update header guards to be C++ style. Fixes issue #9

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

scripts/update_header_guards.py

@@ -0,0 +1,60 @@
+# Copyright (c) 2015 Microsoft Corporation
+
+import os
+import re
+
+ifndef = re.compile("#ifndef \_(.*)\_H\_")
+defn   = re.compile("#define \_(.*)\_H\_")
+endif  = re.compile("#endif /\* \_(.*)\_H\_")
+
+
+def fix_hdr(file):
+    print file
+    tmp = "%s.tmp" % file
+    ins = open(file)
+    ous = open(tmp,'w')
+    line = ins.readline()
+    found = False
+    while line:
+	m = ifndef.search(line)
+	if m:
+	    print m.group(1)
+	    ous.write("#ifndef ")
+	    ous.write(m.group(1))
+	    ous.write("_H_\n")
+	    line = ins.readline()
+	    found = True
+	    continue
+	m = defn.search(line)
+	if m:
+	    ous.write("#define ")
+	    ous.write(m.group(1))
+	    ous.write("_H_\n")
+	    line = ins.readline()
+	    found = True
+	    continue
+	m = endif.search(line)
+	if m:
+	    ous.write("#endif /* ")
+	    ous.write(m.group(1))
+	    ous.write("_H_ */\n")
+	    line = ins.readline()
+	    found = True
+	    continue
+	ous.write(line)
+	line = ins.readline()
+    ins.close()
+    ous.close()
+    if found:
+	os.system("move %s %s" % (tmp, file))
+    else:
+	os.system("del %s" % tmp)
+    
+def fixup(dir):
+    for root, dirs, files in os.walk(dir):
+	for f in files:
+	    if f.endswith('.h'):
+		path = "%s\\%s" % (root, f)
+		fix_hdr(path)
+
+fixup('src')