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/* -*-mode: c; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-*/
/*
** Copyright (C) 2008-2012 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 3, or (at your option) any
** later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software Foundation,
** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif /*HAVE_CONFIG_H*/
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <glib/gprintf.h>
#include "mu-util.h"
#include "mu-maildir.h"
#include "mu-str.h"
#define MU_MAILDIR_NOINDEX_FILE ".noindex"
#define MU_MAILDIR_NOUPDATE_FILE ".noupdate"
/* On Linux (and some BSD), we have entry->d_type, but some file
* systems (XFS, ReiserFS) do not support it, and set it DT_UNKNOWN.
* On other OSs, notably Solaris, entry->d_type is not present at all.
* For these cases, we use lstat (in get_dtype) as a slower fallback,
* and return it in the d_type parameter
*/
#ifdef HAVE_STRUCT_DIRENT_D_TYPE
#define GET_DTYPE(DE,FP) \
((DE)->d_type == DT_UNKNOWN ? mu_util_get_dtype_with_lstat((FP)) : \
(DE)->d_type)
#else
#define GET_DTYPE(DE,FP) \
mu_util_get_dtype_with_lstat((FP))
#endif /*HAVE_STRUCT_DIRENT_D_TYPE*/
static gboolean
create_maildir (const char *path, mode_t mode, GError **err)
{
int i;
const gchar* subdirs[] = {"new", "cur", "tmp"};
for (i = 0; i != G_N_ELEMENTS(subdirs); ++i) {
const char *fullpath;
int rv;
/* static buffer */
fullpath = mu_str_fullpath_s (path, subdirs[i]);
/* if subdir already exists, don't try to re-create
* it */
if (mu_util_check_dir (fullpath, TRUE, TRUE))
continue;
rv = g_mkdir_with_parents (fullpath, (int)mode);
/* note, g_mkdir_with_parents won't detect an error if
* there's already such a dir, but with the wrong
* permissions; so we need to check */
if (rv != 0 || !mu_util_check_dir(fullpath, TRUE, TRUE))
return mu_util_g_set_error
(err,MU_ERROR_FILE_CANNOT_MKDIR,
"creating dir failed for %s: %s",
fullpath, strerror (errno));
}
return TRUE;
}
static gboolean
create_noindex (const char *path, GError **err)
{
/* create a noindex file if requested */
int fd;
const char *noindexpath;
/* static buffer */
noindexpath = mu_str_fullpath_s (path, MU_MAILDIR_NOINDEX_FILE);
fd = creat (noindexpath, 0644);
/* note, if the 'close' failed, creation may still have
* succeeded...*/
if (fd < 0 || close (fd) != 0)
return mu_util_g_set_error (err, MU_ERROR_FILE_CANNOT_CREATE,
"error in create_noindex: %s",
strerror (errno));
return TRUE;
}
gboolean
mu_maildir_mkdir (const char* path, mode_t mode, gboolean noindex, GError **err)
{
g_return_val_if_fail (path, FALSE);
MU_WRITE_LOG ("%s (%s, %o, %s)", __FUNCTION__,
path, mode, noindex ? "TRUE" : "FALSE");
if (!create_maildir (path, mode, err))
return FALSE;
if (noindex && !create_noindex (path, err))
return FALSE;
return TRUE;
}
/* determine whether the source message is in 'new' or in 'cur';
* we ignore messages in 'tmp' for obvious reasons */
static gboolean
check_subdir (const char *src, gboolean *in_cur, GError **err)
{
gboolean rv;
gchar *srcpath;
srcpath = g_path_get_dirname (src);
*in_cur = FALSE;
rv = TRUE;
if (g_str_has_suffix (srcpath, "cur"))
*in_cur = TRUE;
else if (!g_str_has_suffix (srcpath, "new"))
rv = mu_util_g_set_error (err,
MU_ERROR_FILE_INVALID_SOURCE,
"invalid source message '%s'",
src);
g_free (srcpath);
return rv;
}
static gchar*
get_target_fullpath (const char* src, const gchar *targetpath, GError **err)
