K&C 1-18

#include <stdio.h>

/* K&C, Execise 1-18: Write a program to remove
   trailing blanks and tabs from each line of
   input, and to delete entirely blank lines.

   I assume we print the lines at some point too. */

// removing trailing blanks and tabs must be done on char by char basis.
// removing entirely blank lines could be done in a number of ways, but
// i want to do it in a line by line basis.

int printline(int lim);

//ignores everything after spaces...

int main()
{
   printline(2000);
   return 0;
}

// printline: print a line minus excess whitespace
int printline(int lim)
{
   char s[lim];
   int c, i, prev;
   prev = 0;
   for (i = 0; i < lim - 1 && (c = getchar()) != EOF && c != '\n'; ++i)
   {//remove i < lim - 1 to get multiple lines?
      if (prev == 0)
      {//case 1: first character
         if (c >= 33)
         {//case 1a: first character is not whitespace
            s[i] = c;   //thus add it to array
            prev = c;   //thus make a note of it
         }
         else if (c < 33)
         {//case 1b: first character is whitespace
            prev = c;   //thus make a note of it
         }
      }
      else if (prev >= 33)
      {//case 2: previous character is not whitespace
         if (c >= 33)
         {//case 2a: current character is not whitespace
            s[i] = c;   //thus add it to array
         }
         else if (c < 33)
         {//case 2b: current character is whitespace
            prev = c;   //thus make a note of it
         }
      }
      else if (prev < 33)
      {//case 3: previous character is whitespace
         if (c >= 33)
         {//case 3a: current character is not whitespace
            s[i] = c;   //thus add it to array
            prev = c;   //thus make a note of it
         }
         else if (c < 33)
         {//case 3b: current character is whitespace
            ;           //nothing of note changed, carry on
         }
      }
      /*if ((prev == 0) && (c >= 33))
      {//case 1: first char is not whitespace
         s[i] = c;
         prev = c;
      }
      else if (prev >= 33 && c >= 33)
      {//case 2: previous character was not whitespace and current character not whitespace
         s[i] = c;
         prev = c;
      }
      else if ((prev < 33) && (c < 33))
      {//case 3: current character is white space and previous character is whitespace
         prev = c;
      }
      else if ((prev < 33) && (c >= 33))
      {//case 4: current character is not white space but previous character is whitespace
         s[i] = c;
         prev = c;
      }*/
   }
   if (c == '\n')
   {//add a newline character and increment counter
      s[i] = c;
      ++i;
   }
   s[i] = '\0'; //add null terminator
   if (i > 0)
   {
      printf("%s", s);
   }
   return i; //return length
}