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Turn Backend into a sensible classoid.

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Nearly every part of the code that ever handles a full backend
structure has historically done it using a pair of pointer variables,
one pointing at a constant struct full of function pointers, and the
other pointing to a 'void *' state object that's passed to each of
those.

While I'm modernising the rest of the code, this seems like a good
time to turn that into the same more or less type-safe and less
cumbersome system as I'm using for other parts of the code, such as
Socket, Plug, BinaryPacketProtocol and so forth: the Backend structure
contains a vtable pointer, and a system of macro wrappers handles
dispatching through that vtable.
This commit is contained in:
Simon Tatham
2018-09-11 16:23:38 +01:00
parent c51fe7c217
commit eefebaaa9e
36 changed files with 633 additions and 611 deletions
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2
windows/wincfg.c
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@ -393,7 +393,7 @@ void win_setup_config_box(struct controlbox *b, HWND *hwndp, int has_help,
* $XAUTHORITY is not reliable on Windows, so we provide a
* means to override it.
*/
if (!midsession && backend_from_proto(PROT_SSH)) {
if (!midsession && backend_vt_from_proto(PROT_SSH)) {
s = ctrl_getset(b, "Connection/SSH/X11", "x11", "X11 forwarding");
ctrl_filesel(s, "X authority file for local display", 't',
NULL, FALSE, "Select X authority file",