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#!/usr/bin/env jimsh
# tip.tcl is like a simple version of cu, written in pure Jim Tcl
# It makes use of the new aio tty support
# Note: On Mac OS X, be sure to open /dev/cu.* devices, not /dev/tty.* devices
set USAGE \
{Usage: tip ?settings? device
or tip help
Where settings are as follows:
1|2 stop bits (default 1)
5|6|7|8 data bits (default 8)
even|odd parity (default none)
xonxoff|rtscts handshaking (default none)
<number> baud rate (default 115200)
e.g. tip 9600 8 1 rtscts /dev/ttyUSB0}
set settings {
baud 115200
stop 1
data 8
parity none
handshake none
input raw
output raw
vmin 1
vtime 1
}
set showhelp 0
foreach i $argv {
if {[string match -h* $i] || [string match help* $i]} {
puts $USAGE
return 0
}
if {$i in {even odd}} {
set settings(parity) $i
continue
}
if {$i in {ixonixoff rtscts}} {
set settings(handshake) $i
continue
}
if {$i in {1 2}} {
set settings(stop) $i
continue
}
if {$i in {5 6 7 8}} {
set settings(data) $i
continue
}
if {[string is integer -strict $i]} {
set settings(baud) $i
continue
}
if {[file exists $i]} {
set device $i
continue
}
puts "Warning: unrecognised setting $i"
}
if {![exists device]} {
puts $USAGE
exit 1
}
# save stdin and stdout tty settings
# note that stdin and stdout are probably the same file descriptor,
# but it doesn't hurt to treat them independently
set stdin_save [stdin tty]
set stdout_save [stdout tty]
try {
set f [open $device r+]
} on error msg {
puts "Failed to open $device"
return 1
}
if {[$f lock] == 0} {
puts "Device is in use: $device"
return 1
}
try {
$f tty {*}$settings
} on error msg {
puts "$device: $msg"
return 1
}
puts "\[$device\] Use ~. to exit"
$f ndelay 1
$f buffering none
stdin tty input raw
stdin ndelay 1
stdout tty output raw
stdout buffering none
set status ""
set tilde 0
set tosend {}
# To avoid sending too much data and blocking,
# this sends str in chunks of 1000 bytes via writable
proc output-on-writable {fh str} {
# Add it to the buffer to send
append ::tosend($fh) $str
if {[string length [$fh writable]] == 0} {
# Start the writable event handler
$fh writable [list output-is-writable $fh]
}
}
# This is the writable callback
proc output-is-writable {fh} {
global tosend
set buf $tosend($fh)
if {[string bytelength $buf] >= 1000} {
set tosend($fh) [string byterange $buf 1000 end]
set buf [string byterange $buf 0 999]
} else {
set tosend($fh) {}
# All sent, so cancel the writable event handler
$fh writable {}
}
$fh puts -nonewline $buf
}
proc bgerror {args} {
set status $args
incr ::done
}
# I/O loop
$f readable {
set c [$f read]
if {[$f eof]} {
set status "$device: disconnected"
incr done
break
}
output-on-writable stdout $c
}
proc tilde_timeout {} {
global tilde f
if {$tilde} {
output-on-writable $f ~
set tilde 0
}
}
stdin readable {
set c [stdin read]
# may receive more than one char here, but only need to consider
# ~. processing if we receive them as separate chars
if {$tilde == 0 && $c eq "~"} {
incr tilde
# Need ~. within 1 second of each other
after 1000 tilde_timeout
} else {
if {$tilde} {
after cancel tilde_timeout
set tilde 0
if {$c eq "."} {
incr done
return
}
output-on-writable $f ~
}
output-on-writable $f $c
}
}
vwait done
# restore previous settings
stdin tty {*}$stdin_save
stdout tty {*}$stdout_save
puts $status
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