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-rw-r--r--src/endian_check.cpp52
1 files changed, 52 insertions, 0 deletions
diff --git a/src/endian_check.cpp b/src/endian_check.cpp
new file mode 100644
index 000000000..a302ea40b
--- /dev/null
+++ b/src/endian_check.cpp
@@ -0,0 +1,52 @@
+/* $Id$ */
+
+#include <stdio.h>
+
+// This pretty simple file checks if the system is LITTLE_ENDIAN or BIG_ENDIAN
+// it does that by putting a 1 and a 0 in an array, and read it out as one
+// number. If it is 1, it is LITTLE_ENDIAN, if it is 256, it is BIG_ENDIAN
+//
+// After that it outputs the contents of an include files (endian.h)
+// that says or TTD_LITTLE_ENDIAN, or TTD_BIG_ENDIAN. Makefile takes
+// care of the real writing to the file.
+
+int main (int argc, char *argv[]) {
+ unsigned char EndianTest[2] = { 1, 0 };
+ int force_BE = 0, force_LE = 0, force_PREPROCESSOR = 0;
+
+ if (argc > 1 && strcmp(argv[1], "BE") == 0)
+ force_BE = 1;
+ if (argc > 1 && strcmp(argv[1], "LE") == 0)
+ force_LE = 1;
+ if (argc > 1 && strcmp(argv[1], "PREPROCESSOR") == 0)
+ force_PREPROCESSOR = 1;
+
+ printf("#ifndef ENDIAN_H\n#define ENDIAN_H\n");
+
+ if (force_LE == 1) {
+ printf("#define TTD_LITTLE_ENDIAN\n");
+ } else {
+ if (force_BE == 1) {
+ printf("#define TTD_BIG_ENDIAN\n");
+ } else {
+ if (force_PREPROCESSOR == 1) {
+ // adding support for universal binaries on OSX
+ // Universal binaries supports both PPC and x86
+ // If a compiler for OSX gets this setting, it will always pick the correct endian and no test is needed
+ printf("#ifdef __BIG_ENDIAN__\n");
+ printf("#define TTD_BIG_ENDIAN\n");
+ printf("#else\n");
+ printf("#define TTD_LITTLE_ENDIAN\n");
+ printf("#endif\n");
+ } else {
+ if ( *(short *) EndianTest == 1 )
+ printf("#define TTD_LITTLE_ENDIAN\n");
+ else
+ printf("#define TTD_BIG_ENDIAN\n");
+ }
+ }
+ }
+ printf("#endif\n");
+
+ return 0;
+}