Peter Limkilde Svendsen
40 lines
1.6 KiB
C
40 lines
1.6 KiB
C
#include <time.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "test_helpers.h"
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int main(void) {
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time_t unix_epoch = 0;
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struct tm *unix_epoch_tm_ptr = gmtime(&unix_epoch);
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char *time_string = NULL;
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/* Min/max non-UB-causing values according to ISO C11 and newer. */
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struct tm iso_c_min_tm = {.tm_sec = 0, .tm_min = 0, .tm_hour = 0, .tm_mday = 1, .tm_mon = 0, .tm_year = 1000-1900, .tm_wday = 0, .tm_yday = 0, .tm_isdst = 0, .tm_gmtoff = 0, .tm_zone = NULL};
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struct tm iso_c_max_tm = {.tm_sec = 60, .tm_min = 59, .tm_hour = 23, .tm_mday = 31, .tm_mon = 11, .tm_year = 9999-1900, .tm_wday = 6, .tm_yday = 0, .tm_isdst = 0, .tm_gmtoff = 0, .tm_zone = NULL};
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/* Min/max non-UB-causing values according to POSIX (issue 7). These
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* will cause UB according to the ISO standard! */
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struct tm posix_min_tm = {.tm_sec = 0, .tm_min = 0, .tm_hour = 0, .tm_mday = -99, .tm_mon = 0, .tm_year = -999-1900, .tm_wday = 0, .tm_yday = 0, .tm_isdst = 0, .tm_gmtoff = 0, .tm_zone = NULL};
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struct tm posix_max_tm = {.tm_sec = 99, .tm_min = 99, .tm_hour = 99, .tm_mday = 999, .tm_mon = 11, .tm_year = 9999-1900, .tm_wday = 6, .tm_yday = 0, .tm_isdst = 0, .tm_gmtoff = 0, .tm_zone = NULL};
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time_string = asctime(unix_epoch_tm_ptr);
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printf("%s", time_string);
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time_string = asctime(&iso_c_min_tm);
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printf("%s", time_string);
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time_string = asctime(&iso_c_max_tm);
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printf("%s", time_string);
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time_string = asctime(&posix_min_tm);
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printf("%s", time_string);
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time_string = asctime(&posix_max_tm);
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printf("%s", time_string);
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return 0;
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}
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