expand_arg.c

   1 /*
   2  * User FTP Server,  Share folders over FTP without being root.
   3  * Copyright (C) 2008  Isaac Jurado
   4  *
   5  * This program is free software; you can redistribute it and/or modify it under
   6  * the terms of the GNU General Public License as published by the Free Software
   7  * Foundation; either version 2 of the License, or (at your option) any later
   8  * version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  12  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  13  * details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  18  */
  19
  20 #include "uftps.h"
  21 #include <string.h>
  22
  23
  24 /*
  25  * Expand the command argument to its corresponding full "virtual" path.  This
  26  * is necessary because chdir() is never performed so the correct path needs to
  27  * be resolved for each file or directory to be accessed.
  28  *
  29  * Returns the length of the expanded argument, including the trailing null
  30  * byte (just as apply_path() does).
  31  */
  32 int expand_arg (void)
  33 {
  34         int  len = SS.cwd_len;
  35
  36         memcpy(SS.aux, SS.cwd, len);
  37
  38         if (SS.arg != NULL)
  39         {
  40                 len = apply_path(SS.arg, SS.aux, len);
  41                 if (len == -1)
  42                 {
  43                         reply_c("552 Path overflow.\r\n");
  44                         fatal("Path overflow expanding argument");
  45                 }
  46         }
  47
  48         SS.arg = SS.aux;
  49         debug("Argument expanded to '%s'", SS.arg);
  50         return len;
  51 }
  52