fix index out of bounds error when reading gems

docs/changelog.txt

@@ -42,6 +42,8 @@ changelog.txt uses a syntax similar to RST, with a few special sequences:
 - `blueprint`: interpret saplings, shrubs, and twigs as floors instead of walls
 - `combine`: fix error processing stockpiles with boundaries that extend outside of the map
 - `prospector`: display both "raw" Z levels and "cooked" elevations
+- `stockpiles`: fix crash when importing settings for gems from other worlds
+- `stockpiles`: allow numbers in saved stockpile filenames
 
 ## Misc Improvements
 - `buildingplan`: items in the item selection dialog should now use the same item quality symbols as the base game

plugins/lua/stockpiles.lua

@@ -62,7 +62,7 @@ local function assert_safe_name(name)
     if not name or #name == 0 then
         qerror('name missing or empty')
     end
-    if name:find('[^%a._]') then
+    if name:find('[^%w._]') then
         qerror('name can only contain numbers, letters, periods, and underscores')
     end
 end

plugins/stockpiles/StockpileSerializer.cpp

@@ -1871,15 +1871,19 @@ void StockpileSerializer::read_gems(DeserializeMode mode, const vector<string>&
                 return;
             } else {
                 MaterialInfo mi;
-                for (size_t i = 0; i < builtin_size; ++i) {
+                for (int i = 0; i < (int)builtin_size; ++i) {
+                    if (i < bgems.rough_other_mats_size()) {
                         string id = bgems.rough_other_mats(i);
                         if (mi.find(id) && mi.isValid() && size_t(mi.type) < builtin_size)
                             set_filter_elem("other/rough", filters, val, id, mi.type, pgems.rough_other_mats.at(mi.type));
-                    id = bgems.cut_other_mats(i);
+                    }
+                    if (i < bgems.cut_other_mats_size()) {
+                        string id = bgems.cut_other_mats(i);
                         if (mi.find(id) && mi.isValid() && size_t(mi.type) < builtin_size)
                             set_filter_elem("other/cut", filters, val, id, mi.type, pgems.cut_other_mats.at(mi.type));
                     }
                 }
+            }
         });
 }