Virgin import of ntpd 4.0.98f

1 files changed, 37 insertions, 0 deletions

diff --git a/contrib/ntp/libntp/ymd2yd.c b/contrib/ntp/libntp/ymd2yd.c
new file mode 100644
index 0000000..796ce40
--- /dev/null
+++ b/contrib/ntp/libntp/ymd2yd.c
@@ -0,0 +1,37 @@
+/*
+ * ymd2yd - compute the date in the year from y/m/d
+ */
+
+#include "ntp_fp.h"
+#include "ntp_unixtime.h"
+#include "ntp_stdlib.h"
+
+/*
+ * Tables to compute the day of year from yyyymmdd timecode.
+ * Viva la leap.
+ */
+static int day1tab[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+static int day2tab[] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+int
+ymd2yd(
+	int y,
+	int m,
+	int d
+	)
+{
+	int i, *t;
+
+	if (m < 1 || m > 12 || d < 1)
+		return (-1);
+
+	if (((y%4 == 0) && (y%100 != 0)) || (y%400 == 0))
+		t = day2tab;	/* leap year */
+	else
+		t = day1tab;	/* not a leap year */
+	if (d > t[m - 1])
+		return (-1);
+	for (i = 0; i < m - 1; i++)
+		d += t[i];
+	return d;
+}