core: fix libdivecomputer dc_custom callbacks structures

The last time those changed, we forgot to update serial_ftdi. In that change
set_latency had been removed from libdivecomputer and poll and ioctl had been
added. This caused the callbacks to no longer be aligned correctly and the
functions were called with the wrong arguments through the wrong function
pointers, leading to crashes.

Instead of the fragile assumptions about order and type of function pointers,
use named initializers. And while we are at it, fix that for the bluetooth
implementation as well.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

CHANGELOG.md

@@ -1,3 +1,4 @@
+core: fix crashes when using user space FTDI driver
 mobile: add information about the cloud sync state to the Subsurface plate in the menu
 
 ---

core/qtserialbluetooth.cpp

@@ -283,21 +283,13 @@ ble_packet_open(dc_iostream_t **iostream, dc_context_t *context, const char* dev
 	void *io = NULL;
 
 	static const dc_custom_cbs_t callbacks = {
-		qt_ble_set_timeout, /* set_timeout */
-		NULL, /* set_break */
-		NULL, /* set_dtr */
-		NULL, /* set_rts */
-		NULL, /* get_lines */
-		NULL, /* get_received */
-		NULL, /* configure */
-		qt_ble_poll, /* poll */
-		qt_ble_read, /* read */
-		qt_ble_write, /* write */
-		qt_ble_ioctl, /* ioctl */
-		NULL, /* flush */
-		NULL, /* purge */
-		qt_custom_sleep, /* sleep */
-		qt_ble_close, /* close */
+		.set_timeout	= qt_ble_set_timeout,
+		.poll		= qt_ble_poll,
+		.read		= qt_ble_read,
+		.write		= qt_ble_write,
+		.ioctl		= qt_ble_ioctl,
+		.sleep		= qt_custom_sleep,
+		.close		= qt_ble_close,
 	};
 
 	rc = qt_ble_open(&io, context, devaddr, (dc_user_device_t *) userdata);
@@ -317,21 +309,15 @@ rfcomm_stream_open(dc_iostream_t **iostream, dc_context_t *context, const char*
 	qt_serial_t *io = NULL;
 
 	static const dc_custom_cbs_t callbacks = {
-		qt_serial_set_timeout, /* set_timeout */
-		NULL, /* set_break */
-		NULL, /* set_dtr */
-		NULL, /* set_rts */
-		NULL, /* get_lines */
-		qt_serial_get_available, /* get_received */
-		NULL, /* configure */
-		qt_serial_poll, /* poll */
-		qt_serial_read, /* read */
-		qt_serial_write, /* write */
-		qt_serial_ioctl, /* ioctl */
-		NULL, /* flush */
-		qt_serial_purge, /* purge */
-		qt_custom_sleep, /* sleep */
-		qt_serial_close, /* close */
+		.set_timeout	= qt_serial_set_timeout,
+		.get_available	= qt_serial_get_available,
+		.poll		= qt_serial_poll,
+		.read		= qt_serial_read,
+		.write		= qt_serial_write,
+		.ioctl		= qt_serial_ioctl,
+		.purge		= qt_serial_purge,
+		.sleep		= qt_custom_sleep,
+		.close		= qt_serial_close,
 	};
 
 	rc = qt_serial_open(&io, context, devaddr);

core/serial_ftdi.c

@@ -78,7 +78,7 @@ typedef struct ftdi_serial_t {
 	unsigned int parity;
 } ftdi_serial_t;
 
-static dc_status_t serial_ftdi_get_received (void *io, size_t *value)
+static dc_status_t serial_ftdi_get_available (void *io, size_t *value)
 {
 	ftdi_serial_t *device = io;
 
@@ -471,7 +471,7 @@ static dc_status_t serial_ftdi_purge (void *io, dc_direction_t queue)
 		return DC_STATUS_INVALIDARGS;
 
 	size_t input;
-	serial_ftdi_get_received (io, &input);
+	serial_ftdi_get_available (io, &input);
 	INFO (device->context, "Flush: queue=%u, input=%lu, output=%i", queue, input,
 	      serial_ftdi_get_transmitted (device));
 
@@ -557,20 +557,17 @@ dc_status_t ftdi_open(dc_iostream_t **iostream, dc_context_t *context)
 	void *io = NULL;
 
 	static const dc_custom_cbs_t callbacks = {
-		serial_ftdi_set_timeout, /* set_timeout */
-		NULL, /* set_latency */
-		serial_ftdi_set_break, /* set_break */
-		serial_ftdi_set_dtr, /* set_dtr */
-		serial_ftdi_set_rts, /* set_rts */
-		NULL, /* get_lines */
-		serial_ftdi_get_received, /* get_received */
-		serial_ftdi_configure, /* configure */
-		serial_ftdi_read, /* read */
-		serial_ftdi_write, /* write */
-		NULL, /* flush */
-		serial_ftdi_purge, /* purge */
-		serial_ftdi_sleep, /* sleep */
-		serial_ftdi_close, /* close */
+		.set_timeout	= serial_ftdi_set_timeout,
+		.set_break	= serial_ftdi_set_break,
+		.set_dtr	= serial_ftdi_set_dtr,
+		.set_rts	= serial_ftdi_set_rts,
+		.get_available	= serial_ftdi_get_available,
+		.configure	= serial_ftdi_configure,
+		.read		= serial_ftdi_read,
+		.write		= serial_ftdi_write,
+		.purge		= serial_ftdi_purge,
+		.sleep		= serial_ftdi_sleep,
+		.close		= serial_ftdi_close,
 	};
 
 	INFO(device->contxt, "%s", "in ftdi_open");