config.h

/* Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
 * All rights reserved. This code is under the AGPL license, check the
 * LICENSE file for more info. */

#ifndef __CONFIG_H
#define __CONFIG_H

#ifdef __APPLE__
#include <AvailabilityMacros.h>
#endif

#ifdef __linux__
#include <linux/version.h>
#include <features.h>
#endif

/* Byte ordering detection */
#include <sys/types.h> /* This will likely define BYTE_ORDER */

#ifndef BYTE_ORDER
#if (BSD >= 199103)
# include <machine/endian.h>
#else
#if defined(linux) || defined(__linux__)
# include <endian.h>
#else
#define	LITTLE_ENDIAN	1234	/* least-significant byte first (vax, pc) */
#define	BIG_ENDIAN	4321	/* most-significant byte first (IBM, net) */
#define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long (pdp)*/

#if defined(__i386__) || defined(__x86_64__) || defined(__amd64__) || \
   defined(vax) || defined(ns32000) || defined(sun386) || \
   defined(MIPSEL) || defined(_MIPSEL) || defined(BIT_ZERO_ON_RIGHT) || \
   defined(__alpha__) || defined(__alpha)
#define BYTE_ORDER    LITTLE_ENDIAN
#endif

#if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \
    defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \
    defined(MIPSEB) || defined(_MIPSEB) || defined(_IBMR2) || defined(DGUX) ||\
    defined(apollo) || defined(__convex__) || defined(_CRAY) || \
    defined(__hppa) || defined(__hp9000) || \
    defined(__hp9000s300) || defined(__hp9000s700) || \
    defined (BIT_ZERO_ON_LEFT) || defined(m68k) || defined(__sparc)
#define BYTE_ORDER	BIG_ENDIAN
#endif
#endif /* linux */
#endif /* BSD */
#endif /* BYTE_ORDER */

/* Sometimes after including an OS-specific header that defines the
 * endianess we end with __BYTE_ORDER but not with BYTE_ORDER that is what
 * the Redis code uses. In this case let's define everything without the
 * underscores. */
#ifndef BYTE_ORDER
#ifdef __BYTE_ORDER
#if defined(__LITTLE_ENDIAN) && defined(__BIG_ENDIAN)
#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN __LITTLE_ENDIAN
#endif
#ifndef BIG_ENDIAN
#define BIG_ENDIAN __BIG_ENDIAN
#endif
#if (__BYTE_ORDER == __LITTLE_ENDIAN)
#define BYTE_ORDER LITTLE_ENDIAN
#else
#define BYTE_ORDER BIG_ENDIAN
#endif
#endif
#endif
#endif

#if !defined(BYTE_ORDER) || \
    (BYTE_ORDER != BIG_ENDIAN && BYTE_ORDER != LITTLE_ENDIAN)
	/* you must determine what the correct bit order is for
	 * your compiler - the next line is an intentional error
	 * which will force your compiles to bomb until you fix
	 * the above macros.
	 */
#error "Undefined or invalid BYTE_ORDER"
#endif

#endif