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
29static union {
30  char buf[MAX_LENGTH];
31  long long align_int;
32  long double align_fp;
33} u1, u2;
34
35main ()
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