reactos/lib/sdk/crt/string/scanf.h

   1 /*
   2  * general implementation of scanf used by scanf, sscanf, fscanf,
   3  * _cscanf, wscanf, swscanf and fwscanf
   4  *
   5  * Copyright 1996,1998 Marcus Meissner
   6  * Copyright 1996 Jukka Iivonen
   7  * Copyright 1997,2000, 2003 Uwe Bonnes
   8  * Copyright 2000 Jon Griffiths
   9  * Copyright 2002 Daniel Gudbjartsson
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; either
  14  * version 2.1 of the License, or (at your option) any later version.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  24  */
  25
  26 #ifdef WIDE_SCANF
  27 #define _CHAR_ wchar_t
  28 #define _EOF_ WEOF
  29 #define _EOF_RET (short)WEOF
  30 #define _ISSPACE_(c) iswspace(c)
  31 #define _ISDIGIT_(c) iswdigit(c)
  32 #define _WIDE2SUPPORTED_(c) c /* No conversion needed (wide to wide) */
  33 #define _CHAR2SUPPORTED_(c) c /* FIXME: convert char to wide char */
  34 #define _CHAR2DIGIT_(c, base) wchar2digit((c), (base))
  35 #define _BITMAPSIZE_ 256*256
  36 #else /* WIDE_SCANF */
  37 #define _CHAR_ char
  38 #define _EOF_ EOF
  39 #define _EOF_RET EOF
  40 #define _ISSPACE_(c) isspace(c)
  41 #define _ISDIGIT_(c) isdigit(c)
  42 #define _WIDE2SUPPORTED_(c) c /* FIXME: convert wide char to char */
  43 #define _CHAR2SUPPORTED_(c) c /* No conversion needed (char to char) */
  44 #define _CHAR2DIGIT_(c, base) char2digit((c), (base))
  45 #define _BITMAPSIZE_ 256
  46 #endif /* WIDE_SCANF */
  47
  48 #ifdef CONSOLE
  49 #define _GETC_(file) (consumed++, _getch())
  50 #define _UNGETC_(nch, file) do { _ungetch(nch); consumed--; } while(0)
  51 #define _LOCK_FILE_(file) _lock_file(stdin)
  52 #define _UNLOCK_FILE_(file) _unlock_file(stdin)
  53 #ifdef WIDE_SCANF
  54 #ifdef SECURE
  55 #define _FUNCTION_ static int vcwscanf_s_l(const char *format, _locale_t locale, __ms_va_list ap)
  56 #else  /* SECURE */
  57 #define _FUNCTION_ static int vcwscanf_l(const char *format, _locale_t locale, __ms_va_list ap)
  58 #endif /* SECURE */
  59 #else  /* WIDE_SCANF */
  60 #ifdef SECURE
  61 #define _FUNCTION_ static int vcscanf_s_l(const char *format, _locale_t locale, __ms_va_list ap)
  62 #else  /* SECURE */
  63 #define _FUNCTION_ static int vcscanf_l(const char *format, _locale_t locale, __ms_va_list ap)
  64 #endif /* SECURE */
  65 #endif /* WIDE_SCANF */
  66 #else
  67 #ifdef STRING
  68 #undef _EOF_
  69 #define _EOF_ 0
  70 #ifdef STRING_LEN
  71 #define _GETC_(file) (consumed==length ? '\0' : (consumed++, *file++))
  72 #define _UNGETC_(nch, file) do { file--; consumed--; } while(0)
  73 #define _LOCK_FILE_(file) do {} while(0)
  74 #define _UNLOCK_FILE_(file) do {} while(0)
  75 #ifdef WIDE_SCANF
  76 #ifdef SECURE
  77 #define _FUNCTION_ static int vsnwscanf_s_l(const wchar_t *file, size_t length, const wchar_t *format, _locale_t locale, __ms_va_list ap)
  78 #else  /* SECURE */
  79 #define _FUNCTION_ static int vsnwscanf_l(const wchar_t *file, size_t length, const wchar_t *format, _locale_t locale, __ms_va_list ap)
  80 #endif /* SECURE */
  81 #else /* WIDE_SCANF */
  82 #ifdef SECURE
  83 #define _FUNCTION_ static int vsnscanf_s_l(const char *file, size_t length, const char *format, _locale_t locale, __ms_va_list ap)
  84 #else  /* SECURE */
  85 #define _FUNCTION_ static int vsnscanf_l(const char *file, size_t length, const char *format, _locale_t locale, __ms_va_list ap)
  86 #endif /* SECURE */
  87 #endif /* WIDE_SCANF */
  88 #else /* STRING_LEN */
  89 #define _GETC_(file) (consumed++, *file++)
  90 #define _UNGETC_(nch, file) do { file--; consumed--; } while(0)
  91 #define _LOCK_FILE_(file) do {} while(0)
  92 #define _UNLOCK_FILE_(file) do {} while(0)
  93 #ifdef WIDE_SCANF
  94 #ifdef SECURE
  95 #define _FUNCTION_ static int vswscanf_s_l(const wchar_t *file, const wchar_t *format, _locale_t locale, __ms_va_list ap)
  96 #else  /* SECURE */
  97 #define _FUNCTION_ static int vswscanf_l(const wchar_t *file, const wchar_t *format, _locale_t locale, __ms_va_list ap)
  98 #endif /* SECURE */
  99 #else /* WIDE_SCANF */
 100 #ifdef SECURE
 101 #define _FUNCTION_ static int vsscanf_s_l(const char *file, const char *format, _locale_t locale, __ms_va_list ap)
 102 #else  /* SECURE */
 103 #define _FUNCTION_ static int vsscanf_l(const char *file, const char *format, _locale_t locale, __ms_va_list ap)
 104 #endif /* SECURE */
 105 #endif /* WIDE_SCANF */
 106 #endif /* STRING_LEN */
 107 #else /* STRING */
 108 #ifdef WIDE_SCANF
 109 #define _GETC_(file) (consumed++, fgetwc(file))
