mirror of
https://github.com/coreutils/coreutils.git
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de678f9321
(rpl_gmtime): New function. Suggestion from Paul Eggert.
122 lines
3.2 KiB
C
122 lines
3.2 KiB
C
/* Work around the bug in some systems whereby gettimeofday clobbers the
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static buffer that localtime uses for it's return value. The gettimeofday
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function from Mac OS X 10.0.4, i.e. Darwin 1.3.7 has this problem.
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The tzset replacement is necessary for at least Solaris 2.5, 2.5.1, and 2.6.
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Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* written by Jim Meyering */
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#include <config.h>
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/* Disable the definitions of these functions (from config.h)
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so we can use the library versions here. */
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#undef gettimeofday
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#undef gmtime
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#undef localtime
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#undef tzset
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#include <sys/types.h>
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#if TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# if HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#include <stdlib.h>
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static struct tm *localtime_buffer_addr;
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/* This is a wrapper for localtime. It is used only on systems for which
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gettimeofday clobbers the static buffer used for localtime's result.
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On the first call, record the address of the static buffer that
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localtime uses for its result. */
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struct tm *
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rpl_localtime (const time_t *timep)
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{
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struct tm *tm = localtime (timep);
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if (! localtime_buffer_addr)
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localtime_buffer_addr = tm;
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return tm;
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}
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/* Same as above, since gmtime and localtime use the same buffer. */
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struct tm *
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rpl_gmtime (const time_t *timep)
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{
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struct tm *tm = gmtime (timep);
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if (! localtime_buffer_addr)
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localtime_buffer_addr = tm;
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return tm;
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}
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/* This is a wrapper for gettimeofday. It is used only on systems for which
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gettimeofday clobbers the static buffer used for localtime's result.
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Save and restore the contents of the buffer used for localtime's result
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around the call to gettimeofday. */
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int
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rpl_gettimeofday (struct timeval *tv, struct timezone *tz)
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{
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struct tm save;
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int result;
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if (! localtime_buffer_addr)
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{
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time_t t = 0;
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localtime_buffer_addr = localtime (&t);
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}
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save = *localtime_buffer_addr;
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result = gettimeofday (tv, tz);
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*localtime_buffer_addr = save;
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return result;
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}
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/* This is a wrapper for tzset. It is used only on systems for which
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tzset may clobber the static buffer used for localtime's result.
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Save and restore the contents of the buffer used for localtime's
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result around the call to tzset. */
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void
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rpl_tzset (void)
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{
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struct tm save;
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if (! localtime_buffer_addr)
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{
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time_t t = 0;
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localtime_buffer_addr = localtime (&t);
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}
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save = *localtime_buffer_addr;
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tzset ();
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*localtime_buffer_addr = save;
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}
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