Simplify endian (byte order) detection

The following:

    #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
    #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__

are apparently semi-standard nowadays.

c/dtypes.h

@@ -60,33 +60,6 @@
 #define DLLEXPORT __attribute__((visibility("default")))
 #endif
 
-#if defined(LINUX)
-#include <features.h>
-#include <endian.h>
-#define LITTLE_ENDIAN __LITTLE_ENDIAN
-#define BIG_ENDIAN __BIG_ENDIAN
-#define PDP_ENDIAN __PDP_ENDIAN
-#define BYTE_ORDER __BYTE_ORDER
-#elif defined(MACOSX) || defined(OPENBSD) || defined(FREEBSD)
-#include <machine/endian.h>
-#define __LITTLE_ENDIAN LITTLE_ENDIAN
-#define __BIG_ENDIAN BIG_ENDIAN
-#define __PDP_ENDIAN PDP_ENDIAN
-#define __BYTE_ORDER BYTE_ORDER
-#elif defined(WIN32)
-#define __LITTLE_ENDIAN 1234
-#define __BIG_ENDIAN 4321
-#define __PDP_ENDIAN 3412
-#define __BYTE_ORDER __LITTLE_ENDIAN
-#define __FLOAT_WORD_ORDER __LITTLE_ENDIAN
-#define LITTLE_ENDIAN __LITTLE_ENDIAN
-#define BIG_ENDIAN __BIG_ENDIAN
-#define PDP_ENDIAN __PDP_ENDIAN
-#define BYTE_ORDER __BYTE_ORDER
-#else
-#error "unknown platform"
-#endif
-
 #define LLT_ALLOC(n) malloc(n)
 #define LLT_REALLOC(p, n) realloc((p), (n))
 #define LLT_FREE(x) free(x)

c/flisp.c

@@ -924,18 +924,21 @@ no_kw:
     return nargs;
 }
 
-#if BYTE_ORDER == BIG_ENDIAN
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 #define GET_INT32(a)                                             \
     ((int32_t)((((int32_t)a[0]) << 0) | (((int32_t)a[1]) << 8) | \
                (((int32_t)a[2]) << 16) | (((int32_t)a[3]) << 24)))
 #define GET_INT16(a) \
     ((int16_t)((((int16_t)a[0]) << 0) | (((int16_t)a[1]) << 8)))
 #define PUT_INT32(a, i) (*(int32_t *)(a) = bswap_32((int32_t)(i)))
-#else
+#endif
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 #define GET_INT32(a) (*(int32_t *)a)
 #define GET_INT16(a) (*(int16_t *)a)
 #define PUT_INT32(a, i) (*(int32_t *)(a) = (int32_t)(i))
 #endif
+
 #define SWAP_INT32(a) (*(int32_t *)(a) = bswap_32(*(int32_t *)(a)))
 #define SWAP_INT16(a) (*(int16_t *)(a) = bswap_16(*(int16_t *)(a)))
 
@@ -2243,7 +2246,7 @@ static value_t fl_function(value_t *args, uint32_t nargs)
         for (i = 0; i < sz; i++)
             data[i] -= 48;
     } else {
-#if BYTE_ORDER == BIG_ENDIAN
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
         swap = 1;
 #endif
     }

c/hashing.c

@@ -2,18 +2,6 @@
   Hashing
 */
 
-#ifndef WIN32
-#include <sys/param.h> /* attempt to define endianness */
-#else
-typedef unsigned int uint32_t;
-typedef unsigned char uint8_t;
-typedef unsigned short uint16_t;
-#endif
-
-#ifdef LINUX
-#include <endian.h> /* attempt to define endianness */
-#endif
-
 #include <math.h>
 #include <stdarg.h>
 #include <stdint.h>

c/ieee754.h

@@ -2,12 +2,12 @@ union ieee754_float {
     float f;
 
     struct {
-#if BYTE_ORDER == BIG_ENDIAN
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
         unsigned int negative : 1;
         unsigned int exponent : 8;
         unsigned int mantissa : 23;
 #endif
-#if BYTE_ORDER == LITTLE_ENDIAN
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
         unsigned int mantissa : 23;
         unsigned int exponent : 8;
         unsigned int negative : 1;
@@ -21,13 +21,13 @@ union ieee754_double {
     double d;
 
     struct {
-#if BYTE_ORDER == BIG_ENDIAN
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
         unsigned int negative : 1;
         unsigned int exponent : 11;
         unsigned int mantissa0 : 20;
         unsigned int mantissa1 : 32;
 #endif
-#if BYTE_ORDER == LITTLE_ENDIAN
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
         unsigned int mantissa1 : 32;
         unsigned int mantissa0 : 20;
         unsigned int exponent : 11;
@@ -42,14 +42,14 @@ union ieee854_long_double {
     long double d;
 
     struct {
-#if BYTE_ORDER == BIG_ENDIAN
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
         unsigned int negative : 1;
         unsigned int exponent : 15;
         unsigned int empty : 16;
         unsigned int mantissa0 : 32;
         unsigned int mantissa1 : 32;
 #endif
-#if BYTE_ORDER == LITTLE_ENDIAN
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
         unsigned int mantissa1 : 32;
         unsigned int mantissa0 : 32;
         unsigned int exponent : 15;

c/lookup3.h

@@ -35,24 +35,14 @@ on 1 byte), but shoehorning those bytes into integers efficiently is messy.
 */
 //#define SELF_TEST 1
 
-/*
- * My best guess at if you are big-endian or little-endian.  This may
- * need adjustment.
- */
-#if (defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) &&   \
-     __BYTE_ORDER == __LITTLE_ENDIAN) ||                    \
-(defined(i386) || defined(__i386__) || defined(__i486__) || \
- defined(__i586__) || defined(__i686__) || defined(vax) || defined(MIPSEL))
-#define HASH_LITTLE_ENDIAN 1
-#define HASH_BIG_ENDIAN 0
-#elif (defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && \
-       __BYTE_ORDER == __BIG_ENDIAN) ||                  \
-(defined(sparc) || defined(POWERPC) || defined(mc68000) || defined(sel))
-#define HASH_LITTLE_ENDIAN 0
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 #define HASH_BIG_ENDIAN 1
-#else
 #define HASH_LITTLE_ENDIAN 0
+#endif
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 #define HASH_BIG_ENDIAN 0
+#define HASH_LITTLE_ENDIAN 1
 #endif
 
 #define hashsize(n) ((uint32_t)1 << (n))