fix backgrounding of mrtg

[spider.git] / perl / DXUtil.pm

#
# various utilities which are exported globally
#
# Copyright (c) 1998 - Dirk Koopman G1TLH
#
#
#

package DXUtil;


use Date::Parse;
use IO::File;
use File::Copy;
use Data::Dumper;


use strict;

use vars qw(@month %patmap $pi $d2r $r2d @ISA @EXPORT);

require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(atime ztime cldate cldatetime slat slong yesno promptf 
                         parray parraypairs phex phash shellregex readfilestr writefilestr
                         filecopy ptimelist
             print_all_fields cltounix unpad is_callsign is_long_callsign is_latlong
                         is_qra is_freq is_digits is_pctext is_pcflag insertitem deleteitem
                         is_prefix dd is_ipaddr $pi $d2r $r2d localdata localdata_mv
            );


@month = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
%patmap = (
                   '*' => '.*',
                   '?' => '.',
                   '[' => '[',
                   ']' => ']'
);

$pi = 3.141592653589;
$d2r = ($pi/180);
$r2d = (180/$pi);


# a full time for logging and other purposes
sub atime
{
        my $t = shift;
        my ($sec,$min,$hour,$mday,$mon,$year) = gmtime((defined $t) ? $t : time);
        $year += 1900;
        my $buf = sprintf "%02d%s%04d\@%02d:%02d:%02d", $mday, $month[$mon], $year, $hour, $min, $sec;
        return $buf;
}

# get a zulu time in cluster format (2300Z)
sub ztime
{
        my $t = shift;
        $t = defined $t ? $t : time;
        my $dst = shift;
        my ($sec,$min,$hour) = $dst ? localtime($t): gmtime($t);
        my $buf = sprintf "%02d%02d%s", $hour, $min, ($dst) ? '' : 'Z';
        return $buf;
}

# get a cluster format date (23-Jun-1998)
sub cldate
{
        my $t = shift;
        $t = defined $t ? $t : time;
        my $dst = shift;
        my ($sec,$min,$hour,$mday,$mon,$year) = $dst ? localtime($t) : gmtime($t);
        $year += 1900;
        my $buf = sprintf "%2d-%s-%04d", $mday, $month[$mon], $year;
        return $buf;
}

# return a cluster style date time
sub cldatetime
{
        my $t = shift;
        my $dst = shift;
        my $date = cldate($t, $dst);
        my $time = ztime($t, $dst);
        return "$date $time";
}

# return a unix date from a cluster date and time
sub cltounix
{
        my $date = shift;
        my $time = shift;
        my ($thisyear) = (gmtime)[5] + 1900;

        return 0 unless $date =~ /^\s*(\d+)-(\w\w\w)-([12][90]\d\d)$/;
        return 0 if $3 > 2036;
        return 0 unless abs($thisyear-$3) <= 1;
        $date = "$1 $2 $3";
        return 0 unless $time =~ /^([012]\d)([012345]\d)Z$/;
        $time = "$1:$2 +0000";
        my $r = str2time("$date $time");
        return $r unless $r;
        return $r == -1 ? undef : $r;
}

# turn a latitude in degrees into a string
sub slat
{
        my $n = shift;
        my ($deg, $min, $let);
        $let = $n >= 0 ? 'N' : 'S';
        $n = abs $n;
        $deg = int $n;
        $min = int ((($n - $deg) * 60) + 0.5);
        return "$deg $min $let";
}

# turn a longitude in degrees into a string
sub slong
{
        my $n = shift;
        my ($deg, $min, $let);
        $let = $n >= 0 ? 'E' : 'W';
        $n = abs $n;
        $deg = int $n;
        $min = int ((($n - $deg) * 60) + 0.5);
        return "$deg $min $let";
}

# turn a true into 'yes' and false into 'no'
sub yesno
{
        my $n = shift;
        return $n ? $main::yes : $main::no;
}

# provide a data dumpered version of the object passed
sub dd
{
        my $value = shift;
        my $dd = new Data::Dumper([$value]);
        $dd->Indent(0);
        $dd->Terse(1);
    $dd->Quotekeys($] < 5.005 ? 1 : 0);
        $value = $dd->Dumpxs;
        $value =~ s/([\r\n\t])/sprintf("%%%02X", ord($1))/eg;
        $value =~ s/^\s*\[//;
    $value =~ s/\]\s*$//;
        
        return $value;
}

# format a prompt with its current value and return it with its privilege
sub promptf
{
        my ($line, $value) = @_;
        my ($priv, $prompt, $action) = split ',', $line;

        # if there is an action treat it as a subroutine and replace $value
        if ($action) {
                my $q = qq{\$value = $action(\$value)};
                eval $q;
        } elsif (ref $value) {
                $value = dd($value);
        }
        $prompt = sprintf "%15s: %s", $prompt, $value;
        return ($priv, $prompt);
}

