1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
// Copyright (C) 2020-2024 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/>.
// { dg-do run }
// { dg-options "-DSIMULATOR_TEST" { target simulator } }
// { dg-timeout-factor 2 { target ilp32 } }
// PR libstdc++/94749
// basic_istream::ignore(n, c) discards n+1 if next character is equal to c.
#include <sstream>
#include <limits>
#include <testsuite_hooks.h>
typedef wchar_t C;
void
test01()
{
std::basic_istringstream<C> s(L" + -");
s.ignore(1, L'+');
VERIFY( s.gcount() == 1 );
VERIFY( s.get() == L'+' );
s.ignore(3, L'-');
VERIFY( s.gcount() == 3 );
VERIFY( s.get() == L'-' );
}
void
test02()
{
std::basic_istringstream<C> s(L".+...-");
s.ignore(1, L'+');
VERIFY( s.gcount() == 1 );
VERIFY( s.get() == L'+' );
s.ignore(3, L'-');
VERIFY( s.gcount() == 3 );
VERIFY( s.get() == L'-' );
}
void
test03()
{
std::basic_istringstream<C, __gnu_cxx::char_traits<C> > s(L" + -");
s.ignore(1, L'+');
VERIFY( s.gcount() == 1 );
VERIFY( s.get() == L'+' );
s.ignore(3, L'-');
VERIFY( s.gcount() == 3 );
VERIFY( s.get() == L'-' );
}
void
test04()
{
std::basic_istringstream<C, __gnu_cxx::char_traits<C> > s(L".+...-");
s.ignore(1, L'+');
VERIFY( s.gcount() == 1 );
VERIFY( s.get() == L'+' );
s.ignore(3, L'-');
VERIFY( s.gcount() == 3 );
VERIFY( s.get() == L'-' );
}
// The original fix for PR libstdc++/94749 failed to discard the delimiter
// if it occurred after numeric_limits<streamsize>::max() had been seen.
// This streambuf will keep filling the get area with zero bytes until
// almost numeric_limits<streamsize>::max() characters have been read,
// and then return one more buffer that has L"123" at its end.
template<typename T>
struct buff : std::basic_streambuf<typename T::char_type, T>
{
typedef typename T::char_type char_type;
typedef typename T::int_type int_type;
typedef std::streamsize streamsize;
typedef std::numeric_limits<streamsize> limits;
buff() : count(0), buf() { }
int_type underflow()
{
// Number of characters left until we overflow the counter
const streamsize headroom = limits::max() - count;
if (headroom == 0)
return T::eof();
if (bufsz < headroom)
{
this->setg(buf, buf, buf + bufsz);
count += bufsz;
}
else
{
// write L"123" across the 2GB boundary
buf[headroom-1] = L'1';
buf[headroom+0] = L'2';
buf[headroom+1] = L'3';
this->setg(buf, buf, buf + headroom + 2);
count = limits::max();
}
return buf[0];
}
streamsize count;
static const streamsize bufsz = 2048 << limits::digits10;
char_type buf[bufsz + 2];
};
void
test05()
{
// Not possible to overflow 64-bit streamsize in reasonable time.
if (std::numeric_limits<std::streamsize>::digits > 32)
return;
typedef std::char_traits<C> T;
std::basic_istream<C, T> in(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'1');
VERIFY(in.good());
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == L'2');
VERIFY(in.get() == L'3');
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'2');
VERIFY(in.good());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == L'3');
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'3');
VERIFY(in.good());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'4');
VERIFY(in.eof());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == T::eof());
delete in.rdbuf(0);
}
void
test06()
{
if (std::numeric_limits<std::streamsize>::digits > 32)
return;
typedef __gnu_cxx::char_traits<C> T;
std::basic_istream<C, T> in(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'1');
VERIFY(in.good());
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == L'2');
VERIFY(in.get() == L'3');
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'2');
VERIFY(in.good());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == L'3');
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'3');
VERIFY(in.good());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == T::eof());
delete in.rdbuf(new buff<T>);
in.ignore(std::numeric_limits<std::streamsize>::max(), L'4');
VERIFY(in.eof());
// The standard doesn't say what gcount() should return in this case:
VERIFY(in.gcount() == std::numeric_limits<std::streamsize>::max());
VERIFY(in.get() == T::eof());
delete in.rdbuf(0);
}
int
main()
{
test01();
test02();
test03();
test04();
#ifndef SIMULATOR_TEST
test05();
test06();
#endif
}
|