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) 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 83
