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1 | #!./miniperl -w |
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2 | |
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3 | my $config_pm = $ARGV[0] || 'lib/Config.pm'; |
4 | my $glossary = $ARGV[1] || 'Porting/Glossary'; |
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5 | @ARGV = "./config.sh"; |
6 | |
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7 | # list names to put first (and hence lookup fastest) |
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8 | @fast = qw(archname osname osvers prefix libs libpth |
9 | dynamic_ext static_ext extensions dlsrc so |
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10 | sig_name sig_num cc ccflags cppflags |
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11 | privlibexp archlibexp installprivlib installarchlib |
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12 | sharpbang startsh shsharp |
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13 | ); |
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14 | |
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15 | # names of things which may need to have slashes changed to double-colons |
16 | @extensions = qw(dynamic_ext static_ext extensions known_extensions); |
17 | |
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18 | |
19 | open CONFIG, ">$config_pm" or die "Can't open $config_pm: $!\n"; |
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20 | $myver = $]; |
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21 | |
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22 | print CONFIG <<"ENDOFBEG"; |
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23 | package Config; |
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24 | use Exporter (); |
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25 | \@ISA = (Exporter); |
26 | \@EXPORT = qw(%Config); |
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27 | \@EXPORT_OK = qw(myconfig config_sh config_vars); |
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28 | |
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29 | \$] == $myver |
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30 | or die "Perl lib version ($myver) doesn't match executable version (\$])"; |
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31 | |
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32 | # This file was created by configpm when Perl was built. Any changes |
33 | # made to this file will be lost the next time perl is built. |
34 | |
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35 | ENDOFBEG |
36 | |
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37 | |
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38 | @fast{@fast} = @fast; |
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39 | @extensions{@extensions} = @extensions; |
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40 | @non_v=(); |
41 | @v_fast=(); |
42 | @v_others=(); |
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43 | $in_v = 0; |
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44 | |
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45 | while (<>) { |
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46 | next if m:^#!/bin/sh:; |
47 | # Catch CONFIG=true and PATCHLEVEL=n line from Configure. |
48 | s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/; |
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49 | unless ($in_v or m/^(\w+)='(.*\n)/){ |
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50 | push(@non_v, "#$_"); # not a name='value' line |
51 | next; |
52 | } |
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53 | if ($in_v) { $val .= $_; } |
54 | else { ($name,$val) = ($1,$2); } |
55 | $in_v = $val !~ /'\n/; |
56 | next if $in_v; |
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57 | if ($extensions{$name}) { s,/,::,g } |
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58 | if (!$fast{$name}){ push(@v_others, "$name='$val"); next; } |
59 | push(@v_fast,"$name='$val"); |
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60 | } |
61 | |
62 | foreach(@non_v){ print CONFIG $_ } |
63 | |
64 | print CONFIG "\n", |
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65 | "my \$config_sh = <<'!END!';\n", |
