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  2. RPG400-L
  3. October 2008

Re: Sorting arrays

Rory Hewitt wrote:
As you can see, I didn't use the same-named fields that Booth used, because
I basically cut 'n' pasted my own code in there.

If you wanted, you could hold the buffer positions of the various fields in
the DS in a compile-time array and then simply use memcmp() or memicmp() in
sortproc. That would *greatly* simplify the code in sortproc()...


I wouldn't use memcmp or memicmp for comparing data structure subfields. It only works for fixed-length character, unsigned integer, *ISO dates and timestamps. For every other data type, doing a memory compare gives incorrect results.

For example, with zoned subfields, -456 (x'F4F5D6') compares greater than zoned 123 (x'F1F2F3'). Varying length 'abc' (x'0003818283') compares greater than 'b' (x'000182'). Varying length 'a' might not compare equal to 'a', depending on what junk followed the current data in each field.


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