Take arguments and output them as if '-e' & '-c' options.

optional_output.c

#include <stdio.h>
#include <stdlib.h>

int
main (int   argc,
      char* argv[])
{
  int num;
  if (argc >= 1)
    num = argc;

  char* str[num];
  int idx_buf[num]; 
  int i;
  for (i = 0; i < num; i++)
  {
    str[i] = argv[i];
    idx_buf[i] = 0;
  }

  int count = 0;
  i = 0;
  while (num)
  {
    int j = 0;

    while (str[i] != '\0')
    {   
      if (str[i][j] == '-')
      {   
        j++;
        if (str[i][j] == 'e')
        {
          idx_buf[i] = 1;
          i++;
          break;
        }
        else if (str[i][j] == 'c')
        {
          idx_buf[i] = 2;
          i++;
          count = atoi (str[i]);
          break;
        }
      }
      else
      {
        idx_buf[i] = 3;
        i++;
        break;
      }
    }
    num--;
  }

  i = 1;
  while (idx_buf[i] != 0)
  {
    int idx;
    if (idx_buf[i] == 1)
    {
      i++;
      if (idx_buf[i] == 3)
      {
        idx = i;
        while (count)
        {
          printf ("%d %s\n", count, str[idx]);
          count--;
        }
        i++;
        continue;
      }
    }
    else
      i++;
  }

  return 0;
}