Import sources from 2011-03-30 iso image

1 files changed, 54 insertions, 0 deletions

diff --git a/sys/src/ape/lib/ap/plan9/nan.c b/sys/src/ape/lib/ap/plan9/nan.c
new file mode 100755
index 000000000..db7c13fe8
--- /dev/null
+++ b/sys/src/ape/lib/ap/plan9/nan.c
@@ -0,0 +1,54 @@
+#include <float.h>
+#include <math.h>
+
+#define	NANEXP	(2047<<20)
+#define	NANMASK	(2047<<20)
+#define	NANSIGN	(1<<31)
+
+double
+NaN(void)
+{
+	FPdbleword a;
+
+	a.hi = NANEXP;
+	a.lo = 1;
+	return a.x;
+}
+
+int
+isNaN(double d)
+{
+	FPdbleword a;
+
+	a.x = d;
+	if((a.hi & NANMASK) != NANEXP)
+		return 0;
+	return !isInf(d, 0);
+}
+
+double
+Inf(int sign)
+{
+	FPdbleword a;
+
+	a.hi = NANEXP;
+	a.lo = 0;
+	if(sign < 0)
+		a.hi |= NANSIGN;
+	return a.x;
+}
+
+int
+isInf(double d, int sign)
+{
+	FPdbleword a;
+
+	a.x = d;
+	if(a.lo != 0)
+		return 0;
+	if(a.hi == NANEXP)
+		return sign >= 0;
+	if(a.hi == (NANEXP|NANSIGN))
+		return sign <= 0;
+	return 0;
+}