#!./miniperl -w my $config_pm = $ARGV[0] || 'lib/Config.pm'; my $glossary = $ARGV[1] || 'Porting/Glossary'; @ARGV = "./config.sh"; # list names to put first (and hence lookup fastest) @fast = qw(archname osname osvers prefix libs libpth dynamic_ext static_ext extensions dlsrc so sig_name sig_num cc ccflags cppflags privlibexp archlibexp installprivlib installarchlib sharpbang startsh shsharp ); # names of things which may need to have slashes changed to double-colons @extensions = qw(dynamic_ext static_ext extensions known_extensions); open CONFIG, ">$config_pm" or die "Can't open $config_pm: $!\n"; $myver = $]; print CONFIG <<'ENDOFBEG_NOQ', <<"ENDOFBEG"; package Config; use Exporter (); @EXPORT = qw(%Config); @EXPORT_OK = qw(myconfig config_sh config_vars); # Define our own import method to avoid pulling in the full Exporter: sub import { my $pkg = shift; @_ = @EXPORT unless @_; my @func = grep {$_ ne '%Config'} @_; local $Exporter::ExportLevel = 1; Exporter::import('Config', @func) if @func; return if @func == @_; my $callpkg = caller(0); *{"$callpkg\::Config"} = \%Config; } ENDOFBEG_NOQ \$] == $myver or die "Perl lib version ($myver) doesn't match executable version (\$])"; # This file was created by configpm when Perl was built. Any changes # made to this file will be lost the next time perl is built. ENDOFBEG @fast{@fast} = @fast; @extensions{@extensions} = @extensions; @non_v=(); @v_fast=(); @v_others=(); $in_v = 0; while (<>) { next if m:^#!/bin/sh:; # Catch CONFIGDOTSH=true and PERL_VERSION=n line from Configure. s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/; my ($k,$v) = ($1,$2); # grandfather PATCHLEVEL and SUBVERSION and CONFIG if ($k) { if ($k eq 'PERL_VERSION') { push @v_others, "PATCHLEVEL='$v'\n"; } elsif ($k eq 'PERL_SUBVERSION') { push @v_others, "SUBVERSION='$v'\n"; } elsif ($k eq 'CONFIGDOTSH') { push @v_others, "CONFIG='$v'\n"; } } # We can delimit things in config.sh with either ' or ". unless ($in_v or m/^(\w+)=(['"])(.*\n)/){ push(@non_v, "#$_"); # not a name='value' line next; } $quote = $2; if ($in_v) { $val .= $_; } else { ($name,$val) = ($1,$3); } $in_v = $val !~ /$quote\n/; next if $in_v; if ($extensions{$name}) { s,/,::,g } if (!$fast{$name}){ push(@v_others, "$name=$quote$val"); next; } push(@v_fast,"$name=$quote$val"); } foreach(@non_v){ print CONFIG $_ } print CONFIG "\n", "my \$config_sh = <<'!END!';\n", join("", @v_fast, sort @v_others), "!END!\n\n"; # copy config summary format from the myconfig.SH script print CONFIG "my \$summary = <<'!END!';\n"; open(MYCONFIG,") && !/^Summary of/; do { print CONFIG $_ } until !defined($_ = ) || /^\s*$/; close(MYCONFIG); print CONFIG "\n!END!\n", <<'EOT'; my $summary_expanded = 0; sub myconfig { return $summary if $summary_expanded; $summary =~ s{\$(\w+)} { my $c = $Config{$1}; defined($c) ? $c : 'undef' }ge; $summary_expanded = 1; $summary; } EOT # ---- print CONFIG <<'ENDOFEND'; sub FETCH { # check for cached value (which may be undef so we use exists not defined) return $_[0]->{$_[1]} if (exists $_[0]->{$_[1]}); # Search for it in the big string my($value, $start, $marker, $quote_type); $marker = "$_[1]="; $quote_type = "'"; # return undef unless (($value) = $config_sh =~ m/^$_[1]='(.