From 2821f125c91c192cdd28997e78f366f2db2d39c4 Mon Sep 17 00:00:00 2001
From: Niklas Halle <niklas@niklashalle.net>
Date: Sat, 6 Jun 2020 17:19:55 +0200
Subject: stuff works

---
 03_exercise/cli/client   | Bin 27408 -> 28384 bytes
 03_exercise/cli/client.c | 154 +++++++++++++++++++++++++++--------------------
 2 files changed, 89 insertions(+), 65 deletions(-)

(limited to '03_exercise/cli')

diff --git a/03_exercise/cli/client b/03_exercise/cli/client
index 8da5d5a..0fcf5c1 100755
Binary files a/03_exercise/cli/client and b/03_exercise/cli/client differ
diff --git a/03_exercise/cli/client.c b/03_exercise/cli/client.c
index d64dd62..c1bc5d1 100644
--- a/03_exercise/cli/client.c
+++ b/03_exercise/cli/client.c
@@ -8,20 +8,21 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <signal.h>
 
 #define PORT 9000
 #define HOST "127.0.0.1"
 
 #define BUF_SIZE 2048
 
-int cfd;
+int sock;
 
 /* Signal Handler for SIGINT */
 void sigintHandler(int sig_num) {
     errno = 0;
-    if (fcntl(cfd, F_GETFD) != -1 || errno != EBADF) {
-        write(cfd, "exit\n", 6);
-        close(cfd);
+    if (fcntl(sock, F_GETFD) != -1 || errno != EBADF) {
+        write(sock, "exit\n", 6);
+        close(sock);
     }
     printf("Terminating client\n");
     fflush(stdout);
@@ -81,86 +82,109 @@ void send_file(int server_fd, char *path) {
     close(file_fd);
 }
 
+#define BREAK    1
+#define CONTINUE 2
+
+int parse(int server_sock, char *buffer, ssize_t length) {
+    char cmd[4];
+    char path[BUF_SIZE - 3];
+    memcpy(cmd, buffer, 3);
+    cmd[3] = 0;
+    memcpy(path, buffer + 4, BUF_SIZE - 4);
+    path[strlen(path) - 1] = 0;
+    if (strcmp(cmd, "put") == 0) {
+        if (strlen(path) == 0) {
+            fprintf(stderr, "path missing\n");
+        } else {
+            printf("got put with %s\n", path);
+            send_file(sock, path);
+        }
+        return CONTINUE;
+    }
+
+    buffer[length] = '\0';
+
+    if (strspn(buffer, " \n\t") == strlen(buffer)) {
+        // skip empty lines - empty being just spaces or tabs
+        return CONTINUE;
+    }
+
+    if (write(server_sock, buffer, strlen(buffer)) < 0)
+        die("Could not send message");
+
+    if (strcmp(buffer, "exit\n") == 0) {
+        return BREAK;
+    }
+
+    return 0;
+}
+
+void read_stdin(int *done);
+
+void read_server_sock(int *done);
+
 int main() {
+    setvbuf(stdout, NULL, _IONBF, 0);
+
     struct sockaddr_in addr = {
             .sin_family = AF_INET,
             .sin_port = htons(PORT),
             .sin_addr.s_addr = inet_addr(HOST)
     };
-    char               buf[BUF_SIZE];
 
-    if ((cfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
         die("Could not open socket");
 
-    if (connect(cfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
+    if (connect(sock, (struct sockaddr *) &addr, sizeof(addr)) < 0)
         die("Could not connect to socket");
 
-    char      *line = NULL;
-    size_t    cap   = 0;
-    __ssize_t length;
+    signal(SIGINT, &sigintHandler);
 
-    if (read(cfd, buf, BUF_SIZE) < 0)
-        die("Could not receive message");
+    pid_t pid = fork();
 
-    printf("%s\n", buf);
-    memset(buf, 0, BUF_SIZE);
-
-    while (1) {
-        printf("$> ");
-        //printf("[C] awaiting command\n");
-        if ((length = getline(&line, &cap, stdin)) < 0) {
-            fprintf(stderr, "Failed to read from STDIN");
-            fflush(stderr);
-            exit(-1);
-        }
+    int done = 0;
+    if (pid == 0) {
+        read_stdin(&done);
+    } else {
+        read_server_sock(&done);
+    }
 
-        if (strspn(line, " \n\t") == strlen(line)) {
-            // skip empty lines - empty being just spaces or tabs
-            continue;
-        }
+    close(sock);
+    return 0;
+}
 
-        char cmd[4];
-        char path[BUF_SIZE - 3];
-        memcpy(cmd, line, 3);
-        cmd[3] = 0;
-        memcpy(path, line + 4, BUF_SIZE - 4);
-        path[strlen(path) - 1] = 0;
-        printf("cmd: \"%s\"\n", cmd);
-        printf("path: \"%s\"\n", path);
-        if (strcmp(cmd, "put") == 0) {
-            if (strlen(path) == 0) {
-                fprintf(stderr, "path missing\n");
-            } else {
-                printf("got put with %s\n", path);
-                send_file(cfd, path);
+void read_server_sock(int *done) {
+    char    server_buffer[BUF_SIZE];
+    ssize_t length;
+
+    while (!*done) {
+        if ((length = read(sock, server_buffer, BUF_SIZE)) > 0) {
+            server_buffer[length] = '\0';
+            printf("%s", server_buffer);
+            if (server_buffer[length - 1] == '\n') {
+                printf("$> ");
+                fflush(stdout);
             }
-            free(line);
-            line = NULL;
-            continue;
         }
+    }
+}
 
-        strncpy(buf, line, strlen(line) + 1);
-
-        //printf("[C] pre send: \"%s\"\n", buf);
-
-        if (write(cfd, buf, strlen(line)) < 0)
-            die("Could not send message");
 
-        if (strcmp(line, "exit\n") == 0) {
-            free(line);
-            line = NULL;
-            break;
+void read_stdin(int *done) {
+    char    stdinp_buffer[BUF_SIZE];
+    ssize_t length;
+
+    while (!*done) {
+        if ((length = read(STDIN_FILENO, stdinp_buffer, BUF_SIZE)) > 0) {
+            switch (parse(sock, stdinp_buffer, length)) {
+                case CONTINUE:
+                    continue;
+                case BREAK:
+                    *done = 1;
+                    break;
+                default:
+                    break;
+            }
         }
-
-        if (read(cfd, buf, BUF_SIZE) < 0)
-            die("Could not receive message");
-
-        printf("%s", buf);
-        memset(buf, 0, BUF_SIZE);
-        free(line);
-        line = NULL;
     }
-
-    close(cfd);
-    return 0;
 }
-- 
cgit v1.2.3-54-g00ecf