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