From 30634165980deaeead9f4e71e0ff6a5c9d897776 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Mon, 14 Jul 2025 22:39:34 -0400
Subject: usr: libc: Add math.h + musl math impl port

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 lib/libc/src/musl-math/nearbyint.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 lib/libc/src/musl-math/nearbyint.c

(limited to 'lib/libc/src/musl-math/nearbyint.c')

diff --git a/lib/libc/src/musl-math/nearbyint.c b/lib/libc/src/musl-math/nearbyint.c
new file mode 100644
index 0000000..f4e8aac
--- /dev/null
+++ b/lib/libc/src/musl-math/nearbyint.c
@@ -0,0 +1,20 @@
+#include <fenv.h>
+#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;
+}
-- 
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