5 files changed, 27 insertions, 29 deletions
diff --git a/lapi.c b/lapi.c
index 3899bb86..464ef60a 100644
--- a/lapi.c
+++ b/lapi.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.c,v 1.13 1997/12/11 14:48:46 roberto Exp roberto $
+** $Id: lapi.c,v 1.14 1997/12/15 16:17:20 roberto Exp roberto $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
@@ -124,6 +124,15 @@ lua_Object lua_lua2C (int number)
 }
+lua_Object lua_upvalue (int n)
+{
+  TObject *f = L->stack.stack+L->Cstack.lua2C-1;
+  if (ttype(f) != LUA_T_CLMARK || n <= 0 || n > clvalue(f)->nelems)
+    return LUA_NOOBJECT;
+  return put_luaObject(&clvalue(f)->consts[n]);
+}
 int lua_callfunction (lua_Object function)
 {
  if (function == LUA_NOOBJECT)
diff --git a/lbuiltin.c b/lbuiltin.c
index fa83e58a..da2c915c 100644
--- a/lbuiltin.c
+++ b/lbuiltin.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbuiltin.c,v 1.17 1997/12/15 16:17:20 roberto Exp roberto $
+** $Id: lbuiltin.c,v 1.18 1997/12/17 20:48:58 roberto Exp roberto $
 ** Built-in functions
 ** See Copyright Notice in lua.h
 */
@@ -427,6 +427,7 @@ static void testC (void)
      case 'r': { int n=getnum(s); reg[n]=lua_getref(locks[getnum(s)]); break; }
      case 'u': lua_unref(locks[getnum(s)]); break;
      case 'p': { int n = getnum(s); reg[n] = lua_getparam(getnum(s)); break; }
+      case 'U': { int n = getnum(s); reg[n] = lua_upvalue(getnum(s)); break; }
      case '=': lua_setglobal(getname(s)); break;
      case 's': lua_pushstring(getname(s)); break;
      case 'o': lua_pushobject(reg[getnum(s)]); break;
diff --git a/ldo.c b/ldo.c
index 01af05c4..8ab4854f 100644
--- a/ldo.c
+++ b/ldo.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.c,v 1.15 1997/12/15 16:17:20 roberto Exp roberto $
+** $Id: ldo.c,v 1.16 1997/12/17 20:57:20 roberto Exp roberto $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
@@ -140,22 +140,12 @@ void luaD_callHook (StkId base, TProtoFunc *tf, int isreturn)
 ** Cstack.num is the number of arguments; Cstack.lua2C points to the
 ** first argument. Returns an index to the first result from C.
 */
-static StkId callC (struct Closure *cl, lua_CFunction f, StkId base)
+static StkId callC (lua_CFunction f, StkId base)
 {
  struct C_Lua_Stack *CS = &L->Cstack;
  struct C_Lua_Stack oldCLS = *CS;
  StkId firstResult;
  int numarg = (L->stack.top-L->stack.stack) - base;
-  if (cl) {  /* are there upvalues? */
-    int i;
-    luaD_checkstack(cl->nelems);
-    for (i=1; i<=numarg; i++)  /* open space */
-      *(L->stack.top+cl->nelems-i) = *(L->stack.top-i);
-    /* copy upvalues to stack */
-    memcpy(L->stack.top-numarg, cl->consts+1, cl->nelems*sizeof(TObject));
-    L->stack.top += cl->nelems;
-    numarg += cl->nelems;
-  }
  CS->num = numarg;
  CS->lua2C = base;
  CS->base = base+numarg;  /* == top-stack */
@@ -192,7 +182,7 @@ void luaD_call (StkId base, int nResults)
  switch (ttype(func)) {
    case LUA_T_CPROTO:
      ttype(func) = LUA_T_CMARK;
-      firstResult = callC(NULL, fvalue(func), base);
+      firstResult = callC(fvalue(func), base);
      break;
    case LUA_T_PROTO:
      ttype(func) = LUA_T_PMARK;
@@ -203,7 +193,7 @@ void luaD_call (StkId base, int nResults)
      TObject *proto = &(c->consts[0]);
      ttype(func) = LUA_T_CLMARK;
      firstResult = (ttype(proto) == LUA_T_CPROTO) ?
