Fixed: Attempt to use memory zone before it was initialized

ddstring_t will now automatically switch to using standard
memory allocation if the memory zone is not available.

doomsday/engine/portable/include/dd_zone.h

@@ -38,7 +38,16 @@
 #define PU_REFRESHTRANS     13
 #define PU_REFRESHRAW       17
 
-int             Z_Init(void);
+/**
+ * Determines if the memory zone is available for allocations.
+ */
+boolean Z_IsInited(void);
+
+/**
+ * Initialize the memory zone.
+ */
+int Z_Init(void);
+
 void            Z_Shutdown(void);
 void            Z_EnableFastMalloc(boolean isEnabled);
 //void            Z_PrintStatus(void);

doomsday/engine/portable/src/dd_zone.c

@@ -190,9 +190,11 @@ memvolume_t *Z_Create(size_t volumeSize)
     return vol;
 }
 
-/**
- * Initialize the memory zone.
- */
+boolean Z_IsInited(void)
+{
+    return zoneMutex != 0;
+}
+
 int Z_Init(void)
 {
     zoneMutex = Sys_CreateMutex("ZONE_MUTEX");

doomsday/engine/portable/src/m_string.c

@@ -106,6 +106,14 @@ void Str_Init(ddstring_t *str)
         Con_Error("Attempted String::Init with invalid reference (this==0).");
         return; // Unreachable.
     }
+
+    if(!Z_IsInited())
+    {
+        // The memory zone is not available at the moment.
+        Str_InitStd(str);
+        return;
+    }
+
     memset(str, 0, sizeof(*str));
 
     // Init the memory management.