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diff --git a/base/string_util_mac.h b/base/string_util_mac.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef BASE_STRING_UTIL_MAC_H__
+#define BASE_STRING_UTIL_MAC_H__
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <wchar.h>
+
+inline bool StrCpy(char* dst, const char* src, size_t dst_size) {
+  return strlcpy(dst, src, dst_size) < dst_size;
+}
+
+inline int StrNCaseCmp(const char* string1, const char* string2, size_t count) {
+  return strncasecmp(string1, string2, count);
+}
+
+inline int VSNPrintF(char* buffer, size_t size,
+                     const char* format, va_list arguments) {
+  return vsnprintf(buffer, size, format, arguments);
+}
+
+inline bool WcsCpy(char* dst, const char* src, size_t dst_size) {
+  return strlcpy(dst, src, dst_size) < dst_size;
+}
+
+inline int VSWPrintF(wchar_t* buffer, size_t size,
+                     const wchar_t* format, va_list arguments) {
+  return vswprintf(buffer, size, format, arguments);
+}
+
+// StrNCpy and WcsNCpy are not inline, so they're implemented in the .cc file.
+
+#endif  // BASE_STRING_UTIL_MAC_H__