Virgin import (trimmed) of GNU Tar version 1.13.25.

1 files changed, 1550 insertions, 0 deletions

diff --git a/contrib/tar/src/create.c b/contrib/tar/src/create.c
new file mode 100644
index 0000000..b3de6a8
--- /dev/null
+++ b/contrib/tar/src/create.c
@@ -0,0 +1,1550 @@
+/* Create a tar archive.
+   Copyright 1985,92,93,94,96,97,99,2000, 2001 Free Software Foundation, Inc.
+   Written by John Gilmore, on 1985-08-25.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option) any later
+   version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
+   Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this program; if not, write to the Free Software Foundation, Inc.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "system.h"
+
+#if !MSDOS
+# include <pwd.h>
+# include <grp.h>
+#endif
+
+#if HAVE_UTIME_H
+# include <utime.h>
+#else
+struct utimbuf
+  {
+    long actime;
+    long modtime;
+  };
+#endif
+
+#include <quotearg.h>
+
+#include "common.h"
+#include <hash.h>
+
+#ifndef MSDOS
+extern dev_t ar_dev;
+extern ino_t ar_ino;
+#endif
+
+struct link
+  {
+    dev_t dev;
+    ino_t ino;
+    char name[1];
+  };
+
+/* The maximum uintmax_t value that can be represented with DIGITS digits,
+   assuming that each digit is BITS_PER_DIGIT wide.  */
+#define MAX_VAL_WITH_DIGITS(digits, bits_per_digit) \
+   ((digits) * (bits_per_digit) < sizeof (uintmax_t) * CHAR_BIT \
+    ? ((uintmax_t) 1 << ((digits) * (bits_per_digit))) - 1 \
+    : (uintmax_t) -1)
+
+/* Convert VALUE to an octal representation suitable for tar headers.
+   Output to buffer WHERE with size SIZE.
+   The result is undefined if SIZE is 0 or if VALUE is too large to fit.  */
+
+static void
+to_octal (uintmax_t value, char *where, size_t size)
+{
+  uintmax_t v = value;
+  size_t i = size;
+
+  do
+    {
+      where[--i] = '0' + (v & ((1 << LG_8) - 1));
+      v >>= LG_8;
+    }
+  while (i);
+}
+
+/* Convert NEGATIVE VALUE to a base-256 representation suitable for
+   tar headers.  NEGATIVE is 1 if VALUE was negative before being cast
+   to uintmax_t, 0 otherwise.  Output to buffer WHERE with size SIZE.
+   The result is undefined if SIZE is 0 or if VALUE is too large to
+   fit.  */
+
+static void
+to_base256 (int negative, uintmax_t value, char *where, size_t size)
+{
+  uintmax_t v = value;
+  uintmax_t propagated_sign_bits =
+    ((uintmax_t) - negative << (CHAR_BIT * sizeof v - LG_256));
+  size_t i = size;
+
+  do
+    {
+      where[--i] = v & ((1 << LG_256) - 1);
+      v = propagated_sign_bits | (v >> LG_256);
+    }
+  while (i);
+}
+
+/* Convert NEGATIVE VALUE (which was originally of size VALSIZE) to
+   external form, using SUBSTITUTE (...) if VALUE won't fit.  Output
+   to buffer WHERE with size SIZE.  NEGATIVE is 1 iff VALUE was
+   negative before being cast to uintmax_t; its original bitpattern
+   can be deduced from VALSIZE, its original size before casting.
+   TYPE is the kind of value being output (useful for diagnostics).
+   Prefer the POSIX format of SIZE - 1 octal digits (with leading zero
+   digits), followed by '\0'.  If this won't work, and if GNU or
+   OLDGNU format is allowed, use '\200' followed by base-256, or (if
+   NEGATIVE is nonzero) '\377' followed by two's complement base-256.
+   If neither format works, use SUBSTITUTE (...)  instead.  Pass to
+   SUBSTITUTE the address of an 0-or-1 flag recording whether the
+   substitute value is negative.  */
+
+static void
+to_chars (int negative, uintmax_t value, size_t valsize,
+	  uintmax_t (*substitute) PARAMS ((int *)),
+	  char *where, size_t size, const char *type)
+{
+  int base256_allowed = (archive_format == GNU_FORMAT
+			 || archive_format == OLDGNU_FORMAT);
+
+  /* Generate the POSIX octal representation if the number fits.  */
+  if (! negative && value <= MAX_VAL_WITH_DIGITS (size - 1, LG_8))
+    {
+      where[size - 1] = '\0';
+      to_octal (value, where, size - 1);
+    }
+
+  /* Otherwise, generate the base-256 representation if we are
+     generating an old or new GNU format and if the number fits.  */
+  else if (((negative ? -1 - value : value)
+	    <= MAX_VAL_WITH_DIGITS (size - 1, LG_256))
+	   && base256_allowed)
+    {
+      where[0] = negative ? -1 : 1 << (LG_256 - 1);
+      to_base256 (negative, value, where + 1, size - 1);
+    }
+
+  /* Otherwise, if the number is negative, and if it would not cause
+     ambiguity on this host by confusing positive with negative
+     values, then generate the POSIX octal representation of the value
+     modulo 2**(field bits).  The resulting tar file is
+     machine-dependent, since it depends on the host word size.  Yuck!
