libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf.pass.cpp

   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 // XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
  10
  11 // <istream>
  12
  13 // basic_istream<charT,traits>& get(basic_streambuf<char_type,traits>& sb);
  14
  15 #include <istream>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19
  20 template <class CharT>
  21 class testbuf
  22     : public std::basic_streambuf<CharT>
  23 {
  24     typedef std::basic_streambuf<CharT> base;
  25     std::basic_string<CharT> str_;
  26 public:
  27     testbuf()
  28     {
  29     }
  30     testbuf(const std::basic_string<CharT>& str)
  31         : str_(str)
  32     {
  33         base::setg(const_cast<CharT*>(str_.data()),
  34                    const_cast<CharT*>(str_.data()),
  35                    const_cast<CharT*>(str_.data() + str_.size()));
  36     }
  37
  38     std::basic_string<CharT> str() const
  39         {return std::basic_string<CharT>(base::pbase(), base::pptr());}
  40
  41 protected:
  42
  43     virtual typename base::int_type
  44         overflow(typename base::int_type ch = base::traits_type::eof())
  45         {
  46             if (ch != base::traits_type::eof())
  47             {
  48                 int n = static_cast<int>(str_.size());
  49                 str_.push_back(static_cast<CharT>(ch));
  50                 str_.resize(str_.capacity());
  51                 base::setp(const_cast<CharT*>(str_.data()),
  52                            const_cast<CharT*>(str_.data() + str_.size()));
  53                 base::pbump(n+1);
  54             }
  55             return ch;
  56         }
  57 };
  58
  59 int main(int, char**)
  60 {
  61     {
  62         testbuf<char> sb("testing\n...");
  63         std::istream is(&sb);
  64         testbuf<char> sb2;
  65         is.get(sb2);
  66         assert(sb2.str() == "testing");
  67         assert(is.good());
  68         assert(is.gcount() == 7);
  69         assert(is.get() == '\n');
  70         is.get(sb2);
  71         assert(sb2.str() == "testing...");
  72         assert(is.eof());
  73         assert(!is.fail());
  74         assert(is.gcount() == 3);
  75     }
  76 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  77     {
  78         testbuf<wchar_t> sb(L"testing\n...");
  79         std::wistream is(&sb);
  80         testbuf<wchar_t> sb2;
  81         is.get(sb2);
  82         assert(sb2.str() == L"testing");
  83         assert(is.good());
  84         assert(is.gcount() == 7);
  85         assert(is.get() == L'\n');
  86         is.get(sb2);
  87         assert(sb2.str() == L"testing...");
  88         assert(is.eof());
  89         assert(!is.fail());
  90         assert(is.gcount() == 3);
  91     }
  92 #endif
  93 #ifndef TEST_HAS_NO_EXCEPTIONS
  94     {
  95         testbuf<char> sb(" ");
  96         std::basic_istream<char> is(&sb);
  97         testbuf<char> sb2;
  98         is.exceptions(std::ios_base::eofbit);
  99         bool threw = false;
 100         try {
 101             is.get(sb2);
 102         } catch (std::ios_base::failure&) {
 103             threw = true;
 104         }
 105         assert(threw);
 106         assert(!is.bad());
 107         assert( is.eof());
 108         assert(!is.fail());
 109     }
 110 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
 111     {
 112         testbuf<wchar_t> sb(L" ");
 113         std::basic_istream<wchar_t> is(&sb);
 114         testbuf<wchar_t> sb2;
 115         is.exceptions(std::ios_base::eofbit);
 116         bool threw = false;
 117         try {
 118             is.get(sb2);
 119         } catch (std::ios_base::failure&) {
 120             threw = true;
 121         }
 122         assert(threw);
 123         assert(!is.bad());
 124         assert( is.eof());
 125         assert(!is.fail());
 126     }
 127 #endif
 128
 129     {
 130         testbuf<char> sb;
 131         std::basic_istream<char> is(&sb);
 132         testbuf<char> sb2;
 133         is.exceptions(std::ios_base::eofbit);
 134         bool threw = false;
 135         try {
 136             is.get(sb2);
 137         } catch (std::ios_base::failure&) {
 138             threw = true;
 139         }
 140         assert(threw);
 141         assert(!is.bad());
 142         assert( is.eof());
 143         assert( is.fail());
 144     }
 145 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
 146     {
 147         testbuf<wchar_t> sb;
 148         std::basic_istream<wchar_t> is(&sb);
 149         testbuf<wchar_t> sb2;
 150         is.exceptions(std::ios_base::eofbit);
 151         bool threw = false;
 152         try {
 153             is.get(sb2);
 154         } catch (std::ios_base::failure&) {
 155             threw = true;
 156         }
 157         assert(threw);
 158         assert(!is.bad());
 159         assert( is.eof());
 160         assert( is.fail());
 161     }
 162 #endif
 163 #endif // TEST_HAS_NO_EXCEPTIONS
 164
 165     return 0;
 166 }