Part I of port of Rhombus math library

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5269 42af7a65-404d-4744-a932-0658087f49c3

nuttx/lib/math/lib_fmod.c

@@ -0,0 +1,67 @@
+/*
+ * 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>
+
+/* If GCC/CLang builtins are available, use them */
+#ifdef __GNUC__
+
+float fmodf(float x, float div) {
+	return __builtin_fmodf(x, div);
+}
+
+double fmod(double x, double div) {
+	return __builtin_fmod(x, div);
+}
+
+long double fmodl(long double x, long double div) {
+	return __builtin_fmodl(x, div);
+}
+
+#else
+
+float fmodf(float x, float div) {
+	float n0;
+
+	x /= div;
+	x = modff(x, &n0);
+	x *= div;
+
+	return x;
+}
+
+double fmod(double x, double div) {
+	double n0;
+
+	x /= div;
+	x = modf(x, &n0);
+	x *= div;
+
+	return x;
+}
+
+long double fmodl(long double x, long double div) {
+	long double n0;
+
+	x /= div;
+	x = modfl(x, &n0);
+	x *= div;
+
+	return x;
+}
+
+#endif