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[unix-history] / usr / src / usr.bin / window / wwinschar.c

#ifndef lint
static	char *sccsid = "@(#)wwinschar.c	3.10 83/11/23";
#endif

#include "ww.h"
#include "tt.h"

wwinschar(w, row, col, c)
register struct ww *w;
short c;
{
	register i;
	int nvis;

	/*
	 * First, shift the line.
	 */
	{
		register union ww_char *p, *q;

		p = &w->ww_buf[row][w->ww_b.r];
		q = p - 1;
		for (i = w->ww_b.r - col; --i > 0;)
			*--p = *--q;
		q->c_w = c;
	}

	/*
	 * If can't see it, just return.
	 */
	if (row < w->ww_i.t || row >= w->ww_i.b
	    || w->ww_i.r <= 0 || w->ww_i.r <= col)
		return;

	if (col < w->ww_i.l)
		col = w->ww_i.l;

	/*
	 * Now find out how much is actually changed, and fix wwns.
	 */
	{
		register union ww_char *buf;
		register char *win;
		register union ww_char *ns;
		register char *smap;
		char *touched;

		nvis = 0;
		smap = &wwsmap[row][col];
		for (i = w->ww_i.r - col; i > 0 && *smap++ != w->ww_index; i--)
			col++;
		if (i <= 0)
			return;
		buf = &w->ww_buf[row][col];
		win = &w->ww_win[row][col];
		ns = &wwns[row][col];
		smap = &wwsmap[row][col];
		touched = &wwtouched[row];
		c = buf->c_w ^ *win << WWC_MSHIFT;
		for (; --i >= 0;)
			if (*smap++ != w->ww_index) {
				ns++;
				buf++;
				win++;
			} else if (*win) {
				ns++->c_w = buf++->c_w ^ *win++ << WWC_MSHIFT;
				*touched = 1;
			} else {
				*ns++ = *buf++;
				win++;
				nvis++;
				*touched = 1;
			}
	}

	/*
	 * Can/Should we use delete character?
	 */
	if (tt.tt_hasinsert && nvis > (wwncol - col) / 2) {
		register union ww_char *p, *q;

		tt.tt_ninsert = 1;
		tt.tt_nmodes = c >> WWC_MSHIFT & tt.tt_availmodes;
		(*tt.tt_move)(row, col);
		(*tt.tt_putc)(c & WWC_CMASK);
		tt.tt_ninsert = 0;

		p = &wwos[row][wwncol];
		q = p - 1;
		for (i = wwncol - col; --i > 0;)
			*--p = *--q;
		q->c_w = c;
	}
}