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1 | package Term::Cap; |
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2 | use Carp; |
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3 | |
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4 | # Last updated: Thu Dec 14 20:02:42 CST 1995 by sanders@bsdi.com |
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5 | |
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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 |
107 | push(@termcap_path, $ENV{TERMCAP}) if $ENV{TERMCAP} =~ /^\//; |
108 | if ($ENV{TERMPATH}) { |
109 | # Add the users $TERMPATH |
110 | push(@termcap_path, split(/(:|\s+)/, $ENV{TERMPATH})) |
111 | } |
112 | else { |
113 | # Defaults |
114 | push(@termcap_path, |
115 | $ENV{'HOME'} . '/.termcap', |
116 | '/etc/termcap', |
117 | '/usr/share/misc/termcap', |
118 | ); |
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119 | } |
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120 | # return the list of those termcaps that exist |
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121 | grep(-f, @termcap_path); |
122 | } |
123 | |
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124 | sub Tgetent { ## public -- static method |
125 | my $class = shift; |
126 | my $self = bless shift, $class; |
127 | my($term,$cap,$search,$field,$max,$tmp_term,$TERMCAP); |
128 | local($termpat,$state,$first,$entry); # used inside eval |
129 | local $_; |
130 | |
131 | # Compute PADDING factor from OSPEED (to be used by Tpad) |
132 | if (! $self->{OSPEED}) { |
133 | carp "OSPEED was not set, defaulting to 9600"; |
134 | $self->{OSPEED} = 9600; |
135 | } |
136 | if ($self->{OSPEED} < 16) { |
137 | # delays for old style speeds |
138 | 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); |
139 | $self->{PADDING} = $pad[$self->{OSPEED}]; |
140 | } |
141 | else { |
142 | $self->{PADDING} = 10000 / $self->{OSPEED}; |
143 | } |
144 | |
145 | $self->{TERM} = ($self->{TERM} || $ENV{TERM} || croak "TERM not set"); |
146 | $term = $self->{TERM}; # $term is the term type we are looking for |
147 | |
148 | # $tmp_term is always the next term (possibly :tc=...:) we are looking for |
149 | $tmp_term = $self->{TERM}; |
150 | # protect any pattern metacharacters in $tmp_term |
151 | $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; |
152 | |
153 | my $foo = $ENV{TERMCAP}; |
154 | |
155 | # $entry is the extracted termcap entry |
156 | if (($foo !~ m:^/:) && ($foo =~ m/(^|\|)${termpat}[:|]/)) { |
157 | $entry = $foo; |
158 | } |
159 | |
160 | my @termcap_path = termcap_path; |
161 | croak "Can't find a valid termcap file" unless @termcap_path || $entry; |
162 | |
163 | $state = 1; # 0 == finished |
164 | # 1 == next file |
165 | # 2 == search again |
166 | |
167 | $first = 0; # first entry (keeps term name) |
168 | |
169 | $max = 32; # max :tc=...:'s |
170 | |
171 | if ($entry) { |
172 | # ok, we're starting with $TERMCAP |
173 | $first++; # we're the first entry |
174 | # do we need to continue? |
175 | if ($entry =~ s/:tc=([^:]+):/:/) { |
176 | $tmp_term = $1; |
177 | # protect any pattern metacharacters in $tmp_term |
178 | $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; |
179 | } |
180 | else { |
181 | $state = 0; # we're already finished |
182 | } |
183 | } |
184 | |
185 | # This is eval'ed inside the while loop for each file |
186 | $search = q{ |
187 | while ($_ = <TERMCAP>) { |
188 | next if /^\\t/ || /^#/; |
189 | if ($_ =~ m/(^|\\|)${termpat}[:|]/o) { |
190 | chomp; |
191 | s/^[^:]*:// if $first++; |
192 | $state = 0; |
193 | while ($_ =~ s/\\\\$//) { $_ .= <TERMCAP>; chomp; } |
194 | last; |
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195 | } |
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196 | } |
197 | $entry .= $_; |
198 | }; |
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199 | |
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200 | while ($state != 0) { |
201 | if ($state == 1) { |
202 | # get the next TERMCAP |
203 | $TERMCAP = shift @termcap_path |
204 | || croak "failed termcap lookup on $tmp_term"; |
205 | } |
206 | else { |
207 | # do the same file again |
208 | # prevent endless recursion |
209 | $max-- || croak "failed termcap loop at $tmp_term"; |
210 | $state = 1; # ok, maybe do a new file next time |
211 | } |
212 | |
213 | open(TERMCAP,"< $TERMCAP\0") || croak "open $TERMCAP: $!"; |
214 | eval $search; |
215 | die $@ if $@; |
216 | close TERMCAP; |
217 | |
218 | # If :tc=...: found then search this file again |
219 | $entry =~ s/:tc=([^:]+):/:/ && ($tmp_term = $1, $state = 2); |
