1 #include    "unp.h" 2  3 int 4 main(int argc, char **argv) 5 { 6     union { 7       short  s; 8       char   c[sizeof(short)]; 9     } un;10 11     un.s = 0x0102;12     printf("%s: ", CPU_VENDOR_OS);13     if (sizeof(short) == 2) {14         if (un.c[0] == 1 && un.c[1] == 2)15             printf("big-endian\n");16         else if (un.c[0] == 2 && un.c[1] == 1)17             printf("little-endian\n");18         else19             printf("unknown\n");20     } else21         printf("sizeof(short) = %d\n", sizeof(short));22 23     exit(0);24 }