#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>

// Define our functions..
int isLetterOrDigit(char);
int getNextWord(int);
int main(int, char **);

int main(int argc, char **argv) {
	int fd;

	if (argc < 2) {
		fprintf(stderr, "usage: %s <input file>\n", argv[0]);
		exit(1);
	}

	if ((fd = open(argv[1], O_RDONLY)) < 1) {
		fprintf(stderr, "Cannot open input file %s: %s\n", 
			argv[1], strerror(errno));
			exit(1);
	}

	while (getNextWord(fd));
}

int isLetterOrDigit(char c) {
	return(isdigit(c));
}

int getNextWord(int fd) {
	char c = 0;
	int  i = 0;
	char wordbuf[4096];

	while (read(fd, &c, 1) == 1) {
		if (i >= 4096) {
			fprintf(stderr, "Word buffer overflow\n");
			exit(1);
		}

		isLetterOrDigit(c);

		if (isalnum(c))
			wordbuf[i++] = c;
		else
			break;
	}

	if (i) {
		wordbuf[i] = 0;
		printf("%d: %s\n", i, wordbuf);
	}

	return(i);
}