//////   file wordcount.C   //////

#include <iostream.h>
#include "Cirbuf.h"           // use circular buffer

static int wcnt = 0;          // global word count, internal linkage

int readin(Cirbuf& b)         // obtain input from stdin
{    char c;
     while ( ! b.is_full() )  // while circular buffer not full
          if ( cin.get(c) )
               b.produce(c);  // deposit into buffer
          else
               return(0);     // input closed
     return(1);               // buffer full
}

void word_count(Cirbuf& b)    // count number of words
{ int c;
  static word = 0;            // partial word indicator
     while ( ! b.is_empty() ) // while buffer not empty
        switch( c = b.consume() )  // remove one character from buffer
        {  case ' ' :
           case '\t':
           case '\n':    // word delimiters
                if ( word != 0 ) wcnt++;   // word complete
                word = 0;// partial word indicator false
                break;
           default:
                word = 1;// partial word indicator true
        }
}         

main()
{ Cirbuf bf(128);
     for (;;)
        if ( readin(bf) )      // input is producer
             word_count(bf);  // word_count is consumer
        else
        {    word_count(bf);
             break;
        }
     cout << "total " << wcnt <<  " words\n";
}