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     int rd = 0, consumed = 0;
 134     int nch;
 135     if (!*format) return 0;
 136 #ifndef WIDE_SCANF
 137 #ifdef CONSOLE
 138     TRACE("(%s):\n", debugstr_a(format));
 139 #else /* CONSOLE */
 140 #ifdef STRING
 141     TRACE("%s (%s)\n", debugstr_a(file), debugstr_a(format));
 142 #else /* STRING */
 143     TRACE("%p (%s)\n", file, debugstr_a(format));
 144 #endif /* STRING */
 145 #endif /* CONSOLE */
 146 #endif /* WIDE_SCANF */
 147     _LOCK_FILE_(file);
 148
 149     nch = _GETC_(file);
 150     if (nch == _EOF_) {
 151         _UNLOCK_FILE_(file);
 152         return _EOF_RET;
 153     }
 154
 155     if(!locale)
 156         locale = get_locale();
 157
 158     while (*format) {
 159         /* a whitespace character in the format string causes scanf to read,
 160          * but not store, all consecutive white-space characters in the input
 161          * up to the next non-white-space character.  One white space character
 162          * in the input matches any number (including zero) and combination of
 163          * white-space characters in the input. */
 164         if (_ISSPACE_(*format)) {
 165             /* skip whitespace */
 166             while ((nch!=_EOF_) && _ISSPACE_(nch))
 167                 nch = _GETC_(file);
 168         }
 169         /* a format specification causes scanf to read and convert characters
 170          * in the input into values of a specified type.  The value is assigned
 171          * to an argument in the argument list.  Format specifications have
 172          * the form %[*][width][{h | l | I64 | L}]type */
 173         else if (*format == '%') {
 174             int st = 0; int suppress = 0; int width = 0;
 175             int base;
 176             int h_prefix = 0;
 177             int l_prefix = 0;
 178             int L_prefix = 0;
 179             int w_prefix = 0;
 180             int prefix_finished = 0;
 181             int I64_prefix = 0;
 182             format++;
 183             /* look for leading asterisk, which means 'suppress assignment of
 184              * this field'. */
 185             if (*format=='*') {
 186                 format++;
 187                 suppress=1;
 188             }
 189             /* look for width specification */
 190             while (_ISDIGIT_(*format)) {
 191                 width*=10;
 192                 width+=*format++ - '0';
 193             }
 194             if (width==0) width=-1; /* no width spec seen */
 195             /* read prefix (if any) */
 196             while (!prefix_finished) {
 197                 switch(*format) {
 198                 case 'h': h_prefix = 1; break;
 199                 case 'l': l_prefix = 1; break;
 200                 case 'w': w_prefix = 1; break;
 201                 case 'L': L_prefix = 1; break;
 202                 case 'I':
 203                     if (*(format + 1) == '6' &&
 204                         *(format + 2) == '4') {
 205                         I64_prefix = 1;
 206                         format += 2;
 207                     }
 208                     break;
 209                 default:
 210                     prefix_finished = 1;
 211                 }
 212                 if (!prefix_finished) format++;
 213             }
 214             /* read type */
 215             switch(*format) {
 216             case 'p':
 217             case 'P': /* pointer. */
 218                 if (sizeof(void *) == sizeof(LONGLONG)) I64_prefix = 1;
 219                 /* fall through */
 220             case 'x':
 221             case 'X': /* hexadecimal integer. */
 222                 base = 16;
 223                 goto number;
 224             case 'o': /* octal integer */
 225                 base = 8;
 226                 goto number;
 227             case 'u': /* unsigned decimal integer */
 228                 base = 10;
 229                 goto number;
 230             case 'd': /* signed decimal integer */
 231                 base = 10;
 232                 goto number;
 233             case 'i': /* generic integer */
 234                 base = 0;
 235             number: {
 236                     /* read an integer */
 237                     ULONGLONG cur = 0;
 238                     int negative = 0;
 239                     int seendigit=0;
 240                     /* skip initial whitespace */
 241                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 242                         nch = _GETC_(file);
 243                     /* get sign */
 244                     if (nch == '-' || nch == '+') {
 245                         negative = (nch=='-');
 246                         nch = _GETC_(file);
 247                         if (width>0) width--;
 248                     }
