745 lines
18 KiB
Perl
745 lines
18 KiB
Perl
package Term::Cap;
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# Since the debugger uses Term::ReadLine which uses Term::Cap, we want
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# to load as few modules as possible. This includes Carp.pm.
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sub carp
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{
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require Carp;
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goto &Carp::carp;
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}
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sub croak
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{
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require Carp;
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goto &Carp::croak;
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}
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use strict;
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use vars qw($VERSION $VMS_TERMCAP);
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$VERSION = '1.18';
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# TODO:
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# support Berkeley DB termcaps
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# force $FH into callers package?
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# keep $FH in object at Tgetent time?
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=head1 NAME
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Term::Cap - Perl termcap interface
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=head1 SYNOPSIS
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require Term::Cap;
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$terminal = Term::Cap->Tgetent({ TERM => undef, OSPEED => $ospeed });
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$terminal->Trequire(qw/ce ku kd/);
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$terminal->Tgoto('cm', $col, $row, $FH);
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$terminal->Tputs('dl', $count, $FH);
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$terminal->Tpad($string, $count, $FH);
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=head1 DESCRIPTION
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These are low-level functions to extract and use capabilities from
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a terminal capability (termcap) database.
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More information on the terminal capabilities will be found in the
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termcap manpage on most Unix-like systems.
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=head2 METHODS
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The output strings for B<Tputs> are cached for counts of 1 for performance.
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B<Tgoto> and B<Tpad> do not cache. C<$self-E<gt>{_xx}> is the raw termcap
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data and C<$self-E<gt>{xx}> is the cached version.
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print $terminal->Tpad($self->{_xx}, 1);
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B<Tgoto>, B<Tputs>, and B<Tpad> return the string and will also
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output the string to $FH if specified.
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=cut
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# Preload the default VMS termcap.
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# If a different termcap is required then the text of one can be supplied
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# in $Term::Cap::VMS_TERMCAP before Tgetent is called.
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if ( $^O eq 'VMS' )
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{
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chomp( my @entry = <DATA> );
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$VMS_TERMCAP = join '', @entry;
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}
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# Returns a list of termcap files to check.
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sub termcap_path
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{ ## private
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my @termcap_path;
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# $TERMCAP, if it's a filespec
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push( @termcap_path, $ENV{TERMCAP} )
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if (
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( exists $ENV{TERMCAP} )
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&& (
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( $^O eq 'os2' || $^O eq 'MSWin32' || $^O eq 'dos' )
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? $ENV{TERMCAP} =~ /^[a-z]:[\\\/]/is
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: $ENV{TERMCAP} =~ /^\//s
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)
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);
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if ( ( exists $ENV{TERMPATH} ) && ( $ENV{TERMPATH} ) )
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{
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# Add the users $TERMPATH
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push( @termcap_path, split( /:|\s+/, $ENV{TERMPATH} ) );
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}
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else
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{
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# Defaults
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push( @termcap_path,
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exists $ENV{'HOME'} ? $ENV{'HOME'} . '/.termcap' : undef,
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'/etc/termcap', '/usr/share/misc/termcap', );
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}
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# return the list of those termcaps that exist
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return grep { defined $_ && -f $_ } @termcap_path;
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}
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=over 4
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=item B<Tgetent>
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Returns a blessed object reference which the user can
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then use to send the control strings to the terminal using B<Tputs>
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and B<Tgoto>.
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The function extracts the entry of the specified terminal
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type I<TERM> (defaults to the environment variable I<TERM>) from the
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database.
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It will look in the environment for a I<TERMCAP> variable. If
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found, and the value does not begin with a slash, and the terminal
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type name is the same as the environment string I<TERM>, the
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I<TERMCAP> string is used instead of reading a termcap file. If
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it does begin with a slash, the string is used as a path name of
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the termcap file to search. If I<TERMCAP> does not begin with a
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slash and name is different from I<TERM>, B<Tgetent> searches the
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files F<$HOME/.termcap>, F</etc/termcap>, and F</usr/share/misc/termcap>,
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in that order, unless the environment variable I<TERMPATH> exists,
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in which case it specifies a list of file pathnames (separated by
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spaces or colons) to be searched B<instead>. Whenever multiple
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files are searched and a tc field occurs in the requested entry,
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the entry it names must be found in the same file or one of the
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succeeding files. If there is a C<:tc=...:> in the I<TERMCAP>
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environment variable string it will continue the search in the
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files as above.
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The extracted termcap entry is available in the object
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as C<$self-E<gt>{TERMCAP}>.
