[efi-boot-shim.git] / Cryptlib / OpenSSL / crypto / o_time.c

/* crypto/o_time.c */
/*
 * 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 "o_time.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 */


/*
 * Needed to pick up the correct definitions and declarations in some of the
 * DEC C Header Files (*.H).
 */
# define __NEW_STARLET 1

# if (defined(__alpha) || defined(__ia64))
#  include <iledef.h>
# else

/* VAX */
typedef struct _ile3 {          /* Copied from ILEDEF.H for Alpha   */
#  pragma __nomember_alignment
    unsigned short int ile3$w_length;        /* Length of buffer in bytes */
    unsigned short int ile3$w_code;          /* Item code value */
    void *ile3$ps_bufaddr;                   /* Buffer address */
    unsigned short int *ile3$ps_retlen_addr; /* Address of word for returned length */
} ILE3;
# endif   /* alpha || ia64    */
#endif    /* OPENSSL_SYS_VMS  */

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) && !defined(OPENSSL_SYS_SUNOS)
    /*
     * 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;
# if __INITIAL_POINTER_SIZE == 64
        ILEB_64 itemlist[2], *pitem;
# else
        ILE3 itemlist[2], *pitem;
# endif
        int status;
        time_t t;


        /*
         * Setup an itemlist for the call to $TRNLNM - Translate Logical Name.
         */
        pitem = itemlist;

# if __INITIAL_POINTER_SIZE == 64
        pitem->ileb_64$w_mbo = 1;
        pitem->ileb_64$w_code = LNM$_STRING;
        pitem->ileb_64$l_mbmo = -1;
        pitem->ileb_64$q_length = sizeof (logvalue);
        pitem->ileb_64$pq_bufaddr = logvalue;
        pitem->ileb_64$pq_retlen_addr = (unsigned __int64 *) &reslen;
        pitem++;
        /* Last item of the item list is null terminated */
        pitem->ileb_64$q_length = pitem->ileb_64$w_code = 0;
# else
        pitem->ile3$w_length = sizeof (logvalue);
        pitem->ile3$w_code = LNM$_STRING;
        pitem->ile3$ps_bufaddr = logvalue;
        pitem->ile3$ps_retlen_addr = (unsigned short int *) &reslen;
        pitem++;
        /* Last item of the item list is null terminated */
        pitem->ile3$w_length = pitem->ile3$w_code = 0;
# endif


