|
|
{
|
|
struct tm save;
|
|
int result;
|
|
|
|
if (! localtime_buffer_addr)
|
|
{
|
|
time_t t = 0;
|
|
localtime_buffer_addr = localtime (&t);
|
|
}
|
|
|
|
save = *localtime_buffer_addr;
|
|
result = gettimeofday (tv, tz);
|
|
*localtime_buffer_addr = save;
|
|
|
|
return result;
|
|
}
|
|
|
|
/* This is a wrapper for tzset. It is used only on systems for which
|
|
tzset may clobber the static buffer used for localtime's result.
|
|
Save and restore the contents of the buffer used for localtime's
|
|
result around the call to tzset. */
|
|
void
|
|
rpl_tzset (void)
|
|
{
|
|
struct tm save;
|
|
|
|
if (! localtime_buffer_addr)
|
|
{
|
|
time_t t = 0;
|
|
localtime_buffer_addr = localtime (&t);
|
|
}
|
|
|
|
save = *localtime_buffer_addr;
|
|
tzset ();
|
|
*localtime_buffer_addr = save;
|
|
}
|