Revert Linux sys_string_conversion changes.

base/sys_string_conversions_linux.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/sys_string_conversions.h"
 
-#include <wchar.h>
-
 #include "base/string_piece.h"
 #include "base/string_util.h"
 
 namespace base {
 
 std::string SysWideToUTF8(const std::wstring& wide) {
   // In theory this should be using the system-provided conversion rather
   // than our ICU, but this will do for now.
   return WideToUTF8(wide);
 }
 std::wstring SysUTF8ToWide(const StringPiece& utf8) {
   // In theory this should be using the system-provided conversion rather
   // than our ICU, but this will do for now.
   std::wstring out;
   UTF8ToWide(utf8.data(), utf8.size(), &out);
   return out;
 }
 
 std::string SysWideToNativeMB(const std::wstring& wide) {
-  mbstate_t ps;
-
-  // Calculate the number of multi-byte characters.  We walk through the string
-  // without writing the output, counting the number of multi-byte characters.
-  size_t num_out_chars = 0;
-  memset(&ps, 0, sizeof(ps));
-  for (size_t i = 0; i < wide.size(); ++i) {
-    const wchar_t src = wide[i];
-    // Use a temp buf since a output of NULL does not do what we want.
-    char buf[16];
-    // We don't want wcrtomb to do it's funkiness for embedded NULLs.
-    size_t res = src ? wcrtomb(buf, src, &ps) : 0;
-    switch (res) {
-      // Handle any errors and return an empty string.
-      case -1:
-        return std::string();
-        break;
-      case 0:
-        // We hit an embedded null byte, keep going.
-        ++num_out_chars;
-      default:
-        num_out_chars += res;
-        break;
-    }
-  }
-
-  if (num_out_chars == 0)
-    return std::string();
-
-  std::string out;
-  out.resize(num_out_chars);
-
-  // We walk the input string again, with |i| tracking the index of the
-  // wide input, and |j| tracking the multi-byte output.
-  memset(&ps, 0, sizeof(ps));
-  for (size_t i = 0, j = 0; i < wide.size(); ++i) {
-    const wchar_t src = wide[i];
-    // We don't want wcrtomb to do it's funkiness for embedded NULLs.
-    size_t res = src ? wcrtomb(&out[j], src, &ps) : 0;
-    switch (res) {
-      // Handle any errors and return an empty string.
-      case -1:
-        return std::string();
-        break;
-      case 0:
-        // We hit an embedded null byte, keep going.
-        ++j;  // Output is already 0.
-      default:
-        j += res;
-        break;
-    }
-  }
-
-  return out;
+  // TODO(evanm): we can't assume Linux is UTF-8.
+  return SysWideToUTF8(wide);
 }
 
 std::wstring SysNativeMBToWide(const StringPiece& native_mb) {
-  mbstate_t ps;
-
-  // Calculate the number of wide characters.  We walk through the string
-  // without writing the output, counting the number of wide characters.
-  size_t num_out_chars = 0;
-  memset(&ps, 0, sizeof(ps));
-  for (size_t i = 0; i < native_mb.size(); ) {
-    const char* src = native_mb.data() + i;
-    size_t res = mbrtowc(NULL, src, native_mb.size() - i, &ps);
-    switch (res) {
-      // Handle any errors and return an empty string.
-      case -2:
-      case -1:
-        return std::wstring();
-        break;
-      case 0:
-        // We hit an embedded null byte, keep going.
-        i += 1;  // Fall through.
-      default:
-        i += res;
-        ++num_out_chars;
-        break;
-    }
-  }
-
-  if (num_out_chars == 0)
-    return std::wstring();
-
-  std::wstring out;
-  out.resize(num_out_chars);
-
-  memset(&ps, 0, sizeof(ps));  // Clear the shift state.
-  // We walk the input string again, with |i| tracking the index of the
-  // multi-byte input, and |j| tracking the wide output.
-  for (size_t i = 0, j = 0; i < native_mb.size(); ++j) {
-    const char* src = native_mb.data() + i;
-    wchar_t* dst = &out[j];
-    size_t res = mbrtowc(dst, src, native_mb.size() - i, &ps);
-    switch (res) {
-      // Handle any errors and return an empty string.
-      case -2:
-      case -1:
-        return std::wstring();
-        break;
-      case 0:
-        i += 1;  // Skip null, fall through.
-      default:
-        i += res;
-        break;
-    }
-  }
-
-  return out;
+  // TODO(evanm): we can't assume Linux is UTF-8.
+  return SysUTF8ToWide(native_mb);
 }
 
 }  // namespace base