/* Measure strsep 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

#define TEST_NAME "strsep"

#include "bench-string.h"

char *

simple_strsep (char **s1, char *s2)

{

  char *begin;

  char *s;

  size_t j = 0;

  begin = *s1;

  s = begin;

  if (begin == NULL)

    return NULL;

  ssize_t s2len = strlen (s2);

  while (*s)

    {

      for (j = 0; j < s2len; j++)

	{

	  if (*s == s2[j])

	    {

	      s[0] = '\0';

	      *s1 = s + 1;

	      return begin;

	    }

	}

      s++;

    }

  *s1 = NULL;

  return begin;

}

char *

oldstrsep (char **stringp, const char *delim)

{

  char *begin, *end;

  begin = *stringp;

  if (begin == NULL)

    return NULL;

  /* A frequent case is when the delimiter string contains only one

     character.  Here we don't need to call the expensive `strpbrk'

     function and instead work using `strchr'.  */

  if (delim[0] == '\0' || delim[1] == '\0')

    {

      char ch = delim[0];

      if (ch == '\0')

	end = NULL;

      else

	{

	  if (*begin == ch)

	    end = begin;

	  else if (*begin == '\0')

	    end = NULL;

	  else

	    end = strchr (begin + 1, ch);

	}

    }

  else

    /* Find the end of the token.  */

    end = strpbrk (begin, delim);

  if (end)

    {

      /* Terminate the token and set *STRINGP past NUL character.  */

      *end++ = '\0';

      *stringp = end;

    }

  else

    /* No more delimiters; this is the last token.  */

    *stringp = NULL;

  return begin;

}

typedef char *(*proto_t) (const char **, const char *);

IMPL (simple_strsep, 0)

IMPL (strsep, 1)

IMPL (oldstrsep, 2)

static void

do_one_test (impl_t * impl, const char *s1, const char *s2)

{

  size_t i, iters = INNER_LOOP_ITERS;

  timing_t start, stop, cur;

  TIMING_NOW (start);

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

    {

      const char *s1a = s1;

      CALL (impl, &s1a, s2);

      if (s1a != NULL)

	((char*)s1a)[-1] = '1';

    }

  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 len1, size_t len2, int fail)

{

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

  /* Search for a delimiter in a string containing mostly '0', so don't

     use '0' as a delimiter.  */

  static const char d[] = "123456789abcdefg";

#define dl (sizeof (d) - 1)

  char *ss2 = s2;

  for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)

    {

      size_t t = l > dl ? dl : l;

      ss2 = mempcpy (ss2, d, t);

    }

  s2[len2] = '\0';

  printf ("Length %4zd/%zd, alignment %2zd/%2zd, %s:",

	  len1, len2, align1, align2, fail ? "fail" : "found");

  FOR_EACH_IMPL (impl, 0)

  {

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

    memset (s1, '0', len1);

    if (!fail)

      s1[len1 / 2] = '1';

    s1[len1] = '\0';

    do_one_test (impl, s1, s2);

  }

  putchar ('\n');

}

static int

test_main (void)

{

  test_init ();

  printf ("%23s", "");

  FOR_EACH_IMPL (impl, 0)

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

  putchar ('\n');

  for (size_t klen = 2; klen < 32; ++klen)

    for (size_t hlen = 4 * klen; hlen < 8 * klen; hlen += klen)

      {

	do_test (0, 0, hlen, klen, 0);

	do_test (0, 0, hlen, klen, 1);

	do_test (0, 3, hlen, klen, 0);

	do_test (0, 3, hlen, klen, 1);

	do_test (0, 9, hlen, klen, 0);

	do_test (0, 9, hlen, klen, 1);

	do_test (0, 15, hlen, klen, 0);

	do_test (0, 15, hlen, klen, 1);

	do_test (3, 0, hlen, klen, 0);

	do_test (3, 0, hlen, klen, 1);

	do_test (3, 3, hlen, klen, 0);

	do_test (3, 3, hlen, klen, 1);

	do_test (3, 9, hlen, klen, 0);

	do_test (3, 9, hlen, klen, 1);

	do_test (3, 15, hlen, klen, 0);

	do_test (3, 15, hlen, klen, 1);

	do_test (9, 0, hlen, klen, 0);

	do_test (9, 0, hlen, klen, 1);

	do_test (9, 3, hlen, klen, 0);

	do_test (9, 3, hlen, klen, 1);

	do_test (9, 9, hlen, klen, 0);

	do_test (9, 9, hlen, klen, 1);

	do_test (9, 15, hlen, klen, 0);

	do_test (9, 15, hlen, klen, 1);

	do_test (15, 0, hlen, klen, 0);

	do_test (15, 0, hlen, klen, 1);

	do_test (15, 3, hlen, klen, 0);

	do_test (15, 3, hlen, klen, 1);

	do_test (15, 9, hlen, klen, 0);

	do_test (15, 9, hlen, klen, 1);

	do_test (15, 15, hlen, klen, 0);

	do_test (15, 15, hlen, klen, 1);

      }

  do_test (0, 0, page_size - 1, 16, 0);

  do_test (0, 0, page_size - 1, 16, 1);

  return ret;

}

#include <support/test-driver.c>