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66 | join("", @v_fast, sort @v_others), |
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67 | "!END!\n\n"; |
68 | |
69 | # copy config summary format from the myconfig script |
70 | |
71 | print CONFIG "my \$summary = <<'!END!';\n"; |
72 | |
73 | open(MYCONFIG,"<myconfig") || die "open myconfig failed: $!"; |
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74 | 1 while defined($_ = <MYCONFIG>) && !/^Summary of/; |
75 | do { print CONFIG $_ } until !defined($_ = <MYCONFIG>) || /^\s*$/; |
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76 | close(MYCONFIG); |
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77 | |
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78 | print CONFIG "\n!END!\n", <<'EOT'; |
79 | my $summary_expanded = 0; |
80 | |
81 | sub myconfig { |
82 | return $summary if $summary_expanded; |
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83 | $summary =~ s{\$(\w+)} |
84 | { my $c = $Config{$1}; defined($c) ? $c : 'undef' }ge; |
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85 | $summary_expanded = 1; |
86 | $summary; |
87 | } |
88 | EOT |
89 | |
90 | # ---- |
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91 | |
92 | print CONFIG <<'ENDOFEND'; |
93 | |
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94 | sub FETCH { |
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95 | # check for cached value (which may be undef so we use exists not defined) |
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96 | return $_[0]->{$_[1]} if (exists $_[0]->{$_[1]}); |
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97 | |
98 | # Search for it in the big string |
99 | my($value, $start, $marker); |
100 | $marker = "$_[1]='"; |
101 | # return undef unless (($value) = $config_sh =~ m/^$_[1]='(.*)'\s*$/m); |
102 | $start = index($config_sh, "\n$marker"); |
103 | return undef if ( ($start == -1) && # in case it's first |
104 | (substr($config_sh, 0, length($marker)) ne $marker) ); |
105 | if ($start == -1) { $start = length($marker) } |
106 | else { $start += length($marker) + 1 } |
107 | $value = substr($config_sh, $start, |
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108 | index($config_sh, qq('\n), $start) - $start); |
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109 | |
110 | $value = undef if $value eq 'undef'; # So we can say "if $Config{'foo'}". |
111 | $_[0]->{$_[1]} = $value; # cache it |
112 | return $value; |
113 | } |
114 | |
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115 | my $prevpos = 0; |
116 | |
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117 | sub FIRSTKEY { |
118 | $prevpos = 0; |
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119 | # my($key) = $config_sh =~ m/^(.*?)=/; |
120 | substr($config_sh, 0, index($config_sh, '=') ); |
121 | # $key; |
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122 | } |
123 | |
124 | sub NEXTKEY { |
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125 | my $pos = index($config_sh, qq('\n), $prevpos) + 2; |
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126 | my $len = index($config_sh, "=", $pos) - $pos; |
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127 | $prevpos = $pos; |
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128 | $len > 0 ? substr($config_sh, $pos, $len) : undef; |
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129 | } |
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130 | |
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131 | sub EXISTS { |
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132 | # exists($_[0]->{$_[1]}) or $config_sh =~ m/^$_[1]=/m; |
133 | exists($_[0]->{$_[1]}) or |
134 | index($config_sh, "\n$_[1]='") != -1 or |
135 | substr($config_sh, 0, length($_[1])+2) eq "$_[1]='"; |
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136 | } |
137 | |
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138 | sub STORE { die "\%Config::Config is read-only\n" } |
139 | sub DELETE { &STORE } |
140 | sub CLEAR { &STORE } |
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141 | |
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142 | |
143 | sub config_sh { |
144 | $config_sh |
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145 | } |
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146 | |
