/******************************************************/
/*  tpax: a topological pax implementation            */
/*  Copyright (C) 2020  Z. Gilboa                     */
/*  Released under GPLv2 and GPLv3; see COPYING.TPAX. */
/******************************************************/

#ifndef TPAX_DRIVER_IMPL_H
#define TPAX_DRIVER_IMPL_H

#include <stdint.h>
#include <stdio.h>
#include <sys/types.h>

#include <tpax/tpax.h>
#include "tpax_dprintf_impl.h"
#include "argv/argv.h"

#define TPAX_OPTV_ELEMENTS 64

extern const struct argv_option tpax_default_options[];

enum app_tags {
	TAG_HELP,
	TAG_VERSION,
	TAG_LIST,
	TAG_READ,
	TAG_WRITE,
	TAG_COPY,
	TAG_FORMAT,
};

struct tpax_driver_ctx_impl {
	struct tpax_common_ctx        cctx;
	struct tpax_driver_ctx        ctx;
	struct tpax_fd_ctx            fdctx;
	const struct tpax_unit_ctx *  euctx;
	const char *                  eunit;
	struct tpax_error_info **     errinfp;
	struct tpax_error_info **     erricap;
	struct tpax_error_info *      erriptr[64];
	struct tpax_error_info        erribuf[64];
};

struct tpax_unit_ctx_impl {
	const char *		path;
	struct tpax_unit_ctx	uctx;
};


static inline struct tpax_driver_ctx_impl * tpax_get_driver_ictx(
	const struct tpax_driver_ctx * dctx)
{
        uintptr_t addr;

        if (dctx) {
                addr = (uintptr_t)dctx - offsetof(struct tpax_driver_ctx_impl,ctx);
                return (struct tpax_driver_ctx_impl *)addr;
        }

        return 0;
}

static inline void tpax_driver_set_ectx(
	const struct tpax_driver_ctx * dctx,
	const struct tpax_unit_ctx *   uctx,
	const char *                 unit)
{
	struct tpax_driver_ctx_impl *  ictx;

	ictx        = tpax_get_driver_ictx(dctx);
	ictx->euctx = uctx;
	ictx->eunit = unit;
}

static inline int tpax_driver_fdin(const struct tpax_driver_ctx * dctx)
{
	struct tpax_fd_ctx fdctx;
	tpax_get_driver_fdctx(dctx,&fdctx);
	return fdctx.fdin;
}

static inline int tpax_driver_fdout(const struct tpax_driver_ctx * dctx)
{
	struct tpax_fd_ctx fdctx;
	tpax_get_driver_fdctx(dctx,&fdctx);
	return fdctx.fdout;
}

static inline int tpax_driver_fderr(const struct tpax_driver_ctx * dctx)
{
	struct tpax_fd_ctx fdctx;
	tpax_get_driver_fdctx(dctx,&fdctx);
	return fdctx.fderr;
}

static inline int tpax_driver_fdlog(const struct tpax_driver_ctx * dctx)
{
	struct tpax_fd_ctx fdctx;
	tpax_get_driver_fdctx(dctx,&fdctx);
	return fdctx.fdlog;
}

static inline int tpax_driver_fdcwd(const struct tpax_driver_ctx * dctx)
{
	struct tpax_fd_ctx fdctx;
	tpax_get_driver_fdctx(dctx,&fdctx);
	return fdctx.fdcwd;
}

static inline int tpax_driver_fddst(const struct tpax_driver_ctx * dctx)
{
	struct tpax_fd_ctx fdctx;
	tpax_get_driver_fdctx(dctx,&fdctx);
	return fdctx.fddst;
}

#endif