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(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(length + 1, sizeof(wchar_t), GFP_NOFS);
112
113 if (uniName->name == NULL)
114 return -ENOMEM;
115
116 uniName->namlen = jfs_strtoUCS(uniName->name, dentry->d_name.name,
117 length, nls_tab);
118
119 if (uniName->namlen < 0) {
120 kfree(uniName->name);
121 return uniName->namlen;
122 }
123
124 return 0;
125 }
126
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