From 69ed4d5884d3308f56ebbde8b43cd70ecf5c235a Mon Sep 17 00:00:00 2001
From: Felipe Zimmerle <felipe@zimmerle.org>
Date: Mon, 8 Jun 2020 13:01:45 -0300
Subject: [PATCH] Makes Lua::run const

---
 src/engine/lua.cc |  8 +++++---
 src/engine/lua.h  | 10 +++++++++-
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/src/engine/lua.cc b/src/engine/lua.cc
index b58b28a2..86da6fd1 100644
--- a/src/engine/lua.cc
+++ b/src/engine/lua.cc
@@ -121,7 +121,7 @@ const char *Lua::blob_reader(lua_State *L, void *ud, size_t *size) {
 #endif
 
 
-int Lua::run(Transaction *t, const std::string &str) {
+int Lua::run(Transaction *t, const std::string &str) const {
 #ifdef WITH_LUA
     std::string luaRet;
     const char *a = NULL;
@@ -138,10 +138,12 @@ int Lua::run(Transaction *t, const std::string &str) {
     luaL_setfuncs(L, mscLuaLib, 0);
     lua_setglobal(L, "m");
 
+    LuaScriptBlob blob(m_blob);
+
 #ifdef WITH_LUA_5_1
-    int rc = lua_load(L, Lua::blob_reader, &m_blob, m_scriptName.c_str());
+    int rc = lua_load(L, Lua::blob_reader, &blob, m_scriptName.c_str());
 #else
-    int rc = lua_load(L, Lua::blob_reader, &m_blob, m_scriptName.c_str(),
+    int rc = lua_load(L, Lua::blob_reader, &blob, m_scriptName.c_str(),
         NULL);
 #endif
     if (rc != LUA_OK) {
diff --git a/src/engine/lua.h b/src/engine/lua.h
index 02882e84..ebc51c11 100644
--- a/src/engine/lua.h
+++ b/src/engine/lua.h
@@ -43,6 +43,14 @@ class LuaScriptBlob {
         }
     }
 
+    LuaScriptBlob(const LuaScriptBlob &other) :
+        m_data(NULL),
+        m_len(other.m_len) {
+            m_data = (unsigned char *)std::malloc(m_len);
+            // FIXME: m_data NULL?
+            std::memcpy(m_data, other.m_data, m_len);
+        }
+
 
     void write(const void *data, size_t len) {
         unsigned char *d = (unsigned char *)realloc((unsigned char *)m_data, len + m_len);
@@ -68,7 +76,7 @@ class Lua {
     Lua() { }
 
     bool load(const std::string &script, std::string *err);
-    int run(Transaction *t, const std::string &str="");
+    int run(Transaction *t, const std::string &str="") const;
     static bool isCompatible(const std::string &script, Lua *l, std::string *error);
 
 #ifdef WITH_LUA