package Term::Cap;
use Carp;
use strict;
use vars qw($VERSION $VMS_TERMCAP);
use vars qw($termpat $state $first $entry);
$VERSION = '1.07';
# Version undef: Thu Dec 14 20:02:42 CST 1995 by sanders@bsdi.com
# Version 1.00: Thu Nov 30 23:34:29 EST 2000 by schwern@pobox.com
# [PATCH] $VERSION crusade, strict, tests, etc... all over lib/
# Version 1.01: Wed May 23 00:00:00 CST 2001 by d-lewart@uiuc.edu
# Avoid warnings in Tgetent and Tputs
# Version 1.02: Sat Nov 17 13:50:39 GMT 2001 by jns@gellyfish.com
# Altered layout of the POD
# Added Test::More to PREREQ_PM in Makefile.PL
# Fixed no argument Tgetent()
# Version 1.03: Wed Nov 28 10:09:38 GMT 2001
# VMS Support from Charles Lane <lane@DUPHY4.Physics.Drexel.Edu>
# Version 1.04: Thu Nov 29 16:22:03 GMT 2001
# Fixed warnings in test
# Version 1.05: Mon Dec 3 15:33:49 GMT 2001
# Don't try to fall back on infocmp if it's not there. From chromatic.
# Version 1.06: Thu Dec 6 18:43:22 GMT 2001
# Preload the default VMS termcap from Charles Lane
# Don't carp at setting OSPEED unless warnings are on.
# Version 1.07: Wed Jan 2 21:35:09 GMT 2002
# Sanity check on infocmp output from Norton Allen
# Repaired INSTALLDIRS thanks to Michael Schwern
# 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, $FH);
=head1 DESCRIPTION
These are low-level functions to extract and use capabilities from
a terminal capability (termcap) database.
More information on the terminal capabilities will be found in the
termcap manpage on most Unix-like systems.
=head2 METHODS
=over 4
The output strings for B<Tputs> are cached for counts of 1 for performance.
B<Tgoto> and B<Tpad> do not cache. C<$self-E<gt>{_xx}> is the raw termcap
data and C<$self-E<gt>{xx}> is the cached version.
print $terminal->Tpad($self->{_xx}, 1);
B<Tgoto>, B<Tputs>, and B<Tpad> return the string and will also
output the string to $FH if specified.
=cut
# Preload the default VMS termcap.
# If a different termcap is required then the text of one can be supplied
# in $Term::Cap::VMS_TERMCAP before Tgetent is called.
if ( $^O eq 'VMS') {
chomp (my @entry = <DATA>);
$VMS_TERMCAP = join '', @entry;
}
# 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]:[\\\/]/is
: $ENV{TERMCAP} =~ /^\//s));
if ((exists $ENV{TERMPATH}) && ($ENV{TERMPATH})) {
# Add the users $TERMPATH
push(@termcap_path, split(/(:|\s+)/, $ENV{TERMPATH}))
}
else {
# Defaults
push(@termcap_path,
$ENV{'HOME'} . '/.termcap',
'/etc/termcap',
'/usr/share/misc/termcap',
);
}
# return the list of those termcaps that exist
return grep(-f, @termcap_path);
}
=item B<Tgetent>
Returns a blessed object reference which the user can
then use to send the control strings to the terminal using B<Tputs>
and B<Tgoto>.
The function extracts the entry of the specified terminal
type I<TERM> (defaults to the environment variable I<TERM>) from the
database.
It will look in the environment for a I<TERMCAP> variable. If
found, and the value does not begin with a slash, and the terminal
type name is the same as the environment string I<TERM>, the
I<TERMCAP> string is used instead of reading a termcap file. If
it does begin with a slash, the string is used as a path name of
the termcap file to search. If I<TERMCAP> does not begin with a
slash and name is different from I<TERM>, B<Tgetent> searches the
files F<$HOME/.termcap>, F</etc/termcap>, and F</usr/share/misc/termcap>,
in that order, unless the environment variable I<TERMPATH> exists,
in which case it specifies a list of file pathnames (separated by
spaces or colons) to be searched B<instead>. 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<TERMCAP>
environment variable string it will continue the search in the
files as above.
The extracted termcap entry is available in the object
as C<$self-E<gt>{TERMCAP}>.
It takes a hash reference as an argument with two optional keys:
=over 2
=item OSPEED
The terminal output bit rate (often mistakenly called the baud rate)
for this terminal - if not set a warning will be generated
and it will be defaulted to 9600. I<OSPEED> can be be specified as
either a POSIX termios/SYSV termio speeds (where 9600 equals 9600) or
an old DSD-style speed ( where 13 equals 9600).
=item TERM
The terminal type whose termcap entry will be used - if not supplied it will
default to $ENV{TERM}: if that is not set then B<Tgetent> will croak.
