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  1. #include <algorithm>
  2. #include <cctype>
  3. #include <iomanip>
  4. #include <iostream>
  5. #include <map>
  6. #include <string>
  7. #include <queue>
  8.  
  9.  
  10.  
  11.  
  12.  
  13. inline bool isWordLetter(char c)
  14. {
  15.     return std::isalnum(c) || c == '_';
  16. }
  17.  
  18.  
  19. inline void skipws(std::queue<char>& q)
  20. {
  21.     while (!( q.empty() || isWordLetter(q.front()) ))
  22.         q.pop();
  23. }
  24.  
  25.  
  26. /* Extracts valid word.
  27.  * Returns word or empty string if no word found till the end of queue
  28.  */
  29. std::string extractWord(std::queue<char>& q)
  30. {
  31.     std::string word;
  32.     bool again = false;
  33.     do {
  34.         again = false;
  35.         skipws(q);
  36.         /* Extract all consequent word character */
  37.         while( !q.empty() && isWordLetter(q.front()) ) {
  38.             word += q.front();
  39.             q.pop();
  40.         }
  41.         /* Check if word extracted is actually word */
  42.         if (word.size() < 2 || count_if(word.begin(), word.end(), isalpha) == 0) {
  43.             word.clear();
  44.             if ( !q.empty() )
  45.                 again = true;
  46.         }
  47.     } while (again); //Repeat until we find word or exhaust our queue
  48.     std::transform(word.begin(), word.end(), word.begin(), tolower);
  49.     return word;
  50. }
  51.  
  52.  
  53. std::string getEnvString()
  54. {
  55.     extern char **environ; // needed to access your execution environment
  56.     std::string envstr;
  57.     int k = -1;
  58.     while (environ[++k] != NULL) {
  59.         envstr += environ[k];
  60.         envstr += '\n';
  61.     }
  62.     return envstr;
  63. }
  64.  
  65.  
  66. int main()
  67. {
  68.     std::string envstr = getEnvString();
  69.     std::cout << envstr << std::endl;;
  70.  
  71.     std::queue<char> line( {envstr.begin(), envstr.end()} );
  72.     size_t wordCount = 0;
  73.     std::map<std::string, unsigned> entries;
  74.     std::string word;
  75.     while((word = extractWord(line)) != "" ) {
  76.         ++wordCount;
  77.         ++entries[word];
  78.     }
  79.     std::cout << "There is " << wordCount << " words in envstring\n" <<
  80.                  "Unique words and their frequency:\n";
  81.     for(auto& p: entries) {
  82.         std::cout << std::setw(30) << p.first << ' ' << p.second << '\n';
  83.     }
  84. }
  85.  
Success #stdin #stdout 0s 3436KB
comments (?)
stdin
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Standard input is empty
stdout
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TMPDIR=/tmp/GOWirz
PATH=/usr/local/bin:/usr/bin:/bin
PWD=/home/uHkJJI
LANG=en_US.UTF-8
HOME=/home/uHkJJI
SHLVL=0

There is 20 words in envstring
Unique words and their frequency:
                           bin 3
                         en_us 1
                        gowirz 1
                          home 3
                          lang 1
                         local 1
                          path 1
                           pwd 1
                         shlvl 1
                           tmp 1
                        tmpdir 1
                        uhkjji 2
                           usr 2
                           utf 1
https://ideone.com/DKLmP1
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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