[linux.git] / fs / nls / nls_utf8.c

/*
 * Module for handling utf8 just like any other charset.
 * By Urban Widmark 2000
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/nls.h>
#include <linux/errno.h>

static unsigned char identity[256];

static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
{
	int n;

	if (boundlen <= 0)
		return -ENAMETOOLONG;

	n = utf32_to_utf8(uni, out, boundlen);
	if (n < 0) {
		*out = '?';
		return -EINVAL;
	}
	return n;
}

static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
{
	int n;
	unicode_t u;

	n = utf8_to_utf32(rawstring, boundlen, &u);
	if (n < 0 || u > MAX_WCHAR_T) {
		*uni = 0x003f;	/* ? */
		return -EINVAL;
	}
	*uni = (wchar_t) u;
	return n;
}

static struct nls_table table = {
	.charset	= "utf8",
	.uni2char	= uni2char,
	.char2uni	= char2uni,
	.charset2lower	= identity,	/* no conversion */
	.charset2upper	= identity,
};

static int __init init_nls_utf8(void)
{
	int i;
	for (i=0; i<256; i++)
		identity[i] = i;

        return register_nls(&table);
}

static void __exit exit_nls_utf8(void)
{
        unregister_nls(&table);
}

module_init(init_nls_utf8)
module_exit(exit_nls_utf8)
MODULE_LICENSE("Dual BSD/GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Module for handling utf8 just like any other charset.
	3	* By Urban Widmark 2000
	4	*/
	5
	6	#include <linux/module.h>
	7	#include <linux/kernel.h>
	8	#include <linux/string.h>
	9	#include <linux/nls.h>
	10	#include <linux/errno.h>
	11
	12	static unsigned char identity[256];
	13
	14	static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
	15	{
	16	int n;
	17
74675a58 AS	18	if (boundlen <= 0)
	19	return -ENAMETOOLONG;
	20
	21	n = utf32_to_utf8(uni, out, boundlen);
	22	if (n < 0) {
1da177e4 LT	23	*out = '?';
	24	return -EINVAL;
	25	}
	26	return n;
	27	}
	28
	29	static int char2uni(const unsigned char rawstring, int boundlen, wchar_t uni)
	30	{
	31	int n;
74675a58	32	unicode_t u;
1da177e4	33
74675a58 AS	34	n = utf8_to_utf32(rawstring, boundlen, &u);
74675a58 AS	35	if (n < 0 \|\| u > MAX_WCHAR_T) {
1da177e4	36	uni = 0x003f; / ? */
74675a58	37	return -EINVAL;
1da177e4	38	}
74675a58	39	*uni = (wchar_t) u;
1da177e4 LT	40	return n;
	41	}
	42
	43	static struct nls_table table = {
	44	.charset = "utf8",
	45	.uni2char = uni2char,
	46	.char2uni = char2uni,
	47	.charset2lower = identity, /* no conversion */
	48	.charset2upper = identity,
1da177e4 LT	49	};
	50
	51	static int __init init_nls_utf8(void)
	52	{
	53	int i;
	54	for (i=0; i<256; i++)
	55	identity[i] = i;
	56
	57	return register_nls(&table);
	58	}
	59
	60	static void __exit exit_nls_utf8(void)
	61	{
	62	unregister_nls(&table);
	63	}
	64
	65	module_init(init_nls_utf8)
	66	module_exit(exit_nls_utf8)
	67	MODULE_LICENSE("Dual BSD/GPL");