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[dragonfly.git] / contrib / cpio / copyin.c

/* copyin.c - extract or list a cpio archive
   Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc.

   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., 675 Mass Ave, Cambridge, MA 02139, USA.

$FreeBSD: src/contrib/cpio/copyin.c,v 1.6.6.1 2002/03/12 19:10:14 phantom Exp $
$DragonFly: src/contrib/cpio/copyin.c,v 1.2 2003/06/17 04:23:58 dillon Exp $
*/

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#if (defined(BSD) && (BSD >= 199306))
#define HAVE_STRFTIME
#include <ctype.h>
#endif
#include "filetypes.h"
#include "system.h"
#include "cpiohdr.h"
#include "dstring.h"
#include "extern.h"
#include "defer.h"
#include "rmt.h"
#ifndef FNM_PATHNAME
#include <fnmatch.h>
#endif
#if defined(HAVE_STRFTIME) && defined(__FreeBSD__)
#include <langinfo.h>
#endif

#ifndef HAVE_LCHOWN
#define lchown chown
#endif

static void read_pattern_file ();
static void tape_skip_padding ();
static void defer_copyin ();
static void create_defered_links ();
static void create_final_defers ();

/* Return 16-bit integer I with the bytes swapped.  */
#define swab_short(i) ((((i) << 8) & 0xff00) | (((i) >> 8) & 0x00ff))

/* Read the header, including the name of the file, from file
   descriptor IN_DES into FILE_HDR.  */

void
read_in_header (file_hdr, in_des)
     struct new_cpio_header *file_hdr;
     int in_des;
{
  long bytes_skipped = 0;       /* Bytes of junk found before magic number.  */

  /* Search for a valid magic number.  */

  if (archive_format == arf_unknown)
    {
      char tmpbuf[512];
      int check_tar;
      int peeked_bytes;

      while (archive_format == arf_unknown)
        {
          peeked_bytes = tape_buffered_peek (tmpbuf, in_des, 512);
          if (peeked_bytes < 6)
            error (1, 0, "premature end of archive");

          if (!strncmp (tmpbuf, "070701", 6))
            archive_format = arf_newascii;
          else if (!strncmp (tmpbuf, "070707", 6))
            archive_format = arf_oldascii;
          else if (!strncmp (tmpbuf, "070702", 6))
            {
              archive_format = arf_crcascii;
              crc_i_flag = TRUE;
            }
          else if ((*((unsigned short *) tmpbuf) == 070707) ||
                   (*((unsigned short *) tmpbuf) == swab_short ((unsigned short) 070707)))
            archive_format = arf_binary;
          else if (peeked_bytes >= 512
                   && (check_tar = is_tar_header (tmpbuf)))
            {
              if (check_tar == 2)
                archive_format = arf_ustar;
              else
                archive_format = arf_tar;
            }
          else
            {
              tape_buffered_read ((char *) tmpbuf, in_des, 1L);
              ++bytes_skipped;
            }
        }
    }

  if (archive_format == arf_tar || archive_format == arf_ustar)
    {
      if (append_flag)
        last_header_start = input_bytes - io_block_size +
          (in_buff - input_buffer);
      if (bytes_skipped > 0)
        error (0, 0, "warning: skipped %ld bytes of junk", bytes_skipped);
      read_in_tar_header (file_hdr, in_des);
      return;
    }

  file_hdr->c_tar_linkname = NULL;

  tape_buffered_read ((char *) file_hdr, in_des, 6L);
  while (1)
    {
      if (append_flag)
        last_header_start = input_bytes - io_block_size
          + (in_buff - input_buffer) - 6;
      if (archive_format == arf_newascii
          && !strncmp ((char *) file_hdr, "070701", 6))
        {
          if (bytes_skipped > 0)
            error (0, 0, "warning: skipped %ld bytes of junk", bytes_skipped);
          read_in_new_ascii (file_hdr, in_des);
          break;
        }
      if (archive_format == arf_crcascii
          && !strncmp ((char *) file_hdr, "070702", 6))
        {
          if (bytes_skipped > 0)
            error (0, 0, "warning: skipped %ld bytes of junk", bytes_skipped);
          read_in_new_ascii (file_hdr, in_des);
          break;
        }
      if ( (archive_format == arf_oldascii || archive_format == arf_hpoldascii)
          && !strncmp ((char *) file_hdr, "070707", 6))
        {
          if (bytes_skipped > 0)
            error (0, 0, "warning: skipped %ld bytes of junk", bytes_skipped);
          read_in_old_ascii (file_hdr, in_des);
          break;
        }
      if ( (archive_format == arf_binary || archive_format == arf_hpbinary)
          && (file_hdr->c_magic == 070707
              || file_hdr->c_magic == swab_short ((unsigned short) 070707)))
        {
          /* Having to skip 1 byte because of word alignment is normal.  */
          if (bytes_skipped > 0)
            error (0, 0, "warning: skipped %ld bytes of junk", bytes_skipped);
          read_in_binary (file_hdr, in_des);
          break;
        }
      bytes_skipped++;
      bcopy ((char *) file_hdr + 1, (char *) file_hdr, 5);
      tape_buffered_read ((char *) file_hdr + 5, in_des, 1L);
    }
}

/* Fill in FILE_HDR by reading an old-format ASCII format cpio header from
   file descriptor IN_DES, except for the magic number, which is
   already filled in.  */

void
read_in_old_ascii (file_hdr, in_des)
     struct new_cpio_header *file_hdr;
     int in_des;
{
  char ascii_header[78];
  unsigned long dev;
  unsigned long rdev;

  tape_buffered_read (ascii_header, in_des, 70L);
  ascii_header[70] = '\0';
  sscanf (ascii_header,
          "%6lo%6lo%6lo%6lo%6lo%6lo%6lo%11lo%6lo%11lo",
          &dev, &file_hdr->c_ino,
          &file_hdr->c_mode, &file_hdr->c_uid, &file_hdr->c_gid,
          &file_hdr->c_nlink, &rdev, &file_hdr->c_mtime,
          &file_hdr->c_namesize, &file_hdr->c_filesize);
  file_hdr->c_dev_maj = major (dev);
  file_hdr->c_dev_min = minor (dev);
  file_hdr->c_rdev_maj = major (rdev);
  file_hdr->c_rdev_min = minor (rdev);

