fs/jfs/jfs_unicode.c

   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 }