-                       callC(c, fvalue(proto), base) :
+                       callC(fvalue(proto), base) :
                       luaV_execute(c, tfvalue(proto), base);
      break;
    }
diff --git a/liolib.c b/liolib.c
index 46c4e87c..7a61560f 100644
--- a/liolib.c
+++ b/liolib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: liolib.c,v 1.9 1997/12/09 13:50:08 roberto Exp roberto $
+** $Id: liolib.c,v 1.10 1997/12/17 20:48:58 roberto Exp roberto $
 ** Standard I/O (and system) library
 ** See Copyright Notice in lua.h
 */
@@ -39,9 +39,6 @@
 #define FOUTPUT         "_OUTPUT"
-#define FIRSTARG        3  /* 1st and 2nd are upvalues */
 #ifdef POPEN
 FILE *popen();
 int pclose();
@@ -53,7 +50,7 @@ int pclose();
 static int gettag (int i)
 {
-  return lua_getnumber(lua_getparam(i));
+  return lua_getnumber(lua_upvalue(i));
 }
@@ -128,7 +125,7 @@ static void setreturn (FILE *f, char *name)
 static void io_readfrom (void)
 {
  FILE *current;
-  lua_Object f = lua_getparam(FIRSTARG);
+  lua_Object f = lua_getparam(1);
  if (f == LUA_NOOBJECT) {
    closefile(FINPUT);
    current = stdin;
@@ -136,7 +133,7 @@ static void io_readfrom (void)
  else if (lua_tag(f) == gettag(IOTAG))
    current = lua_getuserdata(f);
  else {
-    char *s = luaL_check_string(FIRSTARG);
+    char *s = luaL_check_string(1);
    current = (*s == '|') ? popen(s+1, "r") : fopen(s, "r");
    if (current == NULL) {
      pushresult(0);
@@ -150,7 +147,7 @@ static void io_readfrom (void)
 static void io_writeto (void)
 {
  FILE *current;
-  lua_Object f = lua_getparam(FIRSTARG);
+  lua_Object f = lua_getparam(1);
  if (f == LUA_NOOBJECT) {
    closefile(FOUTPUT);
    current = stdout;
@@ -158,7 +155,7 @@ static void io_writeto (void)
  else if (lua_tag(f) == gettag(IOTAG))
    current = lua_getuserdata(f);
  else {
-    char *s = luaL_check_string(FIRSTARG);
+    char *s = luaL_check_string(1);
    current = (*s == '|') ? popen(s+1,"w") : fopen(s,"w");
    if (current == NULL) {
      pushresult(0);
@@ -171,7 +168,7 @@ static void io_writeto (void)
 static void io_appendto (void)
 {
-  char *s = luaL_check_string(FIRSTARG);
+  char *s = luaL_check_string(1);
  FILE *fp = fopen (s, "a");
  if (fp != NULL)
    setreturn(fp, FOUTPUT);
@@ -184,7 +181,7 @@ static void io_appendto (void)
 static void io_read (void)
 {
-  int arg = FIRSTARG;
+  int arg = 1;
  FILE *f = getfileparam(FINPUT, &arg);
  char *buff;
  char *p = luaL_opt_string(arg, "[^\n]*{\n}");
@@ -236,7 +233,7 @@ static void io_read (void)
 static void io_write (void)
 {
-  int arg = FIRSTARG;
+  int arg = 1;
  FILE *f = getfileparam(FOUTPUT, &arg);
  int status = 1;
  char *s;
diff --git a/lua.h b/lua.h
index 5dae0dbc..bb9b65dd 100644
--- a/lua.h
+++ b/lua.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lua.h,v 1.10 1997/12/11 17:21:11 roberto Exp roberto $
+** $Id: lua.h,v 1.11 1997/12/15 17:47:55 roberto Exp roberto $
 ** Lua - An Extensible Extension Language
 ** TeCGraf: Grupo de Tecnologia em Computacao Grafica, PUC-Rio, Brazil
 ** e-mail: lua@tecgraf.puc-rio.br
@@ -77,6 +77,7 @@ void	       lua_beginblock		(void);
 void           lua_endblock             (void);
 lua_Object     lua_lua2C                (int number);
+lua_Object     lua_upvalue              (int n);
 #define        lua_getparam(_)          lua_lua2C(_)
 #define        lua_getresult(_)         lua_lua2C(_)