1 /* Common implementation for scandir{at}.
2 Copyright (C) 2018-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library 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 GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
23 SCANDIR_TAIL (DIR *dp,
24 DIRENT_TYPE ***namelist,
25 int (*select) (const DIRENT_TYPE *),
26 int (*cmp) (const DIRENT_TYPE **, const DIRENT_TYPE **))
35 struct scandir_cancel_struct c = { .dp = dp };
36 __libc_cleanup_push (&__scandir_cancel_handler, &c);
38 DIRENT_TYPE **v = NULL;
41 while ((d = READDIR (dp)) != NULL)
45 int selected = (*select) (d);
47 /* The SELECT function might have set errno to non-zero on
48 success. It was zero before and it needs to be again to
49 make the later tests work. */
56 if (__glibc_unlikely (c.cnt == vsize))
62 DIRENT_TYPE **new = realloc (v, vsize * sizeof *v);
68 size_t dsize = &d->d_name[_D_ALLOC_NAMLEN (d)] - (char *) d;
69 DIRENT_TYPE *vnew = malloc (dsize);
72 v[c.cnt++] = (DIRENT_TYPE *) memcpy (vnew, d, dsize);
74 /* Ignore errors from readdir, malloc or realloc. These functions
75 might have set errno to non-zero on success. It was zero before
76 and it needs to be again to make the latter tests work. */
80 if (__glibc_likely (errno == 0))
84 /* Sort the list if we have a comparison function to sort with. */
86 qsort (v, c.cnt, sizeof *v, (__compar_fn_t) cmp);
93 /* This frees everything and calls closedir. */
94 __scandir_cancel_handler (&c);
98 __libc_cleanup_pop (0);