blob: 8b8923eb94340b7f965b0eda4eaff30d05907b79 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
/* Duff's device is legal C; test to make sure the compiler
doesn't complain about it.
Jason Thorpe <thorpej@wasabisystems.com>
Derived from the BSD Telnet Kerberos 4 checksum routine.
See also PR 5230. */
/* { dg-do run } */
/* { dg-options "-O2" } */
extern void abort (void);
extern void exit (int);
#if __INT_MAX__ >= 2147483647
/* At least 32-bit integers. */
typedef int type32;
#else
typedef long type32;
#endif
type32
cksum (const unsigned char *src, unsigned long size)
{
type32 ck = 0;
switch (size & 3)
{
while (size > 0)
{
case 0:
ck ^= (type32)*src++ << 24;
--size;
case 3:
ck ^= (type32)*src++ << 16;
--size;
case 2:
ck ^= (type32)*src++ << 8;
--size;
case 1:
ck ^= (type32)*src++;
--size;
}
}
return ck;
}
const char testpat[] = "The quick brown fox jumped over the lazy dog.";
int
main()
{
type32 ck;
ck = cksum ((const unsigned char *) testpat, sizeof (testpat));
if (ck != 925902908)
abort ();
exit (0);
}
|
