1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/strings/string16.h"
6
7#if defined(WCHAR_T_IS_UTF16)
8
9#error This file should not be used on 2-byte wchar_t systems
10// If this winds up being needed on 2-byte wchar_t systems, either the
11// definitions below can be used, or the host system's wide character
12// functions like wmemcmp can be wrapped.
13
14#elif defined(WCHAR_T_IS_UTF32)
15
16#include <ostream>
17
18#include "base/strings/utf_string_conversions.h"
19
20namespace base {
21
22int c16memcmp(const char16* s1, const char16* s2, size_t n) {
23  // We cannot call memcmp because that changes the semantics.
24  while (n-- > 0) {
25    if (*s1 != *s2) {
26      // We cannot use (*s1 - *s2) because char16 is unsigned.
27      return ((*s1 < *s2) ? -1 : 1);
28    }
29    ++s1;
30    ++s2;
31  }
32  return 0;
33}
34
35size_t c16len(const char16* s) {
36  const char16 *s_orig = s;
37  while (*s) {
38    ++s;
39  }
40  return s - s_orig;
41}
42
43const char16* c16memchr(const char16* s, char16 c, size_t n) {
44  while (n-- > 0) {
45    if (*s == c) {
46      return s;
47    }
48    ++s;
49  }
50  return 0;
51}
52
53char16* c16memmove(char16* s1, const char16* s2, size_t n) {
54  return static_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
55}
56
57char16* c16memcpy(char16* s1, const char16* s2, size_t n) {
58  return static_cast<char16*>(memcpy(s1, s2, n * sizeof(char16)));
59}
60
61char16* c16memset(char16* s, char16 c, size_t n) {
62  char16 *s_orig = s;
63  while (n-- > 0) {
64    *s = c;
65    ++s;
66  }
67  return s_orig;
68}
69
70std::ostream& operator<<(std::ostream& out, const string16& str) {
71  return out << UTF16ToUTF8(str);
72}
73
74void PrintTo(const string16& str, std::ostream* out) {
75  *out << str;
76}
77
78}  // namespace base
79
80template class std::basic_string<base::char16, base::string16_char_traits>;
81
82#endif  // WCHAR_T_IS_UTF32
83