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 #ifdef WIDE_SCANF
  52 #ifdef SECURE
  53 #define _FUNCTION_ static int MSVCRT_vcwscanf_s_l(const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  54 #else  /* SECURE */
  55 #define _FUNCTION_ static int MSVCRT_vcwscanf_l(const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  56 #endif /* SECURE */
  57 #else  /* WIDE_SCANF */
  58 #ifdef SECURE
  59 #define _FUNCTION_ static int MSVCRT_vcscanf_s_l(const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  60 #else  /* SECURE */
  61 #define _FUNCTION_ static int MSVCRT_vcscanf_l(const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  62 #endif /* SECURE */
  63 #endif /* WIDE_SCANF */
  64 #else
  65 #ifdef STRING
  66 #undef _EOF_
  67 #define _EOF_ 0
  68 #define _GETC_(file) (consumed++, *file++)
  69 #define _UNGETC_(nch, file) do { file--; consumed--; } while(0)
  70 #ifdef WIDE_SCANF
  71 #ifdef SECURE
  72 #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)
  73 #else  /* SECURE */
  74 #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)
  75 #endif /* SECURE */
  76 #else /* WIDE_SCANF */
  77 #ifdef SECURE
  78 #define _FUNCTION_ static int MSVCRT_vsscanf_s_l(const char *file, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  79 #else  /* SECURE */
  80 #define _FUNCTION_ static int MSVCRT_vsscanf_l(const char *file, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  81 #endif /* SECURE */
  82 #endif /* WIDE_SCANF */
  83 #else /* STRING */
  84 #ifdef WIDE_SCANF
  85 #define _GETC_(file) (consumed++, MSVCRT_fgetwc(file))
  86 #define _UNGETC_(nch, file) do { MSVCRT_ungetwc(nch, file); consumed--; } while(0)
  87 #ifdef SECURE
  88 #define _FUNCTION_ static int MSVCRT_vfwscanf_s_l(MSVCRT_FILE* file, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
  89 #else  /* SECURE */
  90 #define _FUNCTION_ static int MSVCRT_vfwscanf_l(MSVCRT_FILE* file, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
  91 #endif /* SECURE */
  92 #else /* WIDE_SCANF */
  93 #define _GETC_(file) (consumed++, MSVCRT_fgetc(file))
  94 #define _UNGETC_(nch, file) do { MSVCRT_ungetc(nch, file); consumed--; } while(0)
  95 #ifdef SECURE
  96 #define _FUNCTION_ static int MSVCRT_vfscanf_s_l(MSVCRT_FILE* file, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  97 #else  /* SECURE */
  98 #define _FUNCTION_ static int MSVCRT_vfscanf_l(MSVCRT_FILE* file, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
  99 #endif /* SECURE */
 100 #endif /* WIDE_SCANF */
 101 #endif /* STRING */
 102 #endif /* CONSOLE */
 103
 104 _FUNCTION_ {
 105     int rd = 0, consumed = 0;
 106     int nch;
 107     if (!*format) return 0;
 108 #ifndef WIDE_SCANF
 109 #ifdef CONSOLE
 110     TRACE("(%s):\n", debugstr_a(format));
 111 #else /* CONSOLE */
 112 #ifdef STRING
 113     TRACE("%s (%s)\n", debugstr_a(file), debugstr_a(format));
 114 #else /* STRING */
 115     TRACE("%p (%s)\n", file, debugstr_a(format));
 116 #endif /* STRING */
 117 #endif /* CONSOLE */
 118 #endif /* WIDE_SCANF */
 119     nch = _GETC_(file);
 120     if (nch == _EOF_) return _EOF_RET;
 121
 122     if(!locale)
 123         locale = get_locale();
 124
 125     while (*format) {
 126         /* a whitespace character in the format string causes scanf to read,
 127          * but not store, all consecutive white-space characters in the input
 128          * up to the next non-white-space character.  One white space character
 129          * in the input matches any number (including zero) and combination of
 130          * white-space characters in the input. */
 131         if (_ISSPACE_(*format)) {
 132             /* skip whitespace */
 133             while ((nch!=_EOF_) && _ISSPACE_(nch))
 134                 nch = _GETC_(file);
 135         }
 136         /* a format specification causes scanf to read and convert characters
 137          * in the input into values of a specified type.  The value is assigned
 138          * to an argument in the argument list.  Format specifications have
 139          * the form %[*][width][{h | l | I64 | L}]type */
 140         else if (*format == '%') {
 141             int st = 0; int suppress = 0; int width = 0;
 142             int base;
 143             int h_prefix = 0;
 144             int l_prefix = 0;
 145             int L_prefix = 0;
 146             int w_prefix = 0;
 147             int prefix_finished = 0;
 148             int I64_prefix = 0;
 149             format++;
 150             /* look for leading asterisk, which means 'suppress assignment of
 151              * this field'. */
 152             if (*format=='*') {
 153                 format++;
 154                 suppress=1;
 155             }
 156             /* look for width specification */
 157             while (_ISDIGIT_(*format)) {
 158                 width*=10;
 159                 width+=*format++ - '0';
 160             }
 161             if (width==0) width=-1; /* no width spec seen */
 162             /* read prefix (if any) */
 163             while (!prefix_finished) {
 164                 switch(*format) {
 165                 case 'h': h_prefix = 1; break;
 166                 case 'l': l_prefix = 1; break;
 167                 case 'w': w_prefix = 1; break;
 168                 case 'L': L_prefix = 1; break;
 169                 case 'I':
 170                     if (*(format + 1) == '6' &&
