zerofile

来自「geekos 0.3.0简单的操作系统」· 代码 · 共 32 行

#! /usr/bin/perl

# This script is used for creating a file full of zeroes,
# which we use to create the hard disk image used by bochs.

use strict qw(refs vars);
use FileHandle;
use IO::Seekable;

if ( scalar(@ARGV) != 2 ) {
    print "Usage: zerofile <output file> <num sectors>\n";
    exit 1;
}

my $outfile = shift @ARGV;
my $numsecs = shift @ARGV;

my $buf = chr(0) x 1;

my $fh = new FileHandle(">$outfile");
(defined $fh) || die "Couldn't open $outfile: $!\n";
binmode $fh;

if ( !sysseek( $fh, ($numsecs * 512) - 1, SEEK_SET ) ) {
    die "Couldn't seek in $outfile: $!\n";
}
if ( !syswrite( $fh, $buf, 1 ) ) {
    die "Couldn't write to $outfile: $!\n";
}

$fh->close();