# turn a hex field into printed hex
sub phex
{
        my $val = shift;
        return sprintf '%X', $val;
}

# take an arg as a hash of call=>time pairs and print it
sub ptimelist
{
        my $ref = shift;
        my $out;
        for (sort keys %$ref) {
                $out .= "$_=$ref->{$_}, ";
        }
        chop $out;
        chop $out;
        return $out;    
}

# take an arg as an array list and print it
sub parray
{
        my $ref = shift;
        return ref $ref ? join(', ', @{$ref}) : $ref;
}

# take the arg as an array reference and print as a list of pairs
sub parraypairs
{
        my $ref = shift;
        my $i;
        my $out;

        for ($i = 0; $i < @$ref; $i += 2) {
                my $r1 = @$ref[$i];
                my $r2 = @$ref[$i+1];
                $out .= "$r1-$r2, ";
        }
        chop $out;                                      # remove last space
        chop $out;                                      # remove last comma
        return $out;
}

# take the arg as a hash reference and print it out as such
sub phash
{
        my $ref = shift;
        my $out;

        while (my ($k,$v) = each %$ref) {
                $out .= "${k}=>$v, ";
        }
        chop $out;                                      # remove last space
        chop $out;                                      # remove last comma
        return $out;
}

sub _sort_fields
{
        my $ref = shift;
        my @a = split /,/, $ref->field_prompt(shift); 
        my @b = split /,/, $ref->field_prompt(shift); 
        return lc $a[1] cmp lc $b[1];
}

# print all the fields for a record according to privilege
#
# The prompt record is of the format '<priv>,<prompt>[,<action>'
# and is expanded by promptf above
#
sub print_all_fields
{
        my $self = shift;                       # is a dxchan
        my $ref = shift;                        # is a thingy with field_prompt and fields methods defined
        my @out;
        my @fields = $ref->fields;
        my $field;
        my $width = $self->width - 1;
        $width ||= 80;

        foreach $field (sort {_sort_fields($ref, $a, $b)} @fields) {
                if (defined $ref->{$field}) {
                        my ($priv, $ans) = promptf($ref->field_prompt($field), $ref->{$field});
                        my @tmp;
                        if (length $ans > $width) {
                                my ($p, $a) = split /: /, $ans, 2;
                                my $l = (length $p) + 2;
                                my $al = ($width - 1) - $l;
                                my $bit;
                                while (length $a > $al ) {
                                        ($bit, $a) = unpack "A$al A*", $a;
                                        push @tmp, "$p: $bit";
                                        $p = ' ' x ($l - 2);
                                }
                                push @tmp, "$p: $a" if length $a;
                        } else {
                                push @tmp, $ans;
                        }
                        push @out, @tmp if ($self->priv >= $priv);
                }
        }
        return @out;
}

# generate a regex from a shell type expression 
# see 'perl cookbook' 6.9
sub shellregex
{
        my $in = shift;
        $in =~ s{(.)} { $patmap{$1} || "\Q$1" }ge;
        return '^' . $in . "\$";
}

# read in a file into a string and return it. 
# the filename can be split into a dir and file and the 
# file can be in upper or lower case.
# there can also be a suffix
sub readfilestr
{
        my ($dir, $file, $suffix) = @_;
        my $fn;
        my $f;
        if ($suffix) {
                $f = uc $file;
                $fn = "$dir/$f.$suffix";
                unless (-e $fn) {
                        $f = lc $file;
                        $fn = "$dir/$file.$suffix";
                }
        } elsif ($file) {
                $f = uc $file;
                $fn = "$dir/$file";
                unless (-e $fn) {
                        $f = lc $file;
                        $fn = "$dir/$file";
                }
        } else {
                $fn = $dir;
        }

        my $fh = new IO::File $fn;
        my $s = undef;
        if ($fh) {
                local $/ = undef;
                $s = <$fh>;
                $fh->close;
        }
        return $s;
}

# write out a file in the format required for reading
# in via readfilestr, it expects the same arguments 
# and a reference to an object
sub writefilestr
{
        my $dir = shift;
        my $file = shift;
        my $suffix = shift;
        my $obj = shift;
        my $fn;
        my $f;
        
        confess('no object to write in writefilestr') unless $obj;
        confess('object not a reference in writefilestr') unless ref $obj;
        
        if ($suffix) {
                $f = uc $file;
                $fn = "$dir/$f.$suffix";
                unless (-e $fn) {
                        $f = lc $file;
                        $fn = "$dir/$file.$suffix";
                }
        } elsif ($file) {
                $f = uc $file;
                $fn = "$dir/$file";
                unless (-e $fn) {
                        $f = lc $file;
                        $fn = "$dir/$file";
                }
        } else {
                $fn = $dir;
        }

        my $fh = new IO::File ">$fn";
        if ($fh) {
                my $dd = new Data::Dumper([ $obj ]);
                $dd->Indent(1);
                $dd->Terse(1);
                $dd->Quotekeys(0);
                #       $fh->print(@_) if @_ > 0;     # any header comments, lines etc
                $fh->print($dd->Dumpxs);
                $fh->close;
        }
}

sub filecopy
{
        copy(@_) or return $!;
}

# remove leading and trailing spaces from an input string
sub unpad
{
        my $s = shift;
        $s =~ s/\s+$//;
        $s =~ s/^\s+//;
        return $s;
}

