blob: c704d45228fcf49bdfbe58d2d2e78d1e961161bf (
plain)
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
|
//===----------------------------------------------------------------------===//
//
// ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊThe LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <fstream>
// int_type underflow();
// This test is not entirely portable
#include <fstream>
#include <cassert>
template <class CharT>
struct test_buf
: public std::basic_filebuf<CharT>
{
typedef std::basic_filebuf<CharT> base;
typedef typename base::char_type char_type;
typedef typename base::int_type int_type;
char_type* eback() const {return base::eback();}
char_type* gptr() const {return base::gptr();}
char_type* egptr() const {return base::egptr();}
void gbump(int n) {base::gbump(n);}
virtual int_type underflow() {return base::underflow();}
};
int main()
{
{
test_buf<char> f;
assert(f.open("underflow.dat", std::ios_base::in) != 0);
assert(f.is_open());
assert(f.eback() == 0);
assert(f.gptr() == 0);
assert(f.egptr() == 0);
assert(f.underflow() == '1');
assert(f.eback() != 0);
assert(f.eback() == f.gptr());
assert(*f.gptr() == '1');
assert(f.egptr() - f.eback() == 9);
}
{
test_buf<char> f;
assert(f.open("underflow.dat", std::ios_base::in) != 0);
assert(f.pubsetbuf(0, 0));
assert(f.is_open());
assert(f.eback() == 0);
assert(f.gptr() == 0);
assert(f.egptr() == 0);
assert(f.underflow() == '1');
assert(f.eback() != 0);
assert(f.eback() == f.gptr());
assert(*f.gptr() == '1');
assert(f.egptr() - f.eback() == 8);
f.gbump(8);
assert(f.sgetc() == '9');
assert(f.eback()[0] == '5');
assert(f.eback()[1] == '6');
assert(f.eback()[2] == '7');
assert(f.eback()[3] == '8');
assert(f.gptr() - f.eback() == 4);
assert(*f.gptr() == '9');
assert(f.egptr() - f.gptr() == 1);
}
{
test_buf<wchar_t> f;
assert(f.open("underflow.dat", std::ios_base::in) != 0);
assert(f.is_open());
assert(f.eback() == 0);
assert(f.gptr() == 0);
assert(f.egptr() == 0);
assert(f.underflow() == L'1');
assert(f.eback() != 0);
assert(f.eback() == f.gptr());
assert(*f.gptr() == L'1');
assert(f.egptr() - f.eback() == 9);
}
{
test_buf<wchar_t> f;
assert(f.pubsetbuf(0, 0));
assert(f.open("underflow.dat", std::ios_base::in) != 0);
assert(f.is_open());
assert(f.eback() == 0);
assert(f.gptr() == 0);
assert(f.egptr() == 0);
assert(f.underflow() == L'1');
assert(f.eback() != 0);
assert(f.eback() == f.gptr());
assert(*f.gptr() == L'1');
assert(f.egptr() - f.eback() == 8);
f.gbump(8);
assert(f.sgetc() == L'9');
assert(f.eback()[0] == L'5');
assert(f.eback()[1] == L'6');
assert(f.eback()[2] == L'7');
assert(f.eback()[3] == L'8');
assert(f.gptr() - f.eback() == 4);
assert(*f.gptr() == L'9');
assert(f.egptr() - f.gptr() == 1);
}
{
test_buf<wchar_t> f;
f.pubimbue(std::locale("en_US.UTF-8"));
assert(f.open("underflow_utf8.dat", std::ios_base::in) != 0);
assert(f.is_open());
assert(f.sbumpc() == 0x4E51);
assert(f.sbumpc() == 0x4E52);
assert(f.sbumpc() == 0x4E53);
assert(f.sbumpc() == -1);
}
}
|
