void *
alloca(size_t size)
)
function
allocates
size
bytes of space in the stack frame of the caller.
This temporary space is automatically freed on
return.
)
function returns a pointer to the beginning of the allocated space.
If the allocation failed, a
NULL
pointer is returned.
)
function
is machine dependent; its use is discouraged.
The
alloca()
function is slightly unsafe because it cannot ensure that the pointer
returned points to a valid and usable block of memory.
The allocation made may exceed the bounds of the stack, or even go
further into other objects in memory, and
alloca()
cannot determine such an error.
Avoid
alloca()
with large unbounded allocations.