window-copy.c - tmux - Rivoreo Source Code Repositories

 /* $Id: window-copy.c,v 1.11 2007-11-27 19:32:15 nicm Exp $ */

 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */

 #include <sys/types.h>

 #include <string.h>

 #include "tmux.h"

 void	window_copy_init(struct window *);
 void	window_copy_resize(struct window *, u_int, u_int);
 void	window_copy_draw(
     	    struct window *, struct screen_draw_ctx *, u_int, u_int);
 void	window_copy_key(struct window *, int);

 void	window_copy_draw_position(struct window *, struct screen_draw_ctx *);

 void	window_copy_copy_selection(struct window *);
 void	window_copy_copy_line(
 	     struct window *, char **, size_t *, size_t *, u_int, u_int, u_int);
 u_int	window_copy_find_length(struct window *, u_int);
 void	window_copy_move_cursor(struct window *);
 void	window_copy_cursor_bol(struct window *);
 void	window_copy_cursor_eol(struct window *);
 void	window_copy_cursor_left(struct window *);
 void	window_copy_cursor_right(struct window *);
 void	window_copy_cursor_up(struct window *);
 void	window_copy_cursor_down(struct window *);
 void	window_copy_draw_lines(struct window *, u_int, u_int);
 void	window_copy_scroll_left(struct window *, u_int);
 void	window_copy_scroll_right(struct window *, u_int);
 void	window_copy_scroll_up(struct window *, u_int);
 void	window_copy_scroll_down(struct window *, u_int);

 const struct window_mode window_copy_mode = {
 	window_copy_init,
 	window_copy_resize,
 	window_copy_draw,
 	window_copy_key
 };

 struct window_copy_mode_data {
 	u_int	ox;
 	u_int	oy;
 	u_int	cx;
 	u_int	cy;
 	u_int	size;

 	int	selflag;
 	u_int	selx;
 	u_int	sely;
 };

 void
 window_copy_init(struct window *w)
 {
 	struct window_copy_mode_data	*data;

 	w->modedata = data = xmalloc(sizeof *data);
 	data->ox = data->oy = 0;
 	data->cx = w->screen.cx;
 	data->cy = w->screen.cy;
 	data->size = w->screen.hsize;
 	data->selflag = 0;

 	w->screen.mode |= (MODE_BACKGROUND|MODE_BGCURSOR);
 }

 void
 window_copy_resize(unused struct window *w, unused u_int sx, unused u_int sy)
 {
 }

 void
 window_copy_draw_position(struct window *w, struct screen_draw_ctx *ctx)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	char				*ptr, buf[32];
 	size_t	 			 len;

 	len = xsnprintf(
 	    buf, sizeof buf, "[%u,%u/%u]", data->ox, data->oy, data->size);
 	if (len <= screen_size_x(ctx->s))
 		ptr = buf;
 	else {
 		ptr = buf + len - screen_size_x(ctx->s);
 		len -= len - screen_size_x(ctx->s);
 	}

 	screen_draw_cells(ctx, 0, 0, screen_size_x(ctx->s) - len);

 	screen_draw_move_cursor(ctx, screen_size_x(ctx->s) - len, 0);
 	screen_draw_set_attributes(ctx, 0, status_colour);
 	screen_draw_write_string(ctx, "%s", ptr);
 }

 void
 window_copy_draw(
     struct window *w, struct screen_draw_ctx *ctx, u_int py, u_int ny)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	struct screen			*s = &w->screen;

 	if (s->hsize != data->size) {
 		data->oy += s->hsize - data->size;
 		data->size = s->hsize;
 	}
 	screen_draw_set_offset(ctx, data->ox, data->oy);

 	if (py != 0)
 		screen_draw_lines(ctx, py, ny);
 	else {
 		if (ny > 1)
 			screen_draw_lines(ctx, py + 1, ny - 1);
 		window_copy_draw_position(w, ctx);
 	}

 	window_copy_move_cursor(w);
 }

 void
 window_copy_key(struct window *w, int key)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	u_int				 oy, sy;

 	sy = screen_size_y(&w->screen);
 	oy = data->oy;

