/*******************************************************************/

/*  slibtool: a skinny libtool implementation, written in C        */

/*  Copyright (C) 2015--2023  SysDeer Technologies, LLC            */

/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */

/*******************************************************************/

#include <stdint.h>

#include <stdbool.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/mman.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <slibtool/slibtool.h>

#include "slibtool_driver_impl.h"

#include "slibtool_errinfo_impl.h"

int slbt_map_input(

	const struct slbt_driver_ctx *	dctx,

	int				fd,

	const char *			path,

	int				prot,

	struct slbt_input *		map)

{

	int		ret;

	struct stat	st;

	bool		fnew;

	int		fdcwd;

	fdcwd = slbt_driver_fdcwd(dctx);

	if ((fnew = (fd < 0)))

		fd  = openat(fdcwd,path,O_RDONLY | O_CLOEXEC);

	if (fd < 0)

		return SLBT_SYSTEM_ERROR(dctx,path);

	if ((ret = fstat(fd,&st) < 0) && fnew)

		close(fd);

	else if ((st.st_size == 0) && fnew)

		close(fd);

	if (ret < 0)

		return SLBT_SYSTEM_ERROR(dctx,path);

	if (st.st_size == 0) {

		map->size = 0;

		map->addr = 0;

	} else {

		map->size = st.st_size;

		map->addr = mmap(0,map->size,prot,MAP_PRIVATE,fd,0);

	}

	if (fnew)

		close(fd);

	return (map->addr == MAP_FAILED)

		? SLBT_SYSTEM_ERROR(dctx,path)

		: 0;

}

int slbt_unmap_input(struct slbt_input * map)

{

	return map->size ? munmap(map->addr,map->size) : 0;

}