alloca - memory allocator
void *alloca( size_t size));
The alloca function allocates size bytes of space in the
stack frame of the caller. This temporary space is automat-
ically freed on return.
The alloca function returns a pointer to the beginning of
the allocated space. If the allocation failed, a NULL
pointer is returned.
There is evidence that the alloca function appeared in 32v,
pwb, pwb.2, 3bsd, and 4bsd. There is a man page for it in
BSD 4.3. Linux uses the GNU version.
The alloca function is machine dependent.
brk(2), pagesize(2), calloc(3),