1 files changed, 497 insertions, 0 deletions
diff --git a/usr.bin/tmux/grid.c b/usr.bin/tmux/grid.c
new file mode 100644
index 00000000000..0e90df3441f
--- /dev/null
+++ b/usr.bin/tmux/grid.c
@@ -0,0 +1,497 @@
+/* $OpenBSD: grid.c,v 1.1 2009/06/01 22:58:49 nicm Exp $ */
+
+/*
+ * Copyright (c) 2008 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"
+
+/*
+ * Grid data. This is the basic data structure that represents what is shown on
+ * screen.
+ *
+ * A grid is a grid of cells (struct grid_cell). Lines are not allocated until
+ * cells in that line are written to. The grid is split into history and
+ * viewable data with the history starting at row (line) 0 and extending to
+ * (hsize - 1); from hsize to hsize + (sy - 1) is the viewable data. All
+ * functions in this file work on absolute coordinates, grid-view.c has
+ * functions which work on the screen data.
+ */
+
+/* Default grid cell data. */
+const struct grid_cell grid_default_cell = { 0, 0, 8, 8, ' ' };
+
+#define grid_put_cell(gd, px, py, gc) do {			\
+	memcpy(&gd->data[py][px], gc, sizeof gd->data[py][px]);	\
+} while (0)
+#define grid_put_utf8(gd, px, py, gc) do {			\
+	memcpy(&gd->udata[py][px], gc, sizeof gd->udata[py][px]); \
+} while (0)
+
+int	grid_check_x(struct grid *, u_int);
+int	grid_check_y(struct grid *, u_int);
+
+#ifdef DEBUG
+int
+grid_check_x(struct grid *gd, u_int px)
+{
+	if ((px) >= (gd)->sx)
+		log_fatalx("x out of range: %u", px);
+	return (0);
+}
+
+int
+grid_check_y(struct grid *gd, u_int py)
+{
+	if ((py) >= (gd)->hsize + (gd)->sy)
+		log_fatalx("y out of range: %u", py);
+	return (0);
+}
+#else
+int
+grid_check_x(struct grid *gd, u_int px)
+{
+	if ((px) >= (gd)->sx) {
+		log_debug("x out of range: %u", px);
+		return (-1);
+	}
+	return (0);
+}
+
+int
+grid_check_y(struct grid *gd, u_int py)
+{
+	if ((py) >= (gd)->hsize + (gd)->sy) {
+		log_debug("y out of range: %u", py);
+		return (-1);
+	}
+	return (0);
+}
+#endif
+
+/* Create a new grid. */
+struct grid *
+grid_create(u_int sx, u_int sy, u_int hlimit)
+{
+	struct grid	*gd;
+
+	gd = xmalloc(sizeof *gd);
+	gd->sx = sx;
+	gd->sy = sy;
+
+	gd->hsize = 0;
+	gd->hlimit = hlimit;
+
+	gd->size = xcalloc(gd->sy, sizeof *gd->size);
+	gd->data = xcalloc(gd->sy, sizeof *gd->data);
+
+	gd->usize = xcalloc(gd->sy, sizeof *gd->usize);
+	gd->udata = xcalloc(gd->sy, sizeof *gd->udata);
+
+	return (gd);
+}
+
+/* Destroy grid. */
+void
+grid_destroy(struct grid *gd)
+{
+	u_int	yy;
+
+	for (yy = 0; yy < gd->hsize + gd->sy; yy++) {
+		if (gd->udata[yy] != NULL)
+			xfree(gd->udata[yy]);
+		if (gd->data[yy] != NULL)
+			xfree(gd->data[yy]);
+	}
+
+	if (gd->udata != NULL)
+		xfree(gd->udata);
+	if (gd->usize != NULL)
+		xfree(gd->usize);
+
+	if (gd->data != NULL)
