[Libguestfs] [nbdkit PATCH 3/5] api: Add nbdkit_string_intern helper
Richard W.M. Jones
rjones at redhat.com
Wed Aug 26 13:35:54 UTC 2020
On Wed, Aug 26, 2020 at 08:33:39AM -0500, Eric Blake wrote:
> On 8/25/20 3:32 PM, Eric Blake wrote:
>
> >>>- keys[optind] = strndup (argv[optind], n);
> >>>- if (keys[optind] == NULL) {
> >>>- perror ("strndup");
> >>>+ CLEANUP_FREE char *key = strndup (argv[optind], n);
> >>>+ const char *safekey = nbdkit_string_intern (key);
> >>>+ if (safekey == NULL)
> >>> exit (EXIT_FAILURE);
> >>
> >>It seems it might also be nice to have a "strndup" version of the
> >>intern function.
> >
> >Or even a memdup. Yeah, those are possibilities as well. Doing
> >all three (strdup, strndup, memdup) up front isn't hard. If API
> >proliferation is a problem, you can combine strdup and strndup by
> >accepting -1 as a length to mean stop at NUL termination; but I'm
> >less worried about API proliferation and more about ease-of-use.
>
> Time for some name bike-shedding. How about:
>
> nbdkit_strdup_intern (const char *)
> nbdkit_strndup_intern (const char *s, size_t)
>
> and if we need something that permits embedded NUL (right now I
> don't have such a use) we could add
> nbdkit_memdup_intern (const void *s, size_t)
Seems good to me. Do you think we'll be able to get the final APIs
into nbdkit this week? I don't much care about finishing the
implementation, just that any APIs we add wont need to be changed
later.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines. Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v
More information about the Libguestfs
mailing list