1 files changed, 106 insertions, 0 deletions
diff --git a/tests/time/src.c b/tests/time/src.c
new file mode 100644
index 00000000..df9ad264
--- /dev/null
+++ b/tests/time/src.c
@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+
+int main() {
+  time_t xmas2002 = 1040786563ll;
+  struct tm* tm_ptr;
+
+  // Make sure stime() always fails.
+  printf("stime: %d\n", stime(&xmas2002));
+
+  // Verify that tzname sets *something*.
+  tzset();
+  printf("tzname[0] set: %d\n", strlen(tzname[0]) >= 3);
+  printf("tzname[1] set: %d\n", strlen(tzname[1]) >= 3);
+  
+  // Verify gmtime() creates correct struct.
+  tm_ptr = gmtime(&xmas2002);
+  printf("sec: %d\n", tm_ptr->tm_sec);
+  printf("min: %d\n", tm_ptr->tm_min);
+  printf("hour: %d\n", tm_ptr->tm_hour);
+  printf("day: %d\n", tm_ptr->tm_mday);
+  printf("mon: %d\n", tm_ptr->tm_mon);
+  printf("year: %d\n", tm_ptr->tm_year);
+  printf("wday: %d\n", tm_ptr->tm_wday);
+  printf("yday: %d\n", tm_ptr->tm_yday);
+  printf("dst: %d\n", tm_ptr->tm_isdst);
+  printf("off: %d\n", tm_ptr->tm_gmtoff);
+  printf("zone: %s\n", tm_ptr->tm_zone);
+  
+  // Verify timegm() reverses gmtime.
+  printf("timegm <-> gmtime: %d\n", timegm(tm_ptr) == xmas2002);
+  
+  // Verify gmtime_r() doesn't clobber static data.
+  time_t t1 = 0;
+  struct tm tm1;
+  gmtime_r(&t1, &tm1);
+  printf("old year: %d\n", tm_ptr->tm_year);
+  printf("new year: %d\n", tm1.tm_year);
+  gmtime(&xmas2002);
+  printf("old year again: %d\n", tm_ptr->tm_year);
+  
+  // Verify localtime() picks up timezone data.
+  time_t t2 = xmas2002 - 60 * 60 * 24 * 30 * 6;
+  tm_ptr = localtime(&t2);
+  printf("localtime timezone: %d\n", (timezone + tm_ptr->tm_isdst * 60 * 60 ==
+                                      -tm_ptr->tm_gmtoff));
+  printf("localtime daylight: %d\n", daylight == tm_ptr->tm_isdst);
+  printf("localtime tzname: %d\n", (!strcmp(tzname[0], tm_ptr->tm_zone) ||
+                                    !strcmp(tzname[1], tm_ptr->tm_zone)));
+
+  // Verify localtime() and mktime() reverse each other.
+  printf("localtime <-> mktime: %d\n", mktime(localtime(&xmas2002)) == xmas2002);
+  
+  // Verify localtime_r() doesn't clobber static data.
+  time_t t3 = 0;
+  struct tm tm2;
+  localtime_r(&t3, &tm2);
+  printf("old year: %d\n", tm_ptr->tm_year);
+  printf("new year: %d\n", tm2.tm_year);
+  localtime(&xmas2002);
+  printf("old year again: %d\n", tm_ptr->tm_year);
+
+  // Verify time() returns reasonable value (between 2011 and 2030).
+  time_t t4 = 0;
+  time(&t4);
+  printf("time: %d\n", t4 > 1309635200ll && t4 < 1893362400ll);
+
+  // Verify difftime() calculates accurate time difference.
+  time_t t5 = 1309635200ll;
+  printf("difftime+: %lf\n", difftime(t5, xmas2002));
+  printf("difftime-: %lf\n", difftime(xmas2002, t5));
+
+  // Verify dysize() knows its leap years.
+  printf("1854 days: %d\n", dysize(1854));
+  printf("2000 days: %d\n", dysize(2000));
+  printf("2001 days: %d\n", dysize(2001));
+  printf("2004 days: %d\n", dysize(2004));
+
+  // Verify asctime() formatting().
+  printf("asctime: %s", asctime(localtime(&xmas2002)));
+
+  // Verify asctime_r() doesn't clobber static data.
+  time_t t6 = 1309635200ll;
+  tm_ptr = localtime(&xmas2002);
+  char* formatted = asctime(tm_ptr);
+  char buffer[32];
+  asctime_r(localtime(&t6), buffer);
+  printf("old asctime: %s", formatted);
+  printf("new asctime_r: %s", buffer);
+  asctime_r(tm_ptr, buffer);
+  printf("old asctime again: %s", formatted);
+
+  // Verify that clock() is initially 0 and doesn't crash.
+  printf("clock: %d\n", clock());
+
+  // Verify that ctime_r(x, buf) is equivalent to asctime_r(localtime(x), buf2).
+  time_t t7 = time(0);
+  char buffer2[30];
+  char buffer3[30];
+  printf("ctime: %d\n", strcmp(ctime_r(&t7, buffer2),
+                               asctime_r(localtime(&t7), buffer3)));
+
+  return 0;
+}