+		xfree(gd->data);
+	if (gd->size != NULL)
+		xfree(gd->size);
+
+	xfree(gd);
+}
+
+/* Compare grids. */
+int
+grid_compare(struct grid *ga, struct grid *gb)
+{
+	struct grid_cell	*gca, *gcb;
+	struct grid_utf8	*gua, *gub;
+	u_int			 xx, yy;
+
+	if (ga->sx != gb->sx || ga->sy != ga->sy)
+		return (1);
+
+	for (yy = 0; yy < ga->sy; yy++) {
+		if (ga->size[yy] != gb->size[yy])
+			return (1);
+		for (xx = 0; xx < ga->sx; xx++) {
+			gca = &ga->data[yy][xx];
+			gcb = &gb->data[yy][xx];
+			if (memcmp(gca, gcb, sizeof (struct grid_cell)) != 0)
+				return (1);
+			if (!(gca->flags & GRID_FLAG_UTF8))
+				continue;
+			gua = &ga->udata[yy][xx];
+			gub = &gb->udata[yy][xx];
+			if (memcmp(gua, gub, sizeof (struct grid_utf8)) != 0)
+				return (1);
+		}
+	}
+
+	return (0);
+}
+
+/* Scroll a line into the history. */
+void
+grid_scroll_line(struct grid *gd)
+{
+	u_int	yy;
+
+ 	GRID_DEBUG(gd, "");
+
+	if (gd->hsize >= gd->hlimit - 1) {
+		/* If the limit is hit, free the bottom 10% and shift up. */
+		yy = gd->hlimit / 10;
+		if (yy < 1)
+			yy = 1;
+
+		grid_move_lines(gd, 0, yy, gd->hsize + gd->sy - yy);
+		gd->hsize -= yy;
+	}
+
+	yy = gd->hsize + gd->sy;
+
+	gd->size = xrealloc(gd->size, yy + 1, sizeof *gd->size);
+	gd->size[yy] = 0;
+	gd->data = xrealloc(gd->data, yy + 1, sizeof *gd->data);
+	gd->data[yy] = NULL;
+
+	gd->usize = xrealloc(gd->usize, yy + 1, sizeof *gd->usize);
+	gd->usize[yy] = 0;
+	gd->udata = xrealloc(gd->udata, yy + 1, sizeof *gd->udata);
+	gd->udata[yy] = NULL;
+
+	gd->hsize++;
+}
+
+/* Reduce line to fit to cell. */
+void
+grid_reduce_line(struct grid *gd, u_int py, u_int sx)
+{
+	if (sx < gd->size[py]) {
+		gd->data[py] = xrealloc(gd->data[py], sx, sizeof **gd->data);
+		gd->size[py] = sx;
+	}
+	if (sx < gd->usize[py]) {
+		gd->udata[py] = xrealloc(gd->udata[py], sx, sizeof **gd->udata);
+		gd->usize[py] = sx;
+	}
+}
+
+/* Expand line to fit to cell. */
+void
+grid_expand_line(struct grid *gd, u_int py, u_int sx)
+{
+	u_int	xx;
+
+	if (sx <= gd->size[py])
+		return;
+
+	gd->data[py] = xrealloc(gd->data[py], sx, sizeof **gd->data);
+	for (xx = gd->size[py]; xx < sx; xx++)
+		grid_put_cell(gd, xx, py, &grid_default_cell);
+	gd->size[py] = sx;
+}
+
+/* Expand line to fit to cell for UTF-8. */
+void
+grid_expand_line_utf8(struct grid *gd, u_int py, u_int sx)
+{
+	if (sx <= gd->usize[py])
+		return;
+
+	gd->udata[py] = xrealloc(gd->udata[py], sx, sizeof **gd->udata);
+	gd->usize[py] = sx;
+}
+
+/* Get cell for reading. */
+const struct grid_cell *
+grid_peek_cell(struct grid *gd, u_int px, u_int py)
+{
+	if (grid_check_x(gd, px) != 0)
+		return (&grid_default_cell);
+	if (grid_check_y(gd, py) != 0)
+		return (&grid_default_cell);
+
+	if (px >= gd->size[py])
