From 055823c04d09f6da0df1d7b5761609f749042907 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Thu, 25 Feb 1999 12:17:01 -0300
Subject: "L->Mbuffbase" is better kept as offset instead of pointer

---
 lbuffer.c | 55 +++++++++++++++++++++----------------------------------
 llex.c    | 14 +++++++-------
 lstate.c  |  4 ++--
 lstate.h  |  4 ++--
 4 files changed, 32 insertions(+), 45 deletions(-)

diff --git a/lbuffer.c b/lbuffer.c
index 6bcc9c5a..b334f252 100644
--- a/lbuffer.c
+++ b/lbuffer.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbuffer.c,v 1.4 1998/06/19 16:14:09 roberto Exp roberto $
+** $Id: lbuffer.c,v 1.5 1998/12/28 13:44:54 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -16,70 +16,57 @@
 **  Auxiliary buffer
 -------------------------------------------------------*/
 
-#define BUFF_STEP	32
 
 #define openspace(size)  if (L->Mbuffnext+(size) > L->Mbuffsize) Openspace(size)
 
-static void Openspace (int size)
-{
+static void Openspace (int size) {
   lua_State *l = L;  /* to optimize */
-  int base = l->Mbuffbase-l->Mbuffer;
-  l->Mbuffsize *= 2;
-  if (l->Mbuffnext+size > l->Mbuffsize)  /* still not big enough? */
-    l->Mbuffsize = l->Mbuffnext+size;
-  l->Mbuffer = luaM_realloc(l->Mbuffer, l->Mbuffsize);
-  l->Mbuffbase = l->Mbuffer+base;
+  l->Mbuffsize = l->Mbuffnext+size;
+  l->Mbuffer =  luaM_growvector(l->Mbuffer, l->Mbuffnext, size, char,
+                                memEM, MAX_INT);
 }
 
 
-char *luaL_openspace (int size)
-{
+char *luaL_openspace (int size) {
   openspace(size);
   return L->Mbuffer+L->Mbuffnext;
 }
 
 
-void luaL_addchar (int c)
-{
-  openspace(BUFF_STEP);
+void luaL_addchar (int c) {
+  openspace(1);
   L->Mbuffer[L->Mbuffnext++] = (char)c;
 }
 
 
-void luaL_resetbuffer (void)
-{
-  L->Mbuffnext = L->Mbuffbase-L->Mbuffer;
+void luaL_resetbuffer (void) {
+  L->Mbuffnext = L->Mbuffbase;
 }
 
 
-void luaL_addsize (int n)
-{
+void luaL_addsize (int n) {
   L->Mbuffnext += n;
 }
 
-int luaL_getsize (void)
-{
-  return L->Mbuffnext-(L->Mbuffbase-L->Mbuffer);
+int luaL_getsize (void) {
+  return L->Mbuffnext-L->Mbuffbase;
 }
 
-int luaL_newbuffer (int size)
-{
-  int old = L->Mbuffbase-L->Mbuffer;
+int luaL_newbuffer (int size) {
+  int old = L->Mbuffbase;
   openspace(size);
-  L->Mbuffbase = L->Mbuffer+L->Mbuffnext;
+  L->Mbuffbase = L->Mbuffnext;
   return old;
 }
 
 
-void luaL_oldbuffer (int old)
-{
-  L->Mbuffnext = L->Mbuffbase-L->Mbuffer;
-  L->Mbuffbase = L->Mbuffer+old;
+void luaL_oldbuffer (int old) {
+  L->Mbuffnext = L->Mbuffbase;
+  L->Mbuffbase = old;
 }
 
