diff --git a/main.c b/main.c
index 85770ac..5bd1304 100644
--- a/main.c
+++ b/main.c
@@ -1,59 +1,27 @@
-/*                                                            -*- C -*-
- * Copyright (c) 2001-2006  Motoyuki Kasahara
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the project nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-/*
- * 使用方法:
- *     initexit
- * 例:
- *     initexit
- * 説明:
- *     EB ライブラリの初期化、後始末をしてみます。
- *     プログラムの外側から見れば、これは何の意味もない動作です。
- */
 #include <stdio.h>
-#include <stdlib.h>
 
 #include <eb/eb.h>
 #include <eb/error.h>
 
-int main(int argc, char *argv[])
-{
-    EB_Error_Code error_code;
+int dump(const char path[]) {
+    (void) path;
 
-    /* EB ライブラリを初期化。*/
-    error_code = eb_initialize_library();
+    const EB_Error_Code error_code = eb_initialize_library();
     if (error_code != EB_SUCCESS) {
-        fprintf(stderr, "%s: failed to initialize EB Library, %s: %s\n",
-            argv[0], eb_error_message(error_code), argv[1]);
-        exit(1);
+        perror("error: failed to initialize eb\n");
+        return 1;
     }
 
-    /* EB ライブラリの利用を終了。*/
+
     eb_finalize_library();
-    exit(0);
+    return 0;
+}
+
+int main(int argc, char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "usage: %s path\n", argv[0]);
+        return 1;
+    }
+
+    return dump(argv[1]);
 }