sdx mksplit on 64bit platforms

sdx mksplit and similar commands don't work under linux/amd64. The error reported is "this code needs to be finished..."

I've found the problem. The code

  if {[format %x [expr $a] eq "80000000"} {
    set start [expr {$end - 16 - $b}]
  } else {
    # if the file is in commit-progress state, we need to do more
    fail "this code needs to be finished..."
  }

fails under 64 bit platforms since the value to read from file is "0x80000000" and it is sign-extended to 64 bits and becomes "0xffffffff80000000". This line ("0xffffffff80000000") is generated by format and comparison fails.

I've fixed the problem by changing the first line of code to

if {[format %x [expr {$a & 0xffffffff}] eq "80000000"} {

and it worked. The files to be fixed are: mksplit.tcl mkinfo.tcl mkpack.tcl wrap.tcl .