 	switch (key) {
 	case 'Q':
 	case 'q':
 		goto done;
 	case 'h':
 	case KEYC_LEFT:
 		window_copy_cursor_left(w);
 		return;
 	case 'l':
 	case KEYC_RIGHT:
 		window_copy_cursor_right(w);
  		return;
 	case 'k':
 	case 'K':
 	case KEYC_UP:
 		window_copy_cursor_up(w);
 		return;
 	case 'j':
 	case 'J':
 	case KEYC_DOWN:
 		window_copy_cursor_down(w);
 		return;
 	case '\025':	/* C-u */
 	case KEYC_PPAGE:
 		if (data->oy + sy > data->size)
 			data->oy = data->size;
 		else
 			data->oy += sy;
 		break;
 	case '\006':	/* C-f */
 	case KEYC_NPAGE:
 		if (data->oy < sy)
 			data->oy = 0;
 		else
 			data->oy -= sy;
 		break;
 	case '\000':	/* C-space */
 	case ' ':
 		data->selflag = !data->selflag;
 		data->selx = data->cx + data->ox;
 		data->sely = data->size + data->cy - data->oy;
 		oy = -1;	/* XXX */
 		break;
 	case '\033':
 		data->selflag = 0;
 		oy = -1;	/* XXX */
 		break;
 	case '\027':	/* C-w */
 	case '\r':	/* enter */
 		if (data->selflag)
 			window_copy_copy_selection(w);
 		goto done;
 	case '\001':	/* C-a */
 		window_copy_cursor_bol(w);
 		return;
 	case '\005':	/* C-e */
 		window_copy_cursor_eol(w);
 		return;
 	}
 	if (data->oy != oy) {
 		server_redraw_window(w);
 		window_copy_move_cursor(w);
 	}
 	return;

 done:
 	w->mode = NULL;
 	xfree(w->modedata);

 	w->screen.mode &= ~MODE_BACKGROUND;

 	recalculate_sizes();
 	server_redraw_window(w);
 }

 void
 window_copy_copy_selection(struct window *w)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	char				*buf;
 	size_t	 			 len, off;
 	u_int	 			 i, xx, yy, sx, sy, ex, ey;

 	len = BUFSIZ;
 	buf = xmalloc(len);
 	off = 0;

 	*buf = '\0';

 	/* Find start and end. */
 	xx = data->cx + data->ox;
 	yy = data->size + data->cy - data->oy;
 	if (xx < data->selx || (yy == data->sely && xx < data->selx)) {
 		sx = xx; sy = yy;
 		ex = data->selx; ey = data->sely;
 	} else {
 		sx = data->selx; sy = data->sely;
 		ex = xx; ey = yy;
 	}

 	/* Trim ex to end of line. */
 	xx = window_copy_find_length(w, ey);
 	if (ex > xx)
 		ex = xx;

 	log_debug("copying from %u,%u to %u,%u", sx, sy, ex, ey);

 	/* Copy the lines. */
 	if (sy == ey)
 		window_copy_copy_line(w, &buf, &off, &len, sy, sx, ex);
 	else {
 		xx = window_copy_find_length(w, sy);
 		window_copy_copy_line(w, &buf, &off, &len, sy, sx, xx);
 		if (ey - sy > 1) {
 			for (i = sy + 1; i < ey - 1; i++) {
 				xx = window_copy_find_length(w, i);
 				window_copy_copy_line(
 				    w, &buf, &off, &len, i, 0, xx);
 			}
 		}
 		window_copy_copy_line(w, &buf, &off, &len, ey, 0, ex);
 	}

 	/* Terminate buffer, overwriting final \n. */
 	if (off != 0)
 		buf[off - 1] = '\0';

 	if (paste_buffer != NULL)
 		xfree(paste_buffer);
 	paste_buffer = buf;
 }

 void
 window_copy_copy_line(struct window *w,
     char **buf, size_t *off, size_t *len, u_int sy, u_int sx, u_int ex)
 {
 	struct screen	*s = &w->screen;
 	u_char		 i, xx;

 	if (sx > ex)
 		return;

 	xx = window_copy_find_length(w, sy);
 	if (ex > xx)
 		ex = xx;
 	if (sx > xx)
 		sx = xx;

 	if (sx < ex) {
 		for (i = sx; i < ex; i++) {
 			*buf = ensure_size(*buf, len, 1, *off + 1);
 			(*buf)[*off] = s->grid_data[sy][i];
 			(*off)++;
 		}
 	}

