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  1. #include <locale>
  2. #include <iostream>
  3.  
  4. class rot13codecvt : public std::codecvt<char, char, std::mbstate_t>
  5. {
  6. protected:
  7.   virtual ~rot13codecvt() { }
  8.  
  9.   virtual result do_out(std::mbstate_t& /* state */,
  10.                         const char* from,
  11.                         const char* from_end,
  12.                         const char*& from_next,
  13.                         char* to,
  14.                         char* to_limit,
  15.                         char*& to_next) const 
  16.       { return rot13(from, from_end, from_next, to, to_limit, to_next); }
  17.  
  18.   virtual result do_in(std::mbstate_t& /* state */,
  19.                        const char* from,
  20.                        const char* from_end,
  21.                        const char*& from_next,
  22.                        char* to,
  23.                        char* to_limit,
  24.                        char*& to_next) const
  25.       { return rot13(from, from_end, from_next, to, to_limit, to_next); }
  26.  
  27.   virtual result do_unshift(std::mbstate_t& state,
  28.                        char* to,
  29.                        char* to_limit,
  30.                        char*& to_next) const;
  31.  
  32.   virtual int do_encoding() const throw() { return 1; }
  33.  
  34.   virtual bool do_always_noconv() const throw() { return false; }
  35.  
  36.   virtual int do_length(const std::mbstate_t&,
  37.                         const char* from,
  38.                         const char* end,
  39.                         size_t max) const;
  40.  
  41.   virtual int do_max_length() const throw() { return 1; }
  42.  
  43. private:
  44.   result rot13(const char* from,
  45.                const char* from_end,
  46.                const char*& from_next,
  47.                char* to,
  48.                char* to_limit,
  49.                char*& to_next) const;
  50. }; // class rot13codecvt
  51.  
  52. static const unsigned char table[]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,78,79,80,81,82,83,84,85,86,87,88,89,90,65,66,67,68,69,70,71,72,73,74,75,76,77,91,92,93,94,95,96,110,111,112,113,114,115,116,117,118,119,120,121,122,97,98,99,100,101,102,103,104,105,106,107,108,109,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255};
  53.  
  54. std::codecvt_base::result rot13codecvt::rot13(const char* from,
  55.                const char* from_end,
  56.                const char*& from_next,
  57.                char* to,
  58.                char* to_limit,
  59.                char*& to_next) const
  60. {
  61.   from_next = from;
  62.   to_next = to;
  63.  
  64.   while((to_next != to_limit) && (from_next != from_end) )
  65.     *to_next++ = table[static_cast<unsigned char>(*from_next++)];
  66.  
  67.   return (from_next == from_end) ? std::codecvt_base::ok : std::codecvt_base::partial; 
  68. } // rot13
  69.  
  70. std::codecvt_base::result rot13codecvt::do_unshift(std::mbstate_t& /* state */,
  71.                             char* to,
  72.                             char* /* to_limit */,
  73.                             char*& to_next) const
  74. {
  75.   to_next = to;
  76.   return std::codecvt_base::ok;
  77. } // do_unshift
  78.  
  79. int rot13codecvt::do_length(const std::mbstate_t&,
  80.                         const char* from,
  81.                         const char* end,
  82.                         size_t max) const
  83. {
  84.   return std::max<int>(end - from, max);
  85. } // do_length
  86.  
  87.  
  88. int main ()
  89. {
  90.   std::cout.imbue(std::locale(std::locale("C"), new rot13codecvt()));
  91.   std::cout << "The quick brown fox ran over the lazy dog" << std::endl;
  92. }
  93.  
Success #stdin #stdout 0s 3232KB
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Standard input is empty
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The quick brown fox ran over the lazy dog
https://ideone.com/5GIYvV
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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