 249                     /* look for leading indication of base */
 250                     if (width!=0 && nch == '0' && *format != 'p' && *format != 'P') {
 251                         nch = _GETC_(file);
 252                         if (width>0) width--;
 253                         seendigit=1;
 254                         if (width!=0 && (nch=='x' || nch=='X')) {
 255                             if (base==0)
 256                                 base=16;
 257                             if (base==16) {
 258                                 nch = _GETC_(file);
 259                                 if (width>0) width--;
 260                                 seendigit=0;
 261                             }
 262                         } else if (base==0)
 263                             base = 8;
 264                     }
 265                     /* format %i without indication of base */
 266                     if (base==0)
 267                         base = 10;
 268                     /* throw away leading zeros */
 269                     while (width!=0 && nch=='0') {
 270                         nch = _GETC_(file);
 271                         if (width>0) width--;
 272                         seendigit=1;
 273                     }
 274                     if (width!=0 && _CHAR2DIGIT_(nch, base)!=-1) {
 275                         cur = _CHAR2DIGIT_(nch, base);
 276                         nch = _GETC_(file);
 277                         if (width>0) width--;
 278                         seendigit=1;
 279                     }
 280                     /* read until no more digits */
 281                     while (width!=0 && (nch!=_EOF_) && _CHAR2DIGIT_(nch, base)!=-1) {
 282                         cur = cur*base + _CHAR2DIGIT_(nch, base);
 283                         nch = _GETC_(file);
 284                         if (width>0) width--;
 285                         seendigit=1;
 286                     }
 287                     /* okay, done! */
 288                     if (!seendigit) break; /* not a valid number */
 289                     st = 1;
 290                     if (!suppress) {
 291 #define _SET_NUMBER_(type) *va_arg(ap, type*) = negative ? -cur : cur
 292                         if (I64_prefix) _SET_NUMBER_(LONGLONG);
 293                         else if (l_prefix) _SET_NUMBER_(LONG);
 294                         else if (h_prefix) _SET_NUMBER_(short int);
 295                         else _SET_NUMBER_(int);
 296                     }
 297                 }
 298                 break;
 299             case 'e':
 300             case 'E':
 301             case 'f':
 302             case 'g':
 303             case 'G': { /* read a float */
 304                     long double cur = 0;
 305                     int negative = 0;
 306                     /* skip initial whitespace */
 307                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 308                         nch = _GETC_(file);
 309                     /* get sign. */
 310                     if (nch == '-' || nch == '+') {
 311                         negative = (nch=='-');
 312                         if (width>0) width--;
 313                         if (width==0) break;
 314                         nch = _GETC_(file);
 315                     }
 316                     /* get first digit. */
 317                     if (*locale->locinfo->lconv->decimal_point != nch) {
 318                       if (!_ISDIGIT_(nch)) break;
 319                       cur = (nch - '0');
 320                       nch = _GETC_(file);
 321                       if (width>0) width--;
 322                       /* read until no more digits */
 323                       while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 324                         cur = cur*10 + (nch - '0');
 325                         nch = _GETC_(file);
 326                         if (width>0) width--;
 327                       }
 328                     } else {
 329                       cur = 0; /* Fix: .8 -> 0.8 */
 330                     }
 331                     /* handle decimals */
 332                     if (width!=0 && nch == *locale->locinfo->lconv->decimal_point) {
 333                         long double dec = 1;
 334                         nch = _GETC_(file);
 335                         if (width>0) width--;
 336                         while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 337                             dec /= 10;
 338                             cur += dec * (nch - '0');
 339                             nch = _GETC_(file);
 340                             if (width>0) width--;
 341                         }
 342                     }
 343                     /* handle exponent */
 344                     if (width!=0 && (nch == 'e' || nch == 'E')) {
