From f893be002aebd215b499b0c72803dd1346f4eb05 Mon Sep 17 00:00:00 2001
From: Benoit Giannangeli <giann008@gmail.com>
Date: Fri, 24 Mar 2017 12:23:30 +0100
Subject: Fixed bad lua_tointegerx

---
 src/lapi.js      | 6 +-----
 src/lobject.js   | 3 ++-
 src/luaconf.js   | 2 +-
 src/lvm.js       | 6 ++++--
 tests/single.lua | 7 +++++++
 5 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/src/lapi.js b/src/lapi.js
index 3520b15..d1ca02f 100644
--- a/src/lapi.js
+++ b/src/lapi.js
@@ -652,11 +652,7 @@ const lua_stringtonumber = function(L, s) {
 
 // TODO: pisnum
 const lua_tointegerx = function(L, idx) {
-    let o = index2addr(L, idx);
-    let res = lvm.tointeger(o);
-    if (res === false)
-        res = 0;  /* call to 'tointeger' may change 'n' even if it fails */
-    return res;
+    return lvm.tointeger(index2addr(L, idx));
 };
 
 const f_call = function(L, ud) {
diff --git a/src/lobject.js b/src/lobject.js
index 3cbde26..bdbccb9 100644
--- a/src/lobject.js
+++ b/src/lobject.js
@@ -342,7 +342,8 @@ const l_str2dloc = function(s, mode) {
 };
 
 const l_str2d = function(s) {
-    let pidx = /[.xXnN]/g.exec(s).index;
+    let pidx = /[.xXnN]/g.exec(s);
+    pidx = pidx ? pidx.index : null;
     let pmode = pidx ? s[pidx] : null;
     let mode = pmode ? pmode.toLowerCase() : 0;
     if (mode === 'n')  /* reject 'inf' and 'nan' */
diff --git a/src/luaconf.js b/src/luaconf.js
index a965954..190893a 100644
--- a/src/luaconf.js
+++ b/src/luaconf.js
@@ -17,7 +17,7 @@ const LUAI_MAXSTACK = 1000000;
 const LUA_IDSIZE = 60;
 
 const lua_numbertointeger = function(n) {
-    return n;
+    return n >= Number.MIN_SAFE_INTEGER && n < -Number.MIN_SAFE_INTEGER ? n : 0;
 };
 
 const LUA_INTEGER_FRMLEN = "";
diff --git a/src/lvm.js b/src/lvm.js
index 372c241..c5628cf 100644
--- a/src/lvm.js
+++ b/src/lvm.js
@@ -6,6 +6,7 @@ const assert         = require('assert');
 const BytecodeParser = require('./lundump.js');
 const OC             = require('./lopcodes.js');
 const lua            = require('./lua.js');
+const luaconf        = require('./luaconf.js');
 const CT             = lua.constant_types;
 const LUA_MULTRET    = lua.LUA_MULTRET;
 const lobject        = require('./lobject.js');
@@ -843,7 +844,7 @@ const forlimit = function(obj, step) {
 const luaV_tointeger = function(obj, mode) {
     if (obj.ttisfloat()) {
         let n = obj.value;
-        let f = n;
+        let f = Math.floor(n);
 
         if (n !== f) { /* not an integral value? */
             if (mode === 0)
@@ -852,7 +853,8 @@ const luaV_tointeger = function(obj, mode) {
                 f += 1;  /* convert floor to ceil (remember: n !== f) */
         }
 
-        return f;
+        let res = luaconf.lua_numbertointeger(f);
+        return res !== 0 ? res : (n === 0 ? 0 : false);
     } else if (obj.ttisinteger()) {
         return obj.value;
     } else if (obj.ttisstring()) {
diff --git a/tests/single.lua b/tests/single.lua
index 4960b11..f74c096 100644
--- a/tests/single.lua
+++ b/tests/single.lua
@@ -131,3 +131,10 @@ assert(tostring(-1203) == "-1203")
 assert(tostring(1203.125) == "1203.125")
 assert(tostring(-0.5) == "-0.5")
 assert(tostring(-32767) == "-32767")
+if math.tointeger(2147483647) then   -- no overflow? (32 bits)
+  assert(tostring(-2147483647) == "-2147483647")
+end
+if math.tointeger(4611686018427387904) then   -- no overflow? (64 bits)
+  assert(tostring(4611686018427387904) == "4611686018427387904")
+  assert(tostring(-4611686018427387904) == "-4611686018427387904")
+end
-- 
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