alloca.h, this function allocates
local storage in a function. It returns a pointer to
of memory. The default implementation returns an eight-byte aligned
block of memory on the stack.
Memory returned from
alloca() must never
be passed to
free(). Instead, the memory is de-allocated
automatically when the function that called
alloca() must not be called through a
function pointer. You must take care when using
the same function, because memory allocated by
de-allocated by the call to
This function is a common nonstandard extension to many C libraries.