libc/string/_collate.c

   1 /*
   2  * Copyright (C) 2002     Manuel Novoa III
   3  * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
   4  *
   5  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   6  */
   7
   8 /*  Dec 20, 2002
   9  *  Initial test implementation of strcoll, strxfrm, wcscoll, and wcsxfrm.
  10  *  The code needs to be cleaned up a good bit, but I'd like to see people
  11  *  test it out.
  12  *
  13  */
  14
  15 #include "_string.h"
  16 #include <ctype.h>
  17 #include <locale.h>
  18 #include <stdlib.h>
  19 #include <errno.h>
  20 #include <assert.h>
  21
  22 #ifdef __UCLIBC_HAS_LOCALE__
  23 #if defined(L_strxfrm) || defined(L_strxfrm_l) || defined(L_wcsxfrm) || defined(L_wcsxfrm_l)
  24
  25 #ifdef L_strxfrm
  26 #ifndef WANT_WIDE
  27 #error WANT_WIDE should be defined for L_strxfrm
  28 #endif
  29 #ifdef L_wcsxfrm
  30 #error L_wcsxfrm already defined for L_strxfrm
  31 #endif
  32 #endif /* L_strxfrm */
  33
  34 #if defined(L_strxfrm) || defined(L_strxfrm_l)
  35
  36 #define wcscoll   strcoll
  37 #define wcscoll_l strcoll_l
  38 #define wcsxfrm   strxfrm
  39 #define wcsxfrm_l strxfrm_l
  40
  41 #undef WANT_WIDE
  42 #undef Wvoid
  43 #undef Wchar
  44 #undef Wuchar
  45 #undef Wint
  46
  47 #define Wchar char
  48
  49 #endif /* defined(L_strxfrm) || defined(L_strxfrm_l) */
  50
  51 #if defined(__UCLIBC_HAS_XLOCALE__) && !defined(__UCLIBC_DO_XLOCALE)
  52
  53
  54 int wcscoll (const Wchar *s0, const Wchar *s1)
  55 {
  56         return wcscoll_l(s0, s1, __UCLIBC_CURLOCALE );
  57 }
  58 libc_hidden_def(wcscoll)
  59
  60
  61 size_t wcsxfrm(Wchar *__restrict ws1, const Wchar *__restrict ws2, size_t n)
  62 {
  63         return wcsxfrm_l(ws1, ws2, n, __UCLIBC_CURLOCALE );
  64 }
  65 libc_hidden_def(wcsxfrm)
  66
  67 #else  /* defined(__UCLIBC_HAS_XLOCALE__) && !defined(__UCLIBC_DO_XLOCALE) */
  68
  69
  70 #if 0
  71 #define CUR_COLLATE (&__UCLIBC_CURLOCALE->collate)
  72 #else
  73 #define CUR_COLLATE (& __LOCALE_PTR->collate)
  74 #endif
  75
  76 #define MAX_PENDING 8
  77
  78 typedef struct {
  79         const Wchar *s;
  80         const Wchar *eob;                       /* end of backward */
  81
  82         __uwchar_t weight;
  83         __uwchar_t ui_weight;           /* undefined or invalid */
  84         int colitem;
  85         int weightidx;
  86         int rule;
  87         size_t position;
  88         /* should be wchar_t.  if wchar < 0 do EILSEQ? */
  89         __uwchar_t *cip;
  90         __uwchar_t ci_pending[MAX_PENDING];     /* nul-terminated */
  91
  92         char *back_buf;
  93         char *bbe;                                      /* end of back_buf (actual last... not 1 past end) */
  94         char *bp;                                       /* ptr into backbuf, NULL if not in backward mode */
  95         char ibb[128];
  96         size_t bb_size;
  97
  98         int ru_pushed;
  99 } col_state_t;
 100
 101
 102 #define WEIGHT_MASK     0x3fffU
 103 #define RULE_MASK       0xc000U
 104
 105 #define RULE_FORWARD  (1 << 14)
 106 #define RULE_POSITION (1 << 15)
 107
 108 #define UI_IDX          (WEIGHT_MASK-6)
 109 #define POSIT_IDX       (WEIGHT_MASK-5)
 110 #define RANGE_IDX       (WEIGHT_MASK-4)
 111 #define UNDEF_IDX       (WEIGHT_MASK-3)
 112 #define INVAL_IDX       (WEIGHT_MASK-2)
 113 #define DITTO_IDX   (WEIGHT_MASK-1)
 114
 115
 116 #undef TRACE
 117 #if 0
 118 #define TRACE(X)        printf X
 119 #else
 120 #define TRACE(X)        ((void)0)
 121 #endif
 122
 123 static int lookup(wchar_t wc   __LOCALE_PARAM )
 124 {
 125         unsigned int sc, n, i0, i1;
 126
 127         if (((__uwchar_t) wc) > 0xffffU) {
 128                 return 0;
 129         }
 130
 131         sc = wc & CUR_COLLATE->ti_mask;
 132         wc >>= CUR_COLLATE->ti_shift;
 133         n = wc & CUR_COLLATE->ii_mask;
 134         wc >>= CUR_COLLATE->ii_shift;
 135
 136         i0 = CUR_COLLATE->wcs2colidt_tbl[wc];
 137         i0 <<= CUR_COLLATE->ii_shift;
 138         i1 = CUR_COLLATE->wcs2colidt_tbl[CUR_COLLATE->ii_len + i0 + n];
 139         i1 <<= CUR_COLLATE->ti_shift;
 140         return CUR_COLLATE->wcs2colidt_tbl[CUR_COLLATE->ii_len + CUR_COLLATE->ti_len + i1 + sc];
 141
