IBM i code page / CCSID

All,

I'm a newbie programmer on IBM i (OS/400) and I need a little bit of help.

I'm having a weird problem with EBCDIC and square brackets, pretty much as described here: https://www.ibm.com/support/pages/what-impact-changing-qccsid-shipped-65535-another-ccsid

Recently, a customer was trying out a program but it was not working. It took a couple of days to realize that they were running their system on a different code page. At first, I thought I would add their code page to the hard-coded list but then I thought that solution was stupid and started hunting for a proper solution.

I decided that what I needed was a lookup table based on the code page (CCSID) and the HEX values for the square brackets. The trick was figuring out how to get the code page from the OS (operating system). After what felt like a millions searches, I can across the nl_langinfo subroutine. It is available on AIX, Linux, IBM i and z/OS. If you call nl_langinfo subroutine with the parameter of CODESET then it will return the code page (aka code set, CCSID) as a string.

Next, I found 101 EBCDIC code pages and created a lookup table of the square brackets in sorted order by code page. Finally, I created a routine to issue the nl_langinfo subroutine and then perform a binary search of the lookup table and set the correct square brackets for the program to use.

I found what I thought was a solution by using the nl_langinfo(CODESET) call as detailed here: https://www.ibm.com/docs/en/i/7.5?topic=functions-nl-langinfo-retrieve-locale-information

I wrote about the lookup table and routine here: https://www.capitalware.com/rl_blog/?p=7060

When I run a test program with the nl_langinfo(CODESET) call on my system, it returns 37 for the code page/CCSID.  When I run the following commands on my system:

DSPSYSVAL SYSVAL(QCCSID)
DSPSYSVAL SYSVAL(QCHRID)

They both return code page/CCSID of 37.

So I gave the test program to the customer.  When they run the program it returns 37 for the code page/CCSID.  But when the customer run those 2 "DSPSYSVAL SYSVAL" commands, they return 273 for code page/CCSID. And yes they are in Europe.

So, my question is to those IBM i experts, what am I doing wrong. Note: The code that I am using was posted in my blog posting.  I don't understand why it didn't return 273 for code page/CCSID.

Is there a better way from a C program to retrieve the correct code page/CCSID from the IBM i system?

Help please.

Regards,
Roger Lacroix
Capitalware Inc.