add circuitpython code

1 files changed, 19 insertions, 0 deletions

diff --git a/circuitpython/lib/libm_dbl/nearbyint.c b/circuitpython/lib/libm_dbl/nearbyint.c
new file mode 100644
index 0000000..c3a0b88
--- /dev/null
+++ b/circuitpython/lib/libm_dbl/nearbyint.c
@@ -0,0 +1,19 @@
+#include <math.h>
+
+/* nearbyint is the same as rint, but it must not raise the inexact exception */
+
+double nearbyint(double x)
+{
+#ifdef FE_INEXACT
+	#pragma STDC FENV_ACCESS ON
+	int e;
+
+	e = fetestexcept(FE_INEXACT);
+#endif
+	x = rint(x);
+#ifdef FE_INEXACT
+	if (!e)
+		feclearexcept(FE_INEXACT);
+#endif
+	return x;
+}