  /* Read file name from input.  */
  if (file_hdr->c_name != NULL)
    free (file_hdr->c_name);
  file_hdr->c_name = (char *) xmalloc (file_hdr->c_namesize + 1);
  tape_buffered_read (file_hdr->c_name, in_des, (long) file_hdr->c_namesize);
#ifndef __MSDOS__
  /* HP/UX cpio creates archives that look just like ordinary archives,
     but for devices it sets major = 0, minor = 1, and puts the
     actual major/minor number in the filesize field.  See if this
     is an HP/UX cpio archive, and if so fix it.  We have to do this
     here because process_copy_in() assumes filesize is always 0
     for devices.  */
  switch (file_hdr->c_mode & CP_IFMT)
    {
      case CP_IFCHR:
      case CP_IFBLK:
#ifdef CP_IFSOCK
      case CP_IFSOCK:
#endif
#ifdef CP_IFIFO
      case CP_IFIFO:
#endif
        if (file_hdr->c_filesize != 0
            && file_hdr->c_rdev_maj == 0
            && file_hdr->c_rdev_min == 1)
          {
            file_hdr->c_rdev_maj = major (file_hdr->c_filesize);
            file_hdr->c_rdev_min = minor (file_hdr->c_filesize);
            file_hdr->c_filesize = 0;
          }
        break;
      default:
        break;
    }
#endif  /* __MSDOS__ */
}

/* Fill in FILE_HDR by reading a new-format ASCII format cpio header from
   file descriptor IN_DES, except for the magic number, which is
   already filled in.  */

void
read_in_new_ascii (file_hdr, in_des)
     struct new_cpio_header *file_hdr;
     int in_des;
{
  char ascii_header[112];

  tape_buffered_read (ascii_header, in_des, 104L);
  ascii_header[104] = '\0';
  sscanf (ascii_header,
          "%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx",
          &file_hdr->c_ino, &file_hdr->c_mode, &file_hdr->c_uid,
          &file_hdr->c_gid, &file_hdr->c_nlink, &file_hdr->c_mtime,
          &file_hdr->c_filesize, &file_hdr->c_dev_maj, &file_hdr->c_dev_min,
        &file_hdr->c_rdev_maj, &file_hdr->c_rdev_min, &file_hdr->c_namesize,
          &file_hdr->c_chksum);
  /* Read file name from input.  */
  if (file_hdr->c_name != NULL)
    free (file_hdr->c_name);
  file_hdr->c_name = (char *) xmalloc (file_hdr->c_namesize);
  tape_buffered_read (file_hdr->c_name, in_des, (long) file_hdr->c_namesize);

  /* In SVR4 ASCII format, the amount of space allocated for the header
     is rounded up to the next long-word, so we might need to drop
     1-3 bytes.  */
  tape_skip_padding (in_des, file_hdr->c_namesize + 110);
}

/* Fill in FILE_HDR by reading a binary format cpio header from
   file descriptor IN_DES, except for the first 6 bytes (the magic
   number, device, and inode number), which are already filled in.  */

void
read_in_binary (file_hdr, in_des)
     struct new_cpio_header *file_hdr;
     int in_des;
{
  struct old_cpio_header short_hdr;

  /* Copy the data into the short header, then later transfer
     it into the argument long header.  */
  short_hdr.c_dev = ((struct old_cpio_header *) file_hdr)->c_dev;
  short_hdr.c_ino = ((struct old_cpio_header *) file_hdr)->c_ino;
  tape_buffered_read (((char *) &short_hdr) + 6, in_des, 20L);

  /* If the magic number is byte swapped, fix the header.  */
  if (file_hdr->c_magic == swab_short ((unsigned short) 070707))
    {
      static int warned = 0;

      /* Alert the user that they might have to do byte swapping on
         the file contents.  */
      if (warned == 0)
        {
          error (0, 0, "warning: archive header has reverse byte-order");
          warned = 1;
        }
      swab_array ((char *) &short_hdr, 13);
    }

  file_hdr->c_dev_maj = major (short_hdr.c_dev);
  file_hdr->c_dev_min = minor (short_hdr.c_dev);
  file_hdr->c_ino = short_hdr.c_ino;
  file_hdr->c_mode = short_hdr.c_mode;
  file_hdr->c_uid = short_hdr.c_uid;
  file_hdr->c_gid = short_hdr.c_gid;
  file_hdr->c_nlink = short_hdr.c_nlink;
  file_hdr->c_rdev_maj = major (short_hdr.c_rdev);
  file_hdr->c_rdev_min = minor (short_hdr.c_rdev);
  file_hdr->c_mtime = (unsigned long) short_hdr.c_mtimes[0] << 16
    | short_hdr.c_mtimes[1];

  file_hdr->c_namesize = short_hdr.c_namesize;
  file_hdr->c_filesize = (unsigned long) short_hdr.c_filesizes[0] << 16
    | short_hdr.c_filesizes[1];

  /* Read file name from input.  */
  if (file_hdr->c_name != NULL)
    free (file_hdr->c_name);
  file_hdr->c_name = (char *) xmalloc (file_hdr->c_namesize);
  tape_buffered_read (file_hdr->c_name, in_des, (long) file_hdr->c_namesize);

  /* In binary mode, the amount of space allocated in the header for
     the filename is `c_namesize' rounded up to the next short-word,
     so we might need to drop a byte.  */
  if (file_hdr->c_namesize % 2)
    tape_toss_input (in_des, 1L);