147 | sub config_re { |
148 | my $re = shift; |
149 | my @matches = ($config_sh =~ /^$re=.*\n/mg); |
150 | @matches ? (print @matches) : print "$re: not found\n"; |
151 | } |
152 | |
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153 | sub config_vars { |
154 | foreach(@_){ |
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155 | config_re($_), next if /\W/; |
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156 | my $v=(exists $Config{$_}) ? $Config{$_} : 'UNKNOWN'; |
157 | $v='undef' unless defined $v; |
158 | print "$_='$v';\n"; |
159 | } |
160 | } |
161 | |
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162 | ENDOFEND |
163 | |
164 | if ($^O eq 'os2') { |
165 | print CONFIG <<'ENDOFSET'; |
166 | my %preconfig; |
167 | if ($OS2::is_aout) { |
168 | my ($value, $v) = $config_sh =~ m/^used_aout='(.*)'\s*$/m; |
169 | for (split ' ', $value) { |
170 | ($v) = $config_sh =~ m/^aout_$_='(.*)'\s*$/m; |
171 | $preconfig{$_} = $v eq 'undef' ? undef : $v; |
172 | } |
173 | } |
174 | sub TIEHASH { bless {%preconfig} } |
175 | ENDOFSET |
176 | } else { |
177 | print CONFIG <<'ENDOFSET'; |
178 | sub TIEHASH { bless {} } |
179 | ENDOFSET |
180 | } |
181 | |
182 | print CONFIG <<'ENDOFTAIL'; |
183 | |
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184 | # avoid Config..Exporter..UNIVERSAL search for DESTROY then AUTOLOAD |
185 | sub DESTROY { } |
186 | |
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187 | tie %Config, 'Config'; |
188 | |
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189 | 1; |
190 | __END__ |
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191 | |
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192 | =head1 NAME |
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193 | |
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194 | Config - access Perl configuration information |
195 | |
196 | =head1 SYNOPSIS |
197 | |
198 | use Config; |
199 | if ($Config{'cc'} =~ /gcc/) { |
200 | print "built by gcc\n"; |
201 | } |
202 | |
203 | use Config qw(myconfig config_sh config_vars); |
204 | |
205 | print myconfig(); |
206 | |
207 | print config_sh(); |
208 | |
209 | config_vars(qw(osname archname)); |
210 | |
211 | |
212 | =head1 DESCRIPTION |
213 | |
214 | The Config module contains all the information that was available to |
215 | the C<Configure> program at Perl build time (over 900 values). |
216 | |
217 | Shell variables from the F<config.sh> file (written by Configure) are |
218 | stored in the readonly-variable C<%Config>, indexed by their names. |
219 | |
220 | Values stored in config.sh as 'undef' are returned as undefined |
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221 | values. The perl C<exists> function can be used to check if a |
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222 | named variable exists. |
223 | |
224 | =over 4 |
225 | |
226 | =item myconfig() |
227 | |
228 | Returns a textual summary of the major perl configuration values. |
229 | See also C<-V> in L<perlrun/Switches>. |
230 | |
231 | =item config_sh() |
232 | |
233 | Returns the entire perl configuration information in the form of the |
234 | original config.sh shell variable assignment script. |
235 | |
236 | =item config_vars(@names) |
237 | |
238 | Prints to STDOUT the values of the named configuration variable. Each is |
239 | printed on a separate line in the form: |
240 | |
241 | name='value'; |
242 | |
243 | Names which are unknown are output as C<name='UNKNOWN';>. |
244 | See also C<-V:name> in L<perlrun/Switches>. |
245 | |
246 | =back |
247 | |
248 | =head1 EXAMPLE |
249 | |
250 | Here's a more sophisticated example of using %Config: |
251 | |
252 | use Config; |
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253 | use strict; |
254 | |
255 | my %sig_num; |
256 | my @sig_name; |
257 | unless($Config{sig_name} && $Config{sig_num}) { |
258 | die "No sigs?"; |
259 | } else { |
260 | my @names = split ' ', $Config{sig_name}; |
261 | @sig_num{@names} = split ' ', $Config{sig_num}; |
262 | foreach (@names) { |
263 | $sig_name[$sig_num{$_}] ||= $_; |
264 | } |
265 | } |
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266 | |
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267 | print "signal #17 = $sig_name[17]\n"; |
268 | if ($sig_num{ALRM}) { |
269 | print "SIGALRM is $sig_num{ALRM}\n"; |
