ffi: move socket stuff to socket module.

* alloca.h (zalloca): Macro moved here from ffi.c; it's useful
to any code that wants to do a zero-filled alloca, and
socket.c needs it now.

* ffi.c (HAVE_SOCKETS): All includes conditional on HAVE_SOCKETS
removed.
(zalloca): Macro removed; moved to alloca.h.
(ffi_type_struct_checked, ffi_type_lookup): Static functions
changed to external linkage.
(ffi_type_size, ffi_type_put, ffi_type_get): New functions,
used by external module that has incomplete definition of
struct txr_ffi_type.
(type_by_size): New static array, moved out of
ffi_init_extra_types function.
(ffi_type_by_size): New function.
(ffi_init_extra_types): type_by_size array relocated to
file scope.
(sock_opt, sock_set_opt): Moved to socket.c, and adjusted to
use newly developed external access to needed ffi mechanisms.
(ffi_init): Numerous definitions related to sockets removed;
these go to socket.c.

* ffi.h (struct txr_ffi_type): Declared here now as
incomplete type.
(ffi_type_struct_checked, ffi_type_size, ffi_type_put,
ffi_type_get, ffi_type_lookup, ffi_type_by_size): Declared.

* lib.c (init): Call new function sock_init.

* socket.c (sock_opt, sock_set_opt): New functions, moved
from ffi.c, and slightly adapted to work with external
interfaces exposed by ffi.c.
(sock_init): New function. This performs unconditional
initializations not keyed to the lazy loading lisplib.c
mechanism. Here we create the socklen-t FFI type.
FFI types lookup doesn't trigger lazy loading, so we do it
this way; the alternative would be to introduce lazy load
triggering to FFI type lookup, just for this one type.
(sock_load_init): All the socket function and variable
registrations move here from ffi_init.

1 files changed, 2 insertions, 0 deletions

diff --git a/alloca.h b/alloca.h
index b922c8fe..fd38f81f 100644
--- a/alloca.h
+++ b/alloca.h
@@ -37,3 +37,5 @@
 #error portme
 #endif
 #endif
+
+#define zalloca(size) memset(alloca(size), 0, size)