Date: Wed, 10 May 2023 23:09:11 +0200 From: Steffen Nurpmeso <steffen@sdaoden.eu> To: Dag-Erling =?utf-8?Q?Sm=C3=B8rgrav?= <des@FreeBSD.org> Cc: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: Re: git: 09aee570980b - main - tsort: Add unit tests. Message-ID: <20230510210911.Hkz2z%steffen@sdaoden.eu> In-Reply-To: <202305101346.34ADkIp8021360@gitrepo.freebsd.org> References: <202305101346.34ADkIp8021360@gitrepo.freebsd.org>
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Hello. Dag-Erling Sm=C3=B8rgrav wrote in <202305101346.34ADkIp8021360@gitrepo.freebsd.org>: |URL: https://cgit.FreeBSD.org/src/commit/?id=3D09aee570980b7eca6e3c902a66= f\ |6db129b8c7376 | |commit 09aee570980b7eca6e3c902a66f6db129b8c7376 |Author: Dag-Erling Sm=C3=B8rgrav <des@FreeBSD.org> |AuthorDate: 2023-05-10 13:45:44 +0000 |Commit: Dag-Erling Sm=C3=B8rgrav <des@FreeBSD.org> |CommitDate: 2023-05-10 13:45:44 +0000 | | tsort: Add unit tests. ... | Differential Revision: https://reviews.freebsd.org/D40043 ... |+cycle_body() |+{ |+ cat >input <<EOF |+A B |+A F |+B C |+B D |+D E |+D A |+EOF |+ cat >output<<EOF |+D |+E |+A |+F |+B |+C |+EOF As i saw it fly by there was [1], and already the next POSIX[.1-2023?] will (i think) say If a cycle is found in the input, diagnostic or warning messages shall be written to standard error reporting that there is a cycle and indicating which nodes are in the cycle(s). If the -w option is specified, these messages shall be diagnostic messages. If a diagnostic message is written, the final exit status shall be non-zero. (The -w option was also added.) [1] https://austingroupbugs.net/view.php?id=3D1617 Linux tools all fail and do not try to resolve cycles at all. #?0|kent:$ cat <<_EOT | tsort # GNU coreutils > A B > A F > B C > B D > D E > D A > _EOT tsort: -: input contains a loop: tsort: A tsort: B tsort: D A F B D C E #?1|kent:$ cat <<_EOT | busybox.static tsort A B A F B C B D D E D A _EOT tsort: cycle at A A F B D E C (Greetings to the island of happy red devils.) --steffen | |Der Kragenbaer, The moon bear, |der holt sich munter he cheerfully and one by one |einen nach dem anderen runter wa.ks himself off |(By Robert Gernhardt) |~~ |..and in spring, hear David Leonard sing.. | |The black bear, The black bear, |blithely holds his own holds himself at leisure |beating it, up and down tossing over his ups and downs with pleasure |~~ |Farewell, dear collar bear
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