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104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/* Common implementation for scandir{at}.
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Copyright (C) 2018-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <string.h>
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#include <errno.h>
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int
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SCANDIR_TAIL (DIR *dp,
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DIRENT_TYPE ***namelist,
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int (*select) (const DIRENT_TYPE *),
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int (*cmp) (const DIRENT_TYPE **, const DIRENT_TYPE **))
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{
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if (dp == NULL)
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return -1;
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int save = errno;
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__set_errno (0);
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int result;
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struct scandir_cancel_struct c = { .dp = dp };
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__libc_cleanup_push (&__scandir_cancel_handler, &c);
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DIRENT_TYPE **v = NULL;
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size_t vsize = 0;
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DIRENT_TYPE *d;
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while ((d = READDIR (dp)) != NULL)
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{
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if (select != NULL)
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{
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int selected = (*select) (d);
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/* The SELECT function might have set errno to non-zero on
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success. It was zero before and it needs to be again to
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make the later tests work. */
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__set_errno (0);
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if (!selected)
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continue;
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}
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if (__glibc_unlikely (c.cnt == vsize))
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{
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if (vsize == 0)
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vsize = 10;
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else
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vsize *= 2;
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DIRENT_TYPE **new = realloc (v, vsize * sizeof *v);
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if (new == NULL)
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break;
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c.v = v = new;
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}
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size_t dsize = &d->d_name[_D_ALLOC_NAMLEN (d)] - (char *) d;
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DIRENT_TYPE *vnew = malloc (dsize);
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if (vnew == NULL)
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break;
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v[c.cnt++] = (DIRENT_TYPE *) memcpy (vnew, d, dsize);
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/* Ignore errors from readdir, malloc or realloc. These functions
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might have set errno to non-zero on success. It was zero before
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and it needs to be again to make the latter tests work. */
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__set_errno (0);
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}
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if (__glibc_likely (errno == 0))
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{
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__closedir (dp);
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/* Sort the list if we have a comparison function to sort with. */
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if (cmp != NULL)
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qsort (v, c.cnt, sizeof *v, (__compar_fn_t) cmp);
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*namelist = v;
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result = c.cnt;
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}
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else
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{
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/* This frees everything and calls closedir. */
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__scandir_cancel_handler (&c);
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result = -1;
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}
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__libc_cleanup_pop (0);
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if (result >= 0)
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__set_errno (save);
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return result;
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}
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