Article View: comp.sources.bugs
Article #2174Re: sc 6.1 - Allow ANSI pre-processor and read-only strings
From: John Woods
Date: Mon, 03 Apr 1989 21:04
Date: Mon, 03 Apr 1989 21:04
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1421 bytes
In article <16445@yoyodyne.mips.COM>, koblas@mips.COM (David Koblas) writes:
> In article <137@titania.warwick.ac.uk> cudcv@warwick.ac.uk (Rob McMahon) writes:
> >! #define ctl(x) ('x'&037)
> >--- 65,71 ----
> >! #define ctl(x) ((x)&037)
>
> Instead of doing this change there is a much simpler solution, which
> of course allows you to not make such a huge change to existing code.
>
> #ifdef __STDC___
> # define ctl(x) (#x[0]&037)
> #else
> # define ctl(x) ('x'&037)
> #endif
>
However, this solution does not handle the case of non-ANSI compilers which
do not have the undocumented Reiser CPP features. The first solution is
correct for Classic C as documented in "The Old Testament" (K&R I), and for
all existing (correct) C compilers, Reiserish or not.
--
John Woods, Charles River Data Systems, Framingham MA, (508) 626-1101
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!decwrl!pyramid!prls!philabs!linus!raybed2!rayssd!mirror!frog!john From: john@frog.UUCP (John Woods) Newsgroups: comp.sources.bugs Subject: Re: sc 6.1 - Allow ANSI pre-processor and read-only strings Message-ID: <1196@frog.UUCP> Date: 3 Apr 89 21:04:00 GMT References: <137@titania.warwick.ac.uk> <16445@yoyodyne.mips.COM> Organization: Misanthropes-R-Us Lines: 27