#ifndef __MSDOS__
  /* HP/UX cpio creates archives that look just like ordinary archives,
     but for devices it sets major = 0, minor = 1, and puts the
     actual major/minor number in the filesize field.  See if this
     is an HP/UX cpio archive, and if so fix it.  We have to do this
     here because process_copy_in() assumes filesize is always 0
     for devices.  */
  switch (file_hdr->c_mode & CP_IFMT)
    {
      case CP_IFCHR:
      case CP_IFBLK:
#ifdef CP_IFSOCK
      case CP_IFSOCK:
#endif
#ifdef CP_IFIFO
      case CP_IFIFO:
#endif
        if (file_hdr->c_filesize != 0
            && file_hdr->c_rdev_maj == 0
            && file_hdr->c_rdev_min == 1)
          {
            file_hdr->c_rdev_maj = major (file_hdr->c_filesize);
            file_hdr->c_rdev_min = minor (file_hdr->c_filesize);
            file_hdr->c_filesize = 0;
          }
        break;
      default:
        break;
    }
#endif  /* __MSDOS__ */
}

/* Exchange the bytes of each element of the array of COUNT shorts
   starting at PTR.  */

void
swab_array (ptr, count)
     char *ptr;
     int count;
{
  char tmp;

  while (count-- > 0)
    {
      tmp = *ptr;
      *ptr = *(ptr + 1);
      ++ptr;
      *ptr = tmp;
      ++ptr;
    }
}

/* Current time for verbose table.  */
static time_t current_time;

/* Read the collection from standard input and create files
   in the file system.  */

void
process_copy_in ()
{
  char done = FALSE;            /* True if trailer reached.  */
  int res;                      /* Result of various function calls.  */
  dynamic_string new_name;      /* New file name for rename option.  */
  FILE *tty_in;                 /* Interactive file for rename option.  */
  FILE *tty_out;                /* Interactive file for rename option.  */
  FILE *rename_in;              /* Batch file for rename option.  */
  char *str_res;                /* Result for string function.  */
  struct utimbuf times;         /* For setting file times.  */
  struct stat file_stat;        /* Output file stat record.  */
  struct new_cpio_header file_hdr;      /* Output header information.  */
  int out_file_des;             /* Output file descriptor.  */
  int in_file_des;              /* Input file descriptor.  */
  char skip_file;               /* Flag for use with patterns.  */
  int existing_dir;             /* True if file is a dir & already exists.  */
  int i;                        /* Loop index variable.  */
  char *link_name = NULL;       /* Name of hard and symbolic links.  */
#ifdef HPUX_CDF
  int cdf_flag;                 /* True if file is a CDF.  */
  int cdf_char;                 /* Index of `+' char indicating a CDF.  */
#endif

  /* Initialize the copy in.  */
  if (pattern_file_name)
    read_pattern_file ();
  file_hdr.c_name = NULL;
  ds_init (&new_name, 128);
  /* Initialize this in case it has members we don't know to set.  */
  bzero (&times, sizeof (struct utimbuf));

  if (rename_batch_file)
    {
      rename_in = fopen (rename_batch_file, "r");
      if (rename_in == NULL)
        error (2, errno, CONSOLE);
    }
  else if (rename_flag)
    {
      /* Open interactive file pair for rename operation.  */
      tty_in = fopen (CONSOLE, "r");
      if (tty_in == NULL)
        error (2, errno, CONSOLE);
      tty_out = fopen (CONSOLE, "w");
      if (tty_out == NULL)
        error (2, errno, CONSOLE);
    }

  /* Get date and time if needed for processing the table option.  */
  if (table_flag && verbose_flag)
    time (&current_time);

#ifdef __MSDOS__
  setmode (archive_des, O_BINARY);
#endif
  /* Check whether the input file might be a tape.  */
  in_file_des = archive_des;
  if (_isrmt (in_file_des))
    {
      input_is_special = 1;
      input_is_seekable = 0;
    }
  else
    {
      if (fstat (in_file_des, &file_stat))
        error (1, errno, "standard input is closed");
      input_is_special =
#ifdef S_ISBLK
        S_ISBLK (file_stat.st_mode) ||
#endif
        S_ISCHR (file_stat.st_mode);
      input_is_seekable = S_ISREG (file_stat.st_mode);
    }
  output_is_seekable = TRUE;

  /* While there is more input in the collection, process the input.  */
  while (!done)
    {
      link_name = NULL;
      swapping_halfwords = swapping_bytes = FALSE;

      /* Start processing the next file by reading the header.  */
      read_in_header (&file_hdr, in_file_des);

#ifdef DEBUG_CPIO
      if (debug_flag)
        {
          struct new_cpio_header *h;
          h = &file_hdr;
          fprintf (stderr, 
                "magic = 0%o, ino = %d, mode = 0%o, uid = %d, gid = %d\n",
                h->c_magic, h->c_ino, h->c_mode, h->c_uid, h->c_gid);
          fprintf (stderr, 
                "nlink = %d, mtime = %d, filesize = %d, dev_maj = 0x%x\n",
                h->c_nlink, h->c_mtime, h->c_filesize, h->c_dev_maj);
          fprintf (stderr, 
                "dev_min = 0x%x, rdev_maj = 0x%x, rdev_min = 0x%x, namesize = %d\n",
                h->c_dev_min, h->c_rdev_maj, h->c_rdev_min, h->c_namesize);
          fprintf (stderr, 
                "chksum = %d, name = \"%s\", tar_linkname = \"%s\"\n",
                h->c_chksum, h->c_name, 
                h->c_tar_linkname ? h->c_tar_linkname : "(null)" );

        }
#endif
      /* Is this the header for the TRAILER file?  */
      if (strcmp ("TRAILER!!!", file_hdr.c_name) == 0)
        {
          done = TRUE;
          break;
        }

      /* Do we have to ignore absolute paths, and if so, does the filename
         have an absolute path?  */
      if (no_abs_paths_flag && file_hdr.c_name && file_hdr.c_name [0] == '/')
        {
          char *p;

          p = file_hdr.c_name;
          while (*p == '/')
            ++p;
          if (*p == '\0')
            {
              strcpy (file_hdr.c_name, ".");
            }
          else
            {
              char *non_abs_name;

              non_abs_name = (char *) xmalloc (strlen (p) + 1);
              strcpy (non_abs_name, p);
              free (file_hdr.c_name);
              file_hdr.c_name = non_abs_name;
            }
        }

