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1 | // 2001-05-21 Benjamin Kosnik <bkoz@redhat.com> |
2 | ||
7adcbafe | 3 | // Copyright (C) 2001-2022 Free Software Foundation, Inc. |
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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 | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
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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 | |
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17 | // with this library; see the file COPYING3. If not see |
18 | // <http://www.gnu.org/licenses/>. | |
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19 | |
20 | // 27.8.1.4 Overridden virtual functions | |
21 | ||
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22 | // { dg-require-fileio "" } |
23 | ||
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24 | #include <fstream> |
25 | #include <testsuite_hooks.h> | |
26 | #include <testsuite_io.h> | |
27 | ||
28 | // @require@ %-*.tst %-*.txt | |
29 | // @diff@ %-*.tst %*.txt | |
30 | ||
31 | const char name_01[] = "tmp_sungetc_1io.tst"; // empty file, need to create | |
32 | ||
33 | void test01() | |
34 | { | |
35 | using namespace std; | |
aecf642c | 36 | using namespace __gnu_test; |
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37 | |
38 | typedef filebuf::int_type int_type; | |
39 | typedef filebuf::traits_type traits_type; | |
40 | typedef size_t size_type; | |
41 | ||
0bad3b7c | 42 | streamsize strmsz_1, strmsz_2; |
567d4027 | 43 | int_type c1, c2; |
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44 | |
45 | // int_type sungetc() | |
46 | // if in_cur not avail, return pbackfail(), else decrement and | |
47 | // return to_int_type(*gptr()) | |
48 | ||
49 | // in | out | |
50 | { | |
51 | constraint_filebuf fb_01; | |
52 | fb_01.open(name_01, ios_base::out | ios_base::in | ios_base::trunc); | |
71b46021 | 53 | VERIFY( !fb_01.write_position() ); |
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54 | VERIFY( !fb_01.read_position() ); |
55 | fb_01.sputc('u'); | |
56 | fb_01.sputc('v'); | |
57 | fb_01.pubseekoff(-1, std::ios_base::end); | |
567d4027 | 58 | fb_01.sbumpc(); |
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59 | strmsz_1 = fb_01.in_avail(); |
60 | c2 = fb_01.sungetc(); | |
61 | strmsz_2 = fb_01.in_avail(); | |
62 | VERIFY( c2 == 'v' ); // VERIFY( c2 != traits_type::eof() ); | |
63 | VERIFY( strmsz_1 + 1 == strmsz_2 ); | |
64 | //test for _in_cur == _in_end | |
65 | fb_01.pubseekoff(0, std::ios_base::end); | |
66 | strmsz_1 = fb_01.in_avail(); // -1 cuz at the end | |
67 | c1 = fb_01.sgetc(); | |
68 | c2 = fb_01.sungetc(); | |
69 | strmsz_2 = fb_01.in_avail(); // 1 | |
567d4027 | 70 | fb_01.sgetc(); |
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71 | VERIFY( c1 != c2 ); |
72 | VERIFY( strmsz_2 != strmsz_1 ); | |
73 | VERIFY( strmsz_2 == 1 ); | |
71b46021 | 74 | VERIFY( !fb_01.write_position() ); |
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75 | VERIFY( fb_01.read_position() ); |
76 | } | |
77 | } | |
78 | ||
11f10e6b | 79 | int main() |
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80 | { |
81 | test01(); | |
82 | return 0; | |
83 | } |