 110 #define _UNGETC_(nch, file) do { ungetwc(nch, file); consumed--; } while(0)
 111 #define _LOCK_FILE_(file) _lock_file(file)
 112 #define _UNLOCK_FILE_(file) _unlock_file(file)
 113 #ifdef SECURE
 114 #define _FUNCTION_ static int vfwscanf_s_l(FILE* file, const wchar_t *format, _locale_t locale, __ms_va_list ap)
 115 #else  /* SECURE */
 116 #define _FUNCTION_ static int vfwscanf_l(FILE* file, const wchar_t *format, _locale_t locale, __ms_va_list ap)
 117 #endif /* SECURE */
 118 #else /* WIDE_SCANF */
 119 #define _GETC_(file) (consumed++, fgetc(file))
 120 #define _UNGETC_(nch, file) do { ungetc(nch, file); consumed--; } while(0)
 121 #define _LOCK_FILE_(file) _lock_file(file)
 122 #define _UNLOCK_FILE_(file) _unlock_file(file)
 123 #ifdef SECURE
 124 #define _FUNCTION_ static int vfscanf_s_l(FILE* file, const char *format, _locale_t locale, __ms_va_list ap)
 125 #else  /* SECURE */
 126 #define _FUNCTION_ static int vfscanf_l(FILE* file, const char *format, _locale_t locale, __ms_va_list ap)
 127 #endif /* SECURE */
 128 #endif /* WIDE_SCANF */
 129 #endif /* STRING */
 130 #endif /* CONSOLE */
 131
 132 _FUNCTION_ {
 133     pthreadlocinfo locinfo;
 134     int rd = 0, consumed = 0;
 135     int nch;
 136     if (!*format) return 0;
 137 #ifndef WIDE_SCANF
 138 #ifdef CONSOLE
 139     TRACE("(%s):\n", debugstr_a(format));
 140 #else /* CONSOLE */
 141 #ifdef STRING
 142     TRACE("%s (%s)\n", debugstr_a(file), debugstr_a(format));
 143 #else /* STRING */
 144     TRACE("%p (%s)\n", file, debugstr_a(format));
 145 #endif /* STRING */
 146 #endif /* CONSOLE */
 147 #endif /* WIDE_SCANF */
 148     _LOCK_FILE_(file);
 149
 150     nch = _GETC_(file);
 151     if (nch == _EOF_) {
 152         _UNLOCK_FILE_(file);
 153         return _EOF_RET;
 154     }
 155
 156     if(!locale)
 157         locinfo = get_locinfo();
 158     else
 159         locinfo = locale->locinfo;
 160
 161     while (*format) {
 162         /* a whitespace character in the format string causes scanf to read,
 163          * but not store, all consecutive white-space characters in the input
 164          * up to the next non-white-space character.  One white space character
 165          * in the input matches any number (including zero) and combination of
 166          * white-space characters in the input. */
 167         if (_ISSPACE_(*format)) {
 168             /* skip whitespace */
 169             while ((nch!=_EOF_) && _ISSPACE_(nch))
 170                 nch = _GETC_(file);
 171         }
 172         /* a format specification causes scanf to read and convert characters
 173          * in the input into values of a specified type.  The value is assigned
 174          * to an argument in the argument list.  Format specifications have
 175          * the form %[*][width][{h | l | I64 | L}]type */
 176         else if (*format == '%') {
 177             int st = 0; int suppress = 0; int width = 0;
 178             int base;
 179             int h_prefix = 0;
 180             int l_prefix = 0;
 181             int L_prefix = 0;
 182             int w_prefix = 0;
 183             int prefix_finished = 0;
 184             int I64_prefix = 0;
 185             format++;
 186             /* look for leading asterisk, which means 'suppress assignment of
 187              * this field'. */
 188             if (*format=='*') {
 189                 format++;
 190                 suppress=1;
 191             }
 192             /* look for width specification */
 193             while (_ISDIGIT_(*format)) {
 194                 width*=10;
 195                 width+=*format++ - '0';
 196             }
 197             if (width==0) width=-1; /* no width spec seen */
 198             /* read prefix (if any) */
 199             while (!prefix_finished) {
 200                 switch(*format) {
 201                 case 'h': h_prefix++; break;
 202                 case 'l':
 203                     if(*(format+1) == 'l') {
 204                         I64_prefix = 1;
 205                         format++;
 206                     }
 207                     l_prefix = 1;
 208                     break;
 209                 case 'w': w_prefix = 1; break;
 210                 case 'L': L_prefix = 1; break;
 211                 case 'I':
 212                     if (*(format + 1) == '6' &&
 213                         *(format + 2) == '4') {
 214                         I64_prefix = 1;
 215                         format += 2;
 216                     }
 217                     break;
