/* Test collation function via transformation using real data.

   Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   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/>.  */

#include <ctype.h>

#include <error.h>

#include <locale.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <stdbool.h>

/* Keep in sync with string/strxfrm_l.c.  */

#define SMALL_STR_SIZE 4095

struct lines

{

  char *xfrm;

  char *line;

};

static int xstrcmp (const void *, const void *);

int

main (int argc, char *argv[])

{

  int result = 0;

  bool nocache = false;

  size_t nstrings, nstrings_max;

  struct lines *strings;

  char *line = NULL;

  size_t len = 0;

  size_t n;

  if (argc < 2)

    error (1, 0, "usage: %s <random seed> [-nocache]", argv[0]);

  if (argc == 3)

    {

      if (strcmp (argv[2], "-nocache") == 0)

	nocache = true;

      else

	{

	  printf ("Unknown option %s!\n", argv[2]);

	  exit (1);

	}

    }

  setlocale (LC_ALL, "");

  nstrings_max = 100;

  nstrings = 0;

  strings = (struct lines *) malloc (nstrings_max * sizeof (struct lines));

  if (strings == NULL)

    {

      perror (argv[0]);

      exit (1);

    }

  while (1)

    {

      char saved, *word, *newp;

      size_t l, line_len, needed;

      if (getline (&line, &len, stdin) < 0)

	break;

      if (nstrings == nstrings_max)

	{

	  strings = (struct lines *) realloc (strings,

					      (nstrings_max *= 2)

					       * sizeof (*strings));

	  if (strings == NULL)

	    {

	      perror (argv[0]);

	      exit (1);

	    }

	}

      strings[nstrings].line = strdup (line);

      l = strcspn (line, ":(;");

      while (l > 0 && isspace (line[l - 1]))

	--l;

      saved = line[l];

      line[l] = '\0';

      if (nocache)

	{

	  line_len = strlen (line);

	  word = malloc (line_len + SMALL_STR_SIZE + 1);

	  if (word == NULL)

	    {

	      printf ("malloc failed: %m\n");

	      exit (1);

	    }

	  memset (word, ' ', SMALL_STR_SIZE);

	  memcpy (word + SMALL_STR_SIZE, line, line_len);

	  word[line_len + SMALL_STR_SIZE] = '\0';

	}

      else

        word = line;

      needed = strxfrm (NULL, word, 0);

      newp = malloc (needed + 1);

      if (newp == NULL)

	{

	  printf ("malloc failed: %m\n");

	  exit (1);

	}

      strxfrm (newp, word, needed + 1);

      strings[nstrings].xfrm = newp;

      if (nocache)

	free (word);

      line[l] = saved;

      ++nstrings;

    }

  free (line);

  /* First shuffle.  */

  srandom (atoi (argv[1]));

  for (n = 0; n < 10 * nstrings; ++n)

    {

      int r1, r2, r;

      size_t idx1 = random () % nstrings;

      size_t idx2 = random () % nstrings;

      struct lines tmp = strings[idx1];

      strings[idx1] = strings[idx2];

      strings[idx2] = tmp;

      /* While we are at it a first little test.  */

      r1 = strcmp (strings[idx1].xfrm, strings[idx2].xfrm);

      r2 = strcmp (strings[idx2].xfrm, strings[idx1].xfrm);

      r = -(r1 ^ r2);

      if (r)

	r /= abs (r1 ^ r2);

      if (r < 0 || (r == 0 && (r1 != 0 || r2 != 0))

	  || (r > 0 && (r1 ^ r2) >= 0))

	printf ("collate wrong: %d vs. %d\n", r1, r2);

    }

  /* Now sort.  */

  qsort (strings, nstrings, sizeof (struct lines), xstrcmp);

  /* Print the result.  */

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

    {

      fputs (strings[n].line, stdout);

      free (strings[n].line);

      free (strings[n].xfrm);

    }

  free (strings);

  return result;

}

static int

xstrcmp (const void *ptr1, const void *ptr2)

{

  const struct lines *l1 = (const struct lines *) ptr1;

  const struct lines *l2 = (const struct lines *) ptr2;

  return strcmp (l1->xfrm, l2->xfrm);

}