when possible, library functions accept nil as none

lauxlib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.c,v 1.61 2002/03/07 18:15:10 roberto Exp roberto $
+** $Id: lauxlib.c,v 1.62 2002/03/20 12:54:08 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -93,7 +93,7 @@ LUALIB_API const char *luaL_check_lstr (lua_State *L, int narg, size_t *len) {
 
 
 LUALIB_API const char *luaL_opt_lstr (lua_State *L, int narg, const char *def, size_t *len) {
-  if (lua_isnone(L, narg)) {
+  if (lua_isnoneornil(L, narg)) {
     if (len)
       *len = (def ? strlen(def) : 0);
     return def;
@@ -111,7 +111,7 @@ LUALIB_API lua_Number luaL_check_number (lua_State *L, int narg) {
 
 
 LUALIB_API lua_Number luaL_opt_number (lua_State *L, int narg, lua_Number def) {
-  if (lua_isnone(L, narg)) return def;
+  if (lua_isnoneornil(L, narg)) return def;
   else return luaL_check_number(L, narg);
 }
 

lbaselib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lbaselib.c,v 1.60 2002/03/20 12:54:08 roberto Exp roberto $
+** $Id: lbaselib.c,v 1.61 2002/03/27 12:49:53 roberto Exp roberto $
 ** Basic library
 ** See Copyright Notice in lua.h
 */
@@ -620,7 +620,7 @@ static void set2 (lua_State *L, int i, int j) {
 
 static int sort_comp (lua_State *L, int a, int b) {
   /* WARNING: the caller (auxsort) must ensure stack space */
-  if (!lua_isnil(L, 2)) {  /* function? */
+  if (!lua_isnoneornil(L, 2)) {  /* function? */
     int res;
     lua_pushvalue(L, 2);
     lua_pushvalue(L, a-1);  /* -1 to compensate function */

ldblib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: ldblib.c,v 1.43 2002/02/07 17:24:32 roberto Exp roberto $
+** $Id: ldblib.c,v 1.44 2002/03/20 12:54:08 roberto Exp roberto $
 ** Interface from Lua to its debug API
 ** See Copyright Notice in lua.h
 */
@@ -141,7 +141,7 @@ static void linef (lua_State *L, lua_Debug *ar) {
 static void sethook (lua_State *L, const char *key, lua_Hook hook,
                      lua_Hook (*sethookf)(lua_State * L, lua_Hook h)) {
   lua_settop(L, 1);
-  if (lua_isnil(L, 1))
+  if (lua_isnoneornil(L, 1))
     (*sethookf)(L, NULL);
   else if (lua_isfunction(L, 1))
     (*sethookf)(L, hook);

liolib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: liolib.c,v 1.131 2002/02/08 22:39:56 roberto Exp roberto $
+** $Id: liolib.c,v 1.132 2002/03/20 12:54:08 roberto Exp roberto $
 ** Standard I/O (and system) library
 ** See Copyright Notice in lua.h
 */
@@ -406,7 +406,7 @@ static int io_seek (lua_State *L) {
 
 
 static int io_flush (lua_State *L) {
-  FILE *f = (lua_isnone(L, 1)) ? (FILE *)(NULL) :
+  FILE *f = (lua_isnoneornil(L, 1)) ? (FILE *)(NULL) :
                                  (FILE *)(luaL_check_userdata(L, 1, FILEHANDLE));
   return pushresult(L, fflush(f) == 0);
 }
@@ -541,7 +541,7 @@ static int io_date (lua_State *L) {
 
 
 static int io_time (lua_State *L) {
-  if (lua_isnone(L, 1))  /* called without args? */
+  if (lua_isnoneornil(L, 1))  /* called without args? */
     lua_pushnumber(L, time(NULL));  /* return current time */
   else {
     time_t t;
@@ -581,8 +581,7 @@ static int io_setloc (lua_State *L) {
      "numeric", "time", NULL};
   const char *l = lua_tostring(L, 1);
   int op = luaL_findstring(luaL_opt_string(L, 2, "all"), catnames);
-  luaL_arg_check(L, l || lua_isnil(L, 1) || lua_isnone(L, 1), 1,
-                 "string expected");
+  luaL_arg_check(L, l || lua_isnoneornil(L, 1), 1, "string expected");
   luaL_arg_check(L, op != -1, 2, "invalid option");
   lua_pushstring(L, setlocale(cat[op], l));
   return 1;

lua.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lua.h,v 1.123 2002/03/18 18:18:35 roberto Exp roberto $
+** $Id: lua.h,v 1.124 2002/03/27 12:49:53 roberto Exp roberto $
 ** Lua - An Extensible Extension Language
 ** TeCGraf: Grupo de Tecnologia em Computacao Grafica, PUC-Rio, Brazil
 ** e-mail: info@lua.org
@@ -229,6 +229,7 @@ LUA_API void  lua_newuserdatabox (lua_State *L, void *u);
 #define lua_isnil(L,n)		(lua_type(L,n) == LUA_TNIL)
 #define lua_isboolean(L,n)	(lua_type(L,n) == LUA_TBOOLEAN)
 #define lua_isnone(L,n)		(lua_type(L,n) == LUA_TNONE)
+#define lua_isnoneornil(L, n)	(lua_type(L,n) <= 0)
 
 #define lua_pushliteral(L, s)	lua_pushlstring(L, "" s, \
                                                 (sizeof(s)/sizeof(char))-1)