Implement ftw.h

[vibhavp]

It would be nice to have ftw.h support in haiku: ​http://pubs.opengroup.org/onlinepubs/7908799/xsh/ftw.h.html

[landonf]

ftw(3), nftw(3), and fts(3) implementation

[landonf]

I was working on some portable code that required fts(3) directory traversal on Haiku, so I went ahead and integrated this. The patch is a direct port of FreeBSD's fts(3) (defacto standard), on top of which the POSIX ftw(3) and nftw(3) functions are implemented.

[korli]

Why removing the flag FTS_WHITEOUT?

BTW I'm unsure we drop BSD headers (even POSIX) in headers/posix/

[landonf]

Thanks for reviewing!

Why removing the flag FTS_WHITEOUT?

AFAIK it's FreeBSD-specific (eg, unionfs) and not supported anywhere else. Do you want me to leave the flag defined and just disable the FreeBSD-specific whiteout code? I believe that would match glibc's approach.

BTW I'm unsure we drop BSD headers (even POSIX) in headers/posix/

I wasn't sure about the correct directory, but it seemed in good company. Happy to move it there's a preferred location.

[korli]

Replying to landonf:

AFAIK it's FreeBSD-specific (eg, unionfs) and not supported anywhere else. Do you want me to leave the flag defined and just disable the FreeBSD-specific whiteout code? I believe that would match glibc's approach.

No, just not defining FTS_WHITEOUT with a __HAIKU__ check would be fine.

I wasn't sure about the correct directory, but it seemed in good company. Happy to move it there's a preferred location.

Sure. It could be rewritten later anyway.

[landonf]

Great, updated patch attached with FTS_WHITEOUT changes.

[korli]

Thanks, applied in hrev45148!