support multiple log message handlers in base/logging.h

components/crash/content/app/crashpad.cc

 // Copyright 2015 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 "components/crash/content/app/crashpad.h"
 
 #include <stddef.h>
 #include <string.h>
 
 #include <algorithm>
@@ skipping 35 matching lines @@
 void SetCrashKeyValue(const base::StringPiece& key,
                       const base::StringPiece& value) {
   g_simple_string_dictionary->SetKeyValue(key.data(), value.data());
 }
 
 void ClearCrashKey(const base::StringPiece& key) {
   g_simple_string_dictionary->RemoveKey(key.data());
 }
 
 bool LogMessageHandler(int severity,
-                       const char* file,
+                       const std::string& file,
                        int line,
-                       size_t message_start,
                        const std::string& string) {
   // Only handle FATAL.
   if (severity != logging::LOG_FATAL) {
     return false;
   }
 
   // In case of an out-of-memory condition, this code could be reentered when
   // constructing and storing the key. Using a static is not thread-safe, but if
   // multiple threads are in the process of a fatal crash at the same time, this
   // should work.
   static bool guarded = false;
   if (guarded) {
     return false;
   }
   base::AutoReset<bool> guard(&guarded, true);
 
   // Only log last path component.  This matches logging.cc.
-  if (file) {
-    const char* slash = strrchr(file, '/');
-    if (slash) {
-      file = slash + 1;
-    }
-  }
+  size_t last_slash = file.rfind('/');
+  if (last_slash == file.npos)
+    last_slash = 0;
+  else
+    last_slash++;
 
-  CHECK_LE(message_start, string.size());
-  std::string message = base::StringPrintf("%s:%d: %s", file, line,
-                                           string.c_str() + message_start);
+  std::string message = base::StringPrintf("%s:%d: %s",
+                                           file.substr(last_slash).c_str(),
+                                           line, string.c_str());
   SetCrashKeyValue("LOG_FATAL", message);
 
   // Rather than including the code to force the crash here, allow the caller to
   // do it.
   return false;
 }
 
 void DumpWithoutCrashing() {
   CRASHPAD_SIMULATE_CRASH();
 }
@@ skipping 61 matching lines @@
   crash_reporter_client->RegisterCrashKeys();
 
   SetCrashKeyValue("ptype", browser_process ? base::StringPiece("browser")
                                             : base::StringPiece(process_type));
 #if defined(OS_POSIX)
   SetCrashKeyValue("pid", base::IntToString(getpid()));
 #elif defined(OS_WIN)
   SetCrashKeyValue("pid", base::IntToString(::GetCurrentProcessId()));
 #endif
 
-  logging::SetLogMessageHandler(LogMessageHandler);
+  logging::AddLogMessageHandler(LogMessageHandler);
 
   // If clients called CRASHPAD_SIMULATE_CRASH() instead of
   // base::debug::DumpWithoutCrashing(), these dumps would appear as crashes in
   // the correct function, at the correct file and line. This would be
   // preferable to having all occurrences show up in DumpWithoutCrashing() at
   // the same file and line.
   base::debug::SetDumpWithoutCrashingFunction(DumpWithoutCrashing);
 
 #if defined(OS_MACOSX)
   // On Mac, we only want the browser to initialize the database, but not the
@@ skipping 153 matching lines @@
 
 // This helper is invoked by code in chrome.dll to request a single crash report
 // upload. See CrashUploadListCrashpad.
 void __declspec(dllexport)
     RequestSingleCrashUploadImpl(const std::string& local_id) {
   crash_reporter::RequestSingleCrashUpload(local_id);
 }
 }  // extern "C"
 
 #endif  // OS_WIN