1 files changed, 71 insertions, 2 deletions
diff --git a/main.c b/main.c
index 915919d..62a4541 100644
--- a/main.c
+++ b/main.c
@@ -1,14 +1,83 @@
+#define _POSIX_C_SOURCE 200112L
+
 #include "cptc.h"
 
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <stdnoreturn.h>
+
+#include <getopt.h>
 #include <fcntl.h>
 #include <unistd.h>
 
 
 const char *CPTC_token;
 
-int main(void)
+static struct option long_options[] =
+{
+    {"help", no_argument, NULL, 'h'},
+    {"host", no_argument, NULL, 'i'},
+    {"port", no_argument, NULL, 'p'},
+    {0}
+};
+
+noreturn void usage(char *name, bool full)
+{
+    fprintf(
+        full ? stdout : stderr,
+        full ?
+            "usage: %s [-h] [-i/--host IP] [-p/--port PORT]\n"
+            "Also requires CPTC_TOKEN environment variable set to some discord\n"
+            "bot's token\n\n"
+            "Options:\n"
+            "  -h, --help       show this help message and quit\n"
+            "  -i, --host IP    set bind address to IP )default: 127.0.0.1)\n"
+            "  -p, --port PORT  set bind port to PORT (default: 8080)\n"
+        :
+            "Try '%s --help' for more information\n",
+        name
+    );
+    exit(!full);
+}
+
+static bool isnumber(const char *s)
+{
+    for (const char *cp = s; *cp != '\0'; ++cp)
+        if (!isdigit(*cp))
+            return false;
+    return true;
+}
+
+int main(int argc, char **argv)
 {
+    char *address = "127.0.0.1";
+    int port = 8080;
+    int ch;
+
     CPTC_token = getenv("CPTC_TOKEN");
-    CPTC("127.0.0.1", 8080);
+    while ((ch = getopt_long(argc, argv, "hi:p:", long_options, NULL)) != EOF)
+    {
+        switch (ch)
+        {
+        case 'i':
+            address = optarg;
+            break;
+        case 'p':
+            if (!isnumber(optarg))
+            {
+                fprintf(stderr, "%s: port should be an unsigned integer\n", argv[0]);
+                usage(argv[0], false);
+            }
+            port = atoi(optarg);
+            break;
+        case 'h':
+            usage(argv[0], true);
+        default:
+            usage(argv[0], false);
+        }
+    }
+
+    CPTC(address, port);
 }