environment variable names should be configurable

luaconf.h

@@ -1,5 +1,5 @@
 /*
-** $Id: luaconf.h,v 1.80 2006/01/27 13:54:39 roberto Exp roberto $
+** $Id: luaconf.h,v 1.81 2006/02/10 17:44:06 roberto Exp roberto $
 ** Configuration file for Lua
 ** See Copyright Notice in lua.h
 */
@@ -59,6 +59,18 @@
 #endif
 
 
+/*
+@@ LUA_PATH and LUA_CPATH are the names of the environment variables that
+@* Lua check to set its paths.
+@@ LUA_INIT is the name of the environment variable that Lua
+@* checks for initialization code.
+** CHANGE them if you want different names.
+*/
+#define LUA_PATH        "LUA_PATH"
+#define LUA_CPATH       "LUA_CPATH"
+#define LUA_INIT	"LUA_INIT"
+
+
 /*
 @@ LUA_PATH_DEFAULT is the default path that Lua uses to look for
 @* Lua libraries.
@@ -543,11 +555,25 @@
 /* On a Pentium, resort to a trick */
 #if defined(LUA_NUMBER_DOUBLE) && !defined(LUA_ANSI) && !defined(__SSE2__) && \
     (defined(__i386) || defined (_M_IX86) || defined(__i386__))
+
+/* On a Microsoft compiler, use assembler */
+#if defined(_MSC_VER)
+
+#define lua_number2int(i,d)   __asm fld d   __asm fistp i
+#define lua_number2integer(i,n)		lua_number2int(i, n)
+
+/* the next trick should work on any Pentium, but sometimes clashes
+   with a DirectX idiosyncrasy */
+#else
+
 union luai_Cast { double l_d; long l_l; };
 #define lua_number2int(i,d) \
   { volatile union luai_Cast u; u.l_d = (d) + 6755399441055744.0; (i) = u.l_l; }
 #define lua_number2integer(i,n)		lua_number2int(i, n)
 
+#endif
+
+
 /* this option always works, but may be slow */
 #else
 #define lua_number2int(i,d)	((i)=(int)(d))