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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 "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(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;
      }

/* 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);

int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
      {
      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;

      /* 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 = offset_hms / 3600;
      tm->tm_min = (offset_hms / 60) % 60;
      tm->tm_sec = offset_hms % 60;

      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;
      time_t t1, t2;
      time(&t1);
      t2 = t1 + offset;
      OPENSSL_gmtime(&t2, &tm2);
      OPENSSL_gmtime(&t1, &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))
            return 1;
      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;
      }

#endif

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