1// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
2
3// Copyright (C) 2001-2015 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library.  This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14// GNU General Public License for more details.
15
16// You should have received a copy of the GNU General Public License along
17// with this library; see the file COPYING3.  If not see
18// <http://www.gnu.org/licenses/>.
19
20// The ARM simulator does not provide support for "fstat", which
21// causes "in_avail" to return an incorrect value.
22// { dg-do run { xfail arm*-*-elf arm*-*-eabi } }
23
24// 27.8.1.4 Overridden virtual functions
25
26// { dg-require-fileio "" }
27// { dg-require-binary-io "" }
28
29#include <fstream>
30#include <testsuite_hooks.h>
31#include <testsuite_io.h>
32
33// @require@ %-*.tst %-*.txt
34// @diff@ %-*.tst %*.txt
35
36const char name_01[] = "sgetn.txt"; // file with data in it
37const char name_03[] = "tmp_sgetn_1io.tst"; // empty file, need to create
38
39// Test overloaded virtual functions.
40void test05()
41{
42  using namespace std;
43  using namespace __gnu_test;
44  typedef filebuf::int_type 	int_type;
45  typedef filebuf::traits_type 	traits_type;
46
47  bool test __attribute__((unused)) = true;
48
49  streamsize 			strmsz_1, strmsz_2;
50  char carray1[13] = "";
51  char carray2[8192] = "";
52  char buffer[8192] = "";
53  int_type 			c1, c4;
54
55  // streamsize sgetn(char_type *s, streamsize n)
56  // streamsize xsgetn(char_type *s, streamsize n)
57  // assign up to n chars to s from input sequence, indexing in_cur as
58  // approp and returning the number of chars assigned
59
60  // in | out 1
61  {
62    constraint_filebuf fb_03;
63    fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);
64    VERIFY( !fb_03.write_position() );
65    VERIFY( !fb_03.read_position() );
66    strmsz_1 = fb_03.sgetn(carray1, 10);
67    VERIFY( strmsz_1 == 0 );
68    VERIFY( !fb_03.write_position() );
69    VERIFY( !fb_03.read_position() );
70  }
71
72  // in | out 2
73  {
74    constraint_filebuf fb_01;
75    // Need this since BUFSIZ is only guaranteed >= 255 and we want
76    // to trigger the same underflow situation everywhere.
77    fb_01.pubsetbuf(buffer, 8192);
78    fb_01.open(name_01, ios_base::in | ios_base::out);
79    VERIFY( !fb_01.write_position() );
80    strmsz_1 = fb_01.in_avail();
81    strmsz_2 = fb_01.sgetn(carray1, 10);
82    VERIFY( strmsz_2 == 10 );
83    strmsz_2 = fb_01.in_avail();
84    VERIFY( strmsz_1 > strmsz_2 );
85    c1 = fb_01.sgetc();
86    VERIFY( c1 == 'b' );
87    strmsz_1 = fb_01.in_avail();
88    strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
89    VERIFY( strmsz_1 == strmsz_2 - 5 );
90    c4 = fb_01.sgetc(); // buffer should have underflowed from above.
91    VERIFY( c4 == 'e' );
92    strmsz_1 = fb_01.in_avail();
93    VERIFY( strmsz_1 > 0 );
94    strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
95    VERIFY( strmsz_1 == strmsz_2 ); //at the end of the actual file
96    VERIFY( !fb_01.write_position() );
97    VERIFY( !fb_01.read_position() );
98  }
99}
100
101int main()
102{
103  test05();
104  return 0;
105}
106