From de79e7fc586c0b60a04823c0e930b227af2828d8 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Thu, 18 Dec 1997 16:32:39 -0200
Subject: back to "lua_upvalue"... (seems better choice)

---
 liolib.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

(limited to 'liolib.c')

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;
-- 
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