From 5e4275ac5bc0f21a7926ab5332edf80da435fef5 Mon Sep 17 00:00:00 2001
From: Nick Krichevsky <nick@ollien.com>
Date: Mon, 3 Sep 2018 18:54:02 -0400
Subject: [PATCH] Add basic server argparsing

---
 client/http_client.c   |  1 +
 client/http_socket.h   |  2 --
 common/socket_helper.h |  2 ++
 server/http_server.c   | 16 ++++++++++++++++
 server/http_server.h   |  7 +++++++
 5 files changed, 26 insertions(+), 2 deletions(-)
 create mode 100644 server/http_server.c
 create mode 100644 server/http_server.h

diff --git a/client/http_client.c b/client/http_client.c
index ae9cde6..eb6949a 100644
--- a/client/http_client.c
+++ b/client/http_client.c
@@ -1,5 +1,6 @@
 #include "http_client.h"
 #include "../common/http_types.h"
+#include "../common/socket_helper.h"
 #include "http_socket.h"
 #include <stdbool.h>
 #include <stdio.h>
diff --git a/client/http_socket.h b/client/http_socket.h
index 634a4b5..bc58468 100644
--- a/client/http_socket.h
+++ b/client/http_socket.h
@@ -6,8 +6,6 @@
 #include <time.h>
 
 #define HTTP_VERSION "HTTP/1.1"
-#define MIN_PORT 1
-#define MAX_PORT 65535
 
 struct response_info {
     char *contents;
diff --git a/common/socket_helper.h b/common/socket_helper.h
index 1975f28..6e539f8 100644
--- a/common/socket_helper.h
+++ b/common/socket_helper.h
@@ -3,6 +3,8 @@
 
 #include "http_types.h"
 
+#define MIN_PORT 1
+#define MAX_PORT 65535
 #define BUFFER_SIZE 1024
 #define HEADER_CONTENT_LENGTH "Content-Length"
 #define HEADER_TRANSFER_ENCODING "Transfer-Encoding"
diff --git a/server/http_server.c b/server/http_server.c
new file mode 100644
index 0000000..48469b4
--- /dev/null
+++ b/server/http_server.c
@@ -0,0 +1,16 @@
+#include "http_server.h"
+#include "../common/socket_helper.h"
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char* argv[]) {
+    if (argc != 2) {
+        printf("%s", USAGE_STRING);
+    }
+    char *port = argv[1];
+    long port_num = strtol(port, NULL, 10);
+    if (port_num < MIN_PORT || port_num > MAX_PORT || errno == ERANGE || errno == EINVAL) {
+        printf("%s", PORT_ERROR);
+    }
+}
diff --git a/server/http_server.h b/server/http_server.h
new file mode 100644
index 0000000..7262743
--- /dev/null
+++ b/server/http_server.h
@@ -0,0 +1,7 @@
+#ifndef HTTP_SERVER_H
+#define HTTP_SERVER_H
+
+#define USAGE_STRING "Usage: ./http_server port"
+#define PORT_ERROR "Port must be a number in the range 1-65535"
+
+#endif