Function IsPagerNeeded

src/fe_utils/print.c:3281–3311

* IsPagerNeeded * * Setup pager if required */

 * Setup pager if required
 */
static void
IsPagerNeeded(const printTableContent *cont, int extra_lines, bool expanded,
			  FILE **fout, bool *is_pager)
{
	if (*fout == stdout)
	{
		int			lines;

		if (expanded)
			lines = (cont->ncolumns + 1) * cont->nrows;
		else
			lines = cont->nrows + 1;

		if (!cont->opt->tuples_only)
		{
			printTableFooter *f;

			/*
			 * FIXME -- this is slightly bogus: it counts the number of
			 * footers, not the number of lines in them.
			 */
			for (f = cont->footers; f; f = f->next)
				lines++;
		}

		*fout = PageOutput(lines + extra_lines, cont->opt);
		*is_pager = (*fout != stdout);
	}
	else
		*is_pager = false;
}

/*
 * Use this to print any table in the supported formats.