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.
