string16.cc revision c7f5f8508d98d5952d42ed7648c2a8f30a4da156 
1// Copyright (c) 2009 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/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 "base/string_util.h"
17#include "base/utf_string_conversions.h"
18
19namespace base {
20
21int c16memcmp(const char16* s1, const char16* s2, size_t n) {
22  // We cannot call memcmp because that changes the semantics.
23  while (n-- > 0) {
24    if (*s1 != *s2) {
25      // We cannot use (*s1 - *s2) because char16 is unsigned.
26      return ((*s1 < *s2) ? -1 : 1);
27    }
28    ++s1;
29    ++s2;
30  }
31  return 0;
32}
33
34size_t c16len(const char16* s) {
35  const char16 *s_orig = s;
36  while (*s) {
37    ++s;
38  }
39  return s - s_orig;
40}
41
42const char16* c16memchr(const char16* s, char16 c, size_t n) {
43  while (n-- > 0) {
44    if (*s == c) {
45      return s;
46    }
47    ++s;
48  }
49  return 0;
50}
51
52char16* c16memmove(char16* s1, const char16* s2, size_t n) {
53  return reinterpret_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
54}
55
56char16* c16memcpy(char16* s1, const char16* s2, size_t n) {
57  return reinterpret_cast<char16*>(memcpy(s1, s2, n * sizeof(char16)));
58}
59
60char16* c16memset(char16* s, char16 c, size_t n) {
61  char16 *s_orig = s;
62  while (n-- > 0) {
63    *s = c;
64    ++s;
65  }
66  return s_orig;
67}
68
69}  // namespace base
70
71template class std::basic_string<char16, base::string16_char_traits>;
72
73std::ostream& operator<<(std::ostream& out, const string16& str) {
74  return out << UTF16ToUTF8(str);
75}
76
77#endif  // WCHAR_T_IS_UTF32
78