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[glibc.git] / string / testcopy.c
blob030b229794944f29332be97d97f5e90caec5188b
1 /* Copyright (C) 1990, 1991, 1992, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Torbjorn Granlund (tege@sics.se).
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #include <stdlib.h>
21 #include <stdio.h>
22 #include <string.h>
23 #include <malloc.h>
25 int
26 main (void)
28 char *mem, *memp;
29 char *rand_mem;
30 char *lo_around, *hi_around;
31 int size, max_size;
32 int src_off, dst_off;
33 int i;
34 int space_around = 10;
36 max_size = 256;
38 mem = malloc (max_size + 2 * max_size + 2 * space_around);
39 rand_mem = malloc (max_size);
40 lo_around = malloc (space_around);
41 hi_around = malloc (space_around);
42 memp = mem + space_around;
44 /* Fill RAND_MEM with random bytes, each non-zero. */
45 for (i = 0; i < max_size; i++)
47 int x;
49 x = random ();
50 while (x == 0);
51 rand_mem[i] = x;
54 for (size = 0; size < max_size; size++)
56 printf("phase %d\n", size);
57 for (src_off = 0; src_off <= 16; src_off++)
59 for (dst_off = 0; dst_off <= 16; dst_off++)
61 /* Put zero around the intended destination, to check
62 that it's not clobbered. */
63 for (i = 1; i < space_around; i++)
65 memp[dst_off - i] = 0;
66 memp[dst_off + size - 1 + i] = 0;
69 /* Fill the source area with known contents. */
70 for (i = 0; i < size; i++)
71 memp[src_off + i] = rand_mem[i];
73 /* Remember the contents around the destination area.
74 (It might not be what we wrote some lines above, since
75 the src area and the dst area overlap.) */
76 for (i = 1; i < space_around; i++)
78 lo_around[i] = memp[dst_off - i];
79 hi_around[i] = memp[dst_off + size - 1 + i];
82 memmove (memp + dst_off, memp + src_off, size);
84 /* Check that the destination area has the same
85 contents we wrote to the source area. */
86 for (i = 0; i < size; i++)
88 if (memp[dst_off + i] != rand_mem[i])
89 abort ();
92 /* Check that the area around the destination is not
93 clobbered. */
94 for (i = 1; i < space_around; i++)
96 if (memp[dst_off - i] != lo_around[i])
97 abort ();
98 if (memp[dst_off + size - 1 + i] != hi_around[i])
99 abort ();
105 puts ("Test succeeded.");
107 return 0;