package Term::Cap; use Carp; # Last updated: Thu Dec 14 20:02:42 CST 1995 by sanders@bsdi.com # TODO: # support Berkeley DB termcaps # should probably be a .xs module # force $FH into callers package? # keep $FH in object at Tgetent time? =head1 NAME Term::Cap - Perl termcap interface =head1 SYNOPSIS require Term::Cap; $terminal = Tgetent Term::Cap { TERM => undef, OSPEED => $ospeed }; $terminal->Trequire(qw/ce ku kd/); $terminal->Tgoto('cm', $col, $row, $FH); $terminal->Tputs('dl', $count, $FH); $terminal->Tpad($string, $count, $FH); =head1 DESCRIPTION These are low-level functions to extract and use capabilities from a terminal capability (termcap) database. The B function extracts the entry of the specified terminal type I (defaults to the environment variable I) from the database. It will look in the environment for a I variable. If found, and the value does not begin with a slash, and the terminal type name is the same as the environment string I, the I string is used instead of reading a termcap file. If it does begin with a slash, the string is used as a path name of the termcap file to search. If I does not begin with a slash and name is different from I, B searches the files F<$HOME/.termcap>, F, and F, in that order, unless the environment variable I exists, in which case it specifies a list of file pathnames (separated by spaces or colons) to be searched B. Whenever multiple files are searched and a tc field occurs in the requested entry, the entry it names must be found in the same file or one of the succeeding files. If there is a C<:tc=...:> in the I environment variable string it will continue the search in the files as above. I is the terminal output bit rate (often mistakenly called the baud rate). I can be specified as either a POSIX termios/SYSV termio speeds (where 9600 equals 9600) or an old BSD-style speeds (where 13 equals 9600). B returns a blessed object reference which the user can then use to send the control strings to the terminal using B and B. It calls C on failure. B decodes a cursor addressing string with the given parameters. The output strings for B are cached for counts of 1 for performance. B and B do not cache. C<$self-E{_xx}> is the raw termcap data and C<$self-E{xx}> is the cached version. print $terminal->Tpad($self->{_xx}, 1); B, B, and B return the string and will also output the string to $FH if specified. The extracted termcap entry is available in the object as C<$self-E{TERMCAP}>. =head1 EXAMPLES # Get terminal output speed require POSIX; my $termios = new POSIX::Termios; $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 $terminal = Tgetent Term::Cap { 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); =cut # Returns a list of termcap files to check. sub termcap_path { ## private my @termcap_path; # $TERMCAP, if it's a filespec push(@termcap_path, $ENV{TERMCAP}) if ((exists $ENV{TERMCAP}) && (($^O eq 'os2' || $^O eq 'MSWin32' || $^O eq 'dos') ? $ENV{TERMCAP} =~ /^[a-z]:[\\\/]/i : $ENV{TERMCAP} =~ /^\//)); if ((exists $ENV{TERMPATH}) && ($ENV{TERMPATH})) { # Add the users $TERMPATH push(@termcap_path, split(/(:|\s+)/, $ENV{TERMPATH})) } else { # Defaults push(@termcap_path, $ENV{'HOME'} . '/.termcap', '/etc/termcap', '/usr/share/misc/termcap', ); } # return the list of those termcaps that exist grep(-f, @termcap_path); } sub Tgetent { ## public -- static method my $class = shift; my $self = bless shift, $class; my($term,$cap,$search,$field,$max,$tmp_term,$TERMCAP); local($termpat,$state,$first,$entry); # used inside eval local $_; # Compute PADDING factor from OSPEED (to be used by Tpad) if (! $self->{OSPEED}) { carp "OSPEED was not set, defaulting to 9600"; $self->{OSPEED} = 9600; } if ($self->{OSPEED} < 16) { # delays for old style speeds my @pad = (0,200,133.3,90.9,74.3,66.7,50,33.3,16.7,8.3,5.5,4.1,2,1,.5,.2); $self->{PADDING} = $pad[$self->{OSPEED}]; } else { $self->{PADDING} = 10000 / $self->{OSPEED}; } $self->{TERM} = ($self->{TERM} || $ENV{TERM} || croak "TERM not set"); $term = $self->{TERM}; # $term is the term type we are looking for # $tmp_term is always the next term (possibly :tc=...:) we are looking for $tmp_term = $self->{TERM}; # protect any pattern metacharacters in $tmp_term $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; my $foo = (exists $ENV{TERMCAP} ? $ENV{TERMCAP} : ''); # $entry is the extracted termcap entry if (($foo !