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  1. /* A minor test-program for memmove.
  2.    Copyright (C) 2005 Axis Communications.
  3.    All rights reserved.
  4.  
  5.    Redistribution and use in source and binary forms, with or without
  6.    modification, are permitted provided that the following conditions
  7.    are met:
  8.  
  9.    1. Redistributions of source code must retain the above copyright
  10.       notice, this list of conditions and the following disclaimer.
  11.  
  12.    2. Neither the name of Axis Communications nor the names of its
  13.       contributors may be used to endorse or promote products derived
  14.       from this software without specific prior written permission.
  15.  
  16.    THIS SOFTWARE IS PROVIDED BY AXIS COMMUNICATIONS AND ITS CONTRIBUTORS
  17.    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18.    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19.    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AXIS
  20.    COMMUNICATIONS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  21.    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22.    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23.    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24.    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  25.    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  26.    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27.    POSSIBILITY OF SUCH DAMAGE.  */
  28.  
  29. /* Test moves of 0..MAX bytes; overlapping-src-higher,
  30.    overlapping-src-lower and non-overlapping.  The overlap varies with
  31.    1..N where N is the size moved.  This means an order of MAX**2
  32.    iterations.  The size of an octet may seem appropriate for MAX and
  33.    makes an upper limit for simple testing.  For the CRIS simulator,
  34.    making this 256 added 90s to the test-run (2GHz P4) while 64 (4s) was
  35.    enough to spot the bugs that had crept in, hence the number chosen.  */
  36. #define MAX 64
  37.  
  38. #include <stdio.h>
  39. #include <stdlib.h>
  40. #include <string.h>
  41.  
  42. #define TOO_MANY_ERRORS 11
  43. int errors = 0;
  44.  
  45. #define DEBUGP                                  \
  46.  if (errors == TOO_MANY_ERRORS)                 \
  47.    printf ("Further errors omitted\n");         \
  48.  else if (errors < TOO_MANY_ERRORS)             \
  49.    printf
  50.  
  51. /* A safe target-independent memmove.  */
  52.  
  53. void
  54. mymemmove (unsigned char *dest, unsigned char *src, size_t n)
  55. {
  56.   size_t i;
  57.  
  58.   if ((src <= dest && src + n <= dest)
  59.       || src >= dest)
  60.     while (n-- > 0)
  61.       *dest++ = *src++;
  62.   else
  63.     {
  64.       dest += n;
  65.       src += n;
  66.       while (n-- > 0)
  67.         *--dest = *--src;
  68.     }
  69. }
  70.  
  71. /* It's either the noinline attribute or forcing the test framework to
  72.    pass -fno-builtin-memmove.  */
  73. void
  74. xmemmove (unsigned char *dest, unsigned char *src, size_t n)
  75.      __attribute__ ((__noinline__));
  76.  
  77. void
  78. xmemmove (unsigned char *dest, unsigned char *src, size_t n)
  79. {
  80.   void *retp;
  81.   retp = memmove (dest, src, n);
  82.  
  83.   if (retp != dest)
  84.     {
  85.       errors++;
  86.       DEBUGP ("memmove of n bytes returned %p instead of dest=%p\n",
  87.               retp, dest);
  88.     }
  89. }
  90.  
  91.  
  92. /* Fill the array with something we can associate with a position, but
  93.    not exactly the same as the position index.  */
  94.  
  95. void
  96. fill (unsigned char dest[MAX*3])
  97. {
  98.   size_t i;
  99.   for (i = 0; i < MAX*3; i++)
  100.     dest[i] = (10 + i) % MAX;
  101. }
  102.  
  103. int
  104. main (void)
  105. {
  106.   size_t i;
  107.   int errors = 0;
  108.  
  109.   /* Leave some room before and after the area tested, so we can detect
  110.      overwrites of up to N bytes, N being the amount tested.  If you
  111.      want to test using valgrind, make these malloced instead.  */
  112.   unsigned char from_test[MAX*3];
  113.   unsigned char to_test[MAX*3];
  114.   unsigned char from_known[MAX*3];
  115.   unsigned char to_known[MAX*3];
  116.  
  117.   /* Non-overlap.  */
  118.   for (i = 0; i < MAX; i++)
  119.     {
  120.       /* Do the memmove first before setting the known array, so we know
  121.          it didn't change any of the known array.  */
  122.       fill (from_test);
  123.       fill (to_test);
  124.       xmemmove (to_test + MAX, 1 + from_test + MAX, i);
  125.  
  126.       fill (from_known);
  127.       fill (to_known);
  128.       mymemmove (to_known + MAX, 1 + from_known + MAX, i);
  129.  
  130.       if (memcmp (to_known, to_test, sizeof (to_known)) != 0)
  131.         {
  132.           errors++;
  133.           DEBUGP ("memmove failed non-overlap test for %d bytes\n", i);
  134.         }
  135.     }
  136.  
  137.   /* Overlap-from-before.  */
  138.   for (i = 0; i < MAX; i++)
  139.     {
  140.       size_t j;
  141.       for (j = 0; j < i; j++)
  142.         {
  143.           fill (to_test);
  144.           xmemmove (to_test + MAX * 2 - i, to_test + MAX * 2 - i - j, i);
  145.  
  146.           fill (to_known);
  147.           mymemmove (to_known + MAX * 2 - i, to_known + MAX * 2 - i - j, i);
  148.  
  149.           if (memcmp (to_known, to_test, sizeof (to_known)) != 0)
  150.             {
  151.               errors++;
  152.               DEBUGP ("memmove failed for %d bytes,"
  153.                       " with src %d bytes before dest\n",
  154.                       i, j);
  155.             }
  156.         }
  157.     }
  158.  
  159.   /* Overlap-from-after.  */
  160.   for (i = 0; i < MAX; i++)
  161.     {
  162.       size_t j;
  163.       for (j = 0; j < i; j++)
  164.         {
  165.           fill (to_test);
  166.           xmemmove (to_test + MAX, to_test + MAX + j, i);
  167.  
  168.           fill (to_known);
  169.           mymemmove (to_known + MAX, to_known + MAX + j, i);
  170.  
  171.           if (memcmp (to_known, to_test, sizeof (to_known)) != 0)
  172.             {
  173.               errors++;
  174.               DEBUGP ("memmove failed when moving %d bytes,"
  175.                       " with src %d bytes after dest\n",
  176.                       i, j);
  177.             }
  178.         }
  179.     }
  180.  
  181. printf("%s finished\n", __FILE__);
  182.  
  183.   if (errors != 0)
  184.     abort ();
  185.   exit (0);
  186. }