dtrace discuss - Apr 2011 - tracemem() output on single line

Hi all,

Is it somehow possible to use tracemem() (or anything else which is able 
to print array of uchar_t''s or string) to print stream of bytes in 
hexadecimal on single line ?

I''d like to do something like this:

         printf("0x");
         tracemem(this->oinfo.xxx_id, 32);
         printf("A:%-15s ... \n",
             this->oinfo.xxx_raddr,
             ...

where xxx_id and xxx_raddr are of type string.

I''d like the above to produce the output on single line:

0x7FFA403D13DF... A:...


v.

Hey Vladimir,

Is it somehow possible to use tracemem() (or anything else which is able
to
> print array of uchar_t''s or string) to print stream of bytes in
hexadecimal
> on single line ?
>
> I''d like to do something like this:
>
>        printf("0x");
>        tracemem(this->oinfo.xxx_id, 32);
>        printf("A:%-15s ... \n",
>            this->oinfo.xxx_raddr,
>            ...
>
> where xxx_id and xxx_raddr are of type string.
>
> I''d like the above to produce the output on single line:
>
> 0x7FFA403D13DF... A:...
>
There''s nothing particularly convenient, but you could just print out
your
array by hand: %02x%02x... To simplify it a little, you could cast it to a
uint64_t *:

  printf("%16x%16x", ((uint64_t *)this->oinfo.xxx_id)[0],
((uint64_t
*)this->oinfo.xxx_id)[1]);

I hope that helps.

Adam

-- 
Adam Leventhal, Delphix
http://dtrace.org/blogs/ahl

275 Middlefield Road, Suite 50
Menlo Park, CA 94025
http://www.delphix.com
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On 04/13/11 06:18 PM, Adam Leventhal wrote:

<snip>
> There''s nothing particularly convenient, but you could just print
out
> your array by hand: %02x%02x... To simplify it a little, you could cast
> it to a uint64_t *:
>
>    printf("%16x%16x", ((uint64_t *)this->oinfo.xxx_id)[0],
((uint64_t
> *)this->oinfo.xxx_id)[1]);
>
> I hope that helps.
Yes, this should do it for my case. Thanks.

But I also wonder what would you say about e.g. adding new pragma/option 
to change the behavior of tracemem().


v.

> But I also wonder what would you say about e.g. adding new pragma/option to
> change the behavior of tracemem().
... or a printf() format character that does what you want.

Sounds reasonable.

Adam

-- 
Adam Leventhal, Delphix
http://dtrace.org/blogs/ahl

275 Middlefield Road, Suite 50
Menlo Park, CA 94025
http://www.delphix.com