lua_gettable and similars return type of gotten value

lapi.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.c,v 2.199 2014/02/25 14:30:21 roberto Exp roberto $
+** $Id: lapi.c,v 2.200 2014/02/26 12:39:30 roberto Exp roberto $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
@@ -628,7 +628,7 @@ LUA_API int lua_pushthread (lua_State *L) {
 */
 
 
-LUA_API void lua_getglobal (lua_State *L, const char *var) {
+LUA_API int lua_getglobal (lua_State *L, const char *var) {
   Table *reg = hvalue(&G(L)->l_registry);
   const TValue *gt;  /* global table */
   lua_lock(L);
@@ -636,19 +636,21 @@ LUA_API void lua_getglobal (lua_State *L, const char *var) {
   setsvalue2s(L, L->top++, luaS_new(L, var));
   luaV_gettable(L, gt, L->top - 1, L->top - 1);
   lua_unlock(L);
+  return ttnov(L->top - 1);
 }
 
 
-LUA_API void lua_gettable (lua_State *L, int idx) {
+LUA_API int lua_gettable (lua_State *L, int idx) {
   StkId t;
   lua_lock(L);
   t = index2addr(L, idx);
   luaV_gettable(L, t, L->top - 1, L->top - 1);
   lua_unlock(L);
+  return ttnov(L->top - 1);
 }
 
 
-LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
+LUA_API int lua_getfield (lua_State *L, int idx, const char *k) {
   StkId t;
   lua_lock(L);
   t = index2addr(L, idx);
@@ -656,20 +658,22 @@ LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
   api_incr_top(L);
   luaV_gettable(L, t, L->top - 1, L->top - 1);
   lua_unlock(L);
+  return ttnov(L->top - 1);
 }
 
 
-LUA_API void lua_rawget (lua_State *L, int idx) {
+LUA_API int lua_rawget (lua_State *L, int idx) {
   StkId t;
   lua_lock(L);
   t = index2addr(L, idx);
   api_check(L, ttistable(t), "table expected");
   setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
   lua_unlock(L);
+  return ttnov(L->top - 1);
 }
 
 
-LUA_API void lua_rawgeti (lua_State *L, int idx, lua_Integer n) {
+LUA_API int lua_rawgeti (lua_State *L, int idx, lua_Integer n) {
   StkId t;
   lua_lock(L);
   t = index2addr(L, idx);
@@ -677,10 +681,11 @@ LUA_API void lua_rawgeti (lua_State *L, int idx, lua_Integer n) {
   setobj2s(L, L->top, luaH_getint(hvalue(t), n));
   api_incr_top(L);
   lua_unlock(L);
+  return ttnov(L->top - 1);
 }
 
 
-LUA_API void lua_rawgetp (lua_State *L, int idx, const void *p) {
+LUA_API int lua_rawgetp (lua_State *L, int idx, const void *p) {
   StkId t;
   TValue k;
   lua_lock(L);
@@ -690,6 +695,7 @@ LUA_API void lua_rawgetp (lua_State *L, int idx, const void *p) {
   setobj2s(L, L->top, luaH_get(hvalue(t), &k));
   api_incr_top(L);
   lua_unlock(L);
+  return ttnov(L->top - 1);
 }
 
 

