linux-kernel - Re: [PATCH 8/8] tools, perf: Add asprintf replacement

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Date:	Mon, 20 Oct 2014 21:13:58 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	namhyung@...nel.org, acme@...nel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 8/8] tools, perf: Add asprintf replacement

On Mon, Oct 20, 2014 at 8:28 PM, Jiri Olsa <jolsa@...hat.com> wrote:
>> +int vasprintf(char **str, const char *fmt, va_list ap)
>> +{
>> +     char buf[1024];
>
> could you please make it work for generic buf len?

The actual size above doesn't matter, except for stack usage.
It could be 1 (are there any bugs triggered when using zero? ;-).
The real buffer is allocated by malloc() below.

>> +     int len = vsnprintf(buf, sizeof buf, fmt, ap);
>
> WARNING: sizeof buf should be sizeof(buf)
>
>> +
>> +     *str = malloc(len + 1);
>> +     if (!*str)
>> +             return -1;
>> +     strcpy(*str, buf);
>> +     return len;
>> +}

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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