1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
2 //
3 // Redistribution and use in source and binary forms, with or without
4 // modification, are permitted provided that the following conditions are
5 // met:
6 //
7 // * Redistributions of source code must retain the above copyright
8 // notice, this list of conditions and the following disclaimer.
9 // * Redistributions in binary form must reproduce the above
10 // copyright notice, this list of conditions and the following disclaimer
11 // in the documentation and/or other materials provided with the
12 // distribution.
13 // * Neither the name of Google Inc. nor the names of its
14 // contributors may be used to endorse or promote products derived from
15 // this software without specific prior written permission.
16 //
17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29 #include "base/string16.h"
30
31 #ifdef WIN32
32
33 #error This file should not be used on 2-byte wchar_t systems
34 // If this winds up being needed on 2-byte wchar_t systems, either the
35 // definitions below can be used, or the host system's wide character
36 // functions like wmemcmp can be wrapped.
37
38 #else // !WIN32
39
40 namespace base {
41
c16memcmp(const char16 * s1,const char16 * s2,size_t n)42 int c16memcmp(const char16* s1, const char16* s2, size_t n) {
43 // We cannot call memcmp because that changes the semantics.
44 while (n-- > 0) {
45 if (*s1 != *s2) {
46 // We cannot use (*s1 - *s2) because char16 is unsigned.
47 return ((*s1 < *s2) ? -1 : 1);
48 }
49 ++s1;
50 ++s2;
51 }
52 return 0;
53 }
54
c16len(const char16 * s)55 size_t c16len(const char16* s) {
56 const char16 *s_orig = s;
57 while (*s) {
58 ++s;
59 }
60 return s - s_orig;
61 }
62
c16memchr(const char16 * s,char16 c,size_t n)63 const char16* c16memchr(const char16* s, char16 c, size_t n) {
64 while (n-- > 0) {
65 if (*s == c) {
66 return s;
67 }
68 ++s;
69 }
70 return 0;
71 }
72
c16memmove(char16 * s1,const char16 * s2,size_t n)73 char16* c16memmove(char16* s1, const char16* s2, size_t n) {
74 return reinterpret_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
75 }
76
c16memcpy(char16 * s1,const char16 * s2,size_t n)77 char16* c16memcpy(char16* s1, const char16* s2, size_t n) {
78 return reinterpret_cast<char16*>(memcpy(s1, s2, n * sizeof(char16)));
79 }
80
c16memset(char16 * s,char16 c,size_t n)81 char16* c16memset(char16* s, char16 c, size_t n) {
82 char16 *s_orig = s;
83 while (n-- > 0) {
84 *s = c;
85 ++s;
86 }
87 return s_orig;
88 }
89
90 } // namespace base
91
92 template class std::basic_string<char16, base::string16_char_traits>;
93
94 #endif // WIN32
95