memcpy()-like move to odd bit

[Doug Gwyn]

In article <1990Nov12.235038.16331 at nntp-server.caltech.edu> manning at nntp-server.caltech.edu (Evan Marshall Manning) writes:
>The title about says it.  I need to move data from point A to
>point B, where there may be a bit offset as well as a byte offset.
>Is there any reasonably portable and/or reasonably fast way to do
>this?

This is known as a "bit blit" (special case of "rasterop"), and
algorithms are described in the computer graphics literature.
For example, there was an article in "Software -- Practice and
Experience" by Locanthi and Pike on the method used in the Blit
terminal.