1package FindExt;
2
3our $VERSION = '1.01';
4
5use strict;
6use warnings;
7
8my $no = join('|',qw(GDBM_File ODBM_File NDBM_File DB_File
9		     Syslog SysV Langinfo));
10$no = qr/^(?:$no)$/i;
11
12my %ext;
13my $ext;
14my %static;
15
16sub getcwd {
17    $ENV{'PWD'} = Win32::GetCwd();
18    $ENV{'PWD'} =~ s:\\:/:g ;
19    return $ENV{'PWD'};
20}
21
22sub set_static_extensions
23{
24    # adjust results of scan_ext, and also save
25    # statics in case scan_ext hasn't been called yet.
26    %static = ();
27    for (@_) {
28        $static{$_} = 1;
29        $ext{$_} = 'static' if $ext{$_} && $ext{$_} eq 'dynamic';
30    }
31}
32
33sub scan_ext
34{
35 my $here = getcwd();
36 my $dir  = shift;
37 chdir($dir) || die "Cannot cd to $dir\n";
38 ($ext = getcwd()) =~ s,/,\\,g;
39 find_ext('');
40 chdir($here) || die "Cannot cd to $here\n";
41 my @ext = extensions();
42}
43
44sub dynamic_ext
45{
46 return sort grep $ext{$_} eq 'dynamic',keys %ext;
47}
48
49sub static_ext
50{
51 return sort grep $ext{$_} eq 'static',keys %ext;
52}
53
54sub nonxs_ext
55{
56 return sort grep $ext{$_} eq 'nonxs',keys %ext;
57}
58
59sub extensions
60{
61 return sort grep $ext{$_} ne 'known',keys %ext;
62}
63
64sub known_extensions
65{
66 # faithfully copy Configure in not including nonxs extensions for the nonce
67 return sort grep $ext{$_} ne 'nonxs',keys %ext;
68}
69
70sub is_static
71{
72 return $ext{$_[0]} eq 'static'
73}
74
75# Function to recursively find available extensions, ignoring DynaLoader
76# NOTE: recursion limit of 10 to prevent runaway in case of symlink madness
77sub find_ext
78{
79    opendir my $dh, '.';
80    my @items = grep { !/^\.\.?$/ } readdir $dh;
81    closedir $dh;
82    for my $xxx (@items) {
83        if ($xxx ne "DynaLoader") {
84            if (-f "$xxx/$xxx.xs") {
85                $ext{"$_[0]$xxx"} = $static{"$_[0]$xxx"} ? 'static' : 'dynamic';
86            } elsif (-f "$xxx/Makefile.PL") {
87                $ext{"$_[0]$xxx"} = 'nonxs';
88            } else {
89                if (-d $xxx && @_ < 10) {
90                    chdir $xxx;
91                    find_ext("$_[0]$xxx/", @_);
92                    chdir "..";
93                }
94            }
95            $ext{"$_[0]$xxx"} = 'known' if $ext{"$_[0]$xxx"} && $xxx =~ $no;
96        }
97    }
98
99# Special case:  Add in threads/shared since it is not picked up by the
100# recursive find above (and adding in general recursive finding breaks
101# SDBM_File/sdbm).  A.D.  10/25/2001.
102
103    if (!$_[0] && -d "threads/shared") {
104        $ext{"threads/shared"} = 'dynamic';
105    }
106}
107
1081;
109