From fe012b454a193c1f81ab8011ecd620750e5869f0 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Wed, 9 Mar 2011 21:42:08 +0000
Subject: [PATCH] Add a script and Makefile target to check for violations of
 the recently added standards for copyright and license comments.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@24694 dc483132-0cff-0310-8789-dd5450dbe970
---
 src/Makefile.in                  |   5 ++
 src/util/krb5-check-copyright.py | 105 +++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+)
 create mode 100644 src/util/krb5-check-copyright.py

diff --git a/src/Makefile.in b/src/Makefile.in
index d76797b87..769f964a1 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -749,6 +749,11 @@ mark-cstyle-bsd::
 	(cd $(top_srcdir) && $(FIND) $(BSDFILES) -print0 | $(XARGS) -0 \
 	$(PYTHON) util/krb5-mark-cstyle.py --cstyle=bsd)
 
+check-copyright:
+	(cd $(top_srcdir) && \
+	$(FIND) . \( -name '*.[ch]' -o -name '*.hin' \) -print0 | \
+	$(XARGS) -0 python util/krb5-check-copyright.py)
+
 doxygen::
 	if test "which doxygen" != ""; then \
 		doxygen; \
diff --git a/src/util/krb5-check-copyright.py b/src/util/krb5-check-copyright.py
new file mode 100644
index 000000000..54e3597be
--- /dev/null
+++ b/src/util/krb5-check-copyright.py
@@ -0,0 +1,105 @@
+# Copyright (C) 2011 by the Massachusetts Institute of Technology.
+# All rights reserved.
+#
+# Export of this software from the United States of America may
+#   require a specific license from the United States Government.
+#   It is the responsibility of any person or organization contemplating
+#   export to obtain such a license before exporting.
+#
+# WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+# distribute this software and its documentation for any purpose and
+# without fee is hereby granted, provided that the above copyright
+# notice appear in all copies and that both that copyright notice and
+# this permission notice appear in supporting documentation, and that
+# the name of M.I.T. not be used in advertising or publicity pertaining
+# to distribution of the software without specific, written prior
+# permission.  Furthermore if you modify this software you must label
+# your software as modified software and not distribute it in such a
+# fashion that it might be confused with the original M.I.T. software.
+# M.I.T. makes no representations about the suitability of
+# this software for any purpose.  It is provided "as is" without express
+# or implied warranty.
+
+# This program is intended to be used by "make check-copyright".  It
+# checks for violations of the coding standards related to copyright
+# and license statements in source code comments.
+
+import os
+import sys
+import re
+
+def warn(fname, ln, msg):
+    print '%s: %d: %s' % (fname, ln + 1, msg)
+
+def indicates_license(line):
+    return 'Copyright' in line or 'COPYRIGHT' in line or 'License' in line
+
+# Check a comment for boilerplate violations.  Return true if the comment
+# is a license statement.
+def check_comment(comment, fname, ln, code_seen, nonlicense_seen):
+    text_seen = False
+    is_license = False
+    for line in comment:
+        if not is_license and indicates_license(line):
+            is_license = True
+            if text_seen:
+                warn(fname, ln, 'License begins after first line of comment')
+            elif code_seen:
+                warn(fname, ln, 'License after code')
+            elif nonlicense_seen:
+                warn(fname, ln, 'License after non-license comments')
+            break
+        # DB2 licenses start with '/*-' and we don't want to change them.
+        if line != '' and line != '-':
+            text_seen = True
+    return is_license
+
+def check_file(lines, fname):
+    # Skip emacs mode line if present.
+    ln = 0
+    if '-*- mode: c;' in lines[ln]:
+        ln += 1
+
+    # Check filename comment if present.
+    m = re.match(r'/\* ([^ ]*)( - .*)? \*/', lines[ln])
+    if m:
+        if m.group(1) != fname:
+            warn(fname, ln, 'Wrong filename in comment')
+        ln += 1
+
+    # Scan for license statements.
+    in_comment = False
+    code_seen = False
+    nonlicense_seen = False
+    for line in lines[ln:]:
+        # Strip out whitespace and comments contained within a line.
+        if not in_comment:
+            line = re.sub(r'/\*.*?\*/', '', line)
+        line = line.strip()
+
+        if not in_comment and '/*' in line:
+            (line, sep, comment_part) = line.partition('/*')
+            comment = [comment_part.strip()]
+            comment_starts_at = ln
+            in_comment = True
+        elif in_comment and '*/' not in line:
+            comment.append(line.lstrip('*').lstrip())
+        elif in_comment:
+            (comment_part, sep, line) = line.partition('*/')
+            comment.append(comment_part.strip())
+            is_license = check_comment(comment, fname, comment_starts_at,
+                                       code_seen, nonlicense_seen)
+            nonlicense_seen = nonlicense_seen or not is_license
+            in_comment = False
+        elif line.strip() != '':
+            code_seen = True
+
+        ln += 1
+
+for fname in sys.argv[1:]:
+    if fname.startswith('./'):
+        fname = fname[2:]
+    f = open(fname)
+    lines = f.readlines()
+    f.close()
+    check_file(lines, fname)
-- 
2.26.2