diff options
| author | Keith Packard <keithp@keithp.com> | 2011-02-25 21:10:21 -0800 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-02-25 21:25:25 -0800 |
| commit | 678f5396c91b3d0c7572ed579b0a4fb62b2b4655 (patch) | |
| tree | 5edf43acc1d5109677f722bda6d412f5e4c46ce0 /dix/devices.c | |
| parent | dc8f52e77f51b6fa8908d9611c3f7e3cfbbaf2d1 (diff) | |
input: Ensure Valuator axes are aligned as needed
Let the compiler figure out the correct alignment for the axes data
for a valuator by using a union to force double alignment of the
initial ValuatorClassRec structure in the allocation.
Signed-off-by: Keith Packard <keithp@keithp.com>
Tested-by: Julien Cristau <jcristau@debian.org>
Reviewed-by: Julien Cristau <jcristau@debian.org>
Diffstat (limited to 'dix/devices.c')
| -rw-r--r-- | dix/devices.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/dix/devices.c b/dix/devices.c index 6c0dc42a4..89294aacb 100644 --- a/dix/devices.c +++ b/dix/devices.c @@ -1225,6 +1225,7 @@ InitValuatorClassDeviceStruct(DeviceIntPtr dev, int numAxes, Atom *labels, { int i; ValuatorClassPtr valc; + union align_u { ValuatorClassRec valc; double d; } *align; if (!dev) return FALSE; @@ -1237,12 +1238,13 @@ InitValuatorClassDeviceStruct(DeviceIntPtr dev, int numAxes, Atom *labels, numAxes = MAX_VALUATORS; } - valc = (ValuatorClassPtr)calloc(1, sizeof(ValuatorClassRec) + - numAxes * sizeof(AxisInfo) + - numAxes * sizeof(double)); - if (!valc) + align = (union align_u *) calloc(1, sizeof(union align_u) + + numAxes * sizeof(double) + + numAxes * sizeof(AxisInfo)); + if (!align) return FALSE; + valc = &align->valc; valc->sourceid = dev->id; valc->motion = NULL; valc->first_motion = 0; @@ -1251,8 +1253,8 @@ InitValuatorClassDeviceStruct(DeviceIntPtr dev, int numAxes, Atom *labels, valc->numMotionEvents = numMotionEvents; valc->motionHintWindow = NullWindow; valc->numAxes = numAxes; - valc->axes = (AxisInfoPtr)(valc + 1); - valc->axisVal = (double *)(valc->axes + numAxes); + valc->axisVal = (double *)(align + 1); + valc->axes = (AxisInfoPtr)(valc->axisVal + numAxes); if (mode & OutOfProximity) InitProximityClassDeviceStruct(dev); |