| /* Copyright (C) 1992-1998, 2000, 2002-2003, 2009-2020 Free Software |
| Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| This program is free software; you can redistribute it and/or modify it |
| under the terms of the GNU General Public License as published by the |
| Free Software Foundation; either version 2, or (at your option) any |
| later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, see <https://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| #include <dirent.h> |
| |
| #include <stdlib.h> |
| #include <string.h> |
| #include <errno.h> |
| #if _LIBC |
| # include <bits/libc-lock.h> |
| #endif |
| |
| #undef select |
| |
| #ifndef _D_EXACT_NAMLEN |
| # define _D_EXACT_NAMLEN(d) strlen ((d)->d_name) |
| #endif |
| #ifndef _D_ALLOC_NAMLEN |
| # ifndef __KLIBC__ |
| # define _D_ALLOC_NAMLEN(d) (_D_EXACT_NAMLEN (d) + 1) |
| # else |
| /* On OS/2 kLIBC, d_name is not the last field of struct dirent. See |
| <https://trac.netlabs.org/libc/browser/branches/libc-0.6/src/emx/include/sys/dirent.h#L68>. */ |
| # include <stddef.h> |
| # define _D_ALLOC_NAMLEN(d) (sizeof (struct dirent) - \ |
| offsetof (struct dirent, d_name)) |
| # endif |
| #endif |
| |
| #if _LIBC |
| # ifndef SCANDIR |
| # define SCANDIR scandir |
| # define READDIR __readdir |
| # define DIRENT_TYPE struct dirent |
| # endif |
| #else |
| # define SCANDIR scandir |
| # define READDIR readdir |
| # define DIRENT_TYPE struct dirent |
| # define __opendir opendir |
| # define __closedir closedir |
| # define __set_errno(val) errno = (val) |
| |
| /* The results of opendir() in this file are not used with dirfd and fchdir, |
| and we do not leak fds to any single-threaded code that could use stdio, |
| therefore save some unnecessary recursion in fchdir.c and opendir_safer.c. |
| FIXME - if the kernel ever adds support for multi-thread safety for |
| avoiding standard fds, then we should use opendir_safer. */ |
| # undef opendir |
| # undef closedir |
| #endif |
| |
| #ifndef SCANDIR_CANCEL |
| # define SCANDIR_CANCEL |
| struct scandir_cancel_struct |
| { |
| DIR *dp; |
| void *v; |
| size_t cnt; |
| }; |
| |
| # if _LIBC |
| static void |
| cancel_handler (void *arg) |
| { |
| struct scandir_cancel_struct *cp = arg; |
| size_t i; |
| void **v = cp->v; |
| |
| for (i = 0; i < cp->cnt; ++i) |
| free (v[i]); |
| free (v); |
| (void) __closedir (cp->dp); |
| } |
| # endif |
| #endif |
| |
| |
| int |
| #ifndef __KLIBC__ |
| SCANDIR (const char *dir, |
| DIRENT_TYPE ***namelist, |
| int (*select) (const DIRENT_TYPE *), |
| int (*cmp) (const DIRENT_TYPE **, const DIRENT_TYPE **)) |
| #else |
| /* On OS/2 kLIBC, scandir() declaration is different from POSIX. See |
| <https://trac.netlabs.org/libc/browser/branches/libc-0.6/src/emx/include/dirent.h#L141>. */ |
| SCANDIR (const char *dir, |
| DIRENT_TYPE ***namelist, |
| int (*select) (DIRENT_TYPE *), |
| int (*cmp) (const void *, const void *)) |
| #endif |
| { |
| DIR *dp = __opendir (dir); |
| DIRENT_TYPE **v = NULL; |
| size_t vsize = 0; |
| struct scandir_cancel_struct c; |
| DIRENT_TYPE *d; |
| int save; |
| |
| if (dp == NULL) |
| return -1; |
| |
| save = errno; |
| __set_errno (0); |
| |
| c.dp = dp; |
| c.v = NULL; |
| c.cnt = 0; |
| #if _LIBC |
| __libc_cleanup_push (cancel_handler, &c); |
| #endif |
| |
| while ((d = READDIR (dp)) != NULL) |
| { |
| int use_it = select == NULL; |
| |
| if (! use_it) |
| { |
| use_it = select (d); |
| /* The select function might have changed errno. It was |
| zero before and it need to be again to make the latter |
| tests work. */ |
| __set_errno (0); |
| } |
| |
| if (use_it) |
| { |
| DIRENT_TYPE *vnew; |
| size_t dsize; |
| |
| /* Ignore errors from select or readdir */ |
| __set_errno (0); |
| |
| if (__builtin_expect (c.cnt == vsize, 0)) |
| { |
| DIRENT_TYPE **new; |
| if (vsize == 0) |
| vsize = 10; |
| else |
| vsize *= 2; |
| new = (DIRENT_TYPE **) realloc (v, vsize * sizeof (*v)); |
| if (new == NULL) |
| break; |
| v = new; |
| c.v = (void *) v; |
| } |
| |
| dsize = &d->d_name[_D_ALLOC_NAMLEN (d)] - (char *) d; |
| vnew = (DIRENT_TYPE *) malloc (dsize); |
| if (vnew == NULL) |
| break; |
| |
| v[c.cnt++] = (DIRENT_TYPE *) memcpy (vnew, d, dsize); |
| } |
| } |
| |
| if (__builtin_expect (errno, 0) != 0) |
| { |
| save = errno; |
| |
| while (c.cnt > 0) |
| free (v[--c.cnt]); |
| free (v); |
| c.cnt = -1; |
| } |
| else |
| { |
| /* Sort the list if we have a comparison function to sort with. */ |
| if (cmp != NULL) |
| qsort (v, c.cnt, sizeof (*v), (int (*) (const void *, const void *)) cmp); |
| |
| *namelist = v; |
| } |
| |
| #if _LIBC |
| __libc_cleanup_pop (0); |
| #endif |
| |
| (void) __closedir (dp); |
| __set_errno (save); |
| |
| return c.cnt; |
| } |