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/* VERSION 1 introduces plumbing
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2 increases SNARFSIZE from 4096 to 32000
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*/
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#define VERSION 2
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#define TBLOCKSIZE 512 /* largest piece of text sent to terminal */
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#define DATASIZE (UTFmax*TBLOCKSIZE+30) /* ... including protocol header stuff */
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#define SNARFSIZE 32000 /* maximum length of exchanged snarf buffer, must fit in 15 bits */
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/*
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* Messages originating at the terminal
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*/
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typedef enum Tmesg
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{
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Tversion, /* version */
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Tstartcmdfile, /* terminal just opened command frame */
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Tcheck, /* ask host to poke with Hcheck */
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Trequest, /* request data to fill a hole */
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Torigin, /* gimme an Horigin near here */
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Tstartfile, /* terminal just opened a file's frame */
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Tworkfile, /* set file to which commands apply */
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Ttype, /* add some characters, but terminal already knows */
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Tcut,
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Tpaste,
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Tsnarf,
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Tstartnewfile, /* terminal just opened a new frame */
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Twrite, /* write file */
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Tclose, /* terminal requests file close; check mod. status */
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Tlook, /* search for literal current text */
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Tsearch, /* search for last regular expression */
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Tsend, /* pretend he typed stuff */
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Tdclick, /* double click */
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Tstartsnarf, /* initiate snarf buffer exchange */
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Tsetsnarf, /* remember string in snarf buffer */
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Tack, /* acknowledge Hack */
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Texit, /* exit */
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Tplumb, /* send plumb message */
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TMAX,
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}Tmesg;
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/*
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* Messages originating at the host
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*/
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typedef enum Hmesg
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{
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Hversion, /* version */
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Hbindname, /* attach name[0] to text in terminal */
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Hcurrent, /* make named file the typing file */
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Hnewname, /* create "" name in menu */
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Hmovname, /* move file name in menu */
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Hgrow, /* insert space in rasp */
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Hcheck0, /* see below */
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Hcheck, /* ask terminal to check whether it needs more data */
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Hunlock, /* command is finished; user can do things */
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Hdata, /* store this data in previously allocated space */
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Horigin, /* set origin of file/frame in terminal */
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Hunlockfile, /* unlock file in terminal */
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Hsetdot, /* set dot in terminal */
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Hgrowdata, /* Hgrow + Hdata folded together */
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Hmoveto, /* scrolling, context search, etc. */
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Hclean, /* named file is now 'clean' */
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Hdirty, /* named file is now 'dirty' */
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Hcut, /* remove space from rasp */
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Hsetpat, /* set remembered regular expression */
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Hdelname, /* delete file name from menu */
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Hclose, /* close file and remove from menu */
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Hsetsnarf, /* remember string in snarf buffer */
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Hsnarflen, /* report length of implicit snarf */
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Hack, /* request acknowledgement */
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Hexit,
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Hplumb, /* return plumb message to terminal - version 1 */
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HMAX,
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}Hmesg;
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typedef struct Header{
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uchar type; /* one of the above */
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uchar count0; /* low bits of data size */
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uchar count1; /* high bits of data size */
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uchar data[1]; /* variable size */
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}Header;
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/*
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* File transfer protocol schematic, a la Holzmann
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* #define N 6
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*
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* chan h = [4] of { mtype };
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* chan t = [4] of { mtype };
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*
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* mtype = { Hgrow, Hdata,
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* Hcheck, Hcheck0,
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* Trequest, Tcheck,
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* };
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*
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* active proctype host()
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* { byte n;
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*
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* do
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* :: n < N -> n++; t!Hgrow
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* :: n == N -> n++; t!Hcheck0
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*
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* :: h?Trequest -> t!Hdata
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* :: h?Tcheck -> t!Hcheck
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* od
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* }
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*
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* active proctype term()
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* {
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* do
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* :: t?Hgrow -> h!Trequest
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* :: t?Hdata -> skip
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* :: t?Hcheck0 -> h!Tcheck
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* :: t?Hcheck ->
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* if
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* :: h!Trequest -> progress: h!Tcheck
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* :: break
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* fi
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* od;
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* printf("term exits\n")
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* }
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*
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* From: gerard@research.bell-labs.com
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* Date: Tue Jul 17 13:47:23 EDT 2001
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* To: rob@research.bell-labs.com
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*
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* spin -c (or -a) spec
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* pcc -DNP -o pan pan.c
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* pan -l
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*
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* proves that there are no non-progress cycles
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* (infinite executions *not* passing through
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* the statement marked with a label starting
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* with the prefix "progress")
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*
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*/
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