implement endiannes run-time detection

CMakeLists.txt

@@ -7,6 +7,7 @@ set(HEADERS
     list.h
     array.h
     bitmap.h
+    endian.h
 )
 
 set(SOURCES
@@ -14,6 +15,7 @@ set(SOURCES
     list.c
     array.c
     bitmap.c
+    endian.c
 )
 
 add_library(cutil STATIC ${SOURCES} ${HEADERS})

cutil.c

@@ -1,4 +1,5 @@
 #include "cutil.h"
+#include "endian.h"
 #include <string.h>
 
 void* (*cu_malloc)(size_t);
@@ -10,6 +11,8 @@ void* (*cu_memmove)(void*,const void*,size_t);
 
 void cutil_init()
 {
+    cu_endian_init();
+
     cu_malloc = CUTIL_MALLOC;
     cu_realloc = CUTIL_REALLOC;
     cu_free = CUTIL_FREE;

cutypes.h

@@ -89,7 +89,7 @@ typedef int64_t iword;
 typedef uint32_t uword;
 typedef int32_t iword;
 #else
-#   warning "define CU_32BIT or CU_64BIT"
+#   warning "unknown bus width for arch " CU_ARCH
 #endif
 
 typedef uint32_t uint;

endian.c

@@ -0,0 +1,27 @@
+#include "endian.h"
+
+enum cu_endian_e cu_endian;
+
+static const union {
+    uint8_t bytes[4];
+    uint32_t value;
+} host_order = {
+    {0, 1, 2, 3}
+};
+
+#define ORDER_LITTLE_ENDIAN     0x03020100
+#define ORDER_BIG_ENDIAN        0x00010203
+#define ORDER_PDP_ENDIAN        0x01000302
+#define ORDER_HONEYWELL_ENDIAN  0x02030001
+
+void cu_endian_init()
+{
+    if (host_order.value == ORDER_LITTLE_ENDIAN)
+        cu_endian = LittleEndian;
+    else if (host_order.value == ORDER_BIG_ENDIAN)
+        cu_endian = BigEndian;
+    else if (host_order.value == ORDER_PDP_ENDIAN)
+        cu_endian = PDPEndian;
+    else if (host_order.value == ORDER_HONEYWELL_ENDIAN)
+        cu_endian = HoneywellEndian;
+}

endian.h

@@ -0,0 +1,17 @@
+#ifndef __ENDIAN_H
+#define __ENDIAN_H
+
+#include "cutypes.h"
+
+enum cu_endian_e {
+    LittleEndian,
+    BigEndian,
+    PDPEndian,
+    HoneywellEndian
+};
+
+extern enum cu_endian_e cu_endian;
+
+void cu_endian_init();
+
+#endif

test.c

@@ -5,6 +5,7 @@
 #include "list.h"
 #include "array.h"
 #include "bitmap.h"
+#include "endian.h"
 
 int main()
 {
@@ -76,6 +77,7 @@ int main()
 
     printf("[cutil]\n");
     printf("cutil_arch\t%u\n", CU_ARCH);
+    printf("cutil_endian\t%u\n", cu_endian);
 
     cutil_exit();
     return 0;