dlls/msvcrt/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_ MSVCRT_wchar_t
  28 #define _EOF_ MSVCRT_WEOF
  29 #define _EOF_RET MSVCRT_WEOF
  30 #define _ISSPACE_(c) MSVCRT_iswspace(c)
  31 #define _ISDIGIT_(c) MSVCRT_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_ MSVCRT_EOF
  39 #define _EOF_RET MSVCRT_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) MSVCRT__lock_file(MSVCRT_stdin)
  52 #define _UNLOCK_FILE_(file) MSVCRT__unlock_file(MSVCRT_stdin)
  53 #ifdef WIDE_SCANF
  54 #ifdef SECURE
  55 #define _FUNCTION_ static int MSVCRT_vcwscanf_s_l(const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  56 #else  /* SECURE */
  57 #define _FUNCTION_ static int MSVCRT_vcwscanf_l(const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  58 #endif /* SECURE */
  59 #else  /* WIDE_SCANF */
  60 #ifdef SECURE
  61 #define _FUNCTION_ static int MSVCRT_vcscanf_s_l(const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  62 #else  /* SECURE */
  63 #define _FUNCTION_ static int MSVCRT_vcscanf_l(const char *format, MSVCRT__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 MSVCRT_vsnwscanf_s_l(const MSVCRT_wchar_t *file, MSVCRT_size_t length, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
  78 #else  /* SECURE */
  79 #define _FUNCTION_ static int MSVCRT_vsnwscanf_l(const MSVCRT_wchar_t *file, MSVCRT_size_t length, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
  80 #endif /* SECURE */
  81 #else /* WIDE_SCANF */
  82 #ifdef SECURE
  83 #define _FUNCTION_ static int MSVCRT_vsnscanf_s_l(const char *file, MSVCRT_size_t length, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  84 #else  /* SECURE */
  85 #define _FUNCTION_ static int MSVCRT_vsnscanf_l(const char *file, MSVCRT_size_t length, const char *format, MSVCRT__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 MSVCRT_vswscanf_s_l(const MSVCRT_wchar_t *file, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
  96 #else  /* SECURE */
  97 #define _FUNCTION_ static int MSVCRT_vswscanf_l(const MSVCRT_wchar_t *file, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
  98 #endif /* SECURE */
  99 #else /* WIDE_SCANF */
 100 #ifdef SECURE
 101 #define _FUNCTION_ static int MSVCRT_vsscanf_s_l(const char *file, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
 102 #else  /* SECURE */
 103 #define _FUNCTION_ static int MSVCRT_vsscanf_l(const char *file, const char *format, MSVCRT__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++, MSVCRT_fgetwc(file))
 110 #define _UNGETC_(nch, file) do { MSVCRT_ungetwc(nch, file); consumed--; } while(0)
 111 #define _LOCK_FILE_(file) MSVCRT__lock_file(file)
 112 #define _UNLOCK_FILE_(file) MSVCRT__unlock_file(file)
 113 #ifdef SECURE
 114 #define _FUNCTION_ static int MSVCRT_vfwscanf_s_l(MSVCRT_FILE* file, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
 115 #else  /* SECURE */
 116 #define _FUNCTION_ static int MSVCRT_vfwscanf_l(MSVCRT_FILE* file, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
 117 #endif /* SECURE */
 118 #else /* WIDE_SCANF */
 119 #define _GETC_(file) (consumed++, MSVCRT_fgetc(file))
 120 #define _UNGETC_(nch, file) do { MSVCRT_ungetc(nch, file); consumed--; } while(0)
 121 #define _LOCK_FILE_(file) MSVCRT__lock_file(file)
 122 #define _UNLOCK_FILE_(file) MSVCRT__unlock_file(file)
 123 #ifdef SECURE
 124 #define _FUNCTION_ static int MSVCRT_vfscanf_s_l(MSVCRT_FILE* file, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
 125 #else  /* SECURE */
 126 #define _FUNCTION_ static int MSVCRT_vfscanf_l(MSVCRT_FILE* file, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
 127 #endif /* SECURE */
 128 #endif /* WIDE_SCANF */
 129 #endif /* STRING */
 130 #endif /* CONSOLE */
 131
 132 _FUNCTION_ {
 133     MSVCRT_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 = 1; break;
 202                 case 'l': l_prefix = 1; break;
 203                 case 'w': w_prefix = 1; break;
 204                 case 'L': L_prefix = 1; break;
 205                 case 'I':
 206                     if (*(format + 1) == '6' &&
 207                         *(format + 2) == '4') {
 208                         I64_prefix = 1;
 209                         format += 2;
 210                     }
 211                     break;
 212                 default:
 213                     prefix_finished = 1;
 214                 }
 215                 if (!prefix_finished) format++;
 216             }
 217             /* read type */
 218             switch(*format) {
 219             case 'p':
 220             case 'P': /* pointer. */
 221                 if (sizeof(void *) == sizeof(LONGLONG)) I64_prefix = 1;
 222                 /* fall through */
 223             case 'x':
 224             case 'X': /* hexadecimal integer. */
 225                 base = 16;
 226                 goto number;
 227             case 'o': /* octal integer */
 228                 base = 8;
 229                 goto number;
 230             case 'u': /* unsigned decimal integer */
 231                 base = 10;
 232                 goto number;
 233             case 'd': /* signed decimal integer */
