If you are writing in C, then even if the machine is 32 bits, the C
language will normally give you a 64-bit integer data type, so you
should be able to do this really easily, and portable. The biggest
question when it comes to portability would be byte ordering...
In fairly modern C:
int64_t
in older:
long long
Johnny
On 2020-05-07 07:28, Baker, Lawrence M wrote:
Does anyone know of any portable OpenVMS 64-bit time conversion routines
written in C? I.e., that do not depend on 64-bit data types so they run
on 32-bit machines? Maybe in the SIMH GitHub? Out there in the Interland?
I am writing a simtools converter that combines on-disk OpenVMS Backup
save sets into a SIMH .tap image of an OpenVMS Backup ANSI tape volume.
I want to use the date the backup was done from the Backup save set
header for the ANSI HDR1 Creation Date.
You might ask why? Lately I have had to restore Backup save sets stored
on our NFS file server to SIMH VAXes over a DECnet/DAP-to-NFS gateway I
built a number of years ago. (I wrote to this group about it in a
thread about RSTS/E 10.1-L and Paper tape on January 6, 2016.) It takes
about 2 days to restore an ~8GB disk image backup from the NFS server,
though the gateway running on an SheevaPlug ARM SoC, to the SIMH VAX
running on my desktop iMac. I am working from home at the moment, of
course. I have become good friends with GNU screen because of SSH
inactivity disconnects and VPN failures. When I tried to restore a 75GB
disk, expecting it to take 10-14 days, our "friendly" IT security
monsters rebooted my iMac on me after 4 days. Grrr. I want to try
breaking the NFS file server transfer step from the SIMH VAX restore
operation. OpenVMS is not so easy as RSX was to read /FOREIGN disk
drives as files. I could not figure out a way to just MOUNT a Backup
save set as a SIMH disk image and get that to work. I was able to use
Mark's tar2mt converter and, using the proper OpenVMS MOUNT /RECORDSIZE
and /BLOCKSIZE qualfiers, was able to read a Backup save set from an
unlabeled tape image. Labeled tapes are easier to use then unlabeled
tapes, since the file names and file formats are on the tape with the
file data. I know how to write ANSI tape labels, so I have taken it
upon myself as a challenge to write a converter. I think this is the
last piece I need for what I want it to do. I'll certainly announce it
when it is done.
Thank you in advance for your help.
Larry Baker
US Geological Survey
650-329-5608
ba...@usgs.gov
_______________________________________________
Simh mailing list
Simh@trailing-edge.com
http://mailman.trailing-edge.com/mailman/listinfo/simh
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: b...@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
_______________________________________________
Simh mailing list
Simh@trailing-edge.com
http://mailman.trailing-edge.com/mailman/listinfo/simh