+     But this is the traditional behavior.  */
+  else if (negative && valsize * CHAR_BIT <= (size - 1) * LG_8)
+    {
+      static int warned_once;
+      if (! warned_once)
+	{
+	  warned_once = 1;
+	  WARN ((0, 0, _("Generating negative octal headers")));
+	}
+      where[size - 1] = '\0';
+      to_octal (value & MAX_VAL_WITH_DIGITS (valsize * CHAR_BIT, 1),
+		where, size - 1);
+    }
+
+  /* Otherwise, output a substitute value if possible (with a
+     warning), and an error message if not.  */
+  else
+    {
+      uintmax_t maxval = (base256_allowed
+			  ? MAX_VAL_WITH_DIGITS (size - 1, LG_256)
+			  : MAX_VAL_WITH_DIGITS (size - 1, LG_8));
+      char valbuf[UINTMAX_STRSIZE_BOUND + 1];
+      char maxbuf[UINTMAX_STRSIZE_BOUND];
+      char minbuf[UINTMAX_STRSIZE_BOUND + 1];
+      char const *minval_string;
+      char const *maxval_string = STRINGIFY_BIGINT (maxval, maxbuf);
+      char const *value_string;
+
+      if (base256_allowed)
+	{
+	  uintmax_t m = maxval + 1 ? maxval + 1 : maxval / 2 + 1;
+	  char *p = STRINGIFY_BIGINT (m, minbuf + 1);
+	  *--p = '-';
+	  minval_string = p;
+	}
+      else
+	minval_string = "0";
+
+      if (negative)
+	{
+	  char *p = STRINGIFY_BIGINT (- value, valbuf + 1);
+	  *--p = '-';
+	  value_string = p;
+	}
+      else
+	value_string = STRINGIFY_BIGINT (value, valbuf);
+
+      if (substitute)
+	{
+	  int negsub;
+	  uintmax_t sub = substitute (&negsub) & maxval;
+	  uintmax_t s = (negsub &= archive_format == GNU_FORMAT) ? - sub : sub;
+	  char subbuf[UINTMAX_STRSIZE_BOUND + 1];
+	  char *sub_string = STRINGIFY_BIGINT (s, subbuf + 1);
+	  if (negsub)
+	    *--sub_string = '-';
+	  WARN ((0, 0, _("value %s out of %s range %s..%s; substituting %s"),
+		 value_string, type, minval_string, maxval_string,
+		 sub_string));
+	  to_chars (negsub, s, valsize, 0, where, size, type);
+	}
+      else
+	ERROR ((0, 0, _("value %s out of %s range %s..%s"),
+		value_string, type, minval_string, maxval_string));
+    }
+}
+
+static uintmax_t
+gid_substitute (int *negative)
+{
+  gid_t r;
+#ifdef GID_NOBODY
+  r = GID_NOBODY;
+#else
+  static gid_t gid_nobody;
+  if (!gid_nobody && !gname_to_gid ("nobody", &gid_nobody))
+    gid_nobody = -2;
+  r = gid_nobody;
+#endif
+  *negative = r < 0;
+  return r;
+}
+
+void
+gid_to_chars (gid_t v, char *p, size_t s)
+{
+  to_chars (v < 0, (uintmax_t) v, sizeof v, gid_substitute, p, s, "gid_t");
+}
+
+void
+major_to_chars (major_t v, char *p, size_t s)
+{
+  to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "major_t");
+}
+
+void
+minor_to_chars (minor_t v, char *p, size_t s)
+{
+  to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "minor_t");
+}
+
+void
+mode_to_chars (mode_t v, char *p, size_t s)
+{
+  /* In the common case where the internal and external mode bits are the same,
+     and we are not using POSIX or GNU format,
+     propagate all unknown bits to the external mode.
+     This matches historical practice.
+     Otherwise, just copy the bits we know about.  */
+  int negative;
+  uintmax_t u;
+  if (S_ISUID == TSUID && S_ISGID == TSGID && S_ISVTX == TSVTX
+      && S_IRUSR == TUREAD && S_IWUSR == TUWRITE && S_IXUSR == TUEXEC
+      && S_IRGRP == TGREAD && S_IWGRP == TGWRITE && S_IXGRP == TGEXEC
+      && S_IROTH == TOREAD && S_IWOTH == TOWRITE && S_IXOTH == TOEXEC
+      && archive_format != POSIX_FORMAT
+      && archive_format != GNU_FORMAT)
+    {
+      negative = v < 0;
+      u = v;
+    }
+  else
+    {
+      negative = 0;
+      u = ((v & S_ISUID ? TSUID : 0)
+	   | (v & S_ISGID ? TSGID : 0)
+	   | (v & S_ISVTX ? TSVTX : 0)
+	   | (v & S_IRUSR ? TUREAD : 0)
+	   | (v & S_IWUSR ? TUWRITE : 0)
+	   | (v & S_IXUSR ? TUEXEC : 0)
+	   | (v & S_IRGRP ? TGREAD : 0)
+	   | (v & S_IWGRP ? TGWRITE : 0)
+	   | (v & S_IXGRP ? TGEXEC : 0)
+	   | (v & S_IROTH ? TOREAD : 0)
+	   | (v & S_IWOTH ? TOWRITE : 0)
+	   | (v & S_IXOTH ? TOEXEC : 0));
+    }
+  to_chars (negative, u, sizeof v, 0, p, s, "mode_t");
+}
+
+void
+off_to_chars (off_t v, char *p, size_t s)
+{
+  to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "off_t");
+}
+
+void
+size_to_chars (size_t v, char *p, size_t s)
+{
+  to_chars (0, (uintmax_t) v, sizeof v, 0, p, s, "size_t");
+}
+
+void
+time_to_chars (time_t v, char *p, size_t s)
+{
+  to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "time_t");
+}
+
+static uintmax_t
+uid_substitute (int *negative)
+{
+  uid_t r;
+#ifdef UID_NOBODY
+  r = UID_NOBODY;
+#else
+  static uid_t uid_nobody;
+  if (!uid_nobody && !uname_to_uid ("nobody", &uid_nobody))
+    uid_nobody = -2;
+  r = uid_nobody;
+#endif
+  *negative = r < 0;
+  return r;
+}
+
+void
+uid_to_chars (uid_t v, char *p, size_t s)
+{
+  to_chars (v < 0, (uintmax_t) v, sizeof v, uid_substitute, p, s, "uid_t");
+}
+
+void
+uintmax_to_chars (uintmax_t v, char *p, size_t s)
+{
+  to_chars (0, v, sizeof v, 0, p, s, "uintmax_t");
+}
+
+/* Writing routines.  */
+
+/* Zero out the buffer so we don't confuse ourselves with leftover
+   data.  */
+static void
+clear_buffer (char *buffer)
+{
+  memset (buffer, 0, BLOCKSIZE);
+}
+
+/* Write the EOT block(s).  Zero at least two blocks, through the end
+   of the record.  Old tar, as previous versions of GNU tar, writes
+   garbage after two zeroed blocks.  */
+void
+write_eot (void)
+{
+  union block *pointer = find_next_block ();
+  memset (pointer->buffer, 0, BLOCKSIZE);
+  set_next_block_after (pointer);
+  pointer = find_next_block ();
+  memset (pointer->buffer, 0, available_space_after (pointer));
+  set_next_block_after (pointer);
+}
+
+/* Write a GNUTYPE_LONGLINK or GNUTYPE_LONGNAME block.  */
+
+/* FIXME: Cross recursion between start_header and write_long!  */
+
+static union block *start_header PARAMS ((const char *, struct stat *));
+
+static void
+write_long (const char *p, char type)
+{
+  size_t size = strlen (p) + 1;
+  size_t bufsize;
+  union block *header;
+  struct stat foo;
+
+  memset (&foo, 0, sizeof foo);
+  foo.st_size = size;
+
+  header = start_header ("././@LongLink", &foo);
+  header->header.typeflag = type;
+  finish_header (header);
+
+  header = find_next_block ();
+
+  bufsize = available_space_after (header);
+
+  while (bufsize < size)
+    {
+      memcpy (header->buffer, p, bufsize);
+      p += bufsize;
+      size -= bufsize;
+      set_next_block_after (header + (bufsize - 1) / BLOCKSIZE);
+      header = find_next_block ();
+      bufsize = available_space_after (header);
+    }
+  memcpy (header->buffer, p, size);
+  memset (header->buffer + size, 0, bufsize - size);
+  set_next_block_after (header + (size - 1) / BLOCKSIZE);
+}
+
+/* Return a suffix of the file NAME that is a relative file name.
