lib/xfts.c

   1 /* xfts.c -- a wrapper for fts_open
   2
   3    Copyright (C) 2003, 2005-2007, 2009 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation, either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Jim Meyering.  */
  19
  20 #include <config.h>
  21
  22 #include <stdbool.h>
  23 #include <stdlib.h>
  24
  25 #include "error.h"
  26
  27 #include "gettext.h"
  28 #define _(msgid) gettext (msgid)
  29
  30 #include "quote.h"
  31 #include "xalloc.h"
  32 #include "xfts.h"
  33
  34 /* Fail with a proper diagnostic if fts_open fails.  */
  35
  36 FTS *
  37 xfts_open (char * const *argv, int options,
  38            int (*compar) (const FTSENT **, const FTSENT **))
  39 {
  40   FTS *fts = fts_open (argv, options | FTS_CWDFD, compar);
  41   if (fts == NULL)
  42     {
  43       /* This can fail in three ways: out of memory, invalid bit_flags,
  44          and one or more of the FILES is an empty string.  We could try
  45          to decipher that errno==EINVAL means invalid bit_flags and
  46          errno==ENOENT means there's an empty string, but that seems wrong.
  47          Ideally, fts_open would return a proper error indicator.  For now,
  48          we'll presume that the bit_flags are valid and just check for
  49          empty strings.  */
  50       bool invalid_arg = false;
  51       for (; *argv; ++argv)
  52         {
  53           if (**argv == '\0')
  54             invalid_arg = true;
  55         }
  56       if (invalid_arg)
  57         error (EXIT_FAILURE, 0, _("invalid argument: %s"), quote (""));
  58       else
  59         xalloc_die ();
  60     }
  61
  62   return fts;
  63 }