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  1. #include <cstring>
  2. #include <iostream>
  3. #include <sstream>
  4. #include <string>
  5. #include <unistd.h>
  6. int main()
  7. {
  8. while (true)
  9. {
  10.     int argc = 0;
  11.     std::istringstream iss;
  12.     std::string command;
  13.     std::cout << "$> ";
  14.     getline(std::cin, command);
  15.     iss.str(command);
  16.     for (unsigned i = 0; i <= command.length(); i++)
  17.     {
  18.         if (command[i] == ' ' || command[i] == '\0')
  19.         {
  20.             argc++;
  21.         }
  22.     }
  23.     std::string arr[argc+1];
  24.     for (int i = 0; i < argc; i++)
  25.     {
  26.         iss >> arr[i];
  27.     }
  28.     if (!arr[0].compare("quit"))
  29.     {
  30. 	std::cout << "break:" << std::endl;
  31.         break;
  32.     }
  33.     else
  34.     {
  35.         char* argv[argc+1];
  36.         for (int i = 0; i < argc; i++)
  37.         {
  38.             argv[i] = const_cast<char*>(arr[i].c_str()); //This line is wrong
  39.         }
  40.         argv[argc] = NULL;
  41.         execvp(argv[0], argv);
  42.     }
  43. }
  44. return 0;
  45. }
Success #stdin #stdout 0s 3024KB
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$> total 12
-rwxr-xr-x 1 root 1001 8260 Feb 25 05:29 prog
https://ideone.com/UWWgXO
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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