Re: Lua without stdio?

[Enrico Colombini <erix@...>]

David Given wrote:
> Does anyone have a patch to remove stdio support from Lua 5.1?
>
> It's something I can certainly do myself, but a quick look shows that
> it's surprisingly complicated, so I thought I'd ask first before getting
> started.

Having to integrate Lua into an embedded system with an incomplete and 
broken stdio, I couldn't just redefine stdio functions (they would have 
conflicted with existing ones).
Sorry, no patch. But, in case it may be useful, this is what I did 
according to my notes (approx. line numbers refer to Lua 5.1.2).
I also didn't use iolib, loadlib, oslib, where most of the references to 
stdio are; furthermore, I removed file loading and reimplemented it 
externally using luaL_loadbuffer. So I guess this will not be of great 
help to you, but just in case...

lvm.c
- changed strcoll to strcmp (~207) [not really stdio-related]

lbaselib.c:
- changed fputs to <proprietary_function> in luaB_print (~30)
- removed luaB_loadfile (~285 and table ~455)
- removed luaB_dofile (~327 and table ~454)

lauxlib.c:
- removed LoadF, getF, errfile, luaL_loadfile (~522)
- changed fprintf to <proprietary_function> in panic (~646)

---

To Roberto and Luiz: it would be great (for us embedded users) to 
someday have stdio (and strcoll) fully decoupled from Lua sources, e.g. 
by using macros in luaconf.h for all the relevant functions, or by 
adding a stdio_funcs.c file.
At least for baselib and auxlib (see above), so we wouldn't have to 
re-patch at every new release.

That's just a suggestion, anyway: I'd like to stress that I'm _very_ 
happy with Lua... and with the support I received here :-)

  Enrico