On 04/24/2010 12:45 AM, Eric Blake wrote:
For platforms without stdio hooking, the simplest thing we could think
of is to create a temporary file under the hood, then provide gnulib
overrides of fflush and fclose (the only two points at which POSIX
requires that the original arguments to open_memstream are in sync
with what has happened to the stream). Those hooks would then dump
the current contents of the temp file into malloc'd memory. So it is
I/O intensive, but seems feasible to implement. Other alternatives we
considered were using mmap of a temporary file, and doing a gnulib
override of malloc/realloc to recognize the mmap pointer, which is
less I/O intensive but still requires the disk; but that runs into
mmap difficulties (and makes mingw porting harder). We also
considered hooking every single function that takes a FILE* to
understand string streams, but that was ruled out as too invasive to
be practical.
We're at the point where every other function in mingw is being hooked.
Maybe it would be better to start fresh with ReactOS's msvcrt, add
everything that gnulib provides and more (for example the *at functions
could be added very easily), and link it statically with the application
instead of using gnulib... kind of like the mingwex library but to the
n-th power...
Paolo
