[Fontconfig] FcFontList() can return NULL - should it? should it be documented?

[Behdad Esfahbod]

My understanding is that fontconfig API returns NULL only on allocation
failures.  So, I think you've hit a bug.

On Aug 25, 2016 1:19 PM, "Alan Coopersmith" <alan.coopersmith at oracle.com>
wrote:

> While assisting with the investigation of:
>     [JDK-8160664] JVM crashed with font manager on Solaris 12
>     https://bugs.openjdk.java.net/browse/JDK-8160664
> we discovered that if none of the font directories are present on the
> system
> FcFontList() returns NULL, but if at least one is present, even if empty,
> then it returns a valid pointer to a list of 0 entries.
>
> This doesn't seem to be documented anywhere that I can find, but you
> can see the fc-list utility checks for it all the way back to the
> first revision in git.   Is this intentional?  Should it be documented
> so other application authors know to check for NULL?
>
> --
>         -Alan Coopersmith-              alan.coopersmith at oracle.com
>          Oracle Solaris Engineering - http://blogs.oracle.com/alanc
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