[thirdparty/openssl.git] / crypto / o_time.c

/* crypto/o_time.c -*- mode:C; c-file-style: "eay" -*- */
/*
 * Written by Richard Levitte (richard@levitte.org) for the OpenSSL project
 * 2001.
 */
/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
 * 2008.
 */
/* ====================================================================
 * Copyright (c) 2001 The OpenSSL Project.  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. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <openssl/e_os2.h>
#include <string.h>
#include <openssl/crypto.h>

#ifdef OPENSSL_SYS_VMS
# if __CRTL_VER >= 70000000 && \
     (defined _POSIX_C_SOURCE || !defined _ANSI_C_SOURCE)
#  define VMS_GMTIME_OK
# endif
# ifndef VMS_GMTIME_OK
#  include <libdtdef.h>
#  include <lib$routines.h>
#  include <lnmdef.h>
#  include <starlet.h>
#  include <descrip.h>
#  include <stdlib.h>
# endif                         /* ndef VMS_GMTIME_OK */
#endif

struct tm *OPENSSL_gmtime(const time_t *timer, struct tm *result)
{
    struct tm *ts = NULL;

#if defined(OPENSSL_THREADS) && !defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_SYS_OS2) && (!defined(OPENSSL_SYS_VMS) || defined(gmtime_r)) && !defined(OPENSSL_SYS_MACOSX)
    /*
     * should return &data, but doesn't on some systems, so we don't even
     * look at the return value
     */
    gmtime_r(timer, result);
    ts = result;
#elif !defined(OPENSSL_SYS_VMS) || defined(VMS_GMTIME_OK)
    ts = gmtime(timer);
    if (ts == NULL)
        return NULL;

    memcpy(result, ts, sizeof(struct tm));
    ts = result;
#endif
#if defined( OPENSSL_SYS_VMS) && !defined( VMS_GMTIME_OK)
    if (ts == NULL) {
        static $DESCRIPTOR(tabnam, "LNM$DCL_LOGICAL");
        static $DESCRIPTOR(lognam, "SYS$TIMEZONE_DIFFERENTIAL");
        char logvalue[256];
        unsigned int reslen = 0;
        struct {
            short buflen;
            short code;
            void *bufaddr;
            unsigned int *reslen;
        } itemlist[] = {
            {
                0, LNM$_STRING, 0, 0
            },
            {
                0, 0, 0, 0
            },
        };
        int status;
        time_t t;

        /* Get the value for SYS$TIMEZONE_DIFFERENTIAL */
        itemlist[0].buflen = sizeof(logvalue);
        itemlist[0].bufaddr = logvalue;
        itemlist[0].reslen = &reslen;
        status = sys$trnlnm(0, &tabnam, &lognam, 0, itemlist);
        if (!(status & 1))
            return NULL;
        logvalue[reslen] = '\0';

        t = *timer;

/* The following is extracted from the DEC C header time.h */
        /*
         **  Beginning in OpenVMS Version 7.0 mktime, time, ctime, strftime
         **  have two implementations.  One implementation is provided
         **  for compatibility and deals with time in terms of local time,
         **  the other __utc_* deals with time in terms of UTC.
         */
        /*
         * We use the same conditions as in said time.h to check if we should
         * assume that t contains local time (and should therefore be
         * adjusted) or UTC (and should therefore be left untouched).
         */
# if __CRTL_VER < 70000000 || defined _VMS_V6_SOURCE
        /* Get the numerical value of the equivalence string */
        status = atoi(logvalue);

        /* and use it to move time to GMT */
        t -= status;
# endif

        /* then convert the result to the time structure */

        /*
         * Since there was no gmtime_r() to do this stuff for us, we have to
         * do it the hard way.
         */
        {
                /*-
                 * The VMS epoch is the astronomical Smithsonian date,
                   if I remember correctly, which is November 17, 1858.
                   Furthermore, time is measure in thenths of microseconds
                   and stored in quadwords (64 bit integers).  unix_epoch
                   below is January 1st 1970 expressed as a VMS time.  The
                   following code was used to get this number:

