Freebsd:
If the number ends with a ``b'', ``k'', ``m'', ``g'',
or ``w'', the number is multiplied by 512, 1024 (1K), 1048576 (1M),
1073741824 (1G) or the number of bytes in an integer, respectively.
NetBSD:
Where sizes are specified, a decimal number of bytes is expected. Two or
more numbers may be separated by an ``x'' to indicate a product. Each
number may have one of the following optional suffixes:
b Block; multiply by 512
k Kibi; multiply by 1024 (1 KiB)
m Mebi; multiply by 1048576 (1 MiB)
g Gibi; multiply by 1073741824 (1 GiB)
t Tebi; multiply by 1099511627776 (1 TiB)
w Word; multiply by the number of bytes in an integer
On Sun, Mar 23, 2014 at 9:01 PM, Adam Thompson <[email protected]> wrote:
> GNU dd definitely has it (along with the wholly-expected proliferation of
> other useless units). It's definitely not called for by POSIX. IIRC,
> Solaris supports some units but not others. HPUX doesn't support any units
> at all. Don't know what other BSDs or AIX support.
> -Adam
>
> On March 23, 2014 6:20:29 PM CDT, Theo de Raadt <[email protected]>
> wrote:
>>Fine with me.
>>
>>dd is often used in portable scripts. Do we need to document this
>>as an extension, or has it already arrived in other implimentations?
>>
>>> A gigabyte is like a megabyte, except it's bigger and better.
>>>
>>> This adds support for g/G suffixes. It also updates and corrects the
>>> comments in the source. Also move the goto label out of the if.
>>>
>>> Index: args.c
>>> ===================================================================
>>> RCS file: /cvs/src/bin/dd/args.c,v
>>> retrieving revision 1.22
>>> diff -u -p -r1.22 args.c
>>> --- args.c 12 Feb 2014 01:18:36 -0000 1.22
>>> +++ args.c 23 Mar 2014 22:16:58 -0000
>>> @@ -312,13 +312,12 @@ f_conv(char *arg)
>>>
>>> /*
>>> * Convert an expression of the following forms to a size_t
>>> - * 1) A positive decimal number.
>>> - * 2) A positive decimal number followed by a b (mult by 512).
>>> - * 3) A positive decimal number followed by a k (mult by 1024).
>>> - * 4) A positive decimal number followed by a m (mult by 1048576).
>>> - * 5) A positive decimal number followed by a w (mult by sizeof int)
>>> - * 6) Two or more positive decimal numbers (with/without k,b or w).
>>> - * separated by x (also * for backwards compatibility),
>>specifying
>>> + * 1) A positive decimal number, optionally followed by
>>> + * b - multiply by 512.
>>> + * k, m or g - multply by 1024 each.
>>> + * w - multiply by sizeof int
>>> + * 2) Two or more of the above, separated by x
>>> + * (or * for backwards compatibility), specifying
>>> * the product of the indicated values.
>>> */
>>> static size_t
>>> @@ -341,18 +340,24 @@ get_bsz(char *val)
>>> goto erange;
>>> ++expr;
>>> break;
>>> - case 'k':
>>> - case 'K':
>>> + case 'g':
>>> + case 'G':
>>> t = num;
>>> num *= 1024;
>>> if (t > num)
>>> goto erange;
>>> - ++expr;
>>> - break;
>>> + /* fallthrough */
>>> case 'm':
>>> case 'M':
>>> t = num;
>>> - num *= 1048576;
>>> + num *= 1024;
>>> + if (t > num)
>>> + goto erange;
>>> + /* fallthrough */
>>> + case 'k':
>>> + case 'K':
>>> + t = num;
>>> + num *= 1024;
>>> if (t > num)
>>> goto erange;
>>> ++expr;
>>> @@ -374,23 +379,24 @@ get_bsz(char *val)
>>> t = num;
>>> num *= get_bsz(expr + 1);
>>> if (t > num)
>>> -erange: errx(1, "%s: %s", oper,
>>> strerror(ERANGE));
>>> + goto erange;
>>> break;
>>> default:
>>> errx(1, "%s: illegal numeric value", oper);
>>> }
>>> return (num);
>>> +erange:
>>> + errx(1, "%s: %s", oper, strerror(ERANGE));
>>> }
>>>
>>> /*
>>> * Convert an expression of the following forms to an off_t
>>> - * 1) A positive decimal number.
>>> - * 2) A positive decimal number followed by a b (mult by 512).
>>> - * 3) A positive decimal number followed by a k (mult by 1024).
>>> - * 4) A positive decimal number followed by a m (mult by 1048576).
>>> - * 5) A positive decimal number followed by a w (mult by sizeof int)
>>> - * 6) Two or more positive decimal numbers (with/without k,b or w).
>>> - * separated by x (also * for backwards compatibility),
>>specifying
>>> + * 1) A positive decimal number, optionally followed by
>>> + * b - multiply by 512.
>>> + * k, m or g - multply by 1024 each.
>>> + * w - multiply by sizeof int
>>> + * 2) Two or more of the above, separated by x
>>> + * (or * for backwards compatibility), specifying
>>> * the product of the indicated values.
>>> */
>>> static off_t
>>> @@ -413,18 +419,24 @@ get_off(char *val)
>>> goto erange;
>>> ++expr;
>>> break;
>>> - case 'k':
>>> - case 'K':
>>> + case 'g':
>>> + case 'G':
>>> t = num;
>>> num *= 1024;
>>> if (t > num)
>>> goto erange;
>>> - ++expr;
>>> - break;
>>> + /* fallthrough */
>>> case 'm':
>>> case 'M':
>>> t = num;
>>> - num *= 1048576;
>>> + num *= 1024;
>>> + if (t > num)
>>> + goto erange;
>>> + /* fallthrough */
>>> + case 'k':
>>> + case 'K':
>>> + t = num;
>>> + num *= 1024;
>>> if (t > num)
>>> goto erange;
>>> ++expr;
>>> @@ -446,10 +458,12 @@ get_off(char *val)
>>> t = num;
>>> num *= get_off(expr + 1);
>>> if (t > num)
>>> -erange: errx(1, "%s: %s", oper,
>>> strerror(ERANGE));
>>> + goto erange;
>>> break;
>>> default:
>>> errx(1, "%s: illegal numeric value", oper);
>>> }
>>> return (num);
>>> +erange:
>>> + errx(1, "%s: %s", oper, strerror(ERANGE));
>>> }
>>> Index: dd.1
>>> ===================================================================
>>> RCS file: /cvs/src/bin/dd/dd.1,v
>>> retrieving revision 1.29
>>> diff -u -p -r1.29 dd.1
>>> --- dd.1 14 Feb 2014 17:27:58 -0000 1.29
>>> +++ dd.1 23 Mar 2014 22:18:41 -0000
>>> @@ -305,11 +305,13 @@ or
>>> .Sq m
>>> or
>>> .Sq M ,
>>> +.Sq g
>>> +or
>>> +.Sq G ,
>>> or
>>> .Sq w ,
>>> -the number
>>> -is multiplied by 512, 1024 (1K), 1048576 (1M), or the number of
>>bytes
>>> -in an integer, respectively.
>>> +the number is multiplied by 512, 1024 (1K), 1048576 (1M), 1073741824
>>(1G),
>>> +or the number of bytes in an integer, respectively.
>>> Two or more numbers may be separated by an
>>> .Sq x
>>> to indicate a product.
>>>
>
> --
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
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