void
disconnectBrailleResource (
BrailleDisplay *brl,
BrailleSessionEnder *endSession
) {
if (brl->gioEndpoint) {
if (endSession) endSession(brl);
drainBrailleOutput(brl, 0);
gioDisconnectResource(brl->gioEndpoint);
brl->gioEndpoint = NULL;
}
}
static int
writeData (BrailleDisplay *brl, const unsigned char *bytes, int count) {
ssize_t result = serialWriteData(serialDevice, bytes, count);
if (result == -1) {
logSystemError("write");
return 0;
}
drainBrailleOutput(brl, 0);
brl->writeDelay += (result * 1000 / serialCharactersPerSecond) + POST_COMMAND_DELAY;
return 1;
}
int
probeBrailleDisplay (
BrailleDisplay *brl, unsigned int retryLimit,
GioEndpoint *endpoint, int inputTimeout,
BrailleRequestWriter *writeRequest,
BraillePacketReader *readPacket, void *responsePacket, size_t responseSize,
BrailleResponseHandler *handleResponse
) {
unsigned int retryCount = 0;
if (!endpoint) endpoint = brl->gioEndpoint;
while (writeRequest(brl)) {
drainBrailleOutput(brl, 0);
while (gioAwaitInput(endpoint, inputTimeout)) {
size_t size = readPacket(brl, responsePacket, responseSize);
if (!size) break;
{
BrailleResponseResult result = handleResponse(brl, responsePacket, size);
switch (result) {
case BRL_RSP_DONE:
return 1;
case BRL_RSP_UNEXPECTED:
logUnexpectedPacket(responsePacket, size);
case BRL_RSP_CONTINUE:
break;
default:
logMessage(LOG_WARNING, "unimplemented braille response result: %u", result);
case BRL_RSP_FAIL:
return 0;
}
}
}
if (errno != EAGAIN)
#ifdef ETIMEDOUT
if (errno != ETIMEDOUT)
#endif /* ETIMEDOUT */
break;
if (retryCount == retryLimit) break;
retryCount += 1;
}
return 0;
}
int
showBrailleText (const char *mode, const char *text, int minimumDelay) {
int ok = writeBrailleText(mode, text);
drainBrailleOutput(&brl, minimumDelay);
return ok;
}