 	*buf = ensure_size(*buf, len, 1, *off + 1);
 	(*buf)[*off] = '\n';
 	(*off)++;
 }

 u_int
 window_copy_find_length(struct window *w, u_int py)
 {
 	struct screen	*s = &w->screen;
 	u_int		 px;

 	px = s->grid_size[py];
 	while (px > 0 && s->grid_data[py][px - 1] == SCREEN_DEFDATA)
 		px--;
 	return (px);
 }

 void
 window_copy_move_cursor(struct window *w)
 {
 	struct window_copy_mode_data	*data = w->modedata;

 	tty_write_window(w, TTY_CURSORMOVE, data->cy, data->cx);
 }

 void
 window_copy_cursor_bol(struct window *w)
 {
 	struct window_copy_mode_data	*data = w->modedata;

 	if (data->ox != 0)
 		window_copy_scroll_right(w, data->ox);
 	data->cx = 0;

 	if (data->selflag)
 		window_copy_draw_lines(w, data->cy, 1);
 	window_copy_move_cursor(w);
 }

 void
 window_copy_cursor_eol(struct window *w)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	struct screen			*s = &w->screen;
 	u_int				 xx;

 	xx = window_copy_find_length(w, data->size + data->cy - data->oy);

 	/* On screen. */
 	if (xx > data->ox && xx < data->ox + screen_last_x(s))
 		data->cx = xx - data->ox;

 	/* Off right of screen. */
 	if (xx > data->ox + screen_last_x(s)) {
 		/* Move cursor to last and scroll screen. */
 		window_copy_scroll_left(w,
 		    xx - data->ox - screen_last_x(s));
 		data->cx = screen_last_x(s);
 	}

 	/* Off left of screen. */
 	if (xx <= data->ox) {
 		if (xx < screen_last_x(s)) {
 			/* Short enough to fit on screen. */
 			window_copy_scroll_right(w, data->ox);
 			data->cx = xx;
 		} else {
 			/* Too long to fit on screen. */
 			window_copy_scroll_right(
 			    w, data->ox - (xx - screen_last_x(s)));
 			data->cx = screen_last_x(s);
 		}
 	}

 	if (data->selflag)
 		window_copy_draw_lines(w, data->cy, 1);
 	window_copy_move_cursor(w);
 }

 void
 window_copy_cursor_left(struct window *w)
 {
 	struct window_copy_mode_data	*data = w->modedata;

 	if (data->cx == 0)
 		window_copy_scroll_right(w, 1);
 	else {
 		data->cx--;
 		if (data->selflag)
 			window_copy_draw_lines(w, data->cy, 1);
 	}
 	window_copy_move_cursor(w);
 }

 void
 window_copy_cursor_right(struct window *w)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	struct screen			*s = &w->screen;

 	if (data->cx == screen_last_x(s))
 		window_copy_scroll_left(w, 1);
 	else {
 		data->cx++;
 		if (data->selflag)
 			window_copy_draw_lines(w, data->cy, 1);
 	}
 	window_copy_move_cursor(w);
 }

 void
 window_copy_cursor_up(struct window *w)
 {
 	struct window_copy_mode_data	*data = w->modedata;

 	if (data->cy == 0)
 		window_copy_scroll_down(w, 1);
 	else {
 		data->cy--;
 		if (data->selflag)
 			window_copy_draw_lines(w, data->cy, 2);
 	}
 	window_copy_move_cursor(w);
 }

 void
 window_copy_cursor_down(struct window *w)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	struct screen			*s = &w->screen;

 	if (data->cy == screen_last_y(s))
 		window_copy_scroll_up(w, 1);
 	else {
 		data->cy++;
 		if (data->selflag)
 			window_copy_draw_lines(w, data->cy - 1, 2);
 	}
 	window_copy_move_cursor(w);
 }

