/*
 * Read a line from a descriptor.  Read the line one byte at a time,
 * looking for the newline.  We store the newline in the buffer,
 * then follow it with a null (the same as fgets(3)).
 * We return the number of characters up to, but not including,
 * the null (the same as strlen(3)).
 */

int
readline(fd, ptr, maxlen)
register int	fd;
register char	*ptr;
register int	maxlen;
{
	int	n, rc;
	char	c;

	for (n = 1; n < maxlen; n++) {
		if ( (rc = read(fd, &c, 1)) == 1) {
			*ptr++ = c;
			if (c == '\n')
				break;
		} else if (rc == 0) {
			if (n == 1)
				return(0);	/* EOF, no data read */
			else
				break;		/* EOF, some data was read */
		} else
			return(-1);	/* error */
	}

	*ptr = 0;
	return(n);
}