{
gchar *targetfullpath, *srcfile;
gboolean in_cur;
if (!check_subdir (src, &in_cur, err))
return NULL;
srcfile = g_path_get_basename (src);
/* create targetpath; note: make the filename cough* unique by
*including a hash * of the srcname in the targetname. This
*helps if there are * copies of a message (which all have the
*same basename)*/
targetfullpath = g_strdup_printf ("%s%c%s%c%u_%s",
targetpath,
G_DIR_SEPARATOR,
in_cur ? "cur" : "new",
G_DIR_SEPARATOR,
g_str_hash(src),
srcfile);
g_free (srcfile);
return targetfullpath;
}
gboolean
mu_maildir_link (const char* src, const char *targetpath, GError **err)
{
gchar *targetfullpath;
int rv;
g_return_val_if_fail (src, FALSE);
g_return_val_if_fail (targetpath, FALSE);
targetfullpath = get_target_fullpath (src, targetpath, err);
if (!targetfullpath)
return FALSE;
rv = symlink (src, targetfullpath);
if (rv != 0)
mu_util_g_set_error (err, MU_ERROR_FILE_CANNOT_LINK,
"error creating link %s => %s: %s",
targetfullpath, src, strerror (errno));
g_free (targetfullpath);
return rv == 0 ? TRUE: FALSE;
}
static MuError
process_dir (const char* path, const gchar *mdir,
MuMaildirWalkMsgCallback msg_cb,
MuMaildirWalkDirCallback dir_cb, gboolean full,
void *data);
static MuError
process_file (const char* fullpath, const gchar* mdir,
MuMaildirWalkMsgCallback msg_cb, void *data)
{
MuError result;
struct stat statbuf;
if (!msg_cb)
return MU_OK;
if (G_UNLIKELY(access(fullpath, R_OK) != 0)) {
g_warning ("cannot access %s: %s", fullpath,
strerror(errno));
return MU_ERROR;
}
if (G_UNLIKELY(stat (fullpath, &statbuf) != 0)) {
g_warning ("cannot stat %s: %s", fullpath, strerror(errno));
return MU_ERROR;
}
result = (msg_cb)(fullpath, mdir, &statbuf, data);
if (result == MU_STOP)
g_debug ("callback said 'MU_STOP' for %s", fullpath);
else if (result == MU_ERROR)
g_warning ("%s: error in callback (%s)",
__FUNCTION__, fullpath);
return result;
}
/*
* determine if path is a maildir leaf-dir; ie. if it's 'cur' or 'new'
* (we're skipping 'tmp' for obvious reasons)
*/
G_GNUC_CONST static gboolean
is_maildir_new_or_cur (const char *path)
{
size_t len;
g_return_val_if_fail (path, FALSE);
/* path is the full path; it cannot possibly be shorter
* than 4 for a maildir (/cur or /new) */
len = strlen (path);
if (G_UNLIKELY(len < 4))
return FALSE;
/* optimization; one further idea would be cast the 4 bytes to an integer
* and compare that -- need to think about alignment, endianness */
if (path[len - 4] == G_DIR_SEPARATOR &&
path[len - 3] == 'c' &&
path[len - 2] == 'u' &&
path[len - 1] == 'r')
return TRUE;
if (path[len - 4] == G_DIR_SEPARATOR &&
path[len - 3] == 'n' &&
path[len - 2] == 'e' &&
path[len - 1] == 'w')
return TRUE;
return FALSE;
}
/* check if there path contains file; used for checking if there is
* MU_MAILDIR_NOINDEX_FILE or MU_MAILDIR_NOUPDATE_FILE in this
* dir; */
static gboolean
dir_contains_file (const char *path, const char *file)
{
const char* fullpath;
/* static buffer */
fullpath = mu_str_fullpath_s (path, file);
if (access (fullpath, F_OK) == 0)
return TRUE;
else if (G_UNLIKELY(errno != ENOENT))
g_warning ("error testing for %s/%s: %s",
fullpath, file, strerror(errno));
return FALSE;
}
static gboolean
is_dotdir_to_ignore (const char* dir)
{
int i;
const char* ignore[] = {
".notmuch",
".nnmaildir",
".#evolution"
}; /* when adding names, check the optimization below */
if (dir[0] != '.')