 234                 base = 10;
 235                 goto number;
 236             case 'i': /* generic integer */
 237                 base = 0;
 238             number: {
 239                     /* read an integer */
 240                     ULONGLONG cur = 0;
 241                     int negative = 0;
 242                     int seendigit=0;
 243                     /* skip initial whitespace */
 244                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 245                         nch = _GETC_(file);
 246                     /* get sign */
 247                     if (nch == '-' || nch == '+') {
 248                         negative = (nch=='-');
 249                         nch = _GETC_(file);
 250                         if (width>0) width--;
 251                     }
 252                     /* look for leading indication of base */
 253                     if (width!=0 && nch == '0' && *format != 'p' && *format != 'P') {
 254                         nch = _GETC_(file);
 255                         if (width>0) width--;
 256                         seendigit=1;
 257                         if (width!=0 && (nch=='x' || nch=='X')) {
 258                             if (base==0)
 259                                 base=16;
 260                             if (base==16) {
 261                                 nch = _GETC_(file);
 262                                 if (width>0) width--;
 263                                 seendigit=0;
 264                             }
 265                         } else if (base==0)
 266                             base = 8;
 267                     }
 268                     /* format %i without indication of base */
 269                     if (base==0)
 270                         base = 10;
 271                     /* throw away leading zeros */
 272                     while (width!=0 && nch=='0') {
 273                         nch = _GETC_(file);
 274                         if (width>0) width--;
 275                         seendigit=1;
 276                     }
 277                     if (width!=0 && _CHAR2DIGIT_(nch, base)!=-1) {
 278                         cur = _CHAR2DIGIT_(nch, base);
 279                         nch = _GETC_(file);
 280                         if (width>0) width--;
 281                         seendigit=1;
 282                     }
 283                     /* read until no more digits */
 284                     while (width!=0 && (nch!=_EOF_) && _CHAR2DIGIT_(nch, base)!=-1) {
 285                         cur = cur*base + _CHAR2DIGIT_(nch, base);
 286                         nch = _GETC_(file);
 287                         if (width>0) width--;
 288                         seendigit=1;
 289                     }
 290                     /* okay, done! */
 291                     if (!seendigit) break; /* not a valid number */
 292                     st = 1;
 293                     if (!suppress) {
 294 #define _SET_NUMBER_(type) *va_arg(ap, type*) = negative ? -cur : cur
 295                         if (I64_prefix) _SET_NUMBER_(LONGLONG);
 296                         else if (l_prefix) _SET_NUMBER_(LONG);
 297                         else if (h_prefix) _SET_NUMBER_(short int);
 298                         else _SET_NUMBER_(int);
 299                     }
 300                 }
 301                 break;
 302             case 'e':
 303             case 'E':
 304             case 'f':
 305             case 'g':
 306             case 'G': { /* read a float */
 307                     long double cur = 0;
 308                     int negative = 0;
 309                     /* skip initial whitespace */
 310                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 311                         nch = _GETC_(file);
 312                     /* get sign. */
 313                     if (nch == '-' || nch == '+') {
 314                         negative = (nch=='-');
 315                         if (width>0) width--;
 316                         if (width==0) break;
 317                         nch = _GETC_(file);
 318                     }
 319                     /* get first digit. */
 320                     if (*locinfo->lconv->decimal_point != nch) {
 321                       if (!_ISDIGIT_(nch)) break;
 322                       cur = (nch - '0');
 323                       nch = _GETC_(file);
 324                       if (width>0) width--;
 325                       /* read until no more digits */
 326                       while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 327                         cur = cur*10 + (nch - '0');
 328                         nch = _GETC_(file);
 329                         if (width>0) width--;
 330                       }
 331                     } else {
 332                       cur = 0; /* Fix: .8 -> 0.8 */
 333                     }
 334                     /* handle decimals */
 335                     if (width!=0 && nch == *locinfo->lconv->decimal_point) {
 336                         long double dec = 1;
 337                         nch = _GETC_(file);
