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b4c8fd9d86
This is a new vtable-based abstraction which is passed to a backend in place of Frontend, and it implements only the subset of the Frontend functions needed by a backend. (Many other Frontend functions still exist, notably the wide range of things called by terminal.c providing platform-independent operations on the GUI terminal window.) The purpose of making it a vtable is that this opens up the possibility of creating a backend as an internal implementation detail of some other activity, by providing just that one backend with a custom Seat that implements the methods differently. For example, this refactoring should make it feasible to directly implement an SSH proxy type, aka the 'jump host' feature supported by OpenSSH, aka 'open a secondary SSH session in MAINCHAN_DIRECT_TCP mode, and then expose the main channel of that as the Socket for the primary connection'. (Which of course you can already do by spawning 'plink -nc' as a separate proxy process, but this would permit it in the _same_ process without anything getting confused.) I've centralised a full set of stub methods in misc.c for the new abstraction, which allows me to get rid of several annoying stubs in the previous code. Also, while I'm here, I've moved a lot of duplicated modalfatalbox() type functions from application main program files into wincons.c / uxcons.c, which I think saves duplication overall. (A minor visible effect is that the prefixes on those console-based fatal error messages will now be more consistent between applications.)
26 lines
572 B
C
26 lines
572 B
C
/*
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* ldisc.h: defines the Ldisc data structure used by ldisc.c and
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* ldiscucs.c. (Unfortunately it was necessary to split the ldisc
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* module in two, to avoid unnecessarily linking in the Unicode
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* stuff in tools that don't require it.)
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*/
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#ifndef PUTTY_LDISC_H
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#define PUTTY_LDISC_H
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struct Ldisc_tag {
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Terminal *term;
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Backend *backend;
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Seat *seat;
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/*
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* Values cached out of conf.
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*/
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int telnet_keyboard, telnet_newline, protocol, localecho, localedit;
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char *buf;
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int buflen, bufsiz, quotenext;
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};
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#endif /* PUTTY_LDISC_H */
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