 void
 window_copy_draw_lines(struct window *w, u_int py, u_int ny)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	struct screen_draw_ctx		 ctx;

 	screen_draw_start_window(&ctx, w, data->ox, data->oy);
 	window_copy_draw(w, &ctx, py, ny);
 	screen_draw_stop(&ctx);
 }

 void
 window_copy_scroll_left(struct window *w, u_int nx)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	struct screen_draw_ctx		 ctx;
 	u_int				 i;

 	if (data->ox > SHRT_MAX - nx)
 		nx = SHRT_MAX - data->ox;
 	if (nx == 0)
 		return;
 	data->ox += nx;

 	screen_draw_start_window(&ctx, w, data->ox, data->oy);
 	screen_draw_set_selection(&ctx,
 	    data->selflag, data->selx, data->sely,
 	    data->cx + data->ox, data->size + data->cy - data->oy);
 	for (i = 1; i < screen_size_y(&w->screen); i++) {
 		screen_draw_move_cursor(&ctx, 0, i);
  		screen_draw_delete_characters(&ctx, nx);
 	}
 	for (i = 0; i < nx; i++)
 		screen_draw_column(&ctx, screen_last_x(&w->screen) - i);
 	window_copy_draw_position(w, &ctx);
 	screen_draw_stop(&ctx);
 }

 void
 window_copy_scroll_right(struct window *w, u_int nx)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	struct screen_draw_ctx		 ctx;
 	u_int		 		 i;

 	if (data->ox < nx)
 		nx = data->ox;
 	if (nx == 0)
 		return;
 	data->ox -= nx;

 	screen_draw_start_window(&ctx, w, data->ox, data->oy);
 	screen_draw_set_selection(&ctx,
 	    data->selflag, data->selx, data->sely,
 	    data->cx + data->ox, data->size + data->cy - data->oy);
 	for (i = 1; i < screen_size_y(&w->screen); i++) {
 		screen_draw_move_cursor(&ctx, 0, i);
  		screen_draw_insert_characters(&ctx, nx);
 	}
 	for (i = 0; i < nx; i++)
 		screen_draw_column(&ctx, i);
 	window_copy_draw_position(w, &ctx);
 	screen_draw_stop(&ctx);
 }

 void
 window_copy_scroll_up(struct window *w, u_int ny)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	struct screen_draw_ctx		 ctx;
 	u_int		 		 i;

 	if (data->oy < ny)
 		ny = data->oy;
 	if (ny == 0)
 		return;
 	data->oy -= ny;

 	screen_draw_start_window(&ctx, w, data->ox, data->oy);
 	screen_draw_set_selection(&ctx,
 	    data->selflag, data->selx, data->sely,
 	    data->cx + data->ox, data->size + data->cy - data->oy);
 	screen_draw_move_cursor(&ctx, 0, 0);
 	screen_draw_delete_lines(&ctx, ny);
 	for (i = 0; i < ny; i++)
 		screen_draw_line(&ctx, screen_last_y(&w->screen) - i);
 	if (data->selflag)
 		screen_draw_line(&ctx, screen_last_y(&w->screen) - ny);
 	window_copy_draw_position(w, &ctx);
 	screen_draw_stop(&ctx);
 }

 void
 window_copy_scroll_down(struct window *w, u_int ny)
 {
 	struct window_copy_mode_data	*data = w->modedata;
 	struct screen_draw_ctx		 ctx;
 	u_int		 		 i;

 	if (ny > data->size)
 		return;

 	if (data->oy > data->size - ny)
 		ny = data->size - data->oy;
 	if (ny == 0)
 		return;
 	data->oy += ny;

 	screen_draw_start_window(&ctx, w, data->ox, data->oy);
 	screen_draw_set_selection(&ctx,
 	    data->selflag, data->selx, data->sely,
 	    data->cx + data->ox, data->size + data->cy - data->oy);
 	screen_draw_move_cursor(&ctx, 0, 0);
 	screen_draw_insert_lines(&ctx, ny);
 	for (i = 1; i < ny + 1; i++)
 		screen_draw_line(&ctx, i);
 	window_copy_draw_position(w, &ctx);
 	screen_draw_stop(&ctx);
 }
	/* $Id: window-copy.c,v 1.11 2007-11-27 19:32:15 nicm Exp $ */

