/* Test for a tricky E2BIG situation.

   Copyright (C) 2002-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Bruno Haible <bruno@clisp.org>, 2002.

   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 <alloca.h>

#include <errno.h>

#include <iconv.h>

#include <stdbool.h>

#include <stdio.h>

#include <stdlib.h>

/* In EUC-JISX0213 and TSCII, a single input character can convert to

   a sequence of two or more Unicode characters.  When the output buffer

   has room for less Unicode characters than would be produced with an

   unconstrained output buffer, the conversion must give errno = E2BIG.  */

void

test (const char *encoding, char *inbuf, size_t inbufsize, size_t outbufsize)

{

  char *outbuf = alloca (outbufsize);

  iconv_t cd;

  char *inptr;

  size_t inlen;

  char *outptr;

  size_t outlen;

  int result;

  bool empty_input;

  bool empty_output;

  cd = iconv_open ("UTF-8", encoding);

  if (cd == (iconv_t) -1)

    {

      fprintf (stderr, "cannot convert from %s\n", encoding);

      exit (1);

    }

  inptr = inbuf;

  inlen = inbufsize;

  outptr = outbuf;

  outlen = outbufsize;

  result = iconv (cd, &inptr, &inlen, &outptr, &outlen);

  if (!(result == -1 && errno == E2BIG))

    {

      fprintf (stderr, "%s: wrong iconv result: %d/%d (%m)\n",

	       encoding, result, errno);

      exit (1);

    }

  empty_input = (inptr == inbuf && inlen == inbufsize);

  empty_output = (outptr == outbuf && outlen == outbufsize);

  if (!empty_input && empty_output)

    {

      fprintf (stderr, "%s: ate %td input bytes\n", encoding, inptr - inbuf);

      exit (1);

    }

  if (empty_input && !empty_output)

    {

      fprintf (stderr, "%s: produced %td output bytes\n",

	       encoding, outptr - outbuf);

      exit (1);

    }

  iconv_close (cd);

}

void

test_euc_jisx0213 (void)

{

  char inbuf[2] = { 0xa4, 0xf7 };

  test ("EUC-JISX0213", inbuf, sizeof (inbuf), 3);

}

void

test_tscii (void)

{

  char inbuf[1] = { 0x82 };

  test ("TSCII", inbuf, sizeof (inbuf), 3);

  test ("TSCII", inbuf, sizeof (inbuf), 6);

  test ("TSCII", inbuf, sizeof (inbuf), 9);

}

static int

do_test (void)

{

  test_euc_jisx0213 ();

  test_tscii ();

  return 0;

}

#define TEST_FUNCTION do_test ()

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