13 files changed, 149 insertions, 43 deletions
diff --git a/Semestr 4/ask/lista7/eval.s b/Semestr 4/ask/lista7/eval.s
new file mode 100644
index 0000000..f7340a0
--- /dev/null
+++ b/Semestr 4/ask/lista7/eval.s
@@ -0,0 +1,18 @@
+        .global eval
+
+        .text
+eval:
+        movq %rdi, %rax
+        movq 16(%rsp), %rcx
+        movq 24(%rsp), %rdx
+        movq (%rdx), %rsi
+        movq %rcx, %rdx
+        imulq %rsi, %rdx
+        movq %rdx, (%rdi)
+        movq 8(%rsp), %rdx
+        movq %rdx, %rdi
+        subq %rsi, %rdi
+        movq %rdi, 8(%rax)
+        subq %rcx, %rdx
+        movq %rdx, 16(%rax)
+        ret
+\ No newline at end of file
diff --git a/Semestr 4/ask/lista7/wrap.s b/Semestr 4/ask/lista7/wrap.s
new file mode 100644
index 0000000..6f01dfc
--- /dev/null
+++ b/Semestr 4/ask/lista7/wrap.s
@@ -0,0 +1,18 @@
+        .global wrap
+
+        .text
+wrap:
+        subq $72, %rsp
+        movq %rdx, (%rsp)
+        movq %rsp, %rdx
+        leaq 8(%rsp), %rax
+        pushq %rdx
+        pushq %rsi
+        pushq %rdi
+        movq %rax, %rdi
+        call eval
+        movq 40(%rsp), %rax
+        addq 32(%rsp), %rax
+        imulq 48(%rsp), %rax
+        addq $96, %rsp
+        ret
+\ No newline at end of file
diff --git a/Semestr 4/ask/lista7/zad5.c b/Semestr 4/ask/lista7/zad5.c
new file mode 100644
index 0000000..d65cb4f
--- /dev/null
+++ b/Semestr 4/ask/lista7/zad5.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+
+typedef struct A {
+  long u[2];
+  long *v;
+} SA;
+
+typedef struct B {
+  long p[2];
+  long q;
+} SB;
+
+SB eval(SA s);
+long wrap(long x, long y, long z);
+
+SB eval_decoded(SA a) {
+  SB ret;
+  ret.p[0] = a.u[1] * (*a.v);
+  ret.p[1] = a.u[0] - (*a.v);
+  ret.q = a.u[0] - a.u[1];
+  return ret;
+}
+
+long wrap_decoded(long x, long y, long z) {
+  SA a;
+  a.v = &z;
+  a.u[0] = x;
+  a.u[1] = y;
+  SB b = eval_decoded(a);
+  long result = (b.p[1] + b.p[0]) * b.q;
+  return result;
+}
+
+int main() {
+  printf("%ld\n", wrap(15, 16, 17));
+  printf("%ld\n", wrap_decoded(15, 16, 17));
+  return 0;
+}
+\ No newline at end of file
diff --git a/Semestr 4/ask/lista7/zad5.s b/Semestr 4/ask/lista7/zad5.s
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Semestr 4/ask/lista7/zad5.s
diff --git a/Semestr 4/ask/lista7/zad7.cpp b/Semestr 4/ask/lista7/zad7.cpp
new file mode 100644
index 0000000..073224f
--- /dev/null
+++ b/Semestr 4/ask/lista7/zad7.cpp
@@ -0,0 +1,19 @@
+struct Base {
+  Base(int n) : data(n) {}
+  int data;
+  virtual int doit(int n) { return n - data; }
+};
+struct Derived : Base {
+  Derived(int n) : Base(n + 1) {}
+  int doit(int n) { return n * data; }
+};
+
+int doit(Base *bp) {
+  return bp->doit(1);
+}
+
+int main(int argc, char *argv[]) {
+  Base b = Base(10);
+  Derived d = Derived(20);
+  return doit(&b) + doit(&d);
+}
+\ No newline at end of file
diff --git a/Semestr 4/pstwo/wyklady/Wyklad 8.pdf b/Semestr 4/pstwo/wyklady/Wyklad 8.pdf
new file mode 100644
index 0000000..a635d14
--- /dev/null
+++ b/Semestr 4/pstwo/wyklady/Wyklad 8.pdf
diff --git a/Semestr 4/sieci/pracownia2/router/config.h b/Semestr 4/sieci/pracownia2/router/config.h
index ef8bf47..f83c556 100644
--- a/Semestr 4/sieci/pracownia2/router/config.h
+++ b/Semestr 4/sieci/pracownia2/router/config.h
@@ -5,11 +5,11 @@
 #define TURN_LEN_S 5
 
 #define INFINITY_DIST 16
-#define REACHABILITY_WAIT_TIME 5
+#define REACHABILITY_WAIT_TIME 3
 
 #define DV_DATAGRAM_LEN 9
 
 #define TURN_LEN_MS (1000 * TURN_LEN_S)
 #define TURN_LEN_US (1000000 * TURN_LEN_S)
 
