src/endian_check.cpp
author peter1138
Tue, 22 Jan 2008 07:27:06 +0000
changeset 8374 7a1b6c89cb89
parent 7321 f91bdca345e8
child 9543 a60fb4bacc66
permissions -rw-r--r--
(svn r11940) -Codechange: Store short filename once per open file instead of once per sprite cache entry. Not all file types need this, but most of the time no sprite cache entry needed it either.
/* $Id$ */

/** @file endian_check.cpp
 * 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. */

#include <stdio.h>
#include <string.h>

/**
 * Main call of the endian_check program
 * @param argc argument count
 * @param argv arguments themselves
 * @return exit code
 */
int main (int argc, char *argv[])
{
	unsigned char endian_test[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) {
		/* 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*)endian_test == 1 ) {
		printf("#define TTD_LITTLE_ENDIAN\n");
	} else {
		printf("#define TTD_BIG_ENDIAN\n");
	}
	printf("#endif\n");

	return 0;
}