Re: [PATCH 02/10] builtin/index-pack.c: convert trivial snprintf calls to xsnprintf

From: Jeff King <peff@peff.net>
Date: Jun 3, 2016, 08:53 UTC
Message-ID: <20160603085320.GC28401@sigill.intra.peff.net>
In-Reply-To: <20160603074724.12173-2-gitter.spiros@gmail.com>

On Fri, Jun 03, 2016 at 07:47:16AM +0000, Elia Pinto wrote:

Show 12 quoted lines

> diff --git a/builtin/index-pack.c b/builtin/index-pack.c
> index e8c71fc..c032fe7 100644
> --- a/builtin/index-pack.c
> +++ b/builtin/index-pack.c
> @@ -1443,7 +1443,7 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
>  		printf("%s\n", sha1_to_hex(sha1));
>  	} else {
>  		char buf[48];
> -		int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
> +		int len = xsnprintf(buf, sizeof(buf), "%s\t%s\n",
>  				   report, sha1_to_hex(sha1));
>  		write_or_die(1, buf, len);

So it's pretty unclear here whether that 48 is big enough (it is, if you read the whole function, because "report" is always a 4-char string). Yuck. At least there should be a comment explaining why 48 is big enough.

-Peff