file loading callbacks, overriding "fopen"

["Peter Pimley" <Peter.Pimley@...>]

Hello Lua list,

Here's my second "always wanted to do" question:

I work on platforms (games consoles) where 'fopen' and friends don't
really have any meaning and are never called.  Other than that, the
platforms behave in a reasonably normal fashion.

My C application loads (using nonstandard proprietary functions) all the
scripts it is going to need as soon as it starts, and stores them as
"const char *" values in a big lookup table.  The table is indexed by
filename.  When the time comes to actually execute one of them, it is
passed to the lua_State using luaL_dostring.  So far, so good.

But I cannot figure out how to set up callbacks so that either "require"
or "dofile" work.

The perfect situation for me would be to supply the lua_State with a C
function that takes a filename and returns the loaded data.

Whenever I've had this problem in the past, I've usually registered my
own function that does essentially that, and told people writing scripts
to use that function instead of "require".  Or sometimes I just make a
rule of always running a certain file before any others.

Is there a better way of doing this?  I realise I could change lua's
source code, but I'd rather play within the existing rules.

Thanks again for the help,  (I see my previous question already has four
answers!)

Peter Pimley





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