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// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>

// Copyright (C) 2001, 2002, 2003, 2006, 2009 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library 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, or (at your option)

// any later version.

// This 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 General Public License for more details.

// You should have received a copy of the GNU General Public License along

// with this library; see the file COPYING3.  If not see

// <http://www.gnu.org/licenses/>.

// The ARM simulator does not provide support for "fstat", which

// causes "in_avail" to return an incorrect value.

// { dg-do run { xfail arm*-*-elf arm*-*-eabi } }

// 27.8.1.4 Overridden virtual functions

// { dg-require-fileio "" }

// { dg-require-binary-io "" }

#include <fstream>

#include <testsuite_hooks.h>

#include <testsuite_io.h>

// @require@ %-*.tst %-*.txt

// @diff@ %-*.tst %*.txt

const char name_01[] = "sgetn.txt"; // file with data in it

const char name_03[] = "tmp_sgetn_1io.tst"; // empty file, need to create

// Test overloaded virtual functions.

void test05()

{

  using namespace std;

  using namespace __gnu_test;

  typedef filebuf::int_type     int_type;

  typedef filebuf::traits_type  traits_type;

  bool test __attribute__((unused)) = true;

  streamsize                    strmsz_1, strmsz_2;

  char carray1[13] = "";

  char carray2[8192] = "";

  char buffer[8192] = "";

  int_type                      c1, c4;

  // streamsize sgetn(char_type *s, streamsize n)

  // streamsize xsgetn(char_type *s, streamsize n)

  // assign up to n chars to s from input sequence, indexing in_cur as

  // approp and returning the number of chars assigned

  // in | out 1

  {

    constraint_filebuf fb_03;

    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);

    VERIFY( !fb_03.write_position() );

    VERIFY( !fb_03.read_position() );

    strmsz_1 = fb_03.sgetn(carray1, 10);

    VERIFY( strmsz_1 == 0 );

    VERIFY( !fb_03.write_position() );

    VERIFY( !fb_03.read_position() );

  }

  // in | out 2

  {

    constraint_filebuf fb_01;

    // Need this since BUFSIZ is only guaranteed >= 255 and we want

    // to trigger the same underflow situation everywhere.

    fb_01.pubsetbuf(buffer, 8192);

    fb_01.open(name_01, ios_base::in | ios_base::out);

    VERIFY( !fb_01.write_position() );

    strmsz_1 = fb_01.in_avail();

    strmsz_2 = fb_01.sgetn(carray1, 10);

    VERIFY( strmsz_2 == 10 );

    strmsz_2 = fb_01.in_avail();

    VERIFY( strmsz_1 > strmsz_2 );

    c1 = fb_01.sgetc();

    VERIFY( c1 == 'b' );

    strmsz_1 = fb_01.in_avail();

    strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);

    VERIFY( strmsz_1 == strmsz_2 - 5 );

    c4 = fb_01.sgetc(); // buffer should have underflowed from above.

    VERIFY( c4 == 'e' );

    strmsz_1 = fb_01.in_avail();

    VERIFY( strmsz_1 > 0 );

    strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);

    VERIFY( strmsz_1 == strmsz_2 ); //at the end of the actual file 

    VERIFY( !fb_01.write_position() );

    VERIFY( !fb_01.read_position() );

  }

}

int main()

{

  test05();

  return 0;

}