mango/include/kernel/iovec.h

#ifndef KERNEL_IOVEC_H_
#define KERNEL_IOVEC_H_

#include <mango/types.h>
#include <stddef.h>

struct iovec_iterator {
	/* if this is set, we are iterating over a list of iovecs stored in
	 * userspace, and must go through this region to retrieve the data. */
	struct vm_region *it_region;
	const kern_iovec_t *it_vecs;
	size_t it_nr_vecs;
	size_t it_vec_ptr;

	virt_addr_t it_base;
	size_t it_len;
};

extern void iovec_iterator_begin(
	struct iovec_iterator *it,
	const kern_iovec_t *vecs,
	size_t nr_vecs);
extern void iovec_iterator_begin_user(
	struct iovec_iterator *it,
	struct vm_region *address_space,
	const kern_iovec_t *vecs,
	size_t nr_vecs);

extern void iovec_iterator_seek(struct iovec_iterator *it, size_t nr_bytes);

#endif