 142 }
 143
 144 static void init_col_state(col_state_t *cs, const Wchar *wcs)
 145 {
 146         memset(cs, 0, sizeof(col_state_t));
 147         cs->s = wcs;
 148         cs->bp = cs->back_buf = cs->ibb;
 149         cs->bb_size = 128;
 150         cs->bbe = cs->back_buf + (cs->bb_size -1);
 151 }
 152
 153 static void next_weight(col_state_t *cs, int pass   __LOCALE_PARAM )
 154 {
 155         int r, w, ru, ri, popping_backup_stack;
 156         ssize_t n;
 157         const uint16_t *p;
 158 #ifdef WANT_WIDE
 159 #define WC (*cs->s)
 160 #define N (1)
 161 #else  /* WANT_WIDE */
 162         wchar_t WC;
 163         size_t n0, nx;
 164 #define N n0
 165
 166 #endif /* WANT_WIDE */
 167
 168         do {
 169
 170                 if (cs->ru_pushed) {
 171                         ru = cs->ru_pushed;
 172                         TRACE(("ru_pushed = %d\n", ru));
 173                         cs->ru_pushed = 0;
 174                         goto POSITION_SKIP;
 175                 }
 176
 177 #ifdef __UCLIBC_MJN3_ONLY__
 178 #warning should we walk pendings backwards?
 179 #endif
 180                 if (cs->cip) {                  /* possible pending weight */
 181                         if ((r = *(cs->cip++)) == 0) {
 182                                 cs->cip = NULL;
 183                                 continue;
 184                         }
 185                         cs->weightidx = r & WEIGHT_MASK;
 186                         assert(cs->weightidx);
 187 /*                      assert(cs->weightidx != WEIGHT_MASK); */
 188                 } else {                                /* get the next collation item from the string */
 189                         TRACE(("clearing popping flag\n"));
 190                         popping_backup_stack = 0;
 191
 192                 IGNORE_LOOP:
 193                         /* keep first pos as 0 for a sentinal */
 194                         if (*cs->bp) {                          /* pending backward chars */
 195                         POP_BACKUP:
 196                                 popping_backup_stack = 1;
 197                                 TRACE(("setting popping flag\n"));
 198                                 n = 0;
 199                                 if (*cs->bp > 0) {              /* singles pending */
 200                                         cs->s -= 1;
 201                                         if ((*cs->bp -= 1) == 0) {
 202                                                 cs->bp -= 1;
 203                                         }
 204                                 } else {                                /* last was a multi */
 205                                         cs->s += *cs->bp;
 206                                         cs->bp -= 1;
 207                                 }
 208                         } else if (!*cs->s) { /* not in backward mode and end of string */
 209                                 cs->weight = 0;
 210                                 return;
 211                         } else {
 212                                 cs->position += 1;
 213                         }
 214
 215                 BACK_LOOP:
 216 #ifdef WANT_WIDE
 217                         n = 1;
 218                         cs->colitem = r = lookup(*cs->s   __LOCALE_ARG );
 219 #else  /* WANT_WIDE */
 220                         n = n0 = __locale_mbrtowc_l(&WC, cs->s, __LOCALE_PTR);
 221                         if (n < 0) {
 222                                 __set_errno(EILSEQ);
 223                                 cs->weight = 0;
 224                                 return;
 225                         }
 226                         cs->colitem = r = lookup(WC   __LOCALE_ARG );
 227 #endif /* WANT_WIDE */
 228
 229                         TRACE((" r=%d WC=%#lx\n", r, (unsigned long)(WC)));
 230
 231                         if (r > CUR_COLLATE->max_col_index) { /* starting char for one or more sequences */
 232                                 p = CUR_COLLATE->multistart_tbl;
 233                                 p += p[r-CUR_COLLATE->max_col_index -1];
 234                                 do {
 235                                         n = N;
 236                                         r = *p++;
