usr: libc: Add math.h + musl math impl portexpt

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/libc/src/musl-math/significand.c b/lib/libc/src/musl-math/significand.c
new file mode 100644
index 0000000..40d9aa9
--- /dev/null
+++ b/lib/libc/src/musl-math/significand.c
@@ -0,0 +1,7 @@
+#define _GNU_SOURCE
+#include <math.h>
+
+double significand(double x)
+{
+	return scalbn(x, -ilogb(x));
+}