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It takes a hash reference as an argument with two optional keys:
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=over 2
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=item OSPEED
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The terminal output bit rate (often mistakenly called the baud rate)
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for this terminal - if not set a warning will be generated
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and it will be defaulted to 9600. I<OSPEED> can be specified as
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either a POSIX termios/SYSV termio speeds (where 9600 equals 9600) or
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an old DSD-style speed ( where 13 equals 9600).
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=item TERM
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The terminal type whose termcap entry will be used - if not supplied it will
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default to $ENV{TERM}: if that is not set then B<Tgetent> will croak.
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=back
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It calls C<croak> on failure.
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=cut
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sub Tgetent
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{ ## public -- static method
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my $class = shift;
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my ($self) = @_;
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$self = {} unless defined $self;
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bless $self, $class;
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my ( $term, $cap, $search, $field, $tmp_term, $TERMCAP );
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my ( $state, $first, $entry );
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local $_;
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# Compute PADDING factor from OSPEED (to be used by Tpad)
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if ( !$self->{OSPEED} )
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{
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if ($^W)
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{
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carp "OSPEED was not set, defaulting to 9600";
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}
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$self->{OSPEED} = 9600;
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}
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if ( $self->{OSPEED} < 16 )
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{
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# delays for old style speeds
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my @pad = (
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0, 200, 133.3, 90.9, 74.3, 66.7, 50, 33.3,
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16.7, 8.3, 5.5, 4.1, 2, 1, .5, .2
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);
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$self->{PADDING} = $pad[ $self->{OSPEED} ];
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}
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else
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{
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$self->{PADDING} = 10000 / $self->{OSPEED};
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}
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unless ( $self->{TERM} )
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{
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if ( $ENV{TERM} )
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{
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$self->{TERM} = $ENV{TERM} ;
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}
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else
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{
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if ( $^O eq 'MSWin32' )
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{
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$self->{TERM} = 'dumb';
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}
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else
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{
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croak "TERM not set";
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}
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}
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}
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$term = $self->{TERM}; # $term is the term type we are looking for
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# $tmp_term is always the next term (possibly :tc=...:) we are looking for
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$tmp_term = $self->{TERM};
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my $seen = {};
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if (exists $ENV{TERMCAP}) {
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local $_ = $ENV{TERMCAP};
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if ( !m:^/:s && m/(^|\|)\Q$tmp_term\E[:|]/s ) {
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$entry = $_;
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$seen->{$tmp_term} = 1;
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}
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}
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my @termcap_path = termcap_path();
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$state = 1; # 0 == finished
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# 1 == next file
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# 2 == search again
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# 3 == try infocmp
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$first = 0; # first entry (keeps term name)
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if ($entry)
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{
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# ok, we're starting with $TERMCAP
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$first++; # we're the first entry
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# do we need to continue?
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if ( $entry =~ s/:tc=([^:]+):/:/ )
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{
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$tmp_term = $1;
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}
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else
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{
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$state = 0; # we're already finished
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}
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}
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while ( $state != 0 )
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{
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if ( $state == 1 ) {
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# get the next TERMCAP
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$TERMCAP = shift @termcap_path or $state = 3;
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} elsif ($state == 3) {
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croak "failed termcap lookup on $tmp_term";
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} else {
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# do the same file again
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$state = 1; # ok, maybe do a new file next time
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}
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my ($fh, $child);
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if ($state == 3) {
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# need to do a proper fork, so that we can pass tmp_term
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# without having to quote it.
