/usr/include/newlib/tar.h is in libnewlib-dev 2.4.0.20160527-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | /*
 * tar.h
 */
#ifndef _TAR_H
#define _TAR_H
#include <sys/features.h>
/* General definitions */
#define TMAGIC 		"ustar" /* ustar plus null byte. */
#define TMAGLEN 	6 	/* Length of the above. */
#define TVERSION 	"00"	/* 00 without a null byte. */
#define TVERSLEN	2	/* Length of the above. */
/* Typeflag field definitions */
#define REGTYPE 	'0'	/* Regular file. */
#define AREGTYPE	'\0'	/* Regular file. */
#define LNKTYPE		'1'	/* Link. */
#define SYMTYPE		'2'	/* Symbolic link. */
#define CHRTYPE		'3'	/* Character special. */
#define BLKTYPE		'4'	/* Block special. */
#define DIRTYPE		'5'	/* Directory. */
#define FIFOTYPE	'6'	/* FIFO special. */
#define CONTTYPE	'7'	/* Reserved. */
/* Mode field bit definitions (octal) */
#define	TSUID		04000	/* Set UID on execution. */
#define	TSGID		02000	/* Set GID on execution. */
#if __XSI_VISIBLE || __POSIX_VISIBLE < 200112
#define	TSVTX		01000	/* On directories, restricted deletion flag. */
#endif
#define	TUREAD		00400	/* Read by owner. */
#define	TUWRITE		00200	/* Write by owner. */
#define	TUEXEC		00100	/* Execute/search by owner. */
#define	TGREAD		00040	/* Read by group. */
#define	TGWRITE		00020	/* Write by group. */
#define	TGEXEC		00010	/* Execute/search by group. */
#define	TOREAD		00004	/* Read by other. */
#define	TOWRITE		00002	/* Write by other. */
#define	TOEXEC		00001	/* Execute/search by other. */
#endif
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