[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/string/byteswap.h b/ap/libc/glibc/glibc-2.23/string/byteswap.h
new file mode 100644
index 0000000..d98618c
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/string/byteswap.h
@@ -0,0 +1,39 @@
+/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _BYTESWAP_H
+#define _BYTESWAP_H 1
+
+#include <features.h>
+
+/* Get the machine specific, optimized definitions. */
+#include <bits/byteswap.h>
+
+
+/* The following definitions must all be macros since otherwise some
+ of the possible optimizations are not possible. */
+
+/* Return a value with all bytes in the 16 bit argument swapped. */
+#define bswap_16(x) __bswap_16 (x)
+
+/* Return a value with all bytes in the 32 bit argument swapped. */
+#define bswap_32(x) __bswap_32 (x)
+
+/* Return a value with all bytes in the 64 bit argument swapped. */
+#define bswap_64(x) __bswap_64 (x)
+
+#endif /* byteswap.h */