lib/libc/stdio/vfwscanf.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Chris Torek.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #if 0
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)vfscanf.c   8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #endif
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 #include "namespace.h"
  42 #include <ctype.h>
  43 #include <inttypes.h>
  44 #include <limits.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <stddef.h>
  48 #include <stdarg.h>
  49 #include <string.h>
  50 #include <wchar.h>
  51 #include <wctype.h>
  52 #include "un-namespace.h"
  53
  54 #include "libc_private.h"
  55 #include "local.h"
  56
  57 #ifndef NO_FLOATING_POINT
  58 #include <locale.h>
  59 #endif
  60
  61 #define BUF             513     /* Maximum length of numeric string. */
  62
  63 /*
  64  * Flags used during conversion.
  65  */
  66 #define LONG            0x01    /* l: long or double */
  67 #define LONGDBL         0x02    /* L: long double */
  68 #define SHORT           0x04    /* h: short */
  69 #define SUPPRESS        0x08    /* *: suppress assignment */
  70 #define POINTER         0x10    /* p: void * (as hex) */
  71 #define NOSKIP          0x20    /* [ or c: do not skip blanks */
  72 #define LONGLONG        0x400   /* ll: long long (+ deprecated q: quad) */
  73 #define INTMAXT         0x800   /* j: intmax_t */
  74 #define PTRDIFFT        0x1000  /* t: ptrdiff_t */
  75 #define SIZET           0x2000  /* z: size_t */
  76 #define SHORTSHORT      0x4000  /* hh: char */
  77 #define UNSIGNED        0x8000  /* %[oupxX] conversions */
  78
  79 /*
  80  * The following are used in integral conversions only:
  81  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
  82  */
  83 #define SIGNOK          0x40    /* +/- is (still) legal */
  84 #define NDIGITS         0x80    /* no digits detected */
  85 #define PFXOK           0x100   /* 0x prefix is (still) legal */
  86 #define NZDIGITS        0x200   /* no zero digits detected */
  87 #define HAVESIGN        0x10000 /* sign detected */
  88
  89 /*
  90  * Conversion types.
  91  */
  92 #define CT_CHAR         0       /* %c conversion */
  93 #define CT_CCL          1       /* %[...] conversion */
  94 #define CT_STRING       2       /* %s conversion */
  95 #define CT_INT          3       /* %[dioupxX] conversion */
  96 #define CT_FLOAT        4       /* %[efgEFG] conversion */
  97
  98 #ifndef NO_FLOATING_POINT
  99 static int parsefloat(FILE *, wchar_t *, wchar_t *);
 100 #endif
 101
 102 extern int __scanfdebug;
 103
 104 #define INCCL(_c)       \
 105         (cclcompl ? (wmemchr(ccls, (_c), ccle - ccls) == NULL) : \
 106         (wmemchr(ccls, (_c), ccle - ccls) != NULL))
 107
 108 /*
 109  * MT-safe version.
 110  */
 111 int
 112 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 113 {
 114         int ret;
 115
 116         FLOCKFILE(fp);
 117         ORIENT(fp, 1);
 118         ret = __vfwscanf(fp, fmt, ap);
 119         FUNLOCKFILE(fp);
 120         return (ret);
 121 }
 122
 123 /*
 124  * Non-MT-safe version.
 125  */
 126 int
 127 __vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 128 {
 129         wint_t c;               /* character from format, or conversion */
 130         size_t width;           /* field width, or 0 */
 131         wchar_t *p;             /* points into all kinds of strings */
 132         int n;                  /* handy integer */
 133         int flags;              /* flags as defined above */
 134         wchar_t *p0;            /* saves original value of p when necessary */
 135         int nassigned;          /* number of fields assigned */
 136         int nconversions;       /* number of conversions */
 137         int nread;              /* number of characters consumed from fp */
 138         int base;               /* base argument to conversion function */
 139         wchar_t buf[BUF];       /* buffer for numeric conversions */
 140         const wchar_t *ccls;    /* character class start */
 141         const wchar_t *ccle;    /* character class end */
 142         int cclcompl;           /* ccl is complemented? */
 143         wint_t wi;              /* handy wint_t */
 144         char *mbp;              /* multibyte string pointer for %c %s %[ */
 145         size_t nconv;           /* number of bytes in mb. conversion */
 146         char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */
 147         static const mbstate_t initial;
 148         mbstate_t mbs;
 149
 150         /* `basefix' is used to avoid `if' tests in the integer scanner */
 151         static short basefix[17] =
 152                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
 153
 154         nassigned = 0;
 155         nconversions = 0;
 156         nread = 0;
 157         ccls = ccle = NULL;
 158         for (;;) {
 159                 c = *fmt++;
 160                 if (c == 0)
 161                         return (nassigned);
 162                 if (iswspace(c)) {
 163                         while ((c = __fgetwc(fp)) != WEOF &&
 164                             iswspace(c))
 165                                 ;
 166                         if (c != WEOF)
 167                                 __ungetwc(c, fp);
 168                         continue;
 169                 }
 170                 if (c != '%')
 171                         goto literal;
 172                 width = 0;
 173                 flags = 0;
 174                 /*
 175                  * switch on the format.  continue if done;
 176                  * break once format type is derived.
