client: pass the client struct to processCommand()

Start exporting the client struct as an opaque struct.  For now, pass
it only to processCommand() and processListOfCommands(), and provide a
function to extract the socket handle.  Later, we will propagate the
pointer to all command implementations, and of course to
client_print() etc.

src/client.c

@@ -324,6 +324,14 @@ void client_new(int fd, const struct sockaddr *addr)
 	       sockaddr_to_tmp_string(addr));
 }
 
+int client_get_fd(struct client *client)
+{
+	assert(client != NULL);
+	assert(client->fd >= 0);
+
+	return client->fd;
+}
+
 static int client_process_line(struct client *client)
 {
 	int ret = 1;
@@ -335,7 +343,7 @@ static int client_process_line(struct client *client)
 			      "list\n", client->num);
 
 			global_expired = 0;
-			ret = processListOfCommands(client->fd,
+			ret = processListOfCommands(client,
 						    &(client->permission),
 						    &global_expired,
 						    client->cmd_list_OK,
@@ -384,7 +392,7 @@ static int client_process_line(struct client *client)
 		} else {
 			DEBUG("client %i: process command \"%s\"\n",
 			      client->num, line);
-			ret = processCommand(client->fd,
+			ret = processCommand(client,
 					     &(client->permission), line);
 			DEBUG("client %i: command returned %i\n",
 			      client->num, ret);

src/client.h

@@ -21,6 +21,8 @@
 
 #include "os_compat.h"
 
+struct client;
+
 void client_manager_init(void);
 void client_manager_deinit(void);
 int client_manager_io(void);
@@ -28,6 +30,13 @@ void client_manager_expire(void);
 
 void client_new(int fd, const struct sockaddr *addr);
 
+/**
+ * Return the file descriptor of this client's socket.  This function
+ * will be removed once we have migrated to passing the client struct
+ * everywhere.
+ */
+int client_get_fd(struct client *client);
+
 int client_print(int fd, const char *buffer, size_t len);
 
 #endif

src/command.c

@@ -34,6 +34,7 @@
 #include "ack.h"
 #include "audio.h"
 #include "dbUtils.h"
+#include "client.h"
 #include "os_compat.h"
 
 #define COMMAND_PLAY           	"play"
@@ -1204,9 +1205,11 @@ static CommandEntry *getCommandEntryFromString(char *string, int *permission)
 	return cmd;
 }
 
-static int processCommandInternal(int fd, mpd_unused int *permission,
+static int processCommandInternal(struct client *client,
+				  mpd_unused int *permission,
 				  char *commandString, struct strnode *cmdnode)
 {
+	int fd = client_get_fd(client);
 	int argc;
 	char *argv[COMMAND_ARGV_MAX] = { NULL };
 	CommandEntry *cmd;
@@ -1232,9 +1235,10 @@ static int processCommandInternal(int fd, mpd_unused int *permission,
 	return ret;
 }
 
-int processListOfCommands(int fd, int *permission, int *expired,
+int processListOfCommands(struct client *client, int *permission, int *expired,
 			  int listOK, struct strnode *list)
 {
+	int fd = client_get_fd(client);
 	struct strnode *cur = list;
 	int ret = 0;
 
@@ -1243,7 +1247,7 @@ int processListOfCommands(int fd, int *permission, int *expired,
 	while (cur) {
 		DEBUG("processListOfCommands: process command \"%s\"\n",
 		      cur->data);
-		ret = processCommandInternal(fd, permission, cur->data, cur);
+		ret = processCommandInternal(client, permission, cur->data, cur);
 		DEBUG("processListOfCommands: command returned %i\n", ret);
 		if (ret != 0 || (*expired) != 0)
 			goto out;
@@ -1257,9 +1261,9 @@ out:
 	return ret;
 }
 
-int processCommand(int fd, int *permission, char *commandString)
+int processCommand(struct client *client, int *permission, char *commandString)
 {
-	return processCommandInternal(fd, permission, commandString, NULL);
+	return processCommandInternal(client, permission, commandString, NULL);
 }
 
 mpd_fprintf_ void commandError(int fd, int error, const char *fmt, ...)

src/command.h

@@ -27,10 +27,14 @@
 #define COMMAND_RETURN_CLOSE	20
 #define COMMAND_MASTER_READY	30
 
-int processListOfCommands(int fd, int *permission, int *expired,
+struct client;
+
+int processListOfCommands(struct client *client,
+			  int *permission, int *expired,
 			  int listOK, struct strnode *list);
 
-int processCommand(int fd, int *permission, char *commandString);
+int processCommand(struct client *client,
+		   int *permission, char *commandString);
 
 void initCommands(void);