/usr/share/perl5/Log/Agent/Prefixer.pm is in liblog-agent-perl 1.001-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Prefixer.pm
#
# Copyright (C) 1999 Raphael Manfredi.
# Copyright (C) 2002-2015 Mark Rogaski, mrogaski@cpan.org;
# all rights reserved.
#
# See the README file included with the
# distribution for license information.
#
##########################################################################
use strict;
########################################################################
package Log::Agent::Prefixer;
#
# Ancestor for logging channels wishing to implement native prefixing
#
#
# Attribute access: those attributes must be filled by our heirs
#
sub prefix { $_[0]->{'prefix'} }
sub stampfmt { $_[0]->{'stampfmt'} }
sub showpid { $_[0]->{'showpid'} }
sub no_ucfirst { $_[0]->{'no_ucfirst'} }
sub no_prefixing { $_[0]->{'no_prefixing'} }
sub no_newline { $_[0]->{'no_newline'} }
sub crlf { $_[0]->{'crlf'} }
#
# ->prefixing_string
#
# Compute prefixing string: stamping and "prefix: " to be emitted before
# the logged string.
#
# Usage:
#
# $str = $self->prefixing_string(); # no ucfirst support possible
# $str = $self->prefixing_string(\$log_message);
#
# Leading char of to-be-logged string is upper-cased in-place if
# neither prefix nor pid are present, and behaviour was not disabled
# via a -no_ucfirst, and the second call form with a scalar ref is used.
#
sub prefixing_string {
my $self = shift;
#
# This routine is called often...
# Bypass the attribute access routines.
#
my $prefix = $self->{prefix};
$prefix = '' unless defined $prefix;
if ($self->{showpid}) {
if ($prefix eq '') {
$prefix = $$;
} else {
$prefix .= "[$$]";
}
} elsif ($prefix eq '') {
my $rstr = $_[0];
$$rstr =~ s/^(.)/\u$1/ if ref $rstr && !$self->{no_ucfirst};
}
my $stamp = &{$self->{stampfmt}};
return
($stamp eq '' ? '' : "$stamp ") .
($prefix eq '' ? '' : "$prefix: ");
}
1; # for require
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