return FALSE; /* not a dotdir */
if (dir[1] == '\0' || (dir[1] == '.' && dir[2] == '\0'))
return TRUE; /* ignore '.' and '..' */
/* optimization: special dirs have 'n' or '#' in pos 1 */
if (dir[1] != 'n' && dir[1] != '#')
return FALSE; /* not special: don't ignore */
for (i = 0; i != G_N_ELEMENTS(ignore); ++i)
if (strcmp(dir, ignore[i]) == 0)
return TRUE;
return FALSE; /* don't ignore */
}
static gboolean
ignore_dir_entry (struct dirent *entry, unsigned char d_type)
{
if (G_LIKELY(d_type == DT_REG)) {
/* ignore emacs tempfiles */
if (entry->d_name[0] == '#')
return TRUE;
/* ignore dovecot metadata */
if (entry->d_name[0] == 'd' &&
strncmp (entry->d_name, "dovecot", 7) == 0)
return TRUE;
/* ignore special files */
if (entry->d_name[0] == '.')
return TRUE;
/* ignore core files */
if (entry->d_name[0] == 'c' &&
strncmp (entry->d_name, "core", 4) == 0)
return TRUE;
return FALSE; /* other files: don't ignore */
} else if (d_type == DT_DIR)
return is_dotdir_to_ignore (entry->d_name);
else
return TRUE; /* ignore non-normal files, non-dirs */
}
/*
* return the maildir value for the the path - this is the directory
* for the message (with the top-level dir as "/"), and without the
* leaf "/cur" or "/new". In other words, contatenate old_mdir + "/" + dir,
* unless dir is either 'new' or 'cur'. The value will be used in queries.
*/
static gchar*
get_mdir_for_path (const gchar *old_mdir, const gchar *dir)
{
/* if the current dir is not 'new' or 'cur', contatenate
* old_mdir an dir */
if ((dir[0] == 'n' && strcmp(dir, "new") == 0) ||
(dir[0] == 'c' && strcmp(dir, "cur") == 0) ||
(dir[0] == 't' && strcmp(dir, "tmp") == 0))
return strdup (old_mdir ? old_mdir : G_DIR_SEPARATOR_S);
else
return g_strconcat (old_mdir ? old_mdir : "",
G_DIR_SEPARATOR_S, dir, NULL);
}
static MuError
process_dir_entry (const char* path, const char* mdir, struct dirent *entry,
MuMaildirWalkMsgCallback cb_msg,
MuMaildirWalkDirCallback cb_dir,
gboolean full, void *data)
{
const char *fp;
char* fullpath;
unsigned char d_type;
/* we have to copy the buffer from fullpath_s, because it
* returns a static buffer, and we maybe called reentrantly */
fp = mu_str_fullpath_s (path, entry->d_name);
fullpath = g_newa (char, strlen(fp) + 1);
strcpy (fullpath, fp);
d_type = GET_DTYPE(entry, fullpath);
/* ignore special files/dirs */
if (ignore_dir_entry (entry, d_type))
return MU_OK;
switch (d_type) {
case DT_REG: /* we only want files in cur/ and new/ */
if (!is_maildir_new_or_cur (path))
return MU_OK;
return process_file (fullpath, mdir, cb_msg, data);
case DT_DIR: {
char *my_mdir;
MuError rv;
/* my_mdir is the search maildir (the dir starting
* with the top-level maildir as /, and without the
* /tmp, /cur, /new */
my_mdir = get_mdir_for_path (mdir, entry->d_name);
rv = process_dir (fullpath, my_mdir, cb_msg, cb_dir, full, data);
g_free (my_mdir);
return rv;
}
default:
return MU_OK; /* ignore other types */
}
}
static const size_t DIRENT_ALLOC_SIZE =
offsetof (struct dirent, d_name) + PATH_MAX;
static struct dirent*
dirent_new (void)
{
return (struct dirent*) g_slice_alloc (DIRENT_ALLOC_SIZE);
}
static void
dirent_destroy (struct dirent *entry)