 237                                         do {
 238                                                 if (!*p) {              /* found it */
 239                                                         cs->colitem = r;
 240                                                         TRACE(("    found multi %d\n", n));
 241                                                         goto FOUND;
 242                                                 }
 243 #ifdef WANT_WIDE
 244                                                 /* the lookup check here is safe since we're assured that *p is a valid colidx */
 245                                                 if (!cs->s[n] || (lookup(cs->s[n]   __LOCALE_ARG ) != *p)) {
 246                                                         do {} while (*p++);
 247                                                         break;
 248                                                 }
 249                                                 ++p;
 250                                                 ++n;
 251 #else  /* WANT_WIDE */
 252                                                 if (cs->s[n]) {
 253                                                         nx = __locale_mbrtowc_l(&WC, cs->s + n, __LOCALE_PTR);
 254                                                         if (nx < 0) {
 255                                                                 __set_errno(EILSEQ);
 256                                                                 cs->weight = 0;
 257                                                                 return;
 258                                                         }
 259                                                 }
 260                                                 if (!cs->s[n] || (lookup(WC   __LOCALE_ARG ) != *p)) {
 261                                                         do {} while (*p++);
 262                                                         break;
 263                                                 }
 264                                                 ++p;
 265                                                 n += nx; /* Only gets here if cs->s[n] != 0, so nx is set. */
 266 #endif /* WANT_WIDE */
 267                                         } while (1);
 268                                 } while (1);
 269                         } else if (r == 0) {            /* illegal, undefined, or part of a range */
 270                                 if ((CUR_COLLATE->range_count)
 271 #ifdef __UCLIBC_MJN3_ONLY__
 272 #warning .. need to introduce range as a collating item?
 273 #endif
 274                                         && (((__uwchar_t)(WC - CUR_COLLATE->range_low)) <= CUR_COLLATE->range_count)
 275                                         ) {                                     /* part of a range */
 276                                         /* Note: cs->colitem = 0 already. */
 277                                         TRACE(("    found range\n"));
 278                                         ru = CUR_COLLATE->ruletable[CUR_COLLATE->range_rule_offset*CUR_COLLATE->MAX_WEIGHTS + pass];
 279                                         assert((ru & WEIGHT_MASK) != DITTO_IDX);
 280                                         if ((ru & WEIGHT_MASK) == WEIGHT_MASK) {
 281                                                 ru = (ru & RULE_MASK) | RANGE_IDX;
 282                                                 cs->weight = CUR_COLLATE->range_base_weight + (WC - CUR_COLLATE->range_low);
 283                                         }
 284                                         goto RANGE_SKIP_TO;
 285                                 } else if (((__uwchar_t)(WC)) <= 0x7fffffffUL) { /* legal but undefined */
 286                                 UNDEFINED:
 287                                         /* Note: cs->colitem = 0 already. */
 288                                         ri = CUR_COLLATE->undefined_idx;
 289                                         assert(ri != 0); /* implicit undefined isn't supported */
 290
 291                                         TRACE(("    found explicit UNDEFINED\n"));
 292 #ifdef __UCLIBC_MJN3_ONLY__
 293 #warning right now single weight locales do not support ..
