diff options
Diffstat (limited to 'newlib/libc/posix/readdir_r.c')
-rw-r--r-- | newlib/libc/posix/readdir_r.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/newlib/libc/posix/readdir_r.c b/newlib/libc/posix/readdir_r.c new file mode 100644 index 000000000..805180cf5 --- /dev/null +++ b/newlib/libc/posix/readdir_r.c @@ -0,0 +1,108 @@ +#ifndef HAVE_OPENDIR + +/* + * Copyright (c) 1983 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* this code is modified from readdir.c by Jeff Johnston, June 5, 2002 */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)readdir.c 5.7 (Berkeley) 6/1/90"; +#endif /* LIBC_SCCS and not lint */ + +#include <dirent.h> +#include <errno.h> +#include <string.h> + +extern int getdents (int fd, void *dp, int count); + +/* + * get next entry in a directory using supplied dirent structure. + */ +int +readdir_r(dirp, dp, dpp) + register DIR *dirp; + struct dirent *dp; + struct dirent **dpp; { + +struct dirent *tmpdp; + +#ifdef HAVE_DD_LOCK + __lock_acquire_recursive(dirp->dd_lock); +#endif + + if (dirp->dd_fd == -1) { + *dpp = NULL; + return errno = EBADF; + } + + for (;;) { + if (dirp->dd_loc == 0) { + dirp->dd_size = getdents (dirp->dd_fd, + dirp->dd_buf, + dirp->dd_len); + + if (dirp->dd_size <= 0) { +#ifdef HAVE_DD_LOCK + __lock_release_recursive(dirp->dd_lock); +#endif + *dpp = NULL; + return errno; + } + } + if (dirp->dd_loc >= dirp->dd_size) { + dirp->dd_loc = 0; + continue; + } + tmpdp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); + memcpy (dp, tmpdp, sizeof(struct dirent)); + + if (dp->d_reclen <= 0 || + dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) { +#ifdef HAVE_DD_LOCK + __lock_release_recursive(dirp->dd_lock); +#endif + *dpp = NULL; + return -1; + } + dirp->dd_loc += dp->d_reclen; + if (dp->d_ino == 0) + continue; +#ifdef HAVE_DD_LOCK + __lock_release_recursive(dirp->dd_lock); +#endif + *dpp = dp; + return 0; + } +} + +#endif /* ! HAVE_OPENDIR */ |