检查本机字节序方法

#define CPU_VENDOR_OS "本机版本信息"

int main(int argc, char ** argv)
{
    union
    {
        short s;
        char c[sizeof(short)];
    }un;

    un.s = 0x0102;
    printf("%s:",CPU_VENDOR_OS);
    if( sizeof(short) == 2 )
    {
        if( un.c[0] == 1 && un.c[1] == 2 )
        {
             printf("big-endian\n");
        }
        else if( un.c[0] == 2 && un.c[1] == 1 )
        {
             printf("little-endian\n");
        }
        else
        {
             printf("unknow\n");
        }
    }
    else
    {
         printf("sizeof(short) = %d\n ",sizeof(short));
    }
    exit(0);
}