dma: restore addition of newline when missing from input

[emaste]

Summary

If input mail does not have a newline on the last line dma must add one. This was broken by the addition of long-line splitting, with the switch from strlen(line) to linelen returned by getline().

PR: 266629
MFC after: 1 week
Fixes: b0b2d05fd060 ("Split body of mails not respecting...")
Sponsored by: The FreeBSD Foundation

[emaste]

I don't really like this, but also want to avoid any larger rework independent of upstream. This could be cleaned up as part of a project to upstream long-line splitting.

[mslehto_kapsi.fi]

Looks good to me, just small inline comment or question regarding linecap.

contrib/dma/mail.c

423

Does it matter here when "linecap" is not updated after succesful realloc()?

If not, simplicity is definitely good in exchange for upstream compatibility!

[emaste]

contrib/dma/mail.c

423

Yes, I think it would have no functional issue to leave it, but should be updated.

[emaste]

update linecap

[mslehto_kapsi.fi]

Revision D36763 / 111185 works for me: code compiles and does not produce "corrupted queue files" error.