Date: Mon, 8 Dec 2014 10:23:59 -0800 From: Garrett Cooper <yaneurabeya@gmail.com> To: Kirk McKusick <mckusick@mckusick.com> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>, Erik Trulsson <Erik.Trulsson.1013@student.uu.se>, dickey@his.com, jkh@freebsd.org Subject: Re: Reason for reordering /usr/share/misc/termcap.src for /usr/share/misc/termcap ? Message-ID: <745168FD-F296-427D-9AEB-79FD42038324@gmail.com> In-Reply-To: <201412081651.sB8GpbpO088722@chez.mckusick.com> References: <201412081651.sB8GpbpO088722@chez.mckusick.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--Apple-Mail=_A7597229-6A59-4733-B08D-A0F633B016D3 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 On Dec 8, 2014, at 8:51, Kirk McKusick <mckusick@mckusick.com> wrote: >> Date: Mon, 08 Dec 2014 13:13:40 +0100 >> From: Erik Trulsson <Erik.Trulsson.1013@student.uu.se> >> To: Garrett Cooper <yaneurabeya@gmail.com> >> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>, >> Kirk McKusick <mckusick@mckusick.com>, jkh@freebsd.org, >> dickey@his.com >> Subject: Re: Reason for reordering /usr/share/misc/termcap.src for = /usr/share/misc/termcap ? >> X-ASK-Info: Message Queued (2014/12/08 04:13:49) >> X-ASK-Info: Confirmed by User (2014/12/08 08:34:35) >>=20 >> Quoting Garrett Cooper <yaneurabeya@gmail.com>: >>=20 >>> Hi all, >>> I'm trying to resolve an issue where usr.bin/vi is needed to =20 >>> preprocess share/termcap every time make buildworld is invoked on =20= >>> FreeBSD. The termcap file reordering seems to have been done since =20= >>> the BSD 4.4 Lite sources were imported into FreeBSD: =20 >>> = https://svnweb.freebsd.org/base/projects/building-blocks/share/termcap/Mak= efile?view=3Dmarkup#l15, >>> https://svnweb.freebsd.org/base?view=3Drevision&revision=3D1638. >>> I don't have history behind why this should be done (it's = unfortunate >>> because it appears to mangle the comment <-> entry mappings, and >>> ultimately this gets put into termcap.db), and I was hoping that >>> someone with additional history could fill in why this is being = done. >>> Thank you! >>=20 >> It looks like it is done to put the most common (at the time it was =20= >> written) terminal types early in the reordered termcap file. This =20= >> presumably so that programs reading termcap would be more likely to =20= >> find the entry they wanted as quickly as possible. >>=20 >> That would have been useful when termcap was just a plain text file, =20= >> but if you are using termcap.db to look up terminal capabilities then = =20 >> there doesn't seem to be much point to doing such reordering = beforehand. >=20 > I believe Erik Trulsson's answer is correct. Termcap had grown very > large and on sub-1-MIP computers took a noticable delay to read on > every startup of programs using it. So, it was reordered to reduce > the startup time on common terminals. As Erik points out this = optimization > is no longer necessary as termcap is now placed in a database. Not to > mention that there are far fewer entries in it today than there were > at the peak of its existence. Ok. I=92ll do some double-checking to see whether or not something=92s = accessing the plaintext termcap file directly, but it helps to know the = history behind this (especially when the history in the installed file = gets muddled when ex is run on the file at build time). Thanks! --Apple-Mail=_A7597229-6A59-4733-B08D-A0F633B016D3 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQEcBAEBCgAGBQJUhey/AAoJEMZr5QU6S73eofgH/RqLchH2T9aiym3Bctx8y1I7 xOLMfcVm8hJjAiSjFkW0HDLVdWV+3uP3Y3CdI7tRF6oRKETMjRfS5/vykQHN0MkU 1SRwiNtpczPb+j25zkjHcJQW9Zi0NPJpTHzjqJ4FLJU90Uat3XyN4CjZlBXI3lBI kLb+cbYGbnJ7LvaXcDIDvMi62+WpI4Ct9+qNWfH8om611p7YNx9zEizbegabkzaL EgkTRKtQAFDXkzQf77puip3xW96XTNVuX7uFXu2/SwN/C7whuPegREdcvdCmmwen 2TfJYvCK+SP5++4+ndqYC+RSG8SHcj/iLTngCG+DTfMCFsGeeMbn9+kVDDuj5gg= =fjKD -----END PGP SIGNATURE----- --Apple-Mail=_A7597229-6A59-4733-B08D-A0F633B016D3--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?745168FD-F296-427D-9AEB-79FD42038324>