Commit | Line | Data |
---|---|---|
a0d0e21e | 1 | package Term::Cap; |
cb1a09d0 | 2 | use Carp; |
85e6fe83 | 3 | |
cb1a09d0 | 4 | # Last updated: Thu Dec 14 20:02:42 CST 1995 by sanders@bsdi.com |
a687059c | 5 | |
cb1a09d0 AD |
6 | # TODO: |
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? | |
11 | ||
12 | =head1 NAME | |
13 | ||
14 | Term::Cap - Perl termcap interface | |
15 | ||
16 | =head1 SYNOPSIS | |
17 | ||
18 | require Term::Cap; | |
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, $FH); | |
24 | ||
25 | =head1 DESCRIPTION | |
26 | ||
27 | These are low-level functions to extract and use capabilities from | |
28 | a terminal capability (termcap) database. | |
29 | ||
30 | The B<Tgetent> function extracts the entry of the specified terminal | |
31 | type I<TERM> (defaults to the environment variable I<TERM>) from the | |
32 | database. | |
33 | ||
34 | It will look in the environment for a I<TERMCAP> variable. If | |
35 | found, and the value does not begin with a slash, and the terminal | |
36 | type name is the same as the environment string I<TERM>, the | |
37 | I<TERMCAP> string is used instead of reading a termcap file. If | |
38 | it does begin with a slash, the string is used as a path name of | |
39 | the termcap file to search. If I<TERMCAP> does not begin with a | |
40 | slash and name is different from I<TERM>, B<Tgetent> searches the | |
41 | files F<$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 | |
49 | files as above. | |
50 | ||
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). | |
55 | ||
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. | |
59 | ||
60 | B<Tgoto> decodes a cursor addressing string with the given parameters. | |
61 | ||
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. | |
65 | ||
66 | print $terminal->Tpad($self->{_xx}, 1); | |
67 | ||
68 | B<Tgoto>, B<Tputs>, and B<Tpad> return the string and will also | |
69 | output the string to $FH if specified. | |
70 | ||
71 | The extracted termcap entry is available in the object | |
72 | as C<$self-E<gt>{TERMCAP}>. | |
73 | ||
74 | =head1 EXAMPLES | |
75 | ||
76 | # Get terminal output speed | |
77 | require POSIX; | |
78 | my $termios = new POSIX::Termios; | |
79 | $termios->getattr; | |
80 | my $ospeed = $termios->getospeed; | |
81 | ||
82 | # Old-style ioctl code to get ospeed: | |
83 | # require 'ioctl.pl'; | |
84 | # ioctl(TTY,$TIOCGETP,$sgtty); | |
85 | # ($ispeed,$ospeed) = unpack('cc',$sgtty); | |
86 | ||
87 | # allocate and initialize a terminal structure | |
88 | $terminal = Tgetent Term::Cap { TERM => undef, OSPEED => $ospeed }; | |
89 | ||
90 | # require certain capabilities to be available | |
91 | $terminal->Trequire(qw/ce ku kd/); | |
92 | ||
93 | # Output Routines, if $FH is undefined these just return the string | |
94 | ||
95 | # Tgoto does the % expansion stuff with the given args | |
96 | $terminal->Tgoto('cm', $col, $row, $FH); | |
97 | ||
98 | # Tputs doesn't do any % expansion. | |
99 | $terminal->Tputs('dl', $count = 1, $FH); | |
100 | ||
101 | =cut | |
102 | ||
103 | # Returns a list of termcap files to check. | |
104 | sub termcap_path { ## private | |
105 | my @termcap_path; | |
106 | # $TERMCAP, if it's a filespec | |
7a2e2cd6 | 107 | push(@termcap_path, $ENV{TERMCAP}) |
108 | if ((exists $ENV{TERMCAP}) && | |
39e571d4 | 109 | (($^O eq 'os2' || $^O eq 'MSWin32' || $^O eq 'dos') |
fe6f1558 GS |
110 | ? $ENV{TERMCAP} =~ /^[a-z]:[\\\/]/is |
111 | : $ENV{TERMCAP} =~ /^\//s)); | |
c07a80fd | 112 | if ((exists $ENV{TERMPATH}) && ($ENV{TERMPATH})) { |
cb1a09d0 AD |
113 | # Add the users $TERMPATH |
