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Ignore slot sync for slots > 256

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Clang doesn't support variable length arrays inside a struct so we could
either make our life complicated or just assume no-one is using more than 256
slots and hard-code that. Let's go for the easy solution until someone
notices.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2020-02-19 13:18:48 +10:00
parent e9ecb5cabc
commit 6ccee710bd
1 changed files with 5 additions and 6 deletions
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11
libevdev/libevdev.c
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@ -677,16 +677,15 @@ static int
sync_mt_state(struct libevdev *dev,
struct slot_change_state changes_out[dev->num_slots])
{
#define MAX_SLOTS 256
int rc;
struct slot_change_state changes[dev->num_slots];
memset(changes, 0, sizeof(changes));
struct slot_change_state changes[MAX_SLOTS] = {0};
for (int axis = ABS_MT_MIN; axis <= ABS_MT_MAX; axis++) {
/* EVIOCGMTSLOTS required format */
struct mt_sync_state {
uint32_t code;
int32_t val[dev->num_slots];
int32_t val[MAX_SLOTS];
} mt_state;
if (axis == ABS_MT_SLOT ||
@ -698,7 +697,7 @@ sync_mt_state(struct libevdev *dev,
if (rc < 0)
goto out;
for (int slot = 0; slot < dev->num_slots; slot++) {
for (int slot = 0; slot < min(MAX_SLOTS, dev->num_slots); slot++) {
int val_before = *slot_value(dev, slot, axis),
val_after = mt_state.val[slot];
@ -729,7 +728,7 @@ sync_mt_state(struct libevdev *dev,
}
}
memcpy(changes_out, changes, sizeof(changes));
memcpy(changes_out, changes, sizeof(*changes) * dev->num_slots);
out:
return rc;
}