1 files changed, 50 insertions, 0 deletions
diff --git a/Semestr 4/sieci/pracownia2/router/network_addr.c b/Semestr 4/sieci/pracownia2/router/network_addr.c
new file mode 100644
index 0000000..a65f48c
--- /dev/null
+++ b/Semestr 4/sieci/pracownia2/router/network_addr.c
@@ -0,0 +1,50 @@
+#include "network_addr.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+struct in_addr _get_broadcast_address(struct in_addr addr, uint16_t netmask) {
+  struct in_addr result = addr;
+  /* bitshift by more than 31 is UB */
+  if (netmask < 32) {
+    result.s_addr |= ~((1<<netmask) - 1);
+  }
+  return result;
+}
+
+struct in_addr _get_network_address(struct in_addr addr, uint16_t netmask) {
+  struct in_addr result = addr;
+  if (netmask == 0) {
+    addr.s_addr = 0;
+  }
+  else {
+    result.s_addr &= ~((1 << (32 - netmask)) - 1);
+  }
+  return result;
+}
+
+struct in_addr get_broadcast_address(struct network_addr na) {
+  return _get_broadcast_address(na.addr, na.netmask);
+}
+
+struct in_addr get_network_address(struct network_addr na) {
+  return _get_network_address(na.addr, na.netmask);
+}
+
+void pretty_print(struct network_addr na) {
+  char ip_addr[20];
+  inet_ntop(AF_INET, &na.addr, ip_addr, sizeof(ip_addr));
+  printf("%s/%d distance %d\n", ip_addr, na.netmask, na.distance);
+}
+
+struct network_addr stora(char *str) {
+  struct network_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;
+}