+   Warn about `..' in file names.  But return NAME if the user wants
+   absolute file names.  */
+static char const *
+relativize (char const *name)
+{
+  if (! absolute_names_option)
+    {
+      {
+	static int warned_once;
+	if (! warned_once && contains_dot_dot (name))
+	  {
+	    warned_once = 1;
+	    WARN ((0, 0, _("Member names contain `..'")));
+	  }
+      }
+
+      {
+	size_t prefix_len = FILESYSTEM_PREFIX_LEN (name);
+
+	while (ISSLASH (name[prefix_len]))
+	  prefix_len++;
+
+	if (prefix_len)
+	  {
+	    static int warned_once;
+	    if (!warned_once)
+	      {
+		warned_once = 1;
+		WARN ((0, 0, _("Removing leading `%.*s' from member names"),
+		       (int) prefix_len, name));
+	      }
+	    name += prefix_len;
+	  }
+      }
+    }
+
+  return name;
+}
+
+/* Header handling.  */
+
+/* Make a header block for the file whose stat info is st,
+   and return its address.  */
+
+static union block *
+start_header (const char *name, struct stat *st)
+{
+  union block *header;
+
+  name = relativize (name);
+
+  if (sizeof header->header.name <= strlen (name))
+    write_long (name, GNUTYPE_LONGNAME);
+  header = find_next_block ();
+  memset (header->buffer, 0, sizeof (union block));
+
+  assign_string (&current_file_name, name);
+
+  strncpy (header->header.name, name, NAME_FIELD_SIZE);
+  header->header.name[NAME_FIELD_SIZE - 1] = '\0';
+
+  /* Override some stat fields, if requested to do so.  */
+
+  if (owner_option != (uid_t) -1)
+    st->st_uid = owner_option;
+  if (group_option != (gid_t) -1)
+    st->st_gid = group_option;
+  if (mode_option)
+    st->st_mode = ((st->st_mode & ~MODE_ALL)
+		   | mode_adjust (st->st_mode, mode_option));
+
+  /* Paul Eggert tried the trivial test ($WRITER cf a b; $READER tvf a)
+     for a few tars and came up with the following interoperability
+     matrix:
+
+	      WRITER
+	1 2 3 4 5 6 7 8 9   READER
+	. . . . . . . . .   1 = SunOS 4.2 tar
+	# . . # # . . # #   2 = NEC SVR4.0.2 tar
+	. . . # # . . # .   3 = Solaris 2.1 tar
+	. . . . . . . . .   4 = GNU tar 1.11.1
+	. . . . . . . . .   5 = HP-UX 8.07 tar
+	. . . . . . . . .   6 = Ultrix 4.1
+	. . . . . . . . .   7 = AIX 3.2
+	. . . . . . . . .   8 = Hitachi HI-UX 1.03
+	. . . . . . . . .   9 = Omron UNIOS-B 4.3BSD 1.60Beta
+
+	     . = works
+	     # = ``impossible file type''
+
+     The following mask for old archive removes the `#'s in column 4
+     above, thus making GNU tar both a universal donor and a universal
+     acceptor for Paul's test.  */
+
+  if (archive_format == V7_FORMAT)
+    MODE_TO_CHARS (st->st_mode & MODE_ALL, header->header.mode);
+  else
+    MODE_TO_CHARS (st->st_mode, header->header.mode);
+
+  UID_TO_CHARS (st->st_uid, header->header.uid);
+  GID_TO_CHARS (st->st_gid, header->header.gid);
+  OFF_TO_CHARS (st->st_size, header->header.size);
+  TIME_TO_CHARS (st->st_mtime, header->header.mtime);
+
+  if (incremental_option)
+    if (archive_format == OLDGNU_FORMAT)
+      {
+	TIME_TO_CHARS (st->st_atime, header->oldgnu_header.atime);
+	TIME_TO_CHARS (st->st_ctime, header->oldgnu_header.ctime);
+      }
+
+  header->header.typeflag = archive_format == V7_FORMAT ? AREGTYPE : REGTYPE;
+
+  switch (archive_format)
+    {
+    case V7_FORMAT:
+      break;
+
+    case OLDGNU_FORMAT:
+      /* Overwrite header->header.magic and header.version in one blow.  */
+      strcpy (header->header.magic, OLDGNU_MAGIC);
+      break;
+
+    case POSIX_FORMAT:
+    case GNU_FORMAT:
+      strncpy (header->header.magic, TMAGIC, TMAGLEN);
+      strncpy (header->header.version, TVERSION, TVERSLEN);
+      break;
+
+    default:
+      abort ();
+    }
+
+  if (archive_format == V7_FORMAT || numeric_owner_option)
+    {
+      /* header->header.[ug]name are left as the empty string.  */
+    }
+  else
+    {
+      uid_to_uname (st->st_uid, header->header.uname);
+      gid_to_gname (st->st_gid, header->header.gname);
+    }
+
+  return header;
+}
+
+/* Finish off a filled-in header block and write it out.  We also
+   print the file name and/or full info if verbose is on.  */
+void
+finish_header (union block *header)
+{
+  size_t i;
+  int sum;
+  char *p;
+
+  memcpy (header->header.chksum, CHKBLANKS, sizeof header->header.chksum);
+
+  sum = 0;
+  p = header->buffer;
+  for (i = sizeof *header; i-- != 0; )
+    /* We can't use unsigned char here because of old compilers, e.g. V7.  */
+    sum += 0xFF & *p++;
+
+  /* Fill in the checksum field.  It's formatted differently from the
+     other fields: it has [6] digits, a null, then a space -- rather than
+     digits, then a null.  We use to_chars.