+		return (&grid_default_cell);
+	return (&gd->data[py][px]);
+}
+
+/* Get cell at relative position (for writing). */
+struct grid_cell *
+grid_get_cell(struct grid *gd, u_int px, u_int py)
+{
+	if (grid_check_x(gd, px) != 0)
+		return (NULL);
+	if (grid_check_y(gd, py) != 0)
+		return (NULL);
+
+	grid_expand_line(gd, py, px + 1);
+	return (&gd->data[py][px]);
+}
+
+/* Set cell at relative position. */
+void
+grid_set_cell(
+    struct grid *gd, u_int px, u_int py, const struct grid_cell *gc)
+{
+	if (grid_check_x(gd, px) != 0)
+		return;
+	if (grid_check_y(gd, py) != 0)
+		return;
+
+	grid_expand_line(gd, py, px + 1);
+	grid_put_cell(gd, px, py, gc);
+}
+
+/* Get UTF-8 for reading. */
+const struct grid_utf8 *
+grid_peek_utf8(struct grid *gd, u_int px, u_int py)
+{
+	if (grid_check_x(gd, px) != 0)
+		return (NULL);
+	if (grid_check_y(gd, py) != 0)
+		return (NULL);
+
+	if (px >= gd->usize[py])
+		return (NULL);
+	return (&gd->udata[py][px]);
+}
+
+/* Get utf8 at relative position (for writing). */
+struct grid_utf8 *
+grid_get_utf8(struct grid *gd, u_int px, u_int py)
+{
+	if (grid_check_x(gd, px) != 0)
+		return (NULL);
+	if (grid_check_y(gd, py) != 0)
+		return (NULL);
+
+	grid_expand_line_utf8(gd, py, px + 1);
+	return (&gd->udata[py][px]);
+}
+
+/* Set utf8 at relative position. */
+void
+grid_set_utf8(
+    struct grid *gd, u_int px, u_int py, const struct grid_utf8 *gc)
+{
+	if (grid_check_x(gd, px) != 0)
+		return;
+	if (grid_check_y(gd, py) != 0)
+		return;
+
+	grid_expand_line_utf8(gd, py, px + 1);
+	grid_put_utf8(gd, px, py, gc);
+}
+
+/*
+ * Clear area. Note this is different from a fill as it just omits unallocated
+ * cells.
+ */
+void
+grid_clear(struct grid *gd, u_int px, u_int py, u_int nx, u_int ny)
+{
+	u_int	xx, yy;
+
+ 	GRID_DEBUG(gd, "px=%u, py=%u, nx=%u, ny=%u", px, py, nx, ny);
+
+	if (nx == 0 || ny == 0)
+		return;
+
+	if (px == 0 && nx == gd->sx) {
+		grid_clear_lines(gd, py, ny);
+		return;
+	}
+
+	if (grid_check_x(gd, px) != 0)
+		return;
+	if (grid_check_x(gd, px + nx - 1) != 0)
+		return;
+	if (grid_check_y(gd, py) != 0)
+		return;
+	if (grid_check_y(gd, py + ny - 1) != 0)
+		return;
+
+	for (yy = py; yy < py + ny; yy++) {
+		for (xx = px; xx < px + nx; xx++) {
+			if (xx >= gd->size[yy])
+				break;
+			grid_put_cell(gd, xx, yy, &grid_default_cell);
+		}
+	}
+}
+
+/* Clear lines. This just frees and truncates the lines. */
+void
+grid_clear_lines(struct grid *gd, u_int py, u_int ny)
+{
+	u_int	yy;
+
+ 	GRID_DEBUG(gd, "py=%u, ny=%u", py, ny);
+
+	if (ny == 0)
+		return;
+
+	if (grid_check_y(gd, py) != 0)
+		return;
+	if (grid_check_y(gd, py + ny - 1) != 0)
+		return;
+
+	for (yy = py; yy < py + ny; yy++) {
+		if (gd->data[yy] != NULL) {
+			xfree(gd->data[yy]);