{
g_slice_free1 (DIRENT_ALLOC_SIZE, entry);
}
#ifdef HAVE_STRUCT_DIRENT_D_INO
static int
dirent_cmp (struct dirent *d1, struct dirent *d2)
{
/* we do it his way instead of a simple d1->d_ino - d2->d_ino
* because this way, we don't need 64-bit numbers for the
* actual sorting */
if (d1->d_ino < d2->d_ino)
return -1;
else if (d1->d_ino > d2->d_ino)
return 1;
else
return 0;
}
#endif /*HAVE_STRUCT_DIRENT_D_INO*/
static MuError
process_dir_entries (DIR *dir, const char* path, const char* mdir,
MuMaildirWalkMsgCallback msg_cb,
MuMaildirWalkDirCallback dir_cb,
gboolean full, void *data)
{
MuError result;
GSList *lst, *c;
for (lst = NULL;;) {
int rv;
struct dirent *entry, *res;
entry = dirent_new ();
rv = readdir_r (dir, entry, &res);
if (rv == 0) {
if (res)
lst = g_slist_prepend (lst, entry);
else {
dirent_destroy (entry);
break; /* last direntry reached */
}
} else {
dirent_destroy (entry);
g_warning ("error scanning dir: %s", strerror(rv));
return MU_ERROR_FILE;
}
}
/* we sort by inode; this makes things much faster on
* extfs2,3 */
#if HAVE_STRUCT_DIRENT_D_INO
c = lst = g_slist_sort (lst, (GCompareFunc)dirent_cmp);
#endif /*HAVE_STRUCT_DIRENT_D_INO*/
for (c = lst, result = MU_OK; c && result == MU_OK; c = g_slist_next(c))
result = process_dir_entry (path, mdir, (struct dirent*)c->data,
msg_cb, dir_cb, full, data);
g_slist_foreach (lst, (GFunc)dirent_destroy, NULL);
g_slist_free (lst);
return result;
}
static MuError
process_dir (const char* path, const char* mdir,
MuMaildirWalkMsgCallback msg_cb, MuMaildirWalkDirCallback dir_cb,
gboolean full, void *data)
{
MuError result;
DIR* dir;
/* if it has a noindex file, we ignore this dir */
if (dir_contains_file (path, MU_MAILDIR_NOINDEX_FILE) ||
(!full && dir_contains_file (path, MU_MAILDIR_NOUPDATE_FILE))) {
g_debug ("found noindex/noupdate: ignoring dir %s", path);
return MU_OK;
}
dir = opendir (path);
if (G_UNLIKELY(!dir)) {
g_warning ("opendir failed %s: %s", path, strerror(errno));
return MU_OK;
}
if (dir_cb) {
MuError rv;
rv = dir_cb (path, TRUE, data);
if (rv != MU_OK) {
closedir (dir);
return rv;
}
}
result = process_dir_entries (dir, path, mdir, msg_cb, dir_cb, full, data);
closedir (dir);
/* only run dir_cb if it exists and so far, things went ok */
if (dir_cb && result == MU_OK)
return dir_cb (path, FALSE, data);
return result;
}
MuError
mu_maildir_walk (const char *path, MuMaildirWalkMsgCallback cb_msg,
MuMaildirWalkDirCallback cb_dir, gboolean full,
void *data)
{
MuError rv;
char *mypath;
g_return_val_if_fail (path && cb_msg, MU_ERROR);
g_return_val_if_fail (mu_util_check_dir(path, TRUE, FALSE), MU_ERROR);
/* strip the final / or \ */
mypath = g_strdup (path);
if (mypath[strlen(mypath)-1] == G_DIR_SEPARATOR)
mypath[strlen(mypath)-1] = '\0';
rv = process_dir (mypath, NULL, cb_msg, cb_dir, full, data);
g_free (mypath);
return rv;
}
static gboolean
clear_links (const gchar* dirname, DIR *dir, GError **err)
{
struct dirent *entry;
gboolean rv;
rv = TRUE;
errno = 0;
while ((entry = readdir (dir))) {
const char *fp;
char *fullpath;
unsigned char d_type;
/* ignore empty, dot thingies */
if (!entry->d_name || entry->d_name[0] == '.')