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$child = open($fh, "-|");
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warn "cannot run infocmp: $!" if !defined $child;
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if (!$child) {
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open(STDERR, ">", "/dev/null");
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exec('infocmp', '-CTrx', '--', $tmp_term);
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exit(1);
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}
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} else {
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open($fh, '<', $TERMCAP) || croak "open $TERMCAP: $!";
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}
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while (<$fh>) {
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next if /^\t/ || /^#/;
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if (m/(^|\|)\Q$tmp_term\E[:|]/) {
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chomp;
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s/^[^:]*:// if $first++;
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$state = 0;
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$seen->{$tmp_term} = 1;
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while (s/\\$//) {
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defined(my $x = <$fh>) or last;
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$_ .= $x; chomp;
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}
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if (defined $entry) {
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$entry .= $_;
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} else {
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$entry = $_;
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}
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last;
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}
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}
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close $fh;
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waitpid($child, 0) if defined $child;
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next if $state != 0;
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# If :tc=...: found then search this file again
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while ($entry =~ s/:tc=([^:]+):/:/) {
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$tmp_term = $1;
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next if $seen->{$tmp_term};
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$state = 2;
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last;
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}
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}
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if ( !defined $entry ) {
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if ( $^O eq 'VMS' ) {
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$entry = $VMS_TERMCAP;
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# this is getting desperate now
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} elsif ( $self->{TERM} eq 'dumb' ){
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$entry = 'dumb|80-column dumb tty::am::co#80::bl=^G:cr=^M:do=^J:sf=^J:';
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}
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}
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croak "Can't find $term" if !defined $entry;
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$entry =~ s/:+\s*:+/:/g; # cleanup $entry
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$entry =~ s/:+/:/g; # cleanup $entry
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$self->{TERMCAP} = $entry; # save it
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# print STDERR "DEBUG: $entry = ", $entry, "\n";
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# Precompile $entry into the object
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$entry =~ s/^[^:]*://;
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foreach $field ( split( /:[\s:\\]*/, $entry ) )
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{
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if ( defined $field && $field =~ /^(\w{2,})$/ )
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{
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$self->{ '_' . $field } = 1 unless defined $self->{ '_' . $1 };
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# print STDERR "DEBUG: flag $1\n";
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}
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elsif ( defined $field && $field =~ /^(\w{2,})\@/ )
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{
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$self->{ '_' . $1 } = "";
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# print STDERR "DEBUG: unset $1\n";
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}
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elsif ( defined $field && $field =~ /^(\w{2,})#(.*)/ )
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{
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$self->{ '_' . $1 } = $2 unless defined $self->{ '_' . $1 };
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# print STDERR "DEBUG: numeric $1 = $2\n";
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}
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elsif ( defined $field && $field =~ /^(\w{2,})=(.*)/ )
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{
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# print STDERR "DEBUG: string $1 = $2\n";
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next if defined $self->{ '_' . ( $cap = $1 ) };
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$_ = $2;
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if ( ord('A') == 193 )
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{
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s/\\E/\047/g;
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s/\\(\d\d\d)/pack('c',oct($1) & 0177)/eg;
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s/\\n/\n/g;
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s/\\r/\r/g;
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s/\\t/\t/g;
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s/\\b/\b/g;
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s/\\f/\f/g;
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s/\\\^/\337/g;
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s/\^\?/\007/g;
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s/\^(.)/pack('c',ord($1) & 31)/eg;
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s/\\(.)/$1/g;
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s/\337/^/g;
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}
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else
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{
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s/\\E/\033/g;
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s/\\(\d\d\d)/pack('c',oct($1) & 0177)/eg;
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s/\\n/\n/g;
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s/\\r/\r/g;
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s/\\t/\t/g;
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s/\\b/\b/g;
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s/\\f/\f/g;
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s/\\\^/\377/g;
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s/\^\?/\177/g;
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s/\^(.)/pack('c',ord($1) & 31)/eg;
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s/\\(.)/$1/g;
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s/\377/^/g;
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}
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$self->{ '_' . $cap } = $_;
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}
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# else { carp "junk in $term ignored: $field"; }
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}
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$self->{'_pc'} = "\0" unless defined $self->{'_pc'};
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$self->{'_bc'} = "\b" unless defined $self->{'_bc'};
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$self;
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}
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# $terminal->Tpad($string, $cnt, $FH);
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=item B<Tpad>
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Outputs a literal string with appropriate padding for the current terminal.
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It takes three arguments:
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=over 2
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=item B<$string>
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The literal string to be output. If it starts with a number and an optional
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'*' then the padding will be increased by an amount relative to this number,
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if the '*' is present then this amount will be multiplied by $cnt. This part
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of $string is removed before output/
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=item B<$cnt>
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Will be used to modify the padding applied to string as described above.
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=item B<$FH>
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An optional filehandle (or IO::Handle ) that output will be printed to.
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=back
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The padded $string is returned.
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=cut
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sub Tpad
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{ ## public
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my $self = shift;
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my ( $string, $cnt, $FH ) = @_;
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my ( $decr, $ms );
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if ( defined $string && $string =~ /(^[\d.]+)(\*?)(.*)$/ )
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{
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$ms = $1;
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$ms *= $cnt if $2;
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$string = $3;
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$decr = $self->{PADDING};
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if ( $decr > .1 )
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{
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$ms += $decr / 2;
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$string .= $self->{'_pc'} x ( $ms / $decr );
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}
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}
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print $FH $string if $FH;
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$string;
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}
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# $terminal->Tputs($cap, $cnt, $FH);
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=item B<Tputs>
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Output the string for the given capability padded as appropriate without
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any parameter substitution.
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It takes three arguments:
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=over 2
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=item B<$cap>
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The capability whose string is to be output.
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=item B<$cnt>
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A count passed to Tpad to modify the padding applied to the output string.
