fs/jfs/jfs_unicode.c

Source file repositories/reference/linux-study-clean/fs/jfs/jfs_unicode.c

File Facts

System
Linux kernel
Corpus path
fs/jfs/jfs_unicode.c
Extension
.c
Size
2657 bytes
Lines
126
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

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;
}

Annotation

Implementation Notes