/* radare - LGPL - Copyright 2009 pancake<nopcode.org> */

#include <r_io.h>

R_API int r_io_desc_init(struct r_io_t *io)
{
	INIT_LIST_HEAD(&io->desc);
	return R_TRUE;
}

R_API int r_io_desc_add(struct r_io_t *io, int fd, const char *file, int flags, struct r_io_handle_t *handle)
{
	struct r_io_desc_t *desc = MALLOC_STRUCT(struct r_io_desc_t);
	if (desc == NULL)
		return R_FALSE;
	strncpy(desc->name, file, sizeof(desc->name));
	desc->flags = flags;
	desc->fd = fd;
	desc->handle = handle;
	list_add_tail(&(desc->list), &(io->desc));
	return R_TRUE;
}

R_API int r_io_desc_del(struct r_io_t *io, int fd)
{
	int ret = R_FALSE;
	struct list_head *pos;
	list_for_each_prev(pos, &io->desc) {
		struct r_io_desc_t *d = list_entry(pos, struct r_io_desc_t, list);
		if (d->fd == fd) {
			list_del((&d->list));
			ret = R_TRUE;
			break;
		}
	}
	return ret;
}

R_API struct r_io_desc_t *r_io_desc_get(struct r_io_t *io, int fd)
{
	struct list_head *pos;
	list_for_each_prev(pos, &io->desc) {
		struct r_io_desc_t *d = list_entry(pos, struct r_io_desc_t, list);
		if (d->fd == fd)
			return d;
	}
	return NULL;
}

R_API int r_io_desc_generate(struct r_io_t *io)
{
	int fd;
	do fd = 0xf000 + rand()%0xfff;
	while (r_io_desc_get(io, fd));
	return fd;
}