sysdeps/unix/sysv/linux/i386/scandir64.c

   1 /* Copyright (C) 2000-2018 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <dirent.h>
  19
  20 #define SCANDIR         __scandir64
  21 #define SCANDIR_TAIL    __scandir64_tail
  22 #define DIRENT_TYPE     struct dirent64
  23
  24 #include <dirent/scandir.c>
  25
  26 #undef  SCANDIR
  27 #undef  SCANDIR_TAIL
  28 #undef  DIRENT_TYPE
  29
  30 #include <shlib-compat.h>
  31
  32 versioned_symbol (libc, __scandir64, scandir64, GLIBC_2_2);
  33
  34 #if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_2)
  35 # include <string.h>
  36 # include <errno.h>
  37 # include "olddirent.h"
  38
  39 int
  40 __old_scandir64 (const char *dir, struct __old_dirent64 ***namelist,
  41                  int (*select) (const struct __old_dirent64 *),
  42                  int (*cmp) (const struct __old_dirent64 **,
  43                              const struct __old_dirent64 **))
  44 {
  45   DIR *dp = __opendir (dir);
  46   struct __old_dirent64 **v = NULL;
  47   size_t vsize = 0;
  48   struct scandir_cancel_struct c;
  49   struct __old_dirent64 *d;
  50   int save;
  51
  52   if (dp == NULL)
  53     return -1;
  54
  55   save = errno;
  56   __set_errno (0);
  57
  58   c.dp = dp;
  59   c.v = NULL;
  60   c.cnt = 0;
  61   __libc_cleanup_push (__scandir_cancel_handler, &c);
  62
  63   while ((d = __old_readdir64 (dp)) != NULL)
  64     {
  65       int use_it = select == NULL;
  66
  67       if (! use_it)
  68         {
  69           use_it = select (d);
  70           /* The select function might have changed errno.  It was
  71              zero before and it need to be again to make the latter
  72              tests work.  */
  73           __set_errno (0);
  74         }
  75
  76       if (use_it)
  77         {
  78           struct __old_dirent64 *vnew;
  79           size_t dsize;
  80
  81           /* Ignore errors from select or readdir */
  82           __set_errno (0);
  83
  84           if (__glibc_unlikely (c.cnt == vsize))
  85             {
  86               struct __old_dirent64 **new;
  87               if (vsize == 0)
  88                 vsize = 10;
  89               else
  90                 vsize *= 2;
  91               new = (struct __old_dirent64 **) realloc (v,
  92                                                         vsize * sizeof (*v));
  93               if (new == NULL)
  94                 break;
  95               v = new;
  96               c.v = (void *) v;
  97             }
  98
  99           dsize = &d->d_name[_D_ALLOC_NAMLEN (d)] - (char *) d;
 100           vnew = (struct __old_dirent64 *) malloc (dsize);
 101           if (vnew == NULL)
 102             break;
 103
 104           v[c.cnt++] = (struct __old_dirent64 *) memcpy (vnew, d, dsize);
 105         }
 106     }
 107
 108   if (__builtin_expect (errno, 0) != 0)
 109     {
 110       save = errno;
 111
 112       while (c.cnt > 0)
 113         free (v[--c.cnt]);
 114       free (v);
 115       c.cnt = -1;
 116     }
 117   else
 118     {
 119       /* Sort the list if we have a comparison function to sort with.  */
 120       if (cmp != NULL)
 121         qsort (v, c.cnt, sizeof (*v),
 122                (int (*) (const void *, const void *)) cmp);
 123
 124       *namelist = v;
 125     }
 126
 127   __libc_cleanup_pop (0);
 128
 129   (void) __closedir (dp);
 130   __set_errno (save);
 131
 132   return c.cnt;
 133 }
 134 compat_symbol (libc, __old_scandir64, scandir64, GLIBC_2_1);
 135
 136 #endif