      /* Does the file name match one of the given patterns?  */
      if (num_patterns <= 0)
        skip_file = FALSE;
      else
        {
          skip_file = copy_matching_files;
          for (i = 0; i < num_patterns
               && skip_file == copy_matching_files; i++)
            {
              if (fnmatch (save_patterns[i], file_hdr.c_name, 0) == 0)
                skip_file = !copy_matching_files;
            }
        }

      if (skip_file)
        {
          tape_toss_input (in_file_des, file_hdr.c_filesize);
          tape_skip_padding (in_file_des, file_hdr.c_filesize);
        }
      else if (table_flag)
        {
          if (verbose_flag)
            {
#ifdef CP_IFLNK
              if ((file_hdr.c_mode & CP_IFMT) == CP_IFLNK)
                {
                  if (archive_format != arf_tar && archive_format != arf_ustar)
                    {
                      link_name = (char *) xmalloc ((unsigned int) file_hdr.c_filesize + 1);
                      link_name[file_hdr.c_filesize] = '\0';
                      tape_buffered_read (link_name, in_file_des, file_hdr.c_filesize);
                      long_format (&file_hdr, link_name);
                      free (link_name);
                      tape_skip_padding (in_file_des, file_hdr.c_filesize);
                      continue;
                    }
                  else
                    {
                      long_format (&file_hdr, file_hdr.c_tar_linkname);
                      continue;
                    }
                }
              else
#endif
                long_format (&file_hdr, (char *) 0);
            }
          else
            printf ("%s\n", file_hdr.c_name);

          crc = 0;
          tape_toss_input (in_file_des, file_hdr.c_filesize);
          tape_skip_padding (in_file_des, file_hdr.c_filesize);
          if (only_verify_crc_flag)
            {
#ifdef CP_IFLNK
              if ((file_hdr.c_mode & CP_IFMT) == CP_IFLNK)
                continue;   /* links don't have a checksum */
#endif
              if (crc != file_hdr.c_chksum)
                error (0, 0, "%s: checksum error (0x%x, should be 0x%x)",
                       file_hdr.c_name, crc, file_hdr.c_chksum);
            }
        }
      else if (append_flag)
        {
          tape_toss_input (in_file_des, file_hdr.c_filesize);
          tape_skip_padding (in_file_des, file_hdr.c_filesize);
        }
      else if (only_verify_crc_flag)
        {
#ifdef CP_IFLNK
          if ((file_hdr.c_mode & CP_IFMT) == CP_IFLNK)
            {
              if (archive_format != arf_tar && archive_format != arf_ustar)
                {
                  tape_toss_input (in_file_des, file_hdr.c_filesize);
                  tape_skip_padding (in_file_des, file_hdr.c_filesize);
                  continue;
                }
            }
#endif
            crc = 0;
            tape_toss_input (in_file_des, file_hdr.c_filesize);
            tape_skip_padding (in_file_des, file_hdr.c_filesize);
            if (crc != file_hdr.c_chksum)
              error (0, 0, "%s: checksum error (0x%x, should be 0x%x)",
                     file_hdr.c_name, crc, file_hdr.c_chksum);
        }
      else
        {
          /* Copy the input file into the directory structure.  */

          /* Do we need to rename the file? */
          if (rename_flag || rename_batch_file)
            {
              if (rename_flag)
                {
                  fprintf (tty_out, "rename %s -> ", file_hdr.c_name);
                  fflush (tty_out);
                  str_res = ds_fgets (tty_in, &new_name);
                }
              else
                {
                  str_res = ds_fgetstr (rename_in, &new_name, '\n');
                }
              if (str_res == NULL || str_res[0] == 0)
                {
                  tape_toss_input (in_file_des, file_hdr.c_filesize);
                  tape_skip_padding (in_file_des, file_hdr.c_filesize);
                  continue;
                }
              else
                file_hdr.c_name = xstrdup (new_name.ds_string);
            }

          /* See if the file already exists.  */
          existing_dir = FALSE;
          if (lstat (file_hdr.c_name, &file_stat) == 0)
            {
              if (S_ISDIR (file_stat.st_mode)
                  && ((file_hdr.c_mode & CP_IFMT) == CP_IFDIR))
                {
                  /* If there is already a directory there that
                     we are trying to create, don't complain about
                     it.  */
                  existing_dir = TRUE;
                }
              else if (!unconditional_flag
                       && file_hdr.c_mtime <= file_stat.st_mtime)
                {
                  error (0, 0, "%s not created: newer or same age version exists",
                         file_hdr.c_name);
                  tape_toss_input (in_file_des, file_hdr.c_filesize);
                  tape_skip_padding (in_file_des, file_hdr.c_filesize);
                  continue;     /* Go to the next file.  */
                }
              else if (S_ISDIR (file_stat.st_mode) 
                        ? rmdir (file_hdr.c_name)
                        : unlink (file_hdr.c_name))
                {
                  error (0, errno, "cannot remove current %s",
                         file_hdr.c_name);
                  tape_toss_input (in_file_des, file_hdr.c_filesize);
                  tape_skip_padding (in_file_des, file_hdr.c_filesize);
                  continue;     /* Go to the next file.  */
                }
            }

