printf.9: Support more than 32 bits in %b

[tuexen]

Summary

This will be usable after clang has been extended to accept length modifiers for %b when compiling kernel code. But we need FreeBSD to support it first...

[markj]

share/man/man9/printf.9

182

Extra newline. (It would be better to remove it from the previous example.)

sys/kern/subr_prf.c

971

Can we not support a modifier, so %lb takes a long, %jb takes an intmax_t, etc., instead of having this ad-hoc encoding?

[tuexen]

The example should follow style.9 as suggested by Mark.

[tuexen]

share/man/man9/printf.9

182

Fixed. The previous example has been fixed in a separate commit.

sys/kern/subr_prf.c

971

That is already supported by the code above. But you need to be able to specify bit positions from 1 to 128 now. The positions from 1 to 32 are encoded as characters from \01 to \40. So you need a way to encode the other positions. OpenBSD also uses the characters from \200 to \377 for it. If you have a different idea, I am happy to explore it.

Once this is in, I need to change clang such that it knows that you can use a length modifier (like l or j) in combination with %b. Right now it is warning that you can only use a 32-bit entity. But when you just ignore the warning, it works. Fixing clang is the next step when this change is in.