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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2010 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version. Please see the file LICENSE-GPL for details.
*
* Web Page: http://mielke.cc/brltty/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include <errno.h>
#include "log.h"
#include "device.h"
#include "queue.h"
#include "io_bluetooth.h"
#include "bluetooth_internal.h"
static Queue *bluetoothConnectErrors = NULL;
typedef struct {
uint64_t bda;
int value;
} BluetoothConnectError;
static void
bthDeallocateConnectError (void *item, void *data) {
BluetoothConnectError *error = item;
free(error);
}
static int
bthInitializeConnectErrors (void) {
if (!bluetoothConnectErrors) {
if (!(bluetoothConnectErrors = newQueue(bthDeallocateConnectError, NULL))) {
return 0;
}
}
return 1;
}
static int
bthTestConnectError (const void *item, const void *data) {
const BluetoothConnectError *error = item;
const uint64_t *bda = data;
return error->bda == *bda;
}
static BluetoothConnectError *
bthGetConnectError (uint64_t bda, int add) {
BluetoothConnectError *error = findItem(bluetoothConnectErrors, bthTestConnectError, &bda);
if (error) return error;
if (add) {
if ((error = malloc(sizeof(*error)))) {
error->bda = bda;
error->value = 0;
if (enqueueItem(bluetoothConnectErrors, error)) return error;
free(error);
}
}
return NULL;
}
void
bthForgetConnectErrors (void) {
if (bthInitializeConnectErrors()) deleteElements(bluetoothConnectErrors);
}
static int
bthRememberConnectError (uint64_t bda, int value) {
if (bthInitializeConnectErrors()) {
BluetoothConnectError *error = bthGetConnectError(bda, 1);
if (error) {
error->value = value;
return 1;
}
}
return 0;
}
static int
bthRecallConnectError (uint64_t bda, int *value) {
if (bthInitializeConnectErrors()) {
BluetoothConnectError *error = bthGetConnectError(bda, 0);
if (error) {
*value = error->value;
return 1;
}
}
return 0;
}
static void
bthForgetConnectError (uint64_t bda) {
if (bthInitializeConnectErrors()) {
Element *element = findElement(bluetoothConnectErrors, bthTestConnectError, &bda);
if (element) deleteElement(element);
}
}
static int
bthParseAddress (uint64_t *bda, const char *address) {
const unsigned int width = 8;
const unsigned long mask = (1L << width) - 1L;
int counter = BDA_SIZE;
*bda = 0;
do {
*bda <<= width;
if (*address) {
char *end;
long int value = strtol(address, &end, 0X10);
if (end == address) return 0;
if (value < 0) return 0;
if (value > mask) return 0;
*bda |= value;
if (!*(address = end)) continue;
if (*address != ':') return 0;
if (!*++address) return 0;
}
} while (--counter);
return !*address;
}
BluetoothConnection *
bthOpenConnection (const char *address, uint8_t channel, int force) {
BluetoothConnection *connection;
if ((connection = malloc(sizeof(*connection)))) {
memset(connection, 0, sizeof(*connection));
connection->channel = channel;
if (bthParseAddress(&connection->address, address)) {
int alreadyTried = 0;
if (force) {
bthForgetConnectError(connection->address);
} else {
int value;
if (bthRecallConnectError(connection->address, &value)) {
errno = value;
alreadyTried = 1;
}
}
if (!alreadyTried) {
if ((connection->extension = bthConnect(connection->address, connection->channel))) return connection;
bthRememberConnectError(connection->address, errno);
}
} else {
LogPrint(LOG_ERR, "invalid Bluetooth device address: %s", address);
errno = EINVAL;
}
free(connection);
} else {
LogError("malloc");
}
return NULL;
}
void
bthCloseConnection (BluetoothConnection *connection) {
bthDisconnect(connection->extension);
free(connection);
}
int
isBluetoothDevice (const char **path) {
if (isQualifiedDevice(path, "bluetooth:")) return 1;
if (isQualifiedDevice(path, "bt:")) return 1;
if (isQualifiedDevice(path, "bluez:")) return 1;
return 0;
}
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