tron@2186: /* $Id$ */
tron@2186: 
belugas@6451: /** @file endian_check.cpp
belugas@6451:  * This pretty simple file checks if the system is LITTLE_ENDIAN or BIG_ENDIAN
belugas@6451:  *  it does that by putting a 1 and a 0 in an array, and read it out as one
belugas@6451:  *  number. If it is 1, it is LITTLE_ENDIAN, if it is 256, it is BIG_ENDIAN
belugas@6451:  *
belugas@6451:  * After that it outputs the contents of an include files (endian.h)
belugas@6451:  *  that says or TTD_LITTLE_ENDIAN, or TTD_BIG_ENDIAN. Makefile takes
belugas@6451:  *  care of the real writing to the file. */
belugas@6451: 
truelight@157: #include <stdio.h>
rubidium@5838: #include <string.h>
truelight@157: 
celestar@9908: /** Main call of the endian_check program
celestar@9908:  * @param argc argument count
celestar@9908:  * @param argv arguments themselves
celestar@9908:  * @return exit code */
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) {
belugas@6451: 				/** adding support for universal binaries on OSX
belugas@6451: 				 * Universal binaries supports both PPC and x86
belugas@6451: 				 * 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: }