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From 6f1143425a3afc4eb5086e9c90e7efb3affd7cb7 Mon Sep 17 00:00:00 2001
From: Tony Ambardar <Tony.Ambardar@gmail.com>
Date: Sat, 11 Jul 2020 06:35:46 -0700
Subject: [PATCH 2/2] nftw: support common gnu extension
Signed-off-by: Tony Ambardar <Tony.Ambardar@gmail.com>
---
include/ftw.h | 8 ++++++++
src/misc/nftw.c | 35 ++++++++++++++++++++++++++++++-----
2 files changed, 38 insertions(+), 5 deletions(-)
--- a/include/ftw.h
+++ b/include/ftw.h
@@ -21,6 +21,14 @@ extern "C" {
#define FTW_CHDIR 4
#define FTW_DEPTH 8
+#ifdef _GNU_SOURCE
+#define FTW_ACTIONRETVAL 16
+#define FTW_CONTINUE 0
+#define FTW_STOP 1
+#define FTW_SKIP_SUBTREE 2
+#define FTW_SKIP_SIBLINGS 3
+#endif
+
struct FTW {
int base;
int level;
--- a/src/misc/nftw.c
+++ b/src/misc/nftw.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
#include <ftw.h>
#include <dirent.h>
#include <fcntl.h>
@@ -72,8 +73,20 @@ static int do_nftw(char *path, int (*fn)
if (!fd_limit) close(dfd);
}
- if (!(flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
- return r;
+ if (!(flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev))) {
+ if (flags & FTW_ACTIONRETVAL)
+ switch (r) {
+ case FTW_SKIP_SUBTREE:
+ h = NULL;
+ case FTW_CONTINUE:
+ break;
+ case FTW_SKIP_SIBLINGS:
+ case FTW_STOP:
+ return r;
+ }
+ else
+ return r;
+ }
for (; h; h = h->chain)
if (h->dev == st.st_dev && h->ino == st.st_ino)
@@ -101,7 +114,10 @@ static int do_nftw(char *path, int (*fn)
strcpy(path+j+1, de->d_name);
if ((r=do_nftw(path, fn, fd_limit-1, flags, &new))) {
closedir(d);
- return r;
+ if ((flags & FTW_ACTIONRETVAL) && r == FTW_SKIP_SIBLINGS)
+ break;
+ else
+ return r;
}
}
closedir(d);
@@ -112,8 +128,16 @@ static int do_nftw(char *path, int (*fn)
}
path[l] = 0;
- if ((flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
- return r;
+ if ((flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev))) {
+ if (flags & FTW_ACTIONRETVAL)
+ switch (r) {
+ case FTW_SKIP_SIBLINGS:
+ case FTW_STOP:
+ return r;
+ }
+ else
+ return r;
+ }
return 0;
}
@@ -139,4 +163,5 @@ int nftw(const char *path, int (*fn)(con
return r;
}
+#undef nftw64
weak_alias(nftw, nftw64);
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