Exercise 1.12: Print each word on a new line

Code

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

#define STDIN   0
#define STDOUT  1

/* print each word on a new line */
void
main()
{
    Biobuf *bstdin, *bstdout;
    bstdin = Bfdopen(STDIN, OREAD);
    bstdout = Bfdopen(STDOUT, OWRITE);
    char c, prev;

    prev = 'x';     /* this can be any non-blank character */
    c = Bgetc(bstdin);
    while(c >= 0){
        if(c == ' ' && prev != ' ')
            Bputc(bstdout, '\n');
        else
            Bputc(bstdout, c);
        Bflush(bstdout);
        prev = c;
        c = Bgetc(bstdin);
    }

exits(0);
}

Output

$ ./w-l
Once upon a time...
Once
upon
a
time...