                   #include <stdio.h>
                   #include <stdlib.h>
                   #include <lib$routines.h>
                   #include <starlet.h>

                   main()
                   {
                     unsigned long systime[2];
                     unsigned short epoch_values[7] =
                       { 1970, 1, 1, 0, 0, 0, 0 };

                     lib$cvt_vectim(epoch_values, systime);

                     printf("%u %u", systime[0], systime[1]);
                   }
                */
            unsigned long unix_epoch[2] = { 1273708544, 8164711 };
            unsigned long deltatime[2];
            unsigned long systime[2];
            struct vms_vectime {
                short year, month, day, hour, minute, second, centi_second;
            } time_values;
            long operation;

            /*
             * Turn the number of seconds since January 1st 1970 to an
             * internal delta time. Note that lib$cvt_to_internal_time() will
             * assume that t is signed, and will therefore break on 32-bit
             * systems some time in 2038.
             */
            operation = LIB$K_DELTA_SECONDS;
            status = lib$cvt_to_internal_time(&operation, &t, deltatime);

            /*
             * Add the delta time with the Unix epoch and we have the current
             * UTC time in internal format
             */
            status = lib$add_times(unix_epoch, deltatime, systime);

            /* Turn the internal time into a time vector */
            status = sys$numtim(&time_values, systime);

            /* Fill in the struct tm with the result */
            result->tm_sec = time_values.second;
            result->tm_min = time_values.minute;
            result->tm_hour = time_values.hour;
            result->tm_mday = time_values.day;
            result->tm_mon = time_values.month - 1;
            result->tm_year = time_values.year - 1900;

            operation = LIB$K_DAY_OF_WEEK;
            status = lib$cvt_from_internal_time(&operation,
                                                &result->tm_wday, systime);
            result->tm_wday %= 7;

            operation = LIB$K_DAY_OF_YEAR;
            status = lib$cvt_from_internal_time(&operation,
                                                &result->tm_yday, systime);
            result->tm_yday--;

            result->tm_isdst = 0; /* There's no way to know... */

            ts = result;
        }
    }
#endif
    return ts;
}

/*
 * Take a tm structure and add an offset to it. This avoids any OS issues
 * with restricted date types and overflows which cause the year 2038
 * problem.
 */

#define SECS_PER_DAY (24 * 60 * 60)

static long date_to_julian(int y, int m, int d);
static void julian_to_date(long jd, int *y, int *m, int *d);
static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
                      long *pday, int *psec);

int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
{
    int time_sec, time_year, time_month, time_day;
    long time_jd;

    /* Convert time and offset into julian day and seconds */
    if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec))
        return 0;

    /* Convert Julian day back to date */

    julian_to_date(time_jd, &time_year, &time_month, &time_day);

    if (time_year < 1900 || time_year > 9999)
        return 0;

    /* Update tm structure */

    tm->tm_year = time_year - 1900;
    tm->tm_mon = time_month - 1;
    tm->tm_mday = time_day;

    tm->tm_hour = time_sec / 3600;
    tm->tm_min = (time_sec / 60) % 60;
    tm->tm_sec = time_sec % 60;

    return 1;

}

int OPENSSL_gmtime_diff(int *pday, int *psec,
                        const struct tm *from, const struct tm *to)
{
    int from_sec, to_sec, diff_sec;
    long from_jd, to_jd, diff_day;
    if (!julian_adj(from, 0, 0, &from_jd, &from_sec))
        return 0;
    if (!julian_adj(to, 0, 0, &to_jd, &to_sec))
        return 0;
    diff_day = to_jd - from_jd;
    diff_sec = to_sec - from_sec;
    /* Adjust differences so both positive or both negative */
    if (diff_day > 0 && diff_sec < 0) {
        diff_day--;
        diff_sec += SECS_PER_DAY;
    }
    if (diff_day < 0 && diff_sec > 0) {
        diff_day++;
        diff_sec -= SECS_PER_DAY;
    }

    if (pday)
        *pday = (int)diff_day;
    if (psec)
        *psec = diff_sec;

    return 1;

}

/* Convert tm structure and offset into julian day and seconds */
static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
                      long *pday, int *psec)
{
    int offset_hms, offset_day;
    long time_jd;
    int time_year, time_month, time_day;
    /* split offset into days and day seconds */
    offset_day = offset_sec / SECS_PER_DAY;
    /* Avoid sign issues with % operator */
    offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
    offset_day += off_day;
    /* Add current time seconds to offset */
    offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
    /* Adjust day seconds if overflow */
    if (offset_hms >= SECS_PER_DAY) {
        offset_day++;
        offset_hms -= SECS_PER_DAY;
    } else if (offset_hms < 0) {
        offset_day--;
        offset_hms += SECS_PER_DAY;
    }

