"L->Mbuffbase" is better kept as offset instead of pointer

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;
 }