vendor: 引入 Lua 5.0.3 官方源码 (lua_5.0 分支)

桥接层适配尚未完成。Lua 5.0 与 5.1+ 差异显著:
- 无 linit.c/loslib.c(luaopen_os 混于 liolib.c)
- 无 luaL_setfuncs/lua_getextraspace/lua_isinteger
- 无 LUA_REGISTRYINDEX 现代用法差异需逐一核对
后续移植需按 ADAPTATION.md 指引重写 I/O 重定向与 typed interop 层

lib/lua/lundump.h

@@ -1,40 +1,34 @@
 /*
-** $Id: lundump.h $
-** load precompiled Lua chunks
+** $Id: lundump.h,v 1.30 2003/04/07 20:34:20 lhf Exp $
+** load pre-compiled Lua chunks
 ** See Copyright Notice in lua.h
 */
 
 #ifndef lundump_h
 #define lundump_h
 
-#include <limits.h>
-
-#include "llimits.h"
 #include "lobject.h"
 #include "lzio.h"
 
-
-/* data to catch conversion errors */
-#define LUAC_DATA	"\x19\x93\r\n\x1a\n"
-
-#define LUAC_INT	-0x5678
-#define LUAC_INST	0x12345678
-#define LUAC_NUM	cast_num(-370.5)
-
-/*
-** Encode major-minor version in one byte, one nibble for each
-*/
-#define LUAC_VERSION	(LUA_VERSION_MAJOR_N*16+LUA_VERSION_MINOR_N)
-
-#define LUAC_FORMAT	0	/* this is the official format */
-
-
 /* load one chunk; from lundump.c */
-LUAI_FUNC LClosure* luaU_undump (lua_State* L, ZIO* Z, Table *anchor,
-                                 const char* name, int fixed);
+Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff);
+
+/* find byte order; from lundump.c */
+int luaU_endianness (void);
 
 /* dump one chunk; from ldump.c */
-LUAI_FUNC int luaU_dump (lua_State* L, const Proto* f, lua_Writer w,
-                         void* data, int strip);
+void luaU_dump (lua_State* L, const Proto* Main, lua_Chunkwriter w, void* data);
+
+/* print one chunk; from print.c */
+void luaU_print (const Proto* Main);
+
+/* definitions for headers of binary files */
+#define	LUA_SIGNATURE	"\033Lua"	/* binary files start with "<esc>Lua" */
+#define	VERSION		0x50		/* last format change was in 5.0 */
+#define	VERSION0	0x50		/* last major  change was in 5.0 */
+
+/* a multiple of PI for testing native format */
+/* multiplying by 1E7 gives non-trivial integer values */
+#define	TEST_NUMBER	((lua_Number)3.14159265358979323846E7)
 
 #endif