        /* Get the value for SYS$TIMEZONE_DIFFERENTIAL */
        status = sys$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
031e5cce	1	/* crypto/o_time.c */
d3819813	2	/*
031e5cce SM	3	* Written by Richard Levitte (richard@levitte.org) for the OpenSSL project
	4	* 2001.
	5	*/
	6	/*
	7	* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
	8	* 2008.
	9	*/
	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
	18	* notice, this list of conditions and the following disclaimer.
	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).
3e575651 SL	61	*
	62	*/
	63
	64	#include <openssl/e_os2.h>
	65	#include <string.h>
031e5cce	66	#include "o_time.h"
3e575651 SL	67
3e575651 SL	68	#ifdef OPENSSL_SYS_VMS
d3819813 MTL	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$routines.h>
	76	# include <lnmdef.h>
	77	# include <starlet.h>
	78	# include <descrip.h>
	79	# include <stdlib.h>
	80	# endif /* ndef VMS_GMTIME_OK */
f4173af1 MTL	81
	82
	83	/*
	84	* Needed to pick up the correct definitions and declarations in some of the
	85	* DEC C Header Files (*.H).
	86	*/
	87	# define __NEW_STARLET 1
	88
	89	# if (defined(__alpha) \|\| defined(__ia64))
	90	# include <iledef.h>
	91	# else
	92
	93	/* VAX */
	94	typedef struct _ile3 { /* Copied from ILEDEF.H for Alpha */
	95	# pragma __nomember_alignment
	96	unsigned short int ile3$w_length; /* Length of buffer in bytes */
	97	unsigned short int ile3$w_code; /* Item code value */
	98	void ile3$ps_bufaddr; / Buffer address */
	99	unsigned short int ile3$ps_retlen_addr; / Address of word for returned length */
	100	} ILE3;
	101	# endif /* alpha \|\| ia64 */
	102	#endif /* OPENSSL_SYS_VMS */
3e575651 SL	103
3e575651 SL	104	struct tm OPENSSL_gmtime(const time_t timer, struct tm *result)
d3819813 MTL	105	{
	106	struct tm *ts = NULL;
	107
031e5cce SM	108	#if defined(OPENSSL_THREADS) && !defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_SYS_OS2) && (!defined(OPENSSL_SYS_VMS) \|\| defined(gmtime_r)) && !defined(OPENSSL_SYS_MACOSX) && !defined(OPENSSL_SYS_SUNOS)
	109	/*
	110	* should return &data, but doesn't on some systems, so we don't even
	111	* look at the return value
	112	*/
	113	gmtime_r(timer, result);
d3819813 MTL	114	ts = result;
	115	#elif !defined(OPENSSL_SYS_VMS) \|\| defined(VMS_GMTIME_OK)
	116	ts = gmtime(timer);
	117	if (ts == NULL)
	118	return NULL;
	119
	120	memcpy(result, ts, sizeof(struct tm));
	121	ts = result;
3e575651	122	#endif
d3819813 MTL	123	#if defined( OPENSSL_SYS_VMS) && !defined( VMS_GMTIME_OK)
	124	if (ts == NULL) {
	125	static $DESCRIPTOR(tabnam, "LNM$DCL_LOGICAL");
	126	static $DESCRIPTOR(lognam, "SYS$TIMEZONE_DIFFERENTIAL");
	127	char logvalue[256];
	128	unsigned int reslen = 0;
f4173af1 MTL	129	# if __INITIAL_POINTER_SIZE == 64
	130	ILEB_64 itemlist[2], *pitem;
	131	# else
	132	ILE3 itemlist[2], *pitem;
	133	# endif
d3819813 MTL	134	int status;
	135	time_t t;
	136
f4173af1 MTL	137
	138	/*
	139	* Setup an itemlist for the call to $TRNLNM - Translate Logical Name.
	140	*/
	141	pitem = itemlist;
	142
	143	# if __INITIAL_POINTER_SIZE == 64
	144	pitem->ileb_64$w_mbo = 1;
	145	pitem->ileb_64$w_code = LNM$_STRING;
	146	pitem->ileb_64$l_mbmo = -1;
	147	pitem->ileb_64$q_length = sizeof (logvalue);
	148	pitem->ileb_64$pq_bufaddr = logvalue;
	149	pitem->ileb_64$pq_retlen_addr = (unsigned __int64 *) &reslen;
	150	pitem++;
	151	/* Last item of the item list is null terminated */
	152	pitem->ileb_64$q_length = pitem->ileb_64$w_code = 0;
	153	# else
	154	pitem->ile3$w_length = sizeof (logvalue);
	155	pitem->ile3$w_code = LNM$_STRING;
	156	pitem->ile3$ps_bufaddr = logvalue;
	157	pitem->ile3$ps_retlen_addr = (unsigned short int *) &reslen;
	158	pitem++;
	159	/* Last item of the item list is null terminated */
	160	pitem->ile3$w_length = pitem->ile3$w_code = 0;
	161	# endif
	162
	163
d3819813	164	/* Get the value for SYS$TIMEZONE_DIFFERENTIAL */
d3819813 MTL	165	status = sys$trnlnm(0, &tabnam, &lognam, 0, itemlist);
	166	if (!(status & 1))
	167	return NULL;
	168	logvalue[reslen] = '\0';
	169
	170	t = *timer;
3e575651	171
f4173af1	172	/* The following is extracted from the DEC C header time.h */
d3819813 MTL	173	/*
	174	** Beginning in OpenVMS Version 7.0 mktime, time, ctime, strftime
	175	** have two implementations. One implementation is provided
	176	** for compatibility and deals with time in terms of local time,
	177	** the other __utc_* deals with time in terms of UTC.