 171                         *(format + 2) == '4') {
 172                         I64_prefix = 1;
 173                         format += 2;
 174                     }
 175                     break;
 176                 default:
 177                     prefix_finished = 1;
 178                 }
 179                 if (!prefix_finished) format++;
 180             }
 181             /* read type */
 182             switch(*format) {
 183             case 'p':
 184             case 'P': /* pointer. */
 185                 if (sizeof(void *) == sizeof(LONGLONG)) I64_prefix = 1;
 186                 /* fall through */
 187             case 'x':
 188             case 'X': /* hexadecimal integer. */
 189                 base = 16;
 190                 goto number;
 191             case 'o': /* octal integer */
 192                 base = 8;
 193                 goto number;
 194             case 'u': /* unsigned decimal integer */
 195                 base = 10;
 196                 goto number;
 197             case 'd': /* signed decimal integer */
 198                 base = 10;
 199                 goto number;
 200             case 'i': /* generic integer */
 201                 base = 0;
 202             number: {
 203                     /* read an integer */
 204                     ULONGLONG cur = 0;
 205                     int negative = 0;
 206                     int seendigit=0;
 207                     /* skip initial whitespace */
 208                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 209                         nch = _GETC_(file);
 210                     /* get sign */
 211                     if (nch == '-' || nch == '+') {
 212                         negative = (nch=='-');
 213                         nch = _GETC_(file);
 214                         if (width>0) width--;
 215                     }
 216                     /* look for leading indication of base */
 217                     if (width!=0 && nch == '0' && *format != 'p' && *format != 'P') {
 218                         nch = _GETC_(file);
 219                         if (width>0) width--;
 220                         seendigit=1;
 221                         if (width!=0 && (nch=='x' || nch=='X')) {
 222                             if (base==0)
 223                                 base=16;
 224                             if (base==16) {
 225                                 nch = _GETC_(file);
 226                                 if (width>0) width--;
 227                                 seendigit=0;
 228                             }
 229                         } else if (base==0)
 230                             base = 8;
 231                     }
 232                     /* format %i without indication of base */
 233                     if (base==0)
 234                         base = 10;
 235                     /* throw away leading zeros */
 236                     while (width!=0 && nch=='0') {
 237                         nch = _GETC_(file);
 238                         if (width>0) width--;
 239                         seendigit=1;
 240                     }
 241                     if (width!=0 && _CHAR2DIGIT_(nch, base)!=-1) {
 242                         cur = _CHAR2DIGIT_(nch, base);
 243                         nch = _GETC_(file);
 244                         if (width>0) width--;
 245                         seendigit=1;
 246                     }
 247                     /* read until no more digits */
 248                     while (width!=0 && (nch!=_EOF_) && _CHAR2DIGIT_(nch, base)!=-1) {
 249                         cur = cur*base + _CHAR2DIGIT_(nch, base);
 250                         nch = _GETC_(file);
 251                         if (width>0) width--;
 252                         seendigit=1;
 253                     }
 254                     /* okay, done! */
 255                     if (!seendigit) break; /* not a valid number */
 256                     st = 1;
 257                     if (!suppress) {
 258 #define _SET_NUMBER_(type) *va_arg(ap, type*) = negative ? -cur : cur
 259                         if (I64_prefix) _SET_NUMBER_(LONGLONG);
 260                         else if (l_prefix) _SET_NUMBER_(LONG);
 261                         else if (h_prefix) _SET_NUMBER_(short int);
 262                         else _SET_NUMBER_(int);
 263                     }
 264                 }
 265                 break;
 266             case 'e':
 267             case 'E':
 268             case 'f':
 269             case 'g':
 270             case 'G': { /* read a float */
 271                     long double cur = 0;
 272                     int negative = 0;
 273                     /* skip initial whitespace */
 274                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 275                         nch = _GETC_(file);
 276                     /* get sign. */
 277                     if (nch == '-' || nch == '+') {
 278                         negative = (nch=='-');
 279                         if (width>0) width--;
 280                         if (width==0) break;
 281                         nch = _GETC_(file);
 282                     }
 283                     /* get first digit. */
 284                     if (*locale->locinfo->lconv->decimal_point != nch) {
 285                       if (!_ISDIGIT_(nch)) break;
