text: /* vi: set sw=4 ts=4: */
  /*
   * Mini tar implementation for busybox
   *
   * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg
   *  by Glenn McGrath
   *
   * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
   * ground up.  It still has remnants of the old code lying about, but it is
   * very different now (i.e., cleaner, less global variables, etc.)
   *
   * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   *
   * Based in part in the tar implementation in sash
   *  Copyright (c) 1999 by David I. Bell
   *  Permission is granted to use, distribute, or modify this source,
   *  provided that this copyright notice remains intact.
   *  Permission to distribute sash derived code under GPL has been granted.
   *
   * Based in part on the tar implementation from busybox-0.28
   *  Copyright (C) 1995 Bruce Perens
   *
   * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   */
  /* TODO: security with -C DESTDIR option can be enhanced.
   * Consider tar file created via:
   * $ tar cvf bug.tar anything.txt
   * $ ln -s /tmp symlink
   * $ tar --append -f bug.tar symlink
   * $ rm symlink
   * $ mkdir symlink
   * $ tar --append -f bug.tar symlink/evil.py
   *
   * This will result in an archive which contains:
   * $ tar --list -f bug.tar
   * anything.txt
   * symlink
   * symlink/evil.py
   *
   * Untarring it puts evil.py in '/tmp' even if the -C DESTDIR is given.
   * This doesn't feel right, and IIRC GNU tar doesn't do that.
   */
  
  //config:config TAR
  //config:	bool "tar"
  //config:	default y
  //config:	help
  //config:	  tar is an archiving program. It's commonly used with gzip to
  //config:	  create compressed archives. It's probably the most widely used
  //config:	  UNIX archive program.
  //config:
  //config:config FEATURE_TAR_CREATE
  //config:	bool "Enable archive creation"
  //config:	default y
  //config:	depends on TAR
  //config:	help
  //config:	  If you enable this option you'll be able to create
  //config:	  tar archives using the `-c' option.
  //config:
  //config:config FEATURE_TAR_AUTODETECT
  //config:	bool "Autodetect compressed tarballs"
  //config:	default y
  //config:	depends on TAR && (FEATURE_SEAMLESS_Z || FEATURE_SEAMLESS_GZ || FEATURE_SEAMLESS_BZ2 || FEATURE_SEAMLESS_LZMA || FEATURE_SEAMLESS_XZ)
  //config:	help
  //config:	  With this option tar can automatically detect compressed
  //config:	  tarballs. Currently it works only on files (not pipes etc).
  //config:
  //config:config FEATURE_TAR_FROM
  //config:	bool "Enable -X (exclude from) and -T (include from) options)"
  //config:	default y
  //config:	depends on TAR
  //config:	help
  //config:	  If you enable this option you'll be able to specify
  //config:	  a list of files to include or exclude from an archive.
  //config:
  //config:config FEATURE_TAR_OLDGNU_COMPATIBILITY
  //config:	bool "Support for old tar header format"
  //config:	default y
  //config:	depends on TAR || DPKG
  //config:	help
  //config:	  This option is required to unpack archives created in
  //config:	  the old GNU format; help to kill this old format by
  //config:	  repacking your ancient archives with the new format.
  //config:
  //config:config FEATURE_TAR_OLDSUN_COMPATIBILITY
  //config:	bool "Enable untarring of tarballs with checksums produced by buggy Sun tar"
  //config:	default y
  //config:	depends on TAR || DPKG
  //config:	help
  //config:	  This option is required to unpack archives created by some old
  //config:	  version of Sun's tar (it was calculating checksum using signed
  //config:	  arithmetic). It is said to be fixed in newer Sun tar, but "old"
  //config:	  tarballs still exist.
  //config:
  //config:config FEATURE_TAR_GNU_EXTENSIONS
  //config:	bool "Support for GNU tar extensions (long filenames)"
  //config:	default y
  //config:	depends on TAR || DPKG
  //config:	help
  //config:	  With this option busybox supports GNU long filenames and
  //config:	  linknames.
  //config:
  //config:config FEATURE_TAR_LONG_OPTIONS
  //config:	bool "Enable long options"
  //config:	default y
  //config:	depends on TAR && LONG_OPTS
  //config:	help
  //config:	  Enable use of long options, increases size by about 400 Bytes
  //config:
  //config:config FEATURE_TAR_TO_COMMAND
  //config:	bool "Support for writing to an external program"
  //config:	default y
  //config:	depends on TAR && FEATURE_TAR_LONG_OPTIONS
  //config:	help
  //config:	  If you enable this option you'll be able to instruct tar to send
  //config:	  the contents of each extracted file to the standard input of an
  //config:	  external program.
  //config:
  //config:config FEATURE_TAR_UNAME_GNAME
  //config:	bool "Enable use of user and group names"
  //config:	default y
  //config:	depends on TAR
  //config:	help
  //config:	  Enables use of user and group names in tar. This affects contents
  //config:	  listings (-t) and preserving permissions when unpacking (-p).
  //config:	  +200 bytes.
  //config:
  //config:config FEATURE_TAR_NOPRESERVE_TIME
  //config:	bool "Enable -m (do not preserve time) option"
  //config:	default y
  //config:	depends on TAR
  //config:	help
  //config:	  With this option busybox supports GNU tar -m
  //config:	  (do not preserve time) option.
  //config:
  //config:config FEATURE_TAR_SELINUX
  //config:	bool "Support for extracting SELinux labels"
  //config:	default n
  //config:	depends on TAR && SELINUX
  //config:	help
  //config:	  With this option busybox supports restoring SELinux labels
  //config:	  when extracting files from tar archives.
  
