/src/tmux/grid.c

Source
/* $OpenBSD: grid.c,v 1.153 2026/07/02 08:51:05 nicm Exp $ */

/*
 * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * 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>

#ifdef __APPLE__
#include <assert.h>
#endif
#include <stdlib.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, 1, 1 }, 0, 0, 8, 8, 8, 0
};

/*
 * Padding grid cell data. Padding cells are the only zero width cell that
 * appears in the grid - because of this, they are always extended cells.
 */
static const struct grid_cell grid_padding_cell = {
  { { '!' }, 0, 0, 0 }, 0, GRID_FLAG_PADDING, 8, 8, 8, 0
};

/* Cleared grid cell data. */
static const struct grid_cell grid_cleared_cell = {
  { { ' ' }, 0, 1, 1 }, 0, GRID_FLAG_CLEARED, 8, 8, 8, 0
};
static const struct grid_cell_entry grid_cleared_entry = {
  { .data = { 0, 8, 8, ' ' } }, GRID_FLAG_CLEARED
};

#ifdef __APPLE__
void
grid_check_is_clear(struct grid *gd)
{
  struct grid_line  *gl;
  u_int      yy, ny;

  assert(gd != NULL);

  if (gd->sy == 0) {
    assert(gd->linedata == NULL);
    return;
  }

  assert(gd->linedata != NULL);

  ny = gd->hsize + gd->sy;
  for (yy = 0; yy < ny; yy++) {
    gl = &gd->linedata[yy];

    assert(gl->celldata == NULL);
    assert(gl->cellused == 0);
    assert(gl->cellsize == 0);
    assert(gl->extddata == NULL);
    assert(gl->extdsize == 0);
    assert(gl->flags == 0);
    assert(gl->time == 0);
  }
}
#else
void
grid_check_is_clear(__unused struct grid *gd)
{
}
#endif

/* Store cell in entry. */
static void
grid_store_cell(struct grid_cell_entry *gce, const struct grid_cell *gc,
    u_char c)
{
  gce->flags = (gc->flags & ~GRID_FLAG_CLEARED);

  gce->data.fg = gc->fg & 0xff;
  if (gc->fg & COLOUR_FLAG_256)
    gce->flags |= GRID_FLAG_FG256;

  gce->data.bg = gc->bg & 0xff;
  if (gc->bg & COLOUR_FLAG_256)
    gce->flags |= GRID_FLAG_BG256;

  gce->data.attr = gc->attr;
  gce->data.data = c;
}

/* Check if a cell should be an extended cell. */
static int
grid_need_extended_cell(const struct grid_cell_entry *gce,
    const struct grid_cell *gc)
{
  if (gce->flags & GRID_FLAG_EXTENDED)
    return (1);
  if (gc->attr > 0xff)
    return (1);
  if (gc->data.size > 1 || gc->data.width > 1)
    return (1);
  if ((gc->fg & (COLOUR_FLAG_RGB|COLOUR_FLAG_THEME)) ||
      (gc->bg & (COLOUR_FLAG_RGB|COLOUR_FLAG_THEME)))
    return (1);
  if (gc->us != 8) /* only supports 256 or RGB */
    return (1);
  if (gc->link != 0)
    return (1);
  if (gc->flags & GRID_FLAG_TAB)
    return (1);
  return (0);
}

/* Get an extended cell. */
static void
grid_get_extended_cell(struct grid_line *gl, struct grid_cell_entry *gce,
    int flags)
{
  u_int at = gl->extdsize + 1;

  gl->extddata = xreallocarray(gl->extddata, at, sizeof *gl->extddata);
  gl->extdsize = at;

  gce->offset = at - 1;
  gce->flags = (flags | GRID_FLAG_EXTENDED);
}

/* Set cell as extended. */
static struct grid_extd_entry *
grid_extended_cell(struct grid_line *gl, struct grid_cell_entry *gce,
    const struct grid_cell *gc)
{
  struct grid_extd_entry  *gee;
  int      flags = (gc->flags & ~GRID_FLAG_CLEARED);
  utf8_char    uc;

  if (~gce->flags & GRID_FLAG_EXTENDED)
    grid_get_extended_cell(gl, gce, flags);
  else if (gce->offset >= gl->extdsize)
    fatalx("offset too big");
  gl->flags |= GRID_LINE_EXTENDED;
  if (gc->link != 0)
    gl->flags |= GRID_LINE_HYPERLINK;

  if (gc->flags & GRID_FLAG_TAB)
    uc = gc->data.width;
  else
    utf8_from_data(&gc->data, &uc);

  gee = &gl->extddata[gce->offset];
  gee->data = uc;
  gee->attr = gc->attr;
  gee->flags = flags;
  gee->fg = gc->fg;
  gee->bg = gc->bg;
  gee->us = gc->us;
  gee->link = gc->link;
  return (gee);
}

/* Free up unused extended cells. */
static void
grid_compact_line(struct grid_line *gl)
{
  int      new_extdsize = 0;
  struct grid_extd_entry  *new_extddata;
  struct grid_cell_entry  *gce;
  struct grid_extd_entry  *gee;
  u_int      px, idx;

  if (gl->extdsize == 0)
    return;

  for (px = 0; px < gl->cellsize; px++) {
    gce = &gl->celldata[px];
    if (gce->flags & GRID_FLAG_EXTENDED)
      new_extdsize++;
  }

  if (new_extdsize == 0) {
    free(gl->extddata);
    gl->extddata = NULL;
    gl->extdsize = 0;
    return;
  }
  new_extddata = xreallocarray(NULL, new_extdsize, sizeof *gl->extddata);

  idx = 0;
  for (px = 0; px < gl->cellsize; px++) {
    gce = &gl->celldata[px];
    if (gce->flags & GRID_FLAG_EXTENDED) {
      gee = &gl->extddata[gce->offset];
      memcpy(&new_extddata[idx], gee, sizeof *gee);
      gce->offset = idx++;
    }
  }

  free(gl->extddata);
  gl->extddata = new_extddata;
  gl->extdsize = new_extdsize;
}

/* Get line data. */
struct grid_line *
grid_get_line(struct grid *gd, u_int line)
{
  return (&gd->linedata[line]);
}

/* Adjust number of lines. */
void
grid_adjust_lines(struct grid *gd, u_int lines)
{
  gd->linedata = xreallocarray(gd->linedata, lines, sizeof *gd->linedata);
}

