Function c_gets

extern/editline/src/chared.c:671–730

c_gets(): * Get a string */

 *	Get a string
 */
protected int
c_gets(EditLine *el, Char *buf, const Char *prompt)
{
	Char ch;
	ssize_t len;
	Char *cp = el->el_line.buffer;

	if (prompt) {
		len = (ssize_t)Strlen(prompt);
		(void)memcpy(cp, prompt, (size_t)len * sizeof(*cp));
		cp += len;
	}
	len = 0;

	for (;;) {
		el->el_line.cursor = cp;
		*cp = ' ';
		el->el_line.lastchar = cp + 1;
		re_refresh(el);

		if (FUN(el,getc)(el, &ch) != 1) {
			ed_end_of_file(el, 0);
			len = -1;
			break;
		}

		switch (ch) {

		case 0010:	/* Delete and backspace */
		case 0177:
			if (len == 0) {
				len = -1;
				break;
			}
			cp--;
			continue;

		case 0033:	/* ESC */
		case '\r':	/* Newline */
		case '\n':
			buf[len] = ch;
			break;

		default:
			if (len >= (ssize_t)(EL_BUFSIZ - 16))
				terminal_beep(el);
			else {
				buf[len++] = ch;
				*cp++ = ch;
			}
			continue;
		}
		break;
	}

	el->el_line.buffer[0] = '\0';
	el->el_line.lastchar = el->el_line.buffer;
	el->el_line.cursor = el->el_line.buffer;