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Member "file-5.35/src/cdf_time.c" (11 Sep 2018, 4470 Bytes) of package /linux/misc/file-5.35.tar.gz:


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    1 /*-
    2  * Copyright (c) 2008 Christos Zoulas
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   15  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   16  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   18  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   19  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   20  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   21  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   22  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   23  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   24  * POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include "file.h"
   28 
   29 #ifndef lint
   30 FILE_RCSID("@(#)$File: cdf_time.c,v 1.17 2018/09/09 20:33:28 christos Exp $")
   31 #endif
   32 
   33 #include <time.h>
   34 #ifdef TEST
   35 #include <err.h>
   36 #endif
   37 #include <string.h>
   38 
   39 #include "cdf.h"
   40 
   41 #define isleap(y) ((((y) % 4) == 0) && \
   42     ((((y) % 100) != 0) || (((y) % 400) == 0)))
   43 
   44 static const int mdays[] = {
   45     31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
   46 };
   47 
   48 /*
   49  * Return the number of days between jan 01 1601 and jan 01 of year.
   50  */
   51 static int
   52 cdf_getdays(int year)
   53 {
   54     int days = 0;
   55     int y;
   56 
   57     for (y = CDF_BASE_YEAR; y < year; y++)
   58         days += isleap(y) + 365;
   59 
   60     return days;
   61 }
   62 
   63 /*
   64  * Return the day within the month
   65  */
   66 static int
   67 cdf_getday(int year, int days)
   68 {
   69     size_t m;
   70 
   71     for (m = 0; m < sizeof(mdays) / sizeof(mdays[0]); m++) {
   72         int sub = mdays[m] + (m == 1 && isleap(year));
   73         if (days < sub)
   74             return days;
   75         days -= sub;
   76     }
   77     return days;
   78 }
   79 
   80 /*
   81  * Return the 0...11 month number.
   82  */
   83 static int
   84 cdf_getmonth(int year, int days)
   85 {
   86     size_t m;
   87 
   88     for (m = 0; m < sizeof(mdays) / sizeof(mdays[0]); m++) {
   89         days -= mdays[m];
   90         if (m == 1 && isleap(year))
   91             days--;
   92         if (days <= 0)
   93             return (int)m;
   94     }
   95     return (int)m;
   96 }
   97 
   98 int
   99 cdf_timestamp_to_timespec(struct timespec *ts, cdf_timestamp_t t)
  100 {
  101     struct tm tm;
  102 #ifdef HAVE_STRUCT_TM_TM_ZONE
  103     static char UTC[] = "UTC";
  104 #endif
  105     int rdays;
  106 
  107     /* Unit is 100's of nanoseconds */
  108     ts->tv_nsec = (t % CDF_TIME_PREC) * 100;
  109 
  110     t /= CDF_TIME_PREC;
  111     tm.tm_sec = (int)(t % 60);
  112     t /= 60;
  113 
  114     tm.tm_min = (int)(t % 60);
  115     t /= 60;
  116 
  117     tm.tm_hour = (int)(t % 24);
  118     t /= 24;
  119 
  120     /* XXX: Approx */
  121     tm.tm_year = (int)(CDF_BASE_YEAR + (t / 365));
  122 
  123     rdays = cdf_getdays(tm.tm_year);
  124     t -= rdays - 1;
  125     tm.tm_mday = cdf_getday(tm.tm_year, (int)t);
  126     tm.tm_mon = cdf_getmonth(tm.tm_year, (int)t);
  127     tm.tm_wday = 0;
  128     tm.tm_yday = 0;
  129     tm.tm_isdst = 0;
  130 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
  131     tm.tm_gmtoff = 0;
  132 #endif
  133 #ifdef HAVE_STRUCT_TM_TM_ZONE
  134     tm.tm_zone = UTC;
  135 #endif
  136     tm.tm_year -= 1900;
  137     ts->tv_sec = mktime(&tm);
  138     if (ts->tv_sec == -1) {
  139         errno = EINVAL;
  140         return -1;
  141     }
  142     return 0;
  143 }
  144 
  145 int
  146 /*ARGSUSED*/
  147 cdf_timespec_to_timestamp(cdf_timestamp_t *t, const struct timespec *ts)
  148 {
  149 #ifndef __lint__
  150     (void)&t;
  151     (void)&ts;
  152 #endif
  153 #ifdef notyet
  154     struct tm tm;
  155     if (gmtime_r(&ts->ts_sec, &tm) == NULL) {
  156         errno = EINVAL;
  157         return -1;
  158     }
  159     *t = (ts->ts_nsec / 100) * CDF_TIME_PREC;
  160     *t = tm.tm_sec;
  161     *t += tm.tm_min * 60;
  162     *t += tm.tm_hour * 60 * 60;
  163     *t += tm.tm_mday * 60 * 60 * 24;
  164 #endif
  165     return 0;
  166 }
  167 
  168 char *
  169 cdf_ctime(const time_t *sec, char *buf)
  170 {
  171     char *ptr = ctime_r(sec, buf);
  172     if (ptr != NULL)
  173         return buf;
  174     (void)snprintf(buf, 26, "*Bad* %#16.16" INT64_T_FORMAT "x\n",
  175         (long long)*sec);
  176     return buf;
  177 }
  178 
  179 
  180 #ifdef TEST_TIME
  181 int
  182 main(int argc, char *argv[])
  183 {
  184     struct timespec ts;
  185     char buf[25];
  186     static const cdf_timestamp_t tst = 0x01A5E403C2D59C00ULL;
  187     static const char *ref = "Sat Apr 23 01:30:00 1977";
  188     char *p, *q;
  189 
  190     cdf_timestamp_to_timespec(&ts, tst);
  191     p = cdf_ctime(&ts.tv_sec, buf);
  192     if ((q = strchr(p, '\n')) != NULL)
  193         *q = '\0';
  194     if (strcmp(ref, p) != 0)
  195         errx(1, "Error date %s != %s\n", ref, p);
  196     return 0;
  197 }
  198 #endif