    /*
     * Convert date of time structure into a Julian day number.
     */

    time_year = tm->tm_year + 1900;
    time_month = tm->tm_mon + 1;
    time_day = tm->tm_mday;

    time_jd = date_to_julian(time_year, time_month, time_day);

    /* Work out Julian day of new date */
    time_jd += offset_day;

    if (time_jd < 0)
        return 0;

    *pday = time_jd;
    *psec = offset_hms;
    return 1;
}

/*
 * Convert date to and from julian day Uses Fliegel & Van Flandern algorithm
 */
static long date_to_julian(int y, int m, int d)
{
    return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
        (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
        (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075;
}

static void julian_to_date(long jd, int *y, int *m, int *d)
{
    long L = jd + 68569;
    long n = (4 * L) / 146097;
    long i, j;

    L = L - (146097 * n + 3) / 4;
    i = (4000 * (L + 1)) / 1461001;
    L = L - (1461 * i) / 4 + 31;
    j = (80 * L) / 2447;
    *d = L - (2447 * j) / 80;
    L = j / 11;
    *m = j + 2 - (12 * L);
    *y = 100 * (n - 49) + i + L;
}

#ifdef OPENSSL_TIME_TEST

# include <stdio.h>

/*
 * Time checking test code. Check times are identical for a wide range of
 * offsets. This should be run on a machine with 64 bit time_t or it will
 * trigger the very errors the routines fix.
 */

int main(int argc, char **argv)
{
    long offset;
    for (offset = 0; offset < 1000000; offset++) {
        check_time(offset);
        check_time(-offset);
        check_time(offset * 1000);
        check_time(-offset * 1000);
    }
}

int check_time(long offset)
{
    struct tm tm1, tm2, o1;
    int off_day, off_sec;
    long toffset;
    time_t t1, t2;
    time(&t1);
    t2 = t1 + offset;
    OPENSSL_gmtime(&t2, &tm2);
    OPENSSL_gmtime(&t1, &tm1);
    o1 = tm1;
    OPENSSL_gmtime_adj(&tm1, 0, offset);
    if ((tm1.tm_year != tm2.tm_year) ||
        (tm1.tm_mon != tm2.tm_mon) ||
        (tm1.tm_mday != tm2.tm_mday) ||
        (tm1.tm_hour != tm2.tm_hour) ||
        (tm1.tm_min != tm2.tm_min) || (tm1.tm_sec != tm2.tm_sec)) {
        fprintf(stderr, "TIME ERROR!!\n");
        fprintf(stderr, "Time1: %d/%d/%d, %d:%02d:%02d\n",
                tm2.tm_mday, tm2.tm_mon + 1, tm2.tm_year + 1900,
                tm2.tm_hour, tm2.tm_min, tm2.tm_sec);
        fprintf(stderr, "Time2: %d/%d/%d, %d:%02d:%02d\n",
                tm1.tm_mday, tm1.tm_mon + 1, tm1.tm_year + 1900,
                tm1.tm_hour, tm1.tm_min, tm1.tm_sec);
        return 0;
    }
    OPENSSL_gmtime_diff(&o1, &tm1, &off_day, &off_sec);
    toffset = (long)off_day *SECS_PER_DAY + off_sec;
    if (offset != toffset) {
        fprintf(stderr, "TIME OFFSET ERROR!!\n");
        fprintf(stderr, "Expected %ld, Got %ld (%d:%d)\n",
                offset, toffset, off_day, off_sec);
        return 0;
    }
    return 1;
}