+			gd->data[yy] = NULL;
+			gd->size[yy] = 0;
+		}
+		if (gd->udata[yy] != NULL) {
+			xfree(gd->udata[yy]);
+			gd->udata[yy] = NULL;
+			gd->usize[yy] = 0;
+		}
+	}
+}
+
+/* Move a group of lines. */
+void
+grid_move_lines(struct grid *gd, u_int dy, u_int py, u_int ny)
+{
+	u_int	yy;
+
+ 	GRID_DEBUG(gd, "dy=%u, py=%u, ny=%u", dy, py, ny);
+
+	if (ny == 0 || py == dy)
+		return;
+
+	if (grid_check_y(gd, py) != 0)
+		return;
+	if (grid_check_y(gd, py + ny - 1) != 0)
+		return;
+	if (grid_check_y(gd, dy) != 0)
+		return;
+	if (grid_check_y(gd, dy + ny - 1) != 0)
+		return;
+
+	/* Free any lines which are being replaced. */
+	for (yy = dy; yy < dy + ny; yy++) {
+		if (yy >= py && yy < py + ny)
+			continue;
+		grid_clear_lines(gd, yy, 1);
+	}
+
+	memmove(&gd->data[dy], &gd->data[py], ny * (sizeof *gd->data));
+	memmove(&gd->size[dy], &gd->size[py], ny * (sizeof *gd->size));
+
+	memmove(&gd->udata[dy], &gd->udata[py], ny * (sizeof *gd->udata));
+	memmove(&gd->usize[dy], &gd->usize[py], ny * (sizeof *gd->usize));
+
+	/* Wipe any lines that have been moved (without freeing them). */
+	for (yy = py; yy < py + ny; yy++) {
+		if (yy >= dy && yy < dy + ny)
+			continue;
+		gd->data[yy] = NULL;
+		gd->size[yy] = 0;
+		gd->udata[yy] = NULL;
+		gd->usize[yy] = 0;
+	}
+}
+
+/* Clear a group of cells. */
+void
+grid_clear_cells(struct grid *gd, u_int px, u_int py, u_int nx)
+{
+	u_int	xx;
+
+ 	GRID_DEBUG(gd, "px=%u, py=%u, nx=%u", px, py, nx);
+
+	if (nx == 0)
+		return;
+
+	if (grid_check_x(gd, px) != 0)
+		return;
+	if (grid_check_x(gd, px + nx - 1) != 0)
+		return;
+	if (grid_check_y(gd, py) != 0)
+		return;
+
+	for (xx = px; xx < px + nx; xx++) {
+		if (xx >= gd->size[py])
+			break;
+		grid_put_cell(gd, xx, py, &grid_default_cell);
+	}
+}
+
+/* Move a group of cells. */
+void
+grid_move_cells(struct grid *gd, u_int dx, u_int px, u_int py, u_int nx)
+{
+	u_int	xx;
+
+ 	GRID_DEBUG(gd, "dx=%u, px=%u, py=%u, nx=%u", dx, px, py, nx);
+
+	if (nx == 0 || px == dx)
+		return;
+
+	if (grid_check_x(gd, px) != 0)
+		return;
+	if (grid_check_x(gd, px + nx - 1) != 0)
+		return;
+	if (grid_check_x(gd, dx + nx - 1) != 0)
+		return;
+	if (grid_check_y(gd, py) != 0)
+		return;
+
+	grid_expand_line(gd, py, px + nx);
+	grid_expand_line(gd, py, dx + nx);
+	memmove(&gd->data[py][dx], &gd->data[py][px], nx * (sizeof **gd->data));
+
+	if (gd->udata[py] != NULL) {
+		grid_expand_line_utf8(gd, py, px + nx);
+		grid_expand_line_utf8(gd, py, dx + nx);
+		memmove(&gd->udata[py][dx],
+		    &gd->udata[py][px], nx * (sizeof **gd->udata));
+	}
+
+	/* Wipe any cells that have been moved. */
+	for (xx = px; xx < px + nx; xx++) {
+		if (xx >= dx && xx < dx + nx)
+			continue;
+		grid_put_cell(gd, xx, py, &grid_default_cell);
+	}
+}
+
+