lauxlib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.c,v 1.258 2014/02/11 17:39:15 roberto Exp roberto $
+** $Id: lauxlib.c,v 1.259 2014/02/19 13:48:53 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -172,8 +172,7 @@ static int typeerror (lua_State *L, int arg, const char *tname) {
   const char *msg;
   const char *typearg = luaL_typename(L, arg);
   if (lua_getmetatable(L, arg)) {
-    lua_getfield(L, -1, "__name");
+    if (lua_getfield(L, -1, "__name") == LUA_TSTRING)
-    if (lua_isstring(L, -1))
       typearg = lua_tostring(L, -1);
   }
   else if (lua_type(L, arg) == LUA_TLIGHTUSERDATA)
@@ -719,8 +718,7 @@ LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
   if (!lua_getmetatable(L, obj))  /* no metatable? */
     return 0;
   lua_pushstring(L, event);
-  lua_rawget(L, -2);
+  if (lua_rawget(L, -2) == LUA_TNIL) {  /* is metafield nil? */
-  if (lua_isnil(L, -1)) {
     lua_pop(L, 2);  /* remove metatable and metafield */
     return 0;
   }
@@ -802,8 +800,7 @@ static const char *luaL_findtable (lua_State *L, int idx,
     e = strchr(fname, '.');
     if (e == NULL) e = fname + strlen(fname);
     lua_pushlstring(L, fname, e - fname);
-    lua_rawget(L, -2);
+    if (lua_rawget(L, -2) == LUA_TNIL) {  /* no such field? */
-    if (lua_isnil(L, -1)) {  /* no such field? */
       lua_pop(L, 1);  /* remove this nil */
       lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */
       lua_pushlstring(L, fname, e - fname);
@@ -840,8 +837,7 @@ static int libsize (const luaL_Reg *l) {
 LUALIB_API void luaL_pushmodule (lua_State *L, const char *modname,
                                  int sizehint) {
   luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);  /* get _LOADED table */
-  lua_getfield(L, -1, modname);  /* get _LOADED[modname] */
+  if (lua_getfield(L, -1, modname) != LUA_TTABLE) {  /* no _LOADED[modname]? */
-  if (!lua_istable(L, -1)) {  /* not found? */
     lua_pop(L, 1);  /* remove previous result */
     /* try global variable (and create one if it does not exist) */
     lua_pushglobaltable(L);
@@ -893,8 +889,8 @@ LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
 ** into the stack
 */
 LUALIB_API int luaL_getsubtable (lua_State *L, int idx, const char *fname) {
-  lua_getfield(L, idx, fname);
+  if (lua_getfield(L, idx, fname) == LUA_TTABLE)
-  if (lua_istable(L, -1)) return 1;  /* table already there */
+    return 1;  /* table already there */
   else {
     lua_pop(L, 1);  /* remove previous result */
     idx = lua_absindex(L, idx);

lbaselib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lbaselib.c,v 1.283 2014/02/13 12:11:34 roberto Exp roberto $
+** $Id: lbaselib.c,v 1.284 2014/02/14 16:45:38 roberto Exp roberto $
 ** Basic library
 ** See Copyright Notice in lua.h
 */
@@ -246,8 +246,7 @@ static int ipairsaux (lua_State *L) {
   luaL_checktype(L, 1, LUA_TTABLE);
   i++;  /* next value */
   lua_pushinteger(L, i);
-  lua_rawgeti(L, 1, i);
+  return (lua_rawgeti(L, 1, i) == LUA_TNIL) ? 1 : 2;
-  return (lua_isnil(L, -1)) ? 1 : 2;
 }
 
 

ldblib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: ldblib.c,v 1.135 2013/07/22 16:05:53 roberto Exp roberto $
+** $Id: ldblib.c,v 1.136 2014/02/19 13:51:09 roberto Exp roberto $
 ** Interface from Lua to its debug API
 ** See Copyright Notice in lua.h
 */
@@ -270,8 +270,7 @@ static void hookf (lua_State *L, lua_Debug *ar) {
     {"call", "return", "line", "count", "tail call"};
   gethooktable(L);
   lua_pushthread(L);
-  lua_rawget(L, -2);
+  if (lua_rawget(L, -2) == LUA_TFUNCTION) {
-  if (lua_isfunction(L, -1)) {
     lua_pushstring(L, hooknames[(int)ar->event]);
     if (ar->currentline >= 0)
       lua_pushinteger(L, ar->currentline);

