line_to_buf
buf2 = line_to_buf(buf2, buf); /* append buf to buf2 */
buf2 = line_to_buf(buf2, buf);
buf2 = line_to_buf(buf2, buf);
*buffer = line_to_buf(*buffer, buf); /* append buf to buffer */
*buffer = line_to_buf(*buffer, buf);
*buffer = line_to_buf(*buffer, buf);
extern char *line_to_buf(char *, const char *);