linux-kernel - Re: [PATCH] IDE-TAPE NULL terminate strings.

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Date:	Tue, 23 Sep 2008 21:10:43 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Mark de Wever <koraq@...all.nl>
Cc:	petkovbb@...il.com, Gadi Oxman <gadio@...vision.net.il>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IDE-TAPE NULL terminate strings.

Mark de Wever wrote:

>>>diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
>>>index 1bce84b..c41f5b1 100644
>>>--- a/drivers/ide/ide-tape.c
>>>+++ b/drivers/ide/ide-tape.c
>>>@@ -2338,7 +2338,7 @@ static void idetape_get_inquiry_results(ide_drive_t *drive)
>>> {
>>> 	idetape_tape_t *tape = drive->driver_data;
>>> 	struct ide_atapi_pc pc;
>>>-	char fw_rev[6], vendor_id[10], product_id[18];
>>>+	char fw_rev[6] = {'\0'}, vendor_id[10] = {'\0'}, product_id[18] = {'\0'};

>>  Do you realize how much *absolutely unnecessary* code will this bring
>>in?

> I did not, I just had a look at the code GCC produced. I did expect much
> smaller code, but maybe that's only generated with -Os.

    My imagination sufficed to foresee how much code a compiler would have to 
produce to completely initialize the arrays of the *auto* memory class -- even 
regardless of optimization. And all that mostly to no purpose.

>>This is certainly worse than your initial patch (if it was correct).

> My initial patch did work, 

    If ide_fixstring() wouldn't have to do any space compression, it would 
work. If it would have to compress spaces, 2 garbage characters would be 
copied by it and then printed.

> but that doesn't matter much, since Boris
> posted another patch based on your suggestions. I like that patch better
> as my initial patch. I'm testing it now and I expect it to work.

    Me too. :-)

> Regards,
> Mark de Wever

WBR, Sergei
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