tron@2186: /* $Id$ */
tron@2186: 
truelight@157: #include <stdio.h>
truelight@157: 
truelight@157: // This pretty simple file checks if the system is LITTLE_ENDIAN or BIG_ENDIAN
truelight@157: //  it does that by putting a 1 and a 0 in an array, and read it out as one
truelight@200: //  number. If it is 1, it is LITTLE_ENDIAN, if it is 256, it is BIG_ENDIAN
truelight@157: //
truelight@157: // After that it outputs the contents of an include files (endian.h)
truelight@157: //  that says or TTD_LITTLE_ENDIAN, or TTD_BIG_ENDIAN. Makefile takes
truelight@157: //  care of the real writing to the file.
truelight@157: 
TrueLight@1692: int main (int argc, char *argv[]) {
bjarni@2713: 	unsigned char EndianTest[2] = { 1, 0 };
bjarni@2719: 	int force_BE = 0, force_LE = 0, force_PREPROCESSOR = 0;
TrueLight@1692: 
bjarni@2713: 	if (argc > 1 && strcmp(argv[1], "BE") == 0)
bjarni@2713: 		force_BE = 1;
bjarni@2713: 	if (argc > 1 && strcmp(argv[1], "LE") == 0)
bjarni@2713: 		force_LE = 1;
bjarni@2719: 	if (argc > 1 && strcmp(argv[1], "PREPROCESSOR") == 0)
bjarni@2719: 		force_PREPROCESSOR = 1;
TrueLight@1692: 
bjarni@2713: 	printf("#ifndef ENDIAN_H\n#define ENDIAN_H\n");
truelight@157: 
bjarni@2713: 	if (force_LE == 1) {
bjarni@2713: 		printf("#define TTD_LITTLE_ENDIAN\n");
bjarni@2713: 	} else {
bjarni@2713: 		if (force_BE == 1) {
bjarni@2713: 			printf("#define TTD_BIG_ENDIAN\n");
bjarni@2713: 		} else {
bjarni@2719: 			if (force_PREPROCESSOR == 1) {
bjarni@2719: 				// adding support for universal binaries on OSX
bjarni@2719: 				// Universal binaries supports both PPC and x86
bjarni@2719: 				// If a compiler for OSX gets this setting, it will always pick the correct endian and no test is needed
bjarni@2719: 				printf("#ifdef __BIG_ENDIAN__\n");
bjarni@2719: 				printf("#define TTD_BIG_ENDIAN\n");
bjarni@2719: 				printf("#else\n");
bjarni@2713: 				printf("#define TTD_LITTLE_ENDIAN\n");
bjarni@2719: 				printf("#endif\n");
bjarni@2719: 			} else {
bjarni@2719: 				if ( *(short *) EndianTest == 1 )
bjarni@2719: 					printf("#define TTD_LITTLE_ENDIAN\n");
bjarni@2719: 				else
bjarni@2719: 					printf("#define TTD_BIG_ENDIAN\n");
bjarni@2719: 			}
bjarni@2713: 		}
bjarni@2713: 	}
bjarni@2713: 	printf("#endif\n");
truelight@157: 
bjarni@2713: 	return 0;
truelight@157: }