test_aligned.c revision e16cb84e2324f05334d18dcf5956f20f44262b62 
1#include <stdio.h>
2#include <arpa/inet.h>  /* for htons() etc.. */
3
4static char  tab[8];
5
6static void
7read4( 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
29static void
30writ4( 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
52static void
53read2( 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
73static void
74writ2( 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
96int  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