  //applet:IF_TAR(APPLET(tar, BB_DIR_BIN, BB_SUID_DROP))
  //kbuild:lib-$(CONFIG_TAR) += tar.o
  
  #include <fnmatch.h>
  #include "libbb.h"
  #include "bb_archive.h"
  /* FIXME: Stop using this non-standard feature */
  #ifndef FNM_LEADING_DIR
  # define FNM_LEADING_DIR 0
  #endif
  
  
  //#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
  #define DBG(...) ((void)0)
  
  
  #define block_buf bb_common_bufsiz1
  
  
  #if !ENABLE_FEATURE_SEAMLESS_GZ && !ENABLE_FEATURE_SEAMLESS_BZ2
  /* Do not pass gzip flag to writeTarFile() */
  #define writeTarFile(tar_fd, verboseFlag, optFlags, recurseFlags, include, exclude, gzip) \
  	writeTarFile(tar_fd, verboseFlag, optFlags, recurseFlags, include, exclude)
  #endif
  
  
  #if ENABLE_FEATURE_TAR_CREATE
  
  /*
  ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
  ** the only functions that deal with the HardLinkInfo structure.
  ** Even these functions use the xxxHardLinkInfo() functions.
  */
  typedef struct HardLinkInfo {
  	struct HardLinkInfo *next; /* Next entry in list */
  	dev_t dev;                 /* Device number */
  	ino_t ino;                 /* Inode number */
  //	short linkCount;           /* (Hard) Link Count */
  	char name[1];              /* Start of filename (must be last) */
  } HardLinkInfo;
  
  /* Some info to be carried along when creating a new tarball */
  typedef struct TarBallInfo {
  	int tarFd;                      /* Open-for-write file descriptor
  	                                 * for the tarball */
  	int verboseFlag;                /* Whether to print extra stuff or not */
  	unsigned optFlags;              /* all command line flags */
  
  	const llist_t *excludeList;     /* List of files to not include */
  	HardLinkInfo *hlInfoHead;       /* Hard Link Tracking Information */
  	HardLinkInfo *hlInfo;           /* Hard Link Info for the current file */
  //TODO: save only st_dev + st_ino
  	struct stat tarFileStatBuf;     /* Stat info for the tarball, letting
  	                                 * us know the inode and device that the
  	                                 * tarball lives, so we can avoid trying
  	                                 * to include the tarball into itself */
  } TarBallInfo;
  
  /* A nice enum with all the possible tar file content types */
  enum {
  	REGTYPE = '0',		/* regular file */
  	REGTYPE0 = '\0',	/* regular file (ancient bug compat) */
  	LNKTYPE = '1',		/* hard link */
  	SYMTYPE = '2',		/* symbolic link */
  	CHRTYPE = '3',		/* character special */
  	BLKTYPE = '4',		/* block special */
  	DIRTYPE = '5',		/* directory */
  	FIFOTYPE = '6',		/* FIFO special */
  	CONTTYPE = '7',		/* reserved */
  	GNULONGLINK = 'K',	/* GNU long (>100 chars) link name */
  	GNULONGNAME = 'L',	/* GNU long (>100 chars) file name */
  	EXTTYPE = 'x',		/* ext metadata for next file, store selinux_context */
  };
  
  /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
  static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
  					struct stat *statbuf,
  					const char *fileName)
  {
  	/* Note: hlInfoHeadPtr can never be NULL! */
  	HardLinkInfo *hlInfo;
  
  	hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
  	hlInfo->next = *hlInfoHeadPtr;
  	*hlInfoHeadPtr = hlInfo;
  	hlInfo->dev = statbuf->st_dev;
  	hlInfo->ino = statbuf->st_ino;
  //	hlInfo->linkCount = statbuf->st_nlink;
  	strcpy(hlInfo->name, fileName);
  }
  
  static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
  {
  	HardLinkInfo *hlInfo;
  	HardLinkInfo *hlInfoNext;
  
  	if (hlInfoHeadPtr) {
  		hlInfo = *hlInfoHeadPtr;
  		while (hlInfo) {
  			hlInfoNext = hlInfo->next;
  			free(hlInfo);
  			hlInfo = hlInfoNext;
  		}
  		*hlInfoHeadPtr = NULL;
  	}
  }
  
  /* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */
  static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
  {
  	while (hlInfo) {
  		if (statbuf->st_ino == hlInfo->ino
  		 && statbuf->st_dev == hlInfo->dev
  		) {
  			DBG("found hardlink:'%s'", hlInfo->name);
  			break;
  		}
  		hlInfo = hlInfo->next;
  	}
  	return hlInfo;
  }
  
  /* Put an octal string into the specified buffer.
   * The number is zero padded and possibly null terminated.
   * Stores low-order bits only if whole value does not fit. */
  static void putOctal(char *cp, int len, off_t value)
  {
  	char tempBuffer[sizeof(off_t)*3 + 1];
  	char *tempString = tempBuffer;
  	int width;
  
  	width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
  	tempString += (width - len);
  
  	/* If string has leading zeroes, we can drop one */
  	/* and field will have trailing '\0' */
  	/* (increases chances of compat with other tars) */
  	if (tempString[0] == '0')
  		tempString++;
  
  	/* Copy the string to the field */
  	memcpy(cp, tempString, len);
  }
  #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
  
  static void chksum_and_xwrite(int fd, struct tar_header_t* hp)
  {
  	/* POSIX says that checksum is done on unsigned bytes
  	 * (Sun and HP-UX gets it wrong... more details in
  	 * GNU tar source) */
  	const unsigned char *cp;
  	int chksum, size;
  
  	strcpy(hp->magic, "ustar  ");
  
  	/* Calculate and store the checksum (i.e., the sum of all of the bytes of
  	 * the header).  The checksum field must be filled with blanks for the
  	 * calculation.  The checksum field is formatted differently from the
  	 * other fields: it has 6 digits, a null, then a space -- rather than
  	 * digits, followed by a null like the other fields... */
  	memset(hp->chksum, ' ', sizeof(hp->chksum));
  	cp = (const unsigned char *) hp;
  	chksum = 0;
  	size = sizeof(*hp);
  	do { chksum += *cp++; } while (--size);
  	putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
  
  	/* Now write the header out to disk */
  	xwrite(fd, hp, sizeof(*hp));
  }
  
  #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
  static void writeLongname(int fd, int type, const char *name, int dir)
  {
  	static const struct {
  		char mode[8];             /* 100-107 */
  		char uid[8];              /* 108-115 */
  		char gid[8];              /* 116-123 */
  		char size[12];            /* 124-135 */
  		char mtime[12];           /* 136-147 */
  	} prefilled = {
  		"0000000",
  		"0000000",
  		"0000000",
  		"00000000000",
  		"00000000000",
  	};
  	struct tar_header_t header;
  	int size;
  
  	dir = !!dir; /* normalize: 0/1 */
  	size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
  	/* + dir: account for possible '/' */
  
  	memset(&header, 0, sizeof(header));
  	strcpy(header.name, "././@LongLink");
  	memcpy(header.mode, prefilled.mode, sizeof(prefilled));
  	PUT_OCTAL(header.size, size);
  	header.typeflag = type;
  	chksum_and_xwrite(fd, &header);
  
