84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
/*
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* linux/fs/nls_koi8-ru.c
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*
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* Charset koi8-ru translation based on charset koi8-u.
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* The Unicode to charset table has only exact mappings.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/nls.h>
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#include <linux/errno.h>
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static struct nls_table *p_nls;
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static int uni2char(const wchar_t uni,
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unsigned char *out, int boundlen)
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{
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if (boundlen <= 0)
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return -ENAMETOOLONG;
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if ((uni & 0xffaf) == 0x040e || (uni & 0xffce) == 0x254c) {
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/* koi8-ru and koi8-u differ only on two characters */
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if (uni == 0x040e)
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out[0] = 0xbe;
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else if (uni == 0x045e)
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out[0] = 0xae;
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else if (uni == 0x255d || uni == 0x256c)
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return 0;
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else
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return p_nls->uni2char(uni, out, boundlen);
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return 1;
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}
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else
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/* fast path */
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return p_nls->uni2char(uni, out, boundlen);
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}
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static int char2uni(const unsigned char *rawstring, int boundlen,
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wchar_t *uni)
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{
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int n;
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if ((*rawstring & 0xef) != 0xae) {
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/* koi8-ru and koi8-u differ only on two characters */
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*uni = (*rawstring & 0x10) ? 0x040e : 0x045e;
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return 1;
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}
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n = p_nls->char2uni(rawstring, boundlen, uni);
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return n;
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}
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static struct nls_table table = {
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.charset = "koi8-ru",
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.uni2char = uni2char,
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.char2uni = char2uni,
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.owner = THIS_MODULE,
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};
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static int __init init_nls_koi8_ru(void)
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{
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p_nls = load_nls("koi8-u");
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if (p_nls) {
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table.charset2upper = p_nls->charset2upper;
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table.charset2lower = p_nls->charset2lower;
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return register_nls(&table);
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}
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return -EINVAL;
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}
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static void __exit exit_nls_koi8_ru(void)
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{
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unregister_nls(&table);
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unload_nls(p_nls);
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}
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module_init(init_nls_koi8_ru)
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module_exit(exit_nls_koi8_ru)
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MODULE_LICENSE("Dual BSD/GPL");
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