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If $cnt is zero or one then the resulting string will be cached.
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=item B<$FH>
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An optional filehandle (or IO::Handle ) that output will be printed to.
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=back
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The appropriate string for the capability will be returned.
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=cut
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sub Tputs
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{ ## public
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my $self = shift;
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my ( $cap, $cnt, $FH ) = @_;
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my $string;
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$cnt = 0 unless $cnt;
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if ( $cnt > 1 )
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{
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$string = Tpad( $self, $self->{ '_' . $cap }, $cnt );
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}
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else
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{
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# cache result because Tpad can be slow
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unless ( exists $self->{$cap} )
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{
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$self->{$cap} =
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exists $self->{"_$cap"}
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? Tpad( $self, $self->{"_$cap"}, 1 )
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: undef;
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}
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$string = $self->{$cap};
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}
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print $FH $string if $FH;
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$string;
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}
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# $terminal->Tgoto($cap, $col, $row, $FH);
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=item B<Tgoto>
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B<Tgoto> decodes a cursor addressing string with the given parameters.
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There are four arguments:
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=over 2
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=item B<$cap>
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The name of the capability to be output.
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=item B<$col>
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The first value to be substituted in the output string ( usually the column
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in a cursor addressing capability )
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=item B<$row>
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The second value to be substituted in the output string (usually the row
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in cursor addressing capabilities)
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=item B<$FH>
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An optional filehandle (or IO::Handle ) to which the output string will be
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printed.
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=back
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Substitutions are made with $col and $row in the output string with the
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following sprintf() line formats:
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%% output `%'
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%d output value as in printf %d
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%2 output value as in printf %2d
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%3 output value as in printf %3d
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%. output value as in printf %c
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%+x add x to value, then do %.
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%>xy if value > x then add y, no output
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%r reverse order of two parameters, no output
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%i increment by one, no output
|
|
%B BCD (16*(value/10)) + (value%10), no output
|
|
|
|
%n exclusive-or all parameters with 0140 (Datamedia 2500)
|
|
%D Reverse coding (value - 2*(value%16)), no output (Delta Data)
|
|
|
|
The output string will be returned.
|
|
|
|
=cut
|
|
|
|
sub Tgoto
|
|
{ ## public
|
|
my $self = shift;
|
|
my ( $cap, $code, $tmp, $FH ) = @_;
|
|
my $string = $self->{ '_' . $cap };
|
|
my $result = '';
|
|
my $after = '';
|
|
my $online = 0;
|
|
my @tmp = ( $tmp, $code );
|
|
my $cnt = $code;
|
|
|
|
while ( $string =~ /^([^%]*)%(.)(.*)/ )
|
|
{
|
|
$result .= $1;
|
|
$code = $2;
|
|
$string = $3;
|
|
if ( $code eq 'd' )
|
|
{
|
|
$result .= sprintf( "%d", shift(@tmp) );
|
|
}
|
|
elsif ( $code eq '.' )
|
|
{
|
|
$tmp = shift(@tmp);
|
|
if ( $tmp == 0 || $tmp == 4 || $tmp == 10 )
|
|
{
|
|
if ($online)
|
|
{
|
|
++$tmp, $after .= $self->{'_up'} if $self->{'_up'};
|
|
}
|
|
else
|
|
{
|
|
++$tmp, $after .= $self->{'_bc'};
|
|
}
|
|
}
|
|
$result .= sprintf( "%c", $tmp );
|
|
$online = !$online;
|
|
}
|
|
elsif ( $code eq '+' )
|
|
{
|
|
$result .= sprintf( "%c", shift(@tmp) + ord($string) );
|
|
$string = substr( $string, 1, 99 );
|
|
$online = !$online;
|
|
}
|
|
elsif ( $code eq 'r' )
|
|
{
|
|
( $code, $tmp ) = @tmp;
|
|
@tmp = ( $tmp, $code );
|
|
$online = !$online;
|
|
}
|
|
elsif ( $code eq '>' )
|
|
{
|
|
( $code, $tmp, $string ) = unpack( "CCa99", $string );
|
|
if ( $tmp[0] > $code )
|
|
{
|
|
$tmp[0] += $tmp;
|
|
}
|
|
}
|
|
elsif ( $code eq '2' )
|
|
{
|
|
$result .= sprintf( "%02d", shift(@tmp) );
|
|
$online = !$online;
|
|
}
|
|
elsif ( $code eq '3' )
|
|
{
|
|
$result .= sprintf( "%03d", shift(@tmp) );
|
|
$online = !$online;
|
|
}
|
|
elsif ( $code eq 'i' )
|
|
{
|
|
( $code, $tmp ) = @tmp;
|
|
@tmp = ( $code + 1, $tmp + 1 );
|
|
}
|
|
else
|
|
{
|
|
return "OOPS";
|
|
}
|
|
}
|
|
$string = Tpad( $self, $result . $string . $after, $cnt );
|
|
print $FH $string if $FH;
|
|
$string;
|
|
}
|
|
|
|
# $terminal->Trequire(qw/ce ku kd/);
|
|
|
|
=item B<Trequire>
|
|
|
|
Takes a list of capabilities as an argument and will croak if one is not
|
|
found.