loadlib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: loadlib.c,v 1.111 2012/05/30 12:33:44 roberto Exp roberto $
+** $Id: loadlib.c,v 1.112 2013/10/07 14:20:31 roberto Exp roberto $
 ** Dynamic library loader for Lua
 ** See Copyright Notice in lua.h
 **
@@ -468,8 +468,7 @@ static int searcher_Croot (lua_State *L) {
 static int searcher_preload (lua_State *L) {
   const char *name = luaL_checkstring(L, 1);
   lua_getfield(L, LUA_REGISTRYINDEX, "_PRELOAD");
-  lua_getfield(L, -1, name);
+  if (lua_getfield(L, -1, name) == LUA_TNIL)  /* not found? */
-  if (lua_isnil(L, -1))  /* not found? */
     lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
   return 1;
 }
@@ -484,8 +483,7 @@ static void findloader (lua_State *L, const char *name) {
     luaL_error(L, LUA_QL("package.searchers") " must be a table");
   /*  iterate over available searchers to find a loader */
   for (i = 1; ; i++) {
-    lua_rawgeti(L, 3, i);  /* get a searcher */
+    if (lua_rawgeti(L, 3, i) == LUA_TNIL) {  /* no more searchers? */
-    if (lua_isnil(L, -1)) {  /* no more searchers? */
       lua_pop(L, 1);  /* remove nil */
       luaL_pushresult(&msg);  /* create error message */
       luaL_error(L, "module " LUA_QS " not found:%s",
@@ -520,8 +518,7 @@ static int ll_require (lua_State *L) {
   lua_call(L, 2, 1);  /* run loader to load module */
   if (!lua_isnil(L, -1))  /* non-nil return? */
     lua_setfield(L, 2, name);  /* _LOADED[name] = returned value */
-  lua_getfield(L, 2, name);
+  if (lua_getfield(L, 2, name) == LUA_TNIL) {   /* module set no value? */
-  if (lua_isnil(L, -1)) {   /* module did not set a value? */
     lua_pushboolean(L, 1);  /* use true as result */
     lua_pushvalue(L, -1);  /* extra copy to be returned */
     lua_setfield(L, 2, name);  /* _LOADED[name] = true */
@@ -587,9 +584,8 @@ static int ll_module (lua_State *L) {
   int lastarg = lua_gettop(L);  /* last parameter */
   luaL_pushmodule(L, modname, 1);  /* get/create module table */
   /* check whether table already has a _NAME field */
-  lua_getfield(L, -1, "_NAME");
+  if (lua_getfield(L, -1, "_NAME") != LUA_TNIL)
-  if (!lua_isnil(L, -1))  /* is table an initialized module? */
+    lua_pop(L, 1);  /* table is an initialized module */
-    lua_pop(L, 1);
   else {  /* no; initialize it */
     lua_pop(L, 1);
     modinit(L, modname);

loslib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: loslib.c,v 1.42 2014/02/26 15:27:56 roberto Exp roberto $
+** $Id: loslib.c,v 1.43 2014/02/26 15:55:58 roberto Exp roberto $
 ** Standard Operating System library
 ** See Copyright Notice in lua.h
 */
@@ -158,8 +158,7 @@ static void setboolfield (lua_State *L, const char *key, int value) {
 
 static int getboolfield (lua_State *L, const char *key) {
   int res;
-  lua_getfield(L, -1, key);
+  res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1);
-  res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
   lua_pop(L, 1);
   return res;
 }

lua.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lua.h,v 1.299 2014/02/13 12:11:34 roberto Exp roberto $
+** $Id: lua.h,v 1.300 2014/02/25 14:30:21 roberto Exp roberto $
 ** Lua - A Scripting Language
 ** Lua.org, PUC-Rio, Brazil (http://www.lua.org)
 ** See Copyright Notice at the end of this file
@@ -228,12 +228,13 @@ LUA_API int   (lua_pushthread) (lua_State *L);
 /*
 ** get functions (Lua -> stack)
 */
-LUA_API void  (lua_getglobal) (lua_State *L, const char *var);
+LUA_API int (lua_getglobal) (lua_State *L, const char *var);
-LUA_API void  (lua_gettable) (lua_State *L, int idx);
+LUA_API int (lua_gettable) (lua_State *L, int idx);
-LUA_API void  (lua_getfield) (lua_State *L, int idx, const char *k);
+LUA_API int (lua_getfield) (lua_State *L, int idx, const char *k);
-LUA_API void  (lua_rawget) (lua_State *L, int idx);
+LUA_API int (lua_rawget) (lua_State *L, int idx);
-LUA_API void  (lua_rawgeti) (lua_State *L, int idx, lua_Integer n);
+LUA_API int (lua_rawgeti) (lua_State *L, int idx, lua_Integer n);
-LUA_API void  (lua_rawgetp) (lua_State *L, int idx, const void *p);
+LUA_API int (lua_rawgetp) (lua_State *L, int idx, const void *p);
+
 LUA_API void  (lua_createtable) (lua_State *L, int narr, int nrec);
 LUA_API void *(lua_newuserdata) (lua_State *L, size_t sz);
 LUA_API int   (lua_getmetatable) (lua_State *L, int objindex);