/* Test strlen functions.

   Copyright (C) 1999-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Written by Jakub Jelinek <jakub@redhat.com>, 1999.

   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 "test-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);

  if (len != exp_len)

    {

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

	     len, exp_len);

      ret = 1;

      return;

    }

}

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 + 11111 * i % max_char;

  buf[align + len] = 0;

  FOR_EACH_IMPL (impl, 0)

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

}

static void

do_random_tests (void)

{

  size_t i, j, n, align, len;

  CHAR *p = (CHAR *) (buf1 + page_size - 512 * sizeof (CHAR));

  for (n = 0; n < ITERATIONS; n++)

    {

      align = random () & 15;

      len = random () & 511;

      if (len + align > 510)

	len = 511 - align - (random () & 7);

      j = len + align + 64;

      if (j > 512)

	j = 512;

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

	{

	  if (i == len + align)

	    p[i] = 0;

	  else

	    {

	      p[i] = random () & 255;

	      if (i >= align && i < len + align && !p[i])

		p[i] = (random () & 127) + 1;

	    }

	}

      FOR_EACH_IMPL (impl, 1)

	{

	  if (len > 0

	      && CALL (impl, (CHAR *) (p + align), len - 1) != len - 1)

	    {

	      error (0, 0, "Iteration %zd (limited) - wrong result in function %s (%zd) %zd != %zd, p %p",

		     n, impl->name, align,

		     CALL (impl, (CHAR *) (p + align), len - 1), len - 1, p);

	      ret = 1;

	    }

	  if (CALL (impl, (CHAR *) (p + align), len) != len)

	    {

	      error (0, 0, "Iteration %zd (exact) - wrong result in function %s (%zd) %zd != %zd, p %p",

		     n, impl->name, align,

		     CALL (impl, (CHAR *) (p + align), len), len, p);

	      ret = 1;

	    }

	  if (CALL (impl, (CHAR *) (p + align), len + 1) != len)

	    {

	      error (0, 0, "Iteration %zd (long) - wrong result in function %s (%zd) %zd != %zd, p %p",

		     n, impl->name, align,

		     CALL (impl, (CHAR *) (p + align), len + 1), len, p);

	      ret = 1;

	    }

	}

    }

}

/* Tests meant to unveil fail on implementation that does not access bytes

   around the page boundary accordingly.  */

static void

do_page_tests (void)

{

  size_t i, exp_len, start_offset, offset;

  /* Calculate the null character offset.  */

  size_t last_offset = (page_size / sizeof (CHAR)) - 1;

  CHAR *s = (CHAR *) buf2;

  memset (s, 65, (last_offset - 1));

  s[last_offset] = 0;

  /* Place short strings ending at page boundary.  */

  offset = last_offset;

  for (i = 0; i < 128; i++)

    {

      /* Decrease offset to stress several sizes and alignments.  */

      offset--;

      exp_len = last_offset - offset;

      FOR_EACH_IMPL (impl, 0)

        {

          /* Varies maxlen value to cover the cases where it is:

               - larger than length;

               - slightly greater than length;

               - equal to length;

               - slightly less than length.  */

          do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);

          do_one_test (impl, (CHAR *) (s + offset), exp_len + 1, exp_len);

          do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);

          if (exp_len > 0)

            do_one_test (impl, (CHAR *) (s + offset), exp_len - 1, exp_len - 1);

        }

    }

  /* Place long strings ending at page boundary.  */

  start_offset = (last_offset + 1) / 2;

  for (i = 0; i < 64; ++i)

    {

      /* Increase offset to stress several alignments.  */

      offset = start_offset + i;

      if (offset >= (last_offset + 1))

        break;

      exp_len = last_offset - offset;

      FOR_EACH_IMPL (impl, 0)

        {

          /* Checks only for maxlen much larger than length because smaller

             values are already covered in do_random_tests function.  */

          do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);

        }

    }

}

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);

    }

  do_random_tests ();

  do_page_tests ();

  return ret;

}

#include <support/test-driver.c>