/* Copy default into a cell. */
static void
grid_clear_cell(struct grid *gd, u_int px, u_int py, u_int bg, int moved)
{
  struct grid_line  *gl = &gd->linedata[py];
  struct grid_cell_entry  *gce = &gl->celldata[px];
  struct grid_extd_entry  *gee;
  u_int      old_offset = gce->offset;
  int      had_extd = (gce->flags & GRID_FLAG_EXTENDED);

  memcpy(gce, &grid_cleared_entry, sizeof *gce);
  if (!moved && had_extd && old_offset < gl->extdsize) {
    gce->flags |= GRID_FLAG_EXTENDED;
    gce->offset = old_offset;
    gee = grid_extended_cell(gl, gce, &grid_cleared_cell);
    if (bg != 8)
      gee->bg = bg;
  } else if (bg != 8) {
    if (bg & (COLOUR_FLAG_RGB|COLOUR_FLAG_THEME)) {
      grid_get_extended_cell(gl, gce, gce->flags);
      gee = grid_extended_cell(gl, gce, &grid_cleared_cell);
      gee->bg = bg;
    } else {
      if (bg & COLOUR_FLAG_256)
        gce->flags |= GRID_FLAG_BG256;
      gce->data.bg = bg;
    }
  }
}

/* Check grid y position. */
static int
grid_check_y(struct grid *gd, const char *from, u_int py)
{
  if (py >= gd->hsize + gd->sy) {
    log_debug("%s: y out of range: %u", from, py);
    return (-1);
  }
  return (0);
}

/* Check if two styles are (visibly) the same. */
int
grid_cells_look_equal(const struct grid_cell *gc1, const struct grid_cell *gc2)
{
  int flags1 = gc1->flags, flags2 = gc2->flags;

  if (gc1->fg != gc2->fg || gc1->bg != gc2->bg)
    return (0);
  if (gc1->attr != gc2->attr)
    return (0);
  if ((flags1 & ~GRID_FLAG_CLEARED) != (flags2 & ~GRID_FLAG_CLEARED))
    return (0);
  if (gc1->link != gc2->link)
    return (0);
  return (1);
}

/* Compare grid cells. Return 1 if equal, 0 if not. */
int
grid_cells_equal(const struct grid_cell *gc1, const struct grid_cell *gc2)
{
  if (!grid_cells_look_equal(gc1, gc2))
    return (0);
  if (gc1->data.width != gc2->data.width)
    return (0);
  if (gc1->data.size != gc2->data.size)
    return (0);
  return (memcmp(gc1->data.data, gc2->data.data, gc1->data.size) == 0);
}

/* Set grid cell to a tab. */
void
grid_set_tab(struct grid_cell *gc, u_int width)
{
  memset(gc->data.data, 0, sizeof gc->data.data);
  gc->flags |= GRID_FLAG_TAB;
  gc->flags &= ~GRID_FLAG_PADDING;
  gc->data.width = gc->data.size = gc->data.have = width;
  memset(gc->data.data, ' ', gc->data.size);
}

/* Free one line. */
static void
grid_free_line(struct grid *gd, u_int py)
{
  struct grid_line  *gl = &gd->linedata[py];

#ifdef __APPLE__
  assert(gl->cellused <= gl->cellsize);
  assert(gl->extdsize == 0 || gl->extddata != NULL);
  assert(gl->cellsize == 0 || gl->celldata != NULL);
#endif

  free(gl->celldata);
  free(gl->extddata);
  memset(gl, 0, sizeof *gl);
}

/* Free several lines. */
void
grid_free_lines(struct grid *gd, u_int py, u_int ny)
{
  u_int yy;

  for (yy = py; yy < py + ny; yy++)
    grid_free_line(gd, yy);
}

/* Create a new grid. */
struct grid *
grid_create(u_int sx, u_int sy, u_int hlimit)
{
  struct grid *gd;

  gd = xcalloc(1, sizeof *gd);
  gd->sx = sx;
  gd->sy = sy;

  if (hlimit != 0)
    gd->flags = GRID_HISTORY;
  gd->hlimit = hlimit;

  if (gd->sy != 0)
    gd->linedata = xcalloc(gd->sy, sizeof *gd->linedata);

#ifdef __APPLE__
  assert(gd->hsize == 0);
#endif
  grid_check_is_clear(gd);
  return (gd);
}

/* Destroy grid. */
void
grid_destroy(struct grid *gd)
{
  grid_free_lines(gd, 0, gd->hsize + gd->sy);
  free(gd->linedata);
  free(gd);
}

/* Compare grids. */
int
grid_compare(struct grid *ga, struct grid *gb)
{
  struct grid_line  *gla, *glb;
  struct grid_cell   gca, gcb;
  u_int      xx, yy;

  if (ga->sx != gb->sx || ga->sy != gb->sy)
    return (1);

  for (yy = 0; yy < ga->sy; yy++) {
    gla = &ga->linedata[yy];
    glb = &gb->linedata[yy];
    if (gla->cellsize != glb->cellsize)
      return (1);
    for (xx = 0; xx < gla->cellsize; xx++) {
      grid_get_cell(ga, xx, yy, &gca);
      grid_get_cell(gb, xx, yy, &gcb);
      if (!grid_cells_equal(&gca, &gcb))
        return (1);
    }
  }

  return (0);
}

/* Trim lines from the history. */
static void
grid_trim_history(struct grid *gd, u_int ny)
{
  u_int remaining;

  grid_free_lines(gd, 0, ny);
  remaining = gd->hsize + gd->sy - ny;
  memmove(&gd->linedata[0], &gd->linedata[ny],
      remaining * (sizeof *gd->linedata));
  memset(&gd->linedata[remaining], 0, ny * (sizeof *gd->linedata));
}

/*
 * Collect lines from the history if at the limit. Free the top (oldest) 10%
 * and shift up.
 */
void
grid_collect_history(struct grid *gd, int all)
{
  u_int ny;

  if (gd->hsize == 0 || gd->hsize < gd->hlimit)
    return;

  if (all)
    ny = gd->hsize - gd->hlimit;
  else
    ny = gd->hlimit / 10;
  if (ny < 1)
    ny = 1;
  if (ny > gd->hsize)
    ny = gd->hsize;

  /*
   * Free the lines from 0 to ny then move the remaining lines over
   * them.
   */
  grid_trim_history(gd, ny);

  gd->hsize -= ny;
  gd->scroll_collected += ny;
  if (gd->hscrolled > gd->hsize)
    gd->hscrolled = gd->hsize;
}

/* Remove lines from the bottom of the history. */
void
grid_remove_history(struct grid *gd, u_int ny)
{
  u_int yy, start;

  if (ny > gd->hsize)
    return;
  start = gd->hsize + gd->sy - ny;
  for (yy = 0; yy < ny; yy++)
    grid_free_line(gd, start + yy);
  memset(&gd->linedata[start], 0, ny * sizeof *gd->linedata);
  gd->hsize -= ny;
}

