1 files changed, 53 insertions, 0 deletions
diff --git a/install-win32/ifdef.pl b/install-win32/ifdef.pl
new file mode 100644
index 0000000..d240ebb
--- /dev/null
+++ b/install-win32/ifdef.pl
@@ -0,0 +1,53 @@
+#!/usr/bin/perl
+
+# Simple ifdef/else/endif processor.
+
+die "usage: ifdef [-C<command-prefix>] [-Dname ...] [control-file ...] " if (@ARGV[0] =~ /^(-h|--help)$/);
+
+%Parms = ();
+
+$pre = "!";
+while ($arg=shift(@ARGV)) {
+    if ($arg =~ /^-/) {
+	if ($arg =~ /^-D(\w+)$/) {
+	    $Parms{$1} = 1;
+	} elsif ($arg =~ /-C(.*)$/) {
+	  $pre = $1;
+	} else {
+	    die "unrecognized option: $arg";
+	}
+    } else {
+	open(CONTROL, "< $arg") or die "cannot open $arg";
+	while (<CONTROL>) {
+	    if (/^!define\s+(\w+)/) {
+                $Parms{$1} = 1;
+            }
+        }
+    }
+}
+
+sub ifdef {
+  my ($var, $enabled) = @_;
+  my $def = 0;
+  $def = 1 if (defined $Parms{$var}) || ($var eq "true");
+  $def = 0 if $var eq "false";
+  while (<STDIN>) {
+    if (/^\s*\Q$pre\Eifdef\s+(\w+)\s*$/) {
+      return 1 if ifdef ($1, $def & $enabled);
+    } elsif (/^\s*\Q$pre\Eelseif\s+(\w+)\s*$/) {
+      $def = $def ^ 1;
+      return ifdef ($1, $def & $enabled);
+    } elsif (/^\s*\Q$pre\Eelse\s*$/) {
+      $def = $def ^ 1;
+    } elsif (/^\s*\Q$pre\Eendif\s*$/) {
+      return 0;
+    } elsif (/^\s*\Q$pre\E/) {
+      die "unrecognized command: $_";
+    } else {
+      print if $def && $enabled;
+    }
+  }
+  return 1;
+}
+
+ifdef("true", 1);