	/*
	* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
	*
	* Permission to use, copy, modify, and distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
	* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
	* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*/

	#include <sys/types.h>

	#include <string.h>

	#include "tmux.h"

	void window_copy_init(struct window *);
	void window_copy_resize(struct window *, u_int, u_int);
	void window_copy_draw(
	struct window , struct screen_draw_ctx , u_int, u_int);
	void window_copy_key(struct window *, int);

	void window_copy_draw_position(struct window , struct screen_draw_ctx );

	void window_copy_copy_selection(struct window *);
	void window_copy_copy_line(
	struct window , char , size_t , size_t *, u_int, u_int, u_int);
	u_int window_copy_find_length(struct window *, u_int);
	void window_copy_move_cursor(struct window *);
	void window_copy_cursor_bol(struct window *);
	void window_copy_cursor_eol(struct window *);
	void window_copy_cursor_left(struct window *);
	void window_copy_cursor_right(struct window *);
	void window_copy_cursor_up(struct window *);
	void window_copy_cursor_down(struct window *);
	void window_copy_draw_lines(struct window *, u_int, u_int);
	void window_copy_scroll_left(struct window *, u_int);
	void window_copy_scroll_right(struct window *, u_int);
	void window_copy_scroll_up(struct window *, u_int);
	void window_copy_scroll_down(struct window *, u_int);

	const struct window_mode window_copy_mode = {
	window_copy_init,
	window_copy_resize,
	window_copy_draw,
	window_copy_key
	};

	struct window_copy_mode_data {
	u_int ox;
	u_int oy;
	u_int cx;
	u_int cy;
	u_int size;

	int selflag;
	u_int selx;
	u_int sely;
	};

	void
	window_copy_init(struct window *w)
	{
	struct window_copy_mode_data *data;

	w->modedata = data = xmalloc(sizeof *data);
	data->ox = data->oy = 0;
	data->cx = w->screen.cx;
	data->cy = w->screen.cy;
	data->size = w->screen.hsize;
	data->selflag = 0;

	w->screen.mode \|= (MODE_BACKGROUND\|MODE_BGCURSOR);
	}

	void
	window_copy_resize(unused struct window *w, unused u_int sx, unused u_int sy)
	{
	}

	void
	window_copy_draw_position(struct window w, struct screen_draw_ctx ctx)
	{
	struct window_copy_mode_data *data = w->modedata;
	char *ptr, buf[32];
	size_t len;

	len = xsnprintf(
	buf, sizeof buf, "[%u,%u/%u]", data->ox, data->oy, data->size);
	if (len <= screen_size_x(ctx->s))
	ptr = buf;
	else {
	ptr = buf + len - screen_size_x(ctx->s);
	len -= len - screen_size_x(ctx->s);
	}

	screen_draw_cells(ctx, 0, 0, screen_size_x(ctx->s) - len);

	screen_draw_move_cursor(ctx, screen_size_x(ctx->s) - len, 0);
	screen_draw_set_attributes(ctx, 0, status_colour);
	screen_draw_write_string(ctx, "%s", ptr);
	}

	void
	window_copy_draw(
	struct window w, struct screen_draw_ctx ctx, u_int py, u_int ny)
	{
	struct window_copy_mode_data *data = w->modedata;
	struct screen *s = &w->screen;

	if (s->hsize != data->size) {
	data->oy += s->hsize - data->size;
	data->size = s->hsize;
	}
	screen_draw_set_offset(ctx, data->ox, data->oy);

	if (py != 0)
	screen_draw_lines(ctx, py, ny);
	else {
	if (ny > 1)
	screen_draw_lines(ctx, py + 1, ny - 1);
	window_copy_draw_position(w, ctx);
	}

