Function _readBitmapset

src/backend/nodes/readfuncs.c:224–260

* _readBitmapset */

 * _readBitmapset
 */
static Bitmapset *
_readBitmapset(void)
{
	Bitmapset  *result = NULL;

	READ_TEMP_LOCALS();

	token = pg_strtok(&length);
	if (token == NULL)
		elog(ERROR, "incomplete Bitmapset structure");
	if (length != 1 || token[0] != '(')
		elog(ERROR, "unrecognized token: \"%.*s\"", length, token);

	token = pg_strtok(&length);
	if (token == NULL)
		elog(ERROR, "incomplete Bitmapset structure");
	if (length != 1 || token[0] != 'b')
		elog(ERROR, "unrecognized token: \"%.*s\"", length, token);

	for (;;)
	{
		int			val;
		char	   *endptr;

		token = pg_strtok(&length);
		if (token == NULL)
			elog(ERROR, "unterminated Bitmapset structure");
		if (length == 1 && token[0] == ')')
			break;
		val = (int) strtol(token, &endptr, 10);
		if (endptr != token + length)
			elog(ERROR, "unrecognized integer: \"%.*s\"", length, token);
		result = bms_add_member(result, val);
	}

	return result;
}

/*
 * for use by extensions which define extensible nodes