commit 2fef8c772b5d9c175941d4c8a64dedf736567466
parent 7285fa393ba4ef62e33f490cd23fc8aba2b7b6a4
Author: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Tue, 11 Feb 2003 13:32:09 -0200
auxiliary function to check userdata with types
Diffstat:
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/lauxlib.c b/lauxlib.c
@@ -1,5 +1,5 @@
/*
-** $Id: lauxlib.c,v 1.93 2003/01/27 13:46:16 roberto Exp roberto $
+** $Id: lauxlib.c,v 1.94 2003/02/11 09:44:38 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
@@ -121,6 +121,19 @@ LUALIB_API void luaL_checkany (lua_State *L, int narg) {
}
+LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
+ if (!lua_getmetatable(L, ud)) return NULL; /* no metatable? */
+ lua_pushstring(L, tname);
+ lua_rawget(L, LUA_REGISTRYINDEX);
+ if (!lua_rawequal(L, -1, -2)) {
+ lua_pop(L, 2);
+ return NULL;
+ }
+ lua_pop(L, 2);
+ return lua_touserdata(L, ud);
+}
+
+
LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {
const char *s = lua_tostring(L, narg);
if (!s) tag_error(L, narg, LUA_TSTRING);
diff --git a/lauxlib.h b/lauxlib.h
@@ -1,5 +1,5 @@
/*
-** $Id: lauxlib.h,v 1.56 2003/01/17 15:28:09 roberto Exp roberto $
+** $Id: lauxlib.h,v 1.57 2003/01/27 13:46:16 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
@@ -33,6 +33,7 @@ LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *e);
LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *e);
LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname);
LUALIB_API int luaL_argerror (lua_State *L, int numarg, const char *extramsg);
+LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname);
LUALIB_API const char *luaL_checklstring (lua_State *L, int numArg, size_t *l);
LUALIB_API const char *luaL_optlstring (lua_State *L, int numArg,
const char *def, size_t *l);