From 459123928ab5eb8fa3994a7d812ee9ec5838c0f2 Mon Sep 17 00:00:00 2001
From: Niklas Halle <niklas@niklashalle.net>
Date: Thu, 28 May 2020 13:59:46 +0200
Subject: erstes gedöns
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---
 03_exercise/cli/client.c | 67 +++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 61 insertions(+), 6 deletions(-)

(limited to '03_exercise/cli')

diff --git a/03_exercise/cli/client.c b/03_exercise/cli/client.c
index 48bf724..3cd6f1b 100644
--- a/03_exercise/cli/client.c
+++ b/03_exercise/cli/client.c
@@ -1,13 +1,68 @@
 #include <stdio.h>
+#include <string.h>
 #include <stdlib.h>
 
+#include <unistd.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
 #define PORT 9000
 #define HOST "127.0.0.1"
 
-int main()
-{
-	getc(stdin);
-	printf("Client Exit\n");
-	
-	return 0;
+static inline void die(const char *msg) {
+    perror(msg);
+    exit(-1);
+}
+
+int main() {
+    struct sockaddr_in addr = {
+            .sin_family = AF_INET,
+            .sin_port = htons(PORT),
+            .sin_addr.s_addr = inet_addr(HOST)
+    };
+    char buf[256];
+    int  cfd;
+
+    if ((cfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+        die("Could not open socket");
+
+    if (connect(cfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
+        die("Could not connect to socket");
+
+    char      *line = NULL;
+    size_t    cap   = 0;
+    __ssize_t length;
+
+    while (1) {
+        if ((length = getline(&line, &cap, stdin)) < 0) {
+            fprintf(stderr, "Failed to read from STDIN");
+            fflush(stderr);
+            exit(-1);
+        }
+
+        if (strspn(line, " \n\t") == strlen(line)) {
+            // skip empty lines - empty being just spaces or tabs
+            continue;
+        }
+
+        line[length - 1] = '\0'; // cut the line feed
+
+        if (strcmp(line, "exit") == 0) {
+            break;
+        }
+
+        strncpy(buf, line, strlen(line));
+
+        if (write(cfd, buf, sizeof(buf)) < 0)
+            die("Could not send message");
+
+        if (read(cfd, buf, sizeof(buf)) < 0)
+            die("Could not receive message");
+
+        printf("$> %s\n", buf);
+    }
+
+    close(cfd);
+    return 0;
 }
-- 
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