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gmtoff_gmtime.c
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gmtoff_gmtime.c
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/* gmtoff_tm.c - Get offset from GMT by calling gmtime and subtracting
*
* Copyright (c) 1994-2008 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
/*
* Returns the GMT offset of the struct tm 'tm', obtained from 'time'.
*/
EXPORTED int gmtoff_of(struct tm *tm, time_t time)
{
struct tm local, gmt;
struct tm *gtm;
long offset;
local = *tm;
gtm = gmtime(&time);
gmt = *gtm;
/* Assume we are never more than 24 hours away. */
offset = local.tm_yday - gmt.tm_yday;
if (offset > 1) {
offset = -24;
} else if (offset < -1) {
offset = 24;
} else {
offset *= 24;
}
/* Scale in the hours and minutes; ignore seconds. */
offset += local.tm_hour - gmt.tm_hour;
offset *= 60;
offset += local.tm_min - gmt.tm_min;
/* Restore the data in the struct 'tm' points to */
*tm = local;
return offset * 60;
}

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