RTEMS | Draft: libcsupport: Reimplement POSIX passwd and group entry APIs (!1250)

[彤彤 李 (@Supernb)]

彤彤 李 commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1250#note_150584


Thanks for the review. I understand the main issue now: the implementation should be based directly on the imported FreeBSD code, rather than using the FreeBSD import only as reference material.

I will rework this draft MR accordingly:

* re-import the FreeBSD sources from the official upstream at `https://cgit.freebsd.org/src/`, using a recent release source
* keep the `contrib/` import as unchanged upstream reference code
* base the `libcsupport/src` passwd/group implementation directly on the FreeBSD sources
* keep RTEMS-specific changes small and guarded where appropriate
* keep the default `/etc/passwd` and `/etc/group` creation logic in a separate RTEMS helper file
* address the review comments about license headers, prototypes coming from headers, `RTEMS_ALIGN_UP`, comments for helper functions, and style issues
* handle the POSIX Users Guide documentation in a separate MR to `rtems-docs`

I will leave the inline threads open for now and resolve them after pushing the reworked series.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1250#note_150584
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