/* Measure strlen 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/>.  */

#define TEST_MAIN

#ifndef WIDE

# define TEST_NAME "strnlen"

#else

# define TEST_NAME "wcsnlen"

#endif /* WIDE */

#include "bench-string.h"

#ifndef WIDE

# define STRNLEN strnlen

# define CHAR char

# define BIG_CHAR CHAR_MAX

# define MIDDLE_CHAR 127

# define SIMPLE_STRNLEN simple_strnlen

#else

# include <wchar.h>

# define STRNLEN wcsnlen

# define CHAR wchar_t

# define BIG_CHAR WCHAR_MAX

# define MIDDLE_CHAR 1121

# define SIMPLE_STRNLEN simple_wcsnlen

#endif /* WIDE */

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

size_t SIMPLE_STRNLEN (const CHAR *, size_t);

IMPL (SIMPLE_STRNLEN, 0)

IMPL (STRNLEN, 1)

size_t

SIMPLE_STRNLEN (const CHAR *s, size_t maxlen)

{

  size_t i;

  for (i = 0; i < maxlen && s[i]; ++i);

  return i;

}

static void

do_one_test (impl_t *impl, const CHAR *s, size_t maxlen, size_t exp_len)

{

  size_t len = CALL (impl, s, maxlen), i, iters = INNER_LOOP_ITERS;

  timing_t start, stop, cur;

  if (len != exp_len)

    {

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

	     len, exp_len);

      ret = 1;

      return;

    }

  TIMING_NOW (start);

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

    {

      CALL (impl, s, maxlen);

    }

  TIMING_NOW (stop);

  TIMING_DIFF (cur, start, stop);

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

}

static void

do_test (size_t align, size_t len, size_t maxlen, int max_char)

{

  size_t i;

  align &= 63;

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

    return;

  CHAR *buf = (CHAR *) (buf1);

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

    buf[align + i] = 1 + 7 * i % max_char;

  buf[align + len] = 0;

  printf ("Length %4zd, alignment %2zd:", len, align);

  FOR_EACH_IMPL (impl, 0)

    do_one_test (impl, (CHAR *) (buf + align), maxlen, MIN (len, maxlen));

  putchar ('\n');

}

int

test_main (void)

{

  size_t i;

  test_init ();

  printf ("%20s", "");

  FOR_EACH_IMPL (impl, 0)

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

  putchar ('\n');

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

    {

      do_test (0, i, i - 1, MIDDLE_CHAR);

      do_test (0, i, i, MIDDLE_CHAR);

      do_test (0, i, i + 1, MIDDLE_CHAR);

    }

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

    {

      do_test (i, i, i - 1, MIDDLE_CHAR);

      do_test (i, i, i, MIDDLE_CHAR);

      do_test (i, i, i + 1, MIDDLE_CHAR);

    }

  for (i = 2; i <= 10; ++i)

    {

      do_test (0, 1 << i, 5000, MIDDLE_CHAR);

      do_test (1, 1 << i, 5000, MIDDLE_CHAR);

    }

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

    do_test (0, i, 5000, BIG_CHAR);

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

    do_test (i, i, 5000, BIG_CHAR);

  for (i = 2; i <= 10; ++i)

    {

      do_test (0, 1 << i, 5000, BIG_CHAR);

      do_test (1, 1 << i, 5000, BIG_CHAR);

    }

  return ret;

}

#include <support/test-driver.c>