[email protected] wrote on 03/13/2013 20:16:32:
> Subject: Re: [ast-users] ksh93v- read bug
> --------
>
>
> > ksh93v- 2013-02-22 does not honor -r with -d ''.
> > Exemple:
> >
> > ## correct behaviour with delim='\n'
> > ## expected ouput is \ \n
> > $ printf '\\\n' | read -r
> > $ printf '%s\n' "$REPLY" | od -c
> > 0000000 \ \n
> > 0000002
> >
> > ## incorrect behaviour with delim='\0'
> > ## expected output is \ \0
> > $ printf '\\\000' | read -r -d ''
> > $ printf '%s\000' "$REPLY" | od -c
> > 0000000 \0
> > 0000001
> >
> > Philippe Bergheaud
> >
>
> The problem is not with read. The problem is the REPLY terminates with
the
> 0 bytes.
>
> The following should work:
> typeset -bZ2 var
> printf '\\\000' | read -r -d '' var
> print -n -v var | od -c
>
> typeset -b stores binary data. $var expands to the uuencoded value.
> print -v var
> for a binary variable, outputs the value of the variable.
> Also, printf "%B" will output the contents without expanding it.
>
>
> David Korn
> [email protected]
David, let me try to revive this thread before the next alpha release.
Your answer states that REPLY terminates with the 0 byte. If I understand
you well, when read -r -d '' is fed with '\' followed by '\0', then REPLY
should contain '\'. It is not the case: REPLY is empty -- this is the bug
I am trying to describe.
$ printf '\\\000' | od -c
0000000 \ \0
0000002
$ printf '\\\000' | read -r -d ''; printf '%s' "$REPLY" | od -c
0000000
I think that this is incorrect, and that one should expect the following
output instead:
$ printf '\\\000' | read -r -d ''; printf '%s' "$REPLY" | od -c
0000000 \
0000001
Let me explain my use case. I would like to use read -r -d '' as an
alternative to typeset -b. Would read -r -d '' behave as I expect, then
one could load the contents of a binary file in an array, without using
binary variables. Here is an example:
$ i=0; { while read -r -d '' A[i]; do ((i++)); done; } </bin/ls
The data in /bin/ls has been split on '\0', and the entries of the array A
contain the '\0' terminated chunks of data. This alternative to typeset
-b works fine for any kind of input data, except for the single pattern
'\' '\0', where '\' is lost.
Side note: ksh93v- crashes with Memory Fault on my Linux/Intel box when
the following alternative syntax is used:
$ i=0; { while read -r -d '' A[i++]; do true; done; } </bin/ls
Philippe
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