 294 #endif
 295                                         if (CUR_COLLATE->num_weights == 1) {
 296                                                 TRACE(("    single weight UNDEFINED\n"));
 297                                                 cs->weightidx = RANGE_IDX;
 298                                                 cs->weight = ri;
 299                                                 cs->s += n;
 300                                                 goto PROCESS_WEIGHT;
 301                                         }
 302
 303                                         ri = CUR_COLLATE->index2ruleidx[ri - 1];
 304                                         ru = CUR_COLLATE->ruletable[ri * CUR_COLLATE->MAX_WEIGHTS + pass];
 305                                         assert((ru & WEIGHT_MASK) != WEIGHT_MASK); /* TODO: handle ".." */
 306                                         if ((ru & WEIGHT_MASK) == DITTO_IDX) {
 307                                                 cs->colitem = CUR_COLLATE->undefined_idx;
 308                                         }
 309                                         goto RANGE_SKIP_TO;
 310                                 } else {                /* illegal */
 311                                         TRACE(("    found illegal\n"));
 312                                         __set_errno(EINVAL);
 313                                         /* We put all illegals in the same equiv class with maximal weight,
 314                                          * and ignore them after the first pass. */
 315                                         if (pass > 0) {
 316                                                 cs->s += n;
 317                                                 goto IGNORE_LOOP;
 318                                         }
 319                                         ru = (RULE_FORWARD | RANGE_IDX);
 320                                         cs->weight = 0xffffU;
 321                                         goto RANGE_SKIP_TO;
 322                                 }
 323                         } else if (CUR_COLLATE->num_weights == 1) {
 324                                 TRACE(("    single weight\n"));
 325                                 cs->weightidx = RANGE_IDX;
 326                                 cs->weight = cs->colitem;
 327                                 cs->s += n;
 328                                 goto PROCESS_WEIGHT;
 329                         } else {
 330                                 TRACE(("    normal\n"));
 331                         }
 332
 333                         /* if we get here, it is a normal char either singlely weighted, undefined, or in a range */
 334                 FOUND:
 335                         ri = CUR_COLLATE->index2ruleidx[cs->colitem - 1];
 336                         TRACE((" ri=%d ", ri));
 337 #ifdef __UCLIBC_MJN3_ONLY__
 338 #warning make sure this is correct
 339 #endif
 340                         if (!ri) {
 341                                 TRACE(("NOT IN THIS LOCALE\n"));
 342                                 goto UNDEFINED;
 343                         }
 344                         ru = CUR_COLLATE->ruletable[ri * CUR_COLLATE->MAX_WEIGHTS + pass];
 345
 346                 RANGE_SKIP_TO:
 347
 348 #ifdef __UCLIBC_MJN3_ONLY__
 349 #warning ignoreables probably should not interrupt backwards processing, but this is wrong
 350 #endif
 351 /*                      if (!(ru & WEIGHT_MASK)) { */
 352 /*                              TRACE(("IGNORE\n")); */
 353 /*                              cs->s += n; */
 354 /*                              continue; */
 355 /*                      } */
 356
 357
 358                         TRACE((" rule = %#x  weight = %#x  popping = %d  s = %p  eob = %p\n",
 359                                    ru & RULE_MASK, ru & WEIGHT_MASK, popping_backup_stack,
 360                                    cs->s, cs->eob));
 361                         /* now we need to check if we're going backwards... */
 362
 363                         if (!popping_backup_stack) {
 364                                 if (!(ru & RULE_MASK)) { /* backward */
 365                                         TRACE(("backwards\n"));
 366                                         assert(cs->bp <= cs->bbe);
 367                                         if (cs->bp == cs->bbe) {
 368                                                 if (cs->back_buf == cs->ibb) { /* was using internal buffer */
 369                                                         cs->bp = malloc(cs->bb_size + 128);
 370                                                         if (!cs->bp) {
 371                                                                 __set_errno(ENOMEM);
 372 #ifdef __UCLIBC_MJN3_ONLY__
 373 #warning what to do here?
