Fix crash when parsing a PCB file with an invalid net code.

pcbnew/class_board_connected_item.cpp

@@ -48,7 +48,7 @@ BOARD_CONNECTED_ITEM::BOARD_CONNECTED_ITEM( const BOARD_CONNECTED_ITEM& aItem )
 }
 
 
-void BOARD_CONNECTED_ITEM::SetNetCode( int aNetCode )
+bool BOARD_CONNECTED_ITEM::SetNetCode( int aNetCode, bool aNoAssert )
 {
     // if aNetCode < 0 ( typically NETINFO_LIST::FORCE_ORPHANED )
     // or no parent board,
@@ -61,7 +61,9 @@ void BOARD_CONNECTED_ITEM::SetNetCode( int aNetCode )
     else
         m_netinfo = &NETINFO_LIST::ORPHANED;
 
-    assert( m_netinfo );
+    if( !aNoAssert )
+        assert( m_netinfo );
+    return m_netinfo;
 }
 
 

pcbnew/class_board_connected_item.h

@@ -104,9 +104,11 @@ public:
      * Function SetNetCode
      * sets net using a net code.
      * @param aNetCode is a net code for the new net. It has to exist in NETINFO_LIST held by BOARD.
+     * @param aNoAssert if true, do not assert that the net exists.
      * Otherwise, item is assigned to the unconnected net.
+     * @return true on success, false if the net did not exist
      */
-    void SetNetCode( int aNetCode );
+    bool SetNetCode( int aNetCode, bool aNoAssert=false );
 
     /**
      * Function GetSubNet

pcbnew/pcb_parser.cpp

@@ -2408,7 +2408,11 @@ TRACK* PCB_PARSER::parseTRACK() throw( IO_ERROR, PARSE_ERROR )
             break;
 
         case T_net:
-            track->SetNetCode( getNetCode( parseInt( "net number" ) ) );
+            if( ! track->SetNetCode( getNetCode( parseInt( "net number" ) ), /* aNoAssert */ true ) )
+                THROW_IO_ERROR(
+                    wxString::Format( _( "invalid net ID in\nfile: <%s>\nline: %d\noffset: %d" ),
+                                      GetChars( CurSource() ), CurLineNumber(), CurOffset() )
+                    );
             break;
 
         case T_tstamp: