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/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 23static struct nls_table *tables; 24static 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 */ 30struct utf8_table { 31 int cmask; 32 int cval; 33 int shift; 34 long lmask; 35 long lval; 36}; 37 38static 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 49int 50utf8_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 79int 80utf8_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 } 103 } 104 return (op - pwcs); 105} 106 107int 108utf8_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 135int 136utf8_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 162int 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 185int 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 202static 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 215struct 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 245void unload_nls(struct nls_table *nls) 246{ 247 if (nls->owner) 248 __MOD_DEC_USE_COUNT(nls->owner); 249} 250 251wchar_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 334static 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 370static unsigned char *page_uni2charset[256] = { 371 page00 372}; 373 374static 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 410static 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 447static 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 464static 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 472static 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 */ 482struct 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 493EXPORT_SYMBOL(register_nls); 494EXPORT_SYMBOL(unregister_nls); 495EXPORT_SYMBOL(unload_nls); 496EXPORT_SYMBOL(load_nls); 497EXPORT_SYMBOL(load_nls_default); 498EXPORT_SYMBOL(utf8_mbtowc); 499EXPORT_SYMBOL(utf8_mbstowcs); 500EXPORT_SYMBOL(utf8_wctomb); 501EXPORT_SYMBOL(utf8_wcstombs); 502