Bring in.h - IPv4

bsd/machine/endian.h

+/*-
+ * Copyright (c) 1987, 1991 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)endian.h	7.8 (Berkeley) 4/3/91
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_ENDIAN_H_
+#define	_MACHINE_ENDIAN_H_
+
+#include <sys/cdefs.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Define the order of 32-bit words in 64-bit words.
+ */
+#define	_QUAD_HIGHWORD 1
+#define	_QUAD_LOWWORD 0
+
+/*
+ * Definitions for byte order, according to byte significance from low
+ * address to high.
+ */
+#define	_LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
+#define	_BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
+#define	_PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
+
+#define	_BYTE_ORDER	_LITTLE_ENDIAN
+
+/*
+ * Deprecated variants that don't have enough underscores to be useful in more
+ * strict namespaces.
+ */
+#if __BSD_VISIBLE
+#define	LITTLE_ENDIAN	_LITTLE_ENDIAN
+#define	BIG_ENDIAN	_BIG_ENDIAN
+#define	PDP_ENDIAN	_PDP_ENDIAN
+#define	BYTE_ORDER	_BYTE_ORDER
+#endif
+
+#if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE_BUILTIN_CONSTANT_P)
+
+#define	__bswap64_const(_x)			\
+	(((_x) >> 56) |				\
+	(((_x) >> 40) & (0xffUL << 8)) |	\
+	(((_x) >> 24) & (0xffUL << 16)) |	\
+	(((_x) >> 8) & (0xffUL << 24)) |	\
+	(((_x) << 8) & (0xffUL << 32)) |	\
+	(((_x) << 24) & (0xffUL << 40)) |	\
+	(((_x) << 40) & (0xffUL << 48)) |	\
+	((_x) << 56))
+
+#define	__bswap32_const(_x)			\
+	(((_x) >> 24) |				\
+	(((_x) & (0xff << 16)) >> 8) |		\
+	(((_x) & (0xff << 8)) << 8) |		\
+	((_x) << 24))
+
+#define __bswap16_const(_x)	(__uint16_t)((_x) << 8 | (_x) >> 8)
+
+static __inline __uint64_t
+__bswap64_var(__uint64_t _x)
+{
+
+	__asm ("bswap %0" : "+r" (_x));
+	return (_x);
+}
+
+static __inline __uint32_t
+__bswap32_var(__uint32_t _x)
+{
+
+	__asm ("bswap %0" : "+r" (_x));
+	return (_x);
+}
+
+static __inline __uint16_t
+__bswap16_var(__uint16_t _x)
+{
+
+	return (__bswap16_const(_x));
+}
+
+#define	__bswap64(_x)					\
+	(__builtin_constant_p(_x) ?			\
+	    __bswap64_const((__uint64_t)(_x)) : __bswap64_var(_x))
+
+#define	__bswap32(_x)					\
+	(__builtin_constant_p(_x) ?			\
+	    __bswap32_const((__uint32_t)(_x)) : __bswap32_var(_x))
+
+#define	__bswap16(_x)					\
+	((__uint16_t)(__builtin_constant_p(_x) ?	\
+	    __bswap16_const((__uint16_t)(_x)) : __bswap16_var(_x)))
+
+#define	__htonl(x)	__bswap32(x)
+#define	__htons(x)	__bswap16(x)
+#define	__ntohl(x)	__bswap32(x)
+#define	__ntohs(x)	__bswap16(x)
+
+#else /* !(__GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P) */
+
+/*
+ * No optimizations are available for this compiler.  Fall back to
+ * non-optimized functions by defining the constant usually used to prevent
+ * redefinition.
+ */
+#define	_BYTEORDER_FUNC_DEFINED
+
+#endif /* __GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !_MACHINE_ENDIAN_H_ */