text: // Copyright (c) 2012 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 static_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
  }
  
  char16* c16memcpy(char16* s1, const char16* s2, size_t n) {
    return static_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);
  }
  
  void PrintTo(const string16& str, std::ostream* out) {
    *out << str;
  }
  }
  
  #endif  // WCHAR_T_IS_UTF32
  