 218                 default:
 219                     prefix_finished = 1;
 220                 }
 221                 if (!prefix_finished) format++;
 222             }
 223             /* read type */
 224             switch(*format) {
 225             case 'p':
 226             case 'P': /* pointer. */
 227                 if (sizeof(void *) == sizeof(LONGLONG)) I64_prefix = 1;
 228                 /* fall through */
 229             case 'x':
 230             case 'X': /* hexadecimal integer. */
 231                 base = 16;
 232                 goto number;
 233             case 'o': /* octal integer */
 234                 base = 8;
 235                 goto number;
 236             case 'u': /* unsigned decimal integer */
 237                 base = 10;
 238                 goto number;
 239             case 'd': /* signed decimal integer */
 240                 base = 10;
 241                 goto number;
 242             case 'i': /* generic integer */
 243                 base = 0;
 244             number: {
 245                     /* read an integer */
 246                     ULONGLONG cur = 0;
 247                     int negative = 0;
 248                     int seendigit=0;
 249                     /* skip initial whitespace */
 250                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 251                         nch = _GETC_(file);
 252                     /* get sign */
 253                     if (nch == '-' || nch == '+') {
 254                         negative = (nch=='-');
 255                         nch = _GETC_(file);
 256                         if (width>0) width--;
 257                     }
 258                     /* look for leading indication of base */
 259                     if (width!=0 && nch == '0' && *format != 'p' && *format != 'P') {
 260                         nch = _GETC_(file);
 261                         if (width>0) width--;
 262                         seendigit=1;
 263                         if (width!=0 && (nch=='x' || nch=='X')) {
 264                             if (base==0)
 265                                 base=16;
 266                             if (base==16) {
 267                                 nch = _GETC_(file);
 268                                 if (width>0) width--;
 269                                 seendigit=0;
 270                             }
 271                         } else if (base==0)
 272                             base = 8;
 273                     }
 274                     /* format %i without indication of base */
 275                     if (base==0)
 276                         base = 10;
 277                     /* throw away leading zeros */
 278                     while (width!=0 && nch=='0') {
 279                         nch = _GETC_(file);
 280                         if (width>0) width--;
 281                         seendigit=1;
 282                     }
 283                     if (width!=0 && _CHAR2DIGIT_(nch, base)!=-1) {
 284                         cur = _CHAR2DIGIT_(nch, base);
 285                         nch = _GETC_(file);
 286                         if (width>0) width--;
 287                         seendigit=1;
 288                     }
 289                     /* read until no more digits */
 290                     while (width!=0 && (nch!=_EOF_) && _CHAR2DIGIT_(nch, base)!=-1) {
 291                         cur = cur*base + _CHAR2DIGIT_(nch, base);
 292                         nch = _GETC_(file);
 293                         if (width>0) width--;
 294                         seendigit=1;
 295                     }
 296                     /* okay, done! */
 297                     if (!seendigit) break; /* not a valid number */
 298                     st = 1;
 299                     if (!suppress) {
 300 #define _SET_NUMBER_(type) *va_arg(ap, type*) = negative ? -cur : cur
 301                         if (I64_prefix) _SET_NUMBER_(LONGLONG);
 302                         else if (l_prefix) _SET_NUMBER_(LONG);
 303                         else if (h_prefix == 1) _SET_NUMBER_(short int);
 304                         else _SET_NUMBER_(int);
 305                     }
 306                 }
 307                 break;
 308             case 'e':
 309             case 'E':
 310             case 'f':
 311             case 'g':
 312             case 'G': { /* read a float */
 313                     //long double cur = 1, expcnt = 10;
 314                     ULONGLONG d, hlp;
 315                     int exp = 0, negative = 0;
