Re: [libvirt] [PATCH 1/3] util: Add a helper to check if all bits of a bitmap are clear

--- src/libvirt_private.syms | 1 + src/util/virbitmap.c | 30 ++++++++++++++++++++++++++++++ src/util/virbitmap.h | 3 +++ 3 files changed, 34 insertions(+)

+bool virBitmapIsAllClear(virBitmapPtr bitmap) +{ + int i; + int unusedBits; + size_t sz; + + unusedBits = bitmap->map_len * VIR_BITMAP_BITS_PER_UNIT - bitmap->max_bit; + + sz = bitmap->map_len; + if (unusedBits > 0) + sz--; + + for (i = 0; i < sz; i++) + if (bitmap->map[i] != 0) + return false; + + if (unusedBits > 0) { + if ((bitmap->map[sz] & ((1UL << (VIR_BITMAP_BITS_PER_UNIT - unusedBits)) - 1))) + return false;