 
-char *luaL_buffer (void)
-{
-  return L->Mbuffbase;
+char *luaL_buffer (void) {
+  return L->Mbuffer+L->Mbuffbase;
 }
 
diff --git a/llex.c b/llex.c
index 27850864..9b74543b 100644
--- a/llex.c
+++ b/llex.c
@@ -1,5 +1,5 @@
 /*
-** $Id: llex.c,v 1.27 1998/12/28 13:44:54 roberto Exp roberto $
+** $Id: llex.c,v 1.28 1999/02/04 17:47:59 roberto Exp roberto $
 ** Lexical Analizer
 ** See Copyright Notice in lua.h
 */
@@ -258,8 +258,8 @@ static int read_long_string (LexState *LS) {
     }
   } endloop:
   save_and_next(LS);  /* skip the second ']' */
-  LS->seminfo.ts = luaS_newlstr(L->Mbuffbase+2,
-                          L->Mbuffnext-(L->Mbuffbase-L->Mbuffer)-4);
+  LS->seminfo.ts = luaS_newlstr(L->Mbuffer+(L->Mbuffbase+2),
+                          L->Mbuffnext-L->Mbuffbase-4);
   return STRING;
 }
 
@@ -358,8 +358,8 @@ int luaX_lex (LexState *LS) {
           }
         }
         save_and_next(LS);  /* skip delimiter */
-        LS->seminfo.ts = luaS_newlstr(L->Mbuffbase+1,
-                                L->Mbuffnext-(L->Mbuffbase-L->Mbuffer)-2);
+        LS->seminfo.ts = luaS_newlstr(L->Mbuffer+(L->Mbuffbase+1),
+                                L->Mbuffnext-L->Mbuffbase-2);
         return STRING;
       }
 
@@ -401,7 +401,7 @@ int luaX_lex (LexState *LS) {
             save_and_next(LS);
         }
         save('\0');
-        LS->seminfo.r = luaO_str2d(L->Mbuffbase);
+        LS->seminfo.r = luaO_str2d(L->Mbuffer+L->Mbuffbase);
         if (LS->seminfo.r < 0)
           luaX_error(LS, "invalid numeric format");
         return NUMBER;
@@ -425,7 +425,7 @@ int luaX_lex (LexState *LS) {
             save_and_next(LS);
           } while (isalnum(LS->current) || LS->current == '_');
           save('\0');
-          ts = luaS_new(L->Mbuffbase);
+          ts = luaS_new(L->Mbuffer+L->Mbuffbase);
           if (ts->head.marked >= FIRST_RESERVED)
             return ts->head.marked;  /* reserved word */
           LS->seminfo.ts = ts;
diff --git a/lstate.c b/lstate.c
index 88c7b473..f953f08f 100644
--- a/lstate.c
+++ b/lstate.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.c,v 1.7 1999/01/15 13:11:22 roberto Exp roberto $
+** $Id: lstate.c,v 1.8 1999/02/04 17:47:59 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -44,7 +44,7 @@ void lua_open (void)
   L->refSize = 0;
   L->Mbuffsize = 0;
   L->Mbuffnext = 0;
-  L->Mbuffbase = NULL;
+  L->Mbuffbase = 0;
   L->Mbuffer = NULL;
   L->GCthreshold = GARBAGE_BLOCK;
   L->nblocks = 0;
diff --git a/lstate.h b/lstate.h
index b8d15a6c..43598917 100644
--- a/lstate.h
+++ b/lstate.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.h,v 1.13 1998/08/30 18:28:58 roberto Exp roberto $
+** $Id: lstate.h,v 1.14 1999/02/04 17:47:59 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -56,7 +56,7 @@ struct lua_State {
   struct C_Lua_Stack Cstack;  /* C2lua struct */
   jmp_buf *errorJmp;  /* current error recover point */
   char *Mbuffer;  /* global buffer */
-  char *Mbuffbase;  /* current first position of Mbuffer */
+  int Mbuffbase;  /* current first position of Mbuffer */
   int Mbuffsize;  /* size of Mbuffer */
   int Mbuffnext;  /* next position to fill in Mbuffer */
   struct C_Lua_Stack Cblocks[MAX_C_BLOCKS];
-- 
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