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cat: add raw mode #638

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merged 1 commit into from
Jun 4, 2024
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cat: add raw mode #638

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46 changes: 32 additions & 14 deletions bin/cat
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Original file line number Diff line number Diff line change
Expand Up @@ -22,20 +22,24 @@ use constant EX_FAILURE => 1;
our $VERSION = '1.3';
my $Program = basename($0);

getopts('benstuv', \my %options) or do {
my %opt;
getopts('benstuv', \%opt) or do {
warn "usage: $Program [-benstuv] [file ...]\n";
exit EX_FAILURE;
};

my $ends = exists $options{'e'};
my $tabs = exists $options{'t'};
my $nonprinting = exists $options{'v'} || $ends || $tabs;
my $squeeze_empty = exists $options{'s'};
my $number_lines = $options{'n'} && !$options{'b'};
my $number_non_blanks = exists $options{'b'};
my $ends = $opt{'e'};
my $tabs = $opt{'t'};
my $nonprinting = $opt{'v'} || $ends || $tabs;
my $squeeze_empty = $opt{'s'};
my $number_lines = $opt{'n'} && !$opt{'b'};
my $number_non_blanks = $opt{'b'};

my $cook = grep {$_ || ()} @opt{'b', 'e', 'n', 's', 't', 'v'};
my $cat = $cook ? \&cook_file : \&raw_file;

# Unbuffer output for -u.
$| = exists $options{'u'};
$| = 1 if $opt{'u'};

my $was_empty = 0;
my $count = 0;
Expand Down Expand Up @@ -70,9 +74,28 @@ sub do_file {
return 1;
}
}
$cat->($fh);

while (<$fh>) {
if ($name ne '-' && !close($fh)) {
warn "$Program: failed to close '$name': $!\n";
return 1;
}
return 0;
}

sub raw_file {
my $fh = shift;
my $BUFSZ = 8192;
my $buf;
while (read $fh, $buf, $BUFSZ) {
print $buf;
}
}

sub cook_file {
my $fh = shift;

while (<$fh>) {
if ($squeeze_empty) {
my $is_empty = /^$/;
if ($is_empty && $was_empty) {
Expand All @@ -96,11 +119,6 @@ sub do_file {
}
print;
}
if ($name ne '-' && !close($fh)) {
warn "$Program: failed to close '$name': $!\n";
return 1;
}
return 0;
}

__END__
Expand Down