/*
 * Scroll the entire visible screen, moving one line into the history. Just
 * allocate a new line at the bottom and move the history size indicator.
 */
void
grid_scroll_history(struct grid *gd, u_int bg)
{
  u_int yy;

  yy = gd->hsize + gd->sy;
  gd->linedata = xreallocarray(gd->linedata, yy + 1,
      sizeof *gd->linedata);
  grid_empty_line(gd, yy, bg);

  gd->hscrolled++;
  grid_compact_line(&gd->linedata[gd->hsize]);
  gd->linedata[gd->hsize].time = current_time;
  gd->hsize++;
  gd->scroll_added++;
}

/* Clear the history. */
void
grid_clear_history(struct grid *gd)
{
  grid_trim_history(gd, gd->hsize);

  gd->hscrolled = 0;
  gd->hsize = 0;
  gd->scroll_generation++;

  gd->linedata = xreallocarray(gd->linedata, gd->sy,
      sizeof *gd->linedata);
}

/* Scroll a region up, moving the top line into the history. */
void
grid_scroll_history_region(struct grid *gd, u_int upper, u_int lower, u_int bg)
{
  struct grid_line  *gl_history, *gl_upper;
  u_int      yy;

  /* Create a space for a new line. */
  yy = gd->hsize + gd->sy;
  gd->linedata = xreallocarray(gd->linedata, yy + 1,
      sizeof *gd->linedata);

  /* Move the entire screen down to free a space for this line. */
  gl_history = &gd->linedata[gd->hsize];
  memmove(gl_history + 1, gl_history, gd->sy * sizeof *gl_history);

  /* Adjust the region and find its start and end. */
  upper++;
  gl_upper = &gd->linedata[upper];
  lower++;

  /* Move the line into the history. */
  memcpy(gl_history, gl_upper, sizeof *gl_history);
  gl_history->time = current_time;

  /* Then move the region up and clear the bottom line. */
  memmove(gl_upper, gl_upper + 1, (lower - upper) * sizeof *gl_upper);
  grid_empty_line(gd, lower, bg);

  /* Move the history offset down over the line. */
  gd->hscrolled++;
  gd->hsize++;
  gd->scroll_added++;
}

/* Expand line to fit to cell. */
static void
grid_expand_line(struct grid *gd, u_int py, u_int sx, u_int bg)
{
  struct grid_line  *gl;
  u_int      xx;

  gl = &gd->linedata[py];
  if (sx <= gl->cellsize)
    return;

  if (sx < gd->sx / 4)
    sx = gd->sx / 4;
  else if (sx < gd->sx / 2)
    sx = gd->sx / 2;
  else if (gd->sx > sx)
    sx = gd->sx;

  gl->celldata = xreallocarray(gl->celldata, sx,
      sizeof *gl->celldata);
  if (gl->cellsize < sx) {
    memset(gl->celldata + gl->cellsize, 0,
        (sx - gl->cellsize) * sizeof *gl->celldata);
  }
  for (xx = gl->cellsize; xx < sx; xx++)
    grid_clear_cell(gd, xx, py, bg, 0);
  gl->cellsize = sx;
}

/* Empty a line and set background colour if needed. */
void
grid_empty_line(struct grid *gd, u_int py, u_int bg)
{
  memset(&gd->linedata[py], 0, sizeof gd->linedata[py]);
  if (!COLOUR_DEFAULT(bg))
    grid_expand_line(gd, py, gd->sx, bg);
}

/* Peek at grid line. */
const struct grid_line *
grid_peek_line(struct grid *gd, u_int py)
{
  if (grid_check_y(gd, __func__, py) != 0)
    return (NULL);
  return (&gd->linedata[py]);
}

/* Get cell from line. */
static void
grid_get_cell1(struct grid_line *gl, u_int px, struct grid_cell *gc)
{
  struct grid_cell_entry  *gce = &gl->celldata[px];
  struct grid_extd_entry  *gee;

  if (gce->flags & GRID_FLAG_EXTENDED) {
    if (gce->offset >= gl->extdsize)
      memcpy(gc, &grid_default_cell, sizeof *gc);
    else {
      gee = &gl->extddata[gce->offset];
      gc->flags = gee->flags;
      gc->attr = gee->attr;
      gc->fg = gee->fg;
      gc->bg = gee->bg;
      gc->us = gee->us;
      gc->link = gee->link;

      if (gc->flags & GRID_FLAG_TAB)
        grid_set_tab(gc, gee->data);
      else
        utf8_to_data(gee->data, &gc->data);
    }
    return;
  }

  gc->flags = gce->flags & ~(GRID_FLAG_FG256|GRID_FLAG_BG256);
  gc->attr = gce->data.attr;
  gc->fg = gce->data.fg;
  if (gce->flags & GRID_FLAG_FG256)
    gc->fg |= COLOUR_FLAG_256;
  gc->bg = gce->data.bg;
  if (gce->flags & GRID_FLAG_BG256)
    gc->bg |= COLOUR_FLAG_256;
  gc->us = 8;
  utf8_set(&gc->data, gce->data.data);
  gc->link = 0;
}

/* Get cell for reading. */
void
grid_get_cell(struct grid *gd, u_int px, u_int py, struct grid_cell *gc)
{
  if (grid_check_y(gd, __func__, py) != 0 ||
      px >= gd->linedata[py].cellsize)
    memcpy(gc, &grid_default_cell, sizeof *gc);
  else
    grid_get_cell1(&gd->linedata[py], px, gc);
}

/* Set cell at position. */
void
grid_set_cell(struct grid *gd, u_int px, u_int py, const struct grid_cell *gc)
{
  struct grid_line  *gl;
  struct grid_cell_entry  *gce;

  if (grid_check_y(gd, __func__, py) != 0)
    return;

  grid_expand_line(gd, py, px + 1, 8);

  gl = &gd->linedata[py];
  if (px + 1 > gl->cellused)
    gl->cellused = px + 1;

  gce = &gl->celldata[px];
  if (grid_need_extended_cell(gce, gc))
    grid_extended_cell(gl, gce, gc);
  else
    grid_store_cell(gce, gc, gc->data.data[0]);
}

/* Set padding at position. */
void
grid_set_padding(struct grid *gd, u_int px, u_int py)
{
  grid_set_cell(gd, px, py, &grid_padding_cell);
}

/* Set cells at position. */
void
grid_set_cells(struct grid *gd, u_int px, u_int py, const struct grid_cell *gc,
    const char *s, size_t slen)
{
  struct grid_line  *gl;
  struct grid_cell_entry  *gce;
  struct grid_extd_entry  *gee;
  u_int      i;

  if (grid_check_y(gd, __func__, py) != 0)
    return;

  grid_expand_line(gd, py, px + slen, 8);

  gl = &gd->linedata[py];
  if (px + slen > gl->cellused)
    gl->cellused = px + slen;

  for (i = 0; i < slen; i++) {
    gce = &gl->celldata[px + i];
    if (grid_need_extended_cell(gce, gc)) {
      gee = grid_extended_cell(gl, gce, gc);
      gee->data = utf8_build_one(s[i]);
    } else
      grid_store_cell(gce, gc, s[i]);
  }
}

