/**
* virBitmapClearBit:
* @bitmap: Pointer to bitmap
* @b: bit position to clear
*
* Clear bit position @b in @bitmap
*
* Returns 0 on if bit is successfully clear, -1 on error.
*/
int virBitmapClearBit(virBitmapPtr bitmap, size_t b)
{
if (bitmap->max_bit <= b)
return -1;
bitmap->map[VIR_BITMAP_UNIT_OFFSET(b)] &= ~VIR_BITMAP_BIT(b);
return 0;
}
/**
* virBitmapSetBitExpand:
* @bitmap: Pointer to bitmap
* @b: bit position to set
*
* Set bit position @b in @bitmap. Expands the bitmap as necessary so that @b is
* included in the map.
*
* Returns 0 on if bit is successfully set, -1 on error.
*/
int virBitmapSetBitExpand(virBitmapPtr bitmap, size_t b)
{
if (bitmap->max_bit <= b && virBitmapExpand(bitmap, b) < 0)
return -1;
bitmap->map[VIR_BITMAP_UNIT_OFFSET(b)] |= VIR_BITMAP_BIT(b);
return 0;
}
/**
* virBitmapSetBit:
* @bitmap: Pointer to bitmap
* @b: bit position to set
*
* Set bit position @b in @bitmap
*
* Returns 0 on if bit is successfully set, -1 on error.
*/
int virBitmapSetBit(virBitmapPtr bitmap, size_t b)
{
if (bitmap->size <= b)
return -1;
bitmap->map[VIR_BITMAP_UNIT_OFFSET(b)] |= (1 << VIR_BITMAP_BIT_OFFSET(b));
return 0;
}
/**
* virBitmapClearBitExpand:
* @bitmap: Pointer to bitmap
* @b: bit position to set
*
* Clear bit position @b in @bitmap. Expands the bitmap as necessary so that
* @b is included in the map.
*
* Returns 0 on if bit is successfully cleared, -1 on error.
*/
int virBitmapClearBitExpand(virBitmapPtr bitmap, size_t b)
{
if (bitmap->max_bit <= b) {
if (virBitmapExpand(bitmap, b) < 0)
return -1;
} else {
bitmap->map[VIR_BITMAP_UNIT_OFFSET(b)] &= ~VIR_BITMAP_BIT(b);
}
return 0;
}
/**
* virBitmapGetBit:
* @bitmap: Pointer to bitmap
* @b: bit position to get
* @result: bool pointer to receive bit setting
*
* Get setting of bit position @b in @bitmap and store in @result
*
* On success, @result will contain the setting of @b and 0 is
* returned. On failure, -1 is returned and @result is unchanged.
*/
int virBitmapGetBit(virBitmapPtr bitmap, size_t b, bool *result)
{
uint32_t bit;
if (bitmap->size <= b)
return -1;
bit = bitmap->map[VIR_BITMAP_UNIT_OFFSET(b)] &
(1 << VIR_BITMAP_BIT_OFFSET(b));
*result = bit != 0;
return 0;
}
/* Helper function. caller must ensure b < bitmap->max_bit */
static bool virBitmapIsSet(virBitmapPtr bitmap, size_t b)
{
return !!(bitmap->map[VIR_BITMAP_UNIT_OFFSET(b)] & VIR_BITMAP_BIT(b));
}
