/*
 * Copyright (c) 2011 ARM Ltd
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the company may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>

#ifndef BUFF_SIZE
#define BUFF_SIZE 1024
#endif

#ifndef START_COPY
#define START_COPY 256
#endif

#ifndef MAX_BLOCK_SIZE
#define MAX_BLOCK_SIZE 128
#endif

#ifndef MAX_OFFSET
#define MAX_OFFSET 3
#endif

#if (START_COPY + MAX_OFFSET + MAX_BLOCK_SIZE >= BUFF_SIZE)
#error "Buffer overrun: START_COPY + MAX_OFFSET + MAX_BLOCK_SIZE >= BUFF_SIZE."
#endif

#define TOO_MANY_ERRORS 11
int errors = 0;

void
print_error (char const* msg, ...)
{   
  errors++;
  if (errors == TOO_MANY_ERRORS)
    {
      fprintf (stderr, "Too many errors.\n");
    }
  else if (errors < TOO_MANY_ERRORS)
    {
      va_list ap;
      va_start (ap, msg);
      vfprintf (stderr, msg, ap);
      va_end (ap);
    }
  else
    {
      /* Further errors omitted.  */
    }
}

int
main (void)
{
  /* Allocate buffers to read and write from.  */
  char src[BUFF_SIZE], dest[BUFF_SIZE], backup_src[BUFF_SIZE];

  /* Fill the source buffer with non-null values, reproducable random data.  */
  srand (1539);
  int i;
  unsigned j;
  unsigned sa;
  unsigned da;
  unsigned n;
  for (i = 0; i < BUFF_SIZE; i++)
    {
      src[i] = (char)rand () | 1;
      backup_src[i] = src[i];
    }

  /* Make calls to memcpy with block sizes ranging between 1 and
     MAX_BLOCK_SIZE bytes, aligned and misaligned source and destination.  */
  for (sa = 0; sa <= MAX_OFFSET; sa++)
    for (da = 0; da <= MAX_OFFSET; da++)
      for (n = 1; n <= MAX_BLOCK_SIZE; n++)
        {
          printf (".");
          /* Zero dest so we can check it properly after the copying.  */
          for (j = 0; j < BUFF_SIZE; j++)
            dest[j] = 0;
          
          void *ret = memcpy (dest + START_COPY + da, src + sa, n);
          
          /* Check return value.  */
          if (ret != (dest + START_COPY + da))
            print_error ("\nFailed: wrong return value in memcpy of %u bytes "
                         "with src_align %u and dst_align %u. "
                         "Return value and dest should be the same"
                         "(ret is %p, dest is %p)\n",
                         n, sa, da, ret, dest + START_COPY + da);
          
          /* Check that content of the destination buffer
             is the same as the source buffer, and
             memory outside destination buffer is not modified.  */
          for (j = 0; j < BUFF_SIZE; j++)
            if (j < START_COPY + da)
              {
                if (dest[j] != 0)
                  print_error ("\nFailed: after memcpy of %u bytes "
                               "with src_align %u and dst_align %u, "
                               "byte %u before the start of dest is not 0.\n",
                               n, sa, da, START_COPY - j);
              }
            else if (j < START_COPY + da + n)
              {
                i = j - START_COPY - da;
                if (dest[j] != (src + sa)[i])
                  print_error ("\nFailed: after memcpy of %u bytes "
                               "with src_align %u and dst_align %u, "
                               "byte %u in dest and src are not the same.\n",
                               n, sa, da, i);
              }
            else if (dest[j] != 0)
              {
                print_error ("\nFailed: after memcpy of %u bytes "
                             "with src_align %u and dst_align %u, "
                             "byte %u after the end of dest is not 0.\n",
                             n, sa, da, j - START_COPY - da - n);
              }

          /* Check src is not modified.  */
          for (j = 0; j < BUFF_SIZE; j++)
            if (src[i] != backup_src[i])
              print_error ("\nFailed: after memcpy of %u bytes "
                           "with src_align %u and dst_align %u, "
                           "byte %u of src is modified.\n",
                           n, sa, da, j);
        }

  printf ("\n");
  if (errors != 0)
    abort ();

  exit (0);
}
