src/scandir.c

   1 /* Copyright (C) 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with this library; if not, write to the Free Software
  16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  17 USA.  */
  18
  19 #if defined(WIN32) && !defined(__CYGWIN__)
  20 #  include "scandir_win32.c"
  21 #else
  22
  23 #  include "flstring.h"
  24
  25 #  if !HAVE_SCANDIR
  26 #    include <stdlib.h>
  27 #    include <sys/types.h>
  28 #    include <errno.h>
  29
  30 #    if HAVE_DIRENT_H
  31 #      include <dirent.h>
  32 #      define NAMLEN(dirent) strlen((dirent)->d_name)
  33 #    else
  34 #      define dirent direct
  35 #      define NAMLEN(dirent) (dirent)->d_namlen
  36 #      if HAVE_SYS_NDIR_H
  37 #        include <sys/ndir.h>
  38 #      endif
  39 #      if HAVE_SYS_DIR_H
  40 #        include <sys/dir.h>
  41 #      endif
  42 #      if HAVE_NDIR_H
  43 #        include <ndir.h>
  44 #      endif
  45 #    endif
  46
  47 int
  48 fl_scandir(const char *dir, struct dirent ***namelist,
  49            int (*select)(struct dirent *),
  50            int (*compar)(struct dirent **, struct dirent **))
  51 {
  52   DIR *dp = opendir (dir);
  53   struct dirent **v = NULL;
  54   size_t vsize = 0, i;
  55   struct dirent *d;
  56   int save;
  57
  58   if (dp == NULL)
  59     return -1;
  60
  61   save = errno;
  62   errno = 0;
  63
  64   i = 0;
  65   while ((d = readdir (dp)) != NULL)
  66     if (select == NULL || (*select) (d))
  67       {
  68       size_t dsize;
  69
  70       if (i == vsize)
  71         {
  72           struct dirent **newv;
  73           if (vsize == 0)
  74             vsize = 10;
  75           else
  76             vsize *= 2;
  77           newv = (struct dirent **) realloc (v, vsize * sizeof (*v));
  78           if (newv == NULL)
  79             {
  80             lose:
  81               errno = ENOMEM;
  82               break;
  83             }
  84           v = newv;
  85         }
  86
  87 #    define _D_EXACT_NAMLEN(d) (strlen ((d)->d_name))
  88 #    define _D_ALLOC_NAMLEN(d) (sizeof (d)->d_name > 1 ? sizeof (d)->d_name : \
  89                               _D_EXACT_NAMLEN (d) + 1)
  90
  91       dsize = &d->d_name[_D_ALLOC_NAMLEN (d)] - (char *) d;
  92       v[i] = (struct dirent *) malloc (dsize);
  93       if (v[i] == NULL)
  94         goto lose;
  95
  96       memcpy (v[i++], d, dsize);
  97       }
  98
  99   if (errno != 0)
 100     {
 101       save = errno;
 102       (void) closedir (dp);
 103       while (i > 0)
 104       free (v[--i]);
 105       free (v);
 106       errno = save;
 107       return -1;
 108     }
 109
 110   (void) closedir (dp);
 111   errno = save;
 112
 113   /* Sort the list if we have a comparison function to sort with.  */
 114   if (compar) qsort (v, i, sizeof (*v), (int (*)(const void *, const void *))compar);
 115   *namelist = v;
 116   return i;
 117 }
 118
 119 #  endif
 120 #endif
 121
 122 /*
 123  * End of "$Id: scandir.c 8192 2011-01-05 16:50:10Z manolo $".
 124  */