[PATCH v4] ftw initial port
Eshan Dhawan
eshandhawan51@gmail.com
Wed Nov 4 18:57:39 GMT 2020
From: Eshan dhawan <eshandhawan51@gmail.com>
Signed-off-by: Eshan Dhawan <eshandhawan51@gmail.com>
---
newlib/libc/include/ftw.h | 69 +++++++++++++++
newlib/libc/posix/Makefile.am | 2 +-
newlib/libc/posix/ftw.c | 34 ++++++++
newlib/libc/posix/nftw.c | 156 ++++++++++++++++++++++++++++++++++
4 files changed, 260 insertions(+), 1 deletion(-)
create mode 100644 newlib/libc/include/ftw.h
create mode 100644 newlib/libc/posix/ftw.c
create mode 100644 newlib/libc/posix/nftw.c
diff --git a/newlib/libc/include/ftw.h b/newlib/libc/include/ftw.h
new file mode 100644
index 000000000..e38b6540f
--- /dev/null
+++ b/newlib/libc/include/ftw.h
@@ -0,0 +1,69 @@
+/*
+* Copyright © 2005-2020 Rich Felker, et al.
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be
+* included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef _FTW_H
+#define _FTW_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef _weak_alias(name, aliasname)
+# define _weak_alias(name, aliasname) \
+ extern __typeof (name) aliasname __attribute__ ((__weak__, __alias__ (#name)));
+#endif
+
+#include <sys/features.h>
+#include <sys/stat.h>
+
+#define FTW_F 1
+#define FTW_D 2
+#define FTW_DNR 3
+#define FTW_NS 4
+#define FTW_SL 5
+#define FTW_DP 6
+#define FTW_SLN 7
+
+#define FTW_PHYS 1
+#define FTW_MOUNT 2
+#define FTW_CHDIR 4
+#define FTW_DEPTH 8
+
+struct FTW {
+ int base;
+ int level;
+};
+
+int ftw(const char *, int (*)(const char *, const struct stat *, int), int);
+int nftw(const char *, int (*)(const char *, const struct stat *, int, struct FTW *), int, int);
+
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define ftw64 ftw
+#define nftw64 nftw
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/newlib/libc/posix/Makefile.am b/newlib/libc/posix/Makefile.am
index 6cdee1df0..5a358f782 100644
--- a/newlib/libc/posix/Makefile.am
+++ b/newlib/libc/posix/Makefile.am
@@ -10,7 +10,7 @@ GENERAL_SOURCES = \
opendir.c readdir.c readdir_r.c \
regcomp.c regerror.c regexec.c regfree.c \
rewinddir.c sleep.c usleep.c \
- telldir.c
+ telldir.c ftw.c nftw.c
ELIX_2_SOURCES = \
scandir.c seekdir.c
diff --git a/newlib/libc/posix/ftw.c b/newlib/libc/posix/ftw.c
new file mode 100644
index 000000000..693be13d0
--- /dev/null
+++ b/newlib/libc/posix/ftw.c
@@ -0,0 +1,34 @@
+/*
+* Copyright © 2005-2020 Rich Felker, et al.
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be
+* included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <ftw.h>
+
+int ftw(const char *path, int (*fn)(const char *, const struct stat *, int), int fd_limit)
+{
+ /* The following cast assumes that calling a function with one
+ * argument more than it needs behaves as expected. This is
+ * actually undefined, but works on all real-world machines. */
+ return nftw(path, (int (*)())fn, fd_limit, FTW_PHYS);
+}
+
+_weak_alias(ftw, ftw64);
diff --git a/newlib/libc/posix/nftw.c b/newlib/libc/posix/nftw.c
new file mode 100644
index 000000000..b78c13b7d
--- /dev/null
+++ b/newlib/libc/posix/nftw.c
@@ -0,0 +1,156 @@
+/*
+* Copyright © 2005-2020 Rich Felker, et al.