*)'\s*$/m); # Check for the common case, ' delimeted $start = index($config_sh, "\n$marker$quote_type"); # If that failed, check for " delimited if ($start == -1) { $quote_type = '"'; $start = index($config_sh, "\n$marker$quote_type"); } return undef if ( ($start == -1) && # in case it's first (substr($config_sh, 0, length($marker)) ne $marker) ); if ($start == -1) { # It's the very first thing we found. Skip $start forward # and figure out the quote mark after the =. $start = length($marker) + 1; $quote_type = substr($config_sh, $start - 1, 1); } else { $start += length($marker) + 2; } $value = substr($config_sh, $start, index($config_sh, "$quote_type\n", $start) - $start); # If we had a double-quote, we'd better eval it so escape # sequences and such can be interpolated. Since the incoming # value is supposed to follow shell rules and not perl rules, # we escape any perl variable markers if ($quote_type eq '"') { $value =~ s/\$/\\\$/g; $value =~ s/\@/\\\@/g; eval "\$value = \"$value\""; } #$value = sprintf($value) if $quote_type eq '"'; $value = undef if $value eq 'undef'; # So we can say "if $Config{'foo'}". $_[0]->{$_[1]} = $value; # cache it return $value; } my $prevpos = 0; sub FIRSTKEY { $prevpos = 0; # my($key) = $config_sh =~ m/^(.*?)=/; substr($config_sh, 0, index($config_sh, '=') ); # $key; } sub NEXTKEY { # Find out how the current key's quoted so we can skip to its end. my $quote = substr($config_sh, index($config_sh, "=", $prevpos)+1, 1); my $pos = index($config_sh, qq($quote\n), $prevpos) + 2; my $len = index($config_sh, "=", $pos) - $pos; $prevpos = $pos; $len > 0 ? substr($config_sh, $pos, $len) : undef; } sub EXISTS { # exists($_[0]->{$_[1]}) or $config_sh =~ m/^$_[1]=/m; exists($_[0]->{$_[1]}) or index($config_sh, "\n$_[1]='") != -1 or substr($config_sh, 0, length($_[1])+2) eq "$_[1]='" or index($config_sh, "\n$_[1]=\"") != -1 or substr($config_sh, 0, length($_[1])+2) eq "$_[1]=\""; } sub STORE { die "\%Config::Config is read-only\n" } sub DELETE { &STORE } sub CLEAR { &STORE } sub config_sh { $config_sh } sub config_re { my $re = shift; my @matches = ($config_sh =~ /^$re=.*\n/mg); @matches ? (print @matches) : print "$re: not found\n"; } sub config_vars { foreach(@_){ config_re($_), next if /\W/; my $v=(exists $Config{$_}) ? $Config{$_} : 'UNKNOWN'; $v='undef' unless defined $v; print "$_='$v';\n"; } } ENDOFEND if ($^O eq 'os2') { print CONFIG <<'ENDOFSET'; my %preconfig; if ($OS2::is_aout) { my ($value, $v) = $config_sh =~ m/^used_aout='(.*)'\s*$/m; for (split ' ', $value) { ($v) = $config_sh =~ m/^aout_$_='(.*)'\s*$/m; $preconfig{$_} = $v eq 'undef' ? undef : $v; } } sub TIEHASH { bless {%preconfig} } ENDOFSET } else { print CONFIG <<'ENDOFSET'; sub TIEHASH { bless {} } ENDOFSET } print CONFIG <<'ENDOFTAIL'; # avoid Config..Exporter..UNIVERSAL search for DESTROY then AUTOLOAD sub DESTROY { } tie %Config, 'Config'; 1; __END__ =head1 NAME Config - access Perl configuration information =head1 SYNOPSIS use Config; if ($Config{'cc'} =~ /gcc/) { print "built by gcc\n"; } use Config qw(myconfig config_sh config_vars); print myconfig(); print config_sh(); config_vars(qw(osname archname)); =head1 DESCRIPTION The Config module contains all the information that was available to the C program at Perl build time (over 900 values). Shell variables from the F file (written by Configure) are stored in the readonly-variable C<%Config>, indexed by their names. Values stored in config.sh as 'undef' are returned as undefined values. The perl C function can be used to check if a named variable exists. =over 4 =item myconfig() Returns a textual summary of the major perl