1 files changed, 34 insertions, 0 deletions
diff --git a/nuttx/lib/math/lib_frexp.c b/nuttx/lib/math/lib_frexp.c
new file mode 100644
index 000000000..102609dbe
--- /dev/null
+++ b/nuttx/lib/math/lib_frexp.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <apps/math.h>
+#include <float.h>
+
+float frexpf(float x, int *exp) {
+	*exp = (int) ceilf(log2f(x));
+	return x / ldexpf(1.0, *exp);
+}
+
+double frexp(double x, int *exp) {
+	*exp = (int) ceil(log2(x));
+	return x / ldexp(1.0, *exp);
+}
+
+long double frexpl(long double x, int *exp) {
+	*exp = (int) ceill(log2(x));
+	return x / ldexpl(1.0, *exp);
+}
+