Change: Use SlErrorCorrupt() on pool index error when loading a saveg…

…ame, instead of terminating. (OpenTTD#7219)

src/core/pool_func.hpp

@@ -152,18 +152,20 @@ DEFINE_POOL_METHOD(void *)::GetNew(size_t size)
  * @param size size of item
  * @param index index of item
  * @return pointer to allocated item
- * @note usererror() on failure! (index out of range or already used)
+ * @note SlErrorCorruptFmt() on failure! (index out of range or already used)
  */
 DEFINE_POOL_METHOD(void *)::GetNew(size_t size, size_t index)
 {
+	extern void NORETURN SlErrorCorruptFmt(const char *format, ...);
+
 	if (index >= Tmax_size) {
-		usererror("failed loading savegame: %s index " PRINTF_SIZE " out of range (" PRINTF_SIZE ")", this->name, index, Tmax_size);
+		SlErrorCorruptFmt("%s index " PRINTF_SIZE " out of range (" PRINTF_SIZE ")", this->name, index, Tmax_size);
 	}
 
 	if (index >= this->size) this->ResizeFor(index);
 
 	if (this->data[index] != NULL) {
-		usererror("failed loading savegame: %s index " PRINTF_SIZE " already in use", this->name, index);
+		SlErrorCorruptFmt("%s index " PRINTF_SIZE " already in use", this->name, index);
 	}
 
 	return this->AllocateItem(size, index);

src/saveload/saveload.cpp

@@ -350,6 +350,25 @@ void NORETURN SlErrorCorrupt(const char *msg)
 	SlError(STR_GAME_SAVELOAD_ERROR_BROKEN_SAVEGAME, msg);
 }
 
+/**
+ * Issue an SlErrorCorrupt with a format string.
+ * @param format format string
+ * @param ... arguments to format string
+ * @note This function does never return as it throws an exception to
+ *       break out of all the saveload code.
+ */
+void NORETURN SlErrorCorruptFmt(const char *format, ...)
+{
+	va_list ap;
+	char msg[256];
+
+	va_start(ap, format);
+	vseprintf(msg, lastof(msg), format, ap);
+	va_end(ap);
+
+	SlErrorCorrupt(msg);
+}
+
 
 typedef void (*AsyncSaveFinishProc)();                ///< Callback for when the savegame loading is finished.
 static AsyncSaveFinishProc _async_save_finish = NULL; ///< Callback to call when the savegame loading is finished.

src/saveload/saveload.h

@@ -836,6 +836,7 @@ void SlObject(void *object, const SaveLoad *sld);
 bool SlObjectMember(void *object, const SaveLoad *sld);
 void NORETURN SlError(StringID string, const char *extra_msg = NULL);
 void NORETURN SlErrorCorrupt(const char *msg);
+void NORETURN SlErrorCorruptFmt(const char *format, ...);
 
 bool SaveloadCrashWithMissingNewGRFs();