test_calendar.c: add tests for add_minute, substract_minute, get_utchour

Issue #3

tests/test_calendar.c

@@ -7,15 +7,79 @@
 #include <sysexits.h>
 #include <time.h>
 
+static void
+init_fwd_tm(struct tm * const time)
+{
+	time->tm_year = base_year;
+	time->tm_mon = 1;
+	time->tm_mday = 1;
+	time->tm_wday = 1;
+	time->tm_hour = 0;
+	time->tm_min = 0;
+	/* extra fields: */
+	time->tm_sec = 0;
+	time->tm_yday = 0;
+	time->tm_isdst = -1;
+	time->tm_zone = NULL;
+}
+
+static int
+test_utc(char *name, int hours)
+{
+	struct tm time, time2, time3;
+	time.tm_wday = 1;
+	time.tm_isdst = hours - 1;
+	time.tm_min = 0;
+	/* initialize to UTC */
+	init_fwd_tm(&time2);
+	for (int i = 0; i < 60 * hours; i++)
+		time2 = substract_minute(time2, false);
+
+	for (time.tm_year = base_year; time.tm_year < base_year + 400; time.tm_year++) {
+		for (time.tm_mon = 1; time.tm_mon < 13; time.tm_mon++) {
+			int lday = lastday(time);
+			for (time.tm_mday = 1; time.tm_mday <= lday; time.tm_mday++) {
+				for (time.tm_hour = 0; time.tm_hour < 24;
+				    time.tm_hour++) {
+					time3 = get_utctime(time);
+					if (time2.tm_year != time3.tm_year ||
+					    time2.tm_mon != time3.tm_mon ||
+					    time2.tm_mday != time3.tm_mday ||
+					    time2.tm_wday != time3.tm_wday ||
+					    time2.tm_hour != time3.tm_hour) {
+						printf("%s: get_utchour %i:"
+						    " %d-%d-%d,%d %d must be"
+						    " %d-%d-%d,%d %d\n", name, hours,
+						    time3.tm_year, time3.tm_mon,
+						    time3.tm_mday, time3.tm_wday,
+						    time3.tm_hour, time2.tm_year,
+						    time2.tm_mon, time2.tm_mday,
+						    time2.tm_wday, time2.tm_hour);
+						return EX_SOFTWARE;
+					}
+					for (int i = 0; i < 60; i++)
+						time2 = add_minute(time2, false);
+				}
+				if (++time.tm_wday == 8)
+					time.tm_wday = 1;
+			}
+		}
+	}
+	return EX_OK;
+}
+
 int
 main(int argc, char *argv[])
 {
-	struct tm time;
+	struct tm time, time2;
+	int i;
 
 	/* base_year is currently 1900, and 1900-01-01 is a Monday */
 	time.tm_wday = 1; /* Monday */
 
-	/* check for every date if it matches */
+	/* isleeapyear() and lastday() are OK by definition */
+
+	/* century_offset(): check for every date if it matches */
 	for (int century = 0; century < 4; century++)
 		for (time.tm_year = 0; time.tm_year < 100; time.tm_year++)
 			for (time.tm_mon = 1; time.tm_mon < 13; time.tm_mon++) {
@@ -41,5 +105,104 @@ main(int argc, char *argv[])
 						time.tm_wday = 1;
 				}
 			}
+
+	/* add_minute(): check for every minute increase if it matches */
+	init_fwd_tm(&time2);
+	time.tm_wday = 1;
+	for (time.tm_year = base_year; time.tm_year < base_year + 400; time.tm_year++) {
+		for (time.tm_mon = 1; time.tm_mon < 13; time.tm_mon++) {
+			int lday = lastday(time);
+			for (time.tm_mday = 1; time.tm_mday <= lday; time.tm_mday++) {
+				for (time.tm_hour = 0; time.tm_hour < 24;
+				    time.tm_hour++) {
+					for (time.tm_min = 0; time.tm_min < 60;
+					    time.tm_min++) {
+						if (time2.tm_year != time.tm_year ||
+						    time2.tm_mon != time.tm_mon ||
+						    time2.tm_mday != time.tm_mday ||
+						    time2.tm_wday != time.tm_wday ||
+						    time2.tm_hour != time.tm_hour ||
+						    time2.tm_min != time.tm_min) {
+							printf("%s: add_minute: "
+							    "%d-%d-%d,%d %d:%d must be"
+							    " %d-%d-%d,%d %d:%d\n",
+							    argv[0],
+							    time2.tm_year, time2.tm_mon,
+							    time2.tm_mday, time2.tm_wday,
+							    time2.tm_hour, time2.tm_min,
+							    time.tm_year, time.tm_mon,
+							    time.tm_mday, time.tm_wday,
+							    time.tm_hour, time.tm_min);
+							return EX_SOFTWARE;
+						}
+						time2 = add_minute(time2, false);
+					}
+				}
+				if (++time.tm_wday == 8)
+					time.tm_wday = 1;
+			}
+		}
+	}
+
+	/* substract_minute(): check for every minute increase if it matches */
+	time2.tm_year = base_year + 399;
+	time2.tm_mon = 12;
+	time2.tm_mday = 31;
+	time2.tm_wday = 7;
+	time2.tm_hour = 23;
+	time2.tm_min = 59;
+	/* extra fields: */
+	time2.tm_sec = 0;
+	time2.tm_yday = 0;
+	time2.tm_isdst = -1;
+	time2.tm_zone = NULL;
+	time.tm_wday = 7;
+	for (time.tm_year = base_year + 399; time.tm_year >= base_year;
+	    time.tm_year--) {
+		for (time.tm_mon = 12; time.tm_mon > 0; time.tm_mon--) {
+			int lday = lastday(time);
+			for (time.tm_mday = lday; time.tm_mday > 0; time.tm_mday--) {
+				for (time.tm_hour = 23; time.tm_hour >= 0;
+				    time.tm_hour--) {
+					for (time.tm_min = 59; time.tm_min >= 0;
+					    time.tm_min--) {
+						if (time2.tm_year != time.tm_year ||
+						    time2.tm_mon != time.tm_mon ||
+						    time2.tm_mday != time.tm_mday ||
+						    time2.tm_wday != time.tm_wday ||
+						    time2.tm_hour != time.tm_hour ||
+						    time2.tm_min != time.tm_min) {
+							printf("%s: substract_minute: "
+							    " %d-%d-%d,%d %d:%d must be"
+							    " %d-%d-%d,%d %d:%d\n",
+							    argv[0],
+							    time2.tm_year, time2.tm_mon,
+							    time2.tm_mday, time2.tm_wday,
+							    time2.tm_hour, time2.tm_min,
+							    time.tm_year, time.tm_mon,
+							    time.tm_mday, time.tm_wday,
+							    time.tm_hour, time.tm_min);
+							return EX_SOFTWARE;
+						}
+						time2 = substract_minute(time2, false);
+					}
+				}
+				if (--time.tm_wday == 0)
+					time.tm_wday = 7;
+			}
+		}
+	}
+
+	/* get_utchour(): check for each hour if it matches */
+	i = test_utc(argv[0], 1);
+	if (i != EX_OK)
+		return i;
+	i = test_utc(argv[0], 2);
+	if (i != EX_OK)
+		return i;
+
+	/* get_isotime(): check for each minute or day if it matches */
+	/* get_dcftime(): check for each minute or day if it matches */
+
 	return EX_OK;
 }