continue;
/* we have to copy the buffer from fullpath_s, because
* it returns a static buffer and we are
* recursive*/
fp = mu_str_fullpath_s (dirname, entry->d_name);
fullpath = g_newa (char, strlen(fp) + 1);
strcpy (fullpath, fp);
d_type = GET_DTYPE (entry, fullpath);
/* ignore non-links / non-dirs */
if (d_type != DT_LNK && d_type != DT_DIR)
continue;
if (d_type == DT_LNK) {
if (unlink (fullpath) != 0) {
/* don't use err */
g_warning ("error unlinking %s: %s",
fullpath, strerror(errno));
rv = FALSE;
}
} else /* DT_DIR, see check before*/
rv = mu_maildir_clear_links (fullpath, err);
}
if (errno != 0)
mu_util_g_set_error (err, MU_ERROR_FILE,
"file error: %s", strerror(errno));
return (rv == FALSE && errno == 0);
}
gboolean
mu_maildir_clear_links (const gchar* path, GError **err)
{
DIR *dir;
gboolean rv;
g_return_val_if_fail (path, FALSE);
dir = opendir (path);
if (!dir)
return mu_util_g_set_error (err, MU_ERROR_FILE_CANNOT_OPEN,
"failed to open %s: %s", path,
strerror(errno));
rv = clear_links (path, dir, err);
closedir (dir);
return rv;
}
MuFlags
mu_maildir_get_flags_from_path (const char *path)
{
g_return_val_if_fail (path, MU_FLAG_INVALID);
/* try to find the info part */
/* note that we can use either the ':' or '!' as separator;
* the former is the official, but as it does not work on e.g. VFAT
* file systems, some Maildir implementations use the latter instead
* (or both). For example, Tinymail/modest does this. The python
* documentation at http://docs.python.org/lib/mailbox-maildir.html
* mentions the '!' as well as a 'popular choice'
*/
/* we check the dir -- */
if (strstr (path, G_DIR_SEPARATOR_S "new" G_DIR_SEPARATOR_S)) {
char *dir, *dir2;
MuFlags flags;
dir = g_path_get_dirname (path);
dir2 = g_path_get_basename (dir);
if (g_strcmp0 (dir2, "new") == 0)
flags = MU_FLAG_NEW;
g_free (dir);
g_free (dir2);
/* NOTE: new/ message should not have :2,-stuff, as
* per http://cr.yp.to/proto/maildir.html. If they, do
* we ignore it
*/
if (flags == MU_FLAG_NEW)
return flags;
}
/* get the file flags */
{
char *info;
info = strrchr (path, '2');
if (!info || info == path ||
(info[-1] != ':' && info[-1] != '!') ||
(info[1] != ','))
return MU_FLAG_NONE;
else
return mu_flags_from_str
(&info[2], MU_FLAG_TYPE_MAILFILE,
TRUE /*ignore invalid */);
}
}
/*
* take an exising message path, and return a new path, based on
* whether it should be in 'new' or 'cur'; ie.
*
* /home/user/Maildir/foo/bar/cur/abc:2,F and flags == MU_FLAG_NEW
* => /home/user/Maildir/foo/bar/new
* and
* /home/user/Maildir/foo/bar/new/abc and flags == MU_FLAG_REPLIED
* => /home/user/Maildir/foo/bar/cur
*
* so the difference is whether MuFlags matches MU_FLAG_NEW is set or
* not; and in the latter case, no other flags are allowed.
