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

[彤彤 李 (@Supernb)]

彤彤 李 created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1250

Project:Branches: Supernb/rtems:issue-5420-pwdgrp-bsd to rtems/rtos/rtems:main
Author:   彤彤 李



This patch series reimplements the POSIX passwd and group entry APIs with BSD-licensed files-only implementations and removes the obsolete GPL passwd/group helper code.

Summary:

- Import the FreeBSD libc passwd/group sources under contrib as unchanged reference material.
- Add a BSD-licensed RTEMS default passwd/group file initialization helper.
- Reimplement the group database access routines in getgrent.c:
  - getgrent_r()
  - getgrnam_r()
  - getgrgid_r()
  - getgrent()
  - getgrnam()
  - getgrgid()
  - setgrent()
  - endgrent()
- Reimplement the passwd database access routines in getpwent.c:
  - getpwent_r()
  - getpwnam_r()
  - getpwuid_r()
  - getpwent()
  - getpwnam()
  - getpwuid()
  - setpwent()
  - endpwent()
- Preserve the existing RTEMS behavior of creating /etc, /etc/passwd, and /etc/group on demand.
- Remove the obsolete pwdgrp.c and pwdgrp.h helper implementation.
- Update getgroups() to handle the getpwuid_r() not-found case where the function returns zero with a NULL result pointer.
- Update pwdgrp test documentation to refer to the new default file initialization helper.

Validation performed on aarch64/zynqmp_qemu:

- ./waf
- psxpasswd01
- pwdgrp01
- pwdgrp02

All tests passed.

The POSIX Users Guide documentation update mentioned in the issue is not included yet. I can add it to this MR after initial review, or submit it as a follow-up patch if preferred.

Generative AI:

I used ChatGPT to help plan the implementation, review errors, draft commit messages, and prepare the merge request description. I manually applied the changes, built the tree, ran the tests, and reviewed the final patch series.

Related to #5420.

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