=back
It calls C<croak> on failure.
=cut
sub Tgetent { ## public -- static method
my $class = shift;
my ($self) = @_;
$self = {} unless defined $self;
bless $self, $class;
my($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}) {
if ( $^W ) {
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:^/:s) && ($foo =~ m/(^|\|)${termpat}[:|]/s)) {
$entry = $foo;
}
my @termcap_path = termcap_path();
unless (@termcap_path || $entry)
{
# last resort--fake up a termcap from terminfo
local $ENV{TERM} = $term;
if ( $^O eq 'VMS' ) {
$entry = $VMS_TERMCAP;
}
else {
if ( grep { -x "$_/infocmp" } split /:/, $ENV{PATH} ) {
eval
{
my $tmp = `infocmp -C 2>/dev/null`;
if (( $tmp !~ m%^/%s ) && ( $tmp =~ /(^|\|)${termpat}[:|]/s)) {
$entry = $tmp;
}
};
}
}
}
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
$search = q{
while (<TERMCAP>) {
next if /^\\t/ || /^#/;
if ($_ =~ m/(^|\\|)${termpat}[:|]/o) {
chomp;
s/^[^:]*:// if $first++;
$state = 0;
while ($_ =~ s/\\\\$//) {
defined(my $x = <TERMCAP>) or last;
$_ .= $x; chomp;
}
last;
}
}
defined $entry or $entry = '';
$entry .= $_ if $_;
};
while ($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 (defined $field && $field =~ /^(\w\w)$/) {
$self->{'_' . $field} = 1 unless defined $self->{'_' . $1};
# print STDERR "DEBUG: flag $1\n";
}
elsif (defined $field && $field =~ /^(\w\w)\@/) {
$self->{'_' . $1} = "";
# print STDERR "DEBUG: unset $1\n";
}
elsif (defined $field && $field =~ /^(\w\w)#(.*)/) {
$self->{'_' . $1} = $2 unless defined $self->{'_' . $1};
# print STDERR "DEBUG: numeric $1 = $2\n";
}
elsif (defined $field && $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, $FH);
=item B<Tpad>
Outputs a literal string with appropriate padding for the current terminal.
It takes three arguments:
=over 2
=item B<$string>
The literal string to be output. If it starts with a number and an optional
'*' then the padding will be increased by an amount relative to this number,
if the '*' is present then this amount will me multiplied by $cnt. This part
of $string is removed before output/
=item B<$cnt>
Will be used to modify the padding applied to string as described above.
=item B<$FH>
An optional filehandle (or IO::Handle ) that output will be printed to.
=back
The padded $string is returned.
=cut
sub Tpad { ## public
my $self = shift;
my($string, $cnt, $FH) = @_;
my($decr, $ms);
if (defined $string && $string =~ /(^[\d.]+)(\*?)(.*)$/) {
$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, $FH);
=item B<Tputs>
Output the string for the given capability padded as appropriate without
any parameter substitution.
It takes three arguments:
=over 2
=item B<$cap>
The capability whose string is to be output.
=item B<$cnt>
A count passed to Tpad to modify the padding applied to the output string.
If $cnt is zero or one then the resulting string will be cached.
=item B<$FH>
An optional filehandle (or IO::Handle ) that output will be printed to.
=back
The appropriate string for the capability will be returned.
=cut
sub Tputs { ## public
my $self = shift;
my($cap, $cnt, $FH) = @_;
my $string;
$cnt = 0 unless $cnt;
if ($cnt > 1) {
$string = Tpad($self, $self->{'_' . $cap}, $cnt);
} else {
# cache result because Tpad can be slow
unless (exists $self->{$cap}) {
$self->{$cap} = exists $self->{"_$cap"} ?
Tpad($self, $self->{"_$cap"}, 1) : undef;
}
$string = $self->{$cap};
}
print $FH $string if $FH;
$string;
}
# $terminal->Tgoto($cap, $col, $row, $FH);
=item B<Tgoto>
B<Tgoto> decodes a cursor addressing string with the given parameters.
There are four arguments:
=over 2
=item B<$cap>
The name of the capability to be output.
=item B<$col>
The first value to be substituted in the output string ( usually the column
in a cursor addressing capability )
=item B<$row>
The second value to be substituted in the output string (usually the row
in cursor addressing capabilities)
=item B<$FH>
An optional filehandle (or IO::Handle ) to which the output string will be
printed.
=back
Substitutions are made with $col and $row in the output string with the
following sprintf() line formats:
%% 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)
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[$[] > $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/);
=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 = 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);
=head1 COPYRIGHT AND LICENSE
Please see the README file in distribution.
=head1 AUTHOR
This module is part of the core Perl distribution and is also maintained
for CPAN by Jonathan Stowe <jns@gellyfish.com>.
=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:
|
