Re: [ANN] Lua 5.2.0 (beta-rc2) now available
[
Date Prev][
Date Next][
Thread Prev][
Thread Next]
[
Date Index]
[
Thread Index]
- Subject: Re: [ANN] Lua 5.2.0 (beta-rc2) now available
- From: steve donovan <steve.j.donovan@...>
- Date: 2011年6月22日 10:40:59 +0200
On Wed, Jun 22, 2011 at 12:21 AM, Luiz Henrique de Figueiredo
<lhf@tecgraf.puc-rio.br> wrote:
> All feedback welcome. Thanks.
Just an observation about the folly of depending on undocumented internals.
Previously people could hijack the existing file objects by packing
their own FILE* in the LUA_FILEHANDLE userdata, which was just FILE**.
Now that userdata looks like this:
typedef struct LStream {
FILE *f; /* stream */
lua_CFunction closef; /* to close stream (NULL for closed streams) */
} LStream;
(LuaJIT uses something similar)
I mention this because I think there's a need for a standard way for
extensions to create Lua file objects, or even on level of a
'io.fdopen' function that would create a file object from an existing
file-like handle. One particular use case would be a Windows
extension wishing to provide a UTF-8 aware io.open, or to redefine
io.popen so it does not depend on the particular broken implementation
of the Windows CRT.
steve d.