regen_headers tiny tidying:

- regen.pl renamed as regen_lib.pl
- regen_headers.pl renamed as regen.pl
- added make target 'regen' (kept target 'regen_headers'
  for porters' brains' backward compatibility)
- regen.pl fancified a bit to display the names
  of the files that got changed by running the scripts

p4raw-id: //depot/perl@18851

1 files changed, 45 insertions, 0 deletions

diff --git a/regen_lib.pl b/regen_lib.pl
new file mode 100644
index 0000000000..1c830a2cdc
--- /dev/null
+++ b/regen_lib.pl
@@ -0,0 +1,45 @@
+#!/usr/bin/perl -w
+use strict;
+use vars qw($Is_W32 $Is_OS2 $Is_Cygwin $Is_NetWare $Needs_Write);
+use Config; # Remember, this is running using an existing perl
+
+# Common functions needed by the regen scripts
+
+$Is_W32 = $^O eq 'MSWin32';
+$Is_OS2 = $^O eq 'os2';
+$Is_Cygwin = $^O eq 'cygwin';
+$Is_NetWare = $Config{osname} eq 'NetWare';
+if ($Is_NetWare) {
+  $Is_W32 = 0;
+}
+
+$Needs_Write = $Is_OS2 || $Is_W32 || $Is_Cygwin || $Is_NetWare;
+
+sub safer_unlink {
+  my @names = @_;
+  my $cnt = 0;
+
+  my $name;
+  foreach $name (@names) {
+    next unless -e $name;
+    chmod 0777, $name if $Needs_Write;
+    ( CORE::unlink($name) and ++$cnt
+      or warn "Couldn't unlink $name: $!\n" );
+  }
+  return $cnt;
+}
+
+sub safer_rename_silent {
+  my ($from, $to) = @_;
+
+  # Some dosish systems can't rename over an existing file:
+  safer_unlink $to;
+  chmod 0600, $from if $Needs_Write;
+  rename $from, $to;
+}
+
+sub safer_rename {
+  my ($from, $to) = @_;
+  safer_rename_silent($from, $to) or die "renaming $from to $to: $!";
+}
+1;