/* Clear area. */
void
grid_clear(struct grid *gd, u_int px, u_int py, u_int nx, u_int ny, u_int bg)
{
  struct grid_line  *gl;
  u_int      xx, yy, ox, sx;

  if (nx == 0 || ny == 0)
    return;

  if (px == 0 && nx == gd->sx) {
    grid_clear_lines(gd, py, ny, bg);
    return;
  }

  if (grid_check_y(gd, __func__, py) != 0)
    return;
  if (grid_check_y(gd, __func__, py + ny - 1) != 0)
    return;

  for (yy = py; yy < py + ny; yy++) {
    gl = &gd->linedata[yy];

    sx = gd->sx;
    if (sx > gl->cellsize)
      sx = gl->cellsize;
    ox = nx;
    if (COLOUR_DEFAULT(bg)) {
      if (px > sx)
        continue;
      if (px + nx > sx)
        ox = sx - px;
    }

    grid_expand_line(gd, yy, px + ox, 8); /* default bg first */
    for (xx = px; xx < px + ox; xx++)
      grid_clear_cell(gd, xx, yy, bg, 0);
  }
}

/* Clear lines. This just frees and truncates the lines. */
void
grid_clear_lines(struct grid *gd, u_int py, u_int ny, u_int bg)
{
  u_int yy;

  if (ny == 0)
    return;

  if (grid_check_y(gd, __func__, py) != 0)
    return;
  if (grid_check_y(gd, __func__, py + ny - 1) != 0)
    return;

  for (yy = py; yy < py + ny; yy++) {
    grid_free_line(gd, yy);
    grid_empty_line(gd, yy, bg);
  }
  if (py != 0)
    gd->linedata[py - 1].flags &= ~GRID_LINE_WRAPPED;
}

/* Move a group of lines. */
void
grid_move_lines(struct grid *gd, u_int dy, u_int py, u_int ny, u_int bg)
{
  u_int yy;

  if (ny == 0 || py == dy)
    return;

  if (grid_check_y(gd, __func__, py) != 0)
    return;
  if (grid_check_y(gd, __func__, py + ny - 1) != 0)
    return;
  if (grid_check_y(gd, __func__, dy) != 0)
    return;
  if (grid_check_y(gd, __func__, 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_free_line(gd, yy);
  }
  if (dy != 0)
    gd->linedata[dy - 1].flags &= ~GRID_LINE_WRAPPED;

  memmove(&gd->linedata[dy], &gd->linedata[py],
      ny * (sizeof *gd->linedata));

  /*
   * Wipe any lines that have been moved (without freeing them - they are
   * still present).
   */
  for (yy = py; yy < py + ny; yy++) {
    if (yy < dy || yy >= dy + ny)
      grid_empty_line(gd, yy, bg);
  }
  if (py != 0 && (py < dy || py >= dy + ny))
    gd->linedata[py - 1].flags &= ~GRID_LINE_WRAPPED;
}

/* 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 bg)
{
  struct grid_line  *gl;
  u_int      xx;

  if (nx == 0 || px == dx)
    return;

  if (grid_check_y(gd, __func__, py) != 0)
    return;
  gl = &gd->linedata[py];

  grid_expand_line(gd, py, px + nx, 8);
  grid_expand_line(gd, py, dx + nx, 8);
  memmove(&gl->celldata[dx], &gl->celldata[px],
      nx * sizeof *gl->celldata);
  if (dx + nx > gl->cellused)
    gl->cellused = dx + nx;

  /* Wipe any cells that have been moved. */
  for (xx = px; xx < px + nx; xx++) {
    if (xx >= dx && xx < dx + nx)
      continue;
    grid_clear_cell(gd, xx, py, bg, 1);
  }
}

/* Get ANSI foreground sequence. */
static size_t
grid_string_cells_fg(const struct grid_cell *gc, int *values)
{
  size_t  n;
  u_char  r, g, b;
  int c;

  n = 0;
  if (gc->fg & COLOUR_FLAG_THEME) {
    c = colour_theme_terminal_colour(gc->fg & 0xff);
    if (c == 8)
      values[n++] = 39;
    else
      values[n++] = c + 30;
  } else if (gc->fg & COLOUR_FLAG_256) {
    values[n++] = 38;
    values[n++] = 5;
    values[n++] = gc->fg & 0xff;
  } else if (gc->fg & COLOUR_FLAG_RGB) {
    values[n++] = 38;
    values[n++] = 2;
    colour_split_rgb(gc->fg, &r, &g, &b);
    values[n++] = r;
    values[n++] = g;
    values[n++] = b;
  } else {
    switch (gc->fg) {
    case 0:
    case 1:
    case 2:
    case 3:
    case 4:
    case 5:
    case 6:
    case 7:
      values[n++] = gc->fg + 30;
      break;
    case 8:
      values[n++] = 39;
      break;
    case 90:
    case 91:
    case 92:
    case 93:
    case 94:
    case 95:
    case 96:
    case 97:
      values[n++] = gc->fg;
      break;
    }
  }
  return (n);
}

/* Get ANSI background sequence. */
static size_t
grid_string_cells_bg(const struct grid_cell *gc, int *values)
{
  size_t  n;
  u_char  r, g, b;
  int c;

  n = 0;
  if (gc->bg & COLOUR_FLAG_THEME) {
    c = colour_theme_terminal_colour(gc->bg & 0xff);
    if (c == 8)
      values[n++] = 49;
    else
      values[n++] = c + 40;
  } else if (gc->bg & COLOUR_FLAG_256) {
    values[n++] = 48;
    values[n++] = 5;
    values[n++] = gc->bg & 0xff;
  } else if (gc->bg & COLOUR_FLAG_RGB) {
    values[n++] = 48;
    values[n++] = 2;
    colour_split_rgb(gc->bg, &r, &g, &b);
    values[n++] = r;
    values[n++] = g;
    values[n++] = b;
  } else {
    switch (gc->bg) {
    case 0:
    case 1:
    case 2:
    case 3:
    case 4:
    case 5:
    case 6:
    case 7:
      values[n++] = gc->bg + 40;
      break;
    case 8:
      values[n++] = 49;
      break;
    case 90:
    case 91:
    case 92:
    case 93:
    case 94:
    case 95:
    case 96:
    case 97:
      values[n++] = gc->bg + 10;
      break;
    }
  }
  return (n);
}