 177                  */
 178 again:          c = *fmt++;
 179                 switch (c) {
 180                 case '%':
 181 literal:
 182                         if ((wi = __fgetwc(fp)) == WEOF)
 183                                 goto input_failure;
 184                         if (wi != c) {
 185                                 __ungetwc(wi, fp);
 186                                 goto input_failure;
 187                         }
 188                         nread++;
 189                         continue;
 190
 191                 case '*':
 192                         flags |= SUPPRESS;
 193                         goto again;
 194                 case 'j':
 195                         flags |= INTMAXT;
 196                         goto again;
 197                 case 'l':
 198                         if (flags & LONG) {
 199                                 flags &= ~LONG;
 200                                 flags |= LONGLONG;
 201                         } else
 202                                 flags |= LONG;
 203                         goto again;
 204                 case 'q':
 205                         flags |= LONGLONG;      /* not quite */
 206                         goto again;
 207                 case 't':
 208                         flags |= PTRDIFFT;
 209                         goto again;
 210                 case 'z':
 211                         flags |= SIZET;
 212                         goto again;
 213                 case 'L':
 214                         flags |= LONGDBL;
 215                         goto again;
 216                 case 'h':
 217                         if (flags & SHORT) {
 218                                 flags &= ~SHORT;
 219                                 flags |= SHORTSHORT;
 220                         } else
 221                                 flags |= SHORT;
 222                         goto again;
 223
 224                 case '0': case '1': case '2': case '3': case '4':
 225                 case '5': case '6': case '7': case '8': case '9':
 226                         width = width * 10 + c - '0';
 227                         goto again;
 228
 229                 /*
 230                  * Conversions.
 231                  */
 232                 case 'd':
 233                         c = CT_INT;
 234                         base = 10;
 235                         break;
 236
 237                 case 'i':
 238                         c = CT_INT;
 239                         base = 0;
 240                         break;
 241
 242                 case 'o':
 243                         c = CT_INT;
 244                         flags |= UNSIGNED;
 245                         base = 8;
 246                         break;
 247
 248                 case 'u':
 249                         c = CT_INT;
 250                         flags |= UNSIGNED;
 251                         base = 10;
 252                         break;
 253
 254                 case 'X':
 255                 case 'x':
 256                         flags |= PFXOK; /* enable 0x prefixing */
 257                         c = CT_INT;
 258                         flags |= UNSIGNED;
 259                         base = 16;
 260                         break;
 261
 262 #ifndef NO_FLOATING_POINT
 263                 case 'A': case 'E': case 'F': case 'G':
 264                 case 'a': case 'e': case 'f': case 'g':
 265                         c = CT_FLOAT;
 266                         break;
 267 #endif
 268
 269                 case 'S':
 270                         flags |= LONG;
 271                         /* FALLTHROUGH */
 272                 case 's':
 273                         c = CT_STRING;
 274                         break;
 275
 276                 case '[':
 277                         ccls = fmt;
 278                         if (*fmt == '^') {
 279                                 cclcompl = 1;
 280                                 fmt++;
 281                         } else
 282                                 cclcompl = 0;
 283                         if (*fmt == ']')
 284                                 fmt++;
 285                         while (*fmt != '\0' && *fmt != ']')
 286                                 fmt++;
 287                         ccle = fmt;
 288                         fmt++;
 289                         flags |= NOSKIP;
 290                         c = CT_CCL;
 291                         break;
 292
 293                 case 'C':
 294                         flags |= LONG;
 295                         /* FALLTHROUGH */
 296                 case 'c':
 297                         flags |= NOSKIP;
 298                         c = CT_CHAR;
 299                         break;
 300
 301                 case 'p':       /* pointer format is like hex */
 302                         flags |= POINTER | PFXOK;
 303                         c = CT_INT;             /* assumes sizeof(uintmax_t) */
 304                         flags |= UNSIGNED;      /*      >= sizeof(uintptr_t) */
 305                         base = 16;
 306                         break;
 307
 308                 case 'n':
 309                         nconversions++;
 310                         if (flags & SUPPRESS)   /* ??? */
 311                                 continue;
 312                         if (flags & SHORTSHORT)
 313                                 *va_arg(ap, char *) = nread;
 314                         else if (flags & SHORT)
 315                                 *va_arg(ap, short *) = nread;
 316                         else if (flags & LONG)
 317                                 *va_arg(ap, long *) = nread;
 318                         else if (flags & LONGLONG)
 319                                 *va_arg(ap, long long *) = nread;
 320                         else if (flags & INTMAXT)
 321                                 *va_arg(ap, intmax_t *) = nread;
 322                         else if (flags & SIZET)
 323                                 *va_arg(ap, size_t *) = nread;
 324                         else if (flags & PTRDIFFT)
 325                                 *va_arg(ap, ptrdiff_t *) = nread;
 326                         else
 327                                 *va_arg(ap, int *) = nread;
 328                         continue;
 329
 330                 default:
 331                         goto match_failure;
 332
 333                 /*
 334                  * Disgusting backwards compatibility hack.     XXX
 335                  */
 336                 case '\0':      /* compat */
 337                         return (EOF);
 338                 }
 339
 340                 /*
 341                  * Consume leading white space, except for formats
 342                  * that suppress this.
 343                  */
 344                 if ((flags & NOSKIP) == 0) {
 345                         while ((wi = __fgetwc(fp)) != WEOF && iswspace(wi))
 346                                 nread++;
 347                         if (wi == WEOF)
 348                                 goto input_failure;
 349                         __ungetwc(wi, fp);
 350                 }
 351
 352                 /*
 353                  * Do the conversion.
 354                  */
 355                 switch (c) {
 356
 357                 case CT_CHAR:
 358                         /* scan arbitrary characters (sets NOSKIP) */
 359                         if (width == 0)
 360                                 width = 1;
 361                         if (flags & LONG) {
 362                                 if (!(flags & SUPPRESS))
 363                                         p = va_arg(ap, wchar_t *);
 364                                 n = 0;
 365                                 while (width-- != 0 &&
 366                                     (wi = __fgetwc(fp)) != WEOF) {
 367                                         if (!(flags & SUPPRESS))
 368                                                 *p++ = (wchar_t)wi;
 369                                         n++;
 370                                 }
 371                                 if (n == 0)
 372                                         goto input_failure;
 373                                 nread += n;
 374                                 if (!(flags & SUPPRESS))
 375                                         nassigned++;
 376                         } else {
 377                                 if (!(flags & SUPPRESS))
 378                                         mbp = va_arg(ap, char *);
 379                                 n = 0;
 380                                 mbs = initial;
 381                                 while (width != 0 &&
 382                                     (wi = __fgetwc(fp)) != WEOF) {
 383                                         if (width >= MB_CUR_MAX &&
 384                                             !(flags & SUPPRESS)) {
 385                                                 nconv = wcrtomb(mbp, wi, &mbs);
 386                                                 if (nconv == (size_t)-1)
 387                                                         goto input_failure;
 388                                         } else {
 389                                                 nconv = wcrtomb(mbbuf, wi,
 390                                                     &mbs);
 391                                                 if (nconv == (size_t)-1)
 392                                                         goto input_failure;
 393                                                 if (nconv > width) {
 394                                                         __ungetwc(wi, fp);
 395                                                         break;
 396                                                 }
 397                                                 if (!(flags & SUPPRESS))
 398                                                         memcpy(mbp, mbbuf,
 399                                                             nconv);
 400                                         }
 401                                         if (!(flags & SUPPRESS))
 402                                                 mbp += nconv;
 403                                         width -= nconv;
 404                                         n++;
 405                                 }
 406                                 if (n == 0)
 407                                         goto input_failure;
 408                                 nread += n;
 409                                 if (!(flags & SUPPRESS))
 410                                         nassigned++;
 411                         }
 412                         nconversions++;
 413                         break;
 414
 415                 case CT_CCL:
 416                         /* scan a (nonempty) character class (sets NOSKIP) */
 417                         if (width == 0)
 418                                 width = (size_t)~0;     /* `infinity' */
 419                         /* take only those things in the class */
 420                         if ((flags & SUPPRESS) && (flags & LONG)) {
 421                                 n = 0;
 422                                 while ((wi = __fgetwc(fp)) != WEOF &&
 423                                     width-- != 0 && INCCL(wi))
 424                                         n++;
 425                                 if (wi != WEOF)
 426                                         __ungetwc(wi, fp);
 427                                 if (n == 0)
 428                                         goto match_failure;
 429                         } else if (flags & LONG) {
 430                                 p0 = p = va_arg(ap, wchar_t *);
 431                                 while ((wi = __fgetwc(fp)) != WEOF &&
 432                                     width-- != 0 && INCCL(wi))
 433                                         *p++ = (wchar_t)wi;
 434                                 if (wi != WEOF)
 435                                         __ungetwc(wi, fp);
 436                                 n = p - p0;
 437                                 if (n == 0)
 438                                         goto match_failure;
 439                                 *p = 0;
 440                                 nassigned++;
 441                         } else {
 442                                 if (!(flags & SUPPRESS))
 443                                         mbp = va_arg(ap, char *);
 444                                 n = 0;
 445                                 mbs = initial;
 446                                 while ((wi = __fgetwc(fp)) != WEOF &&
