tests/xtimegm.c

   1 // Copyright © Tavian Barnes <tavianator@tavianator.com>
   2 // SPDX-License-Identifier: 0BSD
   3
   4 #include "../src/xtime.h"
   5 #include "../src/config.h"
   6 #include <stdint.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <time.h>
  10
  11 static bool tm_equal(const struct tm *tma, const struct tm *tmb) {
  12         if (tma->tm_year != tmb->tm_year) {
  13                 return false;
  14         }
  15         if (tma->tm_mon != tmb->tm_mon) {
  16                 return false;
  17         }
  18         if (tma->tm_mday != tmb->tm_mday) {
  19                 return false;
  20         }
  21         if (tma->tm_hour != tmb->tm_hour) {
  22                 return false;
  23         }
  24         if (tma->tm_min != tmb->tm_min) {
  25                 return false;
  26         }
  27         if (tma->tm_sec != tmb->tm_sec) {
  28                 return false;
  29         }
  30         if (tma->tm_wday != tmb->tm_wday) {
  31                 return false;
  32         }
  33         if (tma->tm_yday != tmb->tm_yday) {
  34                 return false;
  35         }
  36         if (tma->tm_isdst != tmb->tm_isdst) {
  37                 return false;
  38         }
  39
  40         return true;
  41 }
  42
  43 static void tm_print(FILE *file, const struct tm *tm) {
  44         fprintf(file, "Y%d M%d D%d  h%d m%d s%d  wd%d yd%d%s\n",
  45                 tm->tm_year, tm->tm_mon, tm->tm_mday,
  46                 tm->tm_hour, tm->tm_min, tm->tm_sec,
  47                 tm->tm_wday, tm->tm_yday,
  48                 tm->tm_isdst ? (tm->tm_isdst < 0 ? " (DST?)" : " (DST)") : "");
  49 }
  50
  51 int main(void) {
  52         if (setenv("TZ", "UTC0", true) != 0) {
  53                 perror("setenv()");
  54                 return EXIT_FAILURE;
  55         }
  56
  57         struct tm tm = {
  58                 .tm_isdst = -1,
  59         };
  60
  61         for (tm.tm_year = 10; tm.tm_year <= 200; tm.tm_year += 10)
  62         for (tm.tm_mon = -3; tm.tm_mon <= 15; tm.tm_mon += 3)
  63         for (tm.tm_mday = -31; tm.tm_mday <= 61; tm.tm_mday += 4)
  64         for (tm.tm_hour = -1; tm.tm_hour <= 24; tm.tm_hour += 5)
  65         for (tm.tm_min = -1; tm.tm_min <= 60; tm.tm_min += 31)
  66         for (tm.tm_sec = -60; tm.tm_sec <= 120; tm.tm_sec += 5) {
  67                 struct tm tma = tm, tmb = tm;
  68                 time_t ta, tb;
  69                 ta = mktime(&tma);
  70                 if (xtimegm(&tmb, &tb) != 0) {
  71                         tb = -1;
  72                 }
  73
  74                 bool fail = false;
  75                 if (ta != tb) {
  76                         printf("Mismatch:  %jd != %jd\n", (intmax_t)ta, (intmax_t)tb);
  77                         fail = true;
  78                 }
  79                 if (ta != -1 && !tm_equal(&tma, &tmb)) {
  80                         printf("mktime():  ");
  81                         tm_print(stdout, &tma);
  82                         printf("xtimegm(): ");
  83                         tm_print(stdout, &tmb);
  84                         fail = true;
  85                 }
  86                 if (fail) {
  87                         printf("Input:     ");
  88                         tm_print(stdout, &tm);
  89                         return EXIT_FAILURE;
  90                 }
  91         }
  92
  93         return EXIT_SUCCESS;
  94 }