# check that a field only has callsign characters in it
sub is_callsign
{
        return $_[0] =~ m!^(?:[A-Z]{1,2}\d+ | \d[A-Z]{1,2}\d+)        # basic prefix
                       (?:/(?:[A-Z]{1,2}\d+ | \d[A-Z]{1,2}\d+))?  # / another one (possibly)
                                           [A-Z]{1,4}                                 # callsign letters
                                           (?:/(?:[A-Z]{1,2}\d+ | \d[A-Z]{1,2}\d+))?  # / another prefix possibly
                       (?:/[0-9A-Z]{1,2})?                        # /0-9A-Z+ possibly
                                           (?:-\d{1,2})?                              # - nn possibly
                                         $!x;
}

# check that a field only has callsign characters in it but has more than the standard 3 callsign letters
sub is_long_callsign
{
        return $_[0] =~ m!^(?:[A-Z]{1,2}\d+ | \d[A-Z]{1,2}\d+)        # basic prefix
                       (?:/(?:[A-Z]{1,2}\d+ | \d[A-Z]{1,2}\d+))?  # / another one (possibly)
                                           [A-Z]{1,5}                                 # callsign letters
                                           (?:/(?:[A-Z]{1,2}\d+ | \d[A-Z]{1,2}\d+))?  # / another prefix possibly
                       (?:/[0-9A-Z]{1,2})?                        # /0-9A-Z+ possibly
                                           (?:-\d{1,2})?                              # - nn possibly
                                         $!x;
}

sub is_prefix
{
        return $_[0] =~ m!^(?:[A-Z]{1,2}\d+ | \d[A-Z]{1,2}\d+)!x        # basic prefix
}
        

# check that a PC protocol field is valid text
sub is_pctext
{
        return undef unless length $_[0];
        return undef if $_[0] =~ /[\x00-\x08\x0a-\x1f\x80-\x9f]/;
        return 1;
}

# check that a PC prot flag is fairly valid (doesn't check the difference between 1/0 and */-)
sub is_pcflag
{
        return $_[0] =~ /^[01\*\-]+$/;
}

# check that a thing is a frequency
sub is_freq
{
        return $_[0] =~ /^\d+(?:\.\d+)?$/;
}

# check that a thing is just digits
sub is_digits
{
        return $_[0] =~ /^[\d]+$/;
}

# does it look like a qra locator?
sub is_qra
{
        return $_[0] =~ /^[A-Ra-r][A-Ra-r]\d\d[A-Xa-x][A-Xa-x]$/;
}

# does it look like a valid lat/long
sub is_latlong
{
        return $_[0] =~ /^\s*\d{1,2}\s+\d{1,2}\s*[NnSs]\s+1?\d{1,2}\s+\d{1,2}\s*[EeWw]\s*$/;
}

# is it an ip address?
sub is_ipaddr
{
    return $_[0] =~ /^\d+\.\d+\.\d+\.\d+$/ || $_[0] =~ /^[0-9a-f:]+$/;
}

# insert an item into a list if it isn't already there returns 1 if there 0 if not
sub insertitem
{
        my $list = shift;
        my $item = shift;
        
        return 1 if grep {$_ eq $item } @$list;
        push @$list, $item;
        return 0;
}

# delete an item from a list if it is there returns no deleted 
sub deleteitem
{
        my $list = shift;
        my $item = shift;
        my $n = @$list;
        
        @$list = grep {$_ ne $item } @$list;
        return $n - @$list;
}

# find the correct local_data directory
# basically, if there is a local_data directory with this filename and it is younger than the
# equivalent one in the (system) data directory then return that name rather than the system one
sub localdata
{
        my $ifn = shift;
        my $ofn = "$main::data/$ifn";
        my $tfn;
        
        if (-e "$main::local_data") {
                $tfn = "$main::local_data/$ifn";
                if (-e $tfn && -e $ofn) {
                        $ofn = $tfn if -M $tfn < -M $ofn;
                } elsif (-e $tfn) {
                        $ofn = $tfn;
                }
        }

        return $ofn;
}

# move a file or a directory from data -> local_data if isn't there already
sub localdata_mv
{
        my $ifn = shift;
        if (-e "$main::data/$ifn" ) {
                unless (-e "$main::local_data/$ifn") {
                        move("$main::data/$ifn", "$main::local_data/$ifn") or die "localdata_mv: cannot move $ifn from '$main::data' -> '$main::local_data' $!\n";
                }
        }
}