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