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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) && !defined(_AIX)
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 
c16memcmp(const char16 * s1,const char16 * s2,size_t n)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 
c16len(const char16 * s)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 
c16memchr(const char16 * s,char16 c,size_t n)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 nullptr;
51 }
52 
c16memmove(char16 * s1,const char16 * s2,size_t n)53 char16* c16memmove(char16* s1, const char16* s2, size_t n) {
54   return static_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
55 }
56 
c16memcpy(char16 * s1,const char16 * s2,size_t n)57 char16* c16memcpy(char16* s1, const char16* s2, size_t n) {
58   return static_cast<char16*>(memcpy(s1, s2, n * sizeof(char16)));
59 }
60 
c16memset(char16 * s,char16 c,size_t n)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 namespace string16_internals {
71 
operator <<(std::ostream & out,const string16 & str)72 std::ostream& operator<<(std::ostream& out, const string16& str) {
73   return out << UTF16ToUTF8(str);
74 }
75 
PrintTo(const string16 & str,std::ostream * out)76 void PrintTo(const string16& str, std::ostream* out) {
77   *out << str;
78 }
79 
80 }  // namespace string16_internals
81 
82 }  // namespace base
83 
84 template class std::
85     basic_string<base::char16, base::string16_internals::string16_char_traits>;
86 
87 #endif  // WCHAR_T_IS_UTF32
88