1 /* ttt-client.c - client handling code for tic-tac-toe game server
3 * Copyright © 2005 Carl Worth
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2, or (at your option)
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 * Author: Carl Worth <cworth@cworth.org>
22 #include "ttt-client.h"
24 #include "ttt-command.h"
25 #include "ttt-error.h"
27 #include "ttt-server.h"
28 #include "ttt-socket.h"
29 #include "ttt-token.h"
32 pthread_mutex_t mutex;
41 char **request_strings;
42 int num_request_strings;
45 typedef ttt_error_t (*ttt_command_func_t) (ttt_client_t *client,
50 _ttt_client_execute_helo (ttt_client_t *client,
54 typedef struct _ttt_command_description {
58 ttt_command_func_t execute;
59 } ttt_command_description_t;
61 ttt_command_description_t command_descriptions[] = {
62 {"HELO", 0, 1, _ttt_client_execute_helo}
66 _ttt_client_execute_helo (ttt_client_t *client,
74 ttt_client_set_name (client, args[0]);
76 error = ttt_server_register_client (client->server, client);
80 xasprintf (&response, "HELO %s %s %s\n", client->name,
81 ttt_server_get_host (client->server),
82 ttt_server_get_port (client->server));
84 ttt_client_send (client, response);
88 return TTT_ERROR_NONE;
91 #define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(arr[0]))
94 _free_request (ttt_client_t *client);
97 _ttt_client_init (ttt_client_t *client,
103 pthread_mutex_init (&client->mutex, NULL);
105 client->server = server;
106 client->socket = socket;
108 file = xfdopen (socket, "r");
109 yylex_init(&client->scanner);
110 yyset_in (file, client->scanner);
112 client->request_strings = NULL;
113 client->num_request_strings = 0;
119 _ttt_client_fini (ttt_client_t *client)
121 pthread_mutex_lock (&client->mutex);
123 ttt_server_unregister_client (client->server, client);
128 yylex_destroy (client->scanner);
129 shutdown (client->socket, SHUT_RDWR);
131 _free_request (client);
133 pthread_mutex_unlock (&client->mutex);
135 pthread_mutex_destroy (&client->mutex);
138 /* XXX: The memory management for the request strings is pretty cheesy. */
140 _append_to_request (ttt_client_t *client,
143 client->num_request_strings++;
144 client->request_strings =
145 xrealloc (client->request_strings,
146 client->num_request_strings * sizeof (char *));
148 client->request_strings[client->num_request_strings - 1] = xstrdup (string);
152 _free_request (ttt_client_t *client)
156 for (i = 0; i < client->num_request_strings; i++)
157 free (client->request_strings[i]);
159 free (client->request_strings);
161 client->request_strings = NULL;
162 client->num_request_strings = 0;
166 _read_request (ttt_client_t *client)
170 _free_request (client);
173 token = yylex (client->scanner);
174 /* Yes, EOF in two different enums is pretty ugly. */
175 if (token == TTT_TOKEN_EOF)
176 return TTT_STATUS_EOF;
178 if (token == TTT_TOKEN_NEWLINE) {
179 if (client->num_request_strings)
180 return TTT_STATUS_SUCCESS;
185 assert (token == TTT_TOKEN_STRING);
187 _append_to_request (client, yyget_text (client->scanner));
192 _execute_request (ttt_client_t *client)
196 char *command = client->request_strings[0];
197 int num_args = client->num_request_strings-1;
198 ttt_command_description_t *desc;
200 for (i=0; i < strlen (command); i++)
201 command[i] = toupper (command[i]);
203 for (i=0; i < ARRAY_SIZE(command_descriptions); i++) {
204 desc = &command_descriptions[i];
205 if (strcmp(command, desc->command) == 0) {
206 if ((num_args < desc->args_min) || (num_args > desc->args_max))
207 return TTT_ERROR_SYNTAX;
208 return (desc->execute) (client, &client->request_strings[1], num_args);
212 return TTT_ERROR_COMMAND;
216 _handle_requests_thread (void *closure)
220 ttt_client_t *client = closure;
224 status = _read_request (client);
225 if (status == TTT_STATUS_EOF)
230 error = _execute_request (client);
232 ttt_client_send (client, ttt_error_string (error));
235 _ttt_client_fini (client);
241 /* Exported: See ttt-client.h for documentation. */
243 ttt_client_new (void *closure, int client_socket)
245 ttt_server_t *server = closure;
246 ttt_client_t *client;
249 client = xmalloc (sizeof (ttt_client_t));
251 _ttt_client_init (client, server, client_socket);
253 err = pthread_create (&client->thread, NULL,
254 _handle_requests_thread, client);
256 fprintf (stderr, "Error: pthread_create failed: %s. Aborting.\n",
262 /* Exported: See ttt-client.h for documentation. */
264 ttt_client_send (ttt_client_t *client, const char *message)
266 pthread_mutex_lock (&client->mutex);
268 ttt_socket_write (client->socket, message, strlen (message));
270 pthread_mutex_unlock (&client->mutex);
273 /* Exported: See ttt-client.h for documentation. */
275 ttt_client_get_name (ttt_client_t *client)
280 /* Exported: See ttt-client.h for documentation. */
282 ttt_client_set_name (ttt_client_t *client, const char *name)
285 client->name = xstrdup (name);