From 340f2f4777e8ad427a364c9c1ef562d40c60cb1d Mon Sep 17 00:00:00 2001
From: Philipp Janda <siffiejoe@gmx.net>
Date: Sat, 13 Jan 2018 19:57:19 +0100
Subject: lua_tointeger(x) rejects non-ints for Lua 5.1.

---
 c-api/compat-5.3.c | 15 +++++++++++----
 c-api/compat-5.3.h |  2 ++
 tests/test.lua     |  5 +++++
 tests/testmod.c    |  3 ++-
 4 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/c-api/compat-5.3.c b/c-api/compat-5.3.c
index b82c654..ebaf03f 100644
--- a/c-api/compat-5.3.c
+++ b/c-api/compat-5.3.c
@@ -205,11 +205,18 @@ COMPAT53_API void lua_rawsetp (lua_State *L, int i, const void *p) {
 
 
 COMPAT53_API lua_Integer lua_tointegerx (lua_State *L, int i, int *isnum) {
-  lua_Integer n = lua_tointeger(L, i);
-  if (isnum != NULL) {
-    *isnum = (n != 0 || lua_isnumber(L, i));
+  int ok = 0;
+  lua_Number n = lua_tonumberx(L, i, &ok);
+  lua_Integer j = (lua_tointeger)(L, i); /* native lua_tointeger */
+  if (isnum == NULL)
+    isnum = &ok;
+  if (ok && n == j) {
+    *isnum = 1;
+    return j;
+  } else {
+    *isnum = 0;
+    return 0;
   }
-  return n;
 }
 
 
diff --git a/c-api/compat-5.3.h b/c-api/compat-5.3.h
index 755c23e..6b6e35c 100644
--- a/c-api/compat-5.3.h
+++ b/c-api/compat-5.3.h
@@ -165,6 +165,8 @@ COMPAT53_API void lua_rawsetp(lua_State *L, int i, const void *p);
 
 #define lua_rawlen(L, i) lua_objlen((L), (i))
 
+#define lua_tointeger(L, i) lua_tointegerx((L), (i), NULL)
+
 #define lua_tointegerx COMPAT53_CONCAT(COMPAT53_PREFIX, _tointegerx)
 COMPAT53_API lua_Integer lua_tointegerx (lua_State *L, int i, int *isnum);
 
diff --git a/tests/test.lua b/tests/test.lua
index 2f6c7f6..c2c0abf 100755
--- a/tests/test.lua
+++ b/tests/test.lua
@@ -705,6 +705,11 @@ print("tonumber", mod.tonumber("error"))
 
 ___''
 print("tointeger", mod.tointeger(12))
+print("tointeger", mod.tointeger(-12))
+print("tointeger", mod.tointeger(12.1))
+print("tointeger", mod.tointeger(12.9))
+print("tointeger", mod.tointeger(-12.1))
+print("tointeger", mod.tointeger(-12.9))
 print("tointeger", mod.tointeger("12"))
 print("tointeger", mod.tointeger("0"))
 print("tointeger", mod.tointeger(math.pi))
diff --git a/tests/testmod.c b/tests/testmod.c
index 9232682..cd56e76 100644
--- a/tests/testmod.c
+++ b/tests/testmod.c
@@ -152,7 +152,8 @@ static int test_tointeger (lua_State *L) {
     lua_pushnil(L);
   else
     lua_pushinteger(L, n);
-  return 1;
+  lua_pushinteger(L, lua_tointeger(L, 1));
+  return 2;
 }
 
 static int test_len (lua_State *L) {
-- 
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