Import sources from 2011-03-30 iso image

1 files changed, 261 insertions, 0 deletions

diff --git a/sys/src/cmd/astro/dist.c b/sys/src/cmd/astro/dist.c
new file mode 100755
index 000000000..7ff842ec0
--- /dev/null
+++ b/sys/src/cmd/astro/dist.c
@@ -0,0 +1,261 @@
+#include "astro.h"
+
+double
+dist(Obj1 *p, Obj1 *q)
+{
+	double a;
+
+	a = sin(p->decl2)*sin(q->decl2) +
+		cos(p->decl2)*cos(q->decl2)*cos(p->ra-q->ra);
+	a = fabs(atan2(pyth(a), a)) / radsec;
+	return a;
+}
+
+int
+rline(int f)
+{
+	char *p;
+	int c;
+	static char buf[1024];
+	static int bc, bn, bf;
+
+	if(bf != f) {
+		bf = f;
+		bn = 0;
+	}
+	p = line;
+	do {
+		if(bn <= 0) {
+			bn = read(bf, buf, sizeof(buf));
+			if(bn <= 0)
+				return 1;
+			bc = 0;
+		}
+		c = buf[bc];
+		bn--; bc++;
+		*p++ = c;
+	} while(c != '\n');
+	return 0;
+}
+
+double
+sunel(double t)
+{
+	int i;
+
+	i = floor(t);
+	if(i < 0 || i > NPTS+1)
+		return -90;
+	t = osun.point[i].el +
+		(t-i)*(osun.point[i+1].el - osun.point[i].el);
+	return t;
+}
+
+double
+rise(Obj2 *op, double el)
+{
+	Obj2 *p;
+	int i;
+	double e1, e2;
+
+	e2 = 0;
+	p = op;
+	for(i=0; i<=NPTS; i++) {
+		e1 = e2;
+		e2 = p->point[i].el;
+		if(i >= 1 && e1 <= el && e2 > el)
+			goto found;
+	}
+	return -1;
+
+found:
+	return i - 1 + (el-e1)/(e2-e1);
+}
+
+double
+set(Obj2 *op, double el)
+{
+	Obj2 *p;
+	int i;
+	double e1, e2;
+
+	e2 = 0;
+	p = op;
+	for(i=0; i<=NPTS; i++) {
+		e1 = e2;
+		e2 = p->point[i].el;
+		if(i >= 1 && e1 > el && e2 <= el)
+			goto found;
+	}
+	return -1;
+
+found:
+	return i - 1 + (el-e1)/(e2-e1);
+}
+
+double
+solstice(int n)
+{
+	int i;
+	double d1, d2, d3;
+
+	d3 = (n*pi)/2 - pi;
+	if(n == 0)
+		d3 += pi;
+	d2 = 0.;
+	for(i=0; i<=NPTS; i++) {
+		d1 = d2;
+		d2 = osun.point[i].ra;
+		if(n == 0) {
+			d2 -= pi;
+			if(d2 < -pi)
+				d2 += pipi;
+		}
+		if(i >= 1 && d3 >= d1 && d3 < d2)
+			goto found;
+	}
+	return -1;
+
+found:
+	return i - (d3-d2)/(d1-d2);
+}
+
+double
+betcross(double b)
+{
+	int i;
+	double d1, d2;
+
+	d2 = 0;
+	for(i=0; i<=NPTS; i++) {
+		d1 = d2;
+		d2 = osun.point[i].mag;
+		if(i >= 1 && b >= d1 && b < d2)
+			goto found;
+	}
+	return -1;
+
+found:
+	return i - (b-d2)/(d1-d2);
+}
+
+double
+melong(Obj2 *op)
+{
+	Obj2 *p;
+	int i;
+	double d1, d2, d3;
+
+	d2 = 0;
+	d3 = 0;
+	p = op;
+	for(i=0; i<=NPTS; i++) {
+		d1 = d2;
+		d2 = d3;
+		d3 = dist(&p->point[i], &osun.point[i]);
+		if(i >= 2 && d2 >= d1 && d2 >= d3)
+			goto found;
+	}
+	return -1;
+
+found:
+	return i - 2;
+}
+
+#define	NEVENT	100
+Event	events[NEVENT];
+Event*	eventp = 0;
+
+void
+event(char *format, char *arg1, char *arg2, double tim, int flag)
+{
+	Event *p;
+
+	if(flag & DARK)
+		if(sunel(tim) > -12)
+			return;
+	if(flag & LIGHT)
+		if(sunel(tim) < 0)
+			return;
+	if(eventp == 0)
+		eventp = events;
+	p = eventp;
+	if(p >= events+NEVENT) {
+		fprint(2, "too many events\n");
+		return;
+	}
+	eventp++;
+	p->format = format;
+	p->arg1 = arg1;
+	p->arg2 = arg2;
+	p->tim = tim;
+	p->flag = flag;
+}
+
+void
+evflush(void)
+{
+	Event *p;
+
+	if(eventp == 0)
+		return;
+	qsort(events, eventp-events, sizeof *p, evcomp);
+	for(p = events; p<eventp; p++) {
+		if((p->flag&SIGNIF) && flags['s'])
+			print("ding ding ding ");
+		print(p->format, p->arg1, p->arg2);
+		if(p->flag & PTIME)
+			ptime(day + p->tim*deld);
+		print("\n");
+	}
+	eventp = 0;
+}
+
+int
+evcomp(void *a1, void *a2)
+{
+	double t1, t2;
+	Event *p1, *p2;
+
+	p1 = a1;
+	p2 = a2;
+	t1 = p1->tim;
+	t2 = p2->tim;
+	if(p1->flag & SIGNIF)
+		t1 -= 1000.;
+	if(p2->flag & SIGNIF)
+		t2 -= 1000.;
+	if(t1 > t2)
+		return 1;
+	if(t2 > t1)
+		return -1;
+	return 0;
+}
+
+double
+pyth(double x)
+{
+
+	x *= x;
+	if(x > 1)
+		x = 1;
+	return sqrt(1-x);
+}
+
+char*
+skip(int n)
+{
+	int i;
+	char *cp;
+
+	cp = line;
+	for(i=0; i<n; i++) {
+		while(*cp == ' ' || *cp == '\t')
+			cp++;
+		while(*cp != '\n' && *cp != ' ' && *cp != '\t')
+			cp++;
+	}
+	while(*cp == ' ' || *cp == '\t')
+		cp++;
+	return cp;
+}