	window_copy_move_cursor(w);
	}

	void
	window_copy_key(struct window *w, int key)
	{
	struct window_copy_mode_data *data = w->modedata;
	u_int oy, sy;

	sy = screen_size_y(&w->screen);
	oy = data->oy;

	switch (key) {
	case 'Q':
	case 'q':
	goto done;
	case 'h':
	case KEYC_LEFT:
	window_copy_cursor_left(w);
	return;
	case 'l':
	case KEYC_RIGHT:
	window_copy_cursor_right(w);
	return;
	case 'k':
	case 'K':
	case KEYC_UP:
	window_copy_cursor_up(w);
	return;
	case 'j':
	case 'J':
	case KEYC_DOWN:
	window_copy_cursor_down(w);
	return;
	case '\025': /* C-u */
	case KEYC_PPAGE:
	if (data->oy + sy > data->size)
	data->oy = data->size;
	else
	data->oy += sy;
	break;
	case '\006': /* C-f */
	case KEYC_NPAGE:
	if (data->oy < sy)
	data->oy = 0;
	else
	data->oy -= sy;
	break;
	case '\000': /* C-space */
	case ' ':
	data->selflag = !data->selflag;
	data->selx = data->cx + data->ox;
	data->sely = data->size + data->cy - data->oy;
	oy = -1; /* XXX */
	break;
	case '\033':
	data->selflag = 0;
	oy = -1; /* XXX */
	break;
	case '\027': /* C-w */
	case '\r': /* enter */
	if (data->selflag)
	window_copy_copy_selection(w);
	goto done;
	case '\001': /* C-a */
	window_copy_cursor_bol(w);
	return;
	case '\005': /* C-e */
	window_copy_cursor_eol(w);
	return;
	}
	if (data->oy != oy) {
	server_redraw_window(w);
	window_copy_move_cursor(w);
	}
	return;

	done:
	w->mode = NULL;
	xfree(w->modedata);

	w->screen.mode &= ~MODE_BACKGROUND;

	recalculate_sizes();
	server_redraw_window(w);
	}

	void
	window_copy_copy_selection(struct window *w)
	{
	struct window_copy_mode_data *data = w->modedata;
	char *buf;
	size_t len, off;
	u_int i, xx, yy, sx, sy, ex, ey;

	len = BUFSIZ;
	buf = xmalloc(len);
	off = 0;

	*buf = '\0';

	/* Find start and end. */
	xx = data->cx + data->ox;
	yy = data->size + data->cy - data->oy;
	if (xx < data->selx \|\| (yy == data->sely && xx < data->selx)) {
	sx = xx; sy = yy;
	ex = data->selx; ey = data->sely;
	} else {
	sx = data->selx; sy = data->sely;
	ex = xx; ey = yy;
	}

	/* Trim ex to end of line. */
	xx = window_copy_find_length(w, ey);
	if (ex > xx)
	ex = xx;

	log_debug("copying from %u,%u to %u,%u", sx, sy, ex, ey);

	/* Copy the lines. */
	if (sy == ey)
	window_copy_copy_line(w, &buf, &off, &len, sy, sx, ex);
	else {
	xx = window_copy_find_length(w, sy);
	window_copy_copy_line(w, &buf, &off, &len, sy, sx, xx);
	if (ey - sy > 1) {
	for (i = sy + 1; i < ey - 1; i++) {
	xx = window_copy_find_length(w, i);
	window_copy_copy_line(
	w, &buf, &off, &len, i, 0, xx);
	}
	}
	window_copy_copy_line(w, &buf, &off, &len, ey, 0, ex);
	}

