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NFC: Backport luaL_testudata to Lua 5.1 (#3352) 

And move luaL_checkudata to it, as in 5.3.
This commit is contained in:
Nathaniel Wesley Filardo 2020-12-24 07:39:08 +00:00 committed by GitHub
parent 9c1f4aca5b
commit b1d318de62
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 12 additions and 7 deletions
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18
app/lua/lauxlib.c
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@ -285,21 +285,25 @@ LUALIB_API int luaL_rometatable (lua_State *L, const char* tname, const ROTable
return 1;
}
LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
LUALIB_API 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? */
lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get correct metatable */
if (lua_rawequal(L, -1, -2)) { /* does it have the correct mt? */
lua_pop(L, 2); /* remove both metatables */
return p;
}
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;
}
}
luaL_typerror(L, ud, tname); /* else error */
return NULL; /* to avoid warnings */
return NULL; /* value is not a userdata with a metatable */
}
LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
void *p = luaL_testudata(L, ud, tname);
if (p == NULL) luaL_typerror(L, ud, tname);
return p;
}
LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *mes) {
if (!lua_checkstack(L, space))

1
app/lua/lauxlib.h
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@ -66,6 +66,7 @@ LUALIB_API void (luaL_checkany) (lua_State *L, int narg);
LUALIB_API int (luaL_newmetatable) (lua_State *L, const char *tname);
LUALIB_API int (luaL_rometatable) (lua_State *L, const char* tname, const ROTable *p);
LUALIB_API void *(luaL_testudata) (lua_State *L, int ud, const char *tname);
LUALIB_API void *(luaL_checkudata) (lua_State *L, int ud, const char *tname);
LUALIB_API void (luaL_where) (lua_State *L, int lvl);