removed coercion string->number in bitwise operations

(can be done with a Lua module)

lstrlib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lstrlib.c,v 1.260 2017/11/23 19:29:04 roberto Exp roberto $
+** $Id: lstrlib.c,v 1.261 2018/02/21 13:48:44 roberto Exp roberto $
 ** Standard library for string operations and pattern-matching
 ** See Copyright Notice in lua.h
 */
@@ -220,25 +220,6 @@ static int tonum (lua_State *L, int arg) {
 }
 
 
-static int toint (lua_State *L, int arg) {
-  if (!tonum(L, arg))
-    return 0;  /* not coercible to a number */
-  else if (lua_isinteger(L, arg))
-    return 1;  /* already an integer */
-  else {  /* a float */
-    int ok;
-    lua_Integer n = lua_tointegerx(L, arg, &ok);
-    if (!ok)
-      return 0;
-    else {
-      lua_pop(L, 1);  /* remove the float */
-      lua_pushinteger(L, n);  /* push an integer */
-      return 1;
-    }
-  }
-}
-
-
 static void trymt (lua_State *L, const char *mtname) {
   lua_settop(L, 2);  /* back to the original arguments */
   if (lua_type(L, 2) == LUA_TSTRING || !luaL_getmetafield(L, 2, mtname))
@@ -258,15 +239,6 @@ static int arith (lua_State *L, int op, const char *mtname) {
 }
 
 
-static int bitwise (lua_State *L, int op, const char *mtname) {
-  if (toint(L, 1) && toint(L, 2))
-    lua_arith(L, op);  /* result will be on the top */
-  else
-    trymt(L, mtname);
-  return 1;
-}
-
-
 static int arith_add (lua_State *L) {
   return arith(L, LUA_OPADD, "__add");
 }
@@ -299,30 +271,6 @@ static int arith_unm (lua_State *L) {
   return arith(L, LUA_OPUNM, "__unm");
 }
 
-static int bitwise_band (lua_State *L) {
-  return bitwise(L, LUA_OPBAND, "__band");
-}
-
-static int bitwise_bor (lua_State *L) {
-  return bitwise(L, LUA_OPBOR, "__bor");
-}
-
-static int bitwise_bxor (lua_State *L) {
-  return bitwise(L, LUA_OPBXOR, "__bxor");
-}
-
-static int bitwise_shl (lua_State *L) {
-  return bitwise(L, LUA_OPSHL, "__shl");
-}
-
-static int bitwise_shr (lua_State *L) {
-  return bitwise(L, LUA_OPSHR, "__shr");
-}
-
-static int bitwise_bnot (lua_State *L) {
-  return bitwise(L, LUA_OPBNOT, "__bnot");
-}
-
 
 static const luaL_Reg stringmetamethods[] = {
   {"__add", arith_add},
@@ -333,12 +281,6 @@ static const luaL_Reg stringmetamethods[] = {
   {"__div", arith_div},
   {"__idiv", arith_idiv},
   {"__unm", arith_unm},
-  {"__band", bitwise_band},
-  {"__bor", bitwise_bor},
-  {"__bxor", bitwise_bxor},
-  {"__shl", bitwise_shl},
-  {"__shr", bitwise_shr},
-  {"__bnot", bitwise_bnot},
   {"__index", NULL},  /* placeholder */
   {NULL, NULL}
 };