#endif
Commit	Line	Data
b8e35bd6	1	/* crypto/o_time.c -- mode:C; c-file-style: "eay" -- */
0f113f3e MC	2	/*
	3	* Written by Richard Levitte (richard@levitte.org) for the OpenSSL project
	4	* 2001.
b8e35bd6	5	*/
0f113f3e MC	6	/*
	7	* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
	8	* 2008.
87d3a0cd	9	*/
b8e35bd6 RL	10	/* ====================================================================
	11	* Copyright (c) 2001 The OpenSSL Project. All rights reserved.
	12	*
	13	* Redistribution and use in source and binary forms, with or without
	14	* modification, are permitted provided that the following conditions
	15	* are met:
	16	*
	17	* 1. Redistributions of source code must retain the above copyright
0f113f3e	18	* notice, this list of conditions and the following disclaimer.
b8e35bd6 RL	19	*
	20	* 2. Redistributions in binary form must reproduce the above copyright
	21	* notice, this list of conditions and the following disclaimer in
	22	* the documentation and/or other materials provided with the
	23	* distribution.
	24	*
	25	* 3. All advertising materials mentioning features or use of this
	26	* software must display the following acknowledgment:
	27	* "This product includes software developed by the OpenSSL Project
	28	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	29	*
	30	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	31	* endorse or promote products derived from this software without
	32	* prior written permission. For written permission, please contact
	33	* licensing@OpenSSL.org.
	34	*
	35	* 5. Products derived from this software may not be called "OpenSSL"
	36	* nor may "OpenSSL" appear in their names without prior written
	37	* permission of the OpenSSL Project.
	38	*
	39	* 6. Redistributions of any form whatsoever must retain the following
	40	* acknowledgment:
	41	* "This product includes software developed by the OpenSSL Project
	42	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	43	*
	44	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	45	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	46	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	47	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	48	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	49	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	50	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	51	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	52	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	53	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	54	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	55	* OF THE POSSIBILITY OF SUCH DAMAGE.
	56	* ====================================================================
	57	*
	58	* This product includes cryptographic software written by Eric Young
	59	* (eay@cryptsoft.com). This product includes software written by Tim
	60	* Hudson (tjh@cryptsoft.com).
	61	*
	62	*/
	63
	64	#include <openssl/e_os2.h>
5cd6571f	65	#include <string.h>
e52a3c3d	66	#include <openssl/crypto.h>
b8e35bd6 RL	67
b8e35bd6 RL	68	#ifdef OPENSSL_SYS_VMS
537c9823 RL	69	# if __CRTL_VER >= 70000000 && \
	70	(defined _POSIX_C_SOURCE \|\| !defined _ANSI_C_SOURCE)
	71	# define VMS_GMTIME_OK
	72	# endif
	73	# ifndef VMS_GMTIME_OK
	74	# include <libdtdef.h>
	75	# include <lib$routines.h>
	76	# include <lnmdef.h>
	77	# include <starlet.h>
	78	# include <descrip.h>
	79	# include <stdlib.h>
0f113f3e	80	# endif /* ndef VMS_GMTIME_OK */
b8e35bd6 RL	81	#endif
	82
	83	struct tm OPENSSL_gmtime(const time_t timer, struct tm *result)
0f113f3e MC	84	{
0f113f3e MC	85	struct tm *ts = NULL;
b8e35bd6	86
f2319414	87	#if defined(OPENSSL_THREADS) && !defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_SYS_OS2) && (!defined(OPENSSL_SYS_VMS) \|\| defined(gmtime_r)) && !defined(OPENSSL_SYS_MACOSX)