 447                                     width != 0 && INCCL(wi)) {
 448                                         if (width >= MB_CUR_MAX &&
 449                                            !(flags & SUPPRESS)) {
 450                                                 nconv = wcrtomb(mbp, wi, &mbs);
 451                                                 if (nconv == (size_t)-1)
 452                                                         goto input_failure;
 453                                         } else {
 454                                                 nconv = wcrtomb(mbbuf, wi,
 455                                                     &mbs);
 456                                                 if (nconv == (size_t)-1)
 457                                                         goto input_failure;
 458                                                 if (nconv > width)
 459                                                         break;
 460                                                 if (!(flags & SUPPRESS))
 461                                                         memcpy(mbp, mbbuf,
 462                                                             nconv);
 463                                         }
 464                                         if (!(flags & SUPPRESS))
 465                                                 mbp += nconv;
 466                                         width -= nconv;
 467                                         n++;
 468                                 }
 469                                 if (wi != WEOF)
 470                                         __ungetwc(wi, fp);
 471                                 if (!(flags & SUPPRESS)) {
 472                                         *mbp = 0;
 473                                         nassigned++;
 474                                 }
 475                         }
 476                         nread += n;
 477                         nconversions++;
 478                         break;
 479
 480                 case CT_STRING:
 481                         /* like CCL, but zero-length string OK, & no NOSKIP */
 482                         if (width == 0)
 483                                 width = (size_t)~0;
 484                         if ((flags & SUPPRESS) && (flags & LONG)) {
 485                                 while ((wi = __fgetwc(fp)) != WEOF &&
 486                                     width-- != 0 &&
 487                                     !iswspace(wi))
 488                                         nread++;
 489                                 if (wi != WEOF)
 490                                         __ungetwc(wi, fp);
 491                         } else if (flags & LONG) {
 492                                 p0 = p = va_arg(ap, wchar_t *);
 493                                 while ((wi = __fgetwc(fp)) != WEOF &&
 494                                     width-- != 0 &&
 495                                     !iswspace(wi)) {
 496                                         *p++ = (wchar_t)wi;
 497                                         nread++;
 498                                 }
 499                                 if (wi != WEOF)
 500                                         __ungetwc(wi, fp);
 501                                 *p = '\0';
 502                                 nassigned++;
 503                         } else {
 504                                 if (!(flags & SUPPRESS))
 505                                         mbp = va_arg(ap, char *);
 506                                 mbs = initial;
 507                                 while ((wi = __fgetwc(fp)) != WEOF &&
 508                                     width != 0 &&
 509                                     !iswspace(wi)) {
 510                                         if (width >= MB_CUR_MAX &&
 511                                             !(flags & SUPPRESS)) {
 512                                                 nconv = wcrtomb(mbp, wi, &mbs);
 513                                                 if (nconv == (size_t)-1)
 514                                                         goto input_failure;
 515                                         } else {
 516                                                 nconv = wcrtomb(mbbuf, wi,
 517                                                     &mbs);
 518                                                 if (nconv == (size_t)-1)
 519                                                         goto input_failure;
 520                                                 if (nconv > width)
 521                                                         break;
 522                                                 if (!(flags & SUPPRESS))
 523                                                         memcpy(mbp, mbbuf,
 524                                                             nconv);
 525                                         }
 526                                         if (!(flags & SUPPRESS))
 527                                                 mbp += nconv;
 528                                         width -= nconv;
 529                                         nread++;
 530                                 }
 531                                 if (wi != WEOF)
 532                                         __ungetwc(wi, fp);
 533                                 if (!(flags & SUPPRESS)) {
 534                                         *mbp = 0;
 535                                         nassigned++;
 536                                 }
 537                         }
 538                         nconversions++;
 539                         continue;
 540
 541                 case CT_INT:
 542                         /* scan an integer as if by the conversion function */
 543                         if (width == 0 || width > sizeof(buf) /
 544                             sizeof(*buf) - 1)
 545                                 width = sizeof(buf) / sizeof(*buf) - 1;
 546                         flags |= SIGNOK | NDIGITS | NZDIGITS;
 547                         for (p = buf; width; width--) {
 548                                 c = __fgetwc(fp);
 549                                 /*
 550                                  * Switch on the character; `goto ok'
 551                                  * if we accept it as a part of number.