configuration values. See also C<-V> in L. =item config_sh() Returns the entire perl configuration information in the form of the original config.sh shell variable assignment script. =item config_vars(@names) Prints to STDOUT the values of the named configuration variable. Each is printed on a separate line in the form: name='value'; Names which are unknown are output as C. See also C<-V:name> in L. =back =head1 EXAMPLE Here's a more sophisticated example of using %Config: use Config; use strict; my %sig_num; my @sig_name; unless($Config{sig_name} && $Config{sig_num}) { die "No sigs?"; } else { my @names = split ' ', $Config{sig_name}; @sig_num{@names} = split ' ', $Config{sig_num}; foreach (@names) { $sig_name[$sig_num{$_}] ||= $_; } } print "signal #17 = $sig_name[17]\n"; if ($sig_num{ALRM}) { print "SIGALRM is $sig_num{ALRM}\n"; } =head1 WARNING Because this information is not stored within the perl executable itself it is possible (but unlikely) that the information does not relate to the actual perl binary which is being used to access it. The Config module is installed into the architecture and version specific library directory ($Config{installarchlib}) and it checks the perl version number when loaded. The values stored in config.sh may be either single-quoted or double-quoted. Double-quoted strings are handy for those cases where you need to include escape sequences in the strings. To avoid runtime variable interpolation, any C<$> and C<@> characters are replaced by C<\$> and C<\@>, respectively. This isn't foolproof, of course, so don't embed C<\$> or C<\@> in double-quoted strings unless you're willing to deal with the consequences. (The slashes will end up escaped and the C<$> or C<@> will trigger variable interpolation) =head1 GLOSSARY Most C variables are determined by the C script on platforms supported by it (which is most UNIX platforms). Some platforms have custom-made C variables, and may thus not have some of the variables described below, or may have extraneous variables specific to that particular port. See the port specific documentation in such cases. ENDOFTAIL open(GLOS, "<$glossary") or die "Can't open $glossary: $!"; %seen = (); $text = 0; $/ = ''; sub process { s/\A(\w*)\s+\(([\w.]+)\):\s*\n(\t?)/=item C<$1>\n\nFrom F<$2>:\n\n/m; my $c = substr $1, 0, 1; unless ($seen{$c}++) { print CONFIG < paragraphs s/^(? text s{([\'\"])(?=[^\'\"\s]*[./][^\'\"\s]*\1)([^\'\"\s]+)\1}(F<$2>)g; # '.o' s{([\'\"])([^\'\"\s]+)\1}(C<$2>)g; # "date" command s{\'([A-Za-z_\- *=/]+)\'}(C<$1>)g; # 'ln -s' s{ (?)xg; # /usr/local s/((?<=\s)~\w*)/F<$1>/g; # ~name s/(?/g; # UNISTD s/(? macro/g; # FILE_cnt macro s/n[\0]t/n't/g; # undo can't, won't damage } ; # Skip the preamble while () { process; print CONFIG; } print CONFIG <<'ENDOFTAIL'; =back =head1 NOTE This module contains a good example of how to use tie to implement a cache and an example of how to make a tied variable readonly to those outside of it. =cut ENDOFTAIL close(CONFIG); close(GLOS); # Now do some simple tests on the Config.pm file we have created unshift(@INC,'lib'); require $config_pm; import Config; die "$0: $config_pm not valid" unless $Config{'CONFIGDOTSH'} eq 'true'; die "$0: error processing $config_pm" if defined($Config{'an impossible name'}) or $Config{'CONFIGDOTSH'} ne 'true' # test cache ; die "$0: error processing $config_pm" if eval '$Config{"cc"} = 1' or eval 'delete $Config{"cc"}' ; exit 0;