1try:
2    import uerrno
3    import uos
4except ImportError:
5    print("SKIP")
6    raise SystemExit
7
8try:
9    uos.VfsFat
10except AttributeError:
11    print("SKIP")
12    raise SystemExit
13
14
15class RAMFS:
16
17    SEC_SIZE = 512
18
19    def __init__(self, blocks):
20        self.data = bytearray(blocks * self.SEC_SIZE)
21
22    def readblocks(self, n, buf):
23        # print("readblocks(%s, %x(%d))" % (n, id(buf), len(buf)))
24        for i in range(len(buf)):
25            buf[i] = self.data[n * self.SEC_SIZE + i]
26
27    def writeblocks(self, n, buf):
28        # print("writeblocks(%s, %x)" % (n, id(buf)))
29        for i in range(len(buf)):
30            self.data[n * self.SEC_SIZE + i] = buf[i]
31
32    def ioctl(self, op, arg):
33        # print("ioctl(%d, %r)" % (op, arg))
34        if op == 4:  # MP_BLOCKDEV_IOCTL_BLOCK_COUNT
35            return len(self.data) // self.SEC_SIZE
36        if op == 5:  # MP_BLOCKDEV_IOCTL_BLOCK_SIZE
37            return self.SEC_SIZE
38
39
40try:
41    bdev = RAMFS(50)
42except MemoryError:
43    print("SKIP")
44    raise SystemExit
45
46uos.VfsFat.mkfs(bdev)
47vfs = uos.VfsFat(bdev)
48uos.mount(vfs, "/ramdisk")
49uos.chdir("/ramdisk")
50
51try:
52    vfs.mkdir("foo_dir")
53except OSError as e:
54    print(e.args[0] == uerrno.EEXIST)
55
56try:
57    vfs.remove("foo_dir")
58except OSError as e:
59    print(e.args[0] == uerrno.EISDIR)
60
61try:
62    vfs.remove("no_file.txt")
63except OSError as e:
64    print(e.args[0] == uerrno.ENOENT)
65
66try:
67    vfs.rename("foo_dir", "/null/file")
68except OSError as e:
69    print(e.args[0] == uerrno.ENOENT)
70
71# file in dir
72with open("foo_dir/file-in-dir.txt", "w+t") as f:
73    f.write("data in file")
74
75with open("foo_dir/file-in-dir.txt", "r+b") as f:
76    print(f.read())
77
78with open("foo_dir/sub_file.txt", "w") as f:
79    f.write("subdir file")
80
81# directory not empty
82try:
83    vfs.rmdir("foo_dir")
84except OSError as e:
85    print(e.args[0] == uerrno.EACCES)
86
87# trim full path
88vfs.rename("foo_dir/file-in-dir.txt", "foo_dir/file.txt")
89print(list(vfs.ilistdir("foo_dir")))
90
91vfs.rename("foo_dir/file.txt", "moved-to-root.txt")
92print(list(vfs.ilistdir()))
93
94# check that renaming to existing file will overwrite it
95with open("temp", "w") as f:
96    f.write("new text")
97vfs.rename("temp", "moved-to-root.txt")
98print(list(vfs.ilistdir()))
99with open("moved-to-root.txt") as f:
100    print(f.read())
101
102# valid removes
103vfs.remove("foo_dir/sub_file.txt")
104vfs.rmdir("foo_dir")
105print(list(vfs.ilistdir()))
106
107# disk full
108try:
109    bsize = vfs.statvfs("/ramdisk")[0]
110    free = vfs.statvfs("/ramdisk")[2] + 1
111    f = open("large_file.txt", "wb")
112    f.write(bytearray(bsize * free))
113except OSError as e:
114    print("ENOSPC:", e.args[0] == 28)  # uerrno.ENOSPC
115