1 // Copyright (c) 2009 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 #include "base/utf_string_conversions.h" 18 19 namespace base { 20 21 int c16memcmp(const char16* s1, const char16* s2, size_t n) { 22 // We cannot call memcmp because that changes the semantics. 23 while (n-- > 0) { 24 if (*s1 != *s2) { 25 // We cannot use (*s1 - *s2) because char16 is unsigned. 26 return ((*s1 < *s2) ? -1 : 1); 27 } 28 ++s1; 29 ++s2; 30 } 31 return 0; 32 } 33 34 size_t c16len(const char16* s) { 35 const char16 *s_orig = s; 36 while (*s) { 37 ++s; 38 } 39 return s - s_orig; 40 } 41 42 const char16* c16memchr(const char16* s, char16 c, size_t n) { 43 while (n-- > 0) { 44 if (*s == c) { 45 return s; 46 } 47 ++s; 48 } 49 return 0; 50 } 51 52 char16* c16memmove(char16* s1, const char16* s2, size_t n) { 53 return reinterpret_cast<char16*>(memmove(s1, s2, n * sizeof(char16))); 54 } 55 56 char16* c16memcpy(char16* s1, const char16* s2, size_t n) { 57 return reinterpret_cast<char16*>(memcpy(s1, s2, n * sizeof(char16))); 58 } 59 60 char16* c16memset(char16* s, char16 c, size_t n) { 61 char16 *s_orig = s; 62 while (n-- > 0) { 63 *s = c; 64 ++s; 65 } 66 return s_orig; 67 } 68 69 } // namespace base 70 71 template class std::basic_string<char16, base::string16_char_traits>; 72 73 std::ostream& operator<<(std::ostream& out, const string16& str) { 74 return out << UTF16ToUTF8(str); 75 } 76 77 #endif // WCHAR_T_IS_UTF32 78