          /* Do the real copy or link.  */
          switch (file_hdr.c_mode & CP_IFMT)
            {
            case CP_IFREG:
#ifndef __MSDOS__
              /* Can the current file be linked to a previously copied file? */
              if (file_hdr.c_nlink > 1 && (archive_format == arf_newascii
                  || archive_format == arf_crcascii) )
                {
                  int link_res;
                  if (file_hdr.c_filesize == 0)
                    {
                      /* The newc and crc formats store multiply linked copies
                         of the same file in the archive only once.  The
                         actual data is attached to the last link in the
                         archive, and the other links all have a filesize
                         of 0.  Since this file has multiple links and a
                         filesize of 0, its data is probably attatched to
                         another file in the archive.  Save the link, and
                         process it later when we get the actual data.  We
                         can't just create it with length 0 and add the
                         data later, in case the file is readonly.  We still
                         lose if its parent directory is readonly (and we aren't
                         running as root), but there's nothing we can do about
                         that.  */
                      defer_copyin (&file_hdr);
                      tape_toss_input (in_file_des, file_hdr.c_filesize);
                      tape_skip_padding (in_file_des, file_hdr.c_filesize);
                      break;
                    }
                  /* If the file has data (filesize != 0), then presumably
                     any other links have already been defer_copyin'ed(),
                     but GNU cpio version 2.0-2.2 didn't do that, so we
                     still have to check for links here (and also in case
                     the archive was created and later appeneded to). */
                  link_res = link_to_maj_min_ino (file_hdr.c_name, 
                                file_hdr.c_dev_maj, file_hdr.c_dev_maj,
                                file_hdr.c_ino);
                  if (link_res == 0)
                    {
                      tape_toss_input (in_file_des, file_hdr.c_filesize);
                      tape_skip_padding (in_file_des, file_hdr.c_filesize);
                      break;
                    }
                }
              else if (file_hdr.c_nlink > 1 && archive_format != arf_tar
                  && archive_format != arf_ustar)
                {
                  int link_res;
                  link_res = link_to_maj_min_ino (file_hdr.c_name, 
                                file_hdr.c_dev_maj, file_hdr.c_dev_maj,
                                file_hdr.c_ino);
                  if (link_res == 0)
                    {
                      tape_toss_input (in_file_des, file_hdr.c_filesize);
                      tape_skip_padding (in_file_des, file_hdr.c_filesize);
                      break;
                    }
                }
              else if ((archive_format == arf_tar || archive_format == arf_ustar)
                       && file_hdr.c_tar_linkname && 
                       file_hdr.c_tar_linkname[0] != '\0')
                {
                  int   link_res;
                  link_res = link_to_name (file_hdr.c_name,
                                           file_hdr.c_tar_linkname);
                  if (link_res < 0)
                    {
                      error (0, errno, "cannot link %s to %s",
                             file_hdr.c_tar_linkname, file_hdr.c_name);
                    }
                  break;
                }
#endif

              /* If not linked, copy the contents of the file.  */
              if (link_name == NULL)
                {
                  out_file_des = open (file_hdr.c_name,
                                       O_CREAT | O_WRONLY | O_BINARY, 0600);
                  if (out_file_des < 0 && create_dir_flag)
                    {
                      create_all_directories (file_hdr.c_name);
                      out_file_des = open (file_hdr.c_name,
                                           O_CREAT | O_WRONLY | O_BINARY,
                                           0600);
                    }
                  if (out_file_des < 0)
                    {
                      error (0, errno, "%s", file_hdr.c_name);
                      tape_toss_input (in_file_des, file_hdr.c_filesize);
                      tape_skip_padding (in_file_des, file_hdr.c_filesize);
                      continue;
                    }

                  crc = 0;
                  if (swap_halfwords_flag)
                    {
                      if ((file_hdr.c_filesize % 4) == 0)
                        swapping_halfwords = TRUE;
                      else
                        error (0, 0, "cannot swap halfwords of %s: odd number of halfwords",
                               file_hdr.c_name);
                    }
                  if (swap_bytes_flag)
                    {
                      if ((file_hdr.c_filesize % 2) == 0)
                        swapping_bytes = TRUE;
                      else
                        error (0, 0, "cannot swap bytes of %s: odd number of bytes",
                               file_hdr.c_name);
                    }
                  copy_files_tape_to_disk (in_file_des, out_file_des, file_hdr.c_filesize);
                  disk_empty_output_buffer (out_file_des);
                  if (close (out_file_des) < 0)
                    error (0, errno, "%s", file_hdr.c_name);

                  if (archive_format == arf_crcascii)
                    {
                      if (crc != file_hdr.c_chksum)
                        error (0, 0, "%s: checksum error (0x%x, should be 0x%x)",
                               file_hdr.c_name, crc, file_hdr.c_chksum);
                    }
                  /* File is now copied; set attributes.  */
                  if (!no_chown_flag)
                    if ((chown (file_hdr.c_name,
                                set_owner_flag ? set_owner : file_hdr.c_uid,
                           set_group_flag ? set_group : file_hdr.c_gid) < 0)
                        && errno != EPERM)
                      error (0, errno, "%s", file_hdr.c_name);
                  /* chown may have turned off some permissions we wanted. */
                  if (chmod (file_hdr.c_name, (int) file_hdr.c_mode) < 0)
                    error (0, errno, "%s", file_hdr.c_name);
                  if (retain_time_flag)
                    {
                      times.actime = times.modtime = file_hdr.c_mtime;
                      if (utime (file_hdr.c_name, &times) < 0)
                        error (0, errno, "%s", file_hdr.c_name);
                    }
                  tape_skip_padding (in_file_des, file_hdr.c_filesize);
                  if (file_hdr.c_nlink > 1 && (archive_format == arf_newascii
                      || archive_format == arf_crcascii) )
                    {
                      /* (see comment above for how the newc and crc formats 
                         store multiple links).  Now that we have the data 
                         for this file, create any other links to it which
                         we defered.  */
                      create_defered_links (&file_hdr);
                    }
                }
              break;

            case CP_IFDIR:
              /* Strip any trailing `/'s off the filename; tar puts
                 them on.  We might as well do it here in case anybody
                 else does too, since they cause strange things to happen.  */
              strip_trailing_slashes (file_hdr.c_name);

              /* Ignore the current directory.  It must already exist,
                 and we don't want to change its permission, ownership
                 or time.  */
              if (file_hdr.c_name[0] == '.' && file_hdr.c_name[1] == '\0')
                break;

