From 4167f191cec04314082896ca4618663e97b4f4f1 Mon Sep 17 00:00:00 2001
From: Franciszek Malinka <franciszek.malinka@gmail.com>
Date: Sun, 18 Apr 2021 10:26:08 +0200
Subject: Router modularity

---
 Semestr 4/sieci/pracownia2/router/router_addr.c | 32 +++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 Semestr 4/sieci/pracownia2/router/router_addr.c

(limited to 'Semestr 4/sieci/pracownia2/router/router_addr.c')

diff --git a/Semestr 4/sieci/pracownia2/router/router_addr.c b/Semestr 4/sieci/pracownia2/router/router_addr.c
new file mode 100644
index 0000000..1e4c086
--- /dev/null
+++ b/Semestr 4/sieci/pracownia2/router/router_addr.c	
@@ -0,0 +1,32 @@
+#include "router_addr.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+struct in_addr get_broadcast_address(struct router_addr ra) {
+  struct in_addr result = ra.addr;
+  /* bitshift by more than 31 is UB */
+  if (ra.netmask < 32) {
+    result.s_addr |= ~((1<<ra.netmask) - 1);
+  }
+  return result;
+}
+
+void pretty_print(struct router_addr ra) {
+  char ip_addr[20];
+  inet_ntop(AF_INET, &ra.addr, ip_addr, sizeof(ip_addr));
+  printf("%s/%d distance %d\n", ip_addr, ra.netmask, ra.distance);
+}
+
+/* converts string of IP with netmask in CIDR notation to router_addr */
+struct router_addr stora(char *str) {
+  struct router_addr  result;
+  char                addr[20];
+  size_t              ip_preffix = strcspn(str, "/");
+  
+  strncpy(addr, str, strlen(str));
+  addr[ip_preffix] = 0;
+  inet_pton(AF_INET, addr, &(result.addr));
+  result.netmask = atoi(str + ip_preffix + 1);
+  return result;
+}
\ No newline at end of file
-- 
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