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      1 #include <stdio.h>
      2 #include <arpa/inet.h>  /* for htons() etc.. */
      3 
      4 static char  tab[8];
      5 
      6 static void
      7 read4( int  o, unsigned val )
      8 {
      9     unsigned  v = htonl(val);
     10     unsigned  v2;
     11 
     12     tab[o+0] = (char)(v >> 24);
     13     tab[o+1] = (char)(v >> 16);
     14     tab[o+2] = (char)(v >> 8);
     15     tab[o+3] = (char)(v);
     16 
     17     printf( "read4: offset=%d value=%08x: ", o, val );
     18     fflush(stdout);
     19 
     20     v2 = *(unsigned*)(tab+o);
     21 
     22     if (v2 != val) {
     23         printf( "FAIL (%08x)\n", v2 );
     24     } else {
     25         printf( "ok\n" );
     26     }
     27 }
     28 
     29 static void
     30 writ4( int  o, unsigned val )
     31 {
     32     unsigned  v = htonl(val);
     33     unsigned  v2;
     34 
     35     printf( "writ4: offset=%d value=%08x: ", o, val );
     36     fflush(stdout);
     37 
     38     *(unsigned*)(tab+o) = v;
     39 
     40     v2 = ((unsigned)tab[o+0] << 24) |
     41          ((unsigned)tab[o+1] << 16) |
     42          ((unsigned)tab[o+2] << 8 ) |
     43          ((unsigned)tab[o+3]      );
     44 
     45     if (v2 != val) {
     46         printf( "FAIL (%08x)\n", v2 );
     47     } else {
     48         printf( "ok\n" );
     49     }
     50 }
     51 
     52 static void
     53 read2( int  o, unsigned val )
     54 {
     55     unsigned short v = htons(val);
     56     unsigned short v2;
     57 
     58     tab[o+0] = (char)(v >> 8);
     59     tab[o+1] = (char)(v);
     60 
     61     printf( "read2: offset=%d value=%08x: ", o, val );
     62     fflush(stdout);
     63 
     64     v2 = *(unsigned short*)(tab+o);
     65 
     66     if (v2 != val) {
     67         printf( "FAIL (%04x)\n", v2 );
     68     } else {
     69         printf( "ok\n" );
     70     }
     71 }
     72 
     73 static void
     74 writ2( int  o, unsigned val )
     75 {
     76     unsigned short v = htons(val);
     77     unsigned short v2;
     78 
     79     printf( "writ2: offset=%d value=%08x: ", o, val );
     80     fflush(stdout);
     81 
     82     *(unsigned short*)(tab+o) = v;
     83 
     84     v2 = ((unsigned)tab[o+0] << 8) |
     85          ((unsigned)tab[o+1]       );
     86 
     87     if (v2 != val) {
     88         printf( "FAIL (%08x)\n", v2 );
     89     } else {
     90         printf( "ok\n" );
     91     }
     92 }
     93 
     94 
     95 
     96 int  main(void)
     97 {
     98     read4( 0, 0x12345678 );
     99     writ4( 0, 0x12345678 );
    100     read4( 1, 0x12345678 );
    101     writ4( 1, 0x12345678 );
    102     read4( 2, 0x12345678 );
    103     writ4( 2, 0x12345678 );
    104     read4( 3, 0x12345678 );
    105     writ4( 3, 0x12345678 );
    106 
    107     read2( 0, 0x1234 );
    108     writ2( 0, 0x1234 );
    109     read2( 1, 0x1234 );
    110     writ2( 1, 0x1234 );
    111     read2( 2, 0x1234 );
    112     writ2( 2, 0x1234 );
    113     read2( 3, 0x1234 );
    114     writ2( 3, 0x1234 );
    115 
    116     return 0;
    117 }
    118