+     The final space is already there, from
+     checksumming, and to_chars doesn't modify it.
+
+     This is a fast way to do:
+
+     sprintf(header->header.chksum, "%6o", sum);  */
+
+  uintmax_to_chars ((uintmax_t) sum, header->header.chksum, 7);
+
+  if (verbose_option
+      && header->header.typeflag != GNUTYPE_LONGLINK
+      && header->header.typeflag != GNUTYPE_LONGNAME)
+    {
+      /* These globals are parameters to print_header, sigh.  */
+
+      current_header = header;
+      /* current_stat is already set up.  */
+      current_format = archive_format;
+      print_header ();
+    }
+
+  set_next_block_after (header);
+}
+
+/* Sparse file processing.  */
+
+/* Takes a blockful of data and basically cruises through it to see if
+   it's made *entirely* of zeros, returning a 0 the instant it finds
+   something that is a nonzero, i.e., useful data.  */
+static int
+zero_block_p (char *buffer)
+{
+  int counter;
+
+  for (counter = 0; counter < BLOCKSIZE; counter++)
+    if (buffer[counter] != '\0')
+      return 0;
+  return 1;
+}
+
+static void
+init_sparsearray (void)
+{
+  sp_array_size = 10;
+
+  /* Make room for our scratch space -- initially is 10 elts long.  */
+
+  sparsearray = xmalloc (sp_array_size * sizeof (struct sp_array));
+}
+
+static off_t
+find_new_file_size (int sparses)
+{
+  int i;
+  off_t s = 0;
+  for (i = 0; i < sparses; i++)
+    s += sparsearray[i].numbytes;
+  return s;
+}
+
+/* Make one pass over the file NAME, studying where any non-zero data
+   is, that is, how far into the file each instance of data is, and
+   how many bytes are there.  Save this information in the
+   sparsearray, which will later be translated into header
+   information.  */
+
+/* There is little point in trimming small amounts of null data at the head
+   and tail of blocks, only avoid dumping full null blocks.  */
+
+/* FIXME: this routine might accept bits of algorithmic cleanup, it is
+   too kludgey for my taste...  */
+
+static int
+deal_with_sparse (char *name, union block *header)
+{
+  size_t numbytes = 0;
+  off_t offset = 0;
+  int file;
+  int sparses = 0;
+  ssize_t count;
+  char buffer[BLOCKSIZE];
+
+  if (archive_format == OLDGNU_FORMAT)
+    header->oldgnu_header.isextended = 0;
+
+  if (file = open (name, O_RDONLY), file < 0)
+    /* This problem will be caught later on, so just return.  */
+    return 0;
+
+  init_sparsearray ();
+  clear_buffer (buffer);
+
+  for (;;)
+    {
+      /* Realloc the scratch area as necessary.  FIXME: should reallocate
+	 only at beginning of a new instance of non-zero data.  */
+
+      if (sp_array_size <= sparses)
+	{
+	  sparsearray =
+	    xrealloc (sparsearray,
+		      2 * sp_array_size * sizeof (struct sp_array));
+	  sp_array_size *= 2;
+	}
+      
+      count = safe_read (file, buffer, sizeof buffer);
+      if (count <= 0)
+	break;
+
+      /* Process one block.  */
+
+      if (count == sizeof buffer)
+
+	if (zero_block_p (buffer))
+	  {
+	    if (numbytes)
+	      {
+		sparsearray[sparses++].numbytes = numbytes;
+		numbytes = 0;
+	      }
+	  }
+	else
+	  {
+	    if (!numbytes)
+	      sparsearray[sparses].offset = offset;
+	    numbytes += count;
+	  }
+
+      else
+
+	/* Since count < sizeof buffer, we have the last bit of the file.  */
+
+	if (!zero_block_p (buffer))
+	  {
+	    if (!numbytes)
+	      sparsearray[sparses].offset = offset;
+	    numbytes += count;
+	  }
+	else
+	  /* The next two lines are suggested by Andreas Degert, who says
+	     they are required for trailing full blocks to be written to the
+	     archive, when all zeroed.  Yet, it seems to me that the case
+	     does not apply.  Further, at restore time, the file is not as
+	     sparse as it should.  So, some serious cleanup is *also* needed
+	     in this area.  Just one more... :-(.  FIXME.  */
+	  if (numbytes)
+	    numbytes += count;
+
+      /* Prepare for next block.  */
+
+      offset += count;
+      /* FIXME: do not clear unless necessary.  */
+      clear_buffer (buffer);
+    }
+
+  if (numbytes)
+    sparsearray[sparses++].numbytes = numbytes;
+  else
+    {
+      sparsearray[sparses].offset = offset - 1;
+      sparsearray[sparses++].numbytes = 1;
+    }
+
+  return close (file) == 0 && 0 <= count ? sparses : 0;
+}
+
+static int
+finish_sparse_file (int file, off_t *sizeleft, off_t fullsize, char *name)
+{
+  union block *start;
+  size_t bufsize;
+  int sparses = 0;
+  ssize_t count;
+
+  while (*sizeleft > 0)
+    {
+      start = find_next_block ();
+      memset (start->buffer, 0, BLOCKSIZE);
+      bufsize = sparsearray[sparses].numbytes;
+      if (! bufsize)
+	abort ();
+
+      if (lseek (file, sparsearray[sparses++].offset, SEEK_SET) < 0)
+	{
+	  (ignore_failed_read_option ? seek_warn_details : seek_error_details)
+	    (name, sparsearray[sparses - 1].offset);
+	  break;
+	}
+
+      /* If the number of bytes to be written here exceeds the size of
+	 the temporary buffer, do it in steps.  */
+
+      while (bufsize > BLOCKSIZE)
+	{
+	  count = safe_read (file, start->buffer, BLOCKSIZE);
+	  if (count < 0)
+	    {
+	      (ignore_failed_read_option
+	       ? read_warn_details
+	       : read_error_details)
+		(name, fullsize - *sizeleft, bufsize);
+	      return 1;
+	    }
+	  bufsize -= count;
+	  *sizeleft -= count;
+	  set_next_block_after (start);
+	  start = find_next_block ();
+	  memset (start->buffer, 0, BLOCKSIZE);
+	}
+
+      {
+	char buffer[BLOCKSIZE];
+
+	clear_buffer (buffer);
