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#!/usr/bin/env perl
use warnings;
use strict;
use constant BUFFER_SIZE => 40;
binmode(STDIN);
binmode(STDOUT);
exit(1) if ($#ARGV != 0);
my $indent = $ARGV[0];
my $print_indent = 1;
my $buffer;
my $size;
my $c;
while (1) {
$size = sysread(STDIN, $buffer, BUFFER_SIZE);
last if ($size < 1);
for (0..$size-1) {
$c = substr($buffer, $_, 1);
if ($c eq "\n") {
syswrite(STDOUT, $indent) if ($print_indent);
syswrite(STDOUT, $c, 1);
$print_indent = 1;
} elsif ($c eq "\r") {
syswrite(STDOUT, $c, 1);
$print_indent = 1;
} else {
syswrite(STDOUT, $indent) if ($print_indent);
syswrite(STDOUT, $c, 1);
$print_indent = 0;
}
}
}
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