Am 01.09.2020 um 22:29 schrieb Kurt-Karen Carlson-Lougheed via Cygwin:
Brian:
1. The Qsort() source I sent was from netbsd.org, NOT cygwin. netbsd works.
2. Complete package is on SourceForge as uac19 v3.3. I'm happy to send a
tgz if you prefer that. Read 3 choices at end before considering this.
3. Data is curl'd from owid as shown in the script example. Likewise I can
send a sample data set. The program analyzes COVID-19 csv files from either
owid or github/nytimes
4. I've used qsort() for years. I agree, keeping the sort routines simple
is always appropriate. I confirmed today the only ones that fail include
float divides, lDsort() and lXsort() in attached c19sort.c. When it's
pre-calculated and added to the struct it works, the code has a toggle now
for testing that.
Thomas:
I tried (again) today to build a simple test case. The data structures in
use are complex, probably the only thing I can attempt is stripping down
the code which will be very time consuming. I know you don't know me at
all, but I've written code, debugged proprietary operating systems
(assembler), performed OS dump analysis, troubleshot intermittent hardware
issues, identified disk firmware issues causing intermittent data
corruption, identified nfs performance issues, managed large hpc clusters,
etc. etc. etc. over 40+ years.
Your code does not even compile. I did not ask for a minimal test case
although that is generally appreciated. But a working test case at least
is required to establlish your claim of a bug.
I see three choices:
A. One of you look at simple the qqsort wrapper. I modified my code to
toggle between the functional netbsd Qsort() and cygwin qsort(). I have
demonstrated erroneous results coming from the cygwin version in a small
percentage of requests. If you can acknowledge that, perhaps you can check
the cygwin version of qsort() vs. the current netbsd.org?
B. If you could kindly provide me or point me to the cygwin qsort() source
I'll check it out myself.
C. We can thank each other and leave cygwin's qsort() as is broken in some
small number of circumstances since I've compiled netbsd's into my code and
that always works.
Regards, kurt
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