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 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 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 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 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 } 159 160 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 } 180 181 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 } 197 198 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 } 213 214 struct nls_table *load_nls(char *charset) 215 { 216 return try_then_request_module(find_nls(charset), "nls_%s", charset); 217 } 218 219 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 }; 418 419 420 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 } 436 437 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 */ 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