// Copyright 2013 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/strings/string16.h"

#if defined(WCHAR_T_IS_UTF16) && !defined(_AIX)

#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/strings/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 string16_internals {

std::ostream& operator<<(std::ostream& out, const string16& str) {

  return out << UTF16ToUTF8(str);

}

void PrintTo(const string16& str, std::ostream* out) {

  *out << str;

}

}  // namespace string16_internals

}  // namespace base

template class std::

    basic_string<base::char16, base::string16_internals::string16_char_traits>;

#endif  // WCHAR_T_IS_UTF32