From 9120732acc43cf3e2a42152331fca16a84226635 Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Mon, 22 Nov 2021 20:54:21 +0100
Subject: tdwl: add ex

---
 Year_3/TSDWL/ex_20191218/serverA.c | 74 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 Year_3/TSDWL/ex_20191218/serverA.c

(limited to 'Year_3')

diff --git a/Year_3/TSDWL/ex_20191218/serverA.c b/Year_3/TSDWL/ex_20191218/serverA.c
new file mode 100644
index 0000000..f13835a
--- /dev/null
+++ b/Year_3/TSDWL/ex_20191218/serverA.c
@@ -0,0 +1,74 @@
+#include <arpa/inet.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+void
+print_buffer_digits(char* buffer, int n)
+{
+    char* ch = buffer;
+    int i;
+
+    for (i = 0; i < n && isdigit(*ch); ++i, ch++) {
+        printf("%c", *ch);
+    }
+    printf("\n");
+}
+
+int
+main(int argc, char* argv[])
+{
+    int sockfd, clientfd;
+    struct sockaddr_in addr;
+    socklen_t addrlen;
+    char buffer[1024];
+    int nbytes, ntotbytes;
+
+    if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
+        perror("socket");
+        exit(1);
+    }
+
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(7777);
+    addr.sin_addr.s_addr = INADDR_ANY;
+    addrlen = sizeof(addr);
+
+    if (bind(sockfd, (struct sockaddr*)&addr, addrlen) == -1) {
+        perror("bind");
+        exit(1);
+    }
+
+    if (listen(sockfd, 1) == -1) {
+        perror("listen");
+        exit(1);
+    }
+
+    while (1) {
+        if ((clientfd = accept(sockfd, (struct sockaddr*)&addr, &addrlen)) == -1) {
+            perror("accept");
+            continue;
+        }
+
+        ntotbytes = 0;
+
+        while ((nbytes = read(clientfd, buffer, sizeof(buffer) - ntotbytes)) != 0) {
+            if (nbytes == -1) {
+                perror("error reading");
+                goto closeclient;
+            }
+            ntotbytes += nbytes;
+        }
+
+        print_buffer_digits(buffer, ntotbytes);
+
+    closeclient:
+        close(clientfd);
+    }
+
+    close(sockfd);
+    return 0;
+}
-- 
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