From: arne@vajhoej.dk   
      
   On 9/5/2025 7:12 PM, Waldek Hebisch wrote:   
   > Arne Vajhøj  wrote:   
   >> On 9/5/2025 1:40 PM, Waldek Hebisch wrote:   
   >>>                          I would expect that having records   
   >>> of length 3 and then setting length to 2 would also truncate   
   >>> data in the records.   
   >>   
   >> $ set file/attr does not change the content of the file only the   
   >> file header meta data.   
   >>   
   >> AAA   
   >> BBB   
   >> CCC   
   >>   
   >> 41 41 41 00   
   >> 42 42 42 00   
   >> 43 43 43 00   
   >>   
   >> does not become:   
   >>   
   >> AA   
   >> BB   
   >> CC   
   >>   
   >> 41 41   
   >> 42 42   
   >> 43 43   
   >>   
   >> but:   
   >>   
   >> AA   
   >> A*   
   >> BB   
   >> B*   
   >> CC   
   >> C*   
   >>   
   >> 41 41   
   >> 41 00   
   >> 42 42   
   >> 42 00   
   >> 43 43   
   >> 43 00   
   >   
   > I am not sure how you are getting result above.  I created a   
   > simple variable length file and I get:   
   >   
   > $ set FILE/ATTR=LRL:2 VTST.TXT   
   > $ type VTST.TXT   
   > a   
   > bcd   
   > $ set FILE/ATTR=LRL:1 VTST.TXT   
   > $ type VTST.TXT   
   > a   
   > bcd   
   >   
   > That is 'type' is getting right records regardless of my LRL setting.   
   > Naive program could truncate records.  Slightly better one   
   > could get records in pieces of size corresponding to   
   > LRL (possibly creating more record on output than is present in   
   > the input).  But truncating with odd LRL setting and reading   
   > record padding bytes with even LRL setting look like a bug   
   > (which may remain unfixed forever due to requirement for   
   > bug compatibility).   
      
   Sorry. I am still messing around in RFM FIX.   
      
   It can be deduced from the hex, but I should have been explicit.   
      
   I create the FIX file simply by creating a VAR in EVE and do a:   
      
   $ convert/fdl="record;format fixed;size 3" var-file fix-file   
      
   I think VAR is way less sensitive to MRS/LRL than FIX.   
      
   VAR use the length in the record prefix. FIX has to take the length   
   from the header.   
      
   Arne   
      
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