220 | # protect any pattern metacharacters in $tmp_term |
221 | $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; |
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222 | } |
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223 | |
224 | croak "Can't find $term" if $entry eq ''; |
225 | $entry =~ s/:+\s*:+/:/g; # cleanup $entry |
226 | $entry =~ s/:+/:/g; # cleanup $entry |
227 | $self->{TERMCAP} = $entry; # save it |
228 | # print STDERR "DEBUG: $entry = ", $entry, "\n"; |
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229 | |
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230 | # Precompile $entry into the object |
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231 | $entry =~ s/^[^:]*://; |
748a9306 |
232 | foreach $field (split(/:[\s:\\]*/,$entry)) { |
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233 | if ($field =~ /^(\w\w)$/) { |
234 | $self->{'_' . $field} = 1 unless defined $self->{'_' . $1}; |
235 | # print STDERR "DEBUG: flag $1\n"; |
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236 | } |
237 | elsif ($field =~ /^(\w\w)\@/) { |
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238 | $self->{'_' . $1} = ""; |
239 | # print STDERR "DEBUG: unset $1\n"; |
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240 | } |
241 | elsif ($field =~ /^(\w\w)#(.*)/) { |
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242 | $self->{'_' . $1} = $2 unless defined $self->{'_' . $1}; |
243 | # print STDERR "DEBUG: numeric $1 = $2\n"; |
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244 | } |
245 | elsif ($field =~ /^(\w\w)=(.*)/) { |
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246 | # print STDERR "DEBUG: string $1 = $2\n"; |
247 | next if defined $self->{'_' . ($cap = $1)}; |
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248 | $_ = $2; |
249 | s/\\E/\033/g; |
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250 | s/\\(\d\d\d)/pack('c',oct($1) & 0177)/eg; |
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251 | s/\\n/\n/g; |
252 | s/\\r/\r/g; |
253 | s/\\t/\t/g; |
254 | s/\\b/\b/g; |
255 | s/\\f/\f/g; |
256 | s/\\\^/\377/g; |
257 | s/\^\?/\177/g; |
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258 | s/\^(.)/pack('c',ord($1) & 31)/eg; |
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259 | s/\\(.)/$1/g; |
260 | s/\377/^/g; |
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261 | $self->{'_' . $cap} = $_; |
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262 | } |
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263 | # else { carp "junk in $term ignored: $field"; } |
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264 | } |
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265 | $self->{'_pc'} = "\0" unless defined $self->{'_pc'}; |
266 | $self->{'_bc'} = "\b" unless defined $self->{'_bc'}; |
267 | $self; |
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268 | } |
269 | |
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270 | # $terminal->Tpad($string, $cnt, $FH); |
271 | sub Tpad { ## public |
272 | my $self = shift; |
273 | my($string, $cnt, $FH) = @_; |
274 | my($decr, $ms); |
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275 | |
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276 | if ($string =~ /(^[\d.]+)(\*?)(.*)$/) { |
277 | $ms = $1; |
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278 | $ms *= $cnt if $2; |
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279 | $string = $3; |
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280 | $decr = $self->{PADDING}; |
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281 | if ($decr > .1) { |
282 | $ms += $decr / 2; |
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283 | $string .= $self->{'_pc'} x ($ms / $decr); |
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284 | } |
285 | } |
286 | print $FH $string if $FH; |
287 | $string; |
288 | } |
289 | |
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290 | # $terminal->Tputs($cap, $cnt, $FH); |
291 | sub Tputs { ## public |
292 | my $self = shift; |
293 | my($cap, $cnt, $FH) = @_; |
294 | my $string; |
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295 | |
296 | if ($cnt > 1) { |
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297 | $string = Tpad($self, $self->{'_' . $cap}, $cnt); |
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298 | } else { |
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299 | # cache result because Tpad can be slow |
300 | $string = defined $self->{$cap} ? $self->{$cap} : |
