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Lhf wrote...

 > void luaL_verror (char *fmt, ...)
 > {
 >   char buff[500];
 >   va_list argp;
 >   va_start(argp, fmt);
 >   vsprintf(buff, fmt, argp);
 >   va_end(argp);
 >   lua_error(buff);
 > }
 > Unfortunately, until the new ANSI C is out, there is no way to avoid the
 > fixed size buffer and the danger for overflow in vsprintf.

And in my followup I forgot to mention that a solution to this problem
already exists in Lua: it is called `format', and it takes care of
allocating a buffer of the correct size.  It just needs to be exposed
in the C API.