/* Get underscore colour sequence. */
static size_t
grid_string_cells_us(const struct grid_cell *gc, int *values)
{
  size_t  n;
  u_char  r, g, b;
  int c;

  n = 0;
  if (gc->us & COLOUR_FLAG_THEME) {
    c = colour_theme_terminal_colour(gc->us & 0xff);
    if (c == 8)
      values[n++] = 59;
    else {
      values[n++] = 58;
      values[n++] = 5;
      values[n++] = c;
    }
  } else if (gc->us & COLOUR_FLAG_256) {
    values[n++] = 58;
    values[n++] = 5;
    values[n++] = gc->us & 0xff;
  } else if (gc->us & COLOUR_FLAG_RGB) {
    values[n++] = 58;
    values[n++] = 2;
    colour_split_rgb(gc->us, &r, &g, &b);
    values[n++] = r;
    values[n++] = g;
    values[n++] = b;
  }
  return (n);
}

/* Add on SGR code. */
static void
grid_string_cells_add_code(char *buf, size_t len, u_int n, int *s, int *newc,
    int *oldc, size_t nnewc, size_t noldc, int flags)
{
  u_int i;
  char  tmp[64];
  int reset = (n != 0 && s[0] == 0);

  if (nnewc == 0)
    return; /* no code to add */
  if (!reset &&
      nnewc == noldc &&
      memcmp(newc, oldc, nnewc * sizeof newc[0]) == 0)
    return; /* no reset and colour unchanged */
  if (reset && (newc[0] == 49 || newc[0] == 39))
    return; /* reset and colour default */

  if (flags & GRID_STRING_ESCAPE_SEQUENCES)
    strlcat(buf, "\\033[", len);
  else
    strlcat(buf, "\033[", len);
  for (i = 0; i < nnewc; i++) {
    if (i + 1 < nnewc)
      xsnprintf(tmp, sizeof tmp, "%d;", newc[i]);
    else
      xsnprintf(tmp, sizeof tmp, "%d", newc[i]);
    strlcat(buf, tmp, len);
  }
  strlcat(buf, "m", len);
}

static int
grid_string_cells_add_hyperlink(char *buf, size_t len, const char *id,
    const char *uri, int flags)
{
  char  *tmp;

  if (strlen(uri) + strlen(id) + 17 >= len)
    return (0);

  if (flags & GRID_STRING_ESCAPE_SEQUENCES)
    strlcat(buf, "\\033]8;", len);
  else
    strlcat(buf, "\033]8;", len);
  if (*id != '\0') {
    xasprintf(&tmp, "id=%s;", id);
    strlcat(buf, tmp, len);
    free(tmp);
  } else
    strlcat(buf, ";", len);
  strlcat(buf, uri, len);
  if (flags & GRID_STRING_ESCAPE_SEQUENCES)
    strlcat(buf, "\\033\\\\", len);
  else
    strlcat(buf, "\033\\", len);
  return (1);
}

/*
 * Returns ANSI code to set particular attributes (colour, bold and so on)
 * given a current state.
 */
static void
grid_string_cells_code(const struct grid_cell *lastgc,
    const struct grid_cell *gc, char *buf, size_t len, int flags,
    struct screen *sc, int *has_link)
{
  int      oldc[64], newc[64], s[128];
  size_t       noldc, nnewc, n, i;
  u_int      attr = gc->attr, lastattr = lastgc->attr;
  char       tmp[64];
  const char    *uri, *id;

  static const struct {
    u_int mask;
    u_int code;
  } attrs[] = {
    { GRID_ATTR_BRIGHT, 1 },
    { GRID_ATTR_DIM, 2 },
    { GRID_ATTR_ITALICS, 3 },
    { GRID_ATTR_UNDERSCORE, 4 },
    { GRID_ATTR_BLINK, 5 },
    { GRID_ATTR_REVERSE, 7 },
    { GRID_ATTR_HIDDEN, 8 },
    { GRID_ATTR_STRIKETHROUGH, 9 },
    { GRID_ATTR_UNDERSCORE_2, 42 },
    { GRID_ATTR_UNDERSCORE_3, 43 },
    { GRID_ATTR_UNDERSCORE_4, 44 },
    { GRID_ATTR_UNDERSCORE_5, 45 },
    { GRID_ATTR_OVERLINE, 53 },
  };
  n = 0;

  /* If any attribute is removed, begin with 0. */
  for (i = 0; i < nitems(attrs); i++) {
    if (((~attr & attrs[i].mask) &&
        (lastattr & attrs[i].mask)) ||
        (lastgc->us != 8 && gc->us == 8)) {
      s[n++] = 0;
      lastattr &= GRID_ATTR_CHARSET;
      break;
    }
  }
  /* For each attribute that is newly set, add its code. */
  for (i = 0; i < nitems(attrs); i++) {
    if ((attr & attrs[i].mask) && !(lastattr & attrs[i].mask))
      s[n++] = attrs[i].code;
  }

  /* Write the attributes. */
  *buf = '\0';
  if (n > 0) {
    if (flags & GRID_STRING_ESCAPE_SEQUENCES)
      strlcat(buf, "\\033[", len);
    else
      strlcat(buf, "\033[", len);
    for (i = 0; i < n; i++) {
      if (s[i] < 10)
        xsnprintf(tmp, sizeof tmp, "%d", s[i]);
      else {
        xsnprintf(tmp, sizeof tmp, "%d:%d", s[i] / 10,
            s[i] % 10);
      }
      strlcat(buf, tmp, len);
      if (i + 1 < n)
        strlcat(buf, ";", len);
    }
    strlcat(buf, "m", len);
  }

  /* If the foreground colour changed, write its parameters. */
  nnewc = grid_string_cells_fg(gc, newc);
  noldc = grid_string_cells_fg(lastgc, oldc);
  grid_string_cells_add_code(buf, len, n, s, newc, oldc, nnewc, noldc,
      flags);

  /* If the background colour changed, append its parameters. */
  nnewc = grid_string_cells_bg(gc, newc);
  noldc = grid_string_cells_bg(lastgc, oldc);
  grid_string_cells_add_code(buf, len, n, s, newc, oldc, nnewc, noldc,
      flags);

  /* If the underscore colour changed, append its parameters. */
  nnewc = grid_string_cells_us(gc, newc);
  noldc = grid_string_cells_us(lastgc, oldc);
  grid_string_cells_add_code(buf, len, n, s, newc, oldc, nnewc, noldc,
      flags);

  /* Append shift in/shift out if needed. */
  if ((attr & GRID_ATTR_CHARSET) && !(lastattr & GRID_ATTR_CHARSET)) {
    if (flags & GRID_STRING_ESCAPE_SEQUENCES)
      strlcat(buf, "\\016", len); /* SO */
    else
      strlcat(buf, "\016", len);  /* SO */
  }
  if (!(attr & GRID_ATTR_CHARSET) && (lastattr & GRID_ATTR_CHARSET)) {
    if (flags & GRID_STRING_ESCAPE_SEQUENCES)
      strlcat(buf, "\\017", len); /* SI */
    else
      strlcat(buf, "\017", len);  /* SI */
  }

