Find out endianess in C

i386 is little-endian.
m68k is big-endian (most significant byte comes first)

int is_big_endian(void)
{
	union {
		uint32_t i;
		uint8_t c[4];
	} e = { 0x01000000 };
	return e.c[0];
}

int main(void)
{
	printf("System is %s-endian.\n", is_big_endian()?"big":"little");
	return 0;
}