Function re_fastputc

extern/editline/src/refresh.c:1054–1100

re_fastputc(): * Add a character fast. */

 *	Add a character fast.
 */
private void
re_fastputc(EditLine *el, Int c)
{
	int w = Width((Char)c);
	while (w > 1 && el->el_cursor.h + w > el->el_terminal.t_size.h)
	    re_fastputc(el, ' ');

	terminal__putc(el, c);
	el->el_display[el->el_cursor.v][el->el_cursor.h++] = c;
	while (--w > 0)
		el->el_display[el->el_cursor.v][el->el_cursor.h++]
			= MB_FILL_CHAR;

	if (el->el_cursor.h >= el->el_terminal.t_size.h) {
		/* if we must overflow */
		el->el_cursor.h = 0;

		/*
		 * If we would overflow (input is longer than terminal size),
		 * emulate scroll by dropping first line and shuffling the rest.
		 * We do this via pointer shuffling - it's safe in this case
		 * and we avoid memcpy().
		 */
		if (el->el_cursor.v + 1 >= el->el_terminal.t_size.v) {
			int i, lins = el->el_terminal.t_size.v;
			Char *firstline = el->el_display[0];
	
			for(i = 1; i < lins; i++)
				el->el_display[i - 1] = el->el_display[i];

			re__copy_and_pad(firstline, STR(""), (size_t)0);
			el->el_display[i - 1] = firstline;
		} else {
			el->el_cursor.v++;
			el->el_refresh.r_oldcv++;
		}
		if (EL_HAS_AUTO_MARGINS) {
			if (EL_HAS_MAGIC_MARGINS) {
				terminal__putc(el, ' ');
				terminal__putc(el, '\b');
			}
		} else {
			terminal__putc(el, '\r');
			terminal__putc(el, '\n');
		}
	}
}


/* re_fastaddc():