4 # Last updated: Thu Dec 14 20:02:42 CST 1995 by sanders@bsdi.com
7 # support Berkeley DB termcaps
8 # should probably be a .xs module
9 # force $FH into callers package?
10 # keep $FH in object at Tgetent time?
14 Term::Cap - Perl termcap interface
19 $terminal = Tgetent Term::Cap { TERM => undef, OSPEED => $ospeed };
20 $terminal->Trequire(qw/ce ku kd/);
21 $terminal->Tgoto('cm', $col, $row, $FH);
22 $terminal->Tputs('dl', $count, $FH);
23 $terminal->Tpad($string, $count, $FH);
27 These are low-level functions to extract and use capabilities from
28 a terminal capability (termcap) database.
30 The B<Tgetent> function extracts the entry of the specified terminal
31 type I<TERM> (defaults to the environment variable I<TERM>) from the
34 It will look in the environment for a I<TERMCAP> variable. If
35 found, and the value does not begin with a slash, and the terminal
36 type name is the same as the environment string I<TERM>, the
37 I<TERMCAP> string is used instead of reading a termcap file. If
38 it does begin with a slash, the string is used as a path name of
39 the termcap file to search. If I<TERMCAP> does not begin with a
40 slash and name is different from I<TERM>, B<Tgetent> searches the
41 files F<$HOME/.termcap>, F</etc/termcap>, and F</usr/share/misc/termcap>,
42 in that order, unless the environment variable I<TERMPATH> exists,
43 in which case it specifies a list of file pathnames (separated by
44 spaces or colons) to be searched B<instead>. Whenever multiple
45 files are searched and a tc field occurs in the requested entry,
46 the entry it names must be found in the same file or one of the
47 succeeding files. If there is a C<:tc=...:> in the I<TERMCAP>
48 environment variable string it will continue the search in the
51 I<OSPEED> is the terminal output bit rate (often mistakenly called
52 the baud rate). I<OSPEED> can be specified as either a POSIX
53 termios/SYSV termio speeds (where 9600 equals 9600) or an old
54 BSD-style speeds (where 13 equals 9600).
56 B<Tgetent> returns a blessed object reference which the user can
57 then use to send the control strings to the terminal using B<Tputs>
58 and B<Tgoto>. It calls C<croak> on failure.
60 B<Tgoto> decodes a cursor addressing string with the given parameters.
62 The output strings for B<Tputs> are cached for counts of 1 for performance.
63 B<Tgoto> and B<Tpad> do not cache. C<$self-E<gt>{_xx}> is the raw termcap
64 data and C<$self-E<gt>{xx}> is the cached version.
66 print $terminal->Tpad($self->{_xx}, 1);
68 B<Tgoto>, B<Tputs>, and B<Tpad> return the string and will also
69 output the string to $FH if specified.
71 The extracted termcap entry is available in the object
72 as C<$self-E<gt>{TERMCAP}>.
76 # Get terminal output speed
78 my $termios = new POSIX::Termios;
80 my $ospeed = $termios->getospeed;
82 # Old-style ioctl code to get ospeed:
84 # ioctl(TTY,$TIOCGETP,$sgtty);
85 # ($ispeed,$ospeed) = unpack('cc',$sgtty);
87 # allocate and initialize a terminal structure
88 $terminal = Tgetent Term::Cap { TERM => undef, OSPEED => $ospeed };
90 # require certain capabilities to be available
91 $terminal->Trequire(qw/ce ku kd/);
93 # Output Routines, if $FH is undefined these just return the string
95 # Tgoto does the % expansion stuff with the given args
96 $terminal->Tgoto('cm', $col, $row, $FH);
98 # Tputs doesn't do any % expansion.
99 $terminal->Tputs('dl', $count = 1, $FH);
103 # Returns a list of termcap files to check.
