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diff --git a/src/ceph/src/common/strtol.h b/src/ceph/src/common/strtol.h
new file mode 100644
index 0000000..810273e
--- /dev/null
+++ b/src/ceph/src/common/strtol.h
@@ -0,0 +1,58 @@
+// -*- 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) 2011 New Dream Network
+ *
+ * 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_COMMON_STRTOL_H
+#define CEPH_COMMON_STRTOL_H
+
+#include <string>
+extern "C" {
+#include <stdint.h>
+}
+
+long long strict_strtoll(const char *str, int base, std::string *err);
+
+int strict_strtol(const char *str, int base, std::string *err);
+
+double strict_strtod(const char *str, std::string *err);
+
+float strict_strtof(const char *str, std::string *err);
+
+uint64_t strict_sistrtoll(const char *str, std::string *err);
+
+template<typename T>
+T strict_si_cast(const char *str, std::string *err);
+
+/* On enter buf points to the end of the buffer, e.g. where the least
+ * significant digit of the input number will be printed. Returns pointer to
+ * where the most significant digit were printed, including zero padding.
+ * Does NOT add zero at the end of buffer, this is responsibility of the caller.
+ */
+template<typename T, const unsigned base = 10, const unsigned width = 1>
+static inline
+char* ritoa(T u, char *buf)
+{
+  static_assert(std::is_unsigned<T>::value, "signed types are not supported");
+  static_assert(base <= 16, "extend character map below to support higher bases");
+  unsigned digits = 0;
+  while (u) {
+    *--buf = "0123456789abcdef"[u % base];
+    u /= base;
+    digits++;
+  }
+  while (digits++ < width)
+    *--buf = '0';
+  return buf;
+}
+
+#endif