vendor: 引入 Lua 4.0.1 官方源码 + 移植评估文档 (lua_4.0 分支)

- Lua 4.0 是首个引入 lua_State* 的版本, 但 API 与 5.x 代际差异大
- 桥接层适配要点与工作量评估见 doc/ADAPTATION-lua40.md
- 本分支暂不承诺可编译, 后续按需移植

lib/lua/lzio.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lzio.h $
+** $Id: lzio.h,v 1.7 2000/10/20 16:36:32 roberto Exp $
 ** Buffered streams
 ** See Copyright Notice in lua.h
 */
@@ -8,60 +8,46 @@
 #ifndef lzio_h
 #define lzio_h
 
-#include "lua.h"
+#include <stdio.h>
 
-#include "lmem.h"
 
 
+/* For Lua only */
+#define zFopen	luaZ_Fopen
+#define zsopen	luaZ_sopen
+#define zmopen	luaZ_mopen
+#define zread	luaZ_read
+
 #define EOZ	(-1)			/* end of stream */
 
-typedef struct Zio ZIO;
+typedef struct zio ZIO;
 
-#define zgetc(z)  (((z)->n--)>0 ?  cast_uchar(*(z)->p++) : luaZ_fill(z))
+ZIO* zFopen (ZIO* z, FILE* f, const char *name);	/* open FILEs */
+ZIO* zsopen (ZIO* z, const char* s, const char *name);	/* string */
+ZIO* zmopen (ZIO* z, const char* b, size_t size, const char *name); /* memory */
 
+size_t zread (ZIO* z, void* b, size_t n);	/* read next n bytes */
 
-typedef struct Mbuffer {
-  char *buffer;
-  size_t n;
-  size_t buffsize;
-} Mbuffer;
+#define zgetc(z)	(((z)->n--)>0 ? ((int)*(z)->p++): (z)->filbuf(z))
+#define zungetc(z)	(++(z)->n,--(z)->p)
+#define zname(z)	((z)->name)
 
-#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
-
-#define luaZ_buffer(buff)	((buff)->buffer)
-#define luaZ_sizebuffer(buff)	((buff)->buffsize)
-#define luaZ_bufflen(buff)	((buff)->n)
-
-#define luaZ_buffremove(buff,i)	((buff)->n -= cast_sizet(i))
-#define luaZ_resetbuffer(buff) ((buff)->n = 0)
-
-
-#define luaZ_resizebuffer(L, buff, size) \
-	((buff)->buffer = luaM_reallocvchar(L, (buff)->buffer, \
-				(buff)->buffsize, size), \
-	(buff)->buffsize = size)
-
-#define luaZ_freebuffer(L, buff)	luaZ_resizebuffer(L, buff, 0)
-
-
-LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
-                                        void *data);
-LUAI_FUNC size_t luaZ_read (ZIO* z, void *b, size_t n);	/* read next n bytes */
-
-LUAI_FUNC const void *luaZ_getaddr (ZIO* z, size_t n);
 
 
 /* --------- Private Part ------------------ */
 
-struct Zio {
-  size_t n;			/* bytes still unread */
-  const char *p;		/* current position in buffer */
-  lua_Reader reader;		/* reader function */
-  void *data;			/* additional data */
-  lua_State *L;			/* Lua state (for reader) */
+#ifndef ZBSIZE
+#define ZBSIZE	256			/* buffer size */
+#endif
+
+struct zio {
+  size_t n;				/* bytes still unread */
+  const unsigned char* p;		/* current position in buffer */
+  int (*filbuf)(ZIO* z);
+  void* u;				/* additional data */
+  const char *name;
+  unsigned char buffer[ZBSIZE];		/* buffer */
 };
 
 
-LUAI_FUNC int luaZ_fill (ZIO *z);
-
 #endif