Hello Roland,
stdin is a terminal, you must set echo off (stty -echo).
I made few changes to deal with end of line and to be able to test it.
Because you are reading caracters one by one, you are in a raw mode.
So you must deal with end-of-file.
And ... I hard-code Ctrl-D as EOF.
I can get eof from stty, like :
eof=$(stty -a | sed -n 's/eof = \([^;]*\);.*/\1/p')
But after, I need to change ^D to $'\cd' and I don't know how to do it!!
Regards,
Yves
-- snip --
#!/bin/ksh
set -u
# line buffer class
# The buffer class tries to read characters from the given <fd> until
# it has read a whole line.
typeset -T linebuf_t=(
typeset buf
function reset
{
_.buf=''
return 0
}
function readbuf
{
nameref var=$1
integer fd=$2
typeset ch
while read -u $fd -N 1 ch ; do
if [[ $ch == +($'\n'|$'\r'|$'\cd') ]]; then
var=${_.buf}
_.reset
[[ $var == '' ]] && return 1
return 0
fi
_.buf+=$ch
done
return 1
}
)
integer infd
linebuf_t clientbuf
redirect {infd}< '/dev/stdin'
stty --fd=$infd -echo
trap 'stty --fd=$infd echo' EXIT
while clientbuf.readbuf line $infd ; do
printf $"client: %q\n" "$line"
printf '%s\n' "$line" >&$infd
done
# End Of File
-- snip --
yves crespin
On Wed, May 26, 2010 at 10:04 PM, Roland Mainz <[email protected]> wrote:
>
> Hi!
>
> ----
>
> Does anyone know why the example below echos the characters I type _twice_ ?
> -- snip --
> # line buffer class
> # The buffer class tries to read characters from the given <fd> until
> # it has read a whole line.
> typeset -T linebuf_t=(
> typeset buf
>
> function reset
> {
> _.buf=''
> return 0
> }
>
> function readbuf
> {
> nameref var=$1
> integer fd=$2
> typeset ch
>
> while IFS='' read -u${fd} -t 0.2 -N 1 ch ; do
> [[ "${ch}" == $'\r' ]] && continue
>
> if [[ "${ch}" == $'\n' ]] ; then
> var="${_.buf}"
> _.reset
> return 0
> fi
>
> _.buf+="$ch"
> done
>
> return 1
> }
> )
>
> redirect {infd}< '/dev/stdin'
> linebuf_t clientbuf
>
> for (( ;; )) ; do
> while clientbuf.readbuf line ${infd} ; do
> printf $"client: %q\n" "${line}"
> printf '%s\n' "${line}" >&${fd}
> done
> done
> -- snip --
>
> If I run this script and enter "FISH" I get:
> FFIISSHH
>
> Erm... why does this happen ?
>
> ----
>
> Bye,
> Roland
>
> --
> __ . . __
> (o.\ \/ /.o) [email protected]
> \__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer
> /O /==\ O\ TEL +49 641 3992797
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