diff options
-rw-r--r-- | utils/mkdiskimage.in | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/utils/mkdiskimage.in b/utils/mkdiskimage.in index 9231fa21..533193a1 100644 --- a/utils/mkdiskimage.in +++ b/utils/mkdiskimage.in @@ -2,7 +2,7 @@ ## ----------------------------------------------------------------------- ## ## Copyright 2002-2008 H. Peter Anvin - All Rights Reserved -## Copyright 2009 Intel Corporation; author: H. Peter Anvin +## Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin ## ## This program is free software; you can redistribute it and/or modify ## it under the terms of the GNU General Public License as published by @@ -144,6 +144,7 @@ if ( $file eq '' || $c < 1 || $h < 1 || $h > 256 || $s < 1 || $s > 63 ) { print STDERR " -z use zipdisk geometry (h=64 s=32)\n"; print STDERR " -4 use partition entry 4 (standard for zipdisks)\n"; print STDERR " -i specify the MBR ID\n"; + print STDERR " -s output a sparse file (don't allocate all blocks)\n"; exit 1; } @@ -216,13 +217,16 @@ print OUTPUT "\x55\xaa"; $totalsize = $c*$h*$s; $tracks = $c*$h; -$track = "\0" x (512*$s); +# If -s is given, try to simply use truncate... +unless ($opt{'s'} && truncate(OUTPUT, $totalsize)) { + $track = "\0" x (512*$s); -# Print fractional track -print OUTPUT "\0" x (512 * ($s-1)); + # Print fractional track + print OUTPUT "\0" x (512 * ($s-1)); -for ( $i = 1 ; $i < $tracks ; $i++ ) { - print OUTPUT $track; + for ( $i = 1 ; $i < $tracks ; $i++ ) { + print OUTPUT $track; + } } # Print mtools temp file |