Re: [PATCH] commands/crc: assert newline after output with big offsets

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

Hello Sascha,

On Wed, Jun 27, 2012 at 11:08:33AM +0200, Uwe Kleine-König wrote:
> This fixes
> 
> 	barebox@Very long board name:/ crc32 -f /dev/mem 0x83f00000+0xfff
> 	CRC32 for /dev/mem 0x83fff000 ... 0x83fffffe ==> 0xa080584bbarebox@Very long board name:/
> 
> The problem here was that the return value of
> lseek(fd, 0x83f00000, SEEK_SET) (which is 0x83f00000) was casted to an
> int (which is -2081423360), returned to do_crc and interpreted as
> error there without yielding another error message.
> 
> This also makes
> 
> 	crc32 -f /dev/mem 0xffffffff+0x1
> 
> die on a NULL pointer exception instead of reporting:
> 
> 	lseek: No error
> 
> :-)
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> ---
> On Wed, Jun 27, 2012 at 10:25:37AM +0200, Sascha Hauer wrote:
> > On Wed, Jun 27, 2012 at 10:13:13AM +0200, Uwe Kleine-König wrote:
> > > Without this patch the next command prompt starts directly after the
> > > calculated check sum. While at it also fix the coding style.
> > 
> > Under which conditions does this happen? The newline should be appended in
> > do_crc()
> You're right, my patch was not correct. This version should do the right
> thing now.
ping

>  commands/crc.c |    7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/commands/crc.c b/commands/crc.c
> index df22941..10a2900 100644
> --- a/commands/crc.c
> +++ b/commands/crc.c
> @@ -47,9 +47,12 @@ static int file_crc(char* filename, ulong start, ulong size, ulong *crc,
>  	}
>  
>  	if (start > 0) {
> -		ret = lseek(fd, start, SEEK_SET);
> -		if (ret == -1) {
> +		off_t lseek_ret;
> +		errno = 0;
> +		lseek_ret = lseek(fd, start, SEEK_SET);
> +		if (lseek_ret == (off_t)-1 && errno) {
>  			perror("lseek");
> +			ret = -1;
>  			goto out;
>  		}
>  	}
> -- 
> 1.7.10
> 
> 
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-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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