Re: luajit string to char * conversion
- From: Florian Weimer <fw@xxxxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Wed, 19 Nov 2014 20:49:50 +0100
* marcelo nicolet:
> This answer was right: -Wl, -E did the trick.
>
> Now, being the function create_thread( char * ), and calling it as
> C.create_thread( lua_string ) it gives
>
> ./mainthread: second.lua:33: bad argument #1 to 'create_thread' (cannot
> convert
> 'string' to 'char *')
>
> What can I do? How can I convert the lua string to char*
You need to call strdup (and free the pointer somewhere) if the
create_thread function indeed modifies the argument string.
Otherwise, it is sufficient to change the type of the argument to
“const char *” (both in the Lua declaration and the C implementation).
Lua strings must not be modified, and the C type system enforces this
for once.
(ffi.cast is the wrong way to tackle this.)
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