linux-kernel - Re: [PATCH] tools: fread does not return negative on error

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Date:	Mon, 22 Jun 2009 17:47:07 +0200
From:	roel kluin <roel.kluin@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	git@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] tools: fread does not return negative on error

On Mon, Jun 22, 2009 at 5:34 PM, Ingo Molnar<mingo@...e.hu> wrote:
>
> * Roel Kluin <roel.kluin@...il.com> wrote:
>
>> size_t res cannot be less than 0. fread returns 0 on error.
>>
>> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
>> ---
>> Is this correct? please review.
>>
>> diff --git a/tools/perf/util/strbuf.c b/tools/perf/util/strbuf.c
>> index eaba093..376a337 100644
>> --- a/tools/perf/util/strbuf.c
>> +++ b/tools/perf/util/strbuf.c
>> @@ -259,7 +259,7 @@ size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
>>       res = fread(sb->buf + sb->len, 1, size, f);
>>       if (res > 0)
>>               strbuf_setlen(sb, sb->len + res);
>> -     else if (res < 0 && oldalloc == 0)
>> +     else if (res == 0 && oldalloc == 0)
>>               strbuf_release(sb);
>>       return res;
>
> This comes straight from Git's strbuf.c so i've Cc:-ed the Git list.
>
> Roel, did you get some compiler warning that made you look at this
> code?
>
>        Ingo
>

No, I use sed to catch these bugs.

Roel
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