* printk of non NULL terminated strings ?
@ 2020-07-09 12:31 Joakim Tjernlund
2020-07-09 12:56 ` Andreas Schwab
0 siblings, 1 reply; 5+ messages in thread
From: Joakim Tjernlund @ 2020-07-09 12:31 UTC (permalink / raw)
To: linux-kernel
Is there a format (or other function) that lets me
print strings without an \0 terminator using an explicit length arg instead?
Something like:
printk("%s...", str, str_len); /* replace ... */
or some other funktion perhaps ?
Jocke
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: printk of non NULL terminated strings ?
2020-07-09 12:31 printk of non NULL terminated strings ? Joakim Tjernlund
@ 2020-07-09 12:56 ` Andreas Schwab
2020-07-09 13:26 ` Joakim Tjernlund
0 siblings, 1 reply; 5+ messages in thread
From: Andreas Schwab @ 2020-07-09 12:56 UTC (permalink / raw)
To: Joakim Tjernlund; +Cc: linux-kernel
On Jul 09 2020, Joakim Tjernlund wrote:
> Is there a format (or other function) that lets me
> print strings without an \0 terminator using an explicit length arg instead?
Use the precision.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: printk of non NULL terminated strings ?
2020-07-09 12:56 ` Andreas Schwab
@ 2020-07-09 13:26 ` Joakim Tjernlund
2020-07-09 13:30 ` Rasmus Villemoes
0 siblings, 1 reply; 5+ messages in thread
From: Joakim Tjernlund @ 2020-07-09 13:26 UTC (permalink / raw)
To: schwab; +Cc: linux-kernel
On Thu, 2020-07-09 at 14:56 +0200, Andreas Schwab wrote:
> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
>
>
> On Jul 09 2020, Joakim Tjernlund wrote:
>
> > Is there a format (or other function) that lets me
> > print strings without an \0 terminator using an explicit length arg instead?
>
> Use the precision.
Looking at that now but have a hard time figuring how to use it, can you give me an example?
Jocke
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: printk of non NULL terminated strings ?
2020-07-09 13:26 ` Joakim Tjernlund
@ 2020-07-09 13:30 ` Rasmus Villemoes
2020-07-09 15:28 ` Joakim Tjernlund
0 siblings, 1 reply; 5+ messages in thread
From: Rasmus Villemoes @ 2020-07-09 13:30 UTC (permalink / raw)
To: Joakim Tjernlund, schwab; +Cc: linux-kernel
On 09/07/2020 15.26, Joakim Tjernlund wrote:
> On Thu, 2020-07-09 at 14:56 +0200, Andreas Schwab wrote:
>> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
>>
>>
>> On Jul 09 2020, Joakim Tjernlund wrote:
>>
>>> Is there a format (or other function) that lets me
>>> print strings without an \0 terminator using an explicit length arg instead?
>>
>> Use the precision.
>
> Looking at that now but have a hard time figuring how to use it, can you give me an example?
Exactly as you'd do in userspace:
printf("%.*s\n", len, buf)
Of course, vsnprintf() will still stop if it encounters a nul byte
within those first len bytes in buf. And you need len to have type int,
so you may need a cast if you have a size_t or ssize_t or whatnot.
Rasmus
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: printk of non NULL terminated strings ?
2020-07-09 13:30 ` Rasmus Villemoes
@ 2020-07-09 15:28 ` Joakim Tjernlund
0 siblings, 0 replies; 5+ messages in thread
From: Joakim Tjernlund @ 2020-07-09 15:28 UTC (permalink / raw)
To: rasmus.villemoes, schwab; +Cc: linux-kernel
On Thu, 2020-07-09 at 15:30 +0200, Rasmus Villemoes wrote:
> On 09/07/2020 15.26, Joakim Tjernlund wrote:
> > On Thu, 2020-07-09 at 14:56 +0200, Andreas Schwab wrote:
> > > CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
> > >
> > >
> > > On Jul 09 2020, Joakim Tjernlund wrote:
> > >
> > > > Is there a format (or other function) that lets me
> > > > print strings without an \0 terminator using an explicit length arg instead?
> > >
> > > Use the precision.
> >
> > Looking at that now but have a hard time figuring how to use it, can you give me an example?
>
> Exactly as you'd do in userspace:
>
> printf("%.*s\n", len, buf)
>
> Of course, vsnprintf() will still stop if it encounters a nul byte
> within those first len bytes in buf. And you need len to have type int,
> so you may need a cast if you have a size_t or ssize_t or whatnot.
Thanks, this did the trick :)
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-07-09 15:28 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-09 12:31 printk of non NULL terminated strings ? Joakim Tjernlund
2020-07-09 12:56 ` Andreas Schwab
2020-07-09 13:26 ` Joakim Tjernlund
2020-07-09 13:30 ` Rasmus Villemoes
2020-07-09 15:28 ` Joakim Tjernlund
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.