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

   1 /* Copyright (C) 2000-2015 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 (dir, namelist, select, cmp)
  41      const char *dir;
  42      struct __old_dirent64 ***namelist;
  43      int (*select) (const struct __old_dirent64 *);
  44      int (*cmp) (const struct __old_dirent64 **,
  45                  const struct __old_dirent64 **);
  46 {
  47   DIR *dp = __opendir (dir);
  48   struct __old_dirent64 **v = NULL;
  49   size_t vsize = 0;
  50   struct scandir_cancel_struct c;
  51   struct __old_dirent64 *d;
  52   int save;
  53
  54   if (dp == NULL)
  55     return -1;
  56
  57   save = errno;
  58   __set_errno (0);
  59
  60   c.dp = dp;
  61   c.v = NULL;
  62   c.cnt = 0;
  63   __libc_cleanup_push (__scandir_cancel_handler, &c);
  64
  65   while ((d = __old_readdir64 (dp)) != NULL)
  66     {
  67       int use_it = select == NULL;
  68
  69       if (! use_it)
  70         {
  71           use_it = select (d);
  72           /* The select function might have changed errno.  It was
  73              zero before and it need to be again to make the latter
  74              tests work.  */
  75           __set_errno (0);
  76         }
  77
  78       if (use_it)
  79         {
  80           struct __old_dirent64 *vnew;
  81           size_t dsize;
  82
  83           /* Ignore errors from select or readdir */
  84           __set_errno (0);
  85
  86           if (__glibc_unlikely (c.cnt == vsize))
  87             {
  88               struct __old_dirent64 **new;
  89               if (vsize == 0)
  90                 vsize = 10;
  91               else
  92                 vsize *= 2;
  93               new = (struct __old_dirent64 **) realloc (v,
  94                                                         vsize * sizeof (*v));
  95               if (new == NULL)
  96                 break;
  97               v = new;
  98               c.v = (void *) v;
  99             }
 100
 101           dsize = &d->d_name[_D_ALLOC_NAMLEN (d)] - (char *) d;
 102           vnew = (struct __old_dirent64 *) malloc (dsize);
 103           if (vnew == NULL)
 104             break;
 105
 106           v[c.cnt++] = (struct __old_dirent64 *) memcpy (vnew, d, dsize);
 107         }
 108     }
 109
 110   if (__builtin_expect (errno, 0) != 0)
 111     {
 112       save = errno;
 113
 114       while (c.cnt > 0)
 115         free (v[--c.cnt]);
 116       free (v);
 117       c.cnt = -1;
 118     }
 119   else
 120     {
 121       /* Sort the list if we have a comparison function to sort with.  */
 122       if (cmp != NULL)
 123         qsort (v, c.cnt, sizeof (*v),
 124                (int (*) (const void *, const void *)) cmp);
 125
 126       *namelist = v;
 127     }
 128
 129   __libc_cleanup_pop (0);
 130
 131   (void) __closedir (dp);
 132   __set_errno (save);
 133
 134   return c.cnt;
 135 }
 136 compat_symbol (libc, __old_scandir64, scandir64, GLIBC_2_1);
 137
 138 #endif