Function plpgsql_location_to_lineno

src/pl/plpgsql/src/pl_scanner.c:540–561

* Given a location (a byte offset in the function source text), * return a line number. * * We expect that this is typically called for a sequence of increasing * location values, so optimize accordingly by tracking the endpoints * of the "current" line. */

 * of the "current" line.
 */
int
plpgsql_location_to_lineno(int location)
{
	const char *loc;

	if (location < 0 || scanorig == NULL)
		return 0;				/* garbage in, garbage out */
	loc = scanorig + location;

	/* be correct, but not fast, if input location goes backwards */
	if (loc < cur_line_start)
		location_lineno_init();

	while (cur_line_end != NULL && loc > cur_line_end)
	{
		cur_line_start = cur_line_end + 1;
		cur_line_num++;
		cur_line_end = strchr(cur_line_start, '\n');
	}

	return cur_line_num;
}

/* initialize or reset the state for plpgsql_location_to_lineno */
static void