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270 | } |
271 | |
272 | =head1 WARNING |
273 | |
274 | Because this information is not stored within the perl executable |
275 | itself it is possible (but unlikely) that the information does not |
276 | relate to the actual perl binary which is being used to access it. |
277 | |
278 | The Config module is installed into the architecture and version |
279 | specific library directory ($Config{installarchlib}) and it checks the |
280 | perl version number when loaded. |
281 | |
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282 | =head1 GLOSSARY |
283 | |
284 | Most C<Config> variables are determined by the C<Configure> script |
285 | on platforms supported by it (which is most UNIX platforms). Some |
286 | platforms have custom-made C<Config> variables, and may thus not have |
287 | some of the variables described below, or may have extraneous variables |
288 | specific to that particular port. See the port specific documentation |
289 | in such cases. |
290 | |
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291 | ENDOFTAIL |
292 | |
293 | open(GLOS, "<$glossary") or die "Can't open $glossary: $!"; |
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294 | %seen = (); |
295 | $text = 0; |
296 | $/ = ''; |
297 | |
298 | sub process { |
299 | s/\A(\w*)\s+\(([\w.]+)\):\s*\n(\t?)/=item C<$1>\n\nFrom F<$2>:\n\n/m; |
300 | my $c = substr $1, 0, 1; |
301 | unless ($seen{$c}++) { |
302 | print CONFIG <<EOF if $text; |
303 | =back |
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304 | |
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305 | EOF |
306 | print CONFIG <<EOF; |
307 | =head2 $c |
308 | |
309 | =over |
310 | |
311 | EOF |
312 | $text = 1; |
313 | } |
314 | s/n't/n\00t/g; # leave can't, won't etc untouched |
315 | s/^\t\s+(.*)/\n\t$1\n/gm; # Indented lines ===> paragraphs |
316 | s/^(?<!\n\n)\t(.*)/$1/gm; # Not indented lines ===> text |
317 | s{([\'\"])(?=[^\'\"\s]*[./][^\'\"\s]*\1)([^\'\"\s]+)\1}(F<$2>)g; # '.o' |
318 | s{([\'\"])([^\'\"\s]+)\1}(C<$2>)g; # "date" command |
319 | s{\'([A-Za-z_\- *=/]+)\'}(C<$1>)g; # 'ln -s' |
320 | s{ |
321 | (?<! [\w./<\'\"] ) # Only standalone file names |
322 | (?! e \. g \. ) # Not e.g. |
323 | (?! \. \. \. ) # Not ... |
324 | (?! \d ) # Not 5.004 |
325 | ( [\w./]* [./] [\w./]* ) # Require . or / inside |
326 | (?<! \. (?= \s ) ) # Do not include trailing dot |
327 | (?! [\w/] ) # Include all of it |
328 | } |
329 | (F<$1>)xg; # /usr/local |
330 | s/((?<=\s)~\w*)/F<$1>/g; # ~name |
331 | s/(?<![.<\'\"])\b([A-Z_]{2,})\b(?![\'\"])/C<$1>/g; # UNISTD |
332 | s/(?<![.<\'\"])\b(?!the\b)(\w+)\s+macro\b/C<$1> macro/g; # FILE_cnt macro |
333 | s/n[\0]t/n't/g; # undo can't, won't damage |
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334 | } |
335 | |
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336 | <GLOS>; # Skip the preamble |
337 | while (<GLOS>) { |
338 | process; |
339 | print CONFIG; |
340 | } |
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341 | |
342 | print CONFIG <<'ENDOFTAIL'; |
343 | |
344 | =back |
345 | |
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346 | =head1 NOTE |
347 | |
348 | This module contains a good example of how to use tie to implement a |
349 | cache and an example of how to make a tied variable readonly to those |
350 | outside of it. |
351 | |
352 | =cut |
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353 | |
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354 | ENDOFTAIL |
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355 | |
356 | close(CONFIG); |
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357 | close(GLOS); |
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358 | |
359 | # Now do some simple tests on the Config.pm file we have created |
360 | unshift(@INC,'lib'); |
361 | require $config_pm; |
362 | import Config; |
363 | |
364 | die "$0: $config_pm not valid" |
365 | unless $Config{'CONFIG'} eq 'true'; |
366 | |
367 | die "$0: error processing $config_pm" |
368 | if defined($Config{'an impossible name'}) |
369 | or $Config{'CONFIG'} ne 'true' # test cache |
370 | ; |
371 | |
372 | die "$0: error processing $config_pm" |
373 | if eval '$Config{"cc"} = 1' |
374 | or eval 'delete $Config{"cc"}' |
375 | ; |
376 | |
377 | |
85e6fe83 |
378 | exit 0; |