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
  20 #include <time.h>
  21 #ifndef time
  22 time_t time ();
  23 #endif
  24
  25 #include "common.h"
  26
  27 struct mangled
  28   {
  29     struct mangled *next;
  30     int type;
  31     char mangled[NAME_FIELD_SIZE];
  32     char *linked_to;
  33     char normal[1];
  34   };
  35
  36 /*---------------------------------------------------------------------.
  37 | Extract a GNUTYPE_NAMES record contents.  It seems that such are not |
  38 | produced anymore by GNU tar, but we leave the reading code around    |
  39 | nevertheless, for salvaging old tapes.                               |
  40 `---------------------------------------------------------------------*/
  41
  42 void
  43 extract_mangle (void)
  44 {
  45   off_t size = current_stat.st_size;
  46   char *buffer = xmalloc ((size_t) (size + 1));
  47   char *copy = buffer;
  48   char *cursor = buffer;
  49
  50   if (size != (size_t) size || size == (size_t) -1)
  51     FATAL_ERROR ((0, 0, _("Memory exhausted")));
  52
  53   buffer[size] = '\0';
  54
  55   while (size > 0)
  56     {
  57       union block *block = find_next_block ();
  58       size_t available;
  59
  60       if (!block)
  61         {
  62           ERROR ((0, 0, _("Unexpected EOF in mangled names")));
  63           return;
  64         }
  65       available = available_space_after (block);
  66       if (available > size)
  67         available = size;
  68       memcpy (copy, block->buffer, available);
  69       copy += available;
  70       size -= available;
  71       set_next_block_after ((union block *) (block->buffer + available - 1));
  72     }
  73
  74   while (*cursor)
  75     {
  76       char *next_cursor;
  77       char *name;
  78       char *name_end;
  79
  80       next_cursor = strchr (cursor, '\n');
  81       *next_cursor++ = '\0';
  82
  83       if (!strncmp (cursor, "Rename ", 7))
  84         {
  85
  86           name = cursor + 7;
  87           name_end = strchr (name, ' ');
  88           while (strncmp (name_end, " to ", 4))
  89             {
  90               name_end++;
  91               name_end = strchr (name_end, ' ');
  92             }
  93           *name_end = '\0';
  94           if (next_cursor[-2] == '/')
  95             next_cursor[-2] = '\0';
  96           unquote_string (name_end + 4);
  97           if (rename (name, name_end + 4))
  98             ERROR ((0, errno, _("Cannot rename %s to %s"), name, name_end + 4));
  99           else if (verbose_option)
 100             WARN ((0, 0, _("Renamed %s to %s"), name, name_end + 4));
 101         }
 102 #ifdef HAVE_SYMLINK
 103       else if (!strncmp (cursor, "Symlink ", 8))
 104         {
 105           name = cursor + 8;
 106           name_end = strchr (name, ' ');
 107           while (strncmp (name_end, " to ", 4))
 108             {
 109               name_end++;
 110               name_end = strchr (name_end, ' ');
 111             }
 112           *name_end = '\0';
 113           unquote_string (name);
 114           unquote_string (name_end + 4);
 115           if (symlink (name, name_end + 4)
 116               && (unlink (name_end + 4) || symlink (name, name_end + 4)))
 117             ERROR ((0, errno, _("Cannot symlink %s to %s"),
 118                     name, name_end + 4));
 119           else if (verbose_option)
 120             WARN ((0, 0, _("Symlinked %s to %s"), name, name_end + 4));
 121         }
 122 #endif
 123       else
 124         ERROR ((0, 0, _("Unknown demangling command %s"), cursor));
 125
 126       cursor = next_cursor;
 127     }
 128 }