2 * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include <openssl/e_os2.h>
12 #include <openssl/crypto.h>
14 struct tm *OPENSSL_gmtime(const time_t *timer, struct tm *result)
18 #if defined(OPENSSL_THREADS) && defined(OPENSSL_SYS_VMS)
21 * On VMS, gmtime_r() takes a 32-bit pointer as second argument.
22 * Since we can't know that |result| is in a space that can easily
23 * translate to a 32-bit pointer, we must store temporarly on stack
24 * and copy the result. The stack is always reachable with 32-bit
27 #if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE
28 # pragma pointer_size save
29 # pragma pointer_size 32
31 struct tm data, *ts2 = &data;
32 #if defined OPENSSL_SYS_VMS && __INITIAL_POINTER_SIZE
33 # pragma pointer_size restore
35 if (gmtime_r(timer, ts2) == NULL)
37 memcpy(result, ts2, sizeof(struct tm));
40 #elif defined(OPENSSL_THREADS) && !defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_SYS_MACOSX)
41 if (gmtime_r(timer, result) == NULL)
49 memcpy(result, ts, sizeof(struct tm));
56 * Take a tm structure and add an offset to it. This avoids any OS issues
57 * with restricted date types and overflows which cause the year 2038
61 #define SECS_PER_DAY (24 * 60 * 60)
63 static long date_to_julian(int y, int m, int d);
64 static void julian_to_date(long jd, int *y, int *m, int *d);
65 static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
66 long *pday, int *psec);
68 int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
70 int time_sec, time_year, time_month, time_day;
73 /* Convert time and offset into Julian day and seconds */
74 if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec))
77 /* Convert Julian day back to date */
79 julian_to_date(time_jd, &time_year, &time_month, &time_day);
81 if (time_year < 1900 || time_year > 9999)
84 /* Update tm structure */
86 tm->tm_year = time_year - 1900;
87 tm->tm_mon = time_month - 1;
88 tm->tm_mday = time_day;
90 tm->tm_hour = time_sec / 3600;
91 tm->tm_min = (time_sec / 60) % 60;
92 tm->tm_sec = time_sec % 60;
98 int OPENSSL_gmtime_diff(int *pday, int *psec,
99 const struct tm *from, const struct tm *to)
101 int from_sec, to_sec, diff_sec;
102 long from_jd, to_jd, diff_day;
103 if (!julian_adj(from, 0, 0, &from_jd, &from_sec))
105 if (!julian_adj(to, 0, 0, &to_jd, &to_sec))
107 diff_day = to_jd - from_jd;
108 diff_sec = to_sec - from_sec;
109 /* Adjust differences so both positive or both negative */
110 if (diff_day > 0 && diff_sec < 0) {
112 diff_sec += SECS_PER_DAY;
114 if (diff_day < 0 && diff_sec > 0) {
116 diff_sec -= SECS_PER_DAY;
120 *pday = (int)diff_day;
128 /* Convert tm structure and offset into julian day and seconds */
129 static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
130 long *pday, int *psec)
132 int offset_hms, offset_day;
134 int time_year, time_month, time_day;
135 /* split offset into days and day seconds */
136 offset_day = offset_sec / SECS_PER_DAY;
137 /* Avoid sign issues with % operator */
138 offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
139 offset_day += off_day;
140 /* Add current time seconds to offset */
141 offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
142 /* Adjust day seconds if overflow */
143 if (offset_hms >= SECS_PER_DAY) {
145 offset_hms -= SECS_PER_DAY;
146 } else if (offset_hms < 0) {
148 offset_hms += SECS_PER_DAY;
152 * Convert date of time structure into a Julian day number.
155 time_year = tm->tm_year + 1900;
156 time_month = tm->tm_mon + 1;
157 time_day = tm->tm_mday;
159 time_jd = date_to_julian(time_year, time_month, time_day);
161 /* Work out Julian day of new date */
162 time_jd += offset_day;
173 * Convert date to and from julian day Uses Fliegel & Van Flandern algorithm
175 static long date_to_julian(int y, int m, int d)
177 return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
178 (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
179 (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075;
182 static void julian_to_date(long jd, int *y, int *m, int *d)
185 long n = (4 * L) / 146097;
188 L = L - (146097 * n + 3) / 4;
189 i = (4000 * (L + 1)) / 1461001;
190 L = L - (1461 * i) / 4 + 31;
192 *d = L - (2447 * j) / 80;
194 *m = j + 2 - (12 * L);
195 *y = 100 * (n - 49) + i + L;