File: /usr/src/linux/fs/nls/nls_base.c
1 /*
2 * linux/fs/nls.c
3 *
4 * Native language support--charsets and unicode translations.
5 * By Gordon Chaffee 1996, 1997
6 *
7 * Unicode based case conversion 1999 by Wolfram Pienkoss
8 *
9 */
10
11 #include <linux/version.h>
12 #include <linux/module.h>
13 #include <linux/string.h>
14 #include <linux/config.h>
15 #include <linux/nls.h>
16 #include <linux/slab.h>
17 #include <linux/errno.h>
18 #ifdef CONFIG_KMOD
19 #include <linux/kmod.h>
20 #endif
21 #include <linux/spinlock.h>
22
23 static struct nls_table *tables;
24 static spinlock_t nls_lock = SPIN_LOCK_UNLOCKED;
25
26 /*
27 * Sample implementation from Unicode home page.
28 * http://www.stonehand.com/unicode/standard/fss-utf.html
29 */
30 struct utf8_table {
31 int cmask;
32 int cval;
33 int shift;
34 long lmask;
35 long lval;
36 };
37
38 static struct utf8_table utf8_table[] =
39 {
40 {0x80, 0x00, 0*6, 0x7F, 0, /* 1 byte sequence */},
41 {0xE0, 0xC0, 1*6, 0x7FF, 0x80, /* 2 byte sequence */},
42 {0xF0, 0xE0, 2*6, 0xFFFF, 0x800, /* 3 byte sequence */},
43 {0xF8, 0xF0, 3*6, 0x1FFFFF, 0x10000, /* 4 byte sequence */},
44 {0xFC, 0xF8, 4*6, 0x3FFFFFF, 0x200000, /* 5 byte sequence */},
45 {0xFE, 0xFC, 5*6, 0x7FFFFFFF, 0x4000000, /* 6 byte sequence */},
46 {0, /* end of table */}
47 };
48
49 int
50 utf8_mbtowc(wchar_t *p, const __u8 *s, int n)
51 {
52 long l;
53 int c0, c, nc;
54 struct utf8_table *t;
55
56 nc = 0;
57 c0 = *s;
58 l = c0;
59 for (t = utf8_table; t->cmask; t++) {
60 nc++;
61 if ((c0 & t->cmask) == t->cval) {
62 l &= t->lmask;
63 if (l < t->lval)
64 return -1;
65 *p = l;
66 return nc;
67 }
68 if (n <= nc)
69 return -1;
70 s++;
71 c = (*s ^ 0x80) & 0xFF;
72 if (c & 0xC0)
73 return -1;
74 l = (l << 6) | c;
75 }
76 return -1;
77 }
78
79 int
80 utf8_mbstowcs(wchar_t *pwcs, const __u8 *s, int n)
81 {
82 __u16 *op;
83 const __u8 *ip;
84 int size;
85
86 op = pwcs;
87 ip = s;
88 while (*ip && n > 0) {
89 if (*ip & 0x80) {
90 size = utf8_mbtowc(op, ip, n);
91 if (size == -1) {
92 /* Ignore character and move on */
93 ip++;
94 n--;
95 } else {
96 op += size;
97 ip += size;
98 n -= size;
99 }
100 } else {
101 *op++ = *ip++;
102 }
103 }
104 return (op - pwcs);
105 }
106
107 int
108 utf8_wctomb(__u8 *s, wchar_t wc, int maxlen)
109 {
110 long l;
111 int c, nc;
112 struct utf8_table *t;
113
114 if (s == 0)
115 return 0;
116
117 l = wc;
118 nc = 0;
119 for (t = utf8_table; t->cmask && maxlen; t++, maxlen--) {
120 nc++;
121 if (l <= t->lmask) {
122 c = t->shift;
123 *s = t->cval | (l >> c);
124 while (c > 0) {
125 c -= 6;
126 s++;
127 *s = 0x80 | ((l >> c) & 0x3F);
128 }
129 return nc;
130 }
131 }
132 return -1;
133 }
134
135 int
136 utf8_wcstombs(__u8 *s, const wchar_t *pwcs, int maxlen)
137 {
138 const __u16 *ip;
139 __u8 *op;
140 int size;
141
142 op = s;
143 ip = pwcs;
144 while (*ip && maxlen > 0) {
145 if (*ip > 0x7f) {
146 size = utf8_wctomb(op, *ip, maxlen);
147 if (size == -1) {
148 /* Ignore character and move on */
149 maxlen--;
150 } else {
151 op += size;
152 maxlen -= size;
153 }
154 } else {
155 *op++ = (__u8) *ip;
156 }
157 ip++;
158 }
159 return (op - s);
160 }
161
162 int register_nls(struct nls_table * nls)
163 {
164 struct nls_table ** tmp = &tables;
165
166 if (!nls)
167 return -EINVAL;
168 if (nls->next)
169 return -EBUSY;
170
171 spin_lock(&nls_lock);
172 while (*tmp) {
173 if (nls == *tmp) {
174 spin_unlock(&nls_lock);
175 return -EBUSY;
176 }
177 tmp = &(*tmp)->next;
178 }
179 nls->next = tables;
180 tables = nls;
181 spin_unlock(&nls_lock);
182 return 0;
183 }
184
185 int unregister_nls(struct nls_table * nls)
186 {
187 struct nls_table ** tmp = &tables;
188
189 spin_lock(&nls_lock);
190 while (*tmp) {
191 if (nls == *tmp) {
192 *tmp = nls->next;
193 spin_unlock(&nls_lock);
194 return 0;
195 }
196 tmp = &(*tmp)->next;
197 }
198 spin_unlock(&nls_lock);
199 return -EINVAL;
200 }
201
202 static struct nls_table *find_nls(char *charset)
203 {
204 struct nls_table *nls;
205 spin_lock(&nls_lock);
206 for (nls = tables; nls; nls = nls->next)
207 if (! strcmp(nls->charset, charset))
208 break;
209 if (nls && !try_inc_mod_count(nls->owner))
210 nls = NULL;
211 spin_unlock(&nls_lock);
212 return nls;
213 }
214
215 struct nls_table *load_nls(char *charset)
216 {
217 struct nls_table *nls;
218 #ifdef CONFIG_KMOD
219 char buf[40];
220 int ret;
221 #endif
222
223 nls = find_nls(charset);
224 if (nls)
225 return nls;
226
227 #ifdef CONFIG_KMOD
228 if (strlen(charset) > sizeof(buf) - sizeof("nls_")) {
229 printk("Unable to load NLS charset %s: name too long\n",
230 charset);
231 return NULL;
232 }
233
234 sprintf(buf, "nls_%s", charset);
235 ret = request_module(buf);
236 if (ret != 0) {
237 printk("Unable to load NLS charset %s\n", charset);
238 return NULL;
239 }
240 nls = find_nls(charset);
241 #endif
242 return nls;
243 }
244
245 void unload_nls(struct nls_table *nls)
246 {
247 if (nls->owner)