 345                         int exponent = 0, negexp = 0;
 346                         float expcnt;
 347                         nch = _GETC_(file);
 348                         if (width>0) width--;
 349                         /* possible sign on the exponent */
 350                         if (width!=0 && (nch=='+' || nch=='-')) {
 351                             negexp = (nch=='-');
 352                             nch = _GETC_(file);
 353                             if (width>0) width--;
 354                         }
 355                         /* exponent digits */
 356                         while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 357                             exponent *= 10;
 358                             exponent += (nch - '0');
 359                             nch = _GETC_(file);
 360                             if (width>0) width--;
 361                         }
 362                         /* update 'cur' with this exponent. */
 363                         expcnt =  negexp ? .1 : 10;
 364                         while (exponent!=0) {
 365                             if (exponent&1)
 366                                 cur*=expcnt;
 367                             exponent/=2;
 368                             expcnt=expcnt*expcnt;
 369                         }
 370                     }
 371                     st = 1;
 372                     if (!suppress) {
 373                         if (L_prefix) _SET_NUMBER_(long double);
 374                         else if (l_prefix) _SET_NUMBER_(double);
 375                         else _SET_NUMBER_(float);
 376                     }
 377                 }
 378                 break;
 379                 /* According to msdn,
 380                  * 's' reads a character string in a call to fscanf
 381                  * and 'S' a wide character string and vice versa in a
 382                  * call to fwscanf. The 'h', 'w' and 'l' prefixes override
 383                  * this behaviour. 'h' forces reading char * but 'l' and 'w'
 384                  * force reading WCHAR. */
 385             case 's':
 386                     if (w_prefix || l_prefix) goto widecharstring;
 387                     else if (h_prefix) goto charstring;
 388 #ifdef WIDE_SCANF
 389                     else goto widecharstring;
 390 #else /* WIDE_SCANF */
 391                     else goto charstring;
 392 #endif /* WIDE_SCANF */
 393             case 'S':
 394                     if (w_prefix || l_prefix) goto widecharstring;
 395                     else if (h_prefix) goto charstring;
 396 #ifdef WIDE_SCANF
 397                     else goto charstring;
 398 #else /* WIDE_SCANF */
 399                     else goto widecharstring;
 400 #endif /* WIDE_SCANF */
 401             charstring: { /* read a word into a char */
 402                     char *sptr = suppress ? NULL : va_arg(ap, char*);
 403                     char *sptr_beg = sptr;
 404 #ifdef SECURE
 405                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned);
 406 #else
 407                     unsigned size = UINT_MAX;
 408 #endif
 409                     /* skip initial whitespace */
 410                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 411                         nch = _GETC_(file);
 412                     /* read until whitespace */
 413                     while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
 414                         if (!suppress) {
 415                             *sptr++ = _CHAR2SUPPORTED_(nch);
 416                             if(size>1) size--;
 417                             else {
 418                                 _UNLOCK_FILE_(file);
 419                                 *sptr_beg = 0;
 420                                 return rd;
 421                             }
 422                         }
 423                         st++;
 424                         nch = _GETC_(file);
 425                         if (width>0) width--;
 426                     }
 427                     /* terminate */
 428                     if (!suppress) *sptr = 0;
 429                 }
 430                 break;
 431             widecharstring: { /* read a word into a wchar_t* */
 432                     MSVCRT_wchar_t *sptr = suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
 433                     MSVCRT_wchar_t *sptr_beg = sptr;
 434 #ifdef SECURE
 435                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned);
 436 #else
 437                     unsigned size = UINT_MAX;
 438 #endif
 439                     /* skip initial whitespace */
 440                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 441                         nch = _GETC_(file);
 442                     /* read until whitespace */