0f113f3e MC	88	/*
	89	* should return &data, but doesn't on some systems, so we don't even
	90	* look at the return value
	91	*/
	92	gmtime_r(timer, result);
	93	ts = result;
537c9823	94	#elif !defined(OPENSSL_SYS_VMS) \|\| defined(VMS_GMTIME_OK)
0f113f3e MC	95	ts = gmtime(timer);
	96	if (ts == NULL)
	97	return NULL;
52c4c51f	98
0f113f3e MC	99	memcpy(result, ts, sizeof(struct tm));
0f113f3e MC	100	ts = result;
b8e35bd6	101	#endif
537c9823	102	#if defined( OPENSSL_SYS_VMS) && !defined( VMS_GMTIME_OK)
0f113f3e MC	103	if (ts == NULL) {
	104	static $DESCRIPTOR(tabnam, "LNM$DCL_LOGICAL");
	105	static $DESCRIPTOR(lognam, "SYS$TIMEZONE_DIFFERENTIAL");
	106	char logvalue[256];
	107	unsigned int reslen = 0;
	108	struct {
	109	short buflen;
	110	short code;
	111	void *bufaddr;
	112	unsigned int *reslen;
	113	} itemlist[] = {
	114	{
	115	0, LNM$_STRING, 0, 0
	116	},
	117	{
	118	0, 0, 0, 0
	119	},
	120	};
	121	int status;
	122	time_t t;
	123
	124	/* Get the value for SYS$TIMEZONE_DIFFERENTIAL */
	125	itemlist[0].buflen = sizeof(logvalue);
	126	itemlist[0].bufaddr = logvalue;
	127	itemlist[0].reslen = &reslen;
	128	status = sys$trnlnm(0, &tabnam, &lognam, 0, itemlist);
	129	if (!(status & 1))
	130	return NULL;
	131	logvalue[reslen] = '\0';
	132
	133	t = *timer;
334ef049 RL	134
334ef049 RL	135	/* The following is extracted from the DEC C header time.h */
0f113f3e MC	136	/*
	137	** Beginning in OpenVMS Version 7.0 mktime, time, ctime, strftime
	138	** have two implementations. One implementation is provided
	139	** for compatibility and deals with time in terms of local time,
	140	** the other __utc_* deals with time in terms of UTC.
	141	*/
	142	/*
	143	* We use the same conditions as in said time.h to check if we should
	144	* assume that t contains local time (and should therefore be
	145	* adjusted) or UTC (and should therefore be left untouched).
	146	*/
	147	# if __CRTL_VER < 70000000 \|\| defined _VMS_V6_SOURCE
	148	/* Get the numerical value of the equivalence string */
	149	status = atoi(logvalue);
	150
	151	/* and use it to move time to GMT */
	152	t -= status;
	153	# endif
b8e35bd6	154
0f113f3e MC	155	/* then convert the result to the time structure */
	156
	157	/*
	158	* Since there was no gmtime_r() to do this stuff for us, we have to
	159	* do it the hard way.
	160	*/
	161	{
	162	/*-
	163	* The VMS epoch is the astronomical Smithsonian date,
	164	if I remember correctly, which is November 17, 1858.
	165	Furthermore, time is measure in thenths of microseconds
	166	and stored in quadwords (64 bit integers). unix_epoch
	167	below is January 1st 1970 expressed as a VMS time. The
	168	following code was used to get this number:
	169
	170	#include <stdio.h>
	171	#include <stdlib.h>
	172	#include <lib$routines.h>
	173	#include <starlet.h>
	174
	175	main()
	176	{
	177	unsigned long systime[2];
	178	unsigned short epoch_values[7] =
	179	{ 1970, 1, 1, 0, 0, 0, 0 };
	180
	181	lib$cvt_vectim(epoch_values, systime);
	182
	183	printf("%u %u", systime[0], systime[1]);
	184	}
	185	*/
	186	unsigned long unix_epoch[2] = { 1273708544, 8164711 };
	187	unsigned long deltatime[2];
	188	unsigned long systime[2];
	189	struct vms_vectime {
	190	short year, month, day, hour, minute, second, centi_second;
	191	} time_values;
	192	long operation;
	193
	194	/*
	195	* Turn the number of seconds since January 1st 1970 to an
	196	* internal delta time. Note that lib$cvt_to_internal_time() will
	197	* assume that t is signed, and will therefore break on 32-bit
	198	* systems some time in 2038.
	199	*/
	200	operation = LIB$K_DELTA_SECONDS;