	178	*/
	179	/*
	180	* We use the same conditions as in said time.h to check if we should
	181	* assume that t contains local time (and should therefore be
	182	* adjusted) or UTC (and should therefore be left untouched).
	183	*/
	184	# if __CRTL_VER < 70000000 \|\| defined _VMS_V6_SOURCE
	185	/* Get the numerical value of the equivalence string */
	186	status = atoi(logvalue);
	187
	188	/* and use it to move time to GMT */
	189	t -= status;
	190	# endif
	191
	192	/* then convert the result to the time structure */
	193
	194	/*
	195	* Since there was no gmtime_r() to do this stuff for us, we have to
	196	* do it the hard way.
	197	*/
	198	{
	199	/*-
	200	* The VMS epoch is the astronomical Smithsonian date,
	201	if I remember correctly, which is November 17, 1858.
031e5cce	202	Furthermore, time is measure in thenths of microseconds
d3819813 MTL	203	and stored in quadwords (64 bit integers). unix_epoch
	204	below is January 1st 1970 expressed as a VMS time. The
	205	following code was used to get this number:
	206
	207	#include <stdio.h>
	208	#include <stdlib.h>
	209	#include <lib$routines.h>
	210	#include <starlet.h>
	211
	212	main()
	213	{
	214	unsigned long systime[2];
	215	unsigned short epoch_values[7] =
	216	{ 1970, 1, 1, 0, 0, 0, 0 };
	217
	218	lib$cvt_vectim(epoch_values, systime);
	219
	220	printf("%u %u", systime[0], systime[1]);
	221	}
	222	*/
	223	unsigned long unix_epoch[2] = { 1273708544, 8164711 };
	224	unsigned long deltatime[2];
	225	unsigned long systime[2];
	226	struct vms_vectime {
	227	short year, month, day, hour, minute, second, centi_second;
	228	} time_values;
	229	long operation;
	230
	231	/*
	232	* Turn the number of seconds since January 1st 1970 to an
	233	* internal delta time. Note that lib$cvt_to_internal_time() will
	234	* assume that t is signed, and will therefore break on 32-bit
	235	* systems some time in 2038.
	236	*/
	237	operation = LIB$K_DELTA_SECONDS;
	238	status = lib$cvt_to_internal_time(&operation, &t, deltatime);
	239
	240	/*
	241	* Add the delta time with the Unix epoch and we have the current
	242	* UTC time in internal format
	243	*/
	244	status = lib$add_times(unix_epoch, deltatime, systime);
	245
	246	/* Turn the internal time into a time vector */
	247	status = sys$numtim(&time_values, systime);
	248
	249	/* Fill in the struct tm with the result */
	250	result->tm_sec = time_values.second;
	251	result->tm_min = time_values.minute;
	252	result->tm_hour = time_values.hour;
	253	result->tm_mday = time_values.day;
	254	result->tm_mon = time_values.month - 1;
	255	result->tm_year = time_values.year - 1900;
	256
	257	operation = LIB$K_DAY_OF_WEEK;
	258	status = lib$cvt_from_internal_time(&operation,
	259	&result->tm_wday, systime);
	260	result->tm_wday %= 7;
	261
	262	operation = LIB$K_DAY_OF_YEAR;
	263	status = lib$cvt_from_internal_time(&operation,
	264	&result->tm_yday, systime);
	265	result->tm_yday--;
	266
267	result->tm_isdst = 0; /* There's no way to know... */
268
269	ts = result;
270	}
271	}
3e575651	272	#endif
d3819813 MTL	273	return ts;
	274	}
	275
	276	/*
	277	* Take a tm structure and add an offset to it. This avoids any OS issues
	278	* with restricted date types and overflows which cause the year 2038
	279	* problem.
	280	*/
	281
	282	#define SECS_PER_DAY (24 * 60 * 60)
	283
	284	static long date_to_julian(int y, int m, int d);
	285	static void julian_to_date(long jd, int y, int m, int *d);
	286	static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
	287	long pday, int psec);
	288
	289	int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
	290	{
	291	int time_sec, time_year, time_month, time_day;
	292	long time_jd;
	293
031e5cce	294	/* Convert time and offset into julian day and seconds */
d3819813 MTL	295	if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec))
	296	return 0;
	297
	298	/* Convert Julian day back to date */
	299
	300	julian_to_date(time_jd, &time_year, &time_month, &time_day);
	301
	302	if (time_year < 1900 \|\| time_year > 9999)
	303	return 0;
	304
	305	/* Update tm structure */
	306
	307	tm->tm_year = time_year - 1900;
	308	tm->tm_mon = time_month - 1;
	309	tm->tm_mday = time_day;
	310
	311	tm->tm_hour = time_sec / 3600;
	312	tm->tm_min = (time_sec / 60) % 60;
	313	tm->tm_sec = time_sec % 60;
	314
	315	return 1;
	316
	317	}
	318
	319	int OPENSSL_gmtime_diff(int pday, int psec,
	320	const struct tm from, const struct tm to)
	321	{
