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Re: [Libguestfs] [hivex][PATCH] Increase filetime printing resolution to sub-second



On Wed, Oct 12, 2011 at 08:26:15PM -0700, Alex Nelson wrote:
> -  if (strftime (ret, TIMESTAMP_BUF_LEN, "%FT%TZ", tm) == 0) {
> +  if (strftime (ret, TIMESTAMP_BUF_LEN, "%FT%T", tm) == 0) {

It turns out there's a better way to do this (which I didn't know
about either -- thanks Jim Meyering).

Using the gnulib strftime replacement function, you can use %N for
nanoseconds, and you can also use a number in front to get the
required precision.

gnulib strftime is the same function that (GNU) date uses, hence you
can try it out:

$ date '+%T.%3N' ; date '+%T.%N'
14:25:27.840
14:25:27.842204825

The gnulib {,n}strftime function takes extra parameters, one of which
carries the nanosecond value (ns).  Have a look at
hivex.git/.gnulib/tests/test-strftime.c to see an example.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into Xen guests.
http://et.redhat.com/~rjones/virt-p2v


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