 374 #endif
 375                                                                 cs->weight = 0;
 376                                                                 return;
 377                                                         }
 378                                                         memcpy(cs->bp, cs->back_buf, cs->bb_size);
 379
 380                                                 } else {
 381                                                         cs->bp = realloc(cs->back_buf, cs->bb_size + 128);
 382                                                         if (!cs->bp) {
 383                                                                 __set_errno(ENOMEM);
 384 #ifdef __UCLIBC_MJN3_ONLY__
 385 #warning what to do here?
 386 #endif
 387                                                                 cs->weight = 0;
 388                                                                 return;
 389                                                         }
 390                                                 }
 391                                                 cs->bb_size += 128;
 392                                                 cs->bbe = cs->bp + (cs->bbe - cs->back_buf);
 393                                                 cs->back_buf = cs->bp;
 394                                                 cs->bp = cs->bbe;
 395
 396                                         }
 397                                         if (n==1) {                     /* single char */
 398                                                 if (*cs->bp && (((unsigned char)(*cs->bp)) < CHAR_MAX)) {
 399                                                         *cs->bp += 1; /* increment last single's count */
 400                                                 } else {          /* last was a multi, or just starting */
 401                                                         if (!cs->bp) {
 402                                                                 cs->bp = cs->back_buf;
 403                                                         } else {
 404                                                                 assert(cs->bp < cs->bbe);
 405                                                                 ++cs->bp;
 406                                                         }
 407                                                         *cs->bp = 1;
 408                                                 }
 409                                         } else {                        /* multichar */
 410                                                 assert(n>1);
 411                                                 assert(cs->bp < cs->bbe);
 412                                                 *++cs->bp = -n;
 413                                         }
 414                                         cs->s += n;
 415                                         if (*cs->s) {
 416                                                 goto BACK_LOOP;
 417                                         }
 418                                         /* end-of-string so start popping */
 419                                         cs->eob = cs->s;
 420                                         TRACE(("popping\n"));
 421                                         goto POP_BACKUP;
 422                                 } else if (*cs->bp) { /* was going backward but this element isn't */
 423                                         /* discard current and use previous backward element */
 424                                         assert(!cs->cip);
 425                                         cs->eob = cs->s;
 426                                         TRACE(("popping\n"));
 427                                         goto POP_BACKUP;
 428                                 } else {                                /* was and still going forward */
 429                                         TRACE(("forwards\n"));
 430                                         if ((ru & (RULE_POSITION|WEIGHT_MASK)) > RULE_POSITION) {
 431                                                 assert(ru & WEIGHT_MASK);
 432                                                 cs->ru_pushed = ru;
 433                                                 cs->weight = cs->position;
 434 #ifdef __UCLIBC_MJN3_ONLY__
 435 #warning devel code
 436 #endif
 437                                                 cs->position = 0;       /* reset to reduce size for strcoll? */
 438                                                 cs->s += n;
 439                                                 cs->weightidx = RANGE_IDX;
 440                                                 goto PROCESS_WEIGHT;
 441                                         }
 442                                 }
