Vicent Marti:
The POSIX standard doesn't currently define a `nothll`/`htonll` function pair to perform network-to-host and host-to-network swaps of 64-bit data. These 64-bit swaps are necessary for the on-disk storage of EWAH bitmaps if they are not in native byte order.
endian(3) claims that glibc 2.9+ define be64toh() and htobe64() which should do what you are looking for. The manual page does mention them being named differently across OSes, though, so you may need to be careful with that.
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