1 files changed, 12 insertions, 0 deletions
diff --git a/src/math/isnan.c b/src/math/isnan.c
new file mode 100644
index 00000000..2ae4b4d2
--- /dev/null
+++ b/src/math/isnan.c
@@ -0,0 +1,12 @@
+#include <math.h>
+                             int __isnanf(float x);
+                            int __isnand(double x);
+                       int __isnanl(long double x);
+
+#define isnan(x)              ((sizeof (x) == sizeof (float)) ? __isnanf(x) : \
+                    (sizeof (x) == sizeof (double)) ? __isnand(x) : __isnanl(x))
+
+/*
+STDC(199901)
+LINK(m)
+*/