 443                         } else {                                        /* popping backwards stack */
 444                                 TRACE(("popping (continued)\n"));
 445                                 if (!*cs->bp) {
 446                                         cs->s = cs->eob;
 447                                 }
 448                                 cs->s -= n;
 449                         }
 450
 451                         cs->s += n;
 452                 POSITION_SKIP:
 453                         cs->weightidx = ru & WEIGHT_MASK;
 454                         cs->rule = ru & RULE_MASK;
 455                 }
 456
 457 #ifdef __UCLIBC_MJN3_ONLY__
 458 #warning for pending we only want the weight... _not_ the rule
 459 #endif
 460                 if (!cs->weightidx) {   /* ignore */
 461                         continue;
 462                 }
 463
 464         PROCESS_WEIGHT:
 465                 assert(cs->weightidx);
 466
 467
 468                 if (((unsigned int)(cs->weightidx - UI_IDX)) <= (INVAL_IDX-UI_IDX)) {
 469                         if (cs->weightidx == UI_IDX) {
 470                                 cs->weight = cs->ui_weight;
 471                         }
 472                         return;
 473                 }
 474
 475                 assert(cs->weightidx != WEIGHT_MASK);
 476                 if (cs->weightidx == DITTO_IDX) { /* want the weight of the current collating item */
 477                         TRACE(("doing ditto\n"));
 478                         w = CUR_COLLATE->index2weight[cs->colitem -1];
 479                 } else if (cs->weightidx <= CUR_COLLATE->max_col_index) { /* normal */
 480                         TRACE(("doing normal\n"));
 481                         w = CUR_COLLATE->index2weight[cs->weightidx -1];
 482                 } else {                                /* a string */
 483                         TRACE(("doing string\n"));
 484                         assert(!(cs->weightidx & RULE_MASK));
 485                         /* note: iso14561 allows null string here */
 486                         p = CUR_COLLATE->weightstr + (cs->weightidx - (CUR_COLLATE->max_col_index + 2));
 487                         if (*p & WEIGHT_MASK) {
 488                                 r = 0;
 489                                 do {
 490                                         assert(r < MAX_PENDING);
 491                                         cs->ci_pending[r++] = *p++;
 492                                 } while (*p & WEIGHT_MASK);
 493                                 cs->cip = cs->ci_pending;
 494                         }
 495                         continue;
 496                 }
 497
 498                 cs->weight = w;
 499                 return;
 500         } while (1);
 501 }
 502
 503 libc_hidden_proto(__XL_NPP(wcscoll))
 504 int __XL_NPP(wcscoll) (const Wchar *s0, const Wchar *s1   __LOCALE_PARAM )
 505 {
 506         col_state_t ws[2];
 507         int pass;
 508
 509         if (!CUR_COLLATE->num_weights) { /* C locale */
 510 #ifdef WANT_WIDE
 511                 return wcscmp(s0, s1);
 512 #else
 513                 return strcmp(s0, s1);
 514 #endif
 515         }
 516
 517         pass = 0;
 518         do {                                            /* loop through the weights levels */
 519                 init_col_state(ws, s0);
 520                 init_col_state(ws+1, s1);
 521                 do {                                    /* loop through the strings */
 522                         /* for each string, get the next weight */
 523                         next_weight(ws, pass   __LOCALE_ARG );
 524                         next_weight(ws+1, pass   __LOCALE_ARG );
 525                         TRACE(("w0=%lu  w1=%lu\n",
 526                                    (unsigned long) ws[0].weight,
 527                                    (unsigned long) ws[1].weight));
 528
 529                         if (ws[0].weight != ws[1].weight) {
 530                                 return ws[0].weight - ws[1].weight;
 531                         }
 532                 } while (ws[0].weight);
 533         } while (++pass < CUR_COLLATE->num_weights);
 534
 535         return 0;
 536 }
 537 libc_hidden_def(__XL_NPP(wcscoll))
 538
 539 #ifdef WANT_WIDE
 540
 541 extern size_t __wcslcpy(wchar_t *__restrict dst,
 542                 const wchar_t *__restrict src, size_t n);
 543
 544 libc_hidden_proto(__XL_NPP(wcsxfrm))
 545 size_t __XL_NPP(wcsxfrm)(wchar_t *__restrict ws1, const wchar_t *__restrict ws2,
 546                                          size_t n   __LOCALE_PARAM )
 547 {
 548         col_state_t cs;
 549         size_t count;
 550         int pass;
 551
 552         if (!CUR_COLLATE->num_weights) { /* C locale */
 553                 return __wcslcpy(ws1, ws2, n);
