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extmod/vfs_lfsx: Normalize path name in chdir. 

This change scans for '.', '..' and multiple '/' and normalizes the new
path name.  If the resulting path does not exist, an error is raised.
Non-existing interim path elements are ignored if they are removed during
normalization.
This commit is contained in:
robert 2020-05-03 21:05:08 +02:00 committed by Damien George
parent a5ea4b9f3f
commit d3ea28d04a
3 changed files with 81 additions and 0 deletions
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37
extmod/vfs_lfsx.c
View File

@ -283,8 +283,45 @@ STATIC mp_obj_t MP_VFS_LFSx(chdir)(mp_obj_t self_in, mp_obj_t path_in) {
}
// If not at root add trailing / to make it easy to build paths
// and then normalise the path
if (vstr_len(&self->cur_dir) != 1) {
vstr_add_byte(&self->cur_dir, '/');
#define CWD_LEN (vstr_len(&self->cur_dir))
size_t to = 1;
size_t from = 1;
char *cwd = vstr_str(&self->cur_dir);
while (from < CWD_LEN) {
for (; cwd[from] == '/' && from < CWD_LEN; ++from) {
// Scan for the start
}
if (from > to) {
// Found excessive slash chars, squeeze them out
vstr_cut_out_bytes(&self->cur_dir, to, from - to);
from = to;
}
for (; cwd[from] != '/' && from < CWD_LEN; ++from) {
// Scan for the next /
}
if ((from - to) == 1 && cwd[to] == '.') {
// './', ignore
vstr_cut_out_bytes(&self->cur_dir, to, ++from - to);
from = to;
} else if ((from - to) == 2 && cwd[to] == '.' && cwd[to + 1] == '.') {
// '../', skip back
if (to > 1) {
// Only skip back if not at the tip
for (--to; to > 1 && cwd[to - 1] != '/'; --to) {
// Skip back
}
}
vstr_cut_out_bytes(&self->cur_dir, to, ++from - to);
from = to;
} else {
// Normal element, keep it and just move the offset
to = ++from;
}
}
}
return mp_const_none;

24
tests/extmod/vfs_lfs.py
View File

@ -98,6 +98,8 @@ def test(bdev, vfs_class):
print(list(vfs.ilistdir()))
# getcwd, chdir
vfs.mkdir("/testdir2")
vfs.mkdir("/testdir/subdir")
print(vfs.getcwd())
vfs.chdir("/testdir")
print(vfs.getcwd())
@ -111,7 +113,29 @@ def test(bdev, vfs_class):
# chdir back to root and remove testdir
vfs.chdir("/")
print(vfs.getcwd())
vfs.chdir("testdir")
print(vfs.getcwd())
vfs.chdir("..")
print(vfs.getcwd())
vfs.chdir("testdir/subdir")
print(vfs.getcwd())
vfs.chdir("../..")
print(vfs.getcwd())
vfs.chdir("/./testdir2")
print(vfs.getcwd())
vfs.chdir("../testdir")
print(vfs.getcwd())
vfs.chdir("../..")
print(vfs.getcwd())
vfs.chdir(".//testdir")
print(vfs.getcwd())
vfs.chdir("subdir/./")
print(vfs.getcwd())
vfs.chdir("/")
print(vfs.getcwd())
vfs.rmdir("testdir/subdir")
vfs.rmdir("testdir")
vfs.rmdir("testdir2")
bdev = RAMBlockDevice(30)

20
tests/extmod/vfs_lfs.py.exp
View File

@ -23,6 +23,16 @@ write 3
(32768, 0, 0, 0, 0, 0, 0, 0, 0, 0)
(32768, 0, 0, 0, 0, 0, 0, 0, 0, 0)
/
/testdir
/
/testdir/subdir
/
/testdir2
/testdir
/
/testdir
/testdir/subdir
/
test <class 'VfsLfs2'>
(1024, 1024, 30, 28, 28, 0, 0, 0, 0, 255)
(1024, 1024, 30, 28, 28, 0, 0, 0, 0, 255)
@ -48,3 +58,13 @@ write 3
(32768, 0, 0, 0, 0, 0, 0, 0, 0, 0)
(32768, 0, 0, 0, 0, 0, 0, 0, 0, 0)
/
/testdir
/
/testdir/subdir
/
/testdir2
/testdir
/
/testdir
/testdir/subdir
/