On Fri, 4 Jan 2002, David Laight wrote:

: > memcpy (&data, buf + offset, sizeof (data));
: >
: > Note that gcc treats the use of memcpy and structure copies the same
: > way.
:
: I would have thought that memcpy( &data, ptr, sizeof data ) would be safe.
: Since there is an (implied) cast to void * in the function call.  If gcc's
: inlining of memcpy assumes otherwise it might be deemed broken.

No, because "ptr" in this context is a "struct ifreq *", not "void *".
The "implied" cast to "void *" is allowed to keep the compiler's notion of
alignment.  (This is in C99, but I believe this goes back further.)

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