Fix registering the DST or leap second announcement in case the progr…

…am is started after half the hour.

Use the number of correctly received minutes in this hour instead of the
current minute value to compare the number of correctly received
announcements against.

Issue #31

decode_time.c

@@ -9,7 +9,7 @@
 #include <string.h>
 #include <time.h>
 
-static int dst_count, leap_count;
+static int dst_count, leap_count, minute_count;
 static struct DT_result dt_res;
 
 static bool
@@ -227,7 +227,7 @@ handle_leap_second(unsigned errflags, int minlen, const int buffer[],
 	if (buffer[19] == 1 && errflags == 0)
 		leap_count++;
 	if (time.tm_min > 0)
-		dt_res.leap_announce = 2 * leap_count > time.tm_min;
+		dt_res.leap_announce = 2 * leap_count > minute_count;
 
 	/* process possible leap second */
 	if (dt_res.leap_announce && time.tm_min == 0) {
@@ -263,7 +263,7 @@ handle_dst(unsigned errflags, bool olderr, const int buffer[], struct tm time,
 	if (buffer[16] == 1 && errflags == 0)
 		dst_count++;
 	if (time.tm_min > 0)
-		dt_res.dst_announce = 2 * dst_count > time.tm_min;
+		dt_res.dst_announce = 2 * dst_count > minute_count;
 
 	if (buffer[17] != time.tm_isdst || buffer[18] == time.tm_isdst) {
 		/*
@@ -316,9 +316,11 @@ decode_time(unsigned init_min, int minlen, unsigned acc_minlen,
 	newtime.tm_isdst = time->tm_isdst; /* save DST value */
 
 	errflags = check_time_sanity(minlen, buffer) ? 0 : 1;
-
-	if (errflags == 0)
+	if (errflags == 0) {
 		handle_special_bits(buffer);
+		if (++minute_count == 60)
+			minute_count = 0;
+	}
 
 	increase = increase_old_time(init_min, minlen, acc_minlen, time);