Add value string termination check from libosmocore

The script by Neels Hofmeyr <nhofmeyr@sysmocom.de> has actually nothing
to do with libosmocore itself - it's a generic build-time check used by
jenkins so it should be part of this repo to avoid extra checkout of
libosmocore just for this script.

Change-Id: I079218b61f512975ec5bfc7dc23503ec369cbb5a

scripts/verify_value_string_arrays_are_terminated.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+# vim: expandtab tabstop=2 shiftwidth=2 nocin
+
+'''
+Usage:
+  verify_value_string_arrays_are_terminated.py PATH [PATH [...]]
+
+e.g.
+libosmocore/contrib/verify_value_string_arrays_are_terminated.py $(find . -name "*.[hc]")
+'''
+
+import re
+import sys
+import codecs
+
+value_string_array_re = re.compile(
+  r'((\bstruct\s+value_string\b[^{;]*?)\s*=[^{;]*{[^;]*}\s*;)',
+  re.MULTILINE | re.DOTALL)
+
+members = r'(\.(value|str)\s*=\s*)?'
+terminator_re = re.compile('{\s*' + members + '(0|NULL)\s*,'
+                           '\s*' + members + '(0|NULL)\s*}')
+errors_found = 0
+
+for f in sys.argv[1:]:
+  arrays = value_string_array_re.findall(codecs.open(f, "r", "utf-8").read())
+  for array_def, name in arrays:
+    if not terminator_re.search(array_def):
+      print('ERROR: file contains unterminated value_string %r: %r'
+            % (name, f))
+      errors_found += 1
+
+sys.exit(errors_found)