 338                         if (width>0) width--;
 339                         while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 340                             dec /= 10;
 341                             cur += dec * (nch - '0');
 342                             nch = _GETC_(file);
 343                             if (width>0) width--;
 344                         }
 345                     }
 346                     /* handle exponent */
 347                     if (width!=0 && (nch == 'e' || nch == 'E')) {
 348                         int exponent = 0, negexp = 0;
 349                         float expcnt;
 350                         nch = _GETC_(file);
 351                         if (width>0) width--;
 352                         /* possible sign on the exponent */
 353                         if (width!=0 && (nch=='+' || nch=='-')) {
 354                             negexp = (nch=='-');
 355                             nch = _GETC_(file);
 356                             if (width>0) width--;
 357                         }
 358                         /* exponent digits */
 359                         while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 360                             exponent *= 10;
 361                             exponent += (nch - '0');
 362                             nch = _GETC_(file);
 363                             if (width>0) width--;
 364                         }
 365                         /* update 'cur' with this exponent. */
 366                         expcnt =  negexp ? .1 : 10;
 367                         while (exponent!=0) {
 368                             if (exponent&1)
 369                                 cur*=expcnt;
 370                             exponent/=2;
 371                             expcnt=expcnt*expcnt;
 372                         }
 373                     }
 374                     st = 1;
 375                     if (!suppress) {
 376                         if (L_prefix) _SET_NUMBER_(long double);
 377                         else if (l_prefix) _SET_NUMBER_(double);
 378                         else _SET_NUMBER_(float);
 379                     }
 380                 }
 381                 break;
 382                 /* According to msdn,
 383                  * 's' reads a character string in a call to fscanf
 384                  * and 'S' a wide character string and vice versa in a
 385                  * call to fwscanf. The 'h', 'w' and 'l' prefixes override
 386                  * this behaviour. 'h' forces reading char * but 'l' and 'w'
 387                  * force reading WCHAR. */
 388             case 's':
 389                     if (w_prefix || l_prefix) goto widecharstring;
 390                     else if (h_prefix) goto charstring;
 391 #ifdef WIDE_SCANF
 392                     else goto widecharstring;
 393 #else /* WIDE_SCANF */
 394                     else goto charstring;
 395 #endif /* WIDE_SCANF */
 396             case 'S':
 397                     if (w_prefix || l_prefix) goto widecharstring;
 398                     else if (h_prefix) goto charstring;
 399 #ifdef WIDE_SCANF
 400                     else goto charstring;
 401 #else /* WIDE_SCANF */
 402                     else goto widecharstring;
 403 #endif /* WIDE_SCANF */
 404             charstring: { /* read a word into a char */
 405                     char *sptr = suppress ? NULL : va_arg(ap, char*);
 406                     char *sptr_beg = sptr;
 407 #ifdef SECURE
 408                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned);
 409 #else
 410                     unsigned size = UINT_MAX;
 411 #endif
 412                     /* skip initial whitespace */
 413                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 414                         nch = _GETC_(file);
 415                     /* read until whitespace */
 416                     while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
 417                         if (!suppress) {
 418                             *sptr++ = _CHAR2SUPPORTED_(nch);
 419                             if(size>1) size--;
 420                             else {
 421                                 _UNLOCK_FILE_(file);
 422                                 *sptr_beg = 0;
 423                                 return rd;
 424                             }
 425                         }
 426                         st++;
 427                         nch = _GETC_(file);
 428                         if (width>0) width--;
 429                     }
 430                     /* terminate */
 431                     if (!suppress) *sptr = 0;
 432                 }
 433                 break;
 434             widecharstring: { /* read a word into a wchar_t* */
 435                     MSVCRT_wchar_t *sptr = suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
 436                     MSVCRT_wchar_t *sptr_beg = sptr;
 437 #ifdef SECURE
 438                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned);
 439 #else
 440                     unsigned size = UINT_MAX;
