Winsock 入门 判读主机字节序 示例

 

#include <stdio.h>

union endian_u
{
    /*最大成员的长度就是联合成员的长度。联合可以在定义时直接进行初始化，但这个初始化必须是联合第一个成员的类型，所以把unsigned short sval放在第一个成员的原因*/
    unsigned short sval;
    unsigned char cval[2];
};

int main(int argc, char *argv[])
{
    char *info = "unknow endian";
    union endian_u t = { 0x1234 };

    if (t.cval[0] == 0x12 && t.cval[1] == 0x34)
        info = "big-endian";
    else if (t.cval[0] == 0x34 && t.cval[1] == 0x12)
        info = "little-endian";

    printf("host is %s.\n", info);

    return 0;
}