original development tree for Linux kernel GTP module; now long in mainline.
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/*
* 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,
.owner = THIS_MODULE,
};
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");