SERVER-29533 make mongodbmain a library

In service of making it easier to stand up mongodb in a library let's
separate out mongodbmain into its own library and structure db.cpp to
link to it, rather than including all of the setup in the final .cpp.

1 files changed, 52 insertions, 0 deletions

diff --git a/src/mongo/db/dbmain.cpp b/src/mongo/db/dbmain.cpp
new file mode 100644
index 00000000000..a16b7fee6b8
--- /dev/null
+++ b/src/mongo/db/dbmain.cpp
@@ -0,0 +1,52 @@
+/**
+ *    Copyright (C) 2017 MongoDB Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Affero General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Affero General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the GNU Affero General Public License in all respects
+ *    for all of the code used other than as permitted herein. If you modify
+ *    file(s) with this exception, you may extend this exception to your
+ *    version of the file(s), but you are not obligated to do so. If you do not
+ *    wish to do so, delete this exception statement from your version. If you
+ *    delete this exception statement from all source files in the program,
+ *    then also delete it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/db/dbmain.h"
+
+#include "mongo/util/quick_exit.h"
+#include "mongo/util/text.h"
+
+#if defined(_WIN32)
+// In Windows, wmain() is an alternate entry point for main(), and receives the same parameters
+// as main() but encoded in Windows Unicode (UTF-16); "wide" 16-bit wchar_t characters.  The
+// WindowsCommandLine object converts these wide character strings to a UTF-8 coded equivalent
+// and makes them available through the argv() and envp() members.  This enables mongoDbMain()
+// to process UTF-8 encoded arguments and environment variables without regard to platform.
+int wmain(int argc, wchar_t* argvW[], wchar_t* envpW[]) {
+    mongo::WindowsCommandLine wcl(argc, argvW, envpW);
+    int exitCode = mongo::mongoDbMain(argc, wcl.argv(), wcl.envp());
+    mongo::quickExit(exitCode);
+}
+#else
+int main(int argc, char* argv[], char** envp) {
+    int exitCode = mongo::mongoDbMain(argc, argv, envp);
+    mongo::quickExit(exitCode);
+}
+#endif