  	/* Write filename[/] and pad the block. */
  	/* dir=0: writes 'name<NUL>', pads */
  	/* dir=1: writes 'name', writes '/<NUL>', pads */
  	dir *= 2;
  	xwrite(fd, name, size - dir);
  	xwrite(fd, "/", dir);
  	size = (-size) & (TAR_BLOCK_SIZE-1);
  	memset(&header, 0, size);
  	xwrite(fd, &header, size);
  }
  #endif
  
  #if ENABLE_FEATURE_TAR_SELINUX
  # define SELINUX_CONTEXT_KEYWORD "RHT.security.selinux"
  /* Write 2 blocks : extended file header + selinux context */
  static int writeSeHeader(int fd, const char *con, struct tar_header_t *header)
  {
  	char block[TAR_BLOCK_SIZE];
  	struct tar_header_t hd;
  
  	int sz = sizeof(SELINUX_CONTEXT_KEYWORD) + 4 + strlen(con);
  	if (sz >= 100) sz++; /* another ascii digit for size */
  	if (sz > TAR_BLOCK_SIZE)
  		return FALSE;
  
  	memset(&block, 0, TAR_BLOCK_SIZE);
  	sprintf(block, "%d %s=%s\n", sz, SELINUX_CONTEXT_KEYWORD, con);
  
  	/* write duplicated file entry */
  	memcpy(&hd, header, sizeof(hd));
  	hd.typeflag = EXTTYPE;
  	PUT_OCTAL(hd.size, sz);
  	chksum_and_xwrite(fd, &hd);
  
  	/* write selinux context */
  	xwrite(fd, &block, TAR_BLOCK_SIZE);
  	return TRUE;
  }
  #endif
  
  /* Write out a tar header for the specified file/directory/whatever */
  static int writeTarHeader(struct TarBallInfo *tbInfo,
  		const char *header_name, const char *fileName, struct stat *statbuf)
  {
  	struct tar_header_t header;
  
  	memset(&header, 0, sizeof(header));
  
  	strncpy(header.name, header_name, sizeof(header.name));
  
  	/* POSIX says to mask mode with 07777. */
  	PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
  	PUT_OCTAL(header.uid, statbuf->st_uid);
  	PUT_OCTAL(header.gid, statbuf->st_gid);
  	memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
  	PUT_OCTAL(header.mtime, statbuf->st_mtime);
  
  	/* Enter the user and group names */
  	safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
  	safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
  
  	if (tbInfo->hlInfo) {
  		/* This is a hard link */
  		header.typeflag = LNKTYPE;
  		strncpy(header.linkname, tbInfo->hlInfo->name,
  				sizeof(header.linkname));
  #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
  		/* Write out long linkname if needed */
  		if (header.linkname[sizeof(header.linkname)-1])
  			writeLongname(tbInfo->tarFd, GNULONGLINK,
  					tbInfo->hlInfo->name, 0);
  #endif
  	} else if (S_ISLNK(statbuf->st_mode)) {
  		char *lpath = xmalloc_readlink_or_warn(fileName);
  		if (!lpath)
  			return FALSE;
  		header.typeflag = SYMTYPE;
  		strncpy(header.linkname, lpath, sizeof(header.linkname));
  #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
  		/* Write out long linkname if needed */
  		if (header.linkname[sizeof(header.linkname)-1])
  			writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
  #else
  		/* If it is larger than 100 bytes, bail out */
  		if (header.linkname[sizeof(header.linkname)-1]) {
  			free(lpath);
  			bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
  			return FALSE;
  		}
  #endif
  		free(lpath);
  	} else if (S_ISDIR(statbuf->st_mode)) {
  		header.typeflag = DIRTYPE;
  		/* Append '/' only if there is a space for it */
  		if (!header.name[sizeof(header.name)-1])
  			header.name[strlen(header.name)] = '/';
  	} else if (S_ISCHR(statbuf->st_mode)) {
  		header.typeflag = CHRTYPE;
  		PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
  		PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
  	} else if (S_ISBLK(statbuf->st_mode)) {
  		header.typeflag = BLKTYPE;
  		PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
  		PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
  	} else if (S_ISFIFO(statbuf->st_mode)) {
  		header.typeflag = FIFOTYPE;
  	} else if (S_ISREG(statbuf->st_mode)) {
  		/* header.size field is 12 bytes long */
  		/* Does octal-encoded size fit? */
  		uoff_t filesize = statbuf->st_size;
  		if (sizeof(filesize) <= 4
  		 || filesize <= (uoff_t)0777777777777LL
  		) {
  			PUT_OCTAL(header.size, filesize);
  		}
  		/* Does base256-encoded size fit?
  		 * It always does unless off_t is wider than 64 bits.
  		 */
  		else if (ENABLE_FEATURE_TAR_GNU_EXTENSIONS
  #if ULLONG_MAX > 0xffffffffffffffffLL /* 2^64-1 */
  		 && (filesize <= 0x3fffffffffffffffffffffffLL)
  #endif
  		) {
  			/* GNU tar uses "base-256 encoding" for very large numbers.
  			 * Encoding is binary, with highest bit always set as a marker
  			 * and sign in next-highest bit:
  			 * 80 00 .. 00 - zero
  			 * bf ff .. ff - largest positive number
  			 * ff ff .. ff - minus 1
  			 * c0 00 .. 00 - smallest negative number
  			 */
  			char *p8 = header.size + sizeof(header.size);
  			do {
  				*--p8 = (uint8_t)filesize;
  				filesize >>= 8;
  			} while (p8 != header.size);
  			*p8 |= 0x80;
  		} else {
  			bb_error_msg_and_die("can't store file '%s' "
  				"of size %"FILESIZE_FMT"u, aborting",
  				fileName, statbuf->st_size);
  		}
  		header.typeflag = REGTYPE;
  	} else {
  		bb_error_msg("%s: unknown file type", fileName);
  		return FALSE;
  	}
  
