string/testcopy.c

   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).
   4
   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.
   9
  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.
  14
  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.  */
  19
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <malloc.h>
  24
  25 int
  26 main (argc, argv)
  27      int argc;
  28      char **argv;
  29 {
  30   char *mem, *memp;
  31   char *rand_mem;
  32   char *lo_around, *hi_around;
  33   int size, max_size;
  34   int src_off, dst_off;
  35   int i;
  36   int space_around = 10;
  37
  38   max_size = 256;
  39
  40   mem = malloc (max_size + 2 * max_size + 2 * space_around);
  41   rand_mem = malloc (max_size);
  42   lo_around = malloc (space_around);
  43   hi_around = malloc (space_around);
  44   memp = mem + space_around;
  45
  46   /* Fill RAND_MEM with random bytes, each non-zero.  */
  47   for (i = 0; i < max_size; i++)
  48     {
  49       int x;
  50       do
  51         x = random ();
  52       while (x == 0);
  53       rand_mem[i] = x;
  54     }
  55
  56   for (size = 0; size < max_size; size++)
  57     {
  58       printf("phase %d\n", size);
  59       for (src_off = 0; src_off <= 16; src_off++)
  60         {
  61           for (dst_off = 0; dst_off <= 16; dst_off++)
  62             {
  63               /* Put zero around the intended destination, to check
  64                  that it's not clobbered.  */
  65               for (i = 1; i < space_around; i++)
  66                 {
  67                   memp[dst_off - i] = 0;
  68                   memp[dst_off + size - 1 + i] = 0;
  69                 }
  70
  71               /* Fill the source area with known contents.  */
  72               for (i = 0; i < size; i++)
  73                 memp[src_off + i] = rand_mem[i];
  74
  75               /* Remember the contents around the destination area.
  76                  (It might not be what we wrote some lines above, since
  77                  the src area and the dst area overlap.)  */
  78               for (i = 1; i < space_around; i++)
  79                 {
  80                   lo_around[i] = memp[dst_off - i];
  81                   hi_around[i] = memp[dst_off + size - 1 + i];
  82                 }
  83
  84               memmove (memp + dst_off, memp + src_off, size);
  85
  86               /* Check that the destination area has the same
  87                  contents we wrote to the source area.  */
  88               for (i = 0; i < size; i++)
  89                 {
  90                   if (memp[dst_off + i] != rand_mem[i])
  91                     abort ();
  92                 }
  93
  94               /* Check that the area around the destination is not
  95                  clobbered.  */
  96               for (i = 1; i < space_around; i++)
  97                 {
  98                   if (memp[dst_off - i] != lo_around[i])
  99                     abort ();
 100                   if (memp[dst_off + size - 1 + i] != hi_around[i])
 101                     abort ();
 102                 }
 103             }
 104         }
 105     }
 106
 107   puts ("Test succeeded.");
 108
 109   return 0;
 110 }