-#endif
-\ No newline at end of file
+#endif
diff --git a/Semestr 4/sieci/pracownia2/router/dist_vector.c b/Semestr 4/sieci/pracownia2/router/dist_vector.c
index f1c8c67..15ad851 100644
--- a/Semestr 4/sieci/pracownia2/router/dist_vector.c
+++ b/Semestr 4/sieci/pracownia2/router/dist_vector.c
@@ -1,5 +1,7 @@
 #include "dist_vector.h"
 #include <stdio.h>
+#include <time.h>
+#include <string.h>
 
 bool is_connected_directly(struct vector_item item) {
   return item.is_connected_directly;
@@ -60,10 +62,8 @@ void update_dv_new_item(list_t *distance_vector, struct vector_item new_item) {
             current->distance = INFINITY_DIST;
             current->reachable = 0;
           }
-        } else if (new_item.distance < INFINITY_DIST) {
-          if (current->distance >= INFINITY_DIST) {
-            current->distance = new_item.distance;
-          }
+        } else {
+          current->distance = new_item.distance;
           current->reachable = 0;
         }
       }
@@ -73,13 +73,21 @@ void update_dv_new_item(list_t *distance_vector, struct vector_item new_item) {
     iterate(distance_vector);
   }
 
-  if (new_entry) {
+  if (new_entry && new_item.reachable < INFINITY_DIST) {
     insert(distance_vector, &new_item, sizeof(new_item));
   }
 }
 
 void print_dv(list_t *distance_vector) {
-  printf("Distance vector:\n");
+  time_t rawtime;
+  struct tm * timeinfo;
+
+  time ( &rawtime );
+  timeinfo = localtime ( &rawtime );
+  char t[100];
+  strcpy(t, asctime(timeinfo));
+  t[strlen(t) - 1] = 0;
+  printf("Distance vector [%s]:\n", t);
   reset(distance_vector);
   while (distance_vector->it != NULL) {
     char addr[20], via_addr[20];
diff --git a/Semestr 4/sieci/pracownia2/router/linked_list.c b/Semestr 4/sieci/pracownia2/router/linked_list.c
index 09f6025..c0f1930 100644
--- a/Semestr 4/sieci/pracownia2/router/linked_list.c
+++ b/Semestr 4/sieci/pracownia2/router/linked_list.c
@@ -9,6 +9,8 @@ node_t *_next(node_t *node) {
 void _insert(node_t **head, void *data, size_t data_size) {
   node_t *new_node = (node_t *)malloc(sizeof(node_t));
   new_node->data = malloc(data_size);  
+  for (int i = 0; i < data_size; i++)
+    *(uint8_t *)(new_node->data + i) = *(uint8_t *)(data + i);
   new_node->next = *head;
   *head = new_node;
 }
diff --git a/Semestr 4/sieci/pracownia2/router/network_addr.h b/Semestr 4/sieci/pracownia2/router/network_addr.h
index 616c64f..6347bbd 100644
--- a/Semestr 4/sieci/pracownia2/router/network_addr.h
+++ b/Semestr 4/sieci/pracownia2/router/network_addr.h
@@ -16,7 +16,7 @@ typedef struct network_addr router_addr;
 /* Returns broadcast address of a given network. */
 struct in_addr get_broadcast_address(struct network_addr na);
 
-/* Returns network address of a given network */
+/* Returns network address of a given network. */
 struct in_addr get_network_address(struct network_addr na);
 
 /* Prints network_addr via stdio. */
diff --git a/Semestr 4/sieci/pracownia2/router/router.c b/Semestr 4/sieci/pracownia2/router/router.c
index 7262ee6..3831aac 100644
--- a/Semestr 4/sieci/pracownia2/router/router.c
+++ b/Semestr 4/sieci/pracownia2/router/router.c
@@ -28,34 +28,6 @@ uint16_t read_configuration(struct network_addr** networks, uint16_t **dists) {
   return n;
 }
 
-void listen_for_routers(int sockfd, int timeout, int networks_number, struct network_addr *networks, uint16_t *dists, list_t *dv) {
-  // printf("Listening for %dms.\n", timeout);
-  char buffer[IP_MAXPACKET + 1];
-  struct sockaddr_in sender;
-
-  while (poll_socket_modify_timeout(sockfd, &timeout)) {
-    size_t buf_len = recv_message(sockfd, buffer, &sender);
-    struct vector_item new_item = parse_message(buffer, &sender);
-    // char addr[20];
-    // inet_ntop(AF_INET, &sender.sin_addr, addr, sizeof(addr));
-    // printf("Via ip: %s\n", addr);
-
-    if (!is_from_network(sender.sin_addr, new_item.network)) {
-      for (int i = 0; i < networks_number; i++) {
-          if (is_from_network(sender.sin_addr, networks[i])) {
-          new_item.distance += dists[i];
-          break;
-        }
-      }
-      new_item.is_connected_directly = false;
-    } 
-
-    update_dv_new_item(dv, new_item);
-  }
-  update_dv_reachability(dv);
-  // printf("Finished listening\n\n");
-}
-
 void router_loop(int sockfd, int networks_number, struct network_addr *networks, uint16_t *dists) {
   list_t dv = create_list();
   init_dv(&dv, networks_number, networks);
@@ -72,7 +44,6 @@ int main() {
   struct network_addr* networks;
   uint16_t *dists;
   int n = read_configuration(&networks, &dists);
-
   int sockfd = get_socket();
   bind_to_port(sockfd, SERVER_PORT);
 
