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echo: os2prog
to: Erik Huelsmann
from: Jonathan de Boyne Pollard
date: 1995-02-10 04:29:54
subject: looking for routine to g

ZZ>
  > Is there anyone out there who has a routine to generate
  > completely unique filenames??
ZZ>

  One method is a simple loop trying to DosOpen() a file with
  OPEN_FAIL_IF_EXISTS, starting at 00000000.000 and working upwards.

ZZ>
  >  
  >  
  >  
ZZ>

  I see what you mean.  You want guaranteed uniqueness, under all
  circumstances.

ZZ>
  > these three make a total of 6 bytes. which is 12 digits
  > coded in hex, which is again one digit too much for  8.3 .
ZZ>

  Don't use hex then.  Use a higher base.  Including all letters of the
  alphabet takes you up to base 36.  In base 32, 6 bytes is less than 10
  digits.  Including all of the punctuation characters valid on SuperFAT
  will let you use even higher bases.  Remember that SuperFAT is
  case-insensitive, though.

  On the other hand, you could use long filenames (most of the non-FAT
  filesystems on OS/2 will allow this) and have simple human-readable
  filenames in the form :

       1995Feb09.211158.17.1.1

  Which is a lot easier to code.  (-:

  > JdeBP <
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