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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /time/localtime.c
downloadglibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.tar.gz
initial import
Diffstat (limited to 'time/localtime.c')
-rw-r--r--time/localtime.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/time/localtime.c b/time/localtime.c
new file mode 100644
index 0000000000..3377b80197
--- /dev/null
+++ b/time/localtime.c
@@ -0,0 +1,84 @@
+/* Copyright (C) 1991, 1992, 1993 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <localeinfo.h>
+#include <stddef.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+
+#ifndef HAVE_GNU_LD
+#define __tzname tzname
+#define __daylight daylight
+#define __timezone timezone
+#endif
+
+/* Return the `struct tm' representation of *TIMER in the local timezone. */
+struct tm *
+DEFUN(localtime, (timer), CONST time_t *timer)
+{
+ extern int __use_tzfile;
+ extern int EXFUN(__tz_compute, (time_t timer, struct tm *tp));
+ extern int EXFUN(__tzfile_compute, (time_t timer,
+ long int *leap_correct, int *leap_hit));
+ register struct tm *tp;
+ long int leap_correction;
+ int leap_extra_secs;
+
+ if (timer == NULL)
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ {
+ /* Make sure the database is initialized. */
+ extern int __tzset_run;
+ if (! __tzset_run)
+ __tzset ();
+ }
+
+ if (__use_tzfile)
+ {
+ if (! __tzfile_compute (*timer, &leap_correction, &leap_extra_secs))
+ return NULL;
+ }
+ else
+ {
+ tp = gmtime (timer);
+ if (tp == NULL)
+ return NULL;
+
+ if (! __tz_compute (*timer, tp))
+ return NULL;
+
+ leap_correction = 0L;
+ leap_extra_secs = 0;
+ }
+
+ tp = __offtime (timer, __timezone - leap_correction);
+ tp->tm_sec += leap_extra_secs;
+ tp->tm_isdst = __daylight;
+ tp->tm_gmtoff = __timezone;
+ tp->tm_zone = __tzname[__daylight];
+ return tp;
+}