114 | push(@termcap_path, split(/(:|\s+)/, $ENV{TERMPATH})) | |
115 | } | |
116 | else { | |
117 | # Defaults | |
118 | push(@termcap_path, | |
119 | $ENV{'HOME'} . '/.termcap', | |
120 | '/etc/termcap', | |
121 | '/usr/share/misc/termcap', | |
122 | ); | |
a687059c | 123 | } |
cb1a09d0 | 124 | # return the list of those termcaps that exist |
748a9306 LW |
125 | grep(-f, @termcap_path); |
126 | } | |
127 | ||
cb1a09d0 AD |
128 | sub Tgetent { ## public -- static method |
129 | my $class = shift; | |
130 | my $self = bless shift, $class; | |
131 | my($term,$cap,$search,$field,$max,$tmp_term,$TERMCAP); | |
132 | local($termpat,$state,$first,$entry); # used inside eval | |
133 | local $_; | |
134 | ||
135 | # Compute PADDING factor from OSPEED (to be used by Tpad) | |
136 | if (! $self->{OSPEED}) { | |
137 | carp "OSPEED was not set, defaulting to 9600"; | |
138 | $self->{OSPEED} = 9600; | |
139 | } | |
140 | if ($self->{OSPEED} < 16) { | |
141 | # delays for old style speeds | |
142 | 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); | |
143 | $self->{PADDING} = $pad[$self->{OSPEED}]; | |
144 | } | |
145 | else { | |
146 | $self->{PADDING} = 10000 / $self->{OSPEED}; | |
147 | } | |
148 | ||
149 | $self->{TERM} = ($self->{TERM} || $ENV{TERM} || croak "TERM not set"); | |
150 | $term = $self->{TERM}; # $term is the term type we are looking for | |
151 | ||
152 | # $tmp_term is always the next term (possibly :tc=...:) we are looking for | |
153 | $tmp_term = $self->{TERM}; | |
154 | # protect any pattern metacharacters in $tmp_term | |
155 | $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; | |
156 | ||
c07a80fd | 157 | my $foo = (exists $ENV{TERMCAP} ? $ENV{TERMCAP} : ''); |
cb1a09d0 AD |
158 | |
159 | # $entry is the extracted termcap entry | |
fe6f1558 | 160 | if (($foo !~ m:^/:s) && ($foo =~ m/(^|\|)${termpat}[:|]/s)) { |
cb1a09d0 AD |
161 | $entry = $foo; |
162 | } | |
163 | ||
164 | my @termcap_path = termcap_path; | |
165 | croak "Can't find a valid termcap file" unless @termcap_path || $entry; | |
166 | ||
167 | $state = 1; # 0 == finished | |
168 | # 1 == next file | |
169 | # 2 == search again | |
170 | ||
171 | $first = 0; # first entry (keeps term name) | |
172 | ||
173 | $max = 32; # max :tc=...:'s | |
174 | ||
175 | if ($entry) { | |
176 | # ok, we're starting with $TERMCAP | |
177 | $first++; # we're the first entry | |
178 | # do we need to continue? | |
179 | if ($entry =~ s/:tc=([^:]+):/:/) { | |
180 | $tmp_term = $1; | |
181 | # protect any pattern metacharacters in $tmp_term | |
182 | $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; | |
183 | } | |
184 | else { | |
185 | $state = 0; # we're already finished | |
186 | } | |
187 | } | |
188 | ||
189 | # This is eval'ed inside the while loop for each file | |
190 | $search = q{ | |
54310121 | 191 | while (<TERMCAP>) { |
cb1a09d0 AD |
192 | next if /^\\t/ || /^#/; |
193 | if ($_ =~ m/(^|\\|)${termpat}[:|]/o) { | |
194 | chomp; | |
195 | s/^[^:]*:// if $first++; | |
196 | $state = 0; | |
54310121 | 197 | while ($_ =~ s/\\\\$//) { |
198 | defined(my $x = <TERMCAP>) or last; | |
199 | $_ .= $x; chomp; | |
200 | } | |
cb1a09d0 | 201 | last; |
748a9306 | 202 | } |
cb1a09d0 | 203 | } |
55497cff | 204 | defined $entry or $entry = ''; |
205 | $entry .= $_; | |
cb1a09d0 | 206 | }; |
748a9306 | 207 | |
cb1a09d0 AD |
208 | while ($state != 0) { |
209 | if ($state == 1) { | |
210 | # get the next TERMCAP | |
211 | $TERMCAP = shift @termcap_path | |
212 | || croak "failed termcap lookup on $tmp_term"; | |
213 | } | |
214 | else { | |
