libstdc++-v3/testsuite/27_io/basic_ostream/inserters_other/char/4.cc

   1 // 1999-08-16 bkoz
   2 // 1999-11-01 bkoz
   3
   4 // Copyright (C) 1999-2020 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // 27.6.2.5.4 basic_ostream character inserters
  22
  23 #include <ostream>
  24 #include <sstream>
  25 #include <cstdio>
  26 #include <testsuite_hooks.h>
  27
  28 class test_buffer_1 : public std::streambuf
  29 {
  30 public:
  31   test_buffer_1(const std::string& s) : str(s), it(str.begin()) { }
  32
  33 protected:
  34   virtual int underflow() { return (it != str.end() ? *it : EOF); }
  35   virtual int uflow() { return (it != str.end() ? *it++ : EOF); }
  36
  37 private:
  38   const std::string str;
  39   std::string::const_iterator it;
  40 };
  41
  42
  43 class test_buffer_2 : public std::streambuf
  44 {
  45 public:
  46   test_buffer_2(const std::string& s) : str(s), it(str.begin()) { }
  47
  48 protected:
  49   virtual int underflow() { return (it != str.end() ? *it : EOF); }
  50   virtual int uflow() { return (it != str.end() ? *it++ : EOF); }
  51   virtual std::streamsize showmanyc() { return std::distance(it, str.end()); }
  52 private:
  53   const std::string str;
  54   std::string::const_iterator it;
  55 };
  56
  57
  58 class test_buffer_3 : public std::streambuf
  59 {
  60 public:
  61   test_buffer_3(const std::string& s) : str(s), it(str.begin()) { }
  62
  63 protected:
  64   virtual int underflow() { return (it != str.end() ? *it : EOF); }
  65   virtual int uflow() { return (it != str.end() ? *it++ : EOF); }
  66   virtual std::streamsize showmanyc()
  67   {
  68     std::streamsize ret = std::distance(it, str.end());
  69     return ret > 0 ? ret : -1;
  70   }
  71 private:
  72   const std::string str;
  73   std::string::const_iterator it;
  74 };
  75
  76 class test_buffer_4 : public std::streambuf {
  77 public:
  78   test_buffer_4(const std::string& s) : str(s), it(str.begin())
  79   {
  80     if (it != str.end()) {
  81       buf[0] = *it++;
  82       setg(buf, buf, buf+1);
  83     }
  84   }
  85
  86 protected:
  87   virtual int underflow() { return (it != str.end() ? *it : EOF); }
  88   virtual int uflow() { return (it != str.end() ? *it++ : EOF); }
  89   virtual std::streamsize showmanyc() {
  90     std::streamsize ret = std::distance(it, str.end());
  91     return ret > 0 ? ret : -1;
  92   }
  93 private:
  94   const std::string str;
  95   std::string::const_iterator it;
  96   char buf[1];
  97 };
  98
  99 void test(const std::string& str, std::streambuf& buf)
 100 {
 101   std::ostringstream out;
 102   std::istream in(&buf);
 103
 104   out << in.rdbuf();
 105
 106   if (out.str() != str)
 107     VERIFY( false );
 108 }
 109
 110 // libstdc++/6745
 111 // libstdc++/8071
 112 // libstdc++/8127
 113 // Jonathan Lennox  <lennox@cs.columbia.edu>
 114 void test05()
 115 {
 116   std::string string_a("Hello, world!");
 117   std::string string_b("");
 118
 119   test_buffer_1 buf1a(string_a);
 120   test_buffer_1 buf1b(string_b);
 121
 122   test_buffer_2 buf2a(string_a);
 123   test_buffer_2 buf2b(string_b);
 124
 125   test_buffer_3 buf3a(string_a);
 126   test_buffer_3 buf3b(string_b);
 127
 128   test_buffer_4 buf4a(string_a);
 129   test_buffer_4 buf4b(string_b);
 130
 131   test(string_a, buf1a);
 132   test(string_b, buf1b);
 133
 134   test(string_a, buf2a);
 135   test(string_b, buf2b);
 136
 137   test(string_a, buf3a);
 138   test(string_b, buf3b);
 139
 140   test(string_a, buf4a);
 141   test(string_b, buf4b);
 142 }
 143
 144 int
 145 main()
 146 {
 147   test05();
 148   return 0;
 149 }