#ifdef HPUX_CDF
              cdf_flag = 0;
#endif
              if (!existing_dir)

                {
#ifdef HPUX_CDF
                  /* If the directory name ends in a + and is SUID,
                     then it is a CDF.  Strip the trailing + from
                     the name before creating it.  */
                  cdf_char = strlen (file_hdr.c_name) - 1;
                  if ( (cdf_char > 0) &&
                       (file_hdr.c_mode & 04000) && 
                       (file_hdr.c_name [cdf_char] == '+') )
                    {
                      file_hdr.c_name [cdf_char] = '\0';
                      cdf_flag = 1;
                    }
#endif
                  res = mkdir (file_hdr.c_name, file_hdr.c_mode);
                }
              else
                res = 0;
              if (res < 0 && create_dir_flag)
                {
                  create_all_directories (file_hdr.c_name);
                  res = mkdir (file_hdr.c_name, file_hdr.c_mode);
                }
              if (res < 0)
                {
                  /* In some odd cases where the file_hdr.c_name includes `.',
                     the directory may have actually been created by
                     create_all_directories(), so the mkdir will fail
                     because the directory exists.  If that's the case,
                     don't complain about it.  */
                  if ( (errno != EEXIST) ||
                       (lstat (file_hdr.c_name, &file_stat) != 0) ||
                       !(S_ISDIR (file_stat.st_mode) ) )
                    {
                      error (0, errno, "%s", file_hdr.c_name);
                      continue;
                    }
                }
              if (!no_chown_flag)
                if ((chown (file_hdr.c_name,
                            set_owner_flag ? set_owner : file_hdr.c_uid,
                            set_group_flag ? set_group : file_hdr.c_gid) < 0)
                    && errno != EPERM)
                  error (0, errno, "%s", file_hdr.c_name);
              /* chown may have turned off some permissions we wanted. */
              if (chmod (file_hdr.c_name, (int) file_hdr.c_mode) < 0)
                error (0, errno, "%s", file_hdr.c_name);
#ifdef HPUX_CDF
              if (cdf_flag)
                /* Once we "hide" the directory with the chmod(),
                   we have to refer to it using name+ instead of name.  */
                file_hdr.c_name [cdf_char] = '+';
#endif
              if (retain_time_flag)
                {
                  times.actime = times.modtime = file_hdr.c_mtime;
                  if (utime (file_hdr.c_name, &times) < 0)
                    error (0, errno, "%s", file_hdr.c_name);
                }
              break;

#ifndef __MSDOS__
            case CP_IFCHR:
            case CP_IFBLK:
#ifdef CP_IFSOCK
            case CP_IFSOCK:
#endif
#ifdef CP_IFIFO
            case CP_IFIFO:
#endif
              if (file_hdr.c_nlink > 1 && archive_format != arf_tar
                  && archive_format != arf_ustar)
                {
                  int link_res;
                  link_res = link_to_maj_min_ino (file_hdr.c_name, 
                                file_hdr.c_dev_maj, file_hdr.c_dev_maj,
                                file_hdr.c_ino);
                  if (link_res == 0)
                    break;
                }
              else if (archive_format == arf_ustar &&
                       file_hdr.c_tar_linkname && 
                       file_hdr.c_tar_linkname [0] != '\0')
                {
                  int   link_res;
                  link_res = link_to_name (file_hdr.c_name,
                                           file_hdr.c_tar_linkname);
                  if (link_res < 0)
                    {
                      error (0, errno, "cannot link %s to %s",
                             file_hdr.c_tar_linkname, file_hdr.c_name);
                      /* Something must be wrong, because we couldn't
                         find the file to link to.  But can we assume
                         that the device maj/min numbers are correct
                         and fall through to the mknod?  It's probably
                         safer to just break, rather than possibly
                         creating a bogus device file.  */
                    }
                  break;
                }
              
#ifdef CP_IFIFO
              if ((file_hdr.c_mode & CP_IFMT) == CP_IFIFO)
                res = mkfifo (file_hdr.c_name, file_hdr.c_mode);
              else
#endif
                res = mknod (file_hdr.c_name, file_hdr.c_mode,
                      makedev (file_hdr.c_rdev_maj, file_hdr.c_rdev_min));
              if (res < 0 && create_dir_flag)
                {
                  create_all_directories (file_hdr.c_name);
#ifdef CP_IFIFO
                  if ((file_hdr.c_mode & CP_IFMT) == CP_IFIFO)
                    res = mkfifo (file_hdr.c_name, file_hdr.c_mode);
                  else
#endif
                    res = mknod (file_hdr.c_name, file_hdr.c_mode,
                                 makedev (file_hdr.c_rdev_maj,
                                          file_hdr.c_rdev_min));
                }
              if (res < 0)
                {
                  error (0, errno, "%s", file_hdr.c_name);
                  continue;
                }
              if (!no_chown_flag)
                if ((chown (file_hdr.c_name,
                            set_owner_flag ? set_owner : file_hdr.c_uid,
                            set_group_flag ? set_group : file_hdr.c_gid) < 0)
                    && errno != EPERM)
                  error (0, errno, "%s", file_hdr.c_name);
              /* chown may have turned off some permissions we wanted. */
              if (chmod (file_hdr.c_name, file_hdr.c_mode) < 0)
                error (0, errno, "%s", file_hdr.c_name);
              if (retain_time_flag)
                {
                  times.actime = times.modtime = file_hdr.c_mtime;
                  if (utime (file_hdr.c_name, &times) < 0)
                    error (0, errno, "%s", file_hdr.c_name);
                }
              break;
#endif

