大端-小端对齐判定函数

大端-小端对齐判定方法

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int main(int argc, char** argv) {
	(void)argc;
	(void)argv;
	union {
		short s;
		char c[sizeof(short)];
	}un;
	un.s = 0x0102;
	if(sizeof(short)!=2) {
		printf("sizeof(short)=%d\n", sizeof(short));
	} else {
		if(1== un.c[0] && 2==un.c[1]) {
			printf("Big end\n");
		} else if(2==un.c[0] && 1==un.c[1]) {
			printf("Little end\n");
		} else {
			printf("unknown \n");
		}
	}
	return 0;
}