// This function should return number of bytes read... not status.
static SIZE_OR_ERROR FS_r_given_bus(struct one_wire_query *owq)
{
// Device locking occurs here
struct parsedname *pn = PN(owq);
SIZE_OR_ERROR read_or_error = 0;
LEVEL_DEBUG("About to read <%s> extension=%d size=%d offset=%d",SAFESTRING(pn->path),(int) pn->extension,(int) OWQ_size(owq),(int) OWQ_offset(owq));
if (KnownBus(pn) && BusIsServer(pn->selected_connection)) {
/* The bus is not local... use a network connection instead */
LEVEL_DEBUG("pid=%ld call ServerRead", pthread_self());
// Read afar -- returns already formatted in buffer
read_or_error = ServerRead(owq);
LEVEL_DEBUG("back from server");
//printf("FS_r_given_bus pid=%ld r=%d\n",pthread_self(), read_or_error);
} else {
STAT_ADD1(read_calls); /* statistics */
if (DeviceLockGet(pn) == 0) {
read_or_error = FS_r_local(owq); // this returns status
DeviceLockRelease(pn);
LEVEL_DEBUG("return=%d", read_or_error);
if (read_or_error >= 0) {
// local success -- now format in buffer
read_or_error = OWQ_parse_output(owq); // this returns nr. bytes
}
} else {
LEVEL_DEBUG("Cannot lock bus to perform read") ;
read_or_error = -EADDRINUSE;
}
}
LEVEL_DEBUG("After read is performed (bytes or error %d)", read_or_error);
Debug_OWQ(owq);
return read_or_error;
}
// This function should return number of bytes read... not status.
// Works for all the virtual directories, like statistics, interface, ...
// Doesn't need three-peat and bus was already set or not needed.
static SIZE_OR_ERROR FS_r_virtual(struct one_wire_query *owq)
{
struct parsedname *pn = PN(owq);
SIZE_OR_ERROR read_status = 0;
if (SpecifiedRemoteBus(pn)) {
/* The bus is not local... use a network connection instead */
// Read afar -- returns already formatted in buffer
read_status = ServerRead(owq);
LEVEL_DEBUG("back from server");
Debug_OWQ(owq);
} else {
/* local bus -- any special locking needs? */
STAT_ADD1(read_calls); /* statistics */
switch (pn->type) {
case ePN_structure:
read_status = FS_structure(owq);
break;
case ePN_interface:
BUSLOCK(pn);
read_status = FS_r_local(owq); // this returns status
BUSUNLOCK(pn);
break;
case ePN_statistics:
// reading /statistics/read/tries.ALL
// will cause a deadlock since it calls STAT_ADD1(read_array);
// Should perhaps create a new mutex for this.
// Comment out this STATLOCK until it's solved.
// STATLOCK now done at time of actual read in ow_stats.c
read_status = FS_r_local(owq); // this returns status
break;
default:
read_status = FS_r_local(owq); // this returns status
}
if (read_status >= 0) {
// local success -- now format in buffer
read_status = OWQ_parse_output(owq); // this returns nr. bytes
}
}
LEVEL_DEBUG("return %d", read_status);
return read_status;
}
static SIZE_OR_ERROR OWQ_parse_output_array_with_commas(struct one_wire_query *owq)
{
struct one_wire_query owq_single;
size_t extension;
int len;
size_t used_size = 0;
size_t remaining_size = OWQ_size(owq);
size_t elements = OWQ_pn(owq).selected_filetype->ag->elements;
// loop though all array elements
for (extension = 0; extension < elements; ++extension) {
//printf("OWQ_parse_output_array_with_commas element=%d, size_used=%d, remaining=%d\n",(int)extension,(int)used_size,(int)remaining_size) ;
// Prepare a copy of owq that only points to a single element
memcpy(&owq_single, owq, sizeof(owq_single));
OWQ_pn(&owq_single).extension = extension;
memcpy(&OWQ_val(&owq_single), &OWQ_array(owq)[extension], sizeof(union value_object));
// add the comma first (if not the first element and enough room)
if (used_size > 0) {
if (remaining_size == 0) {
return -EFAULT;
}
OWQ_buffer(owq)[used_size] = ',';
++used_size;
--remaining_size;
}
// Now process the single element
OWQ_buffer(&owq_single) = &OWQ_buffer(owq)[used_size];
OWQ_size(&owq_single) = remaining_size;
len = OWQ_parse_output(&owq_single);
// any error aborts
if (len < 0) {
return len;
}
remaining_size -= len;
used_size += len;
}
return used_size;
}