/* Verify that ftell does not go into an infinite loop when a conversion fails

   due to insufficient space in the buffer.

   Copyright (C) 2014-2018 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/>.  */

#include <wchar.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <locale.h>

#include <errno.h>

#include <unistd.h>

static int do_test (void);

#define TEST_FUNCTION do_test ()

#include "../test-skeleton.c"

/* Arbitrary number large enough so that the target buffer during conversion is

   not large enough.  */

#define STRING_SIZE (1400)

#define NSTRINGS (2)

static int

do_test (void)

{

  FILE *fp = NULL;

  wchar_t *inputs[NSTRINGS] = {NULL};

  int ret = 1;

  if (setlocale (LC_ALL, "en_US.UTF-8") == NULL)

    {

      printf ("Cannot set en_US.UTF-8 locale.\n");

      goto out;

    }

  /* Generate input from one character, chosen because it has an odd number of

     bytes in UTF-8, making it easier to reproduce the problem:

     NAME    Hiragana letter GO

     CHAR    ご

     UTF-8   E38194

     UCS     3054

     MARC-8  692434  */

  wchar_t seed = L'ご';

  for (int i = 0; i < NSTRINGS; i++)

    {

      inputs[i] = malloc (STRING_SIZE * sizeof (wchar_t));

      if (inputs[i] == NULL)

	{

	  printf ("Failed to allocate memory for inputs: %m\n");

	  goto out;

	}

      wmemset (inputs[i], seed, STRING_SIZE - 1);

      inputs[i][STRING_SIZE - 1] = L'\0';

    }

  char *filename;

  int fd = create_temp_file ("tst-fseek-wide-partial.out", &filename);

  if (fd == -1)

    {

      printf ("create_temp_file: %m\n");

      goto out;

    }

  fp = fdopen (fd, "w+");

  if (fp == NULL)

    {

      printf ("fopen: %m\n");

      close (fd);

      goto out;

    }

  for (int i = 0; i < NSTRINGS; i++)

    {

      printf ("offset: %ld\n", ftell (fp));

      if (fputws (inputs[i], fp) == -1)

	{

	  perror ("fputws");

	  goto out;

	}

    }

  ret = 0;

out:

  if (fp != NULL)

    fclose (fp);

  for (int i = 0; i < NSTRINGS; i++)

    free (inputs[i]);

  return ret;

}