	/* Terminate buffer, overwriting final \n. */
	if (off != 0)
	buf[off - 1] = '\0';

	if (paste_buffer != NULL)
	xfree(paste_buffer);
	paste_buffer = buf;
	}

	void
	window_copy_copy_line(struct window *w,
	char *buf, size_t off, size_t *len, u_int sy, u_int sx, u_int ex)
	{
	struct screen *s = &w->screen;
	u_char i, xx;

	if (sx > ex)
	return;

	xx = window_copy_find_length(w, sy);
	if (ex > xx)
	ex = xx;
	if (sx > xx)
	sx = xx;

	if (sx < ex) {
	for (i = sx; i < ex; i++) {
	buf = ensure_size(buf, len, 1, *off + 1);
	(buf)[off] = s->grid_data[sy][i];
	(*off)++;
	}
	}

	buf = ensure_size(buf, len, 1, *off + 1);
	(buf)[off] = '\n';
	(*off)++;
	}

	u_int
	window_copy_find_length(struct window *w, u_int py)
	{
	struct screen *s = &w->screen;
	u_int px;

	px = s->grid_size[py];
	while (px > 0 && s->grid_data[py][px - 1] == SCREEN_DEFDATA)
	px--;
	return (px);
	}

	void
	window_copy_move_cursor(struct window *w)
	{
	struct window_copy_mode_data *data = w->modedata;

	tty_write_window(w, TTY_CURSORMOVE, data->cy, data->cx);
	}

	void
	window_copy_cursor_bol(struct window *w)
	{
	struct window_copy_mode_data *data = w->modedata;

	if (data->ox != 0)
	window_copy_scroll_right(w, data->ox);
	data->cx = 0;

	if (data->selflag)
	window_copy_draw_lines(w, data->cy, 1);
	window_copy_move_cursor(w);
	}

	void
	window_copy_cursor_eol(struct window *w)
	{
	struct window_copy_mode_data *data = w->modedata;
	struct screen *s = &w->screen;
	u_int xx;

	xx = window_copy_find_length(w, data->size + data->cy - data->oy);

	/* On screen. */
	if (xx > data->ox && xx < data->ox + screen_last_x(s))
	data->cx = xx - data->ox;

	/* Off right of screen. */
	if (xx > data->ox + screen_last_x(s)) {
	/* Move cursor to last and scroll screen. */
	window_copy_scroll_left(w,
	xx - data->ox - screen_last_x(s));
	data->cx = screen_last_x(s);
	}

	/* Off left of screen. */
	if (xx <= data->ox) {
	if (xx < screen_last_x(s)) {
	/* Short enough to fit on screen. */
	window_copy_scroll_right(w, data->ox);
	data->cx = xx;
	} else {
	/* Too long to fit on screen. */
	window_copy_scroll_right(
	w, data->ox - (xx - screen_last_x(s)));
	data->cx = screen_last_x(s);
	}
	}

	if (data->selflag)
	window_copy_draw_lines(w, data->cy, 1);
	window_copy_move_cursor(w);
	}

	void
	window_copy_cursor_left(struct window *w)
	{
	struct window_copy_mode_data *data = w->modedata;

	if (data->cx == 0)
	window_copy_scroll_right(w, 1);
	else {
	data->cx--;
	if (data->selflag)
	window_copy_draw_lines(w, data->cy, 1);
	}
	window_copy_move_cursor(w);
	}

	void
	window_copy_cursor_right(struct window *w)
	{
	struct window_copy_mode_data *data = w->modedata;
	struct screen *s = &w->screen;

	if (data->cx == screen_last_x(s))
	window_copy_scroll_left(w, 1);
	else {
	data->cx++;
	if (data->selflag)
	window_copy_draw_lines(w, data->cy, 1);
	}
	window_copy_move_cursor(w);
	}

	void
	window_copy_cursor_up(struct window *w)
	{
	struct window_copy_mode_data *data = w->modedata;

	if (data->cy == 0)
	window_copy_scroll_down(w, 1);
	else {
	data->cy--;
	if (data->selflag)
	window_copy_draw_lines(w, data->cy, 2);
	}
	window_copy_move_cursor(w);
	}

	void
	window_copy_cursor_down(struct window *w)
	{
	struct window_copy_mode_data *data = w->modedata;
	struct screen *s = &w->screen;

	if (data->cy == screen_last_y(s))
	window_copy_scroll_up(w, 1);
	else {
	data->cy++;
	if (data->selflag)
	window_copy_draw_lines(w, data->cy - 1, 2);
	}
	window_copy_move_cursor(w);
	}

