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From: Junio C Hamano <gitster@pobox.com>
To: Jonathan Nieder <jrnieder@gmail.com>
Cc: David Turner <dturner@twosigma.com>, git@vger.kernel.org, l.s.r@web.de
Subject: Re: [PATCH v3 1/2] use HOST_NAME_MAX to size buffers for gethostname(2)
Date: Tue, 18 Apr 2017 19:57:31 -0700	[thread overview]
Message-ID: <xmqqzifdayuc.fsf@gitster.mtv.corp.google.com> (raw)
In-Reply-To: <20170419012824.GA28740@aiede.svl.corp.google.com> (Jonathan Nieder's message of "Tue, 18 Apr 2017 18:28:24 -0700")

Jonathan Nieder <jrnieder@gmail.com> writes:

>> @@ -274,7 +278,7 @@ static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
>>  			 * running.
>>  			 */
>>  			time(NULL) - st.st_mtime <= 12 * 3600 &&
>> -			fscanf(fp, "%"SCNuMAX" %127c", &pid, locking_host) == 2 &&
>> +			fscanf(fp, scan_fmt, &pid, locking_host) == 2 &&
>
> I hoped this could be simplified since HOST_NAME_MAX is a numeric literal,
> using the double-expansion trick:
>
> #define STR_(s) # s
> #define STR(s) STR_(s)
>
> 			fscanf(fp, "%" SCNuMAX " %" STR(HOST_NAME_MAX) "c",
> 			       &pid, locking_host);
>
> Unfortunately, I don't think there's anything stopping a platform from
> defining
>
> 	#define HOST_NAME_MAX 0x100
>
> which would break that.

Yes, that was exactly why I went to the xstrfmt() route when I sent
mine yesterday ;-).

> So this run-time calculation appears to be necessary.
>
> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>

Thanks.  

  reply	other threads:[~2017-04-19  2:57 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-18 21:57 [PATCH v3 0/2] gethostbyname fixes David Turner
2017-04-18 21:57 ` [PATCH v3 1/2] use HOST_NAME_MAX to size buffers for gethostname(2) David Turner
2017-04-19  1:28   ` Jonathan Nieder
2017-04-19  2:57     ` Junio C Hamano [this message]
2017-04-19 14:03     ` René Scharfe
2017-04-19 17:28     ` René Scharfe
2017-04-19 19:08       ` David Turner
2017-04-19 19:09       ` Torsten Bögershausen
2017-04-19 20:02         ` René Scharfe
2017-04-20 18:37           ` Torsten Bögershausen
2017-04-20 19:28             ` René Scharfe
2017-04-21  4:18               ` Torsten Bögershausen
2017-04-18 21:57 ` [PATCH v3 2/2] xgethostname: handle long hostnames David Turner
2017-04-19  1:35   ` Jonathan Nieder
2017-04-19  2:51     ` Junio C Hamano
2017-04-19 15:50       ` David Turner
2017-04-19 16:43         ` René Scharfe
2017-04-19  2:48   ` Junio C Hamano

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