From: Martin Harriss <martin@Princeton.EDU>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] /sys/src/cmd/chmod.c
Date: Wed, 31 Dec 2003 10:25:29 -0500 [thread overview]
Message-ID: <3FF2EA69.9030704@Princeton.EDU> (raw)
In-Reply-To: <20031231163240.Z25949@cackle.proxima.alt.za>
Defensive programming?
Martin
Lucio De Re wrote:
> This struck me, looking at recent changes to chmod(1) which allow one
> to flag a file as "not to be included in nightly archives":
>
> for(; *s ; s++){
> switch(*s){
> case 'r':
> mode |= A(DMREAD); break;
> case 'w':
> mode |= A(DMWRITE); break;
> case 'x':
> mode |= A(DMEXEC); break;
> case 'a':
> mode |= DMAPPEND; break;
> case 'l':
> mode |= DMEXCL; break;
> case 't':
> mode |= DMTMP; break;
> default:
> return 0;
> }
> }
> if(*s != 0)
> return 0;
>
> I can't see how *s can be non-zero on exit from the for loop. Is
> my C programming _so_ rusty?!
>
> ++L
>
next prev parent reply other threads:[~2003-12-31 15:25 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-31 14:32 Lucio De Re
2003-12-31 15:25 ` Martin Harriss [this message]
2004-01-05 11:03 ` Zhen Lin
2004-01-05 15:26 ` ron minnich
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