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Fish 'n' More 2
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fishmore-publicdomainlibraryvol.ii1991xetec.iso
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telecom
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vlt_455
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intercept.vlt
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1991-02-12
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/** Intercept.vlt
*
* Example program to intercept keystrokes.
* Changes lower case b's into upper case C's, until you type a lower case a.
*
**/
/*
* Open a port
*/
mp = openport(FOOBAR)
"message (Now type some lower case b's and other stuff.*NType a lower case a to get out.)"
/*
* Tell VLT to send us stuff
*/
"wedge keystrokes FOOBAR"
/*
* Loop until quitflag is 1, waiting for packets
*/
do forever
if quitflag = 1 then leave
t = waitpkt(FOOBAR)
/*
* We got a number of packets. Loop over all of them.
*/
do ff = 1
p = getpkt(FOOBAR)
if c2d(p) = 0 then leave ff
line = getarg(p)
/*
* Got a line. It is of the form: KEYSTROKE code qualifier iaddress character
* parse it out.
*/
parse var line command code qual iaddr char .
/*
* If we got an "a", quit. If a "b", say that we'll handle this one
* ourselves by replying a 0 error return and replace it with a capital C!
* Otherwise return a 1.
*/
if char = 'a' then quitflag = 1
if char = 'b' then do
t = reply(p, 0)
if (char = 'b') then address VLT "send (C); emit (C);"
end
else t = reply(p, 1)
end
end