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1 // Copyright (c) 2012 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 <ostream> | |
17 | |
18 #include "base/strings/utf_string_conversions.h" | |
19 | |
20 namespace base { | |
21 | |
22 int 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 | |
35 size_t c16len(const char16* s) { | |
36 const char16 *s_orig = s; | |
37 while (*s) { | |
38 ++s; | |
39 } | |
40 return s - s_orig; | |
41 } | |
42 | |
43 const 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 | |
53 char16* c16memmove(char16* s1, const char16* s2, size_t n) { | |
54 return static_cast<char16*>(memmove(s1, s2, n * sizeof(char16))); | |
55 } | |
56 | |
57 char16* c16memcpy(char16* s1, const char16* s2, size_t n) { | |
58 return static_cast<char16*>(memcpy(s1, s2, n * sizeof(char16))); | |
59 } | |
60 | |
61 char16* 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 | |
70 std::ostream& operator<<(std::ostream& out, const string16& str) { | |
71 return out << UTF16ToUTF8(str); | |
72 } | |
73 | |
74 void PrintTo(const string16& str, std::ostream* out) { | |
75 *out << str; | |
76 } | |
77 | |
78 } // namespace base | |
79 | |
80 template class std::basic_string<char16, base::string16_char_traits>; | |
81 | |
82 #endif // WCHAR_T_IS_UTF32 | |
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