104 sub termcap_path { ## private
106 # $TERMCAP, if it's a filespec
107 push(@termcap_path, $ENV{TERMCAP}) if ((exists $ENV{TERMCAP}) &&
108 ($ENV{TERMCAP} =~ /^\//));
109 if ((exists $ENV{TERMPATH}) && ($ENV{TERMPATH})) {
110 # Add the users $TERMPATH
111 push(@termcap_path, split(/(:|\s+)/, $ENV{TERMPATH}))
116 $ENV{'HOME'} . '/.termcap',
118 '/usr/share/misc/termcap',
121 # return the list of those termcaps that exist
122 grep(-f, @termcap_path);
125 sub Tgetent { ## public -- static method
127 my $self = bless shift, $class;
128 my($term,$cap,$search,$field,$max,$tmp_term,$TERMCAP);
129 local($termpat,$state,$first,$entry); # used inside eval
132 # Compute PADDING factor from OSPEED (to be used by Tpad)
133 if (! $self->{OSPEED}) {
134 carp "OSPEED was not set, defaulting to 9600";
135 $self->{OSPEED} = 9600;
137 if ($self->{OSPEED} < 16) {
138 # delays for old style speeds
139 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);
140 $self->{PADDING} = $pad[$self->{OSPEED}];
143 $self->{PADDING} = 10000 / $self->{OSPEED};
146 $self->{TERM} = ($self->{TERM} || $ENV{TERM} || croak "TERM not set");
147 $term = $self->{TERM}; # $term is the term type we are looking for
149 # $tmp_term is always the next term (possibly :tc=...:) we are looking for
150 $tmp_term = $self->{TERM};
151 # protect any pattern metacharacters in $tmp_term
152 $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g;
154 my $foo = (exists $ENV{TERMCAP} ? $ENV{TERMCAP} : '');
156 # $entry is the extracted termcap entry
157 if (($foo !~ m:^/:) && ($foo =~ m/(^|\|)${termpat}[:|]/)) {
161 my @termcap_path = termcap_path;
162 croak "Can't find a valid termcap file" unless @termcap_path || $entry;
164 $state = 1; # 0 == finished
168 $first = 0; # first entry (keeps term name)
170 $max = 32; # max :tc=...:'s
173 # ok, we're starting with $TERMCAP
174 $first++; # we're the first entry
175 # do we need to continue?
176 if ($entry =~ s/:tc=([^:]+):/:/) {
178 # protect any pattern metacharacters in $tmp_term
179 $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g;
182 $state = 0; # we're already finished
186 # This is eval'ed inside the while loop for each file
188 while ($_ = <TERMCAP>) {
189 next if /^\\t/ || /^#/;
190 if ($_ =~ m/(^|\\|)${termpat}[:|]/o) {
192 s/^[^:]*:// if $first++;
194 while ($_ =~ s/\\\\$//) { $_ .= <TERMCAP>; chomp; }
198 defined $entry or $entry = '';
202 while ($state != 0) {
204 # get the next TERMCAP
205 $TERMCAP = shift @termcap_path
206 || croak "failed termcap lookup on $tmp_term";
209 # do the same file again
210 # prevent endless recursion
211 $max-- || croak "failed termcap loop at $tmp_term";
212 $state = 1; # ok, maybe do a new file next time
215 open(TERMCAP,"< $TERMCAP\0") || croak "open $TERMCAP: $!";
220 # If :tc=...: found then search this file again
221 $entry =~ s/:tc=([^:]+):/:/ && ($tmp_term = $1, $state = 2);
222 # protect any pattern metacharacters in $tmp_term
223 $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g;
226 croak "Can't find $term" if $entry eq '';
227 $entry =~ s/:+\s*:+/:/g; # cleanup $entry
228 $entry =~ s/:+/:/g; # cleanup $entry
229 $self->{TERMCAP} = $entry; # save it
230 # print STDERR "DEBUG: $entry = ", $entry, "\n";