  /* Add hyperlink if changed. */
  if (sc != NULL && sc->hyperlinks != NULL && lastgc->link != gc->link) {
    if (hyperlinks_get(sc->hyperlinks, gc->link, &uri, &id, NULL)) {
      *has_link = grid_string_cells_add_hyperlink(buf, len,
          id, uri, flags);
    } else if (*has_link) {
      grid_string_cells_add_hyperlink(buf, len, "", "",
          flags);
      *has_link = 0;
    }
  }
}

/* Convert cells into a string. */
char *
grid_string_cells(struct grid *gd, u_int px, u_int py, u_int nx,
    struct grid_cell **lastgc, int flags, struct screen *s)
{
  struct grid_cell   gc;
  static struct grid_cell  lastgc1;
  const char    *data;
  char      *buf, code[8192];
  size_t       len, off, size, codelen;
  u_int      xx, end;
  int      has_link = 0;
  const struct grid_line  *gl;

  if (lastgc != NULL && *lastgc == NULL) {
    memcpy(&lastgc1, &grid_default_cell, sizeof lastgc1);
    *lastgc = &lastgc1;
  }

  len = 128;
  buf = xmalloc(len);
  off = 0;

  gl = grid_peek_line(gd, py);
  if (gl == NULL) {
    buf[0] = '\0';
    return (buf);
  }
  if (flags & GRID_STRING_EMPTY_CELLS)
    end = gl->cellsize;
  else
    end = gl->cellused;
  for (xx = px; xx < px + nx; xx++) {
    if (xx >= end)
      break;
    grid_get_cell(gd, xx, py, &gc);
    if (gc.flags & GRID_FLAG_PADDING)
      continue;

    if (lastgc != NULL && (flags & GRID_STRING_WITH_SEQUENCES)) {
      grid_string_cells_code(*lastgc, &gc, code, sizeof code,
          flags, s, &has_link);
      codelen = strlen(code);
      memcpy(*lastgc, &gc, sizeof **lastgc);
    } else
      codelen = 0;

    if (gc.flags & GRID_FLAG_TAB) {
      data = "\t";
      size = 1;
    } else {
      data = gc.data.data;
      size = gc.data.size;
      if ((flags & GRID_STRING_ESCAPE_SEQUENCES) &&
          size == 1 &&
          *data == '\\') {
        data = "\\\\";
        size = 2;
      }
    }

    while (len < off + size + codelen + 1) {
      buf = xreallocarray(buf, 2, len);
      len *= 2;
    }

    if (codelen != 0) {
      memcpy(buf + off, code, codelen);
      off += codelen;
    }
    memcpy(buf + off, data, size);
    off += size;
  }

  if (has_link) {
    grid_string_cells_add_hyperlink(code, sizeof code, "", "",
        flags);
    codelen = strlen(code);
    while (len < off + size + codelen + 1) {
      buf = xreallocarray(buf, 2, len);
      len *= 2;
    }
    memcpy(buf + off, code, codelen);
    off += codelen;
  }

  if (flags & GRID_STRING_TRIM_SPACES) {
    while (off > 0 && buf[off - 1] == ' ')
      off--;
  }
  buf[off] = '\0';

  return (buf);
}

/*
 * Duplicate a set of lines between two grids. Both source and destination
 * should be big enough.
 */
void
grid_duplicate_lines(struct grid *dst, u_int dy, struct grid *src, u_int sy,
    u_int ny)
{
  struct grid_line  *dstl, *srcl;
  u_int      yy;

  if (dy + ny > dst->hsize + dst->sy)
    ny = dst->hsize + dst->sy - dy;
  if (sy + ny > src->hsize + src->sy)
    ny = src->hsize + src->sy - sy;
  grid_free_lines(dst, dy, ny);

  for (yy = 0; yy < ny; yy++) {
    srcl = &src->linedata[sy];
    dstl = &dst->linedata[dy];

    memcpy(dstl, srcl, sizeof *dstl);
    if (srcl->cellsize != 0) {
      dstl->celldata = xreallocarray(NULL,
          srcl->cellsize, sizeof *dstl->celldata);
      memcpy(dstl->celldata, srcl->celldata,
          srcl->cellsize * sizeof *dstl->celldata);
    } else
      dstl->celldata = NULL;
    if (srcl->extdsize != 0) {
      dstl->extdsize = srcl->extdsize;
      dstl->extddata = xreallocarray(NULL, dstl->extdsize,
          sizeof *dstl->extddata);
      memcpy(dstl->extddata, srcl->extddata, dstl->extdsize *
          sizeof *dstl->extddata);
    } else
      dstl->extddata = NULL;

    sy++;
    dy++;
  }
}

/* Mark line as dead. */
static void
grid_reflow_dead(struct grid_line *gl)
{
  memset(gl, 0, sizeof *gl);
  gl->flags = GRID_LINE_DEAD;
}

/* Add lines, return the first new one. */
static struct grid_line *
grid_reflow_add(struct grid *gd, u_int n)
{
  struct grid_line  *gl;
  u_int      sy = gd->sy + n;

  gd->linedata = xreallocarray(gd->linedata, sy, sizeof *gd->linedata);
  gl = &gd->linedata[gd->sy];
  memset(gl, 0, n * (sizeof *gl));
  gd->sy = sy;
  return (gl);
}

/* Move a line across. */
static struct grid_line *
grid_reflow_move(struct grid *gd, struct grid_line *from)
{
  struct grid_line  *to;

  to = grid_reflow_add(gd, 1);
  memcpy(to, from, sizeof *to);
  grid_reflow_dead(from);
  return (to);
}

/* Join line below onto this one. */
static void
grid_reflow_join(struct grid *target, struct grid *gd, u_int sx, u_int yy,
    u_int width, int already)
{
  struct grid_line  *gl, *from = NULL;
  struct grid_cell   gc;
  u_int      lines, left, i, to, line, want = 0;
  u_int      at;
  int      wrapped = 1;

  /*
   * Add a new target line.
   */
  if (!already) {
    to = target->sy;
    gl = grid_reflow_move(target, &gd->linedata[yy]);
  } else {
    to = target->sy - 1;
    gl = &target->linedata[to];
  }
  at = gl->cellused;

  /*
   * Loop until no more to consume or the target line is full.
   */
  lines = 0;
  for (;;) {
    /*
     * If this is now the last line, there is nothing more to be
     * done.
     */
    if (yy + 1 + lines == gd->hsize + gd->sy)
      break;
    line = yy + 1 + lines;