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be
+* included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <ftw.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <limits.h>
+#include <pthread.h>
+
+struct history
+{
+ struct history *chain;
+ dev_t dev;
+ ino_t ino;
+ int level;
+ int base;
+};
+
+#undef dirfd
+#define dirfd(d) (*(int *)d)
+
+static int do_nftw(char *path, int (*fn)(const char *, const struct stat *, int, struct FTW *), int fd_limit, int flags, struct history *h)
+{
+ size_t l = strlen(path), j = l && path[l-1]=='/' ? l-1 : l;
+ struct stat st;
+ struct history new;
+ int type;
+ int r;
+ struct FTW lev;
+
+ if ((flags & FTW_PHYS) ? lstat(path, &st) : stat(path, &st) < 0) {
+ if (!(flags & FTW_PHYS) && errno==ENOENT && !lstat(path, &st))
+ type = FTW_SLN;
+ else if (errno != EACCES) return -1;
+ else type = FTW_NS;
+ } else if (S_ISDIR(st.st_mode)) {
+ if (access(path, R_OK) < 0) type = FTW_DNR;
+ else if (flags & FTW_DEPTH) type = FTW_DP;
+ else type = FTW_D;
+ } else if (S_ISLNK(st.st_mode)) {
+ if (flags & FTW_PHYS) type = FTW_SL;
+ else type = FTW_SLN;
+ } else {
+ type = FTW_F;
+ }
+
+ if ((flags & FTW_MOUNT) && h && st.st_dev != h->dev)
+ return 0;
+
+ new.chain = h;
+ new.dev = st.st_dev;
+ new.ino = st.st_ino;
+ new.level = h ? h->level+1 : 0;
+ new.base = j+1;
+
+ lev.level = new.level;
+ if (h) {
+ lev.base = h->base;
+ } else {
+ size_t k;
+ for (k=j; k && path[k]=='/'; k--);
+ for (; k && path[k-1]!='/'; k--);
+ lev.base = k;
+ }
+
+ if (!(flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
+ return r;
+
+ for (; h; h = h->chain)
+ if (h->dev == st.st_dev && h->ino == st.st_ino)
+ return 0;
+
+ if ((type == FTW_D || type == FTW_DP) && fd_limit) {
+ DIR *d = opendir(path);
+ if (d) {
+ struct dirent *de;
+ while ((de = readdir(d))) {
+ if (de->d_name[0] == '.'
+ && (!de->d_name[1]
+ || (de->d_name[1]=='.'
+ && !de->d_name[2]))) continue;
+ if (strlen(de->d_name) >= PATH_MAX-l) {
+ errno = ENAMETOOLONG;
+ closedir(d);
+ return -1;
+ }
+ path[j]='/';
+ strcpy(path+j+1, de->d_name);
+ if ((r=do_nftw(path, fn, fd_limit-1, flags, &new))) {
+ closedir(d);
+ return r;
+ }
+ }
+ closedir(d);
+ } else if (errno != EACCES) {
+ return -1;
+ }
+ }
+
+ path[l] = 0;
+ if ((flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
+ return r;
+
+ return 0;
+}
+
+int nftw(const char *path, int (*fn)(const char *, const struct stat *, int, struct FTW *), int fd_limit, int flags)
+{
+ int r, cs;
+ size_t l;
+ char pathbuf[PATH_MAX+1];
+
+ if (fd_limit <= 0) return 0;
+
+ l = strlen(path);
+ if (l > PATH_MAX) {
+ errno = ENAMETOOLONG;
+ return -1;
+ }
+ memcpy(pathbuf, path, l+1);
+
+#ifdef _STDIO_WITH_THREAD_CANCELLATION_SUPPORT
+ pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
+#endif
+ r = do_nftw(pathbuf, fn, fd_limit, flags, NULL);
+#ifdef _STDIO_WITH_THREAD_CANCELLATION_SUPPORT
+ pthread_setcancelstate(cs, 0);
+#endif
+ return r;
+}
+
+_weak_alias(nftw, nftw64);
+
--
2.25.1
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