PN30641: INCORRECT RESULTS ARE RECEIVED ON A FILE OPENED AS TEXT WITH A LARGE BLOCK SIZE WHEN FTELL AND FSEEK ARE USED.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The ftell function fails to return the correct file position
  on an input file. This occurs when the file is opened as a
  text record and the file has a large block size. This error will
  then cause fseek and fwrite to write the wrong data to the out
  out file. The result is missing information in the out put file.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users that invoke ftell() using text files   *
  *                 that are fixed blocked.                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: ftell() function fails to record the    *
  *                      encoded file position for text files,   *
  *                      when blocksize of the file plus number  *
  *                      of new line characters is greater than  *
  *                      32K-1.                                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When running under MVS environment,  the maximum allowed
  blocksize is 32K.  The ftell function can encode file
  positions that are less than 131072 blocks.  However,  if
  you open a file in text stream mode and record format (recfm) is
  fixed blocked (FB) and the blocksize of the file plus the
  number of new-line characters is greater than 32K-1, then
  ftell function can only encode file positions that are less
  than 65536 blocks.
  
  When running under VM/CMS environment, for record size less
  than 32K, ftell function can encode file positions that are
  less than 131072 physical records.  However, for record sizes
  between 32K and 64K, the ftell function can only encode file
  positions that are less than 65536 physical records.
  If you attempt to use the ftell function for file position
  that are greater than the above specified limits, then ftell
  will fail.
  

Problem conclusion

• The problem has been corrected, however, ftell function can only
  encode file positions that are less than 65536 blocks, if you
  meet the conditions described in problem summary section.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PN27386

• APAR is sysrouted TO one or more of the following:

Modules/Macros

• EDCFOPEN EDCFOPOS EDCFOPST EDCINFO  FCB
  SYSIO
  

Fix information

• Fixed component name

  LE C LIBRARY

• Fixed component ID

  568819805

Applicable component levels

• R15M PSY UN32306

     UP93/02/11 P 9303

• R150 PSY

     UP

• R151 PSY UN32307

     UP93/02/12 P F302

Fix is available

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