	201	status = lib$cvt_to_internal_time(&operation, &t, deltatime);
	202
	203	/*
	204	* Add the delta time with the Unix epoch and we have the current
	205	* UTC time in internal format
	206	*/
	207	status = lib$add_times(unix_epoch, deltatime, systime);
	208
	209	/* Turn the internal time into a time vector */
	210	status = sys$numtim(&time_values, systime);
	211
	212	/* Fill in the struct tm with the result */
	213	result->tm_sec = time_values.second;
	214	result->tm_min = time_values.minute;
	215	result->tm_hour = time_values.hour;
	216	result->tm_mday = time_values.day;
	217	result->tm_mon = time_values.month - 1;
	218	result->tm_year = time_values.year - 1900;
219
220	operation = LIB$K_DAY_OF_WEEK;
221	status = lib$cvt_from_internal_time(&operation,
222	&result->tm_wday, systime);
223	result->tm_wday %= 7;
224
225	operation = LIB$K_DAY_OF_YEAR;
226	status = lib$cvt_from_internal_time(&operation,
227	&result->tm_yday, systime);
228	result->tm_yday--;
229
230	result->tm_isdst = 0; /* There's no way to know... */
231
232	ts = result;
233	}
234	}
b8e35bd6	235	#endif
0f113f3e MC	236	return ts;
0f113f3e MC	237	}
87d3a0cd	238
0f113f3e MC	239	/*
0f113f3e MC	240	* Take a tm structure and add an offset to it. This avoids any OS issues
87d3a0cd DSH	241	* with restricted date types and overflows which cause the year 2038
	242	* problem.
	243	*/
	244
	245	#define SECS_PER_DAY (24 * 60 * 60)
	246
	247	static long date_to_julian(int y, int m, int d);
	248	static void julian_to_date(long jd, int y, int m, int *d);
46a6cec6	249	static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
0f113f3e	250	long pday, int psec);
87d3a0cd DSH	251
87d3a0cd DSH	252	int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
0f113f3e MC	253	{
	254	int time_sec, time_year, time_month, time_day;
	255	long time_jd;
	256
	257	/* Convert time and offset into julian day and seconds */
	258	if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec))
	259	return 0;
1bf508c9	260
0f113f3e	261	/* Convert Julian day back to date */
1bf508c9	262
0f113f3e	263	julian_to_date(time_jd, &time_year, &time_month, &time_day);
1bf508c9	264
0f113f3e MC	265	if (time_year < 1900 \|\| time_year > 9999)
0f113f3e MC	266	return 0;
1bf508c9	267
0f113f3e	268	/* Update tm structure */
1bf508c9	269
0f113f3e MC	270	tm->tm_year = time_year - 1900;
	271	tm->tm_mon = time_month - 1;
	272	tm->tm_mday = time_day;
1bf508c9	273
0f113f3e MC	274	tm->tm_hour = time_sec / 3600;
	275	tm->tm_min = (time_sec / 60) % 60;
	276	tm->tm_sec = time_sec % 60;
1bf508c9	277
0f113f3e	278	return 1;
1bf508c9	279
1bf508c9 DSH	280	}
1bf508c9 DSH	281
46a6cec6	282	int OPENSSL_gmtime_diff(int pday, int psec,
0f113f3e MC	283	const struct tm from, const struct tm to)
	284	{
	285	int from_sec, to_sec, diff_sec;
	286	long from_jd, to_jd, diff_day;
	287	if (!julian_adj(from, 0, 0, &from_jd, &from_sec))
	288	return 0;
	289	if (!julian_adj(to, 0, 0, &to_jd, &to_sec))
	290	return 0;
	291	diff_day = to_jd - from_jd;
	292	diff_sec = to_sec - from_sec;
	293	/* Adjust differences so both positive or both negative */
	294	if (diff_day > 0 && diff_sec < 0) {
	295	diff_day--;
	296	diff_sec += SECS_PER_DAY;
	297	}
	298	if (diff_day < 0 && diff_sec > 0) {
	299	diff_day++;
	300	diff_sec -= SECS_PER_DAY;
	301	}
	302
	303	if (pday)
	304	*pday = (int)diff_day;
	305	if (psec)
	306	*psec = diff_sec;
	307
	308	return 1;
	309
	310	}
	311
1bf508c9	312	/* Convert tm structure and offset into julian day and seconds */
46a6cec6	313	static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
0f113f3e MC	314	long pday, int psec)
	315	{
	316	int offset_hms, offset_day;
	317	long time_jd;
	318	int time_year, time_month, time_day;
	319	/* split offset into days and day seconds */