~ m:^/:) && ($foo =~ m/(^|\|)${termpat}[:|]/)) { $entry = $foo; } my @termcap_path = termcap_path; croak "Can't find a valid termcap file" unless @termcap_path || $entry; $state = 1; # 0 == finished # 1 == next file # 2 == search again $first = 0; # first entry (keeps term name) $max = 32; # max :tc=...:'s if ($entry) { # ok, we're starting with $TERMCAP $first++; # we're the first entry # do we need to continue? if ($entry =~ s/:tc=([^:]+):/:/) { $tmp_term = $1; # protect any pattern metacharacters in $tmp_term $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; } else { $state = 0; # we're already finished } } # This is eval'ed inside the while loop for each file $search = q{ while () { next if /^\\t/ || /^#/; if ($_ =~ m/(^|\\|)${termpat}[:|]/o) { chomp; s/^[^:]*:// if $first++; $state = 0; while ($_ =~ s/\\\\$//) { defined(my $x = ) or last; $_ .= $x; chomp; } last; } } defined $entry or $entry = ''; $entry .= $_; }; while ($state != 0) { if ($state == 1) { # get the next TERMCAP $TERMCAP = shift @termcap_path || croak "failed termcap lookup on $tmp_term"; } else { # do the same file again # prevent endless recursion $max-- || croak "failed termcap loop at $tmp_term"; $state = 1; # ok, maybe do a new file next time } open(TERMCAP,"< $TERMCAP\0") || croak "open $TERMCAP: $!"; eval $search; die $@ if $@; close TERMCAP; # If :tc=...: found then search this file again $entry =~ s/:tc=([^:]+):/:/ && ($tmp_term = $1, $state = 2); # protect any pattern metacharacters in $tmp_term $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; } croak "Can't find $term" if $entry eq ''; $entry =~ s/:+\s*:+/:/g; # cleanup $entry $entry =~ s/:+/:/g; # cleanup $entry $self->{TERMCAP} = $entry; # save it # print STDERR "DEBUG: $entry = ", $entry, "\n"; # Precompile $entry into the object $entry =~ s/^[^:]*://; foreach $field (split(/:[\s:\\]*/,$entry)) { if ($field =~ /^(\w\w)$/) { $self->{'_' . $field} = 1 unless defined $self->{'_' . $1}; # print STDERR "DEBUG: flag $1\n"; } elsif ($field =~ /^(\w\w)\@/) { $self->{'_' . $1} = ""; # print STDERR "DEBUG: unset $1\n"; } elsif ($field =~ /^(\w\w)#(.*)/) { $self->{'_' . $1} = $2 unless defined $self->{'_' . $1}; # print STDERR "DEBUG: numeric $1 = $2\n"; } elsif ($field =~ /^(\w\w)=(.*)/) { # print STDERR "DEBUG: string $1 = $2\n"; next if defined $self->{'_' . ($cap = $1)}; $_ = $2; s/\\E/\033/g; s/\\(\d\d\d)/pack('c',oct($1) & 0177)/eg; s/\\n/\n/g; s/\\r/\r/g; s/\\t/\t/g; s/\\b/\b/g; s/\\f/\f/g; s/\\\^/\377/g; s/\^\?/\177/g; s/\^(.)/pack('c',ord($1) & 31)/eg; s/\\(.)/$1/g; s/\377/^/g; $self->{'_' . $cap} = $_; } # else { carp "junk in $term ignored: $field"; } } $self->{'_pc'} = "\0" unless defined $self->{'_pc'}; $self->{'_bc'} = "\b" unless defined $self->{'_bc'}; $self; } # $terminal->Tpad($string, $cnt, $FH); sub Tpad { ## public my $self = shift; my($string, $cnt, $FH) = @_; my($decr, $ms); if ($string =~ /(^[\d.]+)(\*?)(.*)$/) { $ms = $1; $ms *= $cnt if $2; $string = $3; $decr = $self->{PADDING}; if ($decr > .1) { $ms += $decr / 2; $string .= $self->{'_pc'} x ($ms / $decr); } } print $FH $string if $FH; $string; } # $terminal->Tputs($cap, $cnt, $FH); sub Tputs { ## public my $self = shift; my($cap, $cnt, $FH) = @_; my $string; if ($cnt > 1) { $string = Tpad($self, $self->{'_' . $cap}, $cnt); } else { # cache result because Tpad can be slow $string = defined $self->{$cap} ? $self->{$cap} : ($self->{$cap} = Tpad($self, $self->{'_' . $cap}, 1)); } print $FH $string if $FH; $string; } # %% output `%' # %d output value as in printf %d # %2 output value as in printf %2d # %3 output value as in printf %3d # %. output value as in printf %c # %+x add x to value, then do %. # # %>xy if value > x then add y, no output # %r reverse order of two parameters, no output # %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) # # $terminal->Tgoto($cap, $col, $row, $FH); 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[$[] > $code) { $tmp[$[] += $tmp; } } elsif ($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/); 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; } 1;