checkpatch: Check for stdlib usage.

Many standard library functions are wrapped in OVS, so check for usage
of the original versions and suggest that authors replace them with the
OVS versions.

Signed-off-by: Joe Stringer <joe@ovn.org>
Acked-by: Aaron Conole <aconole@redhat.com>
Acked-by: Ben Pfaff <blp@ovn.org>

utilities/checkpatch.py

@@ -210,6 +210,38 @@ checks = [
 ]
 
 
+def regex_function_factory(func_name):
+    regex = re.compile('[^x]%s\([^)]*\)' % func_name)
+    return lambda x: regex.search(x) is not None
+
+
+def regex_error_factory(description):
+    return lambda: print_error(description)
+
+
+std_functions = [
+        ('malloc', 'Use xmalloc() in place of malloc()'),
+        ('calloc', 'Use xcalloc() in place of calloc()'),
+        ('realloc', 'Use xrealloc() in place of realloc()'),
+        ('strdup', 'Use xstrdup() in place of strdup()'),
+        ('asprintf', 'Use xasprintf() in place of asprintf()'),
+        ('vasprintf', 'Use xvasprintf() in place of vasprintf()'),
+        ('strcpy', 'Use ovs_strlcpy() in place of strcpy()'),
+        ('strlcpy', 'Use ovs_strlcpy() in place of strlcpy()'),
+        ('strncpy', 'Use ovs_strzcpy() in place of strncpy()'),
+        ('strerror', 'Use ovs_strerror() in place of strerror()'),
+        ('sleep', 'Use xsleep() in place of sleep()'),
+        ('abort', 'Use ovs_abort() in place of abort()'),
+        ('error', 'Use ovs_error() in place of error()'),
+]
+checks += [
+    {'regex': '(.c|.h)(.in)?$',
+     'match_name': None,
+     'check': regex_function_factory(function_name),
+     'print': regex_error_factory(description)}
+    for (function_name, description) in std_functions]
+
+
 def get_file_type_checks(filename):
     """Returns the list of checks for a file based on matching the filename
        against regex."""