1 files changed, 27 insertions, 0 deletions
diff --git a/src/base/math/floor.c b/src/base/math/floor.c
new file mode 100644
index 0000000..60c5ad0
--- /dev/null
+++ b/src/base/math/floor.c
@@ -0,0 +1,27 @@
+#include <u.h>
+#include <base.h>
+/*
+ * floor and ceil-- greatest integer <= arg
+ * (resp least >=)
+ */
+
+double
+math·floor(double d)
+{
+	double fract;
+
+	if(d < 0) {
+		fract = math·modf(-d, &d);
+		if(fract != 0.0)
+			d += 1;
+		d = -d;
+	} else
+		math·modf(d, &d);
+	return d;
+}
+
+double
+math·ceil(double d)
+{
+	return -math·floor(-d);
+}