Function readline

extern/editline/src/readline.c:421–476

* read one line from input stream and return it, chomping * trailing newline (if there is any) */

 * trailing newline (if there is any)
 */
char *
readline(const char *p)
{
	HistEvent ev;
	const char * volatile prompt = p;
	int count;
	const char *ret;
	char *buf;
	static int used_event_hook;

	if (e == NULL || h == NULL)
		rl_initialize();

	rl_done = 0;

	(void)setjmp(topbuf);

	/* update prompt accordingly to what has been passed */
	if (rl_set_prompt(prompt) == -1)
		return NULL;

	if (rl_pre_input_hook)
		(*rl_pre_input_hook)(NULL, 0);

	if (rl_event_hook && !(e->el_flags&NO_TTY)) {
		el_set(e, EL_GETCFN, _rl_event_read_char);
		used_event_hook = 1;
	}

	if (!rl_event_hook && used_event_hook) {
		el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
		used_event_hook = 0;
	}

	rl_already_prompted = 0;

	/* get one line from input stream */
	ret = el_gets(e, &count);

	if (ret && count > 0) {
		int lastidx;

		buf = strdup(ret);
		if (buf == NULL)
			return NULL;
		lastidx = count - 1;
		if (buf[lastidx] == '\n')
			buf[lastidx] = '\0';
	} else
		buf = NULL;

	history(h, &ev, H_GETSIZE);
	history_length = ev.num;

	return buf;
}

/*