#ifdef CP_IFLNK
            case CP_IFLNK:
              {
                if (archive_format != arf_tar && archive_format != arf_ustar)
                  {
                    link_name = (char *) xmalloc ((unsigned int) file_hdr.c_filesize + 1);
                    link_name[file_hdr.c_filesize] = '\0';
                    tape_buffered_read (link_name, in_file_des, file_hdr.c_filesize);
                    tape_skip_padding (in_file_des, file_hdr.c_filesize);
                  }
                else
                  {
                    link_name = xstrdup (file_hdr.c_tar_linkname);
                  }

                res = UMASKED_SYMLINK (link_name, file_hdr.c_name,
                                       file_hdr.c_mode);
                if (res < 0 && create_dir_flag)
                  {
                    create_all_directories (file_hdr.c_name);
                    res = UMASKED_SYMLINK (link_name, file_hdr.c_name,
                                           file_hdr.c_mode);
                  }
                if (res < 0)
                  {
                    error (0, errno, "%s", file_hdr.c_name);
                    free (link_name);
                    link_name = NULL;
                    continue;
                  }
                if (!no_chown_flag)
                  if ((lchown (file_hdr.c_name,
                               set_owner_flag ? set_owner : file_hdr.c_uid,
                           set_group_flag ? set_group : file_hdr.c_gid) < 0)
                      && errno != EPERM)
                    error (0, errno, "%s", file_hdr.c_name);
                free (link_name);
                link_name = NULL;
              }
              break;
#endif

            default:
              error (0, 0, "%s: unknown file type", file_hdr.c_name);
              tape_toss_input (in_file_des, file_hdr.c_filesize);
              tape_skip_padding (in_file_des, file_hdr.c_filesize);
            }

          if (verbose_flag)
            fprintf (stderr, "%s\n", file_hdr.c_name);
          if (dot_flag)
            fputc ('.', stderr);
        }
    }

  if (dot_flag)
    fputc ('\n', stderr);

  if (append_flag)
    return;

  if (archive_format == arf_newascii || archive_format == arf_crcascii)
    create_final_defers ();
  if (!quiet_flag)
    {
      res = (input_bytes + io_block_size - 1) / io_block_size;
      if (res == 1)
        fprintf (stderr, "1 block\n");
      else
        fprintf (stderr, "%d blocks\n", res);
    }
}
\f
/* Print the file described by FILE_HDR in long format.
   If LINK_NAME is nonzero, it is the name of the file that
   this file is a symbolic link to.  */

void
long_format (file_hdr, link_name)
     struct new_cpio_header *file_hdr;
     char *link_name;
{
  char mbuf[11];
  char tbuf[40];
  time_t when;
  char *ptbuf;
#ifdef HAVE_STRFTIME
  static int d_first = -1;
#endif

  mode_string (file_hdr->c_mode, mbuf);
  mbuf[10] = '\0';

  /* Get time values ready to print.  */
  when = file_hdr->c_mtime;
#ifdef HAVE_STRFTIME
#ifdef __FreeBSD__
  if (d_first < 0)
        d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
#else
  d_first = 0;
#endif
  if (current_time - when > 6L * 30L * 24L * 60L * 60L
      || current_time - when < 0L)
        ptbuf = d_first ? "%e %b  %Y" : "%b %e  %Y";
  else
        ptbuf = d_first ? "%e %b %R" : "%b %e %R";
  strftime(tbuf, sizeof(tbuf), ptbuf, localtime(&when));
  ptbuf = tbuf;
#else
  strcpy (tbuf, ctime (&when));
  if (current_time - when > 6L * 30L * 24L * 60L * 60L
      || current_time - when < 0L)
    {
      /* The file is older than 6 months, or in the future.
         Show the year instead of the time of day.  */
      strcpy (tbuf + 11, tbuf + 19);
    }
  tbuf[16] = '\0';
  ptbuf = tbuf + 4;
#endif

  printf ("%s %3lu ", mbuf, file_hdr->c_nlink);

#ifndef __MSDOS__
  if (numeric_uid)
#endif
    printf ("%-8u %-8u ", (unsigned int) file_hdr->c_uid,
            (unsigned int) file_hdr->c_gid);
#ifndef __MSDOS__
  else
    printf ("%-8.8s %-8.8s ", getuser (file_hdr->c_uid),
            getgroup (file_hdr->c_gid));

  if ((file_hdr->c_mode & CP_IFMT) == CP_IFCHR
      || (file_hdr->c_mode & CP_IFMT) == CP_IFBLK)
    printf ("%3lu, %3lu ", file_hdr->c_rdev_maj, file_hdr->c_rdev_min);
  else
#endif
    printf ("%8lu ", file_hdr->c_filesize);

  printf ("%s ", ptbuf);

  print_name_with_quoting (file_hdr->c_name);
  if (link_name)
    {
      printf (" -> ");
      print_name_with_quoting (link_name);
    }
  putc ('\n', stdout);
}

void
print_name_with_quoting (p)
     register char *p;
{
  register unsigned char c;

  while ( (c = *p++) )
    {
      switch (c)
        {
#ifndef __MSDOS__
        case '\\':
          printf ("\\\\");
          break;
#endif

        case '\n':
          printf ("\\n");
          break;

        case '\b':
          printf ("\\b");
          break;

        case '\r':
          printf ("\\r");
          break;

        case '\t':
          printf ("\\t");
          break;

        case '\f':
          printf ("\\f");
          break;

        case ' ':
          printf ("\\ ");
          break;

        case '"':
          printf ("\\\"");
          break;

        default:
#if (defined(BSD) && (BSD >= 199306))
          if (isprint(c))
#else
          if (c > 040 &&
#ifdef __MSDOS__
              c < 0377 && c != 0177
#else
              c < 0177
#endif
            )
#endif
            putchar (c);
          else
            printf ("\\%03o", (unsigned int) c);
        }
    }
}