248 __MOD_DEC_USE_COUNT(nls->owner);
249 }
250
251 wchar_t charset2uni[256] = {
252 /* 0x00*/
253 0x0000, 0x0001, 0x0002, 0x0003,
254 0x0004, 0x0005, 0x0006, 0x0007,
255 0x0008, 0x0009, 0x000a, 0x000b,
256 0x000c, 0x000d, 0x000e, 0x000f,
257 /* 0x10*/
258 0x0010, 0x0011, 0x0012, 0x0013,
259 0x0014, 0x0015, 0x0016, 0x0017,
260 0x0018, 0x0019, 0x001a, 0x001b,
261 0x001c, 0x001d, 0x001e, 0x001f,
262 /* 0x20*/
263 0x0020, 0x0021, 0x0022, 0x0023,
264 0x0024, 0x0025, 0x0026, 0x0027,
265 0x0028, 0x0029, 0x002a, 0x002b,
266 0x002c, 0x002d, 0x002e, 0x002f,
267 /* 0x30*/
268 0x0030, 0x0031, 0x0032, 0x0033,
269 0x0034, 0x0035, 0x0036, 0x0037,
270 0x0038, 0x0039, 0x003a, 0x003b,
271 0x003c, 0x003d, 0x003e, 0x003f,
272 /* 0x40*/
273 0x0040, 0x0041, 0x0042, 0x0043,
274 0x0044, 0x0045, 0x0046, 0x0047,
275 0x0048, 0x0049, 0x004a, 0x004b,
276 0x004c, 0x004d, 0x004e, 0x004f,
277 /* 0x50*/
278 0x0050, 0x0051, 0x0052, 0x0053,
279 0x0054, 0x0055, 0x0056, 0x0057,
280 0x0058, 0x0059, 0x005a, 0x005b,
281 0x005c, 0x005d, 0x005e, 0x005f,
282 /* 0x60*/
283 0x0060, 0x0061, 0x0062, 0x0063,
284 0x0064, 0x0065, 0x0066, 0x0067,
285 0x0068, 0x0069, 0x006a, 0x006b,
286 0x006c, 0x006d, 0x006e, 0x006f,
287 /* 0x70*/
288 0x0070, 0x0071, 0x0072, 0x0073,
289 0x0074, 0x0075, 0x0076, 0x0077,
290 0x0078, 0x0079, 0x007a, 0x007b,
291 0x007c, 0x007d, 0x007e, 0x007f,
292 /* 0x80*/
293 0x0080, 0x0081, 0x0082, 0x0083,
294 0x0084, 0x0085, 0x0086, 0x0087,
295 0x0088, 0x0089, 0x008a, 0x008b,
296 0x008c, 0x008d, 0x008e, 0x008f,
297 /* 0x90*/
298 0x0090, 0x0091, 0x0092, 0x0093,
299 0x0094, 0x0095, 0x0096, 0x0097,
300 0x0098, 0x0099, 0x009a, 0x009b,
301 0x009c, 0x009d, 0x009e, 0x009f,
302 /* 0xa0*/
303 0x00a0, 0x00a1, 0x00a2, 0x00a3,
304 0x00a4, 0x00a5, 0x00a6, 0x00a7,
305 0x00a8, 0x00a9, 0x00aa, 0x00ab,
306 0x00ac, 0x00ad, 0x00ae, 0x00af,
307 /* 0xb0*/
308 0x00b0, 0x00b1, 0x00b2, 0x00b3,
309 0x00b4, 0x00b5, 0x00b6, 0x00b7,
310 0x00b8, 0x00b9, 0x00ba, 0x00bb,
311 0x00bc, 0x00bd, 0x00be, 0x00bf,
312 /* 0xc0*/
313 0x00c0, 0x00c1, 0x00c2, 0x00c3,
314 0x00c4, 0x00c5, 0x00c6, 0x00c7,
315 0x00c8, 0x00c9, 0x00ca, 0x00cb,
316 0x00cc, 0x00cd, 0x00ce, 0x00cf,
317 /* 0xd0*/
318 0x00d0, 0x00d1, 0x00d2, 0x00d3,
319 0x00d4, 0x00d5, 0x00d6, 0x00d7,
320 0x00d8, 0x00d9, 0x00da, 0x00db,
321 0x00dc, 0x00dd, 0x00de, 0x00df,
322 /* 0xe0*/
323 0x00e0, 0x00e1, 0x00e2, 0x00e3,
324 0x00e4, 0x00e5, 0x00e6, 0x00e7,
325 0x00e8, 0x00e9, 0x00ea, 0x00eb,
326 0x00ec, 0x00ed, 0x00ee, 0x00ef,
327 /* 0xf0*/
328 0x00f0, 0x00f1, 0x00f2, 0x00f3,
329 0x00f4, 0x00f5, 0x00f6, 0x00f7,
330 0x00f8, 0x00f9, 0x00fa, 0x00fb,
331 0x00fc, 0x00fd, 0x00fe, 0x00ff,
332 };
333
334 static unsigned char page00[256] = {
335 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
336 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
337 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
338 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
339 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
340 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
341 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
342 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
343 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
344 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
345 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
346 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
347 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
348 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
349 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
350 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
351
352 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
353 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
354 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
355 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
356 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
357 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
358 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
359 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
360 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
361 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
362 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
363 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
364 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
365 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
366 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
367 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
368 };
369
370 static unsigned char *page_uni2charset[256] = {
371 page00
372 };
373
374 static unsigned char charset2lower[256] = {
375 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
376 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
377 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
378 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
