byte ordering detection in config.h

1 files changed, 58 insertions, 6 deletions

diff --git a/src/config.h b/src/config.h
index 40f22fa51..07700bed6 100644
--- a/src/config.h
+++ b/src/config.h
@@ -21,7 +21,7 @@
 #define redis_malloc_size(p) malloc_size(p)
 #endif
 
-/* define redis_fstat to fstat or fstat64() */
+/* Tefine redis_fstat to fstat or fstat64() */
 #if defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_6)
 #define redis_fstat fstat64
 #define redis_stat stat64
@@ -30,22 +30,22 @@
 #define redis_stat stat
 #endif
 
-/* test for proc filesystem */
+/* Test for proc filesystem */
 #ifdef __linux__
 #define HAVE_PROCFS 1
 #endif
 
-/* test for task_info() */
+/* Test for task_info() */
 #if defined(__APPLE__)
 #define HAVE_TASKINFO 1
 #endif
 
-/* test for backtrace() */
+/* Test for backtrace() */
 #if defined(__APPLE__) || defined(__linux__)
 #define HAVE_BACKTRACE 1
 #endif
 
-/* test for polling API */
+/* Test for polling API */
 #ifdef __linux__
 #define HAVE_EPOLL 1
 #endif
@@ -54,11 +54,63 @@
 #define HAVE_KQUEUE 1
 #endif
 
-/* define aof_fsync to fdatasync() in Linux and fsync() for all the rest */
+/* Define aof_fsync to fdatasync() in Linux and fsync() for all the rest */
 #ifdef __linux__
 #define aof_fsync fdatasync
 #else
 #define aof_fsync fsync
 #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(vax) || defined(ns32000) || defined(sun386) || defined(__i386__) || \
+    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 */
+
+#if defined(__BYTE_ORDER) && !defined(BYTE_ORDER)
+#if (__BYTE_ORDER == __LITTLE_ENDIAN)
+#define BYTE_ORDER LITTLE_ENDIAN
+#else
+#define BYTE_ORDER BIG_ENDIAN
+#endif
+#endif
+
+#if !defined(BYTE_ORDER) || \
+    (BYTE_ORDER != BIG_ENDIAN && BYTE_ORDER != LITTLE_ENDIAN && \
+    BYTE_ORDER != PDP_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