|
|
|
|
=cut
|
|
|
|
sub Trequire
|
|
{ ## public
|
|
my $self = shift;
|
|
my ( $cap, @undefined );
|
|
foreach $cap (@_)
|
|
{
|
|
push( @undefined, $cap )
|
|
unless defined $self->{ '_' . $cap } && $self->{ '_' . $cap };
|
|
}
|
|
croak "Terminal does not support: (@undefined)" if @undefined;
|
|
}
|
|
|
|
=back
|
|
|
|
=head1 EXAMPLES
|
|
|
|
use Term::Cap;
|
|
|
|
# Get terminal output speed
|
|
require POSIX;
|
|
my $termios = POSIX::Termios->new;
|
|
$termios->getattr;
|
|
my $ospeed = $termios->getospeed;
|
|
|
|
# Old-style ioctl code to get ospeed:
|
|
# require 'ioctl.pl';
|
|
# ioctl(TTY,$TIOCGETP,$sgtty);
|
|
# ($ispeed,$ospeed) = unpack('cc',$sgtty);
|
|
|
|
# allocate and initialize a terminal structure
|
|
my $terminal = Term::Cap->Tgetent({ TERM => undef, OSPEED => $ospeed });
|
|
|
|
# require certain capabilities to be available
|
|
$terminal->Trequire(qw/ce ku kd/);
|
|
|
|
# Output Routines, if $FH is undefined these just return the string
|
|
|
|
# Tgoto does the % expansion stuff with the given args
|
|
$terminal->Tgoto('cm', $col, $row, $FH);
|
|
|
|
# Tputs doesn't do any % expansion.
|
|
$terminal->Tputs('dl', $count = 1, $FH);
|
|
|
|
=head1 COPYRIGHT AND LICENSE
|
|
|
|
Copyright 1995-2015 (c) perl5 porters.
|
|
|
|
This software is free software and can be modified and distributed under
|
|
the same terms as Perl itself.
|
|
|
|
Please see the file README in the Perl source distribution for details of
|
|
the Perl license.
|
|
|
|
=head1 AUTHOR
|
|
|
|
This module is part of the core Perl distribution and is also maintained
|
|
for CPAN by Jonathan Stowe <jns@gellyfish.co.uk>.
|
|
|
|
The code is hosted on Github: https://github.com/jonathanstowe/Term-Cap
|
|
please feel free to fork, submit patches etc, etc there.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
termcap(5)
|
|
|
|
=cut
|
|
|
|
# Below is a default entry for systems where there are terminals but no
|
|
# termcap
|
|
1;
|
|
__DATA__
|
|
vt220|vt200|DEC VT220 in vt100 emulation mode:
|
|
am:mi:xn:xo:
|
|
co#80:li#24:
|
|
RA=\E[?7l:SA=\E[?7h:
|
|
ac=kkllmmjjnnwwqquuttvvxx:ae=\E(B:al=\E[L:as=\E(0:
|
|
bl=^G:cd=\E[J:ce=\E[K:cl=\E[H\E[2J:cm=\E[%i%d;%dH:
|
|
cr=^M:cs=\E[%i%d;%dr:dc=\E[P:dl=\E[M:do=\E[B:
|
|
ei=\E[4l:ho=\E[H:im=\E[4h:
|
|
is=\E[1;24r\E[24;1H:
|
|
nd=\E[C:
|
|
kd=\E[B::kl=\E[D:kr=\E[C:ku=\E[A:le=^H:
|
|
mb=\E[5m:md=\E[1m:me=\E[m:mr=\E[7m:
|
|
kb=\0177:
|
|
r2=\E>\E[24;1H\E[?3l\E[?4l\E[?5l\E[?7h\E[?8h\E=:rc=\E8:
|
|
sc=\E7:se=\E[27m:sf=\ED:so=\E[7m:sr=\EM:ta=^I:
|
|
ue=\E[24m:up=\E[A:us=\E[4m:ve=\E[?25h:vi=\E[?25l:
|
|
|