From 0dc09cb42e558aabf9ffca397b5588e6ee2fecfa Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Mon, 28 Dec 2009 14:30:31 -0200
Subject: [PATCH] 'unpack' moved to table library (and therefore "renamed" to
 'table.unpack'.

---
 lbaselib.c | 19 +------------------
 ltablib.c  | 26 ++++++++++++++++++++++++--
 luaconf.h  |  9 ++++++++-
 3 files changed, 33 insertions(+), 21 deletions(-)

diff --git a/lbaselib.c b/lbaselib.c
index 6e176990..0554ba55 100644
--- a/lbaselib.c
+++ b/lbaselib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbaselib.c,v 1.233 2009/12/17 16:20:01 roberto Exp roberto $
+** $Id: lbaselib.c,v 1.234 2009/12/22 15:32:50 roberto Exp roberto $
 ** Basic library
 ** See Copyright Notice in lua.h
 */
@@ -412,22 +412,6 @@ static int luaB_assert (lua_State *L) {
 }
 
 
-static int luaB_unpack (lua_State *L) {
-  int i, e, n;
-  luaL_checktype(L, 1, LUA_TTABLE);
-  i = luaL_optint(L, 2, 1);
-  e = luaL_opt(L, luaL_checkint, 3, (int)lua_rawlen(L, 1));
-  if (i > e) return 0;  /* empty range */
-  n = e - i + 1;  /* number of elements */
-  if (n <= 0 || !lua_checkstack(L, n))  /* n <= 0 means arith. overflow */
-    return luaL_error(L, "too many results to unpack");
-  lua_rawgeti(L, 1, i);  /* push arg[i] (avoiding overflow problems) */
-  while (i++ < e)  /* push arg[i + 1...e] */
-    lua_rawgeti(L, 1, i);
-  return n;
-}
-
-
 static int luaB_select (lua_State *L) {
   int n = lua_gettop(L);
   if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
@@ -542,7 +526,6 @@ static const luaL_Reg base_funcs[] = {
   {"tonumber", luaB_tonumber},
   {"tostring", luaB_tostring},
   {"type", luaB_type},
-  {"unpack", luaB_unpack},
   {"xpcall", luaB_xpcall},
   {NULL, NULL}
 };
diff --git a/ltablib.c b/ltablib.c
index 9a089932..a288633a 100644
--- a/ltablib.c
+++ b/ltablib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltablib.c,v 1.51 2009/12/17 16:20:01 roberto Exp roberto $
+** $Id: ltablib.c,v 1.52 2009/12/18 16:53:12 roberto Exp roberto $
 ** Library for Table Manipulation
 ** See Copyright Notice in lua.h
 */
@@ -164,7 +164,7 @@ static int tconcat (lua_State *L) {
 
 /*
 ** {======================================================
-** Pack
+** Pack/unpack
 ** =======================================================
 */
 
@@ -181,6 +181,22 @@ static int pack (lua_State *L) {
   return 1;
 }
 
+
+static int unpack (lua_State *L) {
+  int i, e, n;
+  luaL_checktype(L, 1, LUA_TTABLE);
+  i = luaL_optint(L, 2, 1);
+  e = luaL_opt(L, luaL_checkint, 3, (int)lua_rawlen(L, 1));
+  if (i > e) return 0;  /* empty range */
+  n = e - i + 1;  /* number of elements */
+  if (n <= 0 || !lua_checkstack(L, n))  /* n <= 0 means arith. overflow */
+    return luaL_error(L, "too many results to unpack");
+  lua_rawgeti(L, 1, i);  /* push arg[i] (avoiding overflow problems) */
+  while (i++ < e)  /* push arg[i + 1...e] */
+    lua_rawgeti(L, 1, i);
+  return n;
+}
+
 /* }====================================================== */
 
 
@@ -298,6 +314,7 @@ static const luaL_Reg tab_funcs[] = {
   {"maxn", maxn},
   {"insert", tinsert},
   {"pack", pack},
+  {"unpack", unpack},
   {"remove", tremove},
   {"sort", sort},
   {NULL, NULL}
@@ -306,6 +323,11 @@ static const luaL_Reg tab_funcs[] = {
 
 LUAMOD_API int luaopen_table (lua_State *L) {
   luaL_register(L, LUA_TABLIBNAME, tab_funcs);
+#if defined(LUA_COMPAT_UNPACK)
+  /* _G.unpack = table.unpack */
+  lua_getfield(L, -1, "unpack");
+  lua_setfield(L, LUA_ENVIRONINDEX, "unpack");
+#endif
   return 1;
 }
 
diff --git a/luaconf.h b/luaconf.h
index 0768c9f4..4a9703ab 100644
--- a/luaconf.h
+++ b/luaconf.h
@@ -1,5 +1,5 @@
 /*
-** $Id: luaconf.h,v 1.124 2009/12/17 13:08:51 roberto Exp roberto $
+** $Id: luaconf.h,v 1.125 2009/12/22 16:47:00 roberto Exp roberto $
 ** Configuration file for Lua
 ** See Copyright Notice in lua.h
 */
@@ -205,6 +205,13 @@
 ** ===================================================================
 */
 
+/*
+@@ LUA_COMPAT_UNPACK controls the presence of global 'unpack'.
+** CHANGE it (define it) if you have not replaced its uses with
+** 'table.unpack'.
+*/
+/* #define LUA_COMPAT_UNPACK */
+
 /*
 @@ LUA_COMPAT_CPCALL controls the presence of function 'lua_cpcall'.
 ** CHANGE it (define it) if you need this function.  (You can replace