 286                       cur = (nch - '0');
 287                       nch = _GETC_(file);
 288                       if (width>0) width--;
 289                       /* read until no more digits */
 290                       while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 291                         cur = cur*10 + (nch - '0');
 292                         nch = _GETC_(file);
 293                         if (width>0) width--;
 294                       }
 295                     } else {
 296                       cur = 0; /* Fix: .8 -> 0.8 */
 297                     }
 298                     /* handle decimals */
 299                     if (width!=0 && nch == *locale->locinfo->lconv->decimal_point) {
 300                         long double dec = 1;
 301                         nch = _GETC_(file);
 302                         if (width>0) width--;
 303                         while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 304                             dec /= 10;
 305                             cur += dec * (nch - '0');
 306                             nch = _GETC_(file);
 307                             if (width>0) width--;
 308                         }
 309                     }
 310                     /* handle exponent */
 311                     if (width!=0 && (nch == 'e' || nch == 'E')) {
 312                         int exponent = 0, negexp = 0;
 313                         float expcnt;
 314                         nch = _GETC_(file);
 315                         if (width>0) width--;
 316                         /* possible sign on the exponent */
 317                         if (width!=0 && (nch=='+' || nch=='-')) {
 318                             negexp = (nch=='-');
 319                             nch = _GETC_(file);
 320                             if (width>0) width--;
 321                         }
 322                         /* exponent digits */
 323                         while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
 324                             exponent *= 10;
 325                             exponent += (nch - '0');
 326                             nch = _GETC_(file);
 327                             if (width>0) width--;
 328                         }
 329                         /* update 'cur' with this exponent. */
 330                         expcnt =  negexp ? .1 : 10;
 331                         while (exponent!=0) {
 332                             if (exponent&1)
 333                                 cur*=expcnt;
 334                             exponent/=2;
 335                             expcnt=expcnt*expcnt;
 336                         }
 337                     }
 338                     st = 1;
 339                     if (!suppress) {
 340                         if (L_prefix) _SET_NUMBER_(long double);
 341                         else if (l_prefix) _SET_NUMBER_(double);
 342                         else _SET_NUMBER_(float);
 343                     }
 344                 }
 345                 break;
 346                 /* According to msdn,
 347                  * 's' reads a character string in a call to fscanf
 348                  * and 'S' a wide character string and vice versa in a
 349                  * call to fwscanf. The 'h', 'w' and 'l' prefixes override
 350                  * this behaviour. 'h' forces reading char * but 'l' and 'w'
 351                  * force reading WCHAR. */
 352             case 's':
 353                     if (w_prefix || l_prefix) goto widecharstring;
 354                     else if (h_prefix) goto charstring;
 355 #ifdef WIDE_SCANF
 356                     else goto widecharstring;
 357 #else /* WIDE_SCANF */
 358                     else goto charstring;
 359 #endif /* WIDE_SCANF */
 360             case 'S':
 361                     if (w_prefix || l_prefix) goto widecharstring;
 362                     else if (h_prefix) goto charstring;
 363 #ifdef WIDE_SCANF
 364                     else goto charstring;
 365 #else /* WIDE_SCANF */
 366                     else goto widecharstring;
 367 #endif /* WIDE_SCANF */
 368             charstring: { /* read a word into a char */
 369                     char *sptr = suppress ? NULL : va_arg(ap, char*);
 370                     char *sptr_beg = sptr;
 371 #ifdef SECURE
 372                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned);
 373 #else
 374                     unsigned size = UINT_MAX;
 375 #endif
 376                     /* skip initial whitespace */
 377                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 378                         nch = _GETC_(file);
 379                     /* read until whitespace */
 380                     while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
 381                         if (!suppress) {
 382                             *sptr++ = _CHAR2SUPPORTED_(nch);
 383                             if(size>1) size--;
 384                             else {
 385                                 *sptr_beg = 0;
 386                                 return rd;
 387                             }
 388                         }
 389                         st++;
 390                         nch = _GETC_(file);
 391                         if (width>0) width--;
 392                     }
 393                     /* terminate */