+	count = safe_read (file, buffer, bufsize);
+	memcpy (start->buffer, buffer, BLOCKSIZE);
+      }
+
+      if (count < 0)
+	{
+	  (ignore_failed_read_option
+	   ? read_warn_details
+	   : read_error_details)
+	    (name, fullsize - *sizeleft, bufsize);
+	  return 1;
+	}
+
+      *sizeleft -= count;
+      set_next_block_after (start);
+    }
+  free (sparsearray);
+#if 0
+  set_next_block_after (start + (count - 1) / BLOCKSIZE);
+#endif
+  return 0;
+}
+
+/* Main functions of this module.  */
+
+void
+create_archive (void)
+{
+  char *p;
+
+  open_archive (ACCESS_WRITE);
+
+  if (incremental_option)
+    {
+      size_t buffer_size = 1000;
+      char *buffer = xmalloc (buffer_size);
+      const char *q;
+
+      collect_and_sort_names ();
+
+      while (p = name_from_list (), p)
+	if (!excluded_name (p))
+	  dump_file (p, -1, (dev_t) 0);
+
+      blank_name_list ();
+      while (p = name_from_list (), p)
+	if (!excluded_name (p))
+	  {
+	    size_t plen = strlen (p);
+	    if (buffer_size <= plen)
+	      {
+		while ((buffer_size *= 2) <= plen)
+		  continue;
+		buffer = xrealloc (buffer, buffer_size);
+	      }
+	    memcpy (buffer, p, plen);
+	    if (! ISSLASH (buffer[plen - 1]))
+	      buffer[plen++] = '/';
+	    q = gnu_list_name->dir_contents;
+	    if (q)
+	      while (*q)
+		{
+		  size_t qlen = strlen (q);
+		  if (*q == 'Y')
+		    {
+		      if (buffer_size < plen + qlen)
+			{
+			  while ((buffer_size *=2 ) < plen + qlen)
+			    continue;
+			  buffer = xrealloc (buffer, buffer_size);
+			}
+		      strcpy (buffer + plen, q + 1);
+		      dump_file (buffer, -1, (dev_t) 0);
+		    }
+		  q += qlen + 1;
+		}
+	  }
+      free (buffer);
+    }
+  else
+    {
+      while (p = name_next (1), p)
+	if (!excluded_name (p))
+	  dump_file (p, 1, (dev_t) 0);
+    }
+
+  write_eot ();
+  close_archive ();
+
+  if (listed_incremental_option)
+    write_directory_file ();
+}
+
+
+/* Calculate the hash of a link.  */
+static unsigned
+hash_link (void const *entry, unsigned n_buckets)
+{
+  struct link const *link = entry;
+  return (uintmax_t) (link->dev ^ link->ino) % n_buckets;
+}
+
+/* Compare two links for equality.  */
+static bool
+compare_links (void const *entry1, void const *entry2)
+{
+  struct link const *link1 = entry1;
+  struct link const *link2 = entry2;
+  return ((link1->dev ^ link2->dev) | (link1->ino ^ link2->ino)) == 0;
+}
+
+/* Dump a single file, recursing on directories.  P is the file name
+   to dump.  TOP_LEVEL tells whether this is a top-level call; zero
+   means no, positive means yes, and negative means an incremental
+   dump.  PARENT_DEVICE is the device of P's
+   parent directory; it is examined only if TOP_LEVEL is zero.
+
+   Set global CURRENT_STAT to stat output for this file.  */
+
+/* FIXME: One should make sure that for *every* path leading to setting
+   exit_status to failure, a clear diagnostic has been issued.  */
+
+void
+dump_file (char *p, int top_level, dev_t parent_device)
+{
+  union block *header;
+  char type;
+  union block *exhdr;
+  char save_typeflag;
+  time_t original_ctime;
+  struct utimbuf restore_times;
+
+  /* FIXME: `header' might be used uninitialized in this
+     function.  Reported by Bruno Haible.  */
+
+  if (interactive_option && !confirm ("add", p))
+    return;
+
+  if (deref_stat (dereference_option, p, &current_stat) != 0)
+    {
+      if (ignore_failed_read_option)
+	stat_warn (p);
+      else
+	stat_error (p);
+      return;
+    }
+
+  original_ctime = current_stat.st_ctime;
+  restore_times.actime = current_stat.st_atime;
+  restore_times.modtime = current_stat.st_mtime;
+
+#ifdef S_ISHIDDEN
+  if (S_ISHIDDEN (current_stat.st_mode))
+    {
+      char *new = (char *) alloca (strlen (p) + 2);
+      if (new)
+	{
+	  strcpy (new, p);
+	  strcat (new, "@");
+	  p = new;
+	}
+    }
+#endif
+
+  /* See if we want only new files, and check if this one is too old to
+     put in the archive.  */
+
+  if ((0 < top_level || !incremental_option)
+      && !S_ISDIR (current_stat.st_mode)
+      && current_stat.st_mtime < newer_mtime_option
+      && (!after_date_option || current_stat.st_ctime < newer_ctime_option))
+    {
+      if (0 < top_level)
+	WARN ((0, 0, _("%s: file is unchanged; not dumped"),
+	       quotearg_colon (p)));
+      /* FIXME: recheck this return.  */
+      return;
+    }
+
+#if !MSDOS
+  /* See if we are trying to dump the archive.  */
+
+  if (ar_dev && current_stat.st_dev == ar_dev && current_stat.st_ino == ar_ino)
+    {
+      WARN ((0, 0, _("%s: file is the archive; not dumped"),
+	     quotearg_colon (p)));
+      return;
+    }
+#endif
+
+  if (S_ISDIR (current_stat.st_mode))
+    {
+      char *directory;
+      char const *entry;
+      size_t entrylen;
+      char *namebuf;
+      size_t buflen;
+      size_t len;
+      dev_t our_device = current_stat.st_dev;
+
+      errno = 0;
+
+      directory = savedir (p);
+      if (! directory)
+	{
+	  if (ignore_failed_read_option)
+	    savedir_warn (p);
+	  else
+	    savedir_error (p);
+	  return;
+	}
+
+      /* Build new prototype name.  Ensure exactly one trailing slash.  */
+
+      len = strlen (p);
+      buflen = len + NAME_FIELD_SIZE;
+      namebuf = xmalloc (buflen + 1);
+      memcpy (namebuf, p, len);
+      while (len >= 1 && ISSLASH (namebuf[len - 1]))
+	len--;
+      namebuf[len++] = '/';
+      namebuf[len] = '\0';
+
+      if (! is_avoided_name (namebuf))
+	{
+	  /* The condition above used to be "archive_format != V7_FORMAT".
