/* Test of conversion from UTF-8 to legacy encodings.
   Copyright (C) 2007 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */

#include <config.h>

#include "uniconv.h"

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "unistr.h"

#define SIZEOF(array) (sizeof (array) / sizeof (array[0]))
#define ASSERT(expr) \
  do									     \
    {									     \
      if (!(expr))							     \
        {								     \
          fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
          abort ();							     \
        }								     \
    }									     \
  while (0)

/* Magic number for detecting bounds violations.  */
#define MAGIC 0x1983EFF1

static size_t *
new_offsets (size_t n)
{
  size_t *offsets = (size_t *) malloc ((n + 1) * sizeof (size_t));
  offsets[n] = MAGIC;
  return offsets;
}

int
main ()
{
  static enum iconv_ilseq_handler handlers[] =
    { iconveh_error, iconveh_question_mark, iconveh_escape_sequence };
  size_t h;
  size_t o;
  size_t i;

#if HAVE_ICONV
  /* Assume that iconv() supports at least the encodings ASCII, ISO-8859-1,
     ISO-8859-2, and UTF-8.  */

  /* Test conversion from UTF-8 to ISO-8859-1 with no errors.  */
  for (h = 0; h < SIZEOF (handlers); h++)
    {
      enum iconv_ilseq_handler handler = handlers[h];
      static const uint8_t input[] = "\303\204rger mit b\303\266sen B\303\274bchen ohne Augenma\303\237";
      static const char expected[] = "\304rger mit b\366sen B\374bchen ohne Augenma\337";
      for (o = 0; o < 2; o++)
	{
	  size_t *offsets = (o ? new_offsets (u8_strlen (input)) : NULL);
	  char *result = NULL;
	  size_t length = 0;
	  int retval = u8_conv_to_encoding ("ISO-8859-1", handler,
					    input, u8_strlen (input),
					    offsets,
					    &result, &length);
	  ASSERT (retval == 0);
	  ASSERT (length == strlen (expected));
	  ASSERT (result != NULL);
	  ASSERT (memcmp (result, expected, length) == 0);
	  if (o)
	    {
	      for (i = 0; i < 41; i++)
		ASSERT (offsets[i] == (i < 1 ? i :
				       i == 1 ? (size_t)(-1) :
				       i < 13 ? i - 1 :
				       i == 13 ? (size_t)(-1) :
				       i < 20 ? i - 2 :
				       i == 20 ? (size_t)(-1) :
				       i < 40 ? i - 3 :
				       i == 40 ? (size_t)(-1) :
				       i - 4));
	      ASSERT (offsets[41] == MAGIC);
	      free (offsets);
	    }
	  free (result);
	}
    }

  /* Test conversion from UTF-8 to ISO-8859-1 with EILSEQ.  */
  for (h = 0; h < SIZEOF (handlers); h++)
    {
      enum iconv_ilseq_handler handler = handlers[h];
      static const uint8_t input[] = "Rafa\305\202 Maszkowski"; /* Rafał Maszkowski */
      for (o = 0; o < 2; o++)
	{
	  size_t *offsets = (o ? new_offsets (u8_strlen (input)) : NULL);
	  char *result = NULL;
	  size_t length = 0;
	  int retval = u8_conv_to_encoding ("ISO-8859-1", handler,
					    input, u8_strlen (input),
					    offsets,
					    &result, &length);
	  switch (handler)
	    {
	    case iconveh_error:
	      ASSERT (retval == -1 && errno == EILSEQ);
	      ASSERT (result == NULL);
	      ASSERT (length == 0);
	      break;
	    case iconveh_question_mark:
	      {
		static const char expected[] = "Rafa? Maszkowski";
		static const char expected_translit[] = "Rafal Maszkowski";
		ASSERT (retval == 0);
		ASSERT (length == strlen (expected));
		ASSERT (result != NULL);
		ASSERT (memcmp (result, expected, length) == 0
			|| memcmp (result, expected_translit, length) == 0);
		if (o)
		  {
		    for (i = 0; i < 17; i++)
		      ASSERT (offsets[i] == (i < 5 ? i :
					     i == 5 ? (size_t)(-1) :
					     i - 1));
		    ASSERT (offsets[17] == MAGIC);
		    free (offsets);
		  }
		free (result);
	      }
	      break;
	    case iconveh_escape_sequence:
	      {
		static const char expected[] = "Rafa\\u0142 Maszkowski";
		ASSERT (retval == 0);
		ASSERT (length == strlen (expected));
		ASSERT (result != NULL);
		ASSERT (memcmp (result, expected, length) == 0);
		if (o)
		  {
		    for (i = 0; i < 17; i++)
		      ASSERT (offsets[i] == (i < 5 ? i :
					     i == 5 ? (size_t)(-1) :
					     i + 4));
		    ASSERT (offsets[17] == MAGIC);
		    free (offsets);
		  }
		free (result);
	      }
	      break;
	    }
	}
    }

  /* Test conversion from UTF-8 to ISO-8859-1 with EINVAL.  */
  for (h = 0; h < SIZEOF (handlers); h++)
    {
      enum iconv_ilseq_handler handler = handlers[h];
      static const uint8_t input[] = "\342";
      for (o = 0; o < 2; o++)
	{
	  size_t *offsets = (o ? new_offsets (u8_strlen (input)) : NULL);
	  char *result = NULL;
	  size_t length = 0;
	  int retval = u8_conv_to_encoding ("ISO-8859-1", handler,
					    input, u8_strlen (input),
					    offsets,
					    &result, &length);
	  ASSERT (retval == 0);
	  ASSERT (length == strlen (""));
	  ASSERT (result != NULL);
	  if (o)
	    {
	      ASSERT (offsets[0] == 0);
	      ASSERT (offsets[1] == MAGIC);
	      free (offsets);
	    }
	  free (result);
	}
    }

#endif

  return 0;
}