#include <stdio.h>
#include <stddef.h>

#define EOL (-1)

extern int getword(char *lbuf, char *buf, size_t size,
        int first(char c), int rest(char c));
/*
reads the next `word' from the string lbuf and stores it as a
null-terminated string in buf[0..size-1] and returns the length of the
word (not counting the terminating null character). When getword
reaches the end of the string lbuf without consuming a word, it
returns EOL. If a word is longer than size-1 characters, the excess
characters are ignored.

first and rest identify the characters that comprise a word: A word is
a contiguous sequence of characters that begins with a character for
which first returns nonzero followed by zero or more character for
which rest returns nonzero.

It is a checked runtime error for lbuf, buf, first, or rest to be NULL
or for size to be 0.
*/