 441 #endif
 442                     /* skip initial whitespace */
 443                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 444                         nch = _GETC_(file);
 445                     /* read until whitespace */
 446                     while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
 447                         if (!suppress) {
 448                             *sptr++ = _WIDE2SUPPORTED_(nch);
 449                             if(size>1) size--;
 450                             else {
 451                                 _UNLOCK_FILE_(file);
 452                                 *sptr_beg = 0;
 453                                 return rd;
 454                             }
 455                         }
 456                         st++;
 457                         nch = _GETC_(file);
 458                         if (width>0) width--;
 459                     }
 460                     /* terminate */
 461                     if (!suppress) *sptr = 0;
 462                 }
 463                 break;
 464             /* 'c' and 'C work analogously to 's' and 'S' as described
 465              * above */
 466             case 'c':
 467                     if (w_prefix || l_prefix) goto widecharacter;
 468                     else if (h_prefix) goto character;
 469 #ifdef WIDE_SCANF
 470                     else goto widecharacter;
 471 #else /* WIDE_SCANF */
 472                     else goto character;
 473 #endif /* WIDE_SCANF */
 474             case 'C':
 475                     if (w_prefix || l_prefix) goto widecharacter;
 476                     else if (h_prefix) goto character;
 477 #ifdef WIDE_SCANF
 478                     else goto character;
 479 #else /* WIDE_SCANF */
 480                     else goto widecharacter;
 481 #endif /* WIDE_SCANF */
 482           character: { /* read single character into char */
 483                     char *str = suppress ? NULL : va_arg(ap, char*);
 484                     char *pstr = str;
 485 #ifdef SECURE
 486                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(char);
 487 #else
 488                     unsigned size = UINT_MAX;
 489 #endif
 490                     if (width == -1) width = 1;
 491                     while (width && (nch != _EOF_))
 492                     {
 493                         if (!suppress) {
 494                             *str++ = _CHAR2SUPPORTED_(nch);
 495                             if(size) size--;
 496                             else {
 497                                 _UNLOCK_FILE_(file);
 498                                 *pstr = 0;
 499                                 return rd;
 500                             }
 501                         }
 502                         st++;
 503                         width--;
 504                         nch = _GETC_(file);
 505                     }
 506                 }
 507                 break;
 508           widecharacter: { /* read single character into a wchar_t */
 509                     MSVCRT_wchar_t *str = suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
 510                     MSVCRT_wchar_t *pstr = str;
 511 #ifdef SECURE
 512                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(MSVCRT_wchar_t);
 513 #else
 514                     unsigned size = UINT_MAX;
 515 #endif
 516                     if (width == -1) width = 1;
 517                     while (width && (nch != _EOF_))
 518                     {
 519                         if (!suppress) {
 520                             *str++ = _WIDE2SUPPORTED_(nch);
 521                             if(size) size--;
 522                             else {
 523                                 _UNLOCK_FILE_(file);
 524                                 *pstr = 0;
 525                                 return rd;
 526                             }
 527                         }
 528                         st++;
 529                         width--;
 530                         nch = _GETC_(file);
 531                     }
 532                 }
 533                 break;
 534             case 'n': {
 535                     if (!suppress) {
 536                         int*n = va_arg(ap, int*);
 537                         *n = consumed - 1;
 538                     }
 539                     /* This is an odd one: according to the standard,
 540                      * "Execution of a %n directive does not increment the
 541                      * assignment count returned at the completion of
 542                      * execution" even if it wasn't suppressed with the
 543                      * '*' flag.  The Corrigendum to the standard seems
 544                      * to contradict this (comment out the assignment to
 545                      * suppress below if you want to implement these
 546                      * alternate semantics) but the windows program I'm
 547                      * looking at expects the behavior I've coded here
 548                      * (which happens to be what glibc does as well).
