INF205/lab_2/8_wildptr-fixed.cpp

#include <cassert>
#include <cstring>
#include <iostream>

constexpr  void crop(int num_strings, char** strings, int characters_cropped);

int main(const int argc, char** argv)
{
   /* crop the first two letters of each input argument,
    * by jumping from index 0 to index 2
    */
   const int jump_to_index = 2;  
    
   /* crop all of the strings in argv, except the one with index 0;
    * note that argv[0] is always the program's name.
    * only the argv[i] with i > 0 are genuine command-line arguments.
    */
   crop(argc-1, argv+1, jump_to_index);
    
   for(int i = 1; i < argc; i++)
       std::cout << "Argument no. " << i
                 << " was cropped to \"" << argv[i] << "\".\n";
}

/* implementation that "crops" a string by incrementing it, so that
 * it effectively begins <characters_cropped> characters further ahead.
 */
constexpr void crop(int num_strings, char** strings, const int characters_cropped)
{
   assert(characters_cropped >= 0);

   for(int i = 0; i < num_strings; i++)
      if(strlen(strings[i]) >= characters_cropped)
         strings[i] += characters_cropped;
      else strings[i] += strlen(strings[i]);
}

/* make and try executing:
 *    ./wildptr-fixed ABCDE FGHIJ KLMNO
 *    ./wildptr-fixed ABCDE FGHI JKL MN O
 */