*
*/
static gchar*
get_new_path (const char *mdir, const char *mfile, MuFlags flags,
const char* custom_flags)
{
if (flags & MU_FLAG_NEW)
return g_strdup_printf ("%s%cnew%c%s",
mdir, G_DIR_SEPARATOR, G_DIR_SEPARATOR,
mfile);
else {
const char *flagstr;
flagstr = mu_flags_to_str_s (flags, MU_FLAG_TYPE_MAILFILE);
return g_strdup_printf ("%s%ccur%c%s:2,%s%s",
mdir, G_DIR_SEPARATOR, G_DIR_SEPARATOR,
mfile, flagstr,
custom_flags ? custom_flags : "");
}
}
char*
mu_maildir_get_maildir_from_path (const char* path)
{
gchar *mdir;
/* determine the maildir */
mdir = g_path_get_dirname (path);
if (!g_str_has_suffix (mdir, "cur") &&
!g_str_has_suffix (mdir, "new")) {
g_warning ("%s: not a valid maildir path: %s",
__FUNCTION__, path);
g_free (mdir);
return NULL;
}
/* remove the 'cur' or 'new' */
mdir[strlen(mdir) - 4] = '\0';
return mdir;
}
char*
mu_maildir_get_new_path (const char *oldpath, const char *new_mdir,
MuFlags newflags)
{
char *mfile, *mdir, *custom_flags, *newpath, *cur;
g_return_val_if_fail (oldpath, NULL);
mfile = newpath = custom_flags = NULL;
/* determine the maildir */
mdir = mu_maildir_get_maildir_from_path (oldpath);
if (!mdir)
return NULL;
/* determine the name of the mailfile, stripped of its flags, as well
* as any custom (non-standard) flags */
mfile = g_path_get_basename (oldpath);
for (cur = &mfile[strlen(mfile)-1]; cur > mfile; --cur) {
if ((*cur == ':' || *cur == '!') &&
(cur[1] == '2' && cur[2] == ',')) {
/* get the custom flags (if any) */
custom_flags = mu_flags_custom_from_str (cur + 3);
cur[0] = '\0'; /* strip the flags */
break;
}
}
newpath = get_new_path (new_mdir ? new_mdir : mdir,
mfile, newflags, custom_flags);
g_free (mfile);
g_free (mdir);
g_free (custom_flags);
return newpath;
}
static gboolean
msg_move_check_pre (const gchar *src, const gchar *dst, GError **err)
{
if (!g_path_is_absolute(src))
return mu_util_g_set_error
(err, MU_ERROR_FILE,
"source is not an absolute path: '%s'", src);
if (!g_path_is_absolute(dst))
return mu_util_g_set_error
(err, MU_ERROR_FILE,
"target is not an absolute path: '%s'", dst);
if (access (src, R_OK) != 0)
return mu_util_g_set_error (err, MU_ERROR_FILE,
"cannot read %s", src);
if (access (dst, F_OK) == 0)
return mu_util_g_set_error (err, MU_ERROR_FILE,
"%s already exists", dst);
return TRUE;
}
static gboolean
msg_move_check_post (const char *src, const char *dst, GError **err)
{
/* double check -- is the target really there? */
if (access (dst, F_OK) != 0)
return mu_util_g_set_error
(err, MU_ERROR_FILE, "can't find target (%s)", dst);
if (access (src, F_OK) == 0)
return mu_util_g_set_error
(err, MU_ERROR_FILE, "source still there (%s)", src);
return TRUE;
}
static gboolean
msg_move (const char* src, const char *dst, GError **err)
{
if (!msg_move_check_pre (src, dst, err))
return FALSE;
if (rename (src, dst) != 0)
return mu_util_g_set_error
(err, MU_ERROR_FILE,"error moving %s to %s", src, dst);
return msg_move_check_post (src, dst, err);
}
gchar*
mu_maildir_move_message (const char* oldpath, const char* targetmdir,
MuFlags newflags, gboolean ignore_dups,
GError **err)
{
char *newfullpath;
gboolean rv;
gboolean src_is_target;
g_return_val_if_fail (oldpath, FALSE);
newfullpath = mu_maildir_get_new_path (oldpath, targetmdir,
newflags);
if (!newfullpath) {
mu_util_g_set_error (err, MU_ERROR_FILE,
"failed to determine targetpath");
return NULL;
}
src_is_target = (g_strcmp0 (oldpath, newfullpath) == 0);
if (!ignore_dups && src_is_target) {
mu_util_g_set_error (err, MU_ERROR_FILE_TARGET_EQUALS_SOURCE,
"target equals source");
return NULL;
}
if (!src_is_target) {
rv = msg_move (oldpath, newfullpath, err);
if (!rv) {
g_free (newfullpath);
return NULL;
}
}
return newfullpath;
}
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