1 files changed, 15 insertions, 0 deletions
diff --git a/trunk/missing/isnan.c b/trunk/missing/isnan.c
new file mode 100644
index 0000000000..a8733978ad
--- /dev/null
+++ b/trunk/missing/isnan.c
@@ -0,0 +1,15 @@
+/* public domain rewrite of isnan(3) */
+
+static int double_ne(double n1, double n2);
+
+int
+isnan(double n)
+{
+    return double_ne(n, n);
+}
+
+static int
+double_ne(double n1, double n2)
+{
+    return n1 != n2;
+}