 549                      */
 550                     suppress = 1;
 551                     st = 1;
 552                 }
 553                 break;
 554             case '[': {
 555                     _CHAR_ *str = suppress ? NULL : va_arg(ap, _CHAR_*);
 556                     _CHAR_ *sptr = str;
 557                     RTL_BITMAP bitMask;
 558                     ULONG *Mask;
 559                     int invert = 0; /* Set if we are NOT to find the chars */
 560 #ifdef SECURE
 561                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(_CHAR_);
 562 #else
 563                     unsigned size = UINT_MAX;
 564 #endif
 565
 566                     /* Init our bitmap */
 567                     Mask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, _BITMAPSIZE_/8);
 568                     RtlInitializeBitMap(&bitMask, Mask, _BITMAPSIZE_);
 569
 570                     /* Read the format */
 571                     format++;
 572                     if(*format == '^') {
 573                         invert = 1;
 574                         format++;
 575                     }
 576                     if(*format == ']') {
 577                         RtlSetBits(&bitMask, ']', 1);
 578                         format++;
 579                     }
 580                     while(*format && (*format != ']')) {
 581                         /* According to msdn:
 582                          * "Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]." */
 583                         if((*format == '-') && (*(format + 1) != ']')) {
 584                             if ((*(format - 1)) < *(format + 1))
 585                                 RtlSetBits(&bitMask, *(format - 1) +1 , *(format + 1) - *(format - 1));
 586                             else
 587                                 RtlSetBits(&bitMask, *(format + 1)    , *(format - 1) - *(format + 1));
 588                             format++;
 589                         } else
 590                             RtlSetBits(&bitMask, *format, 1);
 591                         format++;
 592                     }
 593                     /* read until char is not suitable */
 594                     while ((width != 0) && (nch != _EOF_)) {
 595                         if(!invert) {
 596                             if(RtlAreBitsSet(&bitMask, nch, 1)) {
 597                                 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
 598                             } else
 599                                 break;
 600                         } else {
 601                             if(RtlAreBitsClear(&bitMask, nch, 1)) {
 602                                 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
 603                             } else
 604                                 break;
 605                         }
 606                         st++;
 607                         nch = _GETC_(file);
 608                         if (width>0) width--;
 609                         if(size>1) size--;
 610                         else {
 611                             _UNLOCK_FILE_(file);
 612                             *str = 0;
 613                             return rd;
 614                         }
 615                     }
 616                     /* terminate */
 617                     if (!suppress) *sptr = 0;
 618                     HeapFree(GetProcessHeap(), 0, Mask);
 619                 }
 620                 break;
 621             default:
 622                 /* From spec: "if a percent sign is followed by a character
 623                  * that has no meaning as a format-control character, that
 624                  * character and the following characters are treated as
 625                  * an ordinary sequence of characters, that is, a sequence
 626                  * of characters that must match the input.  For example,
 627                  * to specify that a percent-sign character is to be input,
 628                  * use %%." */
 629                 while ((nch!=_EOF_) && _ISSPACE_(nch))
 630                     nch = _GETC_(file);
 631                 if (nch==*format) {
 632                     suppress = 1; /* whoops no field to be read */
 633                     st = 1; /* but we got what we expected */
 634                     nch = _GETC_(file);
 635                 }
 636                 break;
 637             }
 638             if (st && !suppress) rd++;
 639             else if (!st) break;
 640         }
 641         /* a non-white-space character causes scanf to read, but not store,
 642          * a matching non-white-space character. */
 643         else {
 644             /* check for character match */
 645             if (nch == *format) {
 646                 nch = _GETC_(file);
 647             } else break;
 648         }
 649         format++;
 650     }
 651     if (nch!=_EOF_) {
 652         _UNGETC_(nch, file);
 653     }
 654
 655     TRACE("returning %d\n", rd);
 656     _UNLOCK_FILE_(file);
 657     return rd;
 658 }
 659
 660 #undef _CHAR_
 661 #undef _EOF_
 662 #undef _EOF_RET
 663 #undef _ISSPACE_
 664 #undef _ISDIGIT_
 665 #undef _CHAR2SUPPORTED_
 666 #undef _WIDE2SUPPORTED_
 667 #undef _CHAR2DIGIT_
 668 #undef _GETC_
 669 #undef _UNGETC_
 670 #undef _LOCK_FILE_
 671 #undef _UNLOCK_FILE_
 672 #undef _FUNCTION_
 673 #undef _BITMAPSIZE_