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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) International Business Machines Corp., 2000-2004
*/
#include <linux/fs.h>
#include <linux/slab.h>
#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_unicode.h"
#include "jfs_debug.h"
/*
* NAME: jfs_strfromUCS()
*
* FUNCTION: Convert little-endian unicode string to character string
*
*/
int jfs_strfromUCS_le(char *to, const __le16 * from,
int len, struct nls_table *codepage)
{
int i;
int outlen = 0;
static int warn_again = 5; /* Only warn up to 5 times total */
int warn = !!warn_again; /* once per string */
if (codepage) {
for (i = 0; (i < len) && from[i]; i++) {
int charlen;
charlen =
codepage->uni2char(le16_to_cpu(from[i]),
&to[outlen],
NLS_MAX_CHARSET_SIZE);
if (charlen > 0)
outlen += charlen;
else
to[outlen++] = '?';
}
} else {
for (i = 0; (i < len) && from[i]; i++) {
if (unlikely(le16_to_cpu(from[i]) & 0xff00)) {
to[i] = '?';
if (unlikely(warn)) {
warn--;
warn_again--;
printk(KERN_ERR
"non-latin1 character 0x%x found in JFS file name\n",
le16_to_cpu(from[i]));
printk(KERN_ERR
"mount with iocharset=utf8 to access\n");
}
}
else
to[i] = (char) (le16_to_cpu(from[i]));
}
outlen = i;
}
to[outlen] = 0;
return outlen;
}
/*
* NAME: jfs_strtoUCS()
*
* FUNCTION: Convert character string to unicode string
*
*/
static int jfs_strtoUCS(wchar_t * to, const unsigned char *from, int len,
struct nls_table *codepage)
{
int charlen;
int i;
if (codepage) {
for (i = 0; len && *from; i++, from += charlen, len -= charlen)
{
charlen = codepage->char2uni(from, len, &to[i]);
if (charlen < 1) {
jfs_err("jfs_strtoUCS: char2uni returned %d.",
charlen);
jfs_err("charset = %s, char = 0x%x",
codepage->charset, *from);
return charlen;
}
}
} else {
for (i = 0; (i < len) && from[i]; i++)
to[i] = (wchar_t) from[i];
}
to[i] = 0;
return i;
}
/*
* NAME: get_UCSname()
*
* FUNCTION: Allocate and translate to unicode string
*
*/
int get_UCSname(struct component_name * uniName, struct dentry *dentry)
{
struct nls_table *nls_tab = JFS_SBI(dentry->d_sb)->nls_tab;
int length = dentry->d_name.len;
if (length > JFS_NAME_MAX)
return -ENAMETOOLONG;
uniName->name =
kmalloc_array(length + 1, sizeof(wchar_t), GFP_NOFS);
if (uniName->name == NULL)
return -ENOMEM;
uniName->namlen = jfs_strtoUCS(uniName->name, dentry->d_name.name,
length, nls_tab);
if (uniName->namlen < 0) {
kfree(uniName->name);
return uniName->namlen;
}
return 0;
}
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