On 11/20/2015 10:45 AM, jfbu wrote:

Le 20 nov. 2015 à 10:33, Hans Hagen <[email protected]> a écrit :

On 11/20/2015 9:54 AM, jfbu wrote:

Le 19 nov. 2015 à 23:44, jfbu <[email protected]> a écrit :

Hi,

this might be the same issue than one with \scantokens
which was discussed some time ago on this list (lost the reference)

this was

http://tug.org/pipermail/luatex/2015-March/005138.html
[luatex] behavior of \write in LuaTeX differs from the one of   PdfTeX/XeTeX

which referenced some other threads,

I tried also running pdftex with -8bit switch which
was mentioned by Hans in the previous thread and this gives

This is pdfTeX, Version 3.14159265-2.6-1.40.16 (TeX Live 2015) (preloaded 
format=pdftex 2015.10.14)  20 NOV 2015 09:50
entering extended mode
  restricted \write18 enabled.
  %&-line parsing enabled.
**testlualog.tex
(./testlualog.tex macro:->\romannumeral ` foo bar foo bar foo bar
macro:->\romannumeral ` foo bar foo bar foo bar
  )

  (contains two null characters)

The log with luatex is:

This is LuaTeX, Version beta-0.80.0 (TeX Live 2015) (rev 5238) (format=luatex 
2015.10.14)  20 NOV 2015 09:53
  restricted \write18 enabled.
**\input testlualog.tex
(./testlualog.tex macro:->\romannumeral ` foo bar foo bar foo bar
macro:->\romannumeral `
)

only one null character in \message output

in \write output the null character is not there
(and the other things are gone)
best,

well, because we're in a mixed tex/lua environment 0's can  always be sort of an 
issue .. just try to avoid them .. the times that we needed those slots for fonts 
are gone (in fact: avoid chars < 32)


I see, but the null slot here is not used for typesetting but
for TeX programming tricks. The specific issue I face can

use other tricks (or don't care about the log)

be overcome by checking for Lua engine and doing extra things
(the goal is to provide some info in the log, it is peripheral
to the main package activities, but dropping it would mean
I must add an explication in the user manual as well)
but I am wondering:

as LuaTeX enhances greatly all TeX abilities, does not that
include processing of files which may legitimately contain
ascii chars < 32 ? isn't it paradoxal if such non-typographical
programming like manipulations of data files suffers some
limitation of \write under LuaTeX ?

it enhances and also changes a few things .. if you want to manipulatev data in luatex use lua

and why does \message behave differently than \write ?

different code paths

Hans

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