Add script for detecting bad characters.

Co-authored-by: Shu Muto <shu.mutow@nec.com>

scripts/check-ctrlcode.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+import re
+
+def main():
+    args = sys.argv
+    if (len(args) != 3):
+        print("Usage: ./check-ctrlcode.py <dir> <ext>")
+        sys.exit(1)
+
+    dirpath = args[1]
+    ext = args[2]
+
+    fullpath = os.path.abspath(dirpath)
+    if (os.path.isdir(fullpath) is not True):
+        print("Directory not found.")
+        sys.exit(1)
+
+    check_dir(fullpath, ext)
+
+def check_dir(path, ext):
+    for f in os.listdir(path):
+        if(f[0] != "."):
+            fullpath = os.path.join(path, f)
+            if(os.path.isfile(fullpath)):
+                exts = os.path.splitext(f)
+                if(exts[1] == ext):
+                    check_ctrlcode(fullpath)
+            else:
+                check_dir(fullpath, ext)
+
+def check_ctrlcode(filepath):
+    line = 0
+    with open(filepath, encoding='utf-8') as f:
+        while True:
+            str = f.readline()
+            if str:
+                line = line + 1
+                # check 0x00-0x1f except 0x09(HT), 0x0a(LF), 0x0d(CR)
+                pattern = re.compile('[\u0000-\u0008\u000b\u000c\u000e-\u001f]')
+                m = pattern.search(str)
+                if(m != None):
+                    pos = m.end()
+                    ctrl = m.group().encode("utf-8")
+                    print("{0} <L{1}:{2}:{3}>: {4}\n".format(filepath, line, pos, ctrl, str.replace('\n','')))
+            else:
+                break
+
+
+main()