 316                     //unsigned fpcontrol;
 317                     //BOOL negexp;
 318
 319                     /* skip initial whitespace */
 320                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 321                         nch = _GETC_(file);
 322
 323                     /* get sign. */
 324                     if (nch == '-' || nch == '+') {
 325                         negative = (nch=='-');
 326                         if (width>0) width--;
 327                         if (width==0) break;
 328                         nch = _GETC_(file);
 329                     }
 330
 331                     /* get first digit. */
 332                     if (*locinfo->lconv->decimal_point != nch) {
 333                         if (!_ISDIGIT_(nch)) break;
 334                         d = nch - '0';
 335                         nch = _GETC_(file);
 336                         if (width>0) width--;
 337                         /* read until no more digits */
 338                         while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 339                             hlp = d*10 + nch - '0';
 340                             nch = _GETC_(file);
 341                             if (width>0) width--;
 342                             if(d > (ULONGLONG)-1/10 || hlp<d) {
 343                                 exp++;
 344                                 break;
 345                             }
 346                             else
 347                                 d = hlp;
 348                         }
 349                         while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 350                             exp++;
 351                             nch = _GETC_(file);
 352                             if (width>0) width--;
 353                         }
 354                     } else {
 355                         d = 0; /* Fix: .8 -> 0.8 */
 356                     }
 357
 358                     /* handle decimals */
 359                     if (width!=0 && nch == *locinfo->lconv->decimal_point) {
 360                         nch = _GETC_(file);
 361                         if (width>0) width--;
 362
 363                         while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 364                             hlp = d*10 + nch - '0';
 365                             nch = _GETC_(file);
 366                             if (width>0) width--;
 367                             if(d > (ULONGLONG)-1/10 || hlp<d)
 368                                 break;
 369
 370                             d = hlp;
 371                             exp--;
 372                         }
 373                         while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 374                             nch = _GETC_(file);
 375                             if (width>0) width--;
 376                         }
 377                     }
 378
 379                     /* handle exponent */
 380                     if (width!=0 && (nch == 'e' || nch == 'E')) {
 381                         int sign = 1, e = 0;
 382
 383                         nch = _GETC_(file);
 384                         if (width>0) width--;
 385                         if (width!=0 && (nch=='+' || nch=='-')) {
 386                             if(nch == '-')
 387                                 sign = -1;
 388                             nch = _GETC_(file);
 389                             if (width>0) width--;
 390                         }
 391
 392                         /* exponent digits */
 393                         while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 394                             if(e > INT_MAX/10 || (e = e*10 + nch - '0')<0)
 395                                 e = INT_MAX;
 396                             nch = _GETC_(file);
 397                             if (width>0) width--;
 398                         }
 399                         e *= sign;
 400
 401                         if(exp<0 && e<0 && e+exp>0) exp = INT_MIN;
 402                         else if(exp>0 && e>0 && e+exp<0) exp = INT_MAX;
 403                         else exp += e;
 404                     }
 405
 406 #ifdef __REACTOS__
 407                     /* ReactOS: don't inline float processing (kernel/freeldr don't like that! */
 408                     _internal_handle_float(negative, exp, suppress, d, l_prefix || L_prefix, &ap);
 409                     st = 1;
 410 #else
 411                     fpcontrol = _control87(0, 0);