 443                     while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
 444                         if (!suppress) {
 445                             *sptr++ = _WIDE2SUPPORTED_(nch);
 446                             if(size>1) size--;
 447                             else {
 448                                 _UNLOCK_FILE_(file);
 449                                 *sptr_beg = 0;
 450                                 return rd;
 451                             }
 452                         }
 453                         st++;
 454                         nch = _GETC_(file);
 455                         if (width>0) width--;
 456                     }
 457                     /* terminate */
 458                     if (!suppress) *sptr = 0;
 459                 }
 460                 break;
 461             /* 'c' and 'C work analogously to 's' and 'S' as described
 462              * above */
 463             case 'c':
 464                     if (w_prefix || l_prefix) goto widecharacter;
 465                     else if (h_prefix) goto character;
 466 #ifdef WIDE_SCANF
 467                     else goto widecharacter;
 468 #else /* WIDE_SCANF */
 469                     else goto character;
 470 #endif /* WIDE_SCANF */
 471             case 'C':
 472                     if (w_prefix || l_prefix) goto widecharacter;
 473                     else if (h_prefix) goto character;
 474 #ifdef WIDE_SCANF
 475                     else goto character;
 476 #else /* WIDE_SCANF */
 477                     else goto widecharacter;
 478 #endif /* WIDE_SCANF */
 479           character: { /* read single character into char */
 480                     char *str = suppress ? NULL : va_arg(ap, char*);
 481                     char *pstr = str;
 482 #ifdef SECURE
 483                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(char);
 484 #else
 485                     unsigned size = UINT_MAX;
 486 #endif
 487                     if (width == -1) width = 1;
 488                     while (width && (nch != _EOF_))
 489                     {
 490                         if (!suppress) {
 491                             *str++ = _CHAR2SUPPORTED_(nch);
 492                             if(size) size--;
 493                             else {
 494                                 _UNLOCK_FILE_(file);
 495                                 *pstr = 0;
 496                                 return rd;
 497                             }
 498                         }
 499                         st++;
 500                         width--;
 501                         nch = _GETC_(file);
 502                     }
 503                 }
 504                 break;
 505           widecharacter: { /* read single character into a wchar_t */
 506                     MSVCRT_wchar_t *str = suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
 507                     MSVCRT_wchar_t *pstr = str;
 508 #ifdef SECURE
 509                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(MSVCRT_wchar_t);
 510 #else
 511                     unsigned size = UINT_MAX;
 512 #endif
 513                     if (width == -1) width = 1;
 514                     while (width && (nch != _EOF_))
 515                     {
 516                         if (!suppress) {
 517                             *str++ = _WIDE2SUPPORTED_(nch);
 518                             if(size) size--;
 519                             else {
 520                                 _UNLOCK_FILE_(file);
 521                                 *pstr = 0;
 522                                 return rd;
 523                             }
 524                         }
 525                         st++;
 526                         width--;
 527                         nch = _GETC_(file);
 528                     }
 529                 }
 530                 break;
 531             case 'n': {
 532                     if (!suppress) {
 533                         int*n = va_arg(ap, int*);
 534                         *n = consumed - 1;
 535                     }
 536                     /* This is an odd one: according to the standard,
 537                      * "Execution of a %n directive does not increment the
 538                      * assignment count returned at the completion of
 539                      * execution" even if it wasn't suppressed with the
 540                      * '*' flag.  The Corrigendum to the standard seems
 541                      * to contradict this (comment out the assignment to
 542                      * suppress below if you want to implement these
 543                      * alternate semantics) but the windows program I'm
 544                      * looking at expects the behavior I've coded here
 545                      * (which happens to be what glibc does as well).
