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162 lines
5.1 KiB
C
Executable File
162 lines
5.1 KiB
C
Executable File
/* $OpenBSD: o_time.c,v 1.15 2014/06/12 15:49:27 deraadt Exp $ */
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/* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
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* project 2001.
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*/
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 2008.
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*/
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/* ====================================================================
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* Copyright (c) 2001 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <string.h>
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#include "o_time.h"
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/* Take a tm structure and add an offset to it. This avoids any OS issues
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* with restricted date types and overflows which cause the year 2038
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* problem.
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*/
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#define SECS_PER_DAY (24 * 60 * 60)
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static long date_to_julian(int y, int m, int d);
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static void julian_to_date(long jd, int *y, int *m, int *d);
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int
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OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
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{
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int offset_hms, offset_day;
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long time_jd;
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int time_year, time_month, time_day;
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/* split offset into days and day seconds */
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offset_day = offset_sec / SECS_PER_DAY;
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/* Avoid sign issues with % operator */
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offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
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offset_day += off_day;
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/* Add current time seconds to offset */
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offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
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/* Adjust day seconds if overflow */
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if (offset_hms >= SECS_PER_DAY) {
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offset_day++;
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offset_hms -= SECS_PER_DAY;
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} else if (offset_hms < 0) {
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offset_day--;
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offset_hms += SECS_PER_DAY;
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}
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/* Convert date of time structure into a Julian day number.
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*/
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time_year = tm->tm_year + 1900;
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time_month = tm->tm_mon + 1;
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time_day = tm->tm_mday;
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time_jd = date_to_julian(time_year, time_month, time_day);
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/* Work out Julian day of new date */
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time_jd += offset_day;
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if (time_jd < 0)
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return 0;
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/* Convert Julian day back to date */
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julian_to_date(time_jd, &time_year, &time_month, &time_day);
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if (time_year < 1900 || time_year > 9999)
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return 0;
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/* Update tm structure */
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tm->tm_year = time_year - 1900;
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tm->tm_mon = time_month - 1;
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tm->tm_mday = time_day;
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tm->tm_hour = offset_hms / 3600;
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tm->tm_min = (offset_hms / 60) % 60;
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tm->tm_sec = offset_hms % 60;
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return 1;
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}
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/* Convert date to and from julian day
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* Uses Fliegel & Van Flandern algorithm
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*/
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static long
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date_to_julian(int y, int m, int d)
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{
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return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
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(367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
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(3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 +
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d - 32075;
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}
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static void
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julian_to_date(long jd, int *y, int *m, int *d)
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{
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long L = jd + 68569;
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long n = (4 * L) / 146097;
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long i, j;
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L = L - (146097 * n + 3) / 4;
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i = (4000 * (L + 1)) / 1461001;
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L = L - (1461 * i) / 4 + 31;
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j = (80 * L) / 2447;
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*d = L - (2447 * j) / 80;
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L = j / 11;
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*m = j + 2 - (12 * L);
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*y = 100 * (n - 49) + i + L;
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}
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