3e19ac3bad
normal libc versions of these functions use asprintf and sscanf, both of which aren't available in the libstand world. It's easier to rewrite these than to try to claw those functions into libstand. Also include uuid_create_nil, since it's safe to include. These were written from scratch, except for bits of comments that I got from the libc version, which are acknowledged in the source. Differential Revision: https://reviews.freebsd.org/D4540