+	     GNU tar was not writing directory blocks at all.  Daniel Trinkle
+	     writes: ``All old versions of tar I have ever seen have
+	     correctly archived an empty directory.  The really old ones I
+	     checked included HP-UX 7 and Mt. Xinu More/BSD.  There may be
+	     some subtle reason for the exclusion that I don't know, but the
+	     current behavior is broken.''  I do not know those subtle
+	     reasons either, so until these are reported (anew?), just allow
+	     directory blocks to be written even with old archives.  */
+
+	  current_stat.st_size = 0;	/* force 0 size on dir */
+
+	  /* FIXME: If people could really read standard archives, this
+	     should be:
+
+	     header
+	       = start_header (standard_option ? p : namebuf, &current_stat);
+
+	     but since they'd interpret DIRTYPE blocks as regular
+	     files, we'd better put the / on the name.  */
+
+	  header = start_header (namebuf, &current_stat);
+
+	  if (incremental_option)
+	    header->header.typeflag = GNUTYPE_DUMPDIR;
+	  else /* if (standard_option) */
+	    header->header.typeflag = DIRTYPE;
+
+	  /* If we're gnudumping, we aren't done yet so don't close it.  */
+
+	  if (!incremental_option)
+	    finish_header (header);	/* done with directory header */
+	}
+
+      if (incremental_option && gnu_list_name->dir_contents)
+	{
+	  off_t sizeleft;
+	  off_t totsize;
+	  size_t bufsize;
+	  union block *start;
+	  ssize_t count;
+	  const char *buffer, *p_buffer;
+
+	  buffer = gnu_list_name->dir_contents; /* FOO */
+	  totsize = 0;
+	  for (p_buffer = buffer; p_buffer && *p_buffer;)
+	    {
+	      size_t tmp;
+
+	      tmp = strlen (p_buffer) + 1;
+	      totsize += tmp;
+	      p_buffer += tmp;
+	    }
+	  totsize++;
+	  OFF_TO_CHARS (totsize, header->header.size);
+	  finish_header (header);
+	  p_buffer = buffer;
+	  sizeleft = totsize;
+	  while (sizeleft > 0)
+	    {
+	      if (multi_volume_option)
+		{
+		  assign_string (&save_name, p);
+		  save_sizeleft = sizeleft;
+		  save_totsize = totsize;
+		}
+	      start = find_next_block ();
+	      bufsize = available_space_after (start);
+	      if (sizeleft < bufsize)
+		{
+		  bufsize = sizeleft;
+		  count = bufsize % BLOCKSIZE;
+		  if (count)
+		    memset (start->buffer + sizeleft, 0, BLOCKSIZE - count);
+		}
+	      memcpy (start->buffer, p_buffer, bufsize);
+	      sizeleft -= bufsize;
+	      p_buffer += bufsize;
+	      set_next_block_after (start + (bufsize - 1) / BLOCKSIZE);
+	    }
+	  if (multi_volume_option)
+	    assign_string (&save_name, 0);
+	  goto finish_dir;
+	}
+
+      /* See if we are about to recurse into a directory, and avoid doing
+	 so if the user wants that we do not descend into directories.  */
+
+      if (! recursion_option)
+	goto finish_dir;
+
+      /* See if we are crossing from one file system to another, and
+	 avoid doing so if the user only wants to dump one file system.  */
+
+      if (one_file_system_option && !top_level
+	  && parent_device != current_stat.st_dev)
+	{
+	  if (verbose_option)
+	    WARN ((0, 0,
+		   _("%s: file is on a different filesystem; not dumped"),
+		   quotearg_colon (p)));
+	  goto finish_dir;
+	}
+
+      /* Now output all the files in the directory.  */
+
+      /* FIXME: Should speed this up by cd-ing into the dir.  */
+
+      for (entry = directory;
+	   (entrylen = strlen (entry)) != 0;
+	   entry += entrylen + 1)
+	{
+	  if (buflen <= len + entrylen)
+	    {
+	      buflen = len + entrylen;
+	      namebuf = xrealloc (namebuf, buflen + 1);
+	    }
+	  strcpy (namebuf + len, entry);
+	  if (!excluded_name (namebuf))
+	    dump_file (namebuf, 0, our_device);
+	}
+
+    finish_dir:
+
+      free (directory);
+      free (namebuf);
+      if (atime_preserve_option)
+	utime (p, &restore_times);
+      return;
+    }
+  else if (is_avoided_name (p))
+    return;
+  else
+    {
+      /* Check for multiple links.
+
+	 We maintain a table of all such files that we've written so
+	 far.  Any time we see another, we check the table and avoid
+	 dumping the data again if we've done it once already.  */
+
+      if (1 < current_stat.st_nlink)
+	{
+	  static Hash_table *link_table;
+	  struct link *lp = xmalloc (offsetof (struct link, name)
+				     + strlen (p) + 1);
+	  struct link *dup;
+	  lp->ino = current_stat.st_ino;
+	  lp->dev = current_stat.st_dev;
+	  strcpy (lp->name, p);
+
+	  if (! ((link_table
+		  || (link_table = hash_initialize (0, 0, hash_link,
+						    compare_links, 0)))
+		 && (dup = hash_insert (link_table, lp))))
+	    xalloc_die ();
+
+	  if (dup != lp)
+	    {
+	      /* We found a link.  */
+	      char const *link_name = relativize (dup->name);
+
+	      free (lp);
+
+	      if (NAME_FIELD_SIZE <= strlen (link_name))
+		write_long (link_name, GNUTYPE_LONGLINK);
+	      assign_string (&current_link_name, link_name);
+
+	      current_stat.st_size = 0;
+	      header = start_header (p, &current_stat);
+	      strncpy (header->header.linkname, link_name, NAME_FIELD_SIZE);
+
+	      /* Force null termination.  */
+	      header->header.linkname[NAME_FIELD_SIZE - 1] = 0;
+
+	      header->header.typeflag = LNKTYPE;
+	      finish_header (header);
+
+	      /* FIXME: Maybe remove from table after all links found?  */
+
+	      if (remove_files_option && unlink (p) != 0)
+		unlink_error (p);
+
+	      /* We dumped it.  */
+	      return;
+	    }
+	}
+
+      /* This is not a link to a previously dumped file, so dump it.  */
+
+      if (S_ISREG (current_stat.st_mode)
+	  || S_ISCTG (current_stat.st_mode))
+	{
+	  int f;			/* file descriptor */
+	  size_t bufsize;
+	  ssize_t count;
+	  off_t sizeleft;
+	  union block *start;
+	  int header_moved;
+	  char isextended = 0;
+	  int sparses = 0;
+
+	  header_moved = 0;
+
+	  if (sparse_option)
+	    {
+	      /* Check the size of the file against the number of blocks
+		 allocated for it, counting both data and indirect blocks.
