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

   1 /* Encode long filenames for GNU tar.
   2    Copyright 1988, 92, 94, 96, 97, 99, 2000 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    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #include <system.h>
  19 #include "common.h"
  20 #include <quotearg.h>
  21
  22 struct mangled
  23   {
  24     struct mangled *next;
  25     int type;
  26     char mangled[NAME_FIELD_SIZE];
  27     char *linked_to;
  28     char normal[1];
  29   };
  30
  31 /* Extract a GNUTYPE_NAMES record contents.  It seems that such are
  32    not produced anymore by GNU tar, but we leave the reading code
  33    around nevertheless, for salvaging old tapes.  */
  34 void
  35 extract_mangle (void)
  36 {
  37   off_t size = current_stat_info.stat.st_size;
  38   char *buffer = xmalloc ((size_t) (size + 1));
  39   char *copy = buffer;
  40   char *cursor = buffer;
  41
  42   if (size != (size_t) size || size == (size_t) -1)
  43     xalloc_die ();
  44
  45   buffer[size] = '\0';
  46
  47   while (size > 0)
  48     {
  49       union block *block = find_next_block ();
  50       size_t available;
  51
  52       if (!block)
  53         {
  54           ERROR ((0, 0, _("Unexpected EOF in mangled names")));
  55           return;
  56         }
  57       available = available_space_after (block);
  58       if (available > size)
  59         available = size;
  60       memcpy (copy, block->buffer, available);
  61       copy += available;
  62       size -= available;
  63       set_next_block_after ((union block *) (block->buffer + available - 1));
  64     }
  65
  66   while (*cursor)
  67     {
  68       char *next_cursor;
  69       char *name;
  70       char *name_end;
  71
  72       next_cursor = strchr (cursor, '\n');
  73       *next_cursor++ = '\0';
  74
  75       if (!strncmp (cursor, "Rename ", 7))
  76         {
  77
  78           name = cursor + 7;
  79           name_end = strchr (name, ' ');
  80           while (strncmp (name_end, " to ", 4))
  81             {
  82               name_end++;
  83               name_end = strchr (name_end, ' ');
  84             }
  85           *name_end = '\0';
  86           if (next_cursor[-2] == '/')
  87             next_cursor[-2] = '\0';
  88           unquote_string (name_end + 4);
  89           if (rename (name, name_end + 4))
  90             ERROR ((0, errno, _("%s: Cannot rename to %s"),
  91                     quotearg_colon (name), quote_n (1, name_end + 4)));
  92           else if (verbose_option)
  93             WARN ((0, 0, _("Renamed %s to %s"), name, name_end + 4));
  94         }
  95 #ifdef HAVE_SYMLINK
  96       else if (!strncmp (cursor, "Symlink ", 8))
  97         {
  98           name = cursor + 8;
  99           name_end = strchr (name, ' ');
 100           while (strncmp (name_end, " to ", 4))
 101             {
 102               name_end++;
 103               name_end = strchr (name_end, ' ');
 104             }
 105           *name_end = '\0';
 106           unquote_string (name);
 107           unquote_string (name_end + 4);
 108           if (symlink (name, name_end + 4)
 109               && (unlink (name_end + 4) || symlink (name, name_end + 4)))
 110             ERROR ((0, errno, _("%s: Cannot symlink to %s"),
 111                     quotearg_colon (name), quote_n (1, name_end + 4)));
 112           else if (verbose_option)
 113             WARN ((0, 0, _("Symlinked %s to %s"), name, name_end + 4));
 114         }
 115 #endif
 116       else
 117         ERROR ((0, 0, _("Unknown demangling command %s"), cursor));
 118
 119       cursor = next_cursor;
 120     }
 121 }