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

   1 /* Encode long filenames for GNU tar.
   2    Copyright (C) 1988, 1992, 1994, 1996, 1997 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 time_t time ();
  22
  23 #include "common.h"
  24
  25 struct mangled
  26   {
  27     struct mangled *next;
  28     int type;
  29     char mangled[NAME_FIELD_SIZE];
  30     char *linked_to;
  31     char normal[1];
  32   };
  33
  34 /* Should use a hash table, etc. .  */
  35 struct mangled *first_mangle;
  36 int mangled_num = 0;
  37
  38 /*---------------------------------------------------------------------.
  39 | Extract a GNUTYPE_NAMES record contents.  It seems that such are not |
  40 | produced anymore by GNU tar, but we leave the reading code around    |
  41 | nevertheless, for salvaging old tapes.                               |
  42 `---------------------------------------------------------------------*/
  43
  44 void
  45 extract_mangle (void)
  46 {
  47   off_t size = current_stat.st_size;
  48   char *buffer = xmalloc ((size_t) (size + 1));
  49   char *copy = buffer;
  50   char *cursor = buffer;
  51
  52   if (size != (size_t) size || size == (size_t) -1)
  53     FATAL_ERROR ((0, 0, _("Memory exhausted")));
  54
  55   buffer[size] = '\0';
  56
  57   while (size > 0)
  58     {
  59       union block *block = find_next_block ();
  60       size_t available;
  61
  62       if (!block)
  63         {
  64           ERROR ((0, 0, _("Unexpected EOF in mangled names")));
  65           return;
  66         }
  67       available = available_space_after (block);
  68       if (available > size)
  69         available = size;
  70       memcpy (copy, block->buffer, available);
  71       copy += available;
  72       size -= available;
  73       set_next_block_after ((union block *) (block->buffer + available - 1));
  74     }
  75
  76   while (*cursor)
  77     {
  78       char *next_cursor;
  79       char *name;
  80       char *name_end;
  81
  82       next_cursor = strchr (cursor, '\n');
  83       *next_cursor++ = '\0';
  84
  85       if (!strncmp (cursor, "Rename ", 7))
  86         {
  87
  88           name = cursor + 7;
  89           name_end = strchr (name, ' ');
  90           while (strncmp (name_end, " to ", 4))
  91             {
  92               name_end++;
  93               name_end = strchr (name_end, ' ');
  94             }
  95           *name_end = '\0';
  96           if (next_cursor[-2] == '/')
  97             next_cursor[-2] = '\0';
  98           unquote_string (name_end + 4);
  99           if (rename (name, name_end + 4))
 100             ERROR ((0, errno, _("Cannot rename %s to %s"), name, name_end + 4));
 101           else if (verbose_option)
 102             WARN ((0, 0, _("Renamed %s to %s"), name, name_end + 4));
 103         }
 104 #ifdef S_ISLNK
 105       else if (!strncmp (cursor, "Symlink ", 8))
 106         {
 107           name = cursor + 8;
 108           name_end = strchr (name, ' ');
 109           while (strncmp (name_end, " to ", 4))
 110             {
 111               name_end++;
 112               name_end = strchr (name_end, ' ');
 113             }
 114           *name_end = '\0';
 115           unquote_string (name);
 116           unquote_string (name_end + 4);
 117           if (symlink (name, name_end + 4)
 118               && (unlink (name_end + 4) || symlink (name, name_end + 4)))
 119             ERROR ((0, errno, _("Cannot symlink %s to %s"),
 120                     name, name_end + 4));
 121           else if (verbose_option)
 122             WARN ((0, 0, _("Symlinked %s to %s"), name, name_end + 4));
 123         }
 124 #endif
 125       else
 126         ERROR ((0, 0, _("Unknown demangling command %s"), cursor));
 127
 128       cursor = next_cursor;
 129     }
 130 }