[Bug 254092] libc: Please implement get_current_dir_name()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254092

            Bug ID: 254092
           Summary: libc: Please implement get_current_dir_name()
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: tobik at freebsd.org

It is a GNU extension that many ports have to patch away.  Ports
replace it with just getcwd(NULL, 0) but it is technically not really
equivalent to that, so it might be worth implementing it just for that.
See the glibc manual [1].  Providing it should not be that costly for us
I think.

musl libc provides an implementation that could be copied [2].

[1] http://www.gnu.org/software/libc/manual/html_node/Working-Directory.html
[2] https://git.musl-libc.org/cgit/musl/tree/src/misc/get_current_dir_name.c

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