77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/* time_util.c
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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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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*
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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
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "time_util.h"
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/* converts a broken down date representation, relative to UTC,
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* to a timestamp; it uses timegm() if it's available.
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* Copied from Glib source gtimer.c
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*/
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time_t
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mktime_utc(struct tm *tm)
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{
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#ifndef HAVE_TIMEGM
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time_t retval;
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static const int days_before[] =
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{
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
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};
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int yr;
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if (tm->tm_mon < 0 || tm->tm_mon > 11)
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return (time_t) -1;
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retval = (tm->tm_year - 70) * 365;
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/* count number of leap years */
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yr = tm->tm_year + 1900;
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if (tm->tm_mon + 1 < 3 && (yr % 4) == 0 && ((yr % 100) != 0 || (yr % 400) == 0))
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yr--;
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retval += (((yr / 4) - (yr / 100) + (yr / 400)) - 477); /* 477 = ((1970 / 4) - (1970 / 100) + (1970 / 400)) */
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retval += days_before[tm->tm_mon] + tm->tm_mday - 1;
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retval = ((((retval * 24) + tm->tm_hour) * 60) + tm->tm_min) * 60 + tm->tm_sec;
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return retval;
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#else
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return timegm(tm);
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#endif /* !HAVE_TIMEGM */
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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