Fix ftw/nftw to only report unreadable directories once.
Also remove all the copy & paste.
Bug: http://b/28197840
Change-Id: Ia43e9ffd838dabb511a6e54403d6f62066383e4d
diff --git a/libc/bionic/ftw.cpp b/libc/bionic/ftw.cpp
new file mode 100644
index 0000000..2123619
--- /dev/null
+++ b/libc/bionic/ftw.cpp
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2003, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
+ */
+
+#include <errno.h>
+#include <fts.h>
+#include <ftw.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+static int do_nftw(const char *path,
+ int (*ftw_fn)(const char*, const struct stat*, int),
+ int (*nftw_fn)(const char*, const struct stat*, int, FTW*),
+ int nfds,
+ int nftw_flags) {
+ // TODO: nfds is currently unused.
+ if (nfds < 1) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ // Translate to fts_open options.
+ int fts_options = FTS_LOGICAL | FTS_COMFOLLOW | FTS_NOCHDIR;
+ if (nftw_fn) {
+ fts_options = FTS_COMFOLLOW | ((nftw_flags & FTW_PHYS) ? FTS_PHYSICAL : FTS_LOGICAL);
+ if (!(nftw_flags & FTW_CHDIR)) fts_options |= FTS_NOCHDIR;
+ if (nftw_flags & FTW_MOUNT) fts_options |= FTS_XDEV;
+ }
+ bool postorder = (nftw_flags & FTW_DEPTH) != 0;
+
+ // Call fts_open.
+ char* const paths[2] = { const_cast<char*>(path), nullptr };
+ FTS* fts = fts_open(paths, fts_options, nullptr);
+ if (fts == nullptr) {
+ return -1;
+ }
+
+ // Translate fts_read results into ftw/nftw callbacks.
+ int error = 0;
+ FTSENT* cur;
+ while (error == 0 && (cur = fts_read(fts)) != nullptr) {
+ int fn_flag;
+ switch (cur->fts_info) {
+ case FTS_D:
+ // In the postorder case, we'll translate FTS_DP to FTW_DP later.
+ // In the can't-access case, we'll translate FTS_DNR to FTW_DNR later.
+ if (postorder || access(cur->fts_path, R_OK) == -1) continue;
+ fn_flag = FTW_D;
+ break;
+ case FTS_DNR:
+ fn_flag = FTW_DNR;
+ break;
+ case FTS_DP:
+ if (!postorder) continue;
+ fn_flag = FTW_DP;
+ break;
+ case FTS_F:
+ case FTS_DEFAULT:
+ fn_flag = FTW_F;
+ break;
+ case FTS_NS:
+ case FTS_NSOK:
+ fn_flag = FTW_NS;
+ break;
+ case FTS_SL:
+ fn_flag = FTW_SL;
+ break;
+ case FTS_SLNONE:
+ fn_flag = (nftw_fn != nullptr) ? FTW_SLN : FTW_NS;
+ break;
+ case FTS_DC:
+ errno = ELOOP;
+ error = -1;
+ continue;
+ default:
+ error = -1;
+ continue;
+ }
+
+ // Call the appropriate function.
+ if (nftw_fn != nullptr) {
+ FTW ftw;
+ ftw.base = cur->fts_pathlen - cur->fts_namelen;
+ ftw.level = cur->fts_level;
+ error = nftw_fn(cur->fts_path, cur->fts_statp, fn_flag, &ftw);
+ } else {
+ error = ftw_fn(cur->fts_path, cur->fts_statp, fn_flag);
+ }
+ }
+
+ int saved_errno = errno;
+ if (fts_close(fts) != 0 && error == 0) {
+ error = -1;
+ } else {
+ errno = saved_errno;
+ }
+ return error;
+}
+
+int ftw(const char* path, int (*ftw_fn)(const char*, const struct stat*, int), int nfds) {
+ return do_nftw(path, ftw_fn, nullptr, nfds, 0);
+}
+
+int nftw(const char* path, int (*nftw_fn)(const char*, const struct stat*, int, FTW*),
+ int nfds, int nftw_flags) {
+ return do_nftw(path, nullptr, nftw_fn, nfds, nftw_flags);
+}