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1 | #!/usr/bin/perl -w |
2 | use strict; |
3 | use vars qw($Is_W32 $Is_OS2 $Is_Cygwin $Is_NetWare $Needs_Write); |
4 | use Config; # Remember, this is running using an existing perl |
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5 | use File::Compare; |
6 | use Symbol; |
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7 | |
8 | # Common functions needed by the regen scripts |
9 | |
10 | $Is_W32 = $^O eq 'MSWin32'; |
11 | $Is_OS2 = $^O eq 'os2'; |
12 | $Is_Cygwin = $^O eq 'cygwin'; |
13 | $Is_NetWare = $Config{osname} eq 'NetWare'; |
14 | if ($Is_NetWare) { |
15 | $Is_W32 = 0; |
16 | } |
17 | |
18 | $Needs_Write = $Is_OS2 || $Is_W32 || $Is_Cygwin || $Is_NetWare; |
19 | |
20 | sub safer_unlink { |
21 | my @names = @_; |
22 | my $cnt = 0; |
23 | |
24 | my $name; |
25 | foreach $name (@names) { |
26 | next unless -e $name; |
27 | chmod 0777, $name if $Needs_Write; |
28 | ( CORE::unlink($name) and ++$cnt |
29 | or warn "Couldn't unlink $name: $!\n" ); |
30 | } |
31 | return $cnt; |
32 | } |
33 | |
34 | sub safer_rename_silent { |
35 | my ($from, $to) = @_; |
36 | |
37 | # Some dosish systems can't rename over an existing file: |
38 | safer_unlink $to; |
39 | chmod 0600, $from if $Needs_Write; |
40 | rename $from, $to; |
41 | } |
42 | |
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43 | sub rename_if_different { |
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44 | my ($from, $to) = @_; |
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45 | |
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46 | if (compare($from, $to) == 0) { |
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47 | warn "no changes between '$from' & '$to'\n"; |
48 | safer_unlink($from); |
49 | return; |
50 | } |
51 | warn "changed '$from' to '$to'\n"; |
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52 | safer_rename_silent($from, $to) or die "renaming $from to $to: $!"; |
53 | } |
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54 | |
55 | # Saf*er*, but not totally safe. And assumes always open for output. |
56 | sub safer_open { |
57 | my $name = shift; |
58 | my $fh = gensym; |
59 | open $fh, ">$name" or die "Can't create $name: $!"; |
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60 | *{$fh}->{SCALAR} = $name; |
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61 | binmode $fh; |
62 | $fh; |
63 | } |
64 | |
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65 | sub safer_close { |
66 | my $fh = shift; |
67 | close $fh or die 'Error closing ' . *{$fh}->{SCALAR} . ": $!"; |
68 | } |
69 | |
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70 | 1; |