1 /* Copyright (C) 2002  Free Software Foundation.
2 
3    Test memcpy with various combinations of pointer alignments and lengths to
4    make sure any optimizations in the library are correct.
5 
6    Written by Michael Meissner, March 9, 2002.  */
7 
8 #include <string.h>
9 
10 #ifndef MAX_OFFSET
11 #define MAX_OFFSET (sizeof (long long))
12 #endif
13 
14 #ifndef MAX_COPY
15 #define MAX_COPY (10 * sizeof (long long))
16 #endif
17 
18 #ifndef MAX_EXTRA
19 #define MAX_EXTRA (sizeof (long long))
20 #endif
21 
22 #define MAX_LENGTH (MAX_OFFSET + MAX_COPY + MAX_EXTRA)
23 
24 
25 /* Use a sequence length that is not divisible by two, to make it more
26    likely to detect when words are mixed up.  */
27 #define SEQUENCE_LENGTH 31
28 
29 static union {
30   char buf[MAX_LENGTH];
31   long long align_int;
32   long double align_fp;
33 } u1, u2;
34 
35 main ()
36 {
37   int off1, off2, len, i;
38   char *p, *q, c;
39 
40   for (off1 = 0; off1 < MAX_OFFSET; off1++)
41     for (off2 = 0; off2 < MAX_OFFSET; off2++)
42       for (len = 1; len < MAX_COPY; len++)
43 	{
44 	  for (i = 0, c = 'A'; i < MAX_LENGTH; i++, c++)
45 	    {
46 	      u1.buf[i] = 'a';
47 	      if (c >= 'A' + SEQUENCE_LENGTH)
48 		c = 'A';
49 	      u2.buf[i] = c;
50 	    }
51 
52 	  p = memcpy (u1.buf + off1, u2.buf + off2, len);
53 	  if (p != u1.buf + off1)
54 	    abort ();
55 
56 	  q = u1.buf;
57 	  for (i = 0; i < off1; i++, q++)
58 	    if (*q != 'a')
59 	      abort ();
60 
61 	  for (i = 0, c = 'A' + off2; i < len; i++, q++, c++)
62 	    {
63 	      if (c >= 'A' + SEQUENCE_LENGTH)
64 		c = 'A';
65 	      if (*q != c)
66 		abort ();
67 	    }
68 
69 	  for (i = 0; i < MAX_EXTRA; i++, q++)
70 	    if (*q != 'a')
71 	      abort ();
72 	}
73 
74   exit (0);
75 }
76