 412                     _control87(MSVCRT__EM_DENORMAL|MSVCRT__EM_INVALID|MSVCRT__EM_ZERODIVIDE
 413                             |MSVCRT__EM_OVERFLOW|MSVCRT__EM_UNDERFLOW|MSVCRT__EM_INEXACT, 0xffffffff);
 414
 415                     negexp = (exp < 0);
 416                     if(negexp)
 417                         exp = -exp;
 418                     /* update 'cur' with this exponent. */
 419                     while(exp) {
 420                         if(exp & 1)
 421                             cur *= expcnt;
 422                         exp /= 2;
 423                         expcnt = expcnt*expcnt;
 424                     }
 425                     cur = (negexp ? d/cur : d*cur);
 426
 427                     _control87(fpcontrol, 0xffffffff);
 428
 429                     st = 1;
 430                     if (!suppress) {
 431                         if (L_prefix) _SET_NUMBER_(double);
 432                         else if (l_prefix) _SET_NUMBER_(double);
 433                         else _SET_NUMBER_(float);
 434                     }
 435 #endif /* __REACTOS__ */
 436                 }
 437                 break;
 438                 /* According to msdn,
 439                  * 's' reads a character string in a call to fscanf
 440                  * and 'S' a wide character string and vice versa in a
 441                  * call to fwscanf. The 'h', 'w' and 'l' prefixes override
 442                  * this behaviour. 'h' forces reading char * but 'l' and 'w'
 443                  * force reading WCHAR. */
 444             case 's':
 445                     if (w_prefix || l_prefix) goto widecharstring;
 446                     else if (h_prefix) goto charstring;
 447 #ifdef WIDE_SCANF
 448                     else goto widecharstring;
 449 #else /* WIDE_SCANF */
 450                     else goto charstring;
 451 #endif /* WIDE_SCANF */
 452             case 'S':
 453                     if (w_prefix || l_prefix) goto widecharstring;
 454                     else if (h_prefix) goto charstring;
 455 #ifdef WIDE_SCANF
 456                     else goto charstring;
 457 #else /* WIDE_SCANF */
 458                     else goto widecharstring;
 459 #endif /* WIDE_SCANF */
 460             charstring: { /* read a word into a char */
 461                     char *sptr = suppress ? NULL : va_arg(ap, char*);
 462                     char *sptr_beg = sptr;
 463 #ifdef SECURE
 464                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned);
 465 #else
 466                     unsigned size = UINT_MAX;
 467 #endif
 468                     /* skip initial whitespace */
 469                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 470                         nch = _GETC_(file);
 471                     /* read until whitespace */
 472                     while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
 473                         if (!suppress) {
 474                             *sptr++ = _CHAR2SUPPORTED_(nch);
 475                             if(size>1) size--;
 476                             else {
 477                                 _UNLOCK_FILE_(file);
 478                                 *sptr_beg = 0;
 479                                 return rd;
 480                             }
 481                         }
 482                         st++;
 483                         nch = _GETC_(file);
 484                         if (width>0) width--;
 485                     }
 486                     /* terminate */
 487                     if (st && !suppress) *sptr = 0;
 488                 }
 489                 break;
 490             widecharstring: { /* read a word into a wchar_t* */
 491                     wchar_t *sptr = suppress ? NULL : va_arg(ap, wchar_t*);
 492                     wchar_t *sptr_beg = sptr;
 493 #ifdef SECURE
 494                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned);
 495 #else
 496                     unsigned size = UINT_MAX;
 497 #endif
 498                     /* skip initial whitespace */
 499                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 500                         nch = _GETC_(file);
 501                     /* read until whitespace */
 502                     while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
 503                         if (!suppress) {
 504                             *sptr++ = _WIDE2SUPPORTED_(nch);
 505                             if(size>1) size--;
 506                             else {
