From 0c5f075ed0aa99b5adc537a3173e0bd11e198efd Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sun, 16 Aug 2020 02:16:47 +0200
Subject: Cleaned up main and added simple usage message

---
 main.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/main.c b/main.c
index ebe6bfe..4b5cb59 100644
--- a/main.c
+++ b/main.c
@@ -1,4 +1,4 @@
-#include <string.h>
+#include <stdio.h>
 #include <sys/epoll.h>
 
 #include <lauxlib.h>
@@ -7,6 +7,16 @@
 
 #include "plop.h"
 
+/// Prints program usage to standard error.
+/// \param name Name of the executable from argv
+static void usage(char * name)
+{
+	// TODO: Extend command line interface with e.g. getopt.
+	dprintf(2,
+		"Usage: %s <port> <handler>\n",
+		name);
+}
+
 /// Standard entry point for the program.
 /// \param argc Argument count
 /// \param argv Argument array
@@ -18,19 +28,20 @@ int main(int argc, char ** argv)
 
 	if (3 != argc)
 	{
-		return 1; // TODO: Document error codes/print usage information
+		usage(argv[0]);
+		return 1; // TODO: Handle errors properly in main().
 	}
 
 	if (LUA_OK != load_handler(L, argv[2]))
 	{
-		return 2; // TODO: Document error codes/print usage information
+		return 2;
 	}
 
 	const int efd = epoll_create1(0);
 
 	if (-1 == efd)
 	{
-		return 3; // TODO: Handle errors properly
+		return 3;
 	}
 
 	struct epoll_event e;
@@ -40,7 +51,7 @@ int main(int argc, char ** argv)
 
 	if (-1 == epoll_ctl(efd, EPOLL_CTL_ADD, server, &e))
 	{
-		return 4; // TODO: Handle errors properly
+		return 4;
 	}
 
 	static const int MAX_EVENTS = 20;
@@ -52,7 +63,7 @@ int main(int argc, char ** argv)
 
 		if (-1 == evc)
 		{
-			return 5; // TODO: Handle errors properly
+			return 5;
 		}
 
 		for (int i = 0; i < evc; ++i)
@@ -61,14 +72,14 @@ int main(int argc, char ** argv)
 			{
 				if (-1 == handle_server(L, efd, server))
 				{
-					return 6; // TODO: Handle errors properly
+					return 6;
 				}
 			}
 			else
 			{
 				if (-1 == handle_client(L, &events[i]))
 				{
-					return 7; // TODO: Handle errors properly
+					return 7;
 				}
 			}
 		}
-- 
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