From 456806f25c239bf36039fc2742547547cc55fbb1 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Mon, 26 May 2014 14:13:52 -0300
Subject: no more 'math.ifloor' + new semantics for 'math.floor'/'math.ceil'

---
 lmathlib.c | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

(limited to 'lmathlib.c')

diff --git a/lmathlib.c b/lmathlib.c
index 0762d5dd..3df4b799 100644
--- a/lmathlib.c
+++ b/lmathlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lmathlib.c,v 1.99 2014/05/02 16:36:51 roberto Exp roberto $
+** $Id: lmathlib.c,v 1.100 2014/05/14 16:59:27 roberto Exp roberto $
 ** Standard mathematical library
 ** See Copyright Notice in lua.h
 */
@@ -75,28 +75,32 @@ static int math_atan (lua_State *L) {
   return 1;
 }
 
-static int math_ceil (lua_State *L) {
-  lua_pushnumber(L, l_mathop(ceil)(luaL_checknumber(L, 1)));
-  return 1;
-}
 
 static int math_floor (lua_State *L) {
-  lua_pushnumber(L, l_mathop(floor)(luaL_checknumber(L, 1)));
-  return 1;
-}
-
-static int math_ifloor (lua_State *L) {
   int valid;
   lua_Integer n = lua_tointegerx(L, 1, &valid);
   if (valid)
-    lua_pushinteger(L, n);
+    lua_pushinteger(L, n);  /* floor computed by Lua */
+  else
+    lua_pushnumber(L, l_mathop(floor)(luaL_checknumber(L, 1)));
+  return 1;
+}
+
+static int math_ceil (lua_State *L) {
+  if (lua_isinteger(L, 1))
+    lua_settop(L, 1);  /* integer is its own ceil */
   else {
-    luaL_checktype(L, 1, LUA_TNUMBER);  /* error if not a number */
-    lua_pushnil(L);  /* number with invalid integer value */
+    lua_Integer n;
+    lua_Number d = l_mathop(ceil)(luaL_checknumber(L, 1));
+    if (lua_numtointeger(d, &n))  /* fits in an integer? */
+      lua_pushinteger(L, n);  /* result is integer */
+    else
+      lua_pushnumber(L, d);  /* result is float */
   }
   return 1;
 }
 
+
 static int math_fmod (lua_State *L) {
   if (lua_isinteger(L, 1) && lua_isinteger(L, 2)) {
     lua_Integer d = lua_tointeger(L, 2);
@@ -113,6 +117,7 @@ static int math_fmod (lua_State *L) {
   return 1;
 }
 
+
 /*
 ** next function does not use 'modf', avoiding problems with 'double*'
 ** (which is not compatible with 'float*') when lua_Number is not
@@ -310,7 +315,6 @@ static const luaL_Reg mathlib[] = {
   {"deg",   math_deg},
   {"exp",   math_exp},
   {"floor", math_floor},
-  {"ifloor", math_ifloor},
   {"fmod",   math_fmod},
   {"log",   math_log},
   {"max",   math_max},
-- 
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