common: add strescape helper

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>

diff --git a/src/common/strescape.h b/src/common/strescape.h
new file mode 100644 (file)
index 0000000..6c9926c
--- /dev/null
+++ b/src/common/strescape.h
@@ -0,0 +1,36 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2021 Red Hat, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_STRESCAPE_H
+#define CEPH_STRESCAPE_H
+
+#include <ostream>
+#include <string_view>
+
+#include <ctype.h>
+
+inline std::string binstrprint(std::string_view sv, size_t maxlen=0)
+{
+  std::string s;
+  if (maxlen == 0 || sv.size() < maxlen) {
+    s = std::string(sv);
+  } else {
+    maxlen = std::max<size_t>(8, maxlen);
+    s = std::string(sv.substr(0, maxlen-3))+"..."s;
+  }
+  std::replace_if(s.begin(), s.end(), [](char c){ return !(isalnum(c) || ispunct(c)); }, '.');
+  return s;
+}
+
+#endif