+		 If there is a smaller number of blocks that would be
+		 necessary to accommodate a file of this size, this is safe
+		 to say that we have a sparse file: at least one of those
+		 blocks in the file is just a useless hole.  For sparse
+		 files not having more hole blocks than indirect blocks, the
+		 sparseness will go undetected.  */
+
+	      /* Bruno Haible sent me these statistics for Linux.  It seems
+		 that some filesystems count indirect blocks in st_blocks,
+		 while others do not seem to:
+
+		 minix-fs   tar: size=7205, st_blocks=18 and ST_NBLOCKS=18
+		 extfs      tar: size=7205, st_blocks=18 and ST_NBLOCKS=18
+		 ext2fs     tar: size=7205, st_blocks=16 and ST_NBLOCKS=16
+		 msdos-fs   tar: size=7205, st_blocks=16 and ST_NBLOCKS=16
+
+		 Dick Streefland reports the previous numbers as misleading,
+		 because ext2fs use 12 direct blocks, while minix-fs uses only
+		 6 direct blocks.  Dick gets:
+
+		 ext2	size=20480	ls listed blocks=21
+		 minix	size=20480	ls listed blocks=21
+		 msdos	size=20480	ls listed blocks=20
+
+		 It seems that indirect blocks *are* included in st_blocks.
+		 The minix filesystem does not account for phantom blocks in
+		 st_blocks, so `du' and `ls -s' give wrong results.  So, the
+		 --sparse option would not work on a minix filesystem.  */
+
+	      if (ST_NBLOCKS (current_stat)
+		  < (current_stat.st_size / ST_NBLOCKSIZE
+		     + (current_stat.st_size % ST_NBLOCKSIZE != 0)))
+		{
+		  int counter;
+
+		  header = start_header (p, &current_stat);
+		  header->header.typeflag = GNUTYPE_SPARSE;
+		  header_moved = 1;
+
+		  /* Call the routine that figures out the layout of the
+		     sparse file in question.  SPARSES is the index of the
+		     first unused element of the "sparsearray," i.e.,
+		     the number of elements it needed to describe the file.  */
+
+		  sparses = deal_with_sparse (p, header);
+
+		  /* See if we'll need an extended header later.  */
+
+		  if (SPARSES_IN_OLDGNU_HEADER < sparses)
+		    header->oldgnu_header.isextended = 1;
+
+		  /* We store the "real" file size so we can show that in
+		     case someone wants to list the archive, i.e., tar tvf
+		     <file>.  It might be kind of disconcerting if the
+		     shrunken file size was the one that showed up.  */
+
+		  OFF_TO_CHARS (current_stat.st_size,
+				header->oldgnu_header.realsize);
+
+		  /* This will be the new "size" of the file, i.e., the size
+		     of the file minus the blocks of holes that we're
+		     skipping over.  */
+
+		  current_stat.st_size = find_new_file_size (sparses);
+		  OFF_TO_CHARS (current_stat.st_size, header->header.size);
+
+		  for (counter = 0;
+		       counter < sparses && counter < SPARSES_IN_OLDGNU_HEADER;
+		       counter++)
+		    {
+		      OFF_TO_CHARS (sparsearray[counter].offset,
+				    header->oldgnu_header.sp[counter].offset);
+		      SIZE_TO_CHARS (sparsearray[counter].numbytes,
+				     header->oldgnu_header.sp[counter].numbytes);
+		    }
+		}
+	    }
+
+	  sizeleft = current_stat.st_size;
+
+	  /* Don't bother opening empty, world readable files.  Also do not open
+	     files when archive is meant for /dev/null.  */
+
+	  if (dev_null_output
+	      || (sizeleft == 0
+		  && MODE_R == (MODE_R & current_stat.st_mode)))
+	    f = -1;
+	  else
+	    {
+	      f = open (p, O_RDONLY | O_BINARY);
+	      if (f < 0)
+		{
+		  if (! top_level && errno == ENOENT)
+		    WARN ((0, 0, _("%s: File removed before we read it"),
+			   quotearg_colon (p)));
+		  else
+		    (ignore_failed_read_option ? open_warn : open_error) (p);
+		  return;
+		}
+	    }
+
+	  /* If the file is sparse, we've already taken care of this.  */
+
+	  if (!header_moved)
+	    header = start_header (p, &current_stat);
+
+	  /* Mark contiguous files, if we support them.  */
+
+	  if (archive_format != V7_FORMAT && S_ISCTG (current_stat.st_mode))
+	    header->header.typeflag = CONTTYPE;
+
+	  isextended = header->oldgnu_header.isextended;
+	  save_typeflag = header->header.typeflag;
+	  finish_header (header);
+	  if (isextended)
+	    {
+	      int sparses_emitted = SPARSES_IN_OLDGNU_HEADER;
+
+	      for (;;)
+		{
+		  int i;
+		  exhdr = find_next_block ();
+		  memset (exhdr->buffer, 0, BLOCKSIZE);
+		  for (i = 0;
+		       (i < SPARSES_IN_SPARSE_HEADER
+			&& sparses_emitted + i < sparses);
+		       i++)
+		    {
+		      SIZE_TO_CHARS (sparsearray[sparses_emitted + i].numbytes,
+				     exhdr->sparse_header.sp[i].numbytes);
+		      OFF_TO_CHARS (sparsearray[sparses_emitted + i].offset,
+				    exhdr->sparse_header.sp[i].offset);
+		    }
+		  set_next_block_after (exhdr);
+		  sparses_emitted += i;
+		  if (sparses == sparses_emitted)
+		    break;
+		  exhdr->sparse_header.isextended = 1;
+		}
+	    }
+	  if (save_typeflag == GNUTYPE_SPARSE)
+	    {
+	      if (f < 0
+		  || finish_sparse_file (f, &sizeleft,
+					 current_stat.st_size, p))
+		goto padit;
+	    }
+	  else
+	    while (sizeleft > 0)
+	      {
