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 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 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 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 73 char16* c16memmove(char16* s1, const char16* s2, size_t n) { 74 return reinterpret_cast<char16*>(memmove(s1, s2, n * sizeof(char16))); 75 } 76 77 char16* c16memcpy(char16* s1, const char16* s2, size_t n) { 78 return reinterpret_cast<char16*>(memcpy(s1, s2, n * sizeof(char16))); 79 } 80 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
