new definition for 'luai_nummod' (using 'fmod')

lobject.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.c,v 2.75 2014/03/06 16:15:18 roberto Exp roberto $
+** $Id: lobject.c,v 2.76 2014/03/21 13:52:33 roberto Exp roberto $
 ** Some generic functions over Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -98,9 +98,13 @@ static lua_Number numarith (lua_State *L, int op, lua_Number v1,
     case LUA_OPSUB: return luai_numsub(L, v1, v2);
     case LUA_OPMUL: return luai_nummul(L, v1, v2);
     case LUA_OPDIV: return luai_numdiv(L, v1, v2);
-    case LUA_OPMOD: return luai_nummod(L, v1, v2);
     case LUA_OPPOW: return luai_numpow(L, v1, v2);
     case LUA_OPUNM: return luai_numunm(L, v1);
+    case LUA_OPMOD: {
+      lua_Number m;
+      luai_nummod(L, v1, v2, m);
+      return m;
+    }
     default: lua_assert(0); return 0;
   }
 }

luaconf.h

@@ -1,5 +1,5 @@
 /*
-** $Id: luaconf.h,v 1.193 2014/03/21 14:27:16 roberto Exp roberto $
+** $Id: luaconf.h,v 1.194 2014/04/03 14:18:02 roberto Exp $
 ** Configuration file for Lua
 ** See Copyright Notice in lua.h
 */
@@ -497,7 +497,8 @@
 /* the following operations need the math library */
 #if defined(lobject_c) || defined(lvm_c)
 #include <math.h>
-#define luai_nummod(L,a,b)	((void)L, (a) - l_floor((a)/(b))*(b))
+#define luai_nummod(L,a,b,m)  \
+  { (m) = l_mathop(fmod)(a,b); if ((m) != 0 && (a)*(b) < 0) (m) += (b); }
 #define luai_numpow(L,a,b)	((void)L, l_mathop(pow)(a,b))
 #endif
 

lvm.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.193 2014/04/02 16:54:20 roberto Exp roberto $
+** $Id: lvm.c,v 2.194 2014/04/08 14:28:04 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -755,7 +755,9 @@ void luaV_execute (lua_State *L) {
           setivalue(ra, luaV_mod(L, ib, ic));
         }
         else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
-          setnvalue(ra, luai_nummod(L, nb, nc));
+          lua_Number m;
+          luai_nummod(L, nb, nc, m);
+          setnvalue(ra, m);
         }
         else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_MOD)); }
       )