From 14f0ae5e5b68c78cef56e80d630d1a4611a2835f Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Tue, 23 Nov 2021 21:06:52 +0100
Subject: tsdwl: add exam

---
 Year_3/TSDWL/ex_20131219/socket.c | 95 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 Year_3/TSDWL/ex_20131219/socket.c

diff --git a/Year_3/TSDWL/ex_20131219/socket.c b/Year_3/TSDWL/ex_20131219/socket.c
new file mode 100644
index 0000000..452aa6e
--- /dev/null
+++ b/Year_3/TSDWL/ex_20131219/socket.c
@@ -0,0 +1,95 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+
+char* V[10];
+
+int
+main()
+{
+    int sockfd, clientfd;
+    struct sockaddr_in addr;
+    socklen_t addrlen;
+    int n;
+    char buffer[256];
+    int vi;
+    int i;
+    int is_present;
+    int x_rand;
+
+    srand(time(NULL));
+
+    if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
+        perror("socket");
+        exit(1);
+    }
+
+    addr.sin_family = AF_INET;
+    addr.sin_addr.s_addr = INADDR_ANY;
+    addr.sin_port = htons(7777);
+
+    addrlen = sizeof(addr);
+    if (bind(sockfd, (struct sockaddr*) &addr, addrlen) == -1) {
+        perror("bind");
+        exit(1);
+    }
+
+    if (listen(sockfd, 1) == -1) {
+        perror("listen");
+        exit(1);
+    }
+
+    for (i = 0; i < 10; ++i) {
+        V[i] = malloc(sizeof(char) * 255);
+    }
+    vi = 0;
+
+    while (1) {
+        if ((clientfd = accept(sockfd, (struct sockaddr*) &addr, &addrlen)) == -1) {
+            perror("accept");
+            continue;
+        }
+
+        if ((n = read(clientfd, buffer, sizeof(buffer))) == -1) {
+            perror("read");
+            goto client_close;
+        }
+
+        buffer[n-1] = 0;
+        if (strncmp(buffer, "LIST", 4) == 0) {
+            for (i = 0; i < vi; ++i)
+                printf("%s\n", V[i]);
+        } else {
+            is_present = 0;
+            for (i = 0; i < vi; ++i) {
+                if (strcmp(buffer, V[i]) == 0) {
+                    is_present = 1;
+                    printf("presente\n");
+                }
+            }
+
+            if (!is_present) {
+                if (vi == 9) {
+                    x_rand = rand() % 10;
+                    strcpy(V[x_rand], buffer);
+                } else {
+                    strcpy(V[vi++], buffer);
+                }
+                printf("inserita\n");
+            }
+        }
+client_close:
+        close(clientfd);
+    }
+
+    for (i = 0; i < 10; ++i) {
+        free(V[i]);
+    }
+
+    close(sockfd);
+    return 0;
+}
-- 
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