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+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/string16.h"
+
+#if defined(WCHAR_T_IS_UTF16)
+
+#error This file should not be used on 2-byte wchar_t systems
+// If this winds up being needed on 2-byte wchar_t systems, either the
+// definitions below can be used, or the host system's wide character
+// functions like wmemcmp can be wrapped.
+
+#elif defined(WCHAR_T_IS_UTF32)
+
+#include <ostream>
+
+#include "base/utf_string_conversions.h"
+
+namespace base {
+
+int c16memcmp(const char16* s1, const char16* s2, size_t n) {
+ // We cannot call memcmp because that changes the semantics.
+ while (n-- > 0) {
+ if (*s1 != *s2) {
+ // We cannot use (*s1 - *s2) because char16 is unsigned.
+ return ((*s1 < *s2) ? -1 : 1);
+ }
+ ++s1;
+ ++s2;
+ }
+ return 0;
+}
+
+size_t c16len(const char16* s) {
+ const char16 *s_orig = s;
+ while (*s) {
+ ++s;
+ }
+ return s - s_orig;
+}
+
+const char16* c16memchr(const char16* s, char16 c, size_t n) {
+ while (n-- > 0) {
+ if (*s == c) {
+ return s;
+ }
+ ++s;
+ }
+ return 0;
+}
+
+char16* c16memmove(char16* s1, const char16* s2, size_t n) {
+ return reinterpret_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
+}
+
+char16* c16memcpy(char16* s1, const char16* s2, size_t n) {
+ return reinterpret_cast<char16*>(memcpy(s1, s2, n * sizeof(char16)));
+}
+
+char16* c16memset(char16* s, char16 c, size_t n) {
+ char16 *s_orig = s;
+ while (n-- > 0) {
+ *s = c;
+ ++s;
+ }
+ return s_orig;
+}
+
+} // namespace base
+
+template class std::basic_string<char16, base::string16_char_traits>;
+
+namespace base {
+std::ostream& operator<<(std::ostream& out, const string16& str) {
+ return out << UTF16ToUTF8(str);
+}
+}
+
+#endif // WCHAR_T_IS_UTF32