zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/build/uClibc/libm/s_ldexp.c b/ap/build/uClibc/libm/s_ldexp.c
new file mode 100644
index 0000000..bc0f08e
--- /dev/null
+++ b/ap/build/uClibc/libm/s_ldexp.c
@@ -0,0 +1,39 @@
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#include "math.h"
+#include "math_private.h"
+#include <errno.h>
+
+/* TODO: POSIX says:
+ *
+ * "If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+ * then errno shall be set to [ERANGE]. If the integer expression
+ * (math_errhandling & MATH_ERREXCEPT) is non-zero, then the underflow
+ * floating-point exception shall be raised."
+ *
+ * *And it says the same about scalbn*! Thus these two functions
+ * are the same and can be just aliased.
+ *
+ * Currently, ldexp tries to be vaguely POSIX compliant while scalbn
+ * does not (it does not set ERRNO).
+ */
+
+double ldexp(double value, int _exp)
+{
+ if (!isfinite(value) || value == 0.0)
+ return value;
+ value = scalbn(value, _exp);
+ if (!isfinite(value) || value == 0.0)
+ errno = ERANGE;
+ return value;
+}
+libm_hidden_def(ldexp)