1 : // Copyright (c) 2006-2008 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 :
18 : namespace base {
19 :
20 0 : int c16memcmp(const char16* s1, const char16* s2, size_t n) {
21 : // We cannot call memcmp because that changes the semantics.
22 0 : while (n-- > 0) {
23 0 : if (*s1 != *s2) {
24 : // We cannot use (*s1 - *s2) because char16 is unsigned.
25 0 : return ((*s1 < *s2) ? -1 : 1);
26 : }
27 0 : ++s1;
28 0 : ++s2;
29 : }
30 0 : return 0;
31 : }
32 :
33 0 : size_t c16len(const char16* s) {
34 0 : const char16 *s_orig = s;
35 0 : while (*s) {
36 0 : ++s;
37 : }
38 0 : return s - s_orig;
39 : }
40 :
41 0 : const char16* c16memchr(const char16* s, char16 c, size_t n) {
42 0 : while (n-- > 0) {
43 0 : if (*s == c) {
44 0 : return s;
45 : }
46 0 : ++s;
47 : }
48 0 : return 0;
49 : }
50 :
51 0 : char16* c16memmove(char16* s1, const char16* s2, size_t n) {
52 0 : return reinterpret_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
53 : }
54 :
55 0 : char16* c16memcpy(char16* s1, const char16* s2, size_t n) {
56 0 : return reinterpret_cast<char16*>(memcpy(s1, s2, n * sizeof(char16)));
57 : }
58 :
59 0 : char16* c16memset(char16* s, char16 c, size_t n) {
60 0 : char16 *s_orig = s;
61 0 : while (n-- > 0) {
62 0 : *s = c;
63 0 : ++s;
64 : }
65 0 : return s_orig;
66 : }
67 :
68 : } // namespace base
69 :
70 : template class std::basic_string<char16, base::string16_char_traits>;
71 :
72 : #endif // WCHAR_T_IS_UTF32
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