  #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
  	/* Write out long name if needed */
  	/* (we, like GNU tar, output long linkname *before* long name) */
  	if (header.name[sizeof(header.name)-1])
  		writeLongname(tbInfo->tarFd, GNULONGNAME,
  				header_name, S_ISDIR(statbuf->st_mode));
  #endif
  
  #if ENABLE_FEATURE_TAR_SELINUX
  	if (is_selinux_enabled() && (tbInfo->optFlags & ARCHIVE_STORE_SELINUX)) {
  		security_context_t sid;
  		lgetfilecon(fileName, &sid);
  		if (sid) {
  			// optional extended block
  			writeSeHeader(tbInfo->tarFd, sid, &header);
  			freecon(sid);
  		}
  	}
  #endif
  
  	/* Now write the header out to disk */
  	chksum_and_xwrite(tbInfo->tarFd, &header);
  
  	/* Now do the verbose thing (or not) */
  	if (tbInfo->verboseFlag) {
  		FILE *vbFd = stdout;
  
  		/* If archive goes to stdout, verbose goes to stderr */
  		if (tbInfo->tarFd == STDOUT_FILENO)
  			vbFd = stderr;
  		/* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
  		/* We don't have such excesses here: for us "v" == "vv" */
  		/* '/' is probably a GNUism */
  		fprintf(vbFd, "%s%s\n", header_name,
  				S_ISDIR(statbuf->st_mode) ? "/" : "");
  	}
  
  	return TRUE;
  }
  
  #if ENABLE_FEATURE_TAR_FROM
  static int exclude_file(const llist_t *excluded_files, const char *file)
  {
  	while (excluded_files) {
  		if (excluded_files->data[0] == '/') {
  			if (fnmatch(excluded_files->data, file,
  					FNM_PATHNAME | FNM_LEADING_DIR) == 0)
  				return 1;
  		} else {
  			const char *p;
  
  			for (p = file; p[0] != '\0'; p++) {
  				if ((p == file || p[-1] == '/')
  				 && p[0] != '/'
  				 && fnmatch(excluded_files->data, p,
  						FNM_PATHNAME | FNM_LEADING_DIR) == 0
  				) {
  					return 1;
  				}
  			}
  		}
  		excluded_files = excluded_files->link;
  	}
  
  	return 0;
  }
  #else
  # define exclude_file(excluded_files, file) 0
  #endif
  
  static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf,
  			void *userData, int depth UNUSED_PARAM)
  {
  	struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
  	const char *header_name;
  	int inputFileFd = -1;
  
  	DBG("writeFileToTarball('%s')", fileName);
  
  	/* Strip leading '/' and such (must be before memorizing hardlink's name) */
  	header_name = strip_unsafe_prefix(fileName);
  
  	if (header_name[0] == '\0')
  		return TRUE;
  
  	/* It is against the rules to archive a socket */
  	if (S_ISSOCK(statbuf->st_mode)) {
  		bb_error_msg("%s: socket ignored", fileName);
  		return TRUE;
  	}
  
  	/*
  	 * Check to see if we are dealing with a hard link.
  	 * If so -
  	 * Treat the first occurance of a given dev/inode as a file while
  	 * treating any additional occurances as hard links.  This is done
  	 * by adding the file information to the HardLinkInfo linked list.
  	 */
  	tbInfo->hlInfo = NULL;
  	if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) {
  		DBG("'%s': st_nlink > 1", header_name);
  		tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
  		if (tbInfo->hlInfo == NULL) {
  			DBG("'%s': addHardLinkInfo", header_name);
  			addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
  		}
  	}
  
  	/* It is a bad idea to store the archive we are in the process of creating,
  	 * so check the device and inode to be sure that this particular file isn't
  	 * the new tarball */
  	if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev
  	 && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino
  	) {
  		bb_error_msg("%s: file is the archive; skipping", fileName);
  		return TRUE;
  	}
  
  	if (exclude_file(tbInfo->excludeList, header_name))
  		return SKIP;
  
  #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
  	if (strlen(header_name) >= NAME_SIZE) {
  		bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
  		return TRUE;
  	}
  #endif
  
  	/* Is this a regular file? */
  	if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
  		/* open the file we want to archive, and make sure all is well */
  		inputFileFd = open_or_warn(fileName, O_RDONLY);
  		if (inputFileFd < 0) {
  			return FALSE;
  		}
  	}
  
  	/* Add an entry to the tarball */
  	if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
  		return FALSE;
  	}
  
  	/* If it was a regular file, write out the body */
  	if (inputFileFd >= 0) {
  		size_t readSize;
  		/* Write the file to the archive. */
  		/* We record size into header first, */
  		/* and then write out file. If file shrinks in between, */
  		/* tar will be corrupted. So we don't allow for that. */
  		/* NB: GNU tar 1.16 warns and pads with zeroes */
  		/* or even seeks back and updates header */
  		bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
  		////off_t readSize;
  		////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
  		////if (readSize != statbuf->st_size && readSize >= 0) {
  		////	bb_error_msg_and_die("short read from %s, aborting", fileName);
  		////}
  
  		/* Check that file did not grow in between? */
  		/* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
  
  		close(inputFileFd);
  
  		/* Pad the file up to the tar block size */
  		/* (a few tricks here in the name of code size) */
  		readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
  		memset(block_buf, 0, readSize);
  		xwrite(tbInfo->tarFd, block_buf, readSize);
  	}
  
  	return TRUE;
  }
  
  #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
  # if !(ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2)
  #  define vfork_compressor(tar_fd, gzip) vfork_compressor(tar_fd)
  # endif
  /* Don't inline: vfork scares gcc and pessimizes code */
  static void NOINLINE vfork_compressor(int tar_fd, int gzip)
  {
  	pid_t gzipPid;
  # if ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2
  	const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
  # elif ENABLE_FEATURE_SEAMLESS_GZ
  	const char *zip_exec = "gzip";
  # else /* only ENABLE_FEATURE_SEAMLESS_BZ2 */
  	const char *zip_exec = "bzip2";
  # endif
  	// On Linux, vfork never unpauses parent early, although standard
  	// allows for that. Do we want to waste bytes checking for it?
  # define WAIT_FOR_CHILD 0
  	volatile int vfork_exec_errno = 0;
  	struct fd_pair gzipDataPipe;
  # if WAIT_FOR_CHILD
  	struct fd_pair gzipStatusPipe;
  	xpiped_pair(gzipStatusPipe);
  # endif
  	xpiped_pair(gzipDataPipe);
  
