+
+ void **cc = &table->cc[x1 + y1 * table_nc (table)];
+ unsigned short *ct = &table->ct[x1 + y1 * table_nc (table)];
+ const int ofs = table_nc (table) - (x2 - x1);
+ for (int y = y1; y < y2; y++)
+ {
+ for (int x = x1; x < x2; x++)
+ {
+ *cc++ = cell;
+ *ct++ = opt | TAB_JOIN;
+ }
+
+ cc += ofs;
+ ct += ofs;
+ }
+
+ return cell;
+}
+
+/* Joins cells (X1,X2)-(Y1,Y2) inclusive in TABLE, and sets them with
+ options OPT to have text value TEXT. */
+void
+table_joint_text (struct table *table, int x1, int y1, int x2, int y2,
+ unsigned opt, const char *text)
+{
+ char *s = pool_strdup (table->container, text);
+ if (x1 == x2 && y1 == y2)
+ do_table_text (table, x1, y1, opt, s);
+ else
+ add_joined_cell (table, x1, y1, x2, y2, opt)->text = s;
+}
+
+static struct table_cell *
+get_joined_cell (struct table *table, int x, int y)
+{
+ int index = x + y * table_nc (table);
+ unsigned short opt = table->ct[index];
+ struct table_cell *cell;
+
+ if (opt & TAB_JOIN)
+ cell = table->cc[index];
+ else
+ {
+ char *text = table->cc[index];
+
+ cell = add_joined_cell (table, x, y, x, y, table->ct[index]);
+ cell->text = text ? text : pool_strdup (table->container, "");
+ }
+ return cell;
+}
+
+/* Sets the subscripts for column X, row Y in TABLE. */
+void
+table_add_subscripts (struct table *table, int x, int y,
+ char **subscripts, size_t n_subscripts)
+{
+ struct table_cell *cell = get_joined_cell (table, x, y);
+
+ cell->n_subscripts = n_subscripts;
+ cell->subscripts = pool_nalloc (table->container, n_subscripts,
+ sizeof *cell->subscripts);
+ for (size_t i = 0; i < n_subscripts; i++)
+ cell->subscripts[i] = pool_strdup (table->container, subscripts[i]);
+}
+
+/* Sets the superscript for column X, row Y in TABLE. */
+void
+table_add_superscript (struct table *table, int x, int y,
+ const char *superscript)
+{
+ get_joined_cell (table, x, y)->superscript
+ = pool_strdup (table->container, superscript);
+}
+
+/* Create a footnote in TABLE with MARKER (e.g. "a") as its marker and CONTENT
+ as its content. The footnote will be styled as STYLE, which is mandatory.
+ IDX must uniquely identify the footnote within TABLE.
+
+ Returns the new footnote. The return value is the only way to get to the
+ footnote later, so it is important for the caller to remember it. */
+struct footnote *
+table_create_footnote (struct table *table, size_t idx, const char *content,
+ const char *marker, struct area_style *style)
+{
+ assert (style);
+
+ struct footnote *f = pool_alloc (table->container, sizeof *f);
+ f->idx = idx;
+ f->content = pool_strdup (table->container, content);
+ f->marker = pool_strdup (table->container, marker);
+ f->style = style;
+ return f;
+}
+
+/* Attaches a reference to footnote F to the cell at column X, row Y in
+ TABLE. */
+void
+table_add_footnote (struct table *table, int x, int y,
+ const struct footnote *f)
+{
+ assert (f->style);
+
+ struct table_cell *cell = get_joined_cell (table, x, y);
+
+ cell->footnotes = pool_realloc (
+ table->container, cell->footnotes,
+ (cell->n_footnotes + 1) * sizeof *cell->footnotes);
+
+ cell->footnotes[cell->n_footnotes++] = f;
+}
+
+/* Overrides the style for column X, row Y in TABLE with STYLE.
+ Does not make a copy of STYLE, so it should either be allocated from
+ TABLE->container or have a lifetime that will outlive TABLE. */
+void
+table_add_style (struct table *table, int x, int y,
+ const struct area_style *style)
+{
+ get_joined_cell (table, x, y)->style = style;
+}
+
+/* Returns true if column C, row R has no contents, otherwise false. */
+bool
+table_cell_is_empty (const struct table *table, int c, int r)
+{
+ return table->cc[c + r * table_nc (table)] == NULL;
+}