215 | # do the same file again | |
216 | # prevent endless recursion | |
217 | $max-- || croak "failed termcap loop at $tmp_term"; | |
218 | $state = 1; # ok, maybe do a new file next time | |
219 | } | |
220 | ||
221 | open(TERMCAP,"< $TERMCAP\0") || croak "open $TERMCAP: $!"; | |
222 | eval $search; | |
223 | die $@ if $@; | |
224 | close TERMCAP; | |
225 | ||
226 | # If :tc=...: found then search this file again | |
227 | $entry =~ s/:tc=([^:]+):/:/ && ($tmp_term = $1, $state = 2); | |
228 | # protect any pattern metacharacters in $tmp_term | |
229 | $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; | |
a687059c | 230 | } |
cb1a09d0 AD |
231 | |
232 | croak "Can't find $term" if $entry eq ''; | |
233 | $entry =~ s/:+\s*:+/:/g; # cleanup $entry | |
234 | $entry =~ s/:+/:/g; # cleanup $entry | |
235 | $self->{TERMCAP} = $entry; # save it | |
236 | # print STDERR "DEBUG: $entry = ", $entry, "\n"; | |
a687059c | 237 | |
748a9306 | 238 | # Precompile $entry into the object |
cb1a09d0 | 239 | $entry =~ s/^[^:]*://; |
748a9306 | 240 | foreach $field (split(/:[\s:\\]*/,$entry)) { |
cb1a09d0 AD |
241 | if ($field =~ /^(\w\w)$/) { |
242 | $self->{'_' . $field} = 1 unless defined $self->{'_' . $1}; | |
243 | # print STDERR "DEBUG: flag $1\n"; | |
748a9306 LW |
244 | } |
245 | elsif ($field =~ /^(\w\w)\@/) { | |
cb1a09d0 AD |
246 | $self->{'_' . $1} = ""; |
247 | # print STDERR "DEBUG: unset $1\n"; | |
a687059c LW |
248 | } |
249 | elsif ($field =~ /^(\w\w)#(.*)/) { | |
cb1a09d0 AD |
250 | $self->{'_' . $1} = $2 unless defined $self->{'_' . $1}; |
251 | # print STDERR "DEBUG: numeric $1 = $2\n"; | |
a687059c LW |
252 | } |
253 | elsif ($field =~ /^(\w\w)=(.*)/) { | |
cb1a09d0 AD |
254 | # print STDERR "DEBUG: string $1 = $2\n"; |
255 | next if defined $self->{'_' . ($cap = $1)}; | |
a687059c LW |
256 | $_ = $2; |
257 | s/\\E/\033/g; | |
ecfc5424 | 258 | s/\\(\d\d\d)/pack('c',oct($1) & 0177)/eg; |
a687059c LW |
259 | s/\\n/\n/g; |
260 | s/\\r/\r/g; | |
261 | s/\\t/\t/g; | |
262 | s/\\b/\b/g; | |
263 | s/\\f/\f/g; | |
264 | s/\\\^/\377/g; | |
265 | s/\^\?/\177/g; | |
63f2c1e1 | 266 | s/\^(.)/pack('c',ord($1) & 31)/eg; |
a687059c LW |
267 | s/\\(.)/$1/g; |
268 | s/\377/^/g; | |
cb1a09d0 | 269 | $self->{'_' . $cap} = $_; |
a687059c | 270 | } |
cb1a09d0 | 271 | # else { carp "junk in $term ignored: $field"; } |
a687059c | 272 | } |
cb1a09d0 AD |
273 | $self->{'_pc'} = "\0" unless defined $self->{'_pc'}; |
274 | $self->{'_bc'} = "\b" unless defined $self->{'_bc'}; | |
275 | $self; | |
a687059c LW |
276 | } |
277 | ||
cb1a09d0 AD |
278 | # $terminal->Tpad($string, $cnt, $FH); |
279 | sub Tpad { ## public | |
280 | my $self = shift; | |
281 | my($string, $cnt, $FH) = @_; | |
282 | my($decr, $ms); | |
a687059c | 283 | |
a687059c LW |
284 | if ($string =~ /(^[\d.]+)(\*?)(.*)$/) { |
285 | $ms = $1; | |
748a9306 | 286 | $ms *= $cnt if $2; |
a687059c | 287 | $string = $3; |
cb1a09d0 | 288 | $decr = $self->{PADDING}; |
a687059c LW |
289 | if ($decr > .1) { |
290 | $ms += $decr / 2; | |
cb1a09d0 | 291 | $string .= $self->{'_pc'} x ($ms / $decr); |
a687059c LW |
292 | } |
293 | } | |
294 | print $FH $string if $FH; | |
295 | $string; | |
296 | } | |
297 | ||
cb1a09d0 AD |
298 | # $terminal->Tputs($cap, $cnt, $FH); |
299 | sub Tputs { ## public | |
300 | my $self = shift; | |
301 | my($cap, $cnt, $FH) = @_; | |
302 | my $string; | |
748a9306 LW |
303 | |
304 | if ($cnt > 1) { | |
cb1a09d0 | 305 | $string = Tpad($self, $self->{'_' . $cap}, $cnt); |
748a9306 | 306 | } else { |
cb1a09d0 AD |
307 | # cache result because Tpad can be slow |
