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-rw-r--r--io/ftw.c187
1 files changed, 132 insertions, 55 deletions
diff --git a/io/ftw.c b/io/ftw.c
index e20ad231d3..7367f9733e 100644
--- a/io/ftw.c
+++ b/io/ftw.c
@@ -38,24 +38,44 @@ struct dir_data
char *content;
};
+struct known_object
+{
+ dev_t dev;
+ ino_t ino;
+};
+
struct ftw_data
{
+ /* Array with pointers to open directory streams. */
struct dir_data **dirstreams;
size_t actdir;
size_t maxdir;
+ /* Buffer containing name of currently processed object. */
char *dirbuf;
size_t dirbufsize;
+
+ /* Passed as fourth argument to `nftw' callback. The `base' member
+ tracks the content of the `dirbuf'. */
struct FTW ftw;
+ /* Flags passed to `nftw' function. 0 for `ftw'. */
int flags;
+ /* Conversion array for flag values. It is the identity mapping for
+ `nftw' calls, otherwise it maps the values to those know by
+ `ftw'. */
int *cvt_arr;
- __nftw_func_t func;
- struct stat st;
+ /* Callback function. We always use the `nftw' form. */
+ __nftw_func_t func;
+ /* Device of starting point. Needed for FTW_MOUNT. */
dev_t dev;
+
+ /* Data structure for keeping fingerprints of already processed
+ object. This is needed when not using FTW_PHYS. */
+ void *known_objects;
};
@@ -74,7 +94,36 @@ static int ftw_arr[] =
/* Forward declarations of local functions. */
-static int ftw_dir (struct ftw_data *data);
+static int ftw_dir (struct ftw_data *data, struct stat *st);
+
+
+static int
+object_compare (const void *p1, const void *p2)
+{
+ /* We don't need a sophisticated and useful comparison. We are only
+ interested in equality. */
+ return memcmp (p1, p2, sizeof (struct known_object));
+}
+
+
+static inline int
+add_object (struct ftw_data *data, struct stat *st)
+{
+ struct known_object *newp = malloc (sizeof (struct known_object));
+ if (newp == NULL)
+ return -1;
+ newp->dev = st->st_dev;
+ newp->ino = st->st_ino;
+ return __tsearch (newp, &data->known_objects, object_compare) ? 0 : -1;
+}
+
+
+static inline int
+find_object (struct ftw_data *data, struct stat *st)
+{
+ struct known_object obj = { dev: st->st_dev, ino: st->st_ino };
+ return __tfind (&obj, &data->known_objects, object_compare) != NULL;
+}
static inline int
@@ -170,6 +219,7 @@ static inline int
process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
size_t namlen)
{
+ struct stat st;
int result = 0;
int flag;
@@ -193,65 +243,72 @@ process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
memcpy (data->dirbuf + data->ftw.base, name, namlen);
data->dirbuf[data->ftw.base + namlen] = '\0';
- if (((data->flags & FTW_PHYS) ? lstat : stat) (data->dirbuf, &data->st) < 0)
+ if (((data->flags & FTW_PHYS) ? lstat : stat) (data->dirbuf, &st) < 0)
{
if (errno != EACCES && errno != ENOENT)
result = -1;
else if (!(data->flags & FTW_PHYS)
- && lstat (data->dirbuf, &data->st) == 0
- && S_ISLNK (data->st.st_mode))
+ && lstat (data->dirbuf, &st) == 0
+ && S_ISLNK (st.st_mode))
flag = FTW_SLN;
else
flag = FTW_NS;
}
else
{
- if (S_ISDIR (data->st.st_mode))
+ if (S_ISDIR (st.st_mode))
flag = FTW_D;
- else if (S_ISLNK (data->st.st_mode))
+ else if (S_ISLNK (st.st_mode))
flag = FTW_SL;
else
flag = FTW_F;
}
if (result == 0
- && (!(data->flags & FTW_MOUNT) || data->st.st_dev == data->dev))
+ && (!(data->flags & FTW_MOUNT) || flag == FTW_NS
+ || st.st_dev == data->dev))
{
- if (flag == FTW_D)
+ if ((data->flags & FTW_PHYS) || flag == FTW_NS
+ || (!find_object (data, &st)
+ /* Remember the object. */
+ && (result = add_object (data, &st)) == 0))
{
- result = ftw_dir (data);
-
- if (result == 0 && (data->flags & FTW_CHDIR))
+ if (flag == FTW_D)
{
- /* Change back to current directory. */
- int done = 0;
- if (dir->stream != NULL)
- if (fchdir (dirfd (dir->stream)) == 0)
- done = 1;
+ result = ftw_dir (data, &st);
- if (!done)
+ if (result == 0 && (data->flags & FTW_CHDIR))
{
- if (data->ftw.base == 1)
- {
- if (chdir ("/") < 0)
- result = -1;
- }
- else
- {
- /* Please note that we overwrite a slash. */
- data->dirbuf[data->ftw.base - 1] = '\0';
+ /* Change back to current directory. */
+ int done = 0;
+ if (dir->stream != NULL)
+ if (fchdir (dirfd (dir->stream)) == 0)
+ done = 1;
- if (chdir (data->dirbuf) < 0)
- result = -1;
+ if (!done)
+ {
+ if (data->ftw.base == 1)
+ {
+ if (chdir ("/") < 0)
+ result = -1;
+ }
else
- data->dirbuf[data->ftw.base - 1] = '/';
+ {
+ /* Please note that we overwrite a slash. */
+ data->dirbuf[data->ftw.base - 1] = '\0';
+
+ if (chdir (data->dirbuf) < 0)
+ result = -1;
+
+ data->dirbuf[data->ftw.base - 1] = '/';
+ }
}
}
}
+ else
+ result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
+ &data->ftw);
}
- else
- result = (*data->func) (data->dirbuf, &data->st, data->cvt_arr[flag],
- &data->ftw);
}
return result;
@@ -259,28 +316,34 @@ process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
static int
-ftw_dir (struct ftw_data *data)
+ftw_dir (struct ftw_data *data, struct stat *st)
{
struct dir_data dir;
struct dirent *d;
int previous_base = data->ftw.base;
- int result = 0;
+ int result;
char *startp;
+ /* Open the stream for this directory. This might require that
+ another stream has to be closed. */
+ result = open_dir_stream (data, &dir);
+ if (result != 0)
+ {
+ if (errno == EACCES)
+ /* We cannot read the directory. Signal this with a special flag. */
+ result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw);
+
+ return result;
+ }
+
/* First, report the directory (if not depth-first). */
if (!(data->flags & FTW_DEPTH))
{
- result = (*data->func) (data->dirbuf, &data->st, FTW_D, &data->ftw);
+ result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
if (result != 0)
return result;
}
- /* Open the stream for this directory. This might require that
- another stream has to be closed. */
- result = open_dir_stream (data, &dir);
- if (result != 0)
- return result;
-
/* If necessary, change to this directory. */
if (data->flags & FTW_CHDIR)
{
@@ -361,12 +424,13 @@ ftw_dir (struct ftw_data *data)
}
/* Prepare the return, revert the `struct FTW' information. */
+ data->dirbuf[data->ftw.base - 1] = '\0';
--data->ftw.level;
data->ftw.base = previous_base;
/* Finally, if we process depth-first report the directory. */
if (result == 0 && (data->flags & FTW_DEPTH))
- result = (*data->func) (data->dirbuf, &data->st, FTW_DP, &data->ftw);
+ result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw);
return result;
}
@@ -377,9 +441,10 @@ ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
int flags)
{
struct ftw_data data;
+ struct stat st;
int result = 0;
int save_err;
- char *cwd;
+ char *cwd = NULL;
char *cp;
/* First make sure the parameters are reasonable. */
@@ -399,7 +464,7 @@ ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
data.dirbuf = (char *) malloc (data.dirbufsize);
if (data.dirbuf == NULL)
return -1;
- cp = stpcpy (data.dirbuf, dir);
+ cp = __stpcpy (data.dirbuf, dir);
/* Strip trailing slashes. */
while (cp > data.dirbuf + 1 && cp[-1] == '/')
--cp;
@@ -426,6 +491,9 @@ ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
to reduce the value range before calling a `ftw' callback. */
data.cvt_arr = is_nftw ? nftw_arr : ftw_arr;
+ /* No object known so far. */
+ data.known_objects = NULL;
+
/* Now go to the directory containing the initial file/directory. */
if ((flags & FTW_CHDIR) && data.ftw.base > 0)
{
@@ -453,14 +521,14 @@ ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
/* Get stat info for start directory. */
if (result == 0)
- if (((flags & FTW_PHYS) ? lstat : stat) (data.dirbuf, &data.st) < 0)
+ if (((flags & FTW_PHYS) ? lstat : stat) (data.dirbuf, &st) < 0)
{
if (errno == EACCES)
- result = (*data.func) (data.dirbuf, &data.st, FTW_NS, &data.ftw);
+ result = (*data.func) (data.dirbuf, &st, FTW_NS, &data.ftw);
else if (!(flags & FTW_PHYS)
&& errno == ENOENT
- && lstat (dir, &data.st) == 0 && S_ISLNK (data.st.st_mode))
- result = (*data.func) (data.dirbuf, &data.st, data.cvt_arr[FTW_SLN],
+ && lstat (dir, &st) == 0 && S_ISLNK (st.st_mode))
+ result = (*data.func) (data.dirbuf, &st, data.cvt_arr[FTW_SLN],
&data.ftw);
else
/* No need to call the callback since we cannot say anything
@@ -469,16 +537,24 @@ ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
}
else
{
- if (S_ISDIR (data.st.st_mode))
+ if (S_ISDIR (st.st_mode))
{
- data.dev = data.st.st_dev;
- result = ftw_dir (&data);
+ /* Remember the device of the initial directory in case
+ FTW_MOUNT is given. */
+ data.dev = st.st_dev;
+
+ /* We know this directory now. */
+ if (!(flags & FTW_PHYS))
+ result = add_object (&data, &st);
+
+ if (result == 0)
+ result = ftw_dir (&data, &st);
}
else
{
- int flag = S_ISLNK (data.st.st_mode) ? FTW_SL : FTW_F;
+ int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F;
- result = (*data.func) (data.dirbuf, &data.st, data.cvt_arr[flag],
+ result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag],
&data.ftw);
}
}
@@ -494,6 +570,7 @@ ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
/* Free all memory. */
save_err = errno;
+ __tdestroy (data.known_objects, free);
free (data.dirbuf);
__set_errno (save_err);
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-27 09:31:28 +0000