/* Measure strncpy functions.

   Copyright (C) 2013-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifdef WIDE

# include <wchar.h>

# define CHAR wchar_t

# define UCHAR wchar_t

# define BIG_CHAR WCHAR_MAX

# define SMALL_CHAR 1273

# define MEMCMP wmemcmp

# define MEMSET wmemset

# define STRNLEN wcsnlen

#else

# define CHAR char

# define UCHAR unsigned char

# define BIG_CHAR CHAR_MAX

# define SMALL_CHAR 127

# define MEMCMP memcmp

# define MEMSET memset

# define STRNLEN strnlen

#endif /* !WIDE */

#ifndef STRNCPY_RESULT

# define STRNCPY_RESULT(dst, len, n) dst

# define TEST_MAIN

# ifndef WIDE

#  define TEST_NAME "strncpy"

# else

#  define TEST_NAME "wcsncpy"

# endif /* WIDE */

# include "bench-string.h"

# ifndef WIDE

#  define SIMPLE_STRNCPY simple_strncpy

#  define STUPID_STRNCPY stupid_strncpy

#  define STRNCPY strncpy

# else

#  define SIMPLE_STRNCPY simple_wcsncpy

#  define STUPID_STRNCPY stupid_wcsncpy

#  define STRNCPY wcsncpy

# endif /* WIDE */

CHAR *SIMPLE_STRNCPY (CHAR *, const CHAR *, size_t);

CHAR *STUPID_STRNCPY (CHAR *, const CHAR *, size_t);

IMPL (STUPID_STRNCPY, 0)

IMPL (SIMPLE_STRNCPY, 0)

IMPL (STRNCPY, 1)

CHAR *

SIMPLE_STRNCPY (CHAR *dst, const CHAR *src, size_t n)

{

  CHAR *ret = dst;

  while (n--)

    if ((*dst++ = *src++) == '\0')

      {

	while (n--)

	  *dst++ = '\0';

	return ret;

      }

  return ret;

}

CHAR *

STUPID_STRNCPY (CHAR *dst, const CHAR *src, size_t n)

{

  size_t nc = STRNLEN (src, n);

  size_t i;

  for (i = 0; i < nc; ++i)

    dst[i] = src[i];

  for (; i < n; ++i)

    dst[i] = '\0';

  return dst;

}

#endif /* !STRNCPY_RESULT */

typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t);

static void

do_one_test (impl_t *impl, CHAR *dst, const CHAR *src, size_t len, size_t n)

{

  size_t i, iters = INNER_LOOP_ITERS;

  timing_t start, stop, cur;

  if (CALL (impl, dst, src, n) != STRNCPY_RESULT (dst, len, n))

    {

      error (0, 0, "Wrong result in function %s %p %p", impl->name,

	     CALL (impl, dst, src, n), dst);

      ret = 1;

      return;

    }

  if (memcmp (dst, src, (len > n ? n : len) * sizeof (CHAR)) != 0)

    {

      error (0, 0, "Wrong result in function %s", impl->name);

      ret = 1;

      return;

    }

  if (n > len)

    {

      size_t i;

      for (i = len; i < n; ++i)

	if (dst [i] != '\0')

	  {

	    error (0, 0, "Wrong result in function %s", impl->name);

	    ret = 1;

	    return;

	  }

    }

  TIMING_NOW (start);

  for (i = 0; i < iters; ++i)

    {

      CALL (impl, dst, src, n);

    }

  TIMING_NOW (stop);

  TIMING_DIFF (cur, start, stop);

  TIMING_PRINT_MEAN ((double) cur, (double) iters);

}

static void

do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)

{

  size_t i;

  CHAR *s1, *s2;

/* For wcsncpy: align1 and align2 here mean alignment not in bytes,

   but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t)).  */

  align1 &= 7;

  if ((align1 + len) * sizeof (CHAR) >= page_size)

    return;

  align2 &= 7;

  if ((align2 + len) * sizeof (CHAR) >= page_size)

    return;

  s1 = (CHAR *) (buf1) + align1;

  s2 = (CHAR *) (buf2) + align2;

  for (i = 0; i < len; ++i)

    s1[i] = 32 + 23 * i % (max_char - 32);

  s1[len] = 0;

  for (i = len + 1; (i + align1) * sizeof (CHAR) < page_size && i < len + 64;

       ++i)

    s1[i] = 32 + 32 * i % (max_char - 32);

  printf ("Length %4zd, n %4zd, alignment %2zd/%2zd:", len, n, align1, align2);

  FOR_EACH_IMPL (impl, 0)

    do_one_test (impl, s2, s1, len, n);

  putchar ('\n');

}

static int

test_main (void)

{

  size_t i;

  test_init ();

  printf ("%28s", "");

  FOR_EACH_IMPL (impl, 0)

    printf ("\t%s", impl->name);

  putchar ('\n');

  for (i = 1; i < 8; ++i)

    {

      do_test (i, i, 16, 16, SMALL_CHAR);

      do_test (i, i, 16, 16, BIG_CHAR);

      do_test (i, 2 * i, 16, 16, SMALL_CHAR);

      do_test (2 * i, i, 16, 16, BIG_CHAR);

      do_test (8 - i, 2 * i, 1 << i, 2 << i, SMALL_CHAR);

      do_test (2 * i, 8 - i, 2 << i, 1 << i, SMALL_CHAR);

      do_test (8 - i, 2 * i, 1 << i, 2 << i, BIG_CHAR);

      do_test (2 * i, 8 - i, 2 << i, 1 << i, BIG_CHAR);

    }

  for (i = 1; i < 8; ++i)

    {

      do_test (0, 0, 4 << i, 8 << i, SMALL_CHAR);

      do_test (0, 0, 16 << i, 8 << i, SMALL_CHAR);

      do_test (8 - i, 2 * i, 4 << i, 8 << i, SMALL_CHAR);

      do_test (8 - i, 2 * i, 16 << i, 8 << i, SMALL_CHAR);

    }

  return ret;

}

#include <support/test-driver.c>