/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Copyright (c) 2026
 *	Project Tick. All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Keith Muller of the University of California, San Diego and Lance
 * Visser of Convex Computer Corporation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Linux/musl build glue for the standalone port.
 * Keep the main dd data path close to FreeBSD, but avoid relying on
 * FreeBSD-only typedefs and helper macros.
 */

#include <limits.h>
#include <signal.h>
#include <stdint.h>
#include <sys/types.h>
#include <time.h>

#ifndef __unused
#define	__unused	__attribute__((__unused__))
#endif

#ifndef __dead2
#define	__dead2		__attribute__((__noreturn__))
#endif

#ifndef nitems
#define	nitems(array)	(sizeof(array) / sizeof((array)[0]))
#endif

#ifndef MIN
#define	MIN(a, b)	((a) < (b) ? (a) : (b))
#endif

#ifndef MAX
#define	MAX(a, b)	((a) > (b) ? (a) : (b))
#endif

#ifndef OFF_MAX
#define	OFF_MAX		((off_t)INT64_MAX)
#endif

#ifndef DEFFILEMODE
#define	DEFFILEMODE	0666
#endif

typedef unsigned char u_char;
typedef unsigned int u_int;

/* Input/output stream state. */
typedef struct {
	u_char		*db;		/* buffer address */
	u_char		*dbp;		/* current buffer I/O address */
	ssize_t		dbcnt;		/* current buffer byte count */
	ssize_t		dbrcnt;		/* last read byte count */
	ssize_t		dbsz;		/* block size */

#define	ISCHR		0x01		/* character device (warn on short) */
#define	ISPIPE		0x02		/* pipe-like (see position.c) */
#define	ISTAPE		0x04		/* tape */
#define	ISSEEK		0x08		/* valid to seek on */
#define	NOREAD		0x10		/* not readable */
#define	ISTRUNC		0x20		/* valid to ftruncate() */
	u_int		flags;

	const char	*name;		/* name */
	int		fd;		/* file descriptor */
	off_t		offset;		/* # of blocks to skip */
	off_t		seek_offset;	/* offset of last seek past output hole */
} IO;

typedef struct {
	uintmax_t	in_full;	/* # of full input blocks */
	uintmax_t	in_part;	/* # of partial input blocks */
	uintmax_t	out_full;	/* # of full output blocks */
	uintmax_t	out_part;	/* # of partial output blocks */
	uintmax_t	trunc;		/* # of truncated records */
	uintmax_t	swab;		/* # of odd-length swab blocks */
	uintmax_t	bytes;		/* # of bytes written */
	struct timespec	start;		/* start time of dd */
} STAT;

/* Flags (in ddflags). */
#define	C_ASCII		0x0000000000000001ULL
#define	C_BLOCK		0x0000000000000002ULL
#define	C_BS		0x0000000000000004ULL
#define	C_CBS		0x0000000000000008ULL
#define	C_COUNT		0x0000000000000010ULL
#define	C_EBCDIC	0x0000000000000020ULL
#define	C_FILES		0x0000000000000040ULL
#define	C_IBS		0x0000000000000080ULL
#define	C_IF		0x0000000000000100ULL
#define	C_LCASE		0x0000000000000200ULL
#define	C_NOERROR	0x0000000000000400ULL
#define	C_NOTRUNC	0x0000000000000800ULL
#define	C_OBS		0x0000000000001000ULL
#define	C_OF		0x0000000000002000ULL
#define	C_OSYNC		0x0000000000004000ULL
#define	C_PAREVEN	0x0000000000008000ULL
#define	C_PARNONE	0x0000000000010000ULL
#define	C_PARODD	0x0000000000020000ULL
#define	C_PARSET	0x0000000000040000ULL
#define	C_SEEK		0x0000000000080000ULL
#define	C_SKIP		0x0000000000100000ULL
#define	C_SPARSE	0x0000000000200000ULL
#define	C_SWAB		0x0000000000400000ULL
#define	C_SYNC		0x0000000000800000ULL
#define	C_UCASE		0x0000000001000000ULL
#define	C_UNBLOCK	0x0000000002000000ULL
#define	C_FILL		0x0000000004000000ULL
#define	C_STATUS	0x0000000008000000ULL
#define	C_NOXFER	0x0000000010000000ULL
#define	C_NOINFO	0x0000000020000000ULL
#define	C_PROGRESS	0x0000000040000000ULL
#define	C_FSYNC		0x0000000080000000ULL
#define	C_FDATASYNC	0x0000000100000000ULL
#define	C_OFSYNC	0x0000000200000000ULL
#define	C_IFULLBLOCK	0x0000000400000000ULL
#define	C_IDIRECT	0x0000000800000000ULL
#define	C_ODIRECT	0x0000001000000000ULL

#define	C_PARITY	(C_PAREVEN | C_PARODD | C_PARNONE | C_PARSET)

#define	BISZERO(p, s)	((s) > 0 && *((const char *)p) == 0 && !memcmp( \
			    (const void *)(p), (const void *) \
			    ((const char *)p + 1), (s) - 1))
