1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// REQUIRES: locale.en_US.UTF-8
10
11// <fstream>
12
13// int_type overflow(int_type c = traits::eof());
14
15// This test is not entirely portable
16
17#include <fstream>
18#include <cassert>
19
20#include "test_macros.h"
21#include "platform_support.h" // locale name macros
22
23template <class CharT>
24struct test_buf
25 : public std::basic_filebuf<CharT>
26{
27 typedef std::basic_filebuf<CharT> base;
28 typedef typename base::char_type char_type;
29 typedef typename base::int_type int_type;
30 typedef typename base::traits_type traits_type;
31
32 char_type* pbase() const {return base::pbase();}
33 char_type* pptr() const {return base::pptr();}
34 char_type* epptr() const {return base::epptr();}
35 void gbump(int n) {base::gbump(n);}
36
37 virtual int_type overflow(int_type c = traits_type::eof()) {return base::overflow(c);}
38};
39
40int main(int, char**)
41{
42 {
43 test_buf<char> f;
44 assert(f.open("overflow.dat", std::ios_base::out) != 0);
45 assert(f.is_open());
46 assert(f.pbase() == 0);
47 assert(f.pptr() == 0);
48 assert(f.epptr() == 0);
49 assert(f.overflow('a') == 'a');
50 assert(f.pbase() != 0);
51 assert(f.pptr() == f.pbase());
52 assert(f.epptr() - f.pbase() == 4095);
53 }
54 {
55 test_buf<char> f;
56 assert(f.open("overflow.dat", std::ios_base::in) != 0);
57 assert(f.is_open());
58 assert(f.sgetc() == 'a');
59 }
60 std::remove(filename: "overflow.dat");
61 {
62 test_buf<char> f;
63 f.pubsetbuf(s: 0, n: 0);
64 assert(f.open("overflow.dat", std::ios_base::out) != 0);
65 assert(f.is_open());
66 assert(f.pbase() == 0);
67 assert(f.pptr() == 0);
68 assert(f.epptr() == 0);
69 assert(f.overflow('a') == 'a');
70 assert(f.pbase() == 0);
71 assert(f.pptr() == 0);
72 assert(f.epptr() == 0);
73 }
74 {
75 test_buf<char> f;
76 assert(f.open("overflow.dat", std::ios_base::in) != 0);
77 assert(f.is_open());
78 assert(f.sgetc() == 'a');
79 }
80 std::remove(filename: "overflow.dat");
81
82#ifndef TEST_HAS_NO_WIDE_CHARACTERS
83 {
84 test_buf<wchar_t> f;
85 assert(f.open("overflow.dat", std::ios_base::out) != 0);
86 assert(f.is_open());
87 assert(f.pbase() == 0);
88 assert(f.pptr() == 0);
89 assert(f.epptr() == 0);
90 assert(f.overflow(L'a') == L'a');
91 assert(f.pbase() != 0);
92 assert(f.pptr() == f.pbase());
93 assert(f.epptr() - f.pbase() == 4095);
94 }
95 {
96 test_buf<wchar_t> f;
97 assert(f.open("overflow.dat", std::ios_base::in) != 0);
98 assert(f.is_open());
99 assert(f.sgetc() == L'a');
100 }
101 std::remove(filename: "overflow.dat");
102 {
103 test_buf<wchar_t> f;
104 f.pubsetbuf(s: 0, n: 0);
105 assert(f.open("overflow.dat", std::ios_base::out) != 0);
106 assert(f.is_open());
107 assert(f.pbase() == 0);
108 assert(f.pptr() == 0);
109 assert(f.epptr() == 0);
110 assert(f.overflow(L'a') == L'a');
111 assert(f.pbase() == 0);
112 assert(f.pptr() == 0);
113 assert(f.epptr() == 0);
114 }
115 {
116 test_buf<wchar_t> f;
117 assert(f.open("overflow.dat", std::ios_base::in) != 0);
118 assert(f.is_open());
119 assert(f.sgetc() == L'a');
120 }
121 std::remove(filename: "overflow.dat");
122 {
123 test_buf<wchar_t> f;
124 f.pubimbue(std::locale(LOCALE_en_US_UTF_8));
125 assert(f.open("overflow.dat", std::ios_base::out) != 0);
126 assert(f.sputc(0x4E51) == 0x4E51);
127 assert(f.sputc(0x4E52) == 0x4E52);
128 assert(f.sputc(0x4E53) == 0x4E53);
129 }
130 {
131 test_buf<char> f;
132 assert(f.open("overflow.dat", std::ios_base::in) != 0);
133 assert(f.is_open());
134 assert(f.sbumpc() == 0xE4);
135 assert(f.sbumpc() == 0xB9);
136 assert(f.sbumpc() == 0x91);
137 assert(f.sbumpc() == 0xE4);
138 assert(f.sbumpc() == 0xB9);
139 assert(f.sbumpc() == 0x92);
140 assert(f.sbumpc() == 0xE4);
141 assert(f.sbumpc() == 0xB9);
142 assert(f.sbumpc() == 0x93);
143 assert(f.sbumpc() == -1);
144 }
145 std::remove(filename: "overflow.dat");
146#endif // TEST_HAS_NO_WIDE_CHARACTERS
147
148 return 0;
149}
150

source code of libcxx/test/std/input.output/file.streams/fstreams/filebuf.virtuals/overflow.pass.cpp