379 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
380 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
381 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
382 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
383 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
384 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
385 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
386 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
387 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
388 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
389 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
390 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
391
392 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
393 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
394 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
395 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
396 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
397 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
398 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
399 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
400 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
401 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
402 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
403 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
404 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
405 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
406 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
407 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
408 };
409
410 static unsigned char charset2upper[256] = {
411 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
412 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
413 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
414 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
415 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
416 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
417 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
418 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
419 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
420 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
421 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
422 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
423 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
424 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
425 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
426 0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
427
428 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
429 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
430 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
431 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
432 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
433 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
434 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
435 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
436 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
437 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
438 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
439 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
440 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
441 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
442 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
443 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
444 };
445
446
447 static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
448 {
449 unsigned char *uni2charset;
450 unsigned char cl = uni & 0x00ff;
451 unsigned char ch = (uni & 0xff00) >> 8;
452
453 if (boundlen <= 0)
454 return -ENAMETOOLONG;
455
456 uni2charset = page_uni2charset[ch];
457 if (uni2charset && uni2charset[cl])
458 out[0] = uni2charset[cl];
459 else
460 return -EINVAL;
461 return 1;
462 }
463
464 static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
465 {
466 *uni = charset2uni[*rawstring];
467 if (*uni == 0x0000)
468 return -EINVAL;
469 return 1;
470 }
471
472 static struct nls_table default_table = {
473 "default",
474 uni2char,
475 char2uni,
476 charset2lower,
477 charset2upper,
478 NULL,
479 };
480
481 /* Returns a simple default translation table */
482 struct nls_table *load_nls_default(void)
483 {
484 struct nls_table *default_nls;
485
486 default_nls = load_nls(CONFIG_NLS_DEFAULT);
487 if (default_nls != NULL)
488 return default_nls;
489 else
490 return &default_table;
491 }
492
493 EXPORT_SYMBOL(register_nls);
494 EXPORT_SYMBOL(unregister_nls);
495 EXPORT_SYMBOL(unload_nls);
496 EXPORT_SYMBOL(load_nls);
497 EXPORT_SYMBOL(load_nls_default);
498 EXPORT_SYMBOL(utf8_mbtowc);
499 EXPORT_SYMBOL(utf8_mbstowcs);
500 EXPORT_SYMBOL(utf8_wctomb);
501 EXPORT_SYMBOL(utf8_wcstombs);
502