Word Counting

Code

#include <u.h>
#include <libc.h>
#include <bio.h>

#define STDIN   0
#define IN  1   /* inside a word */
#define OUT 0   /* outside a word */

/* count lines, words, and characters in input */
void
main()
{
    Biobuf *bstdin;
    bstdin = Bfdopen(STDIN, OREAD);
    int c, nl, nw, nc, state;

    state = OUT;
    nl = nw = nc = 0;
    while((c = Bgetc(bstdin)) >= 0){
        ++nc;
        if(c == '\n')
            ++nl;
        if(c == ' ' || c == '\n' || c == '\t')
            state = OUT;
        else if(state == OUT){
            state = IN;
            ++nw;
        }
    }

    print("%ud\t%ud\t%ud\n", nl, nw, nc);

    exits(0);
}

Output

$ 9c words.c; 9l words.o -o words
$ ./words < words.c
35  95  514