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|
#!/bin/bash -i
set -m
[ "${BASH_LOADABLES_PATH:=/lib/bash:/usr/lib/bash}" ]
cfmakeraw()
{
cmd=(stty -ignbrk -brkint -parmrk -istrip -inlcr -igncr -icrnl
-ixon -opost -echo -echonl -icanon -isig -iexten -parenb cs8)
"${cmd[@]}" "$@" >/dev/null
}
readchar_reset()
{
:
}
i()
{
if [ "$DEBUG" ]
then
printf 'I: %s\n' "$*" >&2
fi
}
x()
{
if [ "$DEBUG" ]
then
printf '+ %s\n' "${*@Q}" >&2
fi
"$@"
}
readchar_init()
{
[ $$ != $BASHPID ] || return
declare -g SOCAT= SOCAT_PID=
declare -g t
declare -g -a readchar_termopts
[ -t 1 ] && t=y || t=
readchar_termopts=(
opost onlcr isig
intr undef
quit undef
)
trap "i CONT; readchar_SIGCONT" CONT
for sig in TSTP TTIN TTOU
do
trap "i $sig; x kill -STOP \$BASHPID \$SOCAT_PID" $sig
done
}
DEBUG=y
readchar_SIGCONT()
{
if check_foreground
then
if [ -t 0 ]
then
cfmakeraw "${readchar_termopts[@]}"
fi
x kill -CONT $SOCAT_PID 2>/dev/null
else
x kill -STOP $BASHPID $SOCAT_PID 2>/dev/null
fi
}
check_foreground()
{
read _pid _comm _state _ppid pgrp _session _tty_nr tpgid _rest < /proc/self/stat
[ "$tpgid" = "$pgrp" ]
}
readchar()
{
declare -n REPLY="${1:-CHARACTER}"
if [ -t 0 ]
then
if check_foreground
then
if ! [ "$SOCAT_PID" ]
then
cfmakeraw "${readchar_termopts[@]}"
fi
else
sleep .25
return
fi
fi
if ! [ "$SOCAT_PID" ]
then
exec {SOCAT}< <(trap 'sleep .25' SIGTSTP; socat - -)
SOCAT_PID=$!
fi
if read -n 1 -d '' -r -s -u "$SOCAT"
then
if [ "$t" ]
then
printf -v quoted_reply "%s" "${REPLY@Q}"
if (( (count += 1 + ${#quoted_reply}) < COLUMNS - 10 ))
then
seperate=' '
else
seperate=$'\n'
count=0
fi
printf "%s" "$seperate" "$quoted_reply"
else
if [ "$REPLY" ]
then
printf "%s" "$REPLY"
else
printf "\0"
fi
fi
else
[ $? -gt 128 ]
fi
}
read_char()
{
readchar_init
t=
c=
count=0
while ! [ "$c" ]
do
readchar c
done
readchar_reset
if [ -t 1 ]
then
printf '%s\n' "${c@Q}"
else
printf %s "$c"
fi
}
read_chars()
{
readchar_init
while readchar
do
continue
done
readchar_reset
}
reader_process()
{
enable -f sleep sleep
if [ "$SHLVL" = 1 -a -t 1 ]
then
(read_chars)
else
read_chars
fi
}
run_test()
{
reader_process &
kill -TSTP %reader_process
bg %reader_process
kill -TSTP %reader_process
bg %reader_process
kill -TSTP %reader_process
bg %reader_process
kill -TSTP %reader_process
bg %reader_process
kill -TSTP %reader_process
fg %reader_process
}
|