	void
	window_copy_draw_lines(struct window *w, u_int py, u_int ny)
	{
	struct window_copy_mode_data *data = w->modedata;
	struct screen_draw_ctx ctx;

	screen_draw_start_window(&ctx, w, data->ox, data->oy);
	window_copy_draw(w, &ctx, py, ny);
	screen_draw_stop(&ctx);
	}

	void
	window_copy_scroll_left(struct window *w, u_int nx)
	{
	struct window_copy_mode_data *data = w->modedata;
	struct screen_draw_ctx ctx;
	u_int i;

	if (data->ox > SHRT_MAX - nx)
	nx = SHRT_MAX - data->ox;
	if (nx == 0)
	return;
	data->ox += nx;

	screen_draw_start_window(&ctx, w, data->ox, data->oy);
	screen_draw_set_selection(&ctx,
	data->selflag, data->selx, data->sely,
	data->cx + data->ox, data->size + data->cy - data->oy);
	for (i = 1; i < screen_size_y(&w->screen); i++) {
	screen_draw_move_cursor(&ctx, 0, i);
	screen_draw_delete_characters(&ctx, nx);
	}
	for (i = 0; i < nx; i++)
	screen_draw_column(&ctx, screen_last_x(&w->screen) - i);
	window_copy_draw_position(w, &ctx);
	screen_draw_stop(&ctx);
	}

	void
	window_copy_scroll_right(struct window *w, u_int nx)
	{
	struct window_copy_mode_data *data = w->modedata;
	struct screen_draw_ctx ctx;
	u_int i;

	if (data->ox < nx)
	nx = data->ox;
	if (nx == 0)
	return;
	data->ox -= nx;

	screen_draw_start_window(&ctx, w, data->ox, data->oy);
	screen_draw_set_selection(&ctx,
	data->selflag, data->selx, data->sely,
	data->cx + data->ox, data->size + data->cy - data->oy);
	for (i = 1; i < screen_size_y(&w->screen); i++) {
	screen_draw_move_cursor(&ctx, 0, i);
	screen_draw_insert_characters(&ctx, nx);
	}
	for (i = 0; i < nx; i++)
	screen_draw_column(&ctx, i);
	window_copy_draw_position(w, &ctx);
	screen_draw_stop(&ctx);
	}

	void
	window_copy_scroll_up(struct window *w, u_int ny)
	{
	struct window_copy_mode_data *data = w->modedata;
	struct screen_draw_ctx ctx;
	u_int i;

	if (data->oy < ny)
	ny = data->oy;
	if (ny == 0)
	return;
	data->oy -= ny;

	screen_draw_start_window(&ctx, w, data->ox, data->oy);
	screen_draw_set_selection(&ctx,
	data->selflag, data->selx, data->sely,
	data->cx + data->ox, data->size + data->cy - data->oy);
	screen_draw_move_cursor(&ctx, 0, 0);
	screen_draw_delete_lines(&ctx, ny);
	for (i = 0; i < ny; i++)
	screen_draw_line(&ctx, screen_last_y(&w->screen) - i);
	if (data->selflag)
	screen_draw_line(&ctx, screen_last_y(&w->screen) - ny);
	window_copy_draw_position(w, &ctx);
	screen_draw_stop(&ctx);
	}

	void
	window_copy_scroll_down(struct window *w, u_int ny)
	{
	struct window_copy_mode_data *data = w->modedata;
	struct screen_draw_ctx ctx;
	u_int i;

	if (ny > data->size)
	return;

	if (data->oy > data->size - ny)
	ny = data->size - data->oy;
	if (ny == 0)
	return;
	data->oy += ny;

	screen_draw_start_window(&ctx, w, data->ox, data->oy);
	screen_draw_set_selection(&ctx,
	data->selflag, data->selx, data->sely,
	data->cx + data->ox, data->size + data->cy - data->oy);
	screen_draw_move_cursor(&ctx, 0, 0);
	screen_draw_insert_lines(&ctx, ny);
	for (i = 1; i < ny + 1; i++)
	screen_draw_line(&ctx, i);
	window_copy_draw_position(w, &ctx);
	screen_draw_stop(&ctx);
	}