  	signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
  
  # if defined(__GNUC__) && __GNUC__
  	/* Avoid vfork clobbering */
  	(void) &zip_exec;
  # endif
  
  	gzipPid = xvfork();
  
  	if (gzipPid == 0) {
  		/* child */
  		/* NB: close _first_, then move fds! */
  		close(gzipDataPipe.wr);
  # if WAIT_FOR_CHILD
  		close(gzipStatusPipe.rd);
  		/* gzipStatusPipe.wr will close only on exec -
  		 * parent waits for this close to happen */
  		fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC);
  # endif
  		xmove_fd(gzipDataPipe.rd, 0);
  		xmove_fd(tar_fd, 1);
  		/* exec gzip/bzip2 program/applet */
  		BB_EXECLP(zip_exec, zip_exec, "-f", (char *)0);
  		vfork_exec_errno = errno;
  		_exit(EXIT_FAILURE);
  	}
  
  	/* parent */
  	xmove_fd(gzipDataPipe.wr, tar_fd);
  	close(gzipDataPipe.rd);
  # if WAIT_FOR_CHILD
  	close(gzipStatusPipe.wr);
  	while (1) {
  		char buf;
  		int n;
  
  		/* Wait until child execs (or fails to) */
  		n = full_read(gzipStatusPipe.rd, &buf, 1);
  		if (n < 0 /* && errno == EAGAIN */)
  			continue;	/* try it again */
  	}
  	close(gzipStatusPipe.rd);
  # endif
  	if (vfork_exec_errno) {
  		errno = vfork_exec_errno;
  		bb_perror_msg_and_die("can't execute '%s'", zip_exec);
  	}
  }
  #endif /* ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 */
  
  
  /* gcc 4.2.1 inlines it, making code bigger */
  static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
  	unsigned optFlags,
  	int recurseFlags, const llist_t *include,
  	const llist_t *exclude, int gzip)
  {
  	int errorFlag = FALSE;
  	struct TarBallInfo tbInfo;
  
  	tbInfo.hlInfoHead = NULL;
  	tbInfo.tarFd = tar_fd;
  	tbInfo.verboseFlag = verboseFlag;
  	tbInfo.optFlags = optFlags;
  
  	/* Store the stat info for the tarball's file, so
  	 * can avoid including the tarball into itself....  */
  	xfstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf, "can't stat tar file");
  
  #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
  	if (gzip)
  		vfork_compressor(tbInfo.tarFd, gzip);
  #endif
  
  	tbInfo.excludeList = exclude;
  
  	/* Read the directory/files and iterate over them one at a time */
  	while (include) {
  		if (!recursive_action(include->data, recurseFlags,
  				writeFileToTarball, writeFileToTarball, &tbInfo, 0)
  		) {
  			errorFlag = TRUE;
  		}
  		include = include->link;
  	}
  	/* Write two empty blocks to the end of the archive */
  	memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
  	xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
  
  	/* To be pedantically correct, we would check if the tarball
  	 * is smaller than 20 tar blocks, and pad it if it was smaller,
  	 * but that isn't necessary for GNU tar interoperability, and
  	 * so is considered a waste of space */
  
  	/* Close so the child process (if any) will exit */
  	close(tbInfo.tarFd);
  
  	/* Hang up the tools, close up shop, head home */
  	if (ENABLE_FEATURE_CLEAN_UP)
  		freeHardLinkInfo(&tbInfo.hlInfoHead);
  
  	if (errorFlag)
  		bb_error_msg("error exit delayed from previous errors");
  
  #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
  	if (gzip) {
  		int status;
  		if (safe_waitpid(-1, &status, 0) == -1)
  			bb_perror_msg("waitpid");
  		else if (!WIFEXITED(status) || WEXITSTATUS(status))
  			/* gzip was killed or has exited with nonzero! */
  			errorFlag = TRUE;
  	}
  #endif
  	return errorFlag;
  }
  #else
  int writeTarFile(int tar_fd, int verboseFlag,
  	unsigned optFlags,
  	int recurseFlags, const llist_t *include,
  	const llist_t *exclude, int gzip);
  #endif /* FEATURE_TAR_CREATE */
  
  #if ENABLE_FEATURE_TAR_FROM
  static llist_t *append_file_list_to_list(llist_t *list)
  {
  	FILE *src_stream;
  	char *line;
  	llist_t *newlist = NULL;
  
  	while (list) {
  		src_stream = xfopen_stdin(llist_pop(&list));
  		while ((line = xmalloc_fgetline(src_stream)) != NULL) {
  			/* kill trailing '/' unless the string is just "/" */
  			char *cp = last_char_is(line, '/');
  			if (cp > line)
  				*cp = '\0';
  			llist_add_to_end(&newlist, line);
  		}
  		fclose(src_stream);
  	}
  	return newlist;
  }
  #endif
  
