From 8a11b6b31d253b3d54daa8afadf92b4073c5f127 Mon Sep 17 00:00:00 2001
From: jacksonmj <mj-pt@jacksonmj.co.uk>
Date: Fri, 20 Jan 2012 06:32:28 +0800
Subject: [PATCH] Check coordinates of signs before using them to read pmap or
 pressure

---
 src/graphics.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/graphics.c b/src/graphics.c
index aa72139b7..c460725ab 100644
--- a/src/graphics.c
+++ b/src/graphics.c
@@ -3056,15 +3056,18 @@ void render_signs(pixel *vid_buf)
 			//Displaying special information
 			if (strcmp(signs[i].text, "{p}")==0)
 			{
-				sprintf(buff, "Pressure: %3.2f", pv[signs[i].y/CELL][signs[i].x/CELL]);  //...pressure
+				float pressure = 0.0f;
+				if (signs[i].x>=0 && signs[i].x<XRES && signs[i].y>=0 && signs[i].y<YRES)
+					pressure = pv[signs[i].y/CELL][signs[i].x/CELL];
+				sprintf(buff, "Pressure: %3.2f", pressure);  //...pressure
 				drawtext(vid_buf, x+3, y+3, buff, 255, 255, 255, 255);
 			}
 			if (strcmp(signs[i].text, "{t}")==0)
 			{
-				if (pmap[signs[i].y][signs[i].x])
-					sprintf(buff, "Temp: %4.2f", parts[pmap[signs[i].y][signs[i].x]>>8].temp-273.15);  //...tempirature
+				if (signs[i].x>=0 && signs[i].x<XRES && signs[i].y>=0 && signs[i].y<YRES && pmap[signs[i].y][signs[i].x])
+					sprintf(buff, "Temp: %4.2f", parts[pmap[signs[i].y][signs[i].x]>>8].temp-273.15);  //...temperature
 				else
-					sprintf(buff, "Temp: 0.00");  //...tempirature
+					sprintf(buff, "Temp: 0.00");  //...temperature
 				drawtext(vid_buf, x+3, y+3, buff, 255, 255, 255, 255);
 			}