Added client listing

client.c

@@ -81,12 +81,25 @@ static void input_loop(int server_queue_id, const char *client_id) {
       if (send(server_queue_id, &msg) == -1) {
         perror("msgsnd(/msg) failed");
       }
-    } else if (strncmp(buffer, "/list", 5) == 0) {
-      // handle list
+    } else if (strncmp(buffer, "/list ", 6) == 0) {
+        char *offset = buffer + 6;
+
+        if (strcmp(offset, "active") != 0 && strcmp(offset, "all") != 0) {
+            printf("Invalid list type. Use /list active or /list all\n");
+            continue;
+        }
+
+        msgbuf_t msg = {.mtype = List_clients, .sender = ""};
+        strncpy(msg.sender, client_id, COMMAND_LENGTH - 1);
+        strncpy(msg.command, offset, COMMAND_LENGTH - 1);
+        if (send(server_queue_id, &msg) == -1) {
+            perror("msgsnd(/list) failed");
+        }
     } else if (strncmp(buffer, "/mute ", 6) == 0) {
       // handle mute
     } else if (strcmp(buffer, "/quit") == 0) {
-      // exit
+      // TODO: Would be nice to have a way to gracefully logout and not just
+      // depend on heartbeats, maybe
     } else {
       printf("Unknown command\n");
     }
@@ -160,18 +173,6 @@ int main(int argc, char *argv[]) {
     return 0;
   }
 
-  // /* Send a test message to the server */
-  // msgbuf_t test = {.mtype = Message, .command = "u:test2", .sender = ""};
-  // strncpy(test.sender, client_id, COMMAND_LENGTH - 1);
-  // snprintf(test.message, MESSAGE_LENGTH, "Hello from %s", client_id);
-
-  // if (msgsnd(server_queue_id, &test, sizeof(test) - sizeof(long), 0) == -1) {
-  //   printf("DEBUG: test.mtype = %u\n", test.mtype);
-  //   perror("failed while sending a test message");
-  //   cleanup_queue(client_queue_id);
-  //   return 1;
-  // }
-
   while (1) {
     msgbuf_t incoming;
     ssize_t got = msgrcv(client_queue_id, &incoming,
@@ -190,12 +191,33 @@ int main(int argc, char *argv[]) {
     case Message:
       printf("%s: %s\n", incoming.sender, incoming.message);
       break;
+    case List_clients: {
+      // Check the command field for the list type
+      if (strncmp(incoming.command, "active", COMMAND_LENGTH) == 0) {
+        printf("Active clients:\n%s\n", incoming.message);
+      } else {
+        printf("All clients:\n%s\n", incoming.message);
+      }
+      break;
+    }
     case Signal:
+      // Tell the user if the previous message was accepted and/or delivered
+      if (incoming.stype == ACK_ACCEPTED) {
+        printf("Message sent successfully.\n");
+      } else if (incoming.stype == ACK_DELIVERED) {
+        printf("Message delivered to the %s.\n", incoming.command);
+      } else if (incoming.stype == ERR_USER_NOT_FOUND) {
+        printf("Your message could not be delivered: User not found.\n");
+      } else {
+        // Display whatever if I forgot to handle something
+        printf("Your message could not be delivered: Error code %d.\n",
+               incoming.stype);
+      }
 
       break;
     default:
-      printf("Received unknown mtype=%ld stype=%d\n", (long)incoming.mtype,
-             incoming.stype);
+      printf("Received unknown command of mtype=%ld stype=%d\n",
+             (long)incoming.mtype, incoming.stype);
       break;
     }
   }