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109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/* Copyright (C) 1990-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <support/support.h>
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static int
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do_test (void)
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{
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char *mem, *memp;
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char *rand_mem;
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char *lo_around, *hi_around;
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int size, max_size;
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int src_off, dst_off;
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int i;
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int space_around = 10;
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max_size = 256;
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mem = xmalloc (max_size + 2 * max_size + 2 * space_around);
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rand_mem = xmalloc (max_size);
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lo_around = xmalloc (space_around);
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hi_around = xmalloc (space_around);
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memp = mem + space_around;
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/* Fill RAND_MEM with random bytes, each non-zero. */
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for (i = 0; i < max_size; i++)
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{
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int x;
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do
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x = random ();
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while (x == 0);
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rand_mem[i] = x;
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}
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for (size = 0; size < max_size; size++)
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{
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printf("phase %d\n", size);
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for (src_off = 0; src_off <= 16; src_off++)
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{
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for (dst_off = 0; dst_off <= 16; dst_off++)
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{
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/* Put zero around the intended destination, to check
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that it's not clobbered. */
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for (i = 1; i < space_around; i++)
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{
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memp[dst_off - i] = 0;
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memp[dst_off + size - 1 + i] = 0;
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}
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/* Fill the source area with known contents. */
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for (i = 0; i < size; i++)
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memp[src_off + i] = rand_mem[i];
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/* Remember the contents around the destination area.
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(It might not be what we wrote some lines above, since
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the src area and the dst area overlap.) */
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for (i = 1; i < space_around; i++)
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{
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lo_around[i] = memp[dst_off - i];
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hi_around[i] = memp[dst_off + size - 1 + i];
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}
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memmove (memp + dst_off, memp + src_off, size);
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/* Check that the destination area has the same
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contents we wrote to the source area. */
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for (i = 0; i < size; i++)
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{
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if (memp[dst_off + i] != rand_mem[i])
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abort ();
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}
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/* Check that the area around the destination is not
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clobbered. */
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for (i = 1; i < space_around; i++)
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{
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if (memp[dst_off - i] != lo_around[i])
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abort ();
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if (memp[dst_off + size - 1 + i] != hi_around[i])
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abort ();
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}
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}
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}
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}
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puts ("Test succeeded.");
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return 0;
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}
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#include <support/test-driver.c>
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