	320	offset_day = offset_sec / SECS_PER_DAY;
	321	/* Avoid sign issues with % operator */
	322	offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
	323	offset_day += off_day;
	324	/* Add current time seconds to offset */
	325	offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
	326	/* Adjust day seconds if overflow */
	327	if (offset_hms >= SECS_PER_DAY) {
	328	offset_day++;
	329	offset_hms -= SECS_PER_DAY;
	330	} else if (offset_hms < 0) {
	331	offset_day--;
	332	offset_hms += SECS_PER_DAY;
	333	}
	334
	335	/*
	336	* Convert date of time structure into a Julian day number.
	337	*/
	338
	339	time_year = tm->tm_year + 1900;
	340	time_month = tm->tm_mon + 1;
	341	time_day = tm->tm_mday;
	342
	343	time_jd = date_to_julian(time_year, time_month, time_day);
	344
	345	/* Work out Julian day of new date */
	346	time_jd += offset_day;
	347
	348	if (time_jd < 0)
	349	return 0;
	350
	351	*pday = time_jd;
	352	*psec = offset_hms;
	353	return 1;
	354	}
	355
	356	/*
	357	* Convert date to and from julian day Uses Fliegel & Van Flandern algorithm
87d3a0cd DSH	358	*/
	359	static long date_to_julian(int y, int m, int d)
	360	{
0f113f3e MC	361	return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
	362	(367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
	363	(3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075;
87d3a0cd DSH	364	}
	365
	366	static void julian_to_date(long jd, int y, int m, int *d)
0f113f3e MC	367	{
	368	long L = jd + 68569;
	369	long n = (4 * L) / 146097;
	370	long i, j;
	371
	372	L = L - (146097 * n + 3) / 4;
	373	i = (4000 * (L + 1)) / 1461001;
	374	L = L - (1461 * i) / 4 + 31;
	375	j = (80 * L) / 2447;
	376	d = L - (2447 j) / 80;
	377	L = j / 11;
	378	m = j + 2 - (12 L);
	379	y = 100 (n - 49) + i + L;
	380	}
87d3a0cd DSH	381
	382	#ifdef OPENSSL_TIME_TEST
	383
0f113f3e	384	# include <stdio.h>
87d3a0cd	385
0f113f3e MC	386	/*
0f113f3e MC	387	* Time checking test code. Check times are identical for a wide range of
87d3a0cd DSH	388	* offsets. This should be run on a machine with 64 bit time_t or it will
	389	* trigger the very errors the routines fix.
	390	*/
	391
	392	int main(int argc, char **argv)
0f113f3e MC	393	{
	394	long offset;
	395	for (offset = 0; offset < 1000000; offset++) {
	396	check_time(offset);
	397	check_time(-offset);
	398	check_time(offset * 1000);
	399	check_time(-offset * 1000);
	400	}
	401	}
87d3a0cd DSH	402
87d3a0cd DSH	403	int check_time(long offset)
0f113f3e MC	404	{
	405	struct tm tm1, tm2, o1;
	406	int off_day, off_sec;
	407	long toffset;
	408	time_t t1, t2;
	409	time(&t1);
	410	t2 = t1 + offset;
	411	OPENSSL_gmtime(&t2, &tm2);
	412	OPENSSL_gmtime(&t1, &tm1);
	413	o1 = tm1;
	414	OPENSSL_gmtime_adj(&tm1, 0, offset);
	415	if ((tm1.tm_year != tm2.tm_year) \|\|
	416	(tm1.tm_mon != tm2.tm_mon) \|\|
	417	(tm1.tm_mday != tm2.tm_mday) \|\|
	418	(tm1.tm_hour != tm2.tm_hour) \|\|
	419	(tm1.tm_min != tm2.tm_min) \|\| (tm1.tm_sec != tm2.tm_sec)) {
	420	fprintf(stderr, "TIME ERROR!!\n");
	421	fprintf(stderr, "Time1: %d/%d/%d, %d:%02d:%02d\n",
	422	tm2.tm_mday, tm2.tm_mon + 1, tm2.tm_year + 1900,
	423	tm2.tm_hour, tm2.tm_min, tm2.tm_sec);
	424	fprintf(stderr, "Time2: %d/%d/%d, %d:%02d:%02d\n",
	425	tm1.tm_mday, tm1.tm_mon + 1, tm1.tm_year + 1900,
	426	tm1.tm_hour, tm1.tm_min, tm1.tm_sec);
	427	return 0;
	428	}
	429	OPENSSL_gmtime_diff(&o1, &tm1, &off_day, &off_sec);
	430	toffset = (long)off_day *SECS_PER_DAY + off_sec;
	431	if (offset != toffset) {
	432	fprintf(stderr, "TIME OFFSET ERROR!!\n");
	433	fprintf(stderr, "Expected %ld, Got %ld (%d:%d)\n",
	434	offset, toffset, off_day, off_sec);
	435	return 0;
	436	}
	437	return 1;
	438	}
87d3a0cd DSH	439
87d3a0cd DSH	440	#endif