feature request/source changes

[Wyman Miles]

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I frequently find myself sorting individual partition images out of 
captures of full disk images using dd.  I prefer dd over a purpose-designed 
forensics imaging tool because its operation is well documented, well 
understood, and the image files thus captured are valuable to other 
security engineers without the need for proprietary software.

To simplify my work, I've added "start=BLOCK" and "end=BLOCK" commands to 
dd so I can provide those values directly, rather than "skip=" and "count="

Below is a diff.  The changes are rather minor.  Any chance this can make 
it into the next rev of coreutils?

156,161d155
< /* begin copying at this block number */
< static uintmax_t start_record = 0;
<
< /* end copying at this block number */
< static uintmax_t end_record = 0;
<
429,430d422
<   start=BLOCK   start processing input at BLOCK\n\
<   end=BLOCK     stop processing input at BLOCK\n\
930,933d921
<         else if (STREQ (name, "start"))
<               start_record = n;
<         else if (STREQ (name, "end"))
<                 end_record = n;
946,955d933
<   /* deal with "start" and "end" by computing those into "skip" and 
"count"
<    * */
<   if (start_record) {
<         skip_records = start_record;
<         if (end_record) {
<                 /* count = (end_record - start_record) + 1 */
<                 max_records = (end_record - start_record) + 1;
<         }
<   }
<


Wyman Miles
Senior Security Engineer
Cornell University, Ithaca, NY
(607) 255-8421
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