+		if (multi_volume_option)
+		  {
+		    assign_string (&save_name, p);
+		    save_sizeleft = sizeleft;
+		    save_totsize = current_stat.st_size;
+		  }
+		start = find_next_block ();
+
+		bufsize = available_space_after (start);
+
+		if (sizeleft < bufsize)
+		  {
+		    /* Last read -- zero out area beyond.  */
+
+		    bufsize = sizeleft;
+		    count = bufsize % BLOCKSIZE;
+		    if (count)
+		      memset (start->buffer + sizeleft, 0, BLOCKSIZE - count);
+		  }
+		if (f < 0)
+		  count = bufsize;
+		else
+		  count = safe_read (f, start->buffer, bufsize);
+		if (count < 0)
+		  {
+		    (ignore_failed_read_option
+		     ? read_warn_details
+		     : read_error_details)
+		      (p, current_stat.st_size - sizeleft, bufsize);
+		    goto padit;
+		  }
+		sizeleft -= bufsize;
+
+		/* This is nonportable (the type of set_next_block_after's arg).  */
+
+		set_next_block_after (start + (bufsize - 1) / BLOCKSIZE);
+
+
+		if (count != bufsize)
+		  {
+		    char buf[UINTMAX_STRSIZE_BOUND];
+		    memset (start->buffer + count, 0, bufsize - count);
+		    WARN ((0, 0,
+			   _("%s: File shrank by %s bytes; padding with zeros"),
+			   quotearg_colon (p),
+			   STRINGIFY_BIGINT (sizeleft, buf)));
+		    if (! ignore_failed_read_option)
+		      exit_status = TAREXIT_FAILURE;
+		    goto padit;		/* short read */
+		  }
+	      }
+
+	  if (multi_volume_option)
+	    assign_string (&save_name, 0);
+
+	  if (f >= 0)
+	    {
+	      struct stat final_stat;
+	      if (fstat (f, &final_stat) != 0)
+		{
+		  if (ignore_failed_read_option)
+		    stat_warn (p);
+		  else
+		    stat_error (p);
+		}
+	      else if (final_stat.st_ctime != original_ctime)
+		{
+		  char const *qp = quotearg_colon (p);
+		  WARN ((0, 0, _("%s: file changed as we read it"), qp));
+		  if (! ignore_failed_read_option)
+		    exit_status = TAREXIT_FAILURE;
+		}
+	      if (close (f) != 0)
+		{
+		  if (ignore_failed_read_option)
+		    close_warn (p);
+		  else
+		    close_error (p);
+		}
+	      if (atime_preserve_option)
+		utime (p, &restore_times);
+	    }
+	  if (remove_files_option)
+	    {
+	      if (unlink (p) == -1)
+		unlink_error (p);
+	    }
+	  return;
+
+	  /* File shrunk or gave error, pad out tape to match the size we
+	     specified in the header.  */
+
+	padit:
+	  while (sizeleft > 0)
+	    {
+	      save_sizeleft = sizeleft;
+	      start = find_next_block ();
+	      memset (start->buffer, 0, BLOCKSIZE);
+	      set_next_block_after (start);
+	      sizeleft -= BLOCKSIZE;
+	    }
+	  if (multi_volume_option)
+	    assign_string (&save_name, 0);
+	  if (f >= 0)
+	    {
+	      close (f);
+	      if (atime_preserve_option)
+		utime (p, &restore_times);
+	    }
+	  return;
+	}
+#ifdef HAVE_READLINK
+      else if (S_ISLNK (current_stat.st_mode))
+	{
+	  char *buffer;
+	  int size;
+	  size_t linklen = current_stat.st_size;
+	  if (linklen != current_stat.st_size || linklen + 1 == 0)
+	    xalloc_die ();
+	  buffer = (char *) alloca (linklen + 1);
+	  size = readlink (p, buffer, linklen + 1);
+	  if (size < 0)
+	    {
+	      if (ignore_failed_read_option)
+		readlink_warn (p);
+	      else
+		readlink_error (p);
+	      return;
+	    }
+	  buffer[size] = '\0';
+	  if (size >= NAME_FIELD_SIZE)
+	    write_long (buffer, GNUTYPE_LONGLINK);
+	  assign_string (&current_link_name, buffer);
+
+	  current_stat.st_size = 0;	/* force 0 size on symlink */
+	  header = start_header (p, &current_stat);
+	  strncpy (header->header.linkname, buffer, NAME_FIELD_SIZE);
+	  header->header.linkname[NAME_FIELD_SIZE - 1] = '\0';
+	  header->header.typeflag = SYMTYPE;
+	  finish_header (header);	/* nothing more to do to it */
+	  if (remove_files_option)
+	    {
+	      if (unlink (p) == -1)
+		unlink_error (p);
+	    }
+	  return;
+	}
+#endif
+      else if (S_ISCHR (current_stat.st_mode))
+	type = CHRTYPE;
+      else if (S_ISBLK (current_stat.st_mode))
+	type = BLKTYPE;
+      else if (S_ISFIFO (current_stat.st_mode))
+	type = FIFOTYPE;
+      else if (S_ISSOCK (current_stat.st_mode))
+	{
+	  WARN ((0, 0, _("%s: socket ignored"), quotearg_colon (p)));
+	  return;
+	}
+      else if (S_ISDOOR (current_stat.st_mode))
+	{
+	  WARN ((0, 0, _("%s: door ignored"), quotearg_colon (p)));
+	  return;
+	}
+      else
+	goto unknown;
+    }
+
+  if (archive_format == V7_FORMAT)
+    goto unknown;
+
+  current_stat.st_size = 0;	/* force 0 size */
+  header = start_header (p, &current_stat);
+  header->header.typeflag = type;
+
+  if (type != FIFOTYPE)
+    {
+      MAJOR_TO_CHARS (major (current_stat.st_rdev), header->header.devmajor);
+      MINOR_TO_CHARS (minor (current_stat.st_rdev), header->header.devminor);
+    }
+
+  finish_header (header);
+  if (remove_files_option)
+    {
+      if (unlink (p) == -1)
+	unlink_error (p);
+    }
+  return;
+
+unknown:
+  WARN ((0, 0, _("%s: Unknown file type; file ignored"),
+	 quotearg_colon (p)));
+  if (! ignore_failed_read_option)
+    exit_status = TAREXIT_FAILURE;
+}