Fix yhirose#315

Author: yhirose

README.md

@@ -50,21 +50,24 @@ svr.listen_after_bind();
 ### Static File Server
 
 ```cpp
-svr.set_base_dir("./www"); // This is same as `svr.set_base_dir("./www", "/")`;
+auto ret = svr.set_base_dir("./www"); // This is same as `svr.set_base_dir("./www", "/")`;
+if (!ret) {
+  // The specified base directory doesn't exist...
+}
 
-// User defined file extension and MIME type mappings
-svr.set_file_extension_and_mimetype_mapping("cc", "text/x-c");
-svr.set_file_extension_and_mimetype_mapping("cpp", "text/x-c");
-svr.set_file_extension_and_mimetype_mapping("hh", "text/x-h");
-```
+// Mount /public to ./www directory
+ret = svr.set_base_dir("./www", "/public");
 
-```cpp
-svr.set_base_dir("./www", "/public");
+// Mount /public to ./www1 and ./www2 directories
+ret = svr.set_base_dir("./www1", "/public"); // 1st order to search
+ret = svr.set_base_dir("./www2", "/public"); // 2nd order to search
 ```
 
 ```cpp
-svr.set_base_dir("./www1", "/public"); // 1st order
-svr.set_base_dir("./www2", "/public"); // 2nd order
+// User defined file extension and MIME type mappings
+svr.set_file_extension_and_mimetype_mapping("cc", "text/x-c");
+svr.set_file_extension_and_mimetype_mapping("cpp", "text/x-c");
+svr.set_file_extension_and_mimetype_mapping("hh", "text/x-h");
 ```
 
 The followings are built-in mappings:

example/simplesvr.cc

@@ -122,7 +122,10 @@ int main(int argc, const char **argv) {
   auto base_dir = "./";
   if (argc > 2) { base_dir = argv[2]; }
 
-  svr.set_base_dir(base_dir);
+  if (!svr.set_base_dir(base_dir)) {
+    cout << "The specified base directory doesn't exist...";
+    return 1;
+  }
 
   cout << "The server started at port " << port << "...";