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diff --git a/contrib/libs/libmysql_r/strings/my_strchr.cc b/contrib/libs/libmysql_r/strings/my_strchr.cc
new file mode 100644
index 0000000000..cbc3d1f15c
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+++ b/contrib/libs/libmysql_r/strings/my_strchr.cc
@@ -0,0 +1,82 @@
+/* Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License, version 2.0,
+   as published by the Free Software Foundation.
+
+   This program is also distributed with certain software (including
+   but not limited to OpenSSL) that is licensed under separate terms,
+   as designated in a particular file or component or in included license
+   documentation.  The authors of MySQL hereby grant you an additional
+   permission to link the program and your derivative works with the
+   separately licensed software that they have included with MySQL.
+
+   Without limiting anything contained in the foregoing, this file,
+   which is part of C Driver for MySQL (Connector/C), is also subject to the
+   Universal FOSS Exception, version 1.0, a copy of which can be found at
+   http://oss.oracle.com/licenses/universal-foss-exception.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License, version 2.0, for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+#include <stddef.h>
+#include <sys/types.h>
+
+#include "m_ctype.h"
+
+/**
+  Calculate the length of the initial segment of 'str' which consists
+  entirely of characters not in 'reject'.
+
+  @param  cs              Pointer to charset info.
+  @param  str             Pointer to multi-byte string.
+  @param  str_end         Pointer to end of multi-byte string.
+  @param  reject          Pointer to start of single-byte reject string.
+  @param  reject_length   Length of single-byte reject string.
+
+  @return Length of segment of multi-byte string that doesn't contain
+          any character of the single-byte reject string or zero if an
+          invalid encoding of a character of the multi-byte string is
+          found.
+
+  @note The reject string points to single-byte characters so it is
+  only possible to find the first occurrence of a single-byte
+  character.  Multi-byte characters in 'str' are treated as not
+  matching any character in the reject string.
+  This method returns zero if an invalid encoding of any character
+  in the string 'str' using charset 'cs' is found.
+
+  @todo should be moved to CHARSET_INFO if it's going to be called
+  frequently.
+
+  @internal The implementation builds on the assumption that 'str' is long,
+  while 'reject' is short. So it compares each character in string
+  with the characters in 'reject' in a tight loop over the characters
+  in 'reject'.
+*/
+
+size_t my_strcspn(const CHARSET_INFO *cs, const char *str, const char *str_end,
+                  const char *reject, size_t reject_length) {
+  const char *ptr_str, *ptr_reject;
+  const char *reject_end = reject + reject_length;
+  uint mbl = 0;
+
+  for (ptr_str = str; ptr_str < str_end; ptr_str += mbl) {
+    mbl = my_mbcharlen_ptr(cs, ptr_str, str_end);
+
+    if (mbl == 0) return 0;
+
+    if (mbl == 1) {
+      for (ptr_reject = reject; ptr_reject < reject_end; ++ptr_reject) {
+        if (*ptr_reject == *ptr_str) return (size_t)(ptr_str - str);
+      }
+    }
+  }
+  return (size_t)(ptr_str - str);
+}