 554         }
 555
 556 #ifdef __UCLIBC_MJN3_ONLY__
 557 #warning handle empty string as a special case
 558 #endif
 559
 560         count = pass = 0;
 561         do {                                            /* loop through the weights levels */
 562                 init_col_state(&cs, ws2);
 563                 do {                                    /* loop through the string */
 564                         next_weight(&cs, pass   __LOCALE_ARG );
 565                         TRACE(("weight=%lu (%#lx)\n", (unsigned long) cs.weight, (unsigned long) cs.weight));
 566                         if (count < n) {
 567                                 ws1[count] = cs.weight +1;
 568                         }
 569                         ++count;
 570                         TRACE(("--------------------------------------------\n"));
 571                 } while (cs.weight);
 572                 if (count <= n) {               /* overwrite the trailing 0 end-of-pass marker */
 573                         ws1[count-1] = 1;
 574                 }
 575                 TRACE(("--------------------  pass %d  --------------------\n", pass));
 576         } while (++pass < CUR_COLLATE->num_weights);
 577         if (count <= n) {                       /* oops... change it back */
 578                 ws1[count-1] = 0;
 579         }
 580         return count-1;
 581 }
 582 libc_hidden_def(__XL_NPP(wcsxfrm))
 583
 584 #else  /* WANT_WIDE */
 585
 586 static const unsigned long bound[] = {
 587         1UL << 7,
 588         1UL << 11,
 589         1UL << 16,
 590         1UL << 21,
 591         1UL << 26,
 592 };
 593
 594 static unsigned char first[] = {
 595         0x0, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc
 596 };
 597
 598 /* Use an extension of UTF-8 to store a 32 bit val in max 6 bytes. */
 599
 600 static size_t store(unsigned char *s, size_t count, size_t n, __uwchar_t weight)
 601 {
 602         int i, r;
 603
 604         i = 0;
 605         do {
 606                 if (weight < bound[i]) {
 607                         break;
 608                 }
 609         } while (++i < sizeof(bound)/sizeof(bound[0]));
 610
 611         r = i+1;
 612         if (i + count < n) {
 613                 s += count;
 614                 s[0] = first[i];
 615                 while (i) {
 616                         s[i] = 0x80 | (weight & 0x3f);
 617                         weight >>= 6;
 618                         --i;
 619                 }
 620                 s[0] |= weight;
 621         }
 622
 623         return r;
 624 }
 625
 626 libc_hidden_proto(__XL_NPP(strxfrm))
 627 size_t __XL_NPP(strxfrm)(char *__restrict ws1, const char *__restrict ws2, size_t n
 628                                          __LOCALE_PARAM )
 629 {
 630         col_state_t cs;
 631         size_t count, inc;
 632         int pass;
 633
 634         if (!CUR_COLLATE->num_weights) { /* C locale */
 635                 return strlcpy(ws1, ws2, n);
 636         }
 637
 638 #ifdef __UCLIBC_MJN3_ONLY__
 639 #warning handle empty string as a special case
 640 #endif
 641
 642         inc = count = pass = 0;
 643         do {                                            /* loop through the weights levels */
 644                 init_col_state(&cs, ws2);
 645                 do {                                    /* loop through the string */
 646                         next_weight(&cs, pass   __LOCALE_ARG );
 647                         TRACE(("weight=%lu (%#lx)\n", (unsigned long) cs.weight, (unsigned long) cs.weight));
 648                         inc = store((unsigned char *)ws1, count, n, cs.weight + 1);
 649                         count += inc;
 650                         TRACE(("--------------------------------------------\n"));
 651                 } while (cs.weight);
 652                 /* overwrite the trailing 0 end-of-pass marker */
 653                 assert(inc == 1);
 654                 if (count <= n) {
 655                         ws1[count-1] = 1;
 656                 }
 657                 TRACE(("--------------------  pass %d  --------------------\n", pass));
 658         } while (++pass < CUR_COLLATE->num_weights);
 659         if (count <= n) {                       /* oops... change it back */
 660                 ws1[count-1] = 0;
 661         }
 662         return count-1;
 663 }
 664 libc_hidden_def(__XL_NPP(strxfrm))
 665
 666 #endif /* WANT_WIDE */
 667
 668 #endif /* defined(__UCLIBC_HAS_XLOCALE__) && !defined(__UCLIBC_DO_XLOCALE) */
 669
 670 #endif /* defined(L_strxfrm) || defined(L_strxfrm_l) || defined(L_wcsxfrm) || defined(L_wcsxfrm_l) */
 671
 672 #endif /* __UCLIBC_HAS_LOCALE__ */
 673 /**********************************************************************/