michael@0: // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "base/string16.h"
michael@0: 
michael@0: #if defined(WCHAR_T_IS_UTF16)
michael@0: 
michael@0: #error This file should not be used on 2-byte wchar_t systems
michael@0: // If this winds up being needed on 2-byte wchar_t systems, either the
michael@0: // definitions below can be used, or the host system's wide character
michael@0: // functions like wmemcmp can be wrapped.
michael@0: 
michael@0: #elif defined(WCHAR_T_IS_UTF32)
michael@0: 
michael@0: #include "base/string_util.h"
michael@0: 
michael@0: namespace base {
michael@0: 
michael@0: int c16memcmp(const char16* s1, const char16* s2, size_t n) {
michael@0:   // We cannot call memcmp because that changes the semantics.
michael@0:   while (n-- > 0) {
michael@0:     if (*s1 != *s2) {
michael@0:       // We cannot use (*s1 - *s2) because char16 is unsigned.
michael@0:       return ((*s1 < *s2) ? -1 : 1);
michael@0:     }
michael@0:     ++s1;
michael@0:     ++s2;
michael@0:   }
michael@0:   return 0;
michael@0: }
michael@0: 
michael@0: size_t c16len(const char16* s) {
michael@0:   const char16 *s_orig = s;
michael@0:   while (*s) {
michael@0:     ++s;
michael@0:   }
michael@0:   return s - s_orig;
michael@0: }
michael@0: 
michael@0: const char16* c16memchr(const char16* s, char16 c, size_t n) {
michael@0:   while (n-- > 0) {
michael@0:     if (*s == c) {
michael@0:       return s;
michael@0:     }
michael@0:     ++s;
michael@0:   }
michael@0:   return 0;
michael@0: }
michael@0: 
michael@0: char16* c16memmove(char16* s1, const char16* s2, size_t n) {
michael@0:   return reinterpret_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
michael@0: }
michael@0: 
michael@0: char16* c16memcpy(char16* s1, const char16* s2, size_t n) {
michael@0:   return reinterpret_cast<char16*>(memcpy(s1, s2, n * sizeof(char16)));
michael@0: }
michael@0: 
michael@0: char16* c16memset(char16* s, char16 c, size_t n) {
michael@0:   char16 *s_orig = s;
michael@0:   while (n-- > 0) {
michael@0:     *s = c;
michael@0:     ++s;
michael@0:   }
michael@0:   return s_orig;
michael@0: }
michael@0: 
michael@0: }  // namespace base
michael@0: 
michael@0: template class std::basic_string<char16, base::string16_char_traits>;
michael@0: 
michael@0: #endif  // WCHAR_T_IS_UTF32