Date: Tue, 29 Dec 2009 07:46:58 -0500 From: John Baldwin <jhb@freebsd.org> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: Luigi Rizzo <luigi@freebsd.org>, src-committers@freebsd.org, Bruce Evans <brde@optusnet.com.au>, svn-src-user@freebsd.org Subject: Re: svn commit: r201063 - user/luigi/ipfw3-head/sys/netinet/ipfw Message-ID: <200912290746.59011.jhb@freebsd.org> In-Reply-To: <20091228232151.GA39294@onelab2.iet.unipi.it> References: <200912272213.nBRMDJAC069043@svn.freebsd.org> <20091229021846.U46429@delplex.bde.org> <20091228232151.GA39294@onelab2.iet.unipi.it>
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On Monday 28 December 2009 6:21:51 pm Luigi Rizzo wrote: > On Tue, Dec 29, 2009 at 02:38:15AM +1100, Bruce Evans wrote: > > On Sun, 27 Dec 2009, Luigi Rizzo wrote: > > > > >Log: > > > use a less obfuscated construct to call the hook/unhook functions > > > > > >Modified: > > > user/luigi/ipfw3-head/sys/netinet/ipfw/ip_fw_pfil.c > > > > Better unobfuscation: > > > > >Modified: user/luigi/ipfw3-head/sys/netinet/ipfw/ip_fw_pfil.c > > >============================================================================== > > >--- user/luigi/ipfw3-head/sys/netinet/ipfw/ip_fw_pfil.c Sun Dec 27 > > >21:58:48 2009 (r201062) > > >+++ user/luigi/ipfw3-head/sys/netinet/ipfw/ip_fw_pfil.c Sun Dec 27 > > >22:13:19 2009 (r201063) > > >@@ -329,18 +329,17 @@ ipfw_divert(struct mbuf **m0, int incomi > > >static int > > >ipfw_hook(int onoff, int pf) > > >{ > > >+ const int arg = PFIL_IN | PFIL_OUT | PFIL_WAITOK; > > > > Don't add this obfuscation (a constant used only once stored in a variable > > used only once, just to avoid 2 long lines (1 after my change). > > It is not just that. > > I want to tell humans reading the code that the value used in the > two calls is exactly the same, beyond any chance of misspelling or > misreading the two long lines. > > Then whether or not to store it in a variable is compiler's business, > same as if i use the constant FOO ( #define FOO 0x11122334455667788LL ) > 20 times in a piece of code. Bruce's cute ?: trick for picking which function pointer to invoke avoided that problem FWIW as the flags were only passed once. -- John Baldwin
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