    /* If the next line is empty, skip it. */
    if (~gd->linedata[line].flags & GRID_LINE_WRAPPED)
      wrapped = 0;
    if (gd->linedata[line].cellused == 0) {
      if (!wrapped)
        break;
      lines++;
      continue;
    }

    /*
     * Is the destination line now full? Copy the first character
     * separately because we need to leave "from" set to the last
     * line if this line is full.
     */
    grid_get_cell1(&gd->linedata[line], 0, &gc);
    if (width + gc.data.width > sx)
      break;
    width += gc.data.width;
    grid_set_cell(target, at, to, &gc);
    at++;

    /* Join as much more as possible onto the current line. */
    from = &gd->linedata[line];
    for (want = 1; want < from->cellused; want++) {
      grid_get_cell1(from, want, &gc);
      if (width + gc.data.width > sx)
        break;
      width += gc.data.width;

      grid_set_cell(target, at, to, &gc);
      at++;
    }
    lines++;

    /*
     * If this line wasn't wrapped or we didn't consume the entire
     * line, don't try to join any further lines.
     */
    if (!wrapped || want != from->cellused || width == sx)
      break;
  }
  if (lines == 0 || from == NULL)
    return;

  /*
   * If we didn't consume the entire final line, then remove what we did
   * consume. If we consumed the entire line and it wasn't wrapped,
   * remove the wrap flag from this line.
   */
  left = from->cellused - want;
  if (left != 0) {
    grid_move_cells(gd, 0, want, yy + lines, left, 8);
    from->cellsize = from->cellused = left;
    lines--;
  } else if (!wrapped)
    gl->flags &= ~GRID_LINE_WRAPPED;

  /* Remove the lines that were completely consumed. */
  for (i = yy + 1; i < yy + 1 + lines; i++) {
    free(gd->linedata[i].celldata);
    free(gd->linedata[i].extddata);
    grid_reflow_dead(&gd->linedata[i]);
  }

  /* Adjust scroll position. */
  if (gd->hscrolled > to + lines)
    gd->hscrolled -= lines;
  else if (gd->hscrolled > to)
    gd->hscrolled = to;
}

/* Split this line into several new ones */
static void
grid_reflow_split(struct grid *target, struct grid *gd, u_int sx, u_int yy,
    u_int at)
{
  struct grid_line  *gl = &gd->linedata[yy], *first;
  struct grid_cell   gc;
  u_int      line, lines, width, i, xx;
  u_int      used = gl->cellused;
  int      flags = gl->flags;

  /* How many lines do we need to insert? We know we need at least two. */
  if (~gl->flags & GRID_LINE_EXTENDED)
    lines = 1 + (gl->cellused - 1) / sx;
  else {
    lines = 2;
    width = 0;
    for (i = at; i < used; i++) {
      grid_get_cell1(gl, i, &gc);
      if (width + gc.data.width > sx) {
        lines++;
        width = 0;
      }
      width += gc.data.width;
    }
  }

  /* Insert new lines. */
  line = target->sy + 1;
  first = grid_reflow_add(target, lines);

  /* Copy sections from the original line. */
  width = 0;
  xx = 0;
  for (i = at; i < used; i++) {
    grid_get_cell1(gl, i, &gc);
    if (width + gc.data.width > sx) {
      target->linedata[line].flags |= GRID_LINE_WRAPPED;

      line++;
      width = 0;
      xx = 0;
    }
    width += gc.data.width;
    grid_set_cell(target, xx, line, &gc);
    xx++;
  }
  if (flags & GRID_LINE_WRAPPED)
    target->linedata[line].flags |= GRID_LINE_WRAPPED;

  /* Move the remainder of the original line. */
  gl->cellsize = gl->cellused = at;
  gl->flags |= GRID_LINE_WRAPPED;
  memcpy(first, gl, sizeof *first);
  grid_reflow_dead(gl);

  /* Adjust the scroll position. */
  if (yy <= gd->hscrolled)
    gd->hscrolled += lines - 1;

  /*
   * If the original line had the wrapped flag and there is still space
   * in the last new line, try to join with the next lines.
   */
  if (width < sx && (flags & GRID_LINE_WRAPPED))
    grid_reflow_join(target, gd, sx, yy, width, 1);
}

/* Reflow lines on grid to new width. */
void
grid_reflow(struct grid *gd, u_int sx)
{
  struct grid   *target;
  struct grid_line  *gl;
  struct grid_cell   gc;
  u_int      yy, width, i, at;

  /*
   * Create a destination grid. This is just used as a container for the
   * line data and may not be fully valid.
   */
  target = grid_create(gd->sx, 0, 0);

  /*
   * Loop over each source line.
   */
  for (yy = 0; yy < gd->hsize + gd->sy; yy++) {
    gl = &gd->linedata[yy];
    if (gl->flags & GRID_LINE_DEAD)
      continue;

    /*
     * Work out the width of this line. at is the point at which
     * the available width is hit, and width is the full line
     * width.
     */
    at = width = 0;
    if (~gl->flags & GRID_LINE_EXTENDED) {
      width = gl->cellused;
      if (width > sx)
        at = sx;
      else
        at = width;
    } else {
      for (i = 0; i < gl->cellused; i++) {
        grid_get_cell1(gl, i, &gc);
        if (at == 0 && width + gc.data.width > sx)
          at = i;
        width += gc.data.width;
      }
    }

    /*
     * If the line is exactly right, just move it across
     * unchanged.
     */
    if (width == sx) {
      grid_reflow_move(target, gl);
      continue;
    }

    /*
     * If the line is too big, it needs to be split, whether or not
     * it was previously wrapped.
     */
    if (width > sx) {
      grid_reflow_split(target, gd, sx, yy, at);
      continue;
    }

    /*
     * If the line was previously wrapped, join as much as possible
     * of the next line.
     */
    if (gl->flags & GRID_LINE_WRAPPED)
      grid_reflow_join(target, gd, sx, yy, width, 0);
    else
      grid_reflow_move(target, gl);
  }

  /*
   * Replace the old grid with the new.
   */
  if (target->sy < gd->sy)
    grid_reflow_add(target, gd->sy - target->sy);
  gd->hsize = target->sy - gd->sy;
  if (gd->hscrolled > gd->hsize)
    gd->hscrolled = gd->hsize;
  free(gd->linedata);
  gd->linedata = target->linedata;
  free(target);
  gd->scroll_generation++;
}

/* Convert to position based on wrapped lines. */
void
grid_wrap_position(struct grid *gd, u_int px, u_int py, u_int *wx, u_int *wy)
{
  u_int ax = 0, ay = 0, yy;

  for (yy = 0; yy < py; yy++) {
    if (gd->linedata[yy].flags & GRID_LINE_WRAPPED)
      ax += gd->linedata[yy].cellused;
    else {
      ax = 0;
      ay++;
    }
  }
  if (px >= gd->linedata[yy].cellused)
    ax = UINT_MAX;
  else
    ax += px;
  *wx = ax;
  *wy = ay;
}

