This code fixes the crash Freeciv has generating maps less than 18
units (360 miles?) high.

Note that the practical lower limit seems to be a 12x12 map.  FreeCiv does
really weird things with smaller maps.

Also note that the client is really buggy with narrow maps; the client
assumes that a given element is only seen once on the screen.

- Sam

--- freeciv-1.14.0/server/mapgen.c.orig	Sun Mar 23 02:45:43 2003
+++ freeciv-1.14.0/server/mapgen.c	Sun Mar 23 03:05:44 2003
@@ -261,13 +261,23 @@
   while (i > 0 && j < 500) {
     j++;
 
-    y=myrand(map.ysize*10/180)+map.ysize*110/180;
+    if(map.ysize >= 18) {
+        y=myrand(map.ysize*10/180)+map.ysize*110/180;
+        }
+    else {
+        y = map.ysize*110/180;
+	}
     x=myrand(map.xsize);
     if (map_get_terrain(x, y)==T_GRASSLAND) {
       make_desert(x,y, hmap(x, y), 50);
       i--;
     }
-    y=myrand(map.ysize*10/180)+map.ysize*60/180;
+    if(map.ysize >= 18) {
+        y=myrand(map.ysize*10/180)+map.ysize*60/180;
+        }
+    else {
+        y = map.ysize*60/180;
+	}
     x=myrand(map.xsize);
     if (map_get_terrain(x, y)==T_GRASSLAND) {
       make_desert(x,y, hmap(x, y), 50);