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Test extreme tm member values

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This commit is contained in:
Peter Limkilde Svendsen
2020-09-16 23:48:41 +02:00
parent aef1be7c1b
commit 00642dd940
2 changed files with 33 additions and 6 deletions
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tests/expected/time/asctime.stdout
+5
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@@ -0,0 +1,5 @@
Thu Jan 1 00:00:00 1970
Sun Jan 1 00:00:00 1000
Sat Dec 31 23:59:60 9999
Sun Jan-99 00:00:00 -999
Sat Dec999 99:99:99 9999
tests/time/asctime.c
+28 -6
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@@ -6,12 +6,34 @@
#include "test_helpers.h"
int main(void) {
time_t a = 0;
struct tm *time_info = gmtime(&a);
time_t unix_epoch = 0;
struct tm *unix_epoch_tm_ptr = gmtime(&unix_epoch);
char *time_string = asctime(time_info);
char *time_string = NULL;
if (time_string == NULL || strcmp(time_string, "Thu Jan 1 00:00:00 1970\n") != 0) {
exit(EXIT_FAILURE);
}
/* Min/max non-UB-causing values according to ISO C11 and newer. */
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};
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};
/* Min/max non-UB-causing values according to POSIX (issue 7). These
* will cause UB according to the ISO standard! */
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};
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};
time_string = asctime(unix_epoch_tm_ptr);
printf("%s", time_string);
time_string = asctime(&iso_c_min_tm);
printf("%s", time_string);
time_string = asctime(&iso_c_max_tm);
printf("%s", time_string);
time_string = asctime(&posix_min_tm);
printf("%s", time_string);
time_string = asctime(&posix_max_tm);
printf("%s", time_string);
return 0;
}