/* Convert position based on wrapped lines back. */
void
grid_unwrap_position(struct grid *gd, u_int *px, u_int *py, u_int wx, u_int wy)
{
  u_int yy, ay = 0;

  for (yy = 0; yy < gd->hsize + gd->sy - 1; yy++) {
    if (ay == wy)
      break;
    if (~gd->linedata[yy].flags & GRID_LINE_WRAPPED)
      ay++;
  }

  /*
   * yy is now 0 on the unwrapped line which contains wx. Walk forwards
   * until we find the end or the line now containing wx.
   */
  if (wx == UINT_MAX) {
    while (gd->linedata[yy].flags & GRID_LINE_WRAPPED)
      yy++;
    wx = gd->linedata[yy].cellused;
  } else {
    while (gd->linedata[yy].flags & GRID_LINE_WRAPPED) {
      if (wx < gd->linedata[yy].cellused)
        break;
      wx -= gd->linedata[yy].cellused;
      yy++;
    }
  }
  *px = wx;
  *py = yy;
}

/* Get length of line. */
u_int
grid_line_length(struct grid *gd, u_int py)
{
  struct grid_cell  gc;
  u_int     px;

  px = grid_get_line(gd, py)->cellsize;
  if (px > gd->sx)
    px = gd->sx;
  while (px > 0) {
    grid_get_cell(gd, px - 1, py, &gc);
    if ((gc.flags & GRID_FLAG_PADDING) ||
        gc.data.size != 1 ||
        *gc.data.data != ' ')
      break;
    px--;
  }
  return (px);
}

/* Check if character is in set. */
int
grid_in_set(struct grid *gd, u_int px, u_int py, const char *set)
{
  struct grid_cell  gc, tmp_gc;
  u_int     pxx;

  grid_get_cell(gd, px, py, &gc);
  if (strchr(set, '\t')) {
    if (gc.flags & GRID_FLAG_PADDING) {
      pxx = px;
      do
        grid_get_cell(gd, --pxx, py, &tmp_gc);
      while (pxx > 0 && tmp_gc.flags & GRID_FLAG_PADDING);
      if (tmp_gc.flags & GRID_FLAG_TAB)
        return (tmp_gc.data.width - (px - pxx));
    } else if (gc.flags & GRID_FLAG_TAB)
      return (gc.data.width);
  }
  if (gc.flags & GRID_FLAG_PADDING)
    return (0);
  return (utf8_cstrhas(set, &gc.data));
}

/* Line flags to string. */
const char *
grid_line_flags_string(int flags)
{
  static char s[128];

  *s = '\0';
  if (flags & GRID_LINE_WRAPPED)
    strlcat(s, "WRAPPED,", sizeof s);
  if (flags & GRID_LINE_EXTENDED)
    strlcat(s, "EXTENDED,", sizeof s);
  if (flags & GRID_LINE_DEAD)
    strlcat(s, "DEAD,", sizeof s);
  if (flags & GRID_LINE_START_PROMPT)
    strlcat(s, "START_PROMPT,", sizeof s);
  if (flags & GRID_LINE_START_OUTPUT)
    strlcat(s, "START_OUTPUT,", sizeof s);
  if (flags & GRID_LINE_HYPERLINK)
    strlcat(s, "HYPERLINK,", sizeof s);
  if (*s == '\0')
    return ("NONE");
  s[strlen(s) - 1] = '\0';
  return (s);
}

/* Cell flags to string. */
const char *
grid_cell_flags_string(int flags)
{
  static char s[128];

  *s = '\0';
  if (flags & GRID_FLAG_FG256)
    strlcat(s, "FG256,", sizeof s);
  if (flags & GRID_FLAG_BG256)
    strlcat(s, "BG256,", sizeof s);
  if (flags & GRID_FLAG_PADDING)
    strlcat(s, "PADDING,", sizeof s);
  if (flags & GRID_FLAG_EXTENDED)
    strlcat(s, "EXTENDED,", sizeof s);
  if (flags & GRID_FLAG_SELECTED)
    strlcat(s, "SELECTED,", sizeof s);
  if (flags & GRID_FLAG_CLEARED)
    strlcat(s, "CLEARED,", sizeof s);
  if (flags & GRID_FLAG_TAB)
    strlcat(s, "TAB,", sizeof s);
  if (flags & GRID_FLAG_NOPALETTE)
    strlcat(s, "NOPALETTE,", sizeof s);
  if (*s == '\0')
    return ("NONE");
  s[strlen(s) - 1] = '\0';
  return (s);
}

/* Cell attributes to string. */
const char *
grid_cell_attr_string(int attr)
{
  static char s[256];

  *s = '\0';
  if (attr & GRID_ATTR_CHARSET)
    strlcat(s, "CHARSET,", sizeof s);
  if (attr & GRID_ATTR_BRIGHT)
    strlcat(s, "BRIGHT,", sizeof s);
  if (attr & GRID_ATTR_DIM)
    strlcat(s, "DIM,", sizeof s);
  if (attr & GRID_ATTR_UNDERSCORE)
    strlcat(s, "UNDERSCORE,", sizeof s);
  if (attr & GRID_ATTR_BLINK)
    strlcat(s, "BLINK,", sizeof s);
  if (attr & GRID_ATTR_REVERSE)
    strlcat(s, "REVERSE,", sizeof s);
  if (attr & GRID_ATTR_HIDDEN)
    strlcat(s, "HIDDEN,", sizeof s);
  if (attr & GRID_ATTR_ITALICS)
    strlcat(s, "ITALICS,", sizeof s);
  if (attr & GRID_ATTR_STRIKETHROUGH)
    strlcat(s, "STRIKETHROUGH,", sizeof s);
  if (attr & GRID_ATTR_UNDERSCORE_2)
    strlcat(s, "UNDERSCORE_2,", sizeof s);
  if (attr & GRID_ATTR_UNDERSCORE_3)
    strlcat(s, "UNDERSCORE_3,", sizeof s);
  if (attr & GRID_ATTR_UNDERSCORE_4)
    strlcat(s, "UNDERSCORE_4,", sizeof s);
  if (attr & GRID_ATTR_UNDERSCORE_5)
    strlcat(s, "UNDERSCORE_5,", sizeof s);
  if (attr & GRID_ATTR_OVERLINE)
    strlcat(s, "OVERLINE,", sizeof s);
  if (*s == '\0')
    return ("NONE");
  s[strlen(s) - 1] = '\0';
  return (s);
}

Coverage Report

Created: 2026-07-16 06:53