  //usage:#define tar_trivial_usage
  //usage:	"-[" IF_FEATURE_TAR_CREATE("c") "xt"
  //usage:	IF_FEATURE_SEAMLESS_Z("Z")
  //usage:	IF_FEATURE_SEAMLESS_GZ("z")
  //usage:	IF_FEATURE_SEAMLESS_XZ("J")
  //usage:	IF_FEATURE_SEAMLESS_BZ2("j")
  //usage:	IF_FEATURE_SEAMLESS_LZMA("a")
  //usage:	IF_FEATURE_TAR_CREATE("h")
  //usage:	IF_FEATURE_TAR_NOPRESERVE_TIME("m")
  //usage:	IF_FEATURE_TAR_SELINUX("p")
  //usage:	"vO] "
  //usage:	IF_FEATURE_TAR_FROM("[-X FILE] [-T FILE] ")
  //usage:	"[-f TARFILE] [-C DIR] [FILE]..."
  //usage:#define tar_full_usage "\n\n"
  //usage:	IF_FEATURE_TAR_CREATE("Create, extract, ")
  //usage:	IF_NOT_FEATURE_TAR_CREATE("Extract ")
  //usage:	"or list files from a tar file\n"
  //usage:     "\nOperation:"
  //usage:	IF_FEATURE_TAR_CREATE(
  //usage:     "\n	c	Create"
  //usage:	)
  //usage:     "\n	x	Extract"
  //usage:     "\n	t	List"
  //usage:     "\n	f	Name of TARFILE ('-' for stdin/out)"
  //usage:     "\n	C	Change to DIR before operation"
  //usage:     "\n	v	Verbose"
  //usage:	IF_FEATURE_SEAMLESS_Z(
  //usage:     "\n	Z	(De)compress using compress"
  //usage:	)
  //usage:	IF_FEATURE_SEAMLESS_GZ(
  //usage:     "\n	z	(De)compress using gzip"
  //usage:	)
  //usage:	IF_FEATURE_SEAMLESS_XZ(
  //usage:     "\n	J	(De)compress using xz"
  //usage:	)
  //usage:	IF_FEATURE_SEAMLESS_BZ2(
  //usage:     "\n	j	(De)compress using bzip2"
  //usage:	)
  //usage:	IF_FEATURE_SEAMLESS_LZMA(
  //usage:     "\n	a	(De)compress using lzma"
  //usage:	)
  //usage:     "\n	O	Extract to stdout"
  //usage:	IF_FEATURE_TAR_CREATE(
  //usage:     "\n	h	Follow symlinks"
  //usage:	)
  //usage:	IF_FEATURE_TAR_NOPRESERVE_TIME(
  //usage:     "\n	m	Don't restore mtime"
  //usage:	)
  //usage:	IF_FEATURE_TAR_FROM(
  //usage:	IF_FEATURE_TAR_LONG_OPTIONS(
  //usage:     "\n	exclude	File to exclude"
  //usage:	)
  //usage:     "\n	X	File with names to exclude"
  //usage:     "\n	T	File with names to include"
  //usage:	)
  //usage:	IF_FEATURE_TAR_SELINUX(
  //usage:     "\n	p	Store SELinux contexts"
  //usage:	)
  //usage:
  //usage:#define tar_example_usage
  //usage:       "$ zcat /tmp/tarball.tar.gz | tar -xf -\n"
  //usage:       "$ tar -cf /tmp/tarball.tar /usr/local\n"
  
  // Supported but aren't in --help:
  //	o	no-same-owner
  //	p	same-permissions
  //	k	keep-old
  //	no-recursion
  //	numeric-owner
  //	no-same-permissions
  //	overwrite
  //IF_FEATURE_TAR_TO_COMMAND(
  //	to-command
  //)
  
  enum {
  	OPTBIT_KEEP_OLD = 8,
  	IF_FEATURE_TAR_CREATE(   OPTBIT_CREATE      ,)
  	IF_FEATURE_TAR_CREATE(   OPTBIT_DEREFERENCE ,)
  	IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2       ,)
  	IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA        ,)
  	IF_FEATURE_TAR_FROM(     OPTBIT_INCLUDE_FROM,)
  	IF_FEATURE_TAR_FROM(     OPTBIT_EXCLUDE_FROM,)
  	IF_FEATURE_SEAMLESS_GZ(  OPTBIT_GZIP        ,)
  	IF_FEATURE_SEAMLESS_XZ(  OPTBIT_XZ          ,) // 16th bit
  	IF_FEATURE_SEAMLESS_Z(   OPTBIT_COMPRESS    ,)
  	IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
  #if ENABLE_FEATURE_TAR_LONG_OPTIONS
  	OPTBIT_NORECURSION,
  	IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND   ,)
  	OPTBIT_NUMERIC_OWNER,
  	OPTBIT_NOPRESERVE_PERM,
  	OPTBIT_OVERWRITE,
  #endif
  	OPT_TEST         = 1 << 0, // t
  	OPT_EXTRACT      = 1 << 1, // x
  	OPT_BASEDIR      = 1 << 2, // C
  	OPT_TARNAME      = 1 << 3, // f
  	OPT_2STDOUT      = 1 << 4, // O
  	OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner
  	OPT_P            = 1 << 6, // p
  	OPT_VERBOSE      = 1 << 7, // v
  	OPT_KEEP_OLD     = 1 << 8, // k
  	OPT_CREATE       = IF_FEATURE_TAR_CREATE(   (1 << OPTBIT_CREATE      )) + 0, // c
  	OPT_DEREFERENCE  = IF_FEATURE_TAR_CREATE(   (1 << OPTBIT_DEREFERENCE )) + 0, // h
  	OPT_BZIP2        = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2       )) + 0, // j
  	OPT_LZMA         = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA        )) + 0, // a
  	OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM(     (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
  	OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM(     (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
  	OPT_GZIP         = IF_FEATURE_SEAMLESS_GZ(  (1 << OPTBIT_GZIP        )) + 0, // z
  	OPT_XZ           = IF_FEATURE_SEAMLESS_XZ(  (1 << OPTBIT_XZ          )) + 0, // J
  	OPT_COMPRESS     = IF_FEATURE_SEAMLESS_Z(   (1 << OPTBIT_COMPRESS    )) + 0, // Z
  	OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
  	OPT_NORECURSION     = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NORECURSION    )) + 0, // no-recursion
  	OPT_2COMMAND        = IF_FEATURE_TAR_TO_COMMAND(  (1 << OPTBIT_2COMMAND       )) + 0, // to-command
  	OPT_NUMERIC_OWNER   = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER  )) + 0, // numeric-owner
  	OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
  	OPT_OVERWRITE       = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE      )) + 0, // overwrite
  