301 | ($self->{$cap} = Tpad($self, $self->{'_' . $cap}, 1)); |
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302 | } |
303 | print $FH $string if $FH; |
304 | $string; |
305 | } |
306 | |
307 | # %% output `%' |
308 | # %d output value as in printf %d |
309 | # %2 output value as in printf %2d |
310 | # %3 output value as in printf %3d |
311 | # %. output value as in printf %c |
312 | # %+x add x to value, then do %. |
313 | # |
314 | # %>xy if value > x then add y, no output |
315 | # %r reverse order of two parameters, no output |
316 | # %i increment by one, no output |
317 | # %B BCD (16*(value/10)) + (value%10), no output |
318 | # |
319 | # %n exclusive-or all parameters with 0140 (Datamedia 2500) |
320 | # %D Reverse coding (value - 2*(value%16)), no output (Delta Data) |
321 | # |
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322 | # $terminal->Tgoto($cap, $col, $row, $FH); |
323 | sub Tgoto { ## public |
324 | my $self = shift; |
325 | my($cap, $code, $tmp, $FH) = @_; |
326 | my $string = $self->{'_' . $cap}; |
327 | my $result = ''; |
328 | my $after = ''; |
329 | my $online = 0; |
330 | my @tmp = ($tmp,$code); |
331 | my $cnt = $code; |
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332 | |
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333 | while ($string =~ /^([^%]*)%(.)(.*)/) { |
334 | $result .= $1; |
335 | $code = $2; |
336 | $string = $3; |
337 | if ($code eq 'd') { |
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338 | $result .= sprintf("%d",shift(@tmp)); |
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339 | } |
340 | elsif ($code eq '.') { |
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341 | $tmp = shift(@tmp); |
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342 | if ($tmp == 0 || $tmp == 4 || $tmp == 10) { |
343 | if ($online) { |
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344 | ++$tmp, $after .= $self->{'_up'} if $self->{'_up'}; |
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345 | } |
346 | else { |
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347 | ++$tmp, $after .= $self->{'_bc'}; |
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348 | } |
349 | } |
350 | $result .= sprintf("%c",$tmp); |
351 | $online = !$online; |
352 | } |
353 | elsif ($code eq '+') { |
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354 | $result .= sprintf("%c",shift(@tmp)+ord($string)); |
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355 | $string = substr($string,1,99); |
356 | $online = !$online; |
357 | } |
358 | elsif ($code eq 'r') { |
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359 | ($code,$tmp) = @tmp; |
360 | @tmp = ($tmp,$code); |
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361 | $online = !$online; |
362 | } |
363 | elsif ($code eq '>') { |
364 | ($code,$tmp,$string) = unpack("CCa99",$string); |
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365 | if ($tmp[$[] > $code) { |
366 | $tmp[$[] += $tmp; |
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367 | } |
368 | } |
369 | elsif ($code eq '2') { |
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370 | $result .= sprintf("%02d",shift(@tmp)); |
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371 | $online = !$online; |
372 | } |
373 | elsif ($code eq '3') { |
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374 | $result .= sprintf("%03d",shift(@tmp)); |
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375 | $online = !$online; |
376 | } |
377 | elsif ($code eq 'i') { |
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378 | ($code,$tmp) = @tmp; |
379 | @tmp = ($code+1,$tmp+1); |
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380 | } |
381 | else { |
382 | return "OOPS"; |
383 | } |
384 | } |
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385 | $string = Tpad($self, $result . $string . $after, $cnt); |
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386 | print $FH $string if $FH; |
387 | $string; |
388 | } |
389 | |
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390 | # $terminal->Trequire(qw/ce ku kd/); |
391 | sub Trequire { ## public |
392 | my $self = shift; |
393 | my($cap,@undefined); |
394 | foreach $cap (@_) { |
395 | push(@undefined, $cap) |
396 | unless defined $self->{'_' . $cap} && $self->{'_' . $cap}; |
748a9306 |
397 | } |
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398 | croak "Terminal does not support: (@undefined)" if @undefined; |
a687059c |
399 | } |
400 | |
401 | 1; |
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402 | |