 546                      */
 547                     suppress = 1;
 548                     st = 1;
 549                 }
 550                 break;
 551             case '[': {
 552                     _CHAR_ *str = suppress ? NULL : va_arg(ap, _CHAR_*);
 553                     _CHAR_ *sptr = str;
 554                     RTL_BITMAP bitMask;
 555                     ULONG *Mask;
 556                     int invert = 0; /* Set if we are NOT to find the chars */
 557 #ifdef SECURE
 558                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(_CHAR_);
 559 #else
 560                     unsigned size = UINT_MAX;
 561 #endif
 562
 563                     /* Init our bitmap */
 564                     Mask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, _BITMAPSIZE_/8);
 565                     RtlInitializeBitMap(&bitMask, Mask, _BITMAPSIZE_);
 566
 567                     /* Read the format */
 568                     format++;
 569                     if(*format == '^') {
 570                         invert = 1;
 571                         format++;
 572                     }
 573                     if(*format == ']') {
 574                         RtlSetBits(&bitMask, ']', 1);
 575                         format++;
 576                     }
 577                     while(*format && (*format != ']')) {
 578                         /* According to msdn:
 579                          * "Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]." */
 580                         if((*format == '-') && (*(format + 1) != ']')) {
 581                             if ((*(format - 1)) < *(format + 1))
 582                                 RtlSetBits(&bitMask, *(format - 1) +1 , *(format + 1) - *(format - 1));
 583                             else
 584                                 RtlSetBits(&bitMask, *(format + 1)    , *(format - 1) - *(format + 1));
 585                             format++;
 586                         } else
 587                             RtlSetBits(&bitMask, *format, 1);
 588                         format++;
 589                     }
 590                     /* read until char is not suitable */
 591                     while ((width != 0) && (nch != _EOF_)) {
 592                         if(!invert) {
 593                             if(RtlAreBitsSet(&bitMask, nch, 1)) {
 594                                 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
 595                             } else
 596                                 break;
 597                         } else {
 598                             if(RtlAreBitsClear(&bitMask, nch, 1)) {
 599                                 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
 600                             } else
 601                                 break;
 602                         }
 603                         st++;
 604                         nch = _GETC_(file);
 605                         if (width>0) width--;
 606                         if(size>1) size--;
 607                         else {
 608                             _UNLOCK_FILE_(file);
 609                             *str = 0;
 610                             return rd;
 611                         }
 612                     }
 613                     /* terminate */
 614                     if (!suppress) *sptr = 0;
 615                     HeapFree(GetProcessHeap(), 0, Mask);
 616                 }
 617                 break;
 618             default:
 619                 /* From spec: "if a percent sign is followed by a character
 620                  * that has no meaning as a format-control character, that
 621                  * character and the following characters are treated as
 622                  * an ordinary sequence of characters, that is, a sequence
 623                  * of characters that must match the input.  For example,
 624                  * to specify that a percent-sign character is to be input,
 625                  * use %%." */
 626                 while ((nch!=_EOF_) && _ISSPACE_(nch))
 627                     nch = _GETC_(file);
 628                 if (nch==*format) {
 629                     suppress = 1; /* whoops no field to be read */
 630                     st = 1; /* but we got what we expected */
 631                     nch = _GETC_(file);
 632                 }
 633                 break;
 634             }
 635             if (st && !suppress) rd++;
 636             else if (!st) break;
 637         }
 638         /* a non-white-space character causes scanf to read, but not store,
 639          * a matching non-white-space character. */
 640         else {
 641             /* check for character match */
 642             if (nch == *format) {
 643                 nch = _GETC_(file);
 644             } else break;
 645         }
 646         format++;
 647     }
 648     if (nch!=_EOF_) {
 649         _UNGETC_(nch, file);
 650     }
 651
 652     TRACE("returning %d\n", rd);
 653     _UNLOCK_FILE_(file);
 654     return rd;
 655 }
 656
 657 #undef _CHAR_
 658 #undef _EOF_
 659 #undef _EOF_RET
 660 #undef _ISSPACE_
 661 #undef _ISDIGIT_
 662 #undef _CHAR2SUPPORTED_
 663 #undef _WIDE2SUPPORTED_
 664 #undef _CHAR2DIGIT_
 665 #undef _GETC_
 666 #undef _UNGETC_
 667 #undef _LOCK_FILE_
 668 #undef _UNLOCK_FILE_
 669 #undef _FUNCTION_
 670 #undef _BITMAPSIZE_