#include <stdint.h>

#include <stddef.h>

#include <stdlib.h>

#include <string.h>

#include <sys/mman.h>

#include <sofort/sofort.h>

#include "sofort_driver_impl.h"

#include "sofort_errinfo_impl.h"

static int sfrt_free_unit_ctx_impl(struct sfrt_unit_ctx_impl * ctx, int ret)

{

	if (ctx) {

		sfrt_unmap_input(&ctx->map);

		free(ctx);

	}

	return ret;

}

int sfrt_get_unit_ctx(

	const struct sfrt_driver_ctx *	dctx,

	const char *			path,

	struct sfrt_unit_ctx **		pctx)

{

	struct sfrt_unit_ctx_impl *	ctx;

	if (!dctx)

		return SFRT_CUSTOM_ERROR(

			dctx,SFRT_ERR_NULL_CONTEXT);

	else if (!(ctx = calloc(1,sizeof(*ctx))))

		return SFRT_BUFFER_ERROR(dctx);

	sfrt_driver_set_ectx(

		dctx,0,path);

	if (sfrt_map_input(dctx,-1,path,PROT_READ,&ctx->map))

		return sfrt_free_unit_ctx_impl(ctx,

			SFRT_NESTED_ERROR(dctx));

	ctx->path	= path;

	ctx->uctx.path	= &ctx->path;

	ctx->uctx.map	= &ctx->map;

	*pctx = &ctx->uctx;

	return 0;

}

void sfrt_free_unit_ctx(struct sfrt_unit_ctx * ctx)

{

	struct sfrt_unit_ctx_impl *	ictx;

	uintptr_t			addr;

	if (ctx) {

		addr = (uintptr_t)ctx - offsetof(struct sfrt_unit_ctx_impl,uctx);

		ictx = (struct sfrt_unit_ctx_impl *)addr;

		sfrt_free_unit_ctx_impl(ictx,0);

	}

}