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