 507                                 _UNLOCK_FILE_(file);
 508                                 *sptr_beg = 0;
 509                                 return rd;
 510                             }
 511                         }
 512                         st++;
 513                         nch = _GETC_(file);
 514                         if (width>0) width--;
 515                     }
 516                     /* terminate */
 517                     if (st && !suppress) *sptr = 0;
 518                 }
 519                 break;
 520             /* 'c' and 'C work analogously to 's' and 'S' as described
 521              * above */
 522             case 'c':
 523                     if (w_prefix || l_prefix) goto widecharacter;
 524                     else if (h_prefix) goto character;
 525 #ifdef WIDE_SCANF
 526                     else goto widecharacter;
 527 #else /* WIDE_SCANF */
 528                     else goto character;
 529 #endif /* WIDE_SCANF */
 530             case 'C':
 531                     if (w_prefix || l_prefix) goto widecharacter;
 532                     else if (h_prefix) goto character;
 533 #ifdef WIDE_SCANF
 534                     else goto character;
 535 #else /* WIDE_SCANF */
 536                     else goto widecharacter;
 537 #endif /* WIDE_SCANF */
 538           character: { /* read single character into char */
 539                     char *str = suppress ? NULL : va_arg(ap, char*);
 540                     char *pstr = str;
 541 #ifdef SECURE
 542                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(char);
 543 #else
 544                     unsigned size = UINT_MAX;
 545 #endif
 546                     if (width == -1) width = 1;
 547                     while (width && (nch != _EOF_))
 548                     {
 549                         if (!suppress) {
 550                             *str++ = _CHAR2SUPPORTED_(nch);
 551                             if(size) size--;
 552                             else {
 553                                 _UNLOCK_FILE_(file);
 554                                 *pstr = 0;
 555                                 return rd;
 556                             }
 557                         }
 558                         st++;
 559                         width--;
 560                         nch = _GETC_(file);
 561                     }
 562                 }
 563                 break;
 564           widecharacter: { /* read single character into a wchar_t */
 565                     wchar_t *str = suppress ? NULL : va_arg(ap, wchar_t*);
 566                     wchar_t *pstr = str;
 567 #ifdef SECURE
 568                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(wchar_t);
 569 #else
 570                     unsigned size = UINT_MAX;
 571 #endif
 572                     if (width == -1) width = 1;
 573                     while (width && (nch != _EOF_))
 574                     {
 575                         if (!suppress) {
 576                             *str++ = _WIDE2SUPPORTED_(nch);
 577                             if(size) size--;
 578                             else {
 579                                 _UNLOCK_FILE_(file);
 580                                 *pstr = 0;
 581                                 return rd;
 582                             }
 583                         }
 584                         st++;
 585                         width--;
 586                         nch = _GETC_(file);
 587                     }
 588                 }
 589                 break;
 590             case 'n': {
 591                     if (!suppress) {
 592                         int*n = va_arg(ap, int*);
 593                         *n = consumed - 1;
 594                     }
 595                     /* This is an odd one: according to the standard,
 596                      * "Execution of a %n directive does not increment the
 597                      * assignment count returned at the completion of
 598                      * execution" even if it wasn't suppressed with the
 599                      * '*' flag.  The Corrigendum to the standard seems
 600                      * to contradict this (comment out the assignment to
 601                      * suppress below if you want to implement these
 602                      * alternate semantics) but the windows program I'm
 603                      * looking at expects the behavior I've coded here
 604                      * (which happens to be what glibc does as well).