	322	int from_sec, to_sec, diff_sec;
	323	long from_jd, to_jd, diff_day;
	324	if (!julian_adj(from, 0, 0, &from_jd, &from_sec))
	325	return 0;
	326	if (!julian_adj(to, 0, 0, &to_jd, &to_sec))
	327	return 0;
	328	diff_day = to_jd - from_jd;
	329	diff_sec = to_sec - from_sec;
	330	/* Adjust differences so both positive or both negative */
	331	if (diff_day > 0 && diff_sec < 0) {
	332	diff_day--;
	333	diff_sec += SECS_PER_DAY;
	334	}
	335	if (diff_day < 0 && diff_sec > 0) {
	336	diff_day++;
	337	diff_sec -= SECS_PER_DAY;
	338	}
	339
	340	if (pday)
	341	*pday = (int)diff_day;
	342	if (psec)
	343	*psec = diff_sec;
	344
	345	return 1;
	346
	347	}
	348
	349	/* Convert tm structure and offset into julian day and seconds */
	350	static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
	351	long pday, int psec)
	352	{
	353	int offset_hms, offset_day;
	354	long time_jd;
	355	int time_year, time_month, time_day;
	356	/* split offset into days and day seconds */
	357	offset_day = offset_sec / SECS_PER_DAY;
	358	/* Avoid sign issues with % operator */
359	offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
360	offset_day += off_day;
361	/* Add current time seconds to offset */
362	offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
363	/* Adjust day seconds if overflow */
364	if (offset_hms >= SECS_PER_DAY) {
365	offset_day++;
366	offset_hms -= SECS_PER_DAY;
367	} else if (offset_hms < 0) {
368	offset_day--;
369	offset_hms += SECS_PER_DAY;
370	}
371
372	/*
373	* Convert date of time structure into a Julian day number.
374	*/
375
376	time_year = tm->tm_year + 1900;
377	time_month = tm->tm_mon + 1;
378	time_day = tm->tm_mday;
379
380	time_jd = date_to_julian(time_year, time_month, time_day);
381
382	/* Work out Julian day of new date */
383	time_jd += offset_day;
384
385	if (time_jd < 0)
386	return 0;
387
388	*pday = time_jd;
389	*psec = offset_hms;
390	return 1;
391	}
392
393	/*
394	* Convert date to and from julian day Uses Fliegel & Van Flandern algorithm
395	*/
396	static long date_to_julian(int y, int m, int d)
397	{
398	return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
399	(367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
400	(3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075;
401	}
402
403	static void julian_to_date(long jd, int y, int m, int *d)
404	{
405	long L = jd + 68569;
406	long n = (4 * L) / 146097;
407	long i, j;
408
409	L = L - (146097 * n + 3) / 4;
410	i = (4000 * (L + 1)) / 1461001;
411	L = L - (1461 * i) / 4 + 31;
412	j = (80 * L) / 2447;
413	d = L - (2447 j) / 80;
414	L = j / 11;
415	m = j + 2 - (12 L);
416	y = 100 (n - 49) + i + L;
417	}
031e5cce SM	418
	419	#ifdef OPENSSL_TIME_TEST
	420
	421	# include <stdio.h>
	422
	423	/*
	424	* Time checking test code. Check times are identical for a wide range of
	425	* offsets. This should be run on a machine with 64 bit time_t or it will
	426	* trigger the very errors the routines fix.
	427	*/
	428
	429	int main(int argc, char **argv)
	430	{
	431	long offset;
	432	for (offset = 0; offset < 1000000; offset++) {
	433	check_time(offset);
	434	check_time(-offset);
	435	check_time(offset * 1000);
	436	check_time(-offset * 1000);
	437	}
	438	}
	439
	440	int check_time(long offset)
	441	{
	442	struct tm tm1, tm2, o1;
	443	int off_day, off_sec;
	444	long toffset;
	445	time_t t1, t2;
	446	time(&t1);
	447	t2 = t1 + offset;
	448	OPENSSL_gmtime(&t2, &tm2);
	449	OPENSSL_gmtime(&t1, &tm1);
	450	o1 = tm1;
	451	OPENSSL_gmtime_adj(&tm1, 0, offset);
	452	if ((tm1.tm_year != tm2.tm_year) \|\|
	453	(tm1.tm_mon != tm2.tm_mon) \|\|
	454	(tm1.tm_mday != tm2.tm_mday) \|\|
	455	(tm1.tm_hour != tm2.tm_hour) \|\|
	456	(tm1.tm_min != tm2.tm_min) \|\| (tm1.tm_sec != tm2.tm_sec)) {
	457	fprintf(stderr, "TIME ERROR!!\n");
	458	fprintf(stderr, "Time1: %d/%d/%d, %d:%02d:%02d\n",
	459	tm2.tm_mday, tm2.tm_mon + 1, tm2.tm_year + 1900,
	460	tm2.tm_hour, tm2.tm_min, tm2.tm_sec);
	461	fprintf(stderr, "Time2: %d/%d/%d, %d:%02d:%02d\n",
	462	tm1.tm_mday, tm1.tm_mon + 1, tm1.tm_year + 1900,
	463	tm1.tm_hour, tm1.tm_min, tm1.tm_sec);
	464	return 0;
	465	}
	466	OPENSSL_gmtime_diff(&o1, &tm1, &off_day, &off_sec);
	467	toffset = (long)off_day *SECS_PER_DAY + off_sec;
	468	if (offset != toffset) {
	469	fprintf(stderr, "TIME OFFSET ERROR!!\n");
	470	fprintf(stderr, "Expected %ld, Got %ld (%d:%d)\n",
	471	offset, toffset, off_day, off_sec);
	472	return 0;
	473	}
	474	return 1;
	475	}
	476
	477	#endif