diff --git a/Semestr 4/sieci/pracownia2/router/utils.c b/Semestr 4/sieci/pracownia2/router/utils.c
index 3f9078e..b975934 100644
--- a/Semestr 4/sieci/pracownia2/router/utils.c
+++ b/Semestr 4/sieci/pracownia2/router/utils.c
@@ -38,8 +38,8 @@ long get_time_interval(struct timespec start, struct timespec finish) {
 
 int poll_socket_modify_timeout(int sockfd, int *timeout) {
   if (*timeout < 0) {
-    fprintf(stderr, "poll_socket_modify_timeout: timeout is negative.\n");
-    exit(EXIT_FAILURE);
+    *timeout = 0;
+    return 0;
   }
 
   struct pollfd fds;
@@ -49,9 +49,11 @@ int poll_socket_modify_timeout(int sockfd, int *timeout) {
   fds.fd = sockfd;
   fds.events = POLLIN;
   fds.revents = 0;
-  clock_gettime(CLOCK_REALTIME, &start);
   
+  clock_gettime(CLOCK_REALTIME, &start);
   int result = poll(&fds, 1, *timeout);
+  clock_gettime(CLOCK_REALTIME, &finish);
+  
   if (result == -1) {
     fprintf(stderr, "poll error: %s\n", strerror(errno));
     exit(EXIT_FAILURE);
@@ -61,7 +63,6 @@ int poll_socket_modify_timeout(int sockfd, int *timeout) {
     return 0;
   }
 
-  clock_gettime(CLOCK_REALTIME, &finish);
   *timeout -= get_time_interval(start, finish);
   return result;
 }   
@@ -153,12 +154,40 @@ int _send_item(int sockfd, struct network_addr network, struct vector_item item)
   return result;
 }
 
+void listen_for_routers(int sockfd, int timeout, int networks_number, struct network_addr *networks, uint16_t *dists, list_t *dv) {
+  // printf("Listening for %dms.\n", timeout);
+  char buffer[IP_MAXPACKET + 1];
+  struct sockaddr_in sender;
+
+  while (poll_socket_modify_timeout(sockfd, &timeout)) {
+    size_t buf_len = recv_message(sockfd, buffer, &sender);
+    struct vector_item new_item = parse_message(buffer, &sender);
+    // char addr[20];
+    // inet_ntop(AF_INET, &sender.sin_addr, addr, sizeof(addr));
+    // printf("Via ip: %s\n", addr);
+
+    if (!is_from_network(sender.sin_addr, new_item.network)) {
+      for (int i = 0; i < networks_number; i++) {
+          if (is_from_network(sender.sin_addr, networks[i])) {
+          new_item.distance += dists[i];
+          break;
+        }
+      }
+      new_item.is_connected_directly = false;
+    } 
+
+    update_dv_new_item(dv, new_item);
+  }
+  update_dv_reachability(dv);
+  // printf("Finished listening\n\n");
+}
+
 void propagate_distance_vector(int sockfd, int networks_number, struct network_addr *networks, uint16_t *dists, list_t *dv) {
   for (int i = 0; i < networks_number; i++) {
     reset(dv);
     while (dv->it != NULL) {
       struct vector_item data = *(struct vector_item *)dv->it->data;
-      if (!(get_network_address(data.network).s_addr == get_network_address(networks[i]).s_addr)) {
+      if (!(get_network_address(data.network).s_addr == get_network_address(networks[i]).s_addr) && data.reachable <= REACHABILITY_WAIT_TIME) {
         _send_item(sockfd, networks[i], data);
       }
       iterate(dv);
diff --git a/Semestr 4/sieci/pracownia2/router/utils.h b/Semestr 4/sieci/pracownia2/router/utils.h
index 3642779..edf90d0 100644
--- a/Semestr 4/sieci/pracownia2/router/utils.h
+++ b/Semestr 4/sieci/pracownia2/router/utils.h
@@ -39,6 +39,9 @@ size_t recv_message(int sockfd, char *buffer, struct sockaddr_in *sender);
 /* Parse datagram into a vector item. */
 struct vector_item parse_message(char *buffer, struct sockaddr_in *sender);
 
+/* Listnes for routers for timeout ms. */
+void listen_for_routers(int sockfd, int timeout, int networks_number, struct network_addr *networks, uint16_t *dists, list_t *dv);
+
 /* Propagates dv to all connected networks. */
 void propagate_distance_vector(int sockfd, int networks_number, struct network_addr *networks, uint16_t *dists, list_t *dv);