Dogcows Code - chaz/tar/blob - src/mangle.c

   1 /* Encode long filenames for GNU tar.
   2    Copyright 1988, 1992, 1994, 1996, 1997, 1999 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify it
   5    under the terms of the GNU General Public License as published by the
   6    Free Software Foundation; either version 2, or (at your option) any later
   7    version.
   8
   9    This program is distributed in the hope that it will be useful, but
  10    WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  12    Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License along
  15    with this program; if not, write to the Free Software Foundation, Inc.,
  16    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #include "system.h"
  19 #include "common.h"
  20
  21 struct mangled
  22   {
  23     struct mangled *next;
  24     int type;
  25     char mangled[NAME_FIELD_SIZE];
  26     char *linked_to;
  27     char normal[1];
  28   };
  29
  30 /*---------------------------------------------------------------------.
  31 | Extract a GNUTYPE_NAMES record contents.  It seems that such are not |
  32 | produced anymore by GNU tar, but we leave the reading code around    |
  33 | nevertheless, for salvaging old tapes.                               |
  34 `---------------------------------------------------------------------*/
  35
  36 void
  37 extract_mangle (void)
  38 {
  39   off_t size = current_stat.st_size;
  40   char *buffer = xmalloc ((size_t) (size + 1));
  41   char *copy = buffer;
  42   char *cursor = buffer;
  43
  44   if (size != (size_t) size || size == (size_t) -1)
  45     FATAL_ERROR ((0, 0, _("Memory exhausted")));
  46
  47   buffer[size] = '\0';
  48
  49   while (size > 0)
  50     {
  51       union block *block = find_next_block ();
  52       size_t available;
  53
  54       if (!block)
  55         {
  56           ERROR ((0, 0, _("Unexpected EOF in mangled names")));
  57           return;
  58         }
  59       available = available_space_after (block);
  60       if (available > size)
  61         available = size;
  62       memcpy (copy, block->buffer, available);
  63       copy += available;
  64       size -= available;
  65       set_next_block_after ((union block *) (block->buffer + available - 1));
  66     }
  67
  68   while (*cursor)
  69     {
  70       char *next_cursor;
  71       char *name;
  72       char *name_end;
  73
  74       next_cursor = strchr (cursor, '\n');
  75       *next_cursor++ = '\0';
  76
  77       if (!strncmp (cursor, "Rename ", 7))
  78         {
  79
  80           name = cursor + 7;
  81           name_end = strchr (name, ' ');
  82           while (strncmp (name_end, " to ", 4))
  83             {
  84               name_end++;
  85               name_end = strchr (name_end, ' ');
  86             }
  87           *name_end = '\0';
  88           if (next_cursor[-2] == '/')
  89             next_cursor[-2] = '\0';
  90           unquote_string (name_end + 4);
  91           if (rename (name, name_end + 4))
  92             ERROR ((0, errno, _("Cannot rename %s to %s"), name, name_end + 4));
  93           else if (verbose_option)
  94             WARN ((0, 0, _("Renamed %s to %s"), name, name_end + 4));
  95         }
  96 #ifdef HAVE_SYMLINK
  97       else if (!strncmp (cursor, "Symlink ", 8))
  98         {
  99           name = cursor + 8;
 100           name_end = strchr (name, ' ');
 101           while (strncmp (name_end, " to ", 4))
 102             {
 103               name_end++;
 104               name_end = strchr (name_end, ' ');
 105             }
 106           *name_end = '\0';
 107           unquote_string (name);
 108           unquote_string (name_end + 4);
 109           if (symlink (name, name_end + 4)
 110               && (unlink (name_end + 4) || symlink (name, name_end + 4)))
 111             ERROR ((0, errno, _("Cannot symlink %s to %s"),
 112                     name, name_end + 4));
 113           else if (verbose_option)
 114             WARN ((0, 0, _("Symlinked %s to %s"), name, name_end + 4));
 115         }
 116 #endif
 117       else
 118         ERROR ((0, 0, _("Unknown demangling command %s"), cursor));
 119
 120       cursor = next_cursor;
 121     }
 122 }