/* Read a pattern file (for the -E option).  Put a list of
   `num_patterns' elements in `save_patterns'.  Any patterns that were
   already in `save_patterns' (from the command line) are preserved.  */

static void
read_pattern_file ()
{
  int max_new_patterns;
  char **new_save_patterns;
  int new_num_patterns;
  int i;
  dynamic_string pattern_name;
  FILE *pattern_fp;

  if (num_patterns < 0)
    num_patterns = 0;
  max_new_patterns = 1 + num_patterns;
  new_save_patterns = (char **) xmalloc (max_new_patterns * sizeof (char *));
  new_num_patterns = num_patterns;
  ds_init (&pattern_name, 128);

  pattern_fp = fopen (pattern_file_name, "r");
  if (pattern_fp == NULL)
    error (1, errno, "%s", pattern_file_name);
  while (ds_fgetstr (pattern_fp, &pattern_name, '\n') != NULL)
    {
      if (new_num_patterns >= max_new_patterns)
        {
          max_new_patterns += 1;
          new_save_patterns = (char **)
            xrealloc ((char *) new_save_patterns,
                      max_new_patterns * sizeof (char *));
        }
      new_save_patterns[new_num_patterns] = xstrdup (pattern_name.ds_string);
      ++new_num_patterns;
    }
  if (ferror (pattern_fp) || fclose (pattern_fp) == EOF)
    error (1, errno, "%s", pattern_file_name);

  for (i = 0; i < num_patterns; ++i)
    new_save_patterns[i] = save_patterns[i];

  save_patterns = new_save_patterns;
  num_patterns = new_num_patterns;
}

/* Skip the padding on IN_FILE_DES after a header or file,
   up to the next header.
   The number of bytes skipped is based on OFFSET -- the current offset
   from the last start of a header (or file) -- and the current
   header type.  */

static void
tape_skip_padding (in_file_des, offset)
     int in_file_des;
     int offset;
{
  int pad;

  if (archive_format == arf_crcascii || archive_format == arf_newascii)
    pad = (4 - (offset % 4)) % 4;
  else if (archive_format == arf_binary || archive_format == arf_hpbinary)
    pad = (2 - (offset % 2)) % 2;
  else if (archive_format == arf_tar || archive_format == arf_ustar)
    pad = (512 - (offset % 512)) % 512;
  else
    pad = 0;

  if (pad != 0)
    tape_toss_input (in_file_des, pad);
}


/* The newc and crc formats store multiply linked copies of the same file 
   in the archive only once.  The actual data is attached to the last link 
   in the archive, and the other links all have a filesize of 0.  When a 
   file in the archive has multiple links and a filesize of 0, its data is 
   probably "attatched" to another file in the archive, so we can't create
   it right away.  We have to "defer" creating it until we have created
   the file that has the data "attatched" to it.  We keep a list of the
   "defered" links on deferments.  */

struct deferment *deferments = NULL;

/* Add a file header to the deferments list.  For now they all just
   go on one list, although we could optimize this if necessary.  */

static void
defer_copyin (file_hdr)
  struct new_cpio_header *file_hdr;
{
  struct deferment *d;
  d = create_deferment (file_hdr);
  d->next = deferments;
  deferments = d;
  return;
}

/* We just created a file that (probably) has some other links to it
   which have been defered.  Go through all of the links on the deferments
   list and create any which are links to this file.  */

static void
create_defered_links (file_hdr)
  struct new_cpio_header *file_hdr;
{
  struct deferment *d;
  struct deferment *d_prev;
  int   ino;
  int   maj;
  int   min;
  int   link_res;
  ino = file_hdr->c_ino;
  maj = file_hdr->c_dev_maj;
  min = file_hdr->c_dev_min;
  d = deferments;
  d_prev = NULL;
  while (d != NULL)
    {
      if ( (d->header.c_ino == ino) && (d->header.c_dev_maj == maj)
          && (d->header.c_dev_min == min) )
        {
          struct deferment *d_free;
          link_res = link_to_name (d->header.c_name, file_hdr->c_name);
          if (link_res < 0)
            {
              error (0, errno, "cannot link %s to %s",
                     d->header.c_name, file_hdr->c_name);
            }
          if (d_prev != NULL)
            d_prev->next = d->next;
          else
            deferments = d->next;
          d_free = d;
          d = d->next;
          free_deferment (d_free);
        }
      else
        {
          d_prev = d;
          d = d->next;
        }
    }
}

/* If we had a multiply linked file that really was empty then we would
   have defered all of its links, since we never found any with data
   "attached", and they will still be on the deferment list even when
   we are done reading the whole archive.  Write out all of these
   empty links that are still on the deferments list.  */

static void
create_final_defers ()
{
  struct deferment *d;
  int   link_res;
  int   out_file_des;
  struct utimbuf times;         /* For setting file times.  */
  /* Initialize this in case it has members we don't know to set.  */
  bzero (&times, sizeof (struct utimbuf));
  
  for (d = deferments; d != NULL; d = d->next)
    {
      link_res = link_to_maj_min_ino (d->header.c_name, 
                    d->header.c_dev_maj, d->header.c_dev_maj,
                    d->header.c_ino);
      if (link_res == 0)
        {
          continue;
        }
      out_file_des = open (d->header.c_name,
                           O_CREAT | O_WRONLY | O_BINARY, 0600);
      if (out_file_des < 0 && create_dir_flag)
        {
          create_all_directories (d->header.c_name);
          out_file_des = open (d->header.c_name,
                               O_CREAT | O_WRONLY | O_BINARY,
                               0600);
        }
      if (out_file_des < 0)
        {
          error (0, errno, "%s", d->header.c_name);
          continue;
        }

      if (close (out_file_des) < 0)
        error (0, errno, "%s", d->header.c_name);

      /* File is now copied; set attributes.  */
      if (!no_chown_flag)
        if ((chown (d->header.c_name,
                    set_owner_flag ? set_owner : d->header.c_uid,
               set_group_flag ? set_group : d->header.c_gid) < 0)
            && errno != EPERM)
          error (0, errno, "%s", d->header.c_name);
      /* chown may have turned off some permissions we wanted. */
      if (chmod (d->header.c_name, (int) d->header.c_mode) < 0)
        error (0, errno, "%s", d->header.c_name);
      if (retain_time_flag)
        {
          times.actime = times.modtime = d->header.c_mtime;
          if (utime (d->header.c_name, &times) < 0)
            error (0, errno, "%s", d->header.c_name);
        }
    }
}