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src/compat.c: provide luaL_testudata() for use by auxiliar.c under Lua 5.1

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This commit is contained in:
E. Westbrook 2018-06-04 20:14:13 -06:00
parent e1e41be948
commit 5848de4851
2 changed files with 19 additions and 0 deletions
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18
src/compat.c
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@ -16,4 +16,22 @@ void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
}
lua_pop(L, nup); /* remove upvalues */
}
/*
** Duplicated from Lua 5.2
*/
void *luaL_testudata (lua_State *L, int ud, const char *tname) {
void *p = lua_touserdata(L, ud);
if (p != NULL) { /* value is a userdata? */
if (lua_getmetatable(L, ud)) { /* does it have a metatable? */
luaL_getmetatable(L, tname); /* get correct metatable */
if (!lua_rawequal(L, -1, -2)) /* not the same? */
p = NULL; /* value is a userdata with wrong metatable */
lua_pop(L, 2); /* remove both metatables */
return p;
}
}
return NULL; /* value is not a userdata with a metatable */
}
#endif

1
src/compat.h
View File

@ -6,6 +6,7 @@
#if LUA_VERSION_NUM==501
void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup);
void *luaL_testudata ( lua_State *L, int arg, const char *tname);
#endif
#endif