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      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