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

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Message-ID: <20090622153431.GA18466@elte.hu>
Date:	Mon, 22 Jun 2009 17:34:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Roel Kluin <roel.kluin@...il.com>, git@...r.kernel.org
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] tools: fread does not return negative on error


* 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
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