308 | $string = defined $self->{$cap} ? $self->{$cap} : | |
309 | ($self->{$cap} = Tpad($self, $self->{'_' . $cap}, 1)); | |
748a9306 LW |
310 | } |
311 | print $FH $string if $FH; | |
312 | $string; | |
313 | } | |
314 | ||
315 | # %% output `%' | |
316 | # %d output value as in printf %d | |
317 | # %2 output value as in printf %2d | |
318 | # %3 output value as in printf %3d | |
319 | # %. output value as in printf %c | |
320 | # %+x add x to value, then do %. | |
321 | # | |
322 | # %>xy if value > x then add y, no output | |
323 | # %r reverse order of two parameters, no output | |
324 | # %i increment by one, no output | |
325 | # %B BCD (16*(value/10)) + (value%10), no output | |
326 | # | |
327 | # %n exclusive-or all parameters with 0140 (Datamedia 2500) | |
328 | # %D Reverse coding (value - 2*(value%16)), no output (Delta Data) | |
329 | # | |
cb1a09d0 AD |
330 | # $terminal->Tgoto($cap, $col, $row, $FH); |
331 | sub Tgoto { ## public | |
332 | my $self = shift; | |
333 | my($cap, $code, $tmp, $FH) = @_; | |
334 | my $string = $self->{'_' . $cap}; | |
335 | my $result = ''; | |
336 | my $after = ''; | |
337 | my $online = 0; | |
338 | my @tmp = ($tmp,$code); | |
339 | my $cnt = $code; | |
748a9306 | 340 | |
a687059c LW |
341 | while ($string =~ /^([^%]*)%(.)(.*)/) { |
342 | $result .= $1; | |
343 | $code = $2; | |
344 | $string = $3; | |
345 | if ($code eq 'd') { | |
9f68db38 | 346 | $result .= sprintf("%d",shift(@tmp)); |
a687059c LW |
347 | } |
348 | elsif ($code eq '.') { | |
9f68db38 | 349 | $tmp = shift(@tmp); |
a687059c LW |
350 | if ($tmp == 0 || $tmp == 4 || $tmp == 10) { |
351 | if ($online) { | |
cb1a09d0 | 352 | ++$tmp, $after .= $self->{'_up'} if $self->{'_up'}; |
a687059c LW |
353 | } |
354 | else { | |
cb1a09d0 | 355 | ++$tmp, $after .= $self->{'_bc'}; |
a687059c LW |
356 | } |
357 | } | |
358 | $result .= sprintf("%c",$tmp); | |
359 | $online = !$online; | |
360 | } | |
361 | elsif ($code eq '+') { | |
9f68db38 | 362 | $result .= sprintf("%c",shift(@tmp)+ord($string)); |
a687059c LW |
363 | $string = substr($string,1,99); |
364 | $online = !$online; | |
365 | } | |
366 | elsif ($code eq 'r') { | |
9f68db38 LW |
367 | ($code,$tmp) = @tmp; |
368 | @tmp = ($tmp,$code); | |
a687059c LW |
369 | $online = !$online; |
370 | } | |
371 | elsif ($code eq '>') { | |
372 | ($code,$tmp,$string) = unpack("CCa99",$string); | |
9f68db38 LW |
373 | if ($tmp[$[] > $code) { |
374 | $tmp[$[] += $tmp; | |
a687059c LW |
375 | } |
376 | } | |
377 | elsif ($code eq '2') { | |
9f68db38 | 378 | $result .= sprintf("%02d",shift(@tmp)); |
a687059c LW |
379 | $online = !$online; |
380 | } | |
381 | elsif ($code eq '3') { | |
9f68db38 | 382 | $result .= sprintf("%03d",shift(@tmp)); |
a687059c LW |
383 | $online = !$online; |
384 | } | |
385 | elsif ($code eq 'i') { | |
9f68db38 LW |
386 | ($code,$tmp) = @tmp; |
387 | @tmp = ($code+1,$tmp+1); | |
a687059c LW |
388 | } |
389 | else { | |
390 | return "OOPS"; | |
391 | } | |
392 | } | |
cb1a09d0 | 393 | $string = Tpad($self, $result . $string . $after, $cnt); |
748a9306 LW |
394 | print $FH $string if $FH; |
395 | $string; | |
396 | } | |
397 | ||
cb1a09d0 AD |
398 | # $terminal->Trequire(qw/ce ku kd/); |
399 | sub Trequire { ## public | |
400 | my $self = shift; | |
401 | my($cap,@undefined); | |
402 | foreach $cap (@_) { | |
403 | push(@undefined, $cap) | |
404 | unless defined $self->{'_' . $cap} && $self->{'_' . $cap}; | |
748a9306 | 405 | } |
cb1a09d0 | 406 | croak "Terminal does not support: (@undefined)" if @undefined; |
a687059c LW |
407 | } |
408 | ||
409 | 1; | |
cb1a09d0 | 410 |