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-error.h"
26 #include "ttt-server.h"
27 #include "ttt-socket.h"
28 #include "ttt-token.h"
31 pthread_mutex_t mutex;
40 char **request_strings;
41 int num_request_strings;
44 typedef ttt_error_t (*ttt_command_func_t) (ttt_client_t *client,
49 _ttt_client_execute_helo (ttt_client_t *client,
53 typedef struct _ttt_command_description {
57 ttt_command_func_t execute;
58 } ttt_command_description_t;
60 ttt_command_description_t command_descriptions[] = {
61 {"HELO", 1, 1, _ttt_client_execute_helo}
65 _ttt_client_execute_helo (ttt_client_t *client,
73 ttt_client_set_name (client, args[0]);
75 error = ttt_server_register_client (client->server, client);
79 xasprintf (&response, "HELO %s %s %s\n", client->name,
80 ttt_server_get_host (client->server),
81 ttt_server_get_port (client->server));
83 ttt_client_send (client, response);
87 return TTT_ERROR_NONE;
90 #define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(arr[0]))
93 _free_request (ttt_client_t *client);
96 _ttt_client_init (ttt_client_t *client,
102 pthread_mutex_init (&client->mutex, NULL);
104 client->server = server;
105 client->socket = socket;
107 file = xfdopen (socket, "r");
108 yylex_init(&client->scanner);
109 yyset_in (file, client->scanner);
111 client->request_strings = NULL;
112 client->num_request_strings = 0;
118 _ttt_client_fini (ttt_client_t *client)
120 pthread_mutex_lock (&client->mutex);
122 ttt_server_unregister_client (client->server, client);
127 yylex_destroy (client->scanner);
128 shutdown (client->socket, SHUT_RDWR);
130 _free_request (client);
132 pthread_mutex_unlock (&client->mutex);
134 pthread_mutex_destroy (&client->mutex);
137 /* XXX: The memory management for the request strings is pretty cheesy. */
139 _append_to_request (ttt_client_t *client,
142 client->num_request_strings++;
143 client->request_strings =
144 xrealloc (client->request_strings,
145 client->num_request_strings * sizeof (char *));
147 client->request_strings[client->num_request_strings - 1] = xstrdup (string);
151 _free_request (ttt_client_t *client)
155 for (i = 0; i < client->num_request_strings; i++)
156 free (client->request_strings[i]);
158 free (client->request_strings);
160 client->request_strings = NULL;
161 client->num_request_strings = 0;
165 _read_request (ttt_client_t *client)
169 _free_request (client);
172 token = yylex (client->scanner);
173 /* Yes, EOF in two different enums is pretty ugly. */
174 if (token == TTT_TOKEN_EOF)
175 return TTT_STATUS_EOF;
177 if (token == TTT_TOKEN_NEWLINE) {
178 if (client->num_request_strings)
179 return TTT_STATUS_SUCCESS;
184 assert (token == TTT_TOKEN_STRING);
186 _append_to_request (client, yyget_text (client->scanner));
191 _execute_request (ttt_client_t *client)
195 char *command = client->request_strings[0];
196 int num_args = client->num_request_strings-1;
197 ttt_command_description_t *desc;
199 for (i=0; i < strlen (command); i++)
200 command[i] = toupper (command[i]);
202 for (i=0; i < ARRAY_SIZE(command_descriptions); i++) {
203 desc = &command_descriptions[i];
204 if (strcmp(command, desc->command) == 0) {
205 if ((num_args < desc->args_min) || (num_args > desc->args_max))
206 return TTT_ERROR_SYNTAX;
207 return (desc->execute) (client, &client->request_strings[1], num_args);
211 return TTT_ERROR_COMMAND;
215 _handle_requests_thread (void *closure)
219 ttt_client_t *client = closure;
223 status = _read_request (client);
224 if (status == TTT_STATUS_EOF)
229 error = _execute_request (client);
231 ttt_client_send (client, ttt_error_string (error));
234 _ttt_client_fini (client);
240 /* Exported: See ttt-client.h for documentation. */
242 ttt_client_new (void *closure, int client_socket)
244 ttt_server_t *server = closure;
245 ttt_client_t *client;
248 client = xmalloc (sizeof (ttt_client_t));
250 _ttt_client_init (client, server, client_socket);
252 err = pthread_create (&client->thread, NULL,
253 _handle_requests_thread, client);
255 fprintf (stderr, "Error: pthread_create failed: %s. Aborting.\n",
261 /* Exported: See ttt-client.h for documentation. */
263 ttt_client_send (ttt_client_t *client, const char *message)
265 pthread_mutex_lock (&client->mutex);
267 ttt_socket_write (client->socket, message, strlen (message));
269 pthread_mutex_unlock (&client->mutex);
272 /* Exported: See ttt-client.h for documentation. */
274 ttt_client_get_name (ttt_client_t *client)
279 /* Exported: See ttt-client.h for documentation. */
281 ttt_client_set_name (ttt_client_t *client, const char *name)
284 client->name = xstrdup (name);