 552                                  */
 553                                 switch (c) {
 554
 555                                 /*
 556                                  * The digit 0 is always legal, but is
 557                                  * special.  For %i conversions, if no
 558                                  * digits (zero or nonzero) have been
 559                                  * scanned (only signs), we will have
 560                                  * base==0.  In that case, we should set
 561                                  * it to 8 and enable 0x prefixing.
 562                                  * Also, if we have not scanned zero digits
 563                                  * before this, do not turn off prefixing
 564                                  * (someone else will turn it off if we
 565                                  * have scanned any nonzero digits).
 566                                  */
 567                                 case '0':
 568                                         if (base == 0) {
 569                                                 base = 8;
 570                                                 flags |= PFXOK;
 571                                         }
 572                                         if (flags & NZDIGITS)
 573                                             flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
 574                                         else
 575                                             flags &= ~(SIGNOK|PFXOK|NDIGITS);
 576                                         goto ok;
 577
 578                                 /* 1 through 7 always legal */
 579                                 case '1': case '2': case '3':
 580                                 case '4': case '5': case '6': case '7':
 581                                         base = basefix[base];
 582                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 583                                         goto ok;
 584
 585                                 /* digits 8 and 9 ok iff decimal or hex */
 586                                 case '8': case '9':
 587                                         base = basefix[base];
 588                                         if (base <= 8)
 589                                                 break;  /* not legal here */
 590                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 591                                         goto ok;
 592
 593                                 /* letters ok iff hex */
 594                                 case 'A': case 'B': case 'C':
 595                                 case 'D': case 'E': case 'F':
 596                                 case 'a': case 'b': case 'c':
 597                                 case 'd': case 'e': case 'f':
 598                                         /* no need to fix base here */
 599                                         if (base <= 10)
 600                                                 break;  /* not legal here */
 601                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 602                                         goto ok;
 603
 604                                 /* sign ok only as first character */
 605                                 case '+': case '-':
 606                                         if (flags & SIGNOK) {
 607                                                 flags &= ~SIGNOK;
 608                                                 flags |= HAVESIGN;
 609                                                 goto ok;
 610                                         }
 611                                         break;
 612
 613                                 /*
 614                                  * x ok iff flag still set & 2nd char (or
 615                                  * 3rd char if we have a sign).
 616                                  */
 617                                 case 'x': case 'X':
 618                                         if (flags & PFXOK && p ==
 619                                             buf + 1 + !!(flags & HAVESIGN)) {
 620                                                 base = 16;      /* if %i */
 621                                                 flags &= ~PFXOK;
 622                                                 goto ok;
 623                                         }
 624                                         break;
 625                                 }
 626
 627                                 /*
 628                                  * If we got here, c is not a legal character
 629                                  * for a number.  Stop accumulating digits.
 630                                  */
 631                                 if (c != WEOF)
 632                                         __ungetwc(c, fp);
 633                                 break;
 634                 ok:
 635                                 /*
 636                                  * c is legal: store it and look at the next.
 637                                  */
 638                                 *p++ = (wchar_t)c;
 639                         }
 640                         /*
 641                          * If we had only a sign, it is no good; push
 642                          * back the sign.  If the number ends in `x',
 643                          * it was [sign] '0' 'x', so push back the x
 644                          * and treat it as [sign] '0'.
 645                          */
 646                         if (flags & NDIGITS) {
 647                                 if (p > buf)
 648                                         __ungetwc(*--p, fp);
 649                                 goto match_failure;
 650                         }
 651                         c = p[-1];
 652                         if (c == 'x' || c == 'X') {
 653                                 --p;
 654                                 __ungetwc(c, fp);
 655                         }
 656                         if ