20060303a

1 files changed, 26 insertions, 0 deletions

diff --git a/libkern/floor.c b/libkern/floor.c
new file mode 100644
index 00000000..86e6c816
--- /dev/null
+++ b/libkern/floor.c
@@ -0,0 +1,26 @@
+#include <lib9.h>
+/*
+ * floor and ceil-- greatest integer <= arg
+ * (resp least >=)
+ */
+
+double
+floor(double d)
+{
+	double fract;
+
+	if(d < 0) {
+		fract = modf(-d, &d);
+		if(fract != 0.0)
+			d += 1;
+		d = -d;
+	} else
+		modf(d, &d);
+	return d;
+}
+
+double
+ceil(double d)
+{
+	return -floor(-d);
+}