https://bugs.openldap.org/show_bug.cgi?id=9239
--- Comment #2 from Howard Chu hyc@openldap.org --- (In reply to Howard Chu from comment #1)
(In reply to Ryan Tandy from comment #0)
It appears this version of vsnprintf cannot handle the %s argument being NULL.
Correct, stdio on Solaris always expects %s args to be non-NULL.
... *string* arguments ... same applies to strchr/strlen etc...