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Diffstat (limited to 'time/localtime_r.c')
-rw-r--r-- | time/localtime_r.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/time/localtime_r.c b/time/localtime_r.c new file mode 100644 index 0000000..0bd1a02 --- /dev/null +++ b/time/localtime_r.c @@ -0,0 +1,60 @@ +/* + * (C)2012 Michael Duane Rice All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. Redistributions in binary + * form must reproduce the above copyright notice, this list of conditions + * and the following disclaimer in the documentation and/or other materials + * provided with the distribution. Neither the name of the copyright holders + * nor the names of contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* $Id: localtime_r.c 2318 2013-03-30 11:59:28Z swfltek $ */ + +/* + Re entrant version of localtime(). Given a binary UTC time stamp, add the time + zone and Daylight savings offset, then break it down into calendar time. +*/ + +#include <time.h> + +extern long __utc_offset; + +extern int (*__dst_ptr) (const time_t *, int32_t *); + +void +localtime_r(const time_t * timer, struct tm * timeptr) +{ + time_t lt; + int16_t dst; + + dst = -1; + + if (__dst_ptr) + dst = __dst_ptr(timer, &__utc_offset); + + lt = *timer + __utc_offset; + + if (dst > 0) + lt += dst; + + gmtime_r(<, timeptr); + timeptr->tm_isdst = dst; +} |