232 # Precompile $entry into the object
233 $entry =~ s/^[^:]*://;
234 foreach $field (split(/:[\s:\\]*/,$entry)) {
235 if ($field =~ /^(\w\w)$/) {
236 $self->{'_' . $field} = 1 unless defined $self->{'_' . $1};
237 # print STDERR "DEBUG: flag $1\n";
239 elsif ($field =~ /^(\w\w)\@/) {
240 $self->{'_' . $1} = "";
241 # print STDERR "DEBUG: unset $1\n";
243 elsif ($field =~ /^(\w\w)#(.*)/) {
244 $self->{'_' . $1} = $2 unless defined $self->{'_' . $1};
245 # print STDERR "DEBUG: numeric $1 = $2\n";
247 elsif ($field =~ /^(\w\w)=(.*)/) {
248 # print STDERR "DEBUG: string $1 = $2\n";
249 next if defined $self->{'_' . ($cap = $1)};
252 s/\\(\d\d\d)/pack('c',oct($1) & 0177)/eg;
260 s/\^(.)/pack('c',ord($1) & 31)/eg;
263 $self->{'_' . $cap} = $_;
265 # else { carp "junk in $term ignored: $field"; }
267 $self->{'_pc'} = "\0" unless defined $self->{'_pc'};
268 $self->{'_bc'} = "\b" unless defined $self->{'_bc'};
272 # $terminal->Tpad($string, $cnt, $FH);
275 my($string, $cnt, $FH) = @_;
278 if ($string =~ /(^[\d.]+)(\*?)(.*)$/) {
282 $decr = $self->{PADDING};
285 $string .= $self->{'_pc'} x ($ms / $decr);
288 print $FH $string if $FH;
292 # $terminal->Tputs($cap, $cnt, $FH);
293 sub Tputs { ## public
295 my($cap, $cnt, $FH) = @_;
299 $string = Tpad($self, $self->{'_' . $cap}, $cnt);
301 # cache result because Tpad can be slow
302 $string = defined $self->{$cap} ? $self->{$cap} :
303 ($self->{$cap} = Tpad($self, $self->{'_' . $cap}, 1));
305 print $FH $string if $FH;
310 # %d output value as in printf %d
311 # %2 output value as in printf %2d
312 # %3 output value as in printf %3d
313 # %. output value as in printf %c
314 # %+x add x to value, then do %.
316 # %>xy if value > x then add y, no output
317 # %r reverse order of two parameters, no output
318 # %i increment by one, no output
319 # %B BCD (16*(value/10)) + (value%10), no output
321 # %n exclusive-or all parameters with 0140 (Datamedia 2500)
322 # %D Reverse coding (value - 2*(value%16)), no output (Delta Data)
324 # $terminal->Tgoto($cap, $col, $row, $FH);
325 sub Tgoto { ## public
327 my($cap, $code, $tmp, $FH) = @_;
328 my $string = $self->{'_' . $cap};
332 my @tmp = ($tmp,$code);
335 while ($string =~ /^([^%]*)%(.)(.*)/) {
340 $result .= sprintf("%d",shift(@tmp));
342 elsif ($code eq '.') {
344 if ($tmp == 0 || $tmp == 4 || $tmp == 10) {
346 ++$tmp, $after .= $self->{'_up'} if $self->{'_up'};
349 ++$tmp, $after .= $self->{'_bc'};
352 $result .= sprintf("%c",$tmp);
355 elsif ($code eq '+') {
356 $result .= sprintf("%c",shift(@tmp)+ord($string));
357 $string = substr($string,1,99);
360 elsif ($code eq 'r') {
365 elsif ($code eq '>') {
366 ($code,$tmp,$string) = unpack("CCa99",$string);
367 if ($tmp[$[] > $code) {
371 elsif ($code eq '2') {
372 $result .= sprintf("%02d",shift(@tmp));
375 elsif ($code eq '3') {
376 $result .= sprintf("%03d",shift(@tmp));
379 elsif ($code eq 'i') {
381 @tmp = ($code+1,$tmp+1);
387 $string = Tpad($self, $result . $string . $after, $cnt);
388 print $FH $string if $FH;
392 # $terminal->Trequire(qw/ce ku kd/);
393 sub Trequire { ## public
397 push(@undefined, $cap)
398 unless defined $self->{'_' . $cap} && $self->{'_' . $cap};
400 croak "Terminal does not support: (@undefined)" if @undefined;