/*
** $Id: wc.c 730 2008-02-08 23:45:00Z phf $
**
** A *very* simple clone of wc; check out "man wc" to see
** how much more the "real thing" does.
**
** In lecture we did a version that avoided maintaining
** word/whitespace state explicitly by keeping the last
** two characters around; a decent alternative. :-)
*/

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

int main()
{
  // Counters: characters, words, and lines so far!
  int chars = 0;
  int words = 0;
  int lines = 0;
  // Flag: Are we currently reading whitespace?
  bool white = true;

  int c;
  while ( (c = getchar()) != EOF )
  {
    // every character counts
    chars += 1;

    // every newline counts as well
    if ( c == '\n' ) {
      lines += 1;
    }

    // on transition from non-white to white we count a word
    if ( isspace( c ) ) {
      if ( !white ) {
        white = true;
        words += 1;
      }
    }
    else { // !isspace( c )
      white = false;
    }
  }

  // If the file ended while we were inside a word,
  // we need to count one more (end of file is an
  // "implicit" transition out of a word). Thanks
  // to Rinat Zakirov who caught this in lecture!
  if ( !white ) {
    words += 1;
  }

  // The format here doesn't quite match that of the
  // real wc tool.
  printf( "\t%d\t%d\t%d\n", lines, words, chars );

  return EXIT_SUCCESS;
}