 394                     if (!suppress) *sptr = 0;
 395                 }
 396                 break;
 397             widecharstring: { /* read a word into a wchar_t* */
 398                     MSVCRT_wchar_t *sptr = suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
 399                     MSVCRT_wchar_t *sptr_beg = sptr;
 400 #ifdef SECURE
 401                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned);
 402 #else
 403                     unsigned size = UINT_MAX;
 404 #endif
 405                     /* skip initial whitespace */
 406                     while ((nch!=_EOF_) && _ISSPACE_(nch))
 407                         nch = _GETC_(file);
 408                     /* read until whitespace */
 409                     while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
 410                         if (!suppress) {
 411                             *sptr++ = _WIDE2SUPPORTED_(nch);
 412                             if(size>1) size--;
 413                             else {
 414                                 *sptr_beg = 0;
 415                                 return rd;
 416                             }
 417                         }
 418                         st++;
 419                         nch = _GETC_(file);
 420                         if (width>0) width--;
 421                     }
 422                     /* terminate */
 423                     if (!suppress) *sptr = 0;
 424                 }
 425                 break;
 426             /* 'c' and 'C work analogously to 's' and 'S' as described
 427              * above */
 428             case 'c':
 429                     if (w_prefix || l_prefix) goto widecharacter;
 430                     else if (h_prefix) goto character;
 431 #ifdef WIDE_SCANF
 432                     else goto widecharacter;
 433 #else /* WIDE_SCANF */
 434                     else goto character;
 435 #endif /* WIDE_SCANF */
 436             case 'C':
 437                     if (w_prefix || l_prefix) goto widecharacter;
 438                     else if (h_prefix) goto character;
 439 #ifdef WIDE_SCANF
 440                     else goto character;
 441 #else /* WIDE_SCANF */
 442                     else goto widecharacter;
 443 #endif /* WIDE_SCANF */
 444           character: { /* read single character into char */
 445                     char *str = suppress ? NULL : va_arg(ap, char*);
 446                     char *pstr = str;
 447 #ifdef SECURE
 448                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(char);
 449 #else
 450                     unsigned size = UINT_MAX;
 451 #endif
 452                     if (width == -1) width = 1;
 453                     while (width && (nch != _EOF_))
 454                     {
 455                         if (!suppress) {
 456                             *str++ = _CHAR2SUPPORTED_(nch);
 457                             if(size) size--;
 458                             else {
 459                                 *pstr = 0;
 460                                 return rd;
 461                             }
 462                         }
 463                         st++;
 464                         width--;
 465                         nch = _GETC_(file);
 466                     }
 467                 }
 468                 break;
 469           widecharacter: { /* read single character into a wchar_t */
 470                     MSVCRT_wchar_t *str = suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
 471                     MSVCRT_wchar_t *pstr = str;
 472 #ifdef SECURE
 473                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(MSVCRT_wchar_t);
 474 #else
 475                     unsigned size = UINT_MAX;
 476 #endif
 477                     if (width == -1) width = 1;
 478                     while (width && (nch != _EOF_))
 479                     {
 480                         if (!suppress) {
 481                             *str++ = _WIDE2SUPPORTED_(nch);
 482                             if(size) size--;
 483                             else {
 484                                 *pstr = 0;
 485                                 return rd;
 486                             }
 487                         }
 488                         st++;
 489                         width--;
 490                         nch = _GETC_(file);
 491                     }
 492                 }
 493                 break;
 494             case 'n': {
 495                     if (!suppress) {
 496                         int*n = va_arg(ap, int*);
 497                         *n = consumed - 1;
 498                     }
 499                     /* This is an odd one: according to the standard,
 500                      * "Execution of a %n directive does not increment the
 501                      * assignment count returned at the completion of
 502                      * execution" even if it wasn't suppressed with the
 503                      * '*' flag.  The Corrigendum to the standard seems
 504                      * to contradict this (comment out the assignment to
 505                      * suppress below if you want to implement these
 506                      * alternate semantics) but the windows program I'm
 507                      * looking at expects the behavior I've coded here
 508                      * (which happens to be what glibc does as well).
