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[UDUNITS #MGE-245661]: perl-package for udunits2? debian packages?
- Subject: [UDUNITS #MGE-245661]: perl-package for udunits2? debian packages?
- Date: Fri, 31 Jul 2009 10:20:07 -0600
Heiko,
> while working with the perl-udunits2 package, I recognized the following;
>
> • ut_free_system: segmentation-fault when freeing same system* twice
That's not a bug. It's like passing a pointer to the function free() twice,
resulting in undefined behavior. The description of the ut_free_function()
says this:
Use of [the pointer argument] after this function returns results in
undefined behavior.
The documentation of the free() function says something similar.
You should modify your code so that it calls ut_free_system() only once for
each pointer. Alternatively, set the value of the pointer to NULL upon return
from the ut_free_system() function.
> • several errors in definition files, e.g. Definition of "microns" in
> "/home/heikok/Programme/Perl/Udunits/share/udunits2-common.xml", line
> 296, overrides prefixed-unit "1e-15 second"
Those messages are warnings: they don't indicate an error. Before the parser
encountered the "micron" unit, it would have parsed the string "microns" as
"micro nanoseconds" or "1e-15 seconds". The parser is letting you know that
this will no longer happen. You can disable these warning messages via the
function ut_handle_error_message() if you wish.
> • chapter 5 in c-api doc (ut_parse) should be merged with 3.2 (ut_get_unit*)
I wondered about that. The ut_parse() and ut_get_unit() functions are
different, however. The ut_parse() function accepts arbitrary string unit
specifications, which includes prefixes and mathematical operations; whereas,
the ut_get_unit() function requires a simple, single unit specification -- no
prefixes or operations allowed.
Maybe I should switch chapters 4 and 5 so that the chapter on parsing an
arbitrary unit specification would follow the chapter on getting a particular
unit from a unit system. What do you think?
> Heiko
Regards,
Steve Emmerson
Ticket Details
===================
Ticket ID: MGE-245661
Department: Support UDUNITS
Priority: Normal
Status: Closed