1 files changed, 50 insertions, 0 deletions
diff --git a/maintainer/check-perl-protos b/maintainer/check-perl-protos
new file mode 100755
index 000000000..9839f6b11
--- /dev/null
+++ b/maintainer/check-perl-protos
@@ -0,0 +1,50 @@
+#!/usr/bin/env perl
+#
+# Copyright (C) 2017-2018 Free Software Foundation, Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use warnings;
+use strict;
+
+my @lines = <>;
+my %forwards = map { /^sub (\w+)\s*\((.*)\);$/ ? ("$1" => "$2") : () } @lines;
+my %subs = map { /^sub (\w+)\s*\((.*)\)$/ ? ("$1" => "$2") : () } @lines;
+my $error_count = 0;
+
+# $subs{"foo"} = "$$";
+# $subs{"bar"} = "@";
+# $forwards{"bar"} = "\$";
+
+# Check that every subroutine has a matching forward declaration with
+# the same prototype.
+foreach my $sub (keys (%subs))
+  {
+    # XXX: The location of the subroutine is not reported.
+    if (grep { $sub eq $_ } keys (%forwards))
+      {
+	if ($forwards{$sub} ne $subs{$sub})
+	  {
+	    $error_count += 1;
+	    warn ("prototype mismatch for \"$sub\" subroutine\n");
+	  }
+      }
+    else
+      {
+	$error_count += 1;
+	warn ("missing prototype for \"$sub\" subroutine\n");
+      }
+  }
+
+exit (($error_count == 0) ? 0 : 1);