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converter's scratchpad

by converter (Priest)
on Jun 02, 2004 at 03:29 UTC ( #359104=scratchpad: print w/replies, xml ) Need Help??

#!/usr/bin/perl use warnings; use strict; # given skew factor and sectors/track, # return a list of skewed sector numbers. # skew: skew factor # sectors: number of sectors (per track) sub skewlist { my ($skew, $sectors) = @_; my @a = 1; my %seen = (1 => 1); for (2..$sectors) { my $s = $a[-1] + $skew; $s = $skew - ($sectors - $a[-1]) if $s > $sectors; $s++ while $seen{$s}; $seen{$s}++; push @a, $s; } return @a; } sub main { unless (2 == @ARGV) { die "usage: skewgen <skew factor> <number of sectors>"; } my @a = skewlist(@ARGV); print "skewlist: @a\n"; } exit(main()); __END__ $ ./skewgen 4 15 skewlist: 1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 $ ./skewgen 6 26 skewlist: 1 7 13 19 25 5 11 17 23 3 9 15 21 2 8 14 20 26 6 12 18 24 4 +10 16 22
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