/* crypto/o_time.c -*- mode:C; c-file-style: "eay" -*- */
/*
 * Written by Richard Levitte (richard@levitte.org) for the OpenSSL project
 * 2001.
 */
/* ====================================================================
 * 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
# include <libdtdef.h>
# include <lib$routines.h>
# include <lnmdef.h>
# include <starlet.h>
# include <descrip.h>
# include <stdlib.h>
#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(__CYGWIN32__) && (!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)
    ts = gmtime(timer);
    if (ts == NULL)
        return NULL;

    memcpy(result, ts, sizeof(struct tm));
    ts = result;
#endif
#ifdef OPENSSL_SYS_VMS
    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;
}