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comparison: ipc/chromium/src/base/string16.cc
ipc/chromium/src/base/string16.cc
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| 1 // Copyright (c) 2006-2008 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 | |
| 18 namespace base { | |
| 19 | |
| 20 int c16memcmp(const char16* s1, const char16* s2, size_t n) { | |
| 21 // We cannot call memcmp because that changes the semantics. | |
| 22 while (n-- > 0) { | |
| 23 if (*s1 != *s2) { | |
| 24 // We cannot use (*s1 - *s2) because char16 is unsigned. | |
| 25 return ((*s1 < *s2) ? -1 : 1); | |
| 26 } | |
| 27 ++s1; | |
| 28 ++s2; | |
| 29 } | |
| 30 return 0; | |
| 31 } | |
| 32 | |
| 33 size_t c16len(const char16* s) { | |
| 34 const char16 *s_orig = s; | |
| 35 while (*s) { | |
| 36 ++s; | |
| 37 } | |
| 38 return s - s_orig; | |
| 39 } | |
| 40 | |
| 41 const char16* c16memchr(const char16* s, char16 c, size_t n) { | |
| 42 while (n-- > 0) { | |
| 43 if (*s == c) { | |
| 44 return s; | |
| 45 } | |
| 46 ++s; | |
| 47 } | |
| 48 return 0; | |
| 49 } | |
| 50 | |
| 51 char16* c16memmove(char16* s1, const char16* s2, size_t n) { | |
| 52 return reinterpret_cast<char16*>(memmove(s1, s2, n * sizeof(char16))); | |
| 53 } | |
| 54 | |
| 55 char16* c16memcpy(char16* s1, const char16* s2, size_t n) { | |
| 56 return reinterpret_cast<char16*>(memcpy(s1, s2, n * sizeof(char16))); | |
| 57 } | |
| 58 | |
| 59 char16* c16memset(char16* s, char16 c, size_t n) { | |
| 60 char16 *s_orig = s; | |
| 61 while (n-- > 0) { | |
| 62 *s = c; | |
| 63 ++s; | |
| 64 } | |
| 65 return s_orig; | |
| 66 } | |
| 67 | |
| 68 } // namespace base | |
| 69 | |
| 70 template class std::basic_string<char16, base::string16_char_traits>; | |
| 71 | |
| 72 #endif // WCHAR_T_IS_UTF32 |
