1 files changed, 16 insertions, 0 deletions
diff --git a/libc/misc/internals/zoicheck.c b/libc/misc/internals/zoicheck.c
new file mode 100644
index 000000000..2113c6298
--- /dev/null
+++ b/libc/misc/internals/zoicheck.c
@@ -0,0 +1,16 @@
+
+/*
+ * Copyright (C) 2000 Manuel Novoa III
+ *
+ * This is a utility routine for strtod errno support.
+ * As the name implies, it checks if a double is either 0 or +/-infinity.
+ * Doing this inline doesn't work on i386 because of excess precission
+ * stored in the FPU.
+ *
+ * TODO: Check bitmasks directly?
+ */
+
+int _zero_or_inf_check(double x)
+{
+	return ( x == x/4 );
+}