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  1. #include <iostream>
  2. #include <string>
  3. #include <iomanip>
  4. #include <cstdint>
  5.  
  6. std::string toUTF8(uint32_t cp)
  7. {
  8.     char utf8[4];
  9.     int len = 0;
  10.  
  11.     if (cp <= 0x007F)
  12.     {
  13.         utf8[0] = static_cast<char>(cp);
  14.         len = 1;
  15.     }
  16.     else
  17.     {
  18.         if (cp <= 0x07FF)
  19.         {
  20.             utf8[0] = 0xC0;
  21.             len = 2;
  22.         }
  23.         else if (cp <= 0xFFFF)
  24.         {
  25.             utf8[0] = 0xE0;
  26.             len = 3;
  27.         }
  28.         else if (cp <= 0x10FFFF)
  29.         {
  30.             utf8[0] = 0xF0;
  31.             len = 4;
  32.         }
  33.         else
  34.             throw std::invalid_argument("invalid codepoint");
  35.  
  36.         for(int i = 1; i < len; ++i)
  37.         {
  38.             utf8[len-i] = static_cast<char>(0x80 | (cp & 0x3F));
  39.             cp >>= 6;
  40.         }
  41.  
  42.         utf8[0] |= static_cast<char>(cp);
  43.     }
  44.  
  45.     return std::string(utf8, len);
  46. }
  47.  
  48. int main()
  49. {
  50.     std::string utf8 = toUTF8(210);
  51.  
  52. 	std::cout << utf8 << std::endl;
  53.  
  54.     std::cout << std::showbase << std::hex << std::setfill('0') << std::setw(2);
  55.     for(unsigned char c : utf8)
  56. 	    std::cout << (c & 0xFF) << ' ';
  57. 	return 0;
  58. }
Success #stdin #stdout 0s 4504KB
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0xc3 0x92
https://ideone.com/8QAJip
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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