dirent/scandir.c

   1 /* Copyright (C) 1992, 1993, 1994 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 the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <dirent.h>
  21 #include <stdlib.h>
  22
  23 int
  24 DEFUN(scandir, (dir, namelist, select, cmp),
  25       CONST char *dir AND
  26       struct dirent ***namelist AND
  27       int EXFUN((*select), (struct dirent *)) AND
  28       int EXFUN((*cmp), (CONST PTR, CONST PTR)))
  29 {
  30   DIR *dp = opendir (dir);
  31   struct dirent **v = NULL;
  32   size_t vsize = 0, i;
  33   struct dirent *d;
  34   int save;
  35
  36   if (dp == NULL)
  37     return -1;
  38
  39   save = errno;
  40   errno = 0;
  41
  42   i = 0;
  43   while ((d = readdir (dp)) != NULL)
  44     if (select == NULL || (*select) (d))
  45       {
  46         if (i == vsize)
  47           {
  48             struct dirent **new;
  49             if (vsize == 0)
  50               vsize = 10;
  51             else
  52               vsize *= 2;
  53             new = (struct dirent **) realloc (v, vsize * sizeof (*v));
  54             if (new == NULL)
  55               {
  56               lose:
  57                 errno = ENOMEM;
  58                 break;
  59               }
  60             v = new;
  61           }
  62
  63         v[i] = (struct dirent *) malloc (sizeof (**v));
  64         if (v[i] == NULL)
  65           goto lose;
  66
  67         *v[i++] = *d;
  68       }
  69
  70   if (errno != 0)
  71     {
  72       save = errno;
  73       (void) closedir (dp);
  74       while (i > 0)
  75         free (v[--i]);
  76       free (v);
  77       errno = save;
  78       return -1;
  79     }
  80
  81   (void) closedir (dp);
  82   errno = save;
  83
  84   /* Sort the list if we have a comparison function to sort with.  */
  85   if (cmp != NULL)
  86     qsort (v, i, sizeof (*v), cmp);
  87   *namelist = v;
  88   return i;
  89 }