 509                      */
 510                     suppress = 1;
 511                     st = 1;
 512                 }
 513                 break;
 514             case '[': {
 515                     _CHAR_ *str = suppress ? NULL : va_arg(ap, _CHAR_*);
 516                     _CHAR_ *sptr = str;
 517                     RTL_BITMAP bitMask;
 518                     ULONG *Mask;
 519                     int invert = 0; /* Set if we are NOT to find the chars */
 520 #ifdef SECURE
 521                     unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(_CHAR_);
 522 #else
 523                     unsigned size = UINT_MAX;
 524 #endif
 525
 526                     /* Init our bitmap */
 527                     Mask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, _BITMAPSIZE_/8);
 528                     RtlInitializeBitMap(&bitMask, Mask, _BITMAPSIZE_);
 529
 530                     /* Read the format */
 531                     format++;
 532                     if(*format == '^') {
 533                         invert = 1;
 534                         format++;
 535                     }
 536                     if(*format == ']') {
 537                         RtlSetBits(&bitMask, ']', 1);
 538                         format++;
 539                     }
 540                     while(*format && (*format != ']')) {
 541                         /* According to msdn:
 542                          * "Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]." */
 543                         if((*format == '-') && (*(format + 1) != ']')) {
 544                             if ((*(format - 1)) < *(format + 1))
 545                                 RtlSetBits(&bitMask, *(format - 1) +1 , *(format + 1) - *(format - 1));
 546                             else
 547                                 RtlSetBits(&bitMask, *(format + 1)    , *(format - 1) - *(format + 1));
 548                             format++;
 549                         } else
 550                             RtlSetBits(&bitMask, *format, 1);
 551                         format++;
 552                     }
 553                     /* read until char is not suitable */
 554                     while ((width != 0) && (nch != _EOF_)) {
 555                         if(!invert) {
 556                             if(RtlAreBitsSet(&bitMask, nch, 1)) {
 557                                 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
 558                             } else
 559                                 break;
 560                         } else {
 561                             if(RtlAreBitsClear(&bitMask, nch, 1)) {
 562                                 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
 563                             } else
 564                                 break;
 565                         }
 566                         st++;
 567                         nch = _GETC_(file);
 568                         if (width>0) width--;
 569                         if(size>1) size--;
 570                         else {
 571                             *str = 0;
 572                             return rd;
 573                         }
 574                     }
 575                     /* terminate */
 576                     if (!suppress) *sptr = 0;
 577                     HeapFree(GetProcessHeap(), 0, Mask);
 578                 }
 579                 break;
 580             default:
 581                 /* From spec: "if a percent sign is followed by a character
 582                  * that has no meaning as a format-control character, that
 583                  * character and the following characters are treated as
 584                  * an ordinary sequence of characters, that is, a sequence
 585                  * of characters that must match the input.  For example,
 586                  * to specify that a percent-sign character is to be input,
 587                  * use %%." */
 588                 while ((nch!=_EOF_) && _ISSPACE_(nch))
 589                     nch = _GETC_(file);
 590                 if (nch==*format) {
 591                     suppress = 1; /* whoops no field to be read */
 592                     st = 1; /* but we got what we expected */
 593                     nch = _GETC_(file);
 594                 }
 595                 break;
 596             }
 597             if (st && !suppress) rd++;
 598             else if (!st) break;
 599         }
 600         /* a non-white-space character causes scanf to read, but not store,
 601          * a matching non-white-space character. */
 602         else {
 603             /* check for character match */
 604             if (nch == *format) {
 605                 nch = _GETC_(file);
 606             } else break;
 607         }
 608         format++;
 609     }
 610     if (nch!=_EOF_) {
 611         _UNGETC_(nch, file);
 612     }
 613     TRACE("returning %d\n", rd);
 614     return rd;
 615 }
 616
 617 #undef _CHAR_
 618 #undef _EOF_
 619 #undef _EOF_RET
 620 #undef _ISSPACE_
 621 #undef _ISDIGIT_
 622 #undef _CHAR2SUPPORTED_
 623 #undef _WIDE2SUPPORTED_
 624 #undef _CHAR2DIGIT_
 625 #undef _GETC_
 626 #undef _UNGETC_
 627 #undef _FUNCTION_
 628 #undef _BITMAPSIZE_