Hi Thorsten,
I agree with the others, that's not a string you are processing.
Strictly speaking, PicoLisp text functions and PicoLisp strings (and
symbol names) must not contain NULL character.
How about processing this fixed-size values in binary, using (rd 'cnt)
and (wr 'cnt) ?
Important: The alternative argument of (rd) makes it work very
differently, the default behavior with 'sym argument is for PLIO (the
picolisp binary format).
It's also usually a bad idea to mix binary and text processing when
working with the same input channel, unless you really know about how
picolisp text procressing works (the character buffering, with a
character potentially being 1-4 bytes), so careful with that.
Greetings,
beneroth
On 13.02.24 20:30, Thorsten Jolitz wrote:
Hi Alex, Thomas,
thanks for your input, this is actually what I was looking for :
image.png
or even better:
image.png
I wonder if there actually is a way to directly print ^@ in PicoLisp
for a "non-printable" hex "00", instead of NIL?
Wrt the application, I just have to deal with fixed length hex strings
(!) where the values at certain offsets carry semantics, conversions
are done, and it's crucial that values stay in that position, the NUL
values matter. And I don't want to write a PicoLisp application for
this, I just wanted an easy way to produce the expected conversion
result in PicoLisp as a reference for comparison, and the above
solution is fine for that.
Am Di., 13. Feb. 2024 um 09:09 Uhr schrieb Alexander Burger
<picolisp@software-lab.de>:
Hi Thorsten,
> But shouldn't hex 232300002424 print to something like ##^N^N$$
instead of
> ##$$ ?
The problem is that you try to handle binary data as symbols. This
is not a good
idea. Binary data are numbers.
First of all, do you really have a hex message? Where does
it come from? Normally I would expect a list of numbers
as obtained with e.g.
(make (do 96 (link (rd 1))))
If it is really a hexadecimal string, you can obtain the list
of numbers with
: (make (for (L (chop "232300002424") (cut 2 'L)) (link (hex @))))
-> (35 35 0 0 36 36)
☺/ A!ex
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