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