 605                      */
 606                     suppress = 1;
 607                     st = 1;
 608                 }
 609                 break;
 610             case '[': {
 611                     _CHAR_ *str = suppress ? NULL : va_arg(ap, _CHAR_*);
 612                     _CHAR_ *sptr = str;
 613                     RTL_BITMAP bitMask;
 614                     ULONG *Mask;
 615                     int invert = 0; /* Set if we are NOT to find the chars */
 616 #ifdef SECURE
 617                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(_CHAR_);
 618 #else
 619                     unsigned size = UINT_MAX;
 620 #endif
 621
 622                     /* Init our bitmap */
 623                     Mask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, _BITMAPSIZE_/8);
 624                     RtlInitializeBitMap(&bitMask, Mask, _BITMAPSIZE_);
 625
 626                     /* Read the format */
 627                     format++;
 628                     if(*format == '^') {
 629                         invert = 1;
 630                         format++;
 631                     }
 632                     if(*format == ']') {
 633                         RtlSetBits(&bitMask, ']', 1);
 634                         format++;
 635                     }
 636                     while(*format && (*format != ']')) {
 637                         /* According to msdn:
 638                          * "Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]." */
 639                         if((*format == '-') && (*(format + 1) != ']')) {
 640                             if ((*(format - 1)) < *(format + 1))
 641                                 RtlSetBits(&bitMask, *(format - 1) +1 , *(format + 1) - *(format - 1));
 642                             else
 643                                 RtlSetBits(&bitMask, *(format + 1)    , *(format - 1) - *(format + 1));
 644                             format++;
 645                         } else
 646                             RtlSetBits(&bitMask, *format, 1);
 647                         format++;
 648                     }
 649                     /* read until char is not suitable */
 650                     while ((width != 0) && (nch != _EOF_)) {
 651                         if(!invert) {
 652                             if(RtlAreBitsSet(&bitMask, nch, 1)) {
 653                                 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
 654                             } else
 655                                 break;
 656                         } else {
 657                             if(RtlAreBitsClear(&bitMask, nch, 1)) {
 658                                 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
 659                             } else
 660                                 break;
 661                         }
 662                         st++;
 663                         nch = _GETC_(file);
 664                         if (width>0) width--;
 665                         if(size>1) size--;
 666                         else {
 667                             _UNLOCK_FILE_(file);
 668                             *str = 0;
 669                             return rd;
 670                         }
 671                     }
 672                     /* terminate */
 673                     if (!suppress) *sptr = 0;
 674                     HeapFree(GetProcessHeap(), 0, Mask);
 675                 }
 676                 break;
 677             default:
 678                 /* From spec: "if a percent sign is followed by a character
 679                  * that has no meaning as a format-control character, that
 680                  * character and the following characters are treated as
 681                  * an ordinary sequence of characters, that is, a sequence
 682                  * of characters that must match the input.  For example,
 683                  * to specify that a percent-sign character is to be input,
 684                  * use %%." */
 685                 while ((nch!=_EOF_) && _ISSPACE_(nch))
 686                     nch = _GETC_(file);
 687                 if (nch==*format) {
 688                     suppress = 1; /* whoops no field to be read */
 689                     st = 1; /* but we got what we expected */
 690                     nch = _GETC_(file);
 691                 }
 692                 break;
 693             }
 694             if (st && !suppress) rd++;
 695             else if (!st) break;
 696         }
 697         /* a non-white-space character causes scanf to read, but not store,
 698          * a matching non-white-space character. */
 699         else {
 700             /* check for character match */
 701             if (nch == *format) {
 702                 nch = _GETC_(file);
 703             } else break;
 704         }
 705         format++;
 706     }
 707     if (nch!=_EOF_) {
 708         _UNGETC_(nch, file);
 709     }
 710
 711     TRACE("returning %d\n", rd);
 712     _UNLOCK_FILE_(file);
 713     return rd;
 714 }
 715
 716 #undef _CHAR_
 717 #undef _EOF_
 718 #undef _EOF_RET
 719 #undef _ISSPACE_
 720 #undef _ISDIGIT_
 721 #undef _CHAR2SUPPORTED_
 722 #undef _WIDE2SUPPORTED_
 723 #undef _CHAR2DIGIT_
 724 #undef _GETC_
 725 #undef _UNGETC_
 726 #undef _LOCK_FILE_
 727 #undef _UNLOCK_FILE_
 728 #undef _FUNCTION_
 729 #undef _BITMAPSIZE_