  	OPT_ANY_COMPRESS = (OPT_BZIP2 | OPT_LZMA | OPT_GZIP | OPT_XZ | OPT_COMPRESS),
  };
  #if ENABLE_FEATURE_TAR_LONG_OPTIONS
  static const char tar_longopts[] ALIGN1 =
  	"list\0"                No_argument       "t"
  	"extract\0"             No_argument       "x"
  	"directory\0"           Required_argument "C"
  	"file\0"                Required_argument "f"
  	"to-stdout\0"           No_argument       "O"
  	/* do not restore owner */
  	/* Note: GNU tar handles 'o' as no-same-owner only on extract,
  	 * on create, 'o' is --old-archive. We do not support --old-archive. */
  	"no-same-owner\0"       No_argument       "o"
  	"same-permissions\0"    No_argument       "p"
  	"verbose\0"             No_argument       "v"
  	"keep-old\0"            No_argument       "k"
  # if ENABLE_FEATURE_TAR_CREATE
  	"create\0"              No_argument       "c"
  	"dereference\0"         No_argument       "h"
  # endif
  # if ENABLE_FEATURE_SEAMLESS_BZ2
  	"bzip2\0"               No_argument       "j"
  # endif
  # if ENABLE_FEATURE_SEAMLESS_LZMA
  	"lzma\0"                No_argument       "a"
  # endif
  # if ENABLE_FEATURE_TAR_FROM
  	"files-from\0"          Required_argument "T"
  	"exclude-from\0"        Required_argument "X"
  # endif
  # if ENABLE_FEATURE_SEAMLESS_GZ
  	"gzip\0"                No_argument       "z"
  # endif
  # if ENABLE_FEATURE_SEAMLESS_XZ
  	"xz\0"                  No_argument       "J"
  # endif
  # if ENABLE_FEATURE_SEAMLESS_Z
  	"compress\0"            No_argument       "Z"
  # endif
  # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
  	"touch\0"               No_argument       "m"
  # endif
  	"no-recursion\0"	No_argument       "\xfa"
  # if ENABLE_FEATURE_TAR_TO_COMMAND
  	"to-command\0"		Required_argument "\xfb"
  # endif
  	/* use numeric uid/gid from tar header, not textual */
  	"numeric-owner\0"       No_argument       "\xfc"
  	/* do not restore mode */
  	"no-same-permissions\0" No_argument       "\xfd"
  	/* on unpack, open with O_TRUNC and !O_EXCL */
  	"overwrite\0"           No_argument       "\xfe"
  	/* --exclude takes next bit position in option mask, */
  	/* therefore we have to put it _after_ --no-same-permissions */
  # if ENABLE_FEATURE_TAR_FROM
  	"exclude\0"             Required_argument "\xff"
  # endif
  	;
  #endif
  
  int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  int tar_main(int argc UNUSED_PARAM, char **argv)
  {
  	archive_handle_t *tar_handle;
  	char *base_dir = NULL;
  	const char *tar_filename = "-";
  	unsigned opt;
  	int verboseFlag = 0;
  #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
  	llist_t *excludes = NULL;
  #endif
  
  	/* Initialise default values */
  	tar_handle = init_handle();
  	tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS
  	                     | ARCHIVE_RESTORE_DATE
  	                     | ARCHIVE_UNLINK_OLD;
  
  	/* Apparently only root's tar preserves perms (see bug 3844) */
  	if (getuid() != 0)
  		tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
  
  	/* Prepend '-' to the first argument if required */
  	opt_complementary = "--:" // first arg is options
  		"tt:vv:" // count -t,-v
  		IF_FEATURE_TAR_FROM("X::T::") // cumulative lists
  #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
  		"\xff::" // cumulative lists for --exclude
  #endif
  		IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
  		IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
  		IF_NOT_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive
  #if ENABLE_FEATURE_TAR_LONG_OPTIONS
  	applet_long_options = tar_longopts;
  #endif
  #if ENABLE_DESKTOP
  	if (argv[1] && argv[1][0] != '-') {
  		/* Compat:
  		 * 1st argument without dash handles options with parameters
  		 * differently from dashed one: it takes *next argv[i]*
  		 * as paramenter even if there are more chars in 1st argument:
  		 *  "tar fx TARFILE" - "x" is not taken as f's param
  		 *  but is interpreted as -x option
  		 *  "tar -xf TARFILE" - dashed equivalent of the above
  		 *  "tar -fx ..." - "x" is taken as f's param
  		 * getopt32 wouldn't handle 1st command correctly.
  		 * Unfortunately, people do use such commands.
  		 * We massage argv[1] to work around it by moving 'f'
  		 * to the end of the string.
  		 * More contrived "tar fCx TARFILE DIR" still fails,
  		 * but such commands are much less likely to be used.
  		 */
  		char *f = strchr(argv[1], 'f');
  		if (f) {
  			while (f[1] != '\0') {
  				*f = f[1];
  				f++;
  			}
  			*f = 'f';
  		}
  	}
  #endif
  	opt = getopt32(argv,
  		"txC:f:Oopvk"
  		IF_FEATURE_TAR_CREATE(   "ch"  )
  		IF_FEATURE_SEAMLESS_BZ2( "j"   )
  		IF_FEATURE_SEAMLESS_LZMA("a"   )
  		IF_FEATURE_TAR_FROM(     "T:X:")
  		IF_FEATURE_SEAMLESS_GZ(  "z"   )
  		IF_FEATURE_SEAMLESS_XZ(  "J"   )
  		IF_FEATURE_SEAMLESS_Z(   "Z"   )
  		IF_FEATURE_TAR_NOPRESERVE_TIME("m")
  		, &base_dir // -C dir
  		, &tar_filename // -f filename
  		IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
  		IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
  		IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command
  #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
  		, &excludes // --exclude
  #endif
  		, &verboseFlag // combined count for -t and -v
  		, &verboseFlag // combined count for -t and -v
  		);
  	//bb_error_msg("opt:%08x", opt);
  	argv += optind;
  
  	if (verboseFlag) tar_handle->action_header = header_verbose_list;
  	if (verboseFlag == 1) tar_handle->action_header = header_list;
  
  	if (opt & OPT_EXTRACT)
  		tar_handle->action_data = data_extract_all;
  
  	if (opt & OPT_2STDOUT)
  		tar_handle->action_data = data_extract_to_stdout;
  
  	if (opt & OPT_2COMMAND) {
  		putenv((char*)"TAR_FILETYPE=f");
  		signal(SIGPIPE, SIG_IGN);
  		tar_handle->action_data = data_extract_to_command;
  		IF_FEATURE_TAR_TO_COMMAND(tar_handle->tar__to_command_shell = xstrdup(get_shell_name());)
  	}
  
  	if (opt & OPT_KEEP_OLD)
  		tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
  
  	if (opt & OPT_NUMERIC_OWNER)
  		tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER;
  
  	if (opt & OPT_NOPRESERVE_OWNER)
  		tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER;
  
  	if (opt & OPT_NOPRESERVE_PERM)
  		tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
  
  #if ENABLE_FEATURE_TAR_SELINUX
  	if (opt & OPT_P)
  		tar_handle->ah_flags |= ARCHIVE_STORE_SELINUX;
  #endif
  
  	if (opt & OPT_OVERWRITE) {
  		tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
  		tar_handle->ah_flags |= ARCHIVE_O_TRUNC;
  	}
  
  	if (opt & OPT_NOPRESERVE_TIME)
  		tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE;
  
  #if ENABLE_FEATURE_TAR_FROM
  	tar_handle->reject = append_file_list_to_list(tar_handle->reject);
  # if ENABLE_FEATURE_TAR_LONG_OPTIONS
  	/* Append excludes to reject */
  	while (excludes) {
  		llist_t *next = excludes->link;
  		excludes->link = tar_handle->reject;
  		tar_handle->reject = excludes;
  		excludes = next;
  	}
  # endif
  	tar_handle->accept = append_file_list_to_list(tar_handle->accept);
  #endif
  
  	/* Setup an array of filenames to work with */
  	/* TODO: This is the same as in ar, make a separate function? */
  	while (*argv) {
  		/* kill trailing '/' unless the string is just "/" */
  		char *cp = last_char_is(*argv, '/');
  		if (cp > *argv)
  			*cp = '\0';
  		llist_add_to_end(&tar_handle->accept, *argv);
  		argv++;
  	}
  
  	if (tar_handle->accept || tar_handle->reject)
  		tar_handle->filter = filter_accept_reject_list;
  
  	/* Open the tar file */
  	{
  		int tar_fd = STDIN_FILENO;
  		int flags = O_RDONLY;
  
  		if (opt & OPT_CREATE) {
  			/* Make sure there is at least one file to tar up */
  			if (tar_handle->accept == NULL)
  				bb_error_msg_and_die("empty archive");
  
  			tar_fd = STDOUT_FILENO;
  			/* Mimicking GNU tar 1.15.1: */
  			flags = O_WRONLY | O_CREAT | O_TRUNC;
  		}
  
  		if (LONE_DASH(tar_filename)) {
  			tar_handle->src_fd = tar_fd;
  			tar_handle->seek = seek_by_read;
  		} else {
  			if (ENABLE_FEATURE_TAR_AUTODETECT
  			 && flags == O_RDONLY
  			 && !(opt & OPT_ANY_COMPRESS)
  			) {
  				tar_handle->src_fd = open_zipped(tar_filename, /*fail_if_not_compressed:*/ 0);
  				if (tar_handle->src_fd < 0)
  					bb_perror_msg_and_die("can't open '%s'", tar_filename);
  			} else {
  				tar_handle->src_fd = xopen(tar_filename, flags);
  			}
  		}
  	}
  
  	if (base_dir)
  		xchdir(base_dir);
  
  	//if (SEAMLESS_COMPRESSION || OPT_COMPRESS)
  	//	/* We need to know whether child (gzip/bzip/etc) exits abnormally */
  	//	signal(SIGCHLD, check_errors_in_children);
  
  	/* Create an archive */
  	if (opt & OPT_CREATE) {
  #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
  		int zipMode = 0;
  		if (ENABLE_FEATURE_SEAMLESS_GZ && (opt & OPT_GZIP))
  			zipMode = 1;
  		if (ENABLE_FEATURE_SEAMLESS_BZ2 && (opt & OPT_BZIP2))
  			zipMode = 2;
  #endif
  		/* NB: writeTarFile() closes tar_handle->src_fd */
  		return writeTarFile(tar_handle->src_fd, verboseFlag,
  				tar_handle->ah_flags,
  				(opt & OPT_DEREFERENCE ? ACTION_FOLLOWLINKS : 0)
  				| (opt & OPT_NORECURSION ? 0 : ACTION_RECURSE),
  				tar_handle->accept,
  				tar_handle->reject, zipMode);
  	}
  
  	if (opt & OPT_ANY_COMPRESS) {
  		USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_aux_data_t *aux, int src_fd, int dst_fd);)
  		USE_FOR_NOMMU(const char *xformer_prog;)
  
  		if (opt & OPT_COMPRESS)
  			USE_FOR_MMU(xformer = unpack_Z_stream;)
  			USE_FOR_NOMMU(xformer_prog = "uncompress";)
  		if (opt & OPT_GZIP)
  			USE_FOR_MMU(xformer = unpack_gz_stream;)
  			USE_FOR_NOMMU(xformer_prog = "gunzip";)
  		if (opt & OPT_BZIP2)
  			USE_FOR_MMU(xformer = unpack_bz2_stream;)
  			USE_FOR_NOMMU(xformer_prog = "bunzip2";)
  		if (opt & OPT_LZMA)
  			USE_FOR_MMU(xformer = unpack_lzma_stream;)
  			USE_FOR_NOMMU(xformer_prog = "unlzma";)
  		if (opt & OPT_XZ)
  			USE_FOR_MMU(xformer = unpack_xz_stream;)
  			USE_FOR_NOMMU(xformer_prog = "unxz";)
  
  		open_transformer_with_sig(tar_handle->src_fd, xformer, xformer_prog);
  		/* Can't lseek over pipes */
  		tar_handle->seek = seek_by_read;
  		/*tar_handle->offset = 0; - already is */
  	}
  
  	/* Zero processed headers (== empty file) is not a valid tarball.
  	 * We (ab)use bb_got_signal as exitcode here,
  	 * because check_errors_in_children() uses _it_ as error indicator.
  	 */
  	bb_got_signal = EXIT_FAILURE;
  
  	while (get_header_tar(tar_handle) == EXIT_SUCCESS)
  		bb_got_signal = EXIT_SUCCESS; /* saw at least one header, good */
  
  	/* Check that every file that should have been extracted was */
  	while (tar_handle->accept) {
  		if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
  		 && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
  		) {
  			bb_error_msg_and_die("%s: not found in archive",
  				tar_handle->accept->data);
  		}
  		tar_handle->accept = tar_handle->accept->link;
  	}
  	if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
  		close(tar_handle->src_fd);
  
  	if (SEAMLESS_COMPRESSION || OPT_COMPRESS) {
  		/* Set bb_got_signal to 1 if a child died with !0 exitcode */
  		check_errors_in_children(0);
  	}
  
  	return bb_got_signal;
  }
  