Astro with some minor changes to placate Unix.

src/cmd/astro/pdate.c

@@ -0,0 +1,313 @@
+#include "astro.h"
+
+
+char*	month[] =
+{
+	"January",
+	"February",
+	"March",
+	"April",
+	"May",
+	"June",
+	"July",
+	"August",
+	"September",
+	"October",
+	"November",
+	"December",
+};
+
+double
+dsrc(double d, Tim *t, int i)
+{
+	double y;
+
+	do {
+		t->ifa[i] += 1.;
+		y = convdate(t);
+	} while(d >= y);
+	do {
+		t->ifa[i] -= 1.;
+		y = convdate(t);
+	} while(d < y);
+	return d - y;
+}
+
+void
+dtsetup(double d, Tim *t)
+{
+	double v;
+
+	t->ifa[0] = floor(1900 + d/365.24220);
+	t->ifa[1] = 1;
+	t->ifa[2] = 1;
+	t->ifa[3] = 0;
+	t->ifa[4] = 0;
+	t->ifa[1] = floor(1 + dsrc(d, t, 0)/30);
+	t->ifa[2] = floor(1 + dsrc(d, t, 1));
+	dsrc(d, t, 2);
+
+	v = (d - convdate(t)) * 24;
+	t->ifa[3] = floor(v);
+	t->ifa[4] = (v - t->ifa[3]) * 60;
+	convdate(t);	/* to set timezone */
+}
+
+void
+pdate(double d)
+{
+	int i;
+	Tim t;
+
+	dtsetup(d, &t);
+	if(flags['s']) {
+		i = t.ifa[1];
+		print("%s ", month[i-1]);
+		i = t.ifa[2];
+		numb(i);
+		print("...");
+		return;
+	}
+
+	/* year month day */
+	print("%4d %2d %2d",
+		(int)t.ifa[0],
+		(int)t.ifa[1],
+		(int)t.ifa[2]);
+}
+
+void
+ptime(double d)
+{
+	int h, m, s;
+	char *mer;
+	Tim t;
+
+	if(flags['s']) {
+		/* hour minute */
+		dtsetup(d + .5/(24*60), &t);
+		h = t.ifa[3];
+		m = floor(t.ifa[4]);
+
+		mer = "AM";
+		if(h >= 12) {
+			mer = "PM";
+			h -= 12;
+		}
+		if(h == 0)
+			h = 12;
+		numb(h);
+		if(m < 10) {
+			if(m == 0) {
+				print("%s exactly ...", mer);
+				return;
+			}
+			print("O ");
+		}
+		numb(m);
+		print("%s ...", mer);
+		return;
+	}
+	/* hour minute second */
+	dtsetup(d, &t);
+	h = t.ifa[3];
+	m = floor(t.ifa[4]);
+	s = floor((t.ifa[4]-m) * 60);
+	print("%.2d:%.2d:%.2d %.*s", h, m, s, utfnlen(t.tz, 3), t.tz);
+}
+
+char*	unit[] =
+{
+	"zero",
+	"one",
+	"two",
+	"three",
+	"four",
+	"five",
+	"six",
+	"seven",
+	"eight",
+	"nine",
+	"ten",
+	"eleven",
+	"twelve",
+	"thirteen",
+	"fourteen",
+	"fifteen",
+	"sixteen",
+	"seventeen",
+	"eighteen",
+	"nineteen"
+};
+char*	decade[] =
+{
+	"twenty",
+	"thirty",
+	"forty",
+	"fifty",
+	"sixty",
+	"seventy",
+	"eighty",
+	"ninety"
+};
+
+void
+pstime(double d)
+{
+
+	setime(d);
+
+	semi = 0;
+	motion = 0;
+	rad = 1.e9;
+	lambda = 0;
+	beta = 0;
+
+// uses lambda, beta, rad, motion
+// sets alpha, delta, rp
+
+	helio();
+
+// uses alpha, delta, rp
+// sets ra, decl, lha, decl2, az, el
+
+	geo();
+
+	print(" %R %D %D %4.0f", lha, nlat, awlong, elev/3.28084);
+}
+
+void
+numb(int n)
+{
+
+	if(n >= 100) {
+		print("%d ", n);
+		return;
+	}
+	if(n >= 20) {
+		print("%s ", decade[n/10 - 2]);
+		n %= 10;
+		if(n == 0)
+			return;
+	}
+	print("%s ", unit[n]);
+}
+
+double
+tzone(double y, Tim *z)
+{
+	double t, l1, l2;
+	Tm t1, t2;
+
+	/*
+	 * get a rough approximation to unix mean time
+	 */
+	t = (y - 25567.5) * 86400;
+
+	/*
+	 * if outside unix conversions,
+	 * just call it GMT
+	 */
+	if(t < 0 || t > 2.1e9)
+		return y;
+
+	/*
+	 * convert by both local and gmt
+	 */
+	t1 = *localtime((long)t);
+	t2 = *gmtime((long)t);
+
+	/*
+	 * pick up year crossings
+	 */
+	if(t1.yday == 0 && t2.yday > 1)
+		t1.yday = t2.yday+1;
+	if(t2.yday == 0 && t1.yday > 1)
+		t2.yday = t1.yday+1;
+
+	/*
+	 * convert times to days
+	 */
+	l1 = t1.yday + t1.hour/24. + t1.min/1440. + t1.sec/86400.;
+	l2 = t2.yday + t2.hour/24. + t2.min/1440. + t2.sec/86400.;
+
+	/*
+	 * return difference
+	 */
+	strncpy(z->tz, t1.zone, sizeof(z->tz));
+	return y + (l2 - l1);
+}
+
+int	dmo[12] =
+{
+	0,
+	31,
+	59,
+	90,
+	120,
+	151,
+	181,
+	212,
+	243,
+	273,
+	304,
+	334
+};
+
+/*
+ * input date conversion
+ * output is done by zero crossing
+ * on this input conversion.
+ */
+double
+convdate(Tim *t)
+{
+	double y, d;
+	int m;
+
+	y = t->ifa[0];
+	m = t->ifa[1];
+	d = t->ifa[2];
+
+	/*
+	 * normalize the month
+	 */
+	while(m < 1) {
+		m += 12;
+		y -= 1;
+	}
+	while(m > 12) {
+		m -= 12;
+		y += 1;
+	}
+
+	/*
+	 * bc correction
+	 */
+	if(y < 0)
+		y += 1;
+
+	/*
+	 * normal conversion
+	 */
+	y += 4712;
+	if(fmod(y, 4) == 0 && m > 2)
+		d += 1;
+	y = y*365 + floor((y+3)/4) + dmo[m-1] + d - 1;
+
+	/*
+	 * gregorian change
+	 */
+	if(y > 2361232)
+		y -= floor((y-1794167)/36524.220) -
+			floor((y-1721117)/146100);
+	y += t->ifa[3]/24 + t->ifa[4]/1440 - 2415020.5;
+
+	/*
+	 * kitchen clock correction
+	 */
+	strncpy(t->tz, "GMT", sizeof(t->tz));
+	if(flags['k'])
+		y = tzone(y, t);
+	return y;
+}