1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) International Business Machines Corp., 2000-2004 |
4 | */ |
5 | |
6 | #include <linux/fs.h> |
7 | #include <linux/slab.h> |
8 | #include "jfs_incore.h" |
9 | #include "jfs_filsys.h" |
10 | #include "jfs_unicode.h" |
11 | #include "jfs_debug.h" |
12 | |
13 | /* |
14 | * NAME: jfs_strfromUCS() |
15 | * |
16 | * FUNCTION: Convert little-endian unicode string to character string |
17 | * |
18 | */ |
19 | int jfs_strfromUCS_le(char *to, const __le16 * from, |
20 | int len, struct nls_table *codepage) |
21 | { |
22 | int i; |
23 | int outlen = 0; |
24 | static int warn_again = 5; /* Only warn up to 5 times total */ |
25 | int warn = !!warn_again; /* once per string */ |
26 | |
27 | if (codepage) { |
28 | for (i = 0; (i < len) && from[i]; i++) { |
29 | int charlen; |
30 | charlen = |
31 | codepage->uni2char(le16_to_cpu(from[i]), |
32 | &to[outlen], |
33 | NLS_MAX_CHARSET_SIZE); |
34 | if (charlen > 0) |
35 | outlen += charlen; |
36 | else |
37 | to[outlen++] = '?'; |
38 | } |
39 | } else { |
40 | for (i = 0; (i < len) && from[i]; i++) { |
41 | if (unlikely(le16_to_cpu(from[i]) & 0xff00)) { |
42 | to[i] = '?'; |
43 | if (unlikely(warn)) { |
44 | warn--; |
45 | warn_again--; |
46 | printk(KERN_ERR |
47 | "non-latin1 character 0x%x found in JFS file name\n" , |
48 | le16_to_cpu(from[i])); |
49 | printk(KERN_ERR |
50 | "mount with iocharset=utf8 to access\n" ); |
51 | } |
52 | |
53 | } |
54 | else |
55 | to[i] = (char) (le16_to_cpu(from[i])); |
56 | } |
57 | outlen = i; |
58 | } |
59 | to[outlen] = 0; |
60 | return outlen; |
61 | } |
62 | |
63 | /* |
64 | * NAME: jfs_strtoUCS() |
65 | * |
66 | * FUNCTION: Convert character string to unicode string |
67 | * |
68 | */ |
69 | static int jfs_strtoUCS(wchar_t * to, const unsigned char *from, int len, |
70 | struct nls_table *codepage) |
71 | { |
72 | int charlen; |
73 | int i; |
74 | |
75 | if (codepage) { |
76 | for (i = 0; len && *from; i++, from += charlen, len -= charlen) |
77 | { |
78 | charlen = codepage->char2uni(from, len, &to[i]); |
79 | if (charlen < 1) { |
80 | jfs_err("jfs_strtoUCS: char2uni returned %d." , |
81 | charlen); |
82 | jfs_err("charset = %s, char = 0x%x" , |
83 | codepage->charset, *from); |
84 | return charlen; |
85 | } |
86 | } |
87 | } else { |
88 | for (i = 0; (i < len) && from[i]; i++) |
89 | to[i] = (wchar_t) from[i]; |
90 | } |
91 | |
92 | to[i] = 0; |
93 | return i; |
94 | } |
95 | |
96 | /* |
97 | * NAME: get_UCSname() |
98 | * |
99 | * FUNCTION: Allocate and translate to unicode string |
100 | * |
101 | */ |
102 | int get_UCSname(struct component_name * uniName, struct dentry *dentry) |
103 | { |
104 | struct nls_table *nls_tab = JFS_SBI(sb: dentry->d_sb)->nls_tab; |
105 | int length = dentry->d_name.len; |
106 | |
107 | if (length > JFS_NAME_MAX) |
108 | return -ENAMETOOLONG; |
109 | |
110 | uniName->name = |
111 | kmalloc_array(n: length + 1, size: sizeof(wchar_t), GFP_NOFS); |
112 | |
113 | if (uniName->name == NULL) |
114 | return -ENOMEM; |
115 | |
116 | uniName->namlen = jfs_strtoUCS(to: uniName->name, from: dentry->d_name.name, |
117 | len: length, codepage: nls_tab); |
118 | |
119 | if (uniName->namlen < 0) { |
120 | kfree(objp: uniName->name); |
121 | return uniName->namlen; |
122 | } |
123 | |
124 | return 0; |
125 | } |
126 | |