FMSLogo Code

Fix Bug #182; NETACCEPTON can now accept multiple connections (in serial)

The heart of the fix is to keep two distinct sockets for server connections, the listen socket and the connection (accept) socket. Before, the code only kept one socket and the listen socket was overwritten by the connection socket when accept() was called. By keeping track of the two sockets separately, NETACCEPTOFF can reliably cancel the listen(), which makes it possible to re-listen on the same port later.

An ancilliary change is to close the connection socket when the client initiates a half-close. This was required to not leak the connection socket by overwriting it when a new accept() call was made.

The logic still only supports one concurrent connection to the server, so multiple connections must be made in serial.

Retroactively tag the source code used to generate the 1.10 release.

Update the ZIP-building target to be compatible with Subversion instead of CVS.

There are no longer any CSV directories to avoid, but the Makefile also can no longer assume the directory is named "extras".

Initial commit of a proof-of-concept HTTP Server

FMSLogo 8.0.0 includes some bug fixes to the networking API which makes it just barely possible to implement a compatible but non-conforming HTTP server (as long as clients don't try to create two concurrent connections). An HTTP server written in FMSLogo may be interesting to others, since it provides the ability to interoperate with the modern computing world.

Refactoring: Rename the callback/message for WSAAsyncSelect to improve clarity
WM_NETWORK_CONNECTSENDACK -> WM_NETWORK_CLIENTSOCKETEVENT
WM_NETWORK_LISTENRECEIVEACK -> WM_NETWORK_SERVERSOCKETEVENT
OnConnectSendAck -> OnClientSocketEvent
OnListenReceiveAck -> OnServerSocketEvent

Cleanup: Remove unused symbol WM_MYSCROLLBARCALLBACK
As far as I can tell, this was never used, even when FMSLogo was forked from MSWLogo

Refactoring: Rename DNS callback for clarity:
WM_NETWORK_CONNECTSENDFINISH -> WM_NETWORK_ONHAVEREMOTEHOSTADDRESS
OnConnectSendAck -> OnHaveRemoteHostAddress

Fix a test bug that prevented the network tests from running on windows 10
Perl's recv() can return the empty string on success, so the return value checking had to be adjusted to only consider the undefined value to be an error.

Fix Bug #186; NETACCEPTON and NETCONNECTON no longer run the :sendready instruction list when the remote host initiates a half-close.

Refactor networking recv to remove a copy

The main part of this change is to read data from the network directly into the "carry over buffer" instead of reading it onto a stack variable and copying it to that buffer.

It also includes a change that makes partial frames available to FMSLogo programs sooner. This makes it easier to implement an HTTP server, since HTTP clients typically don't send requests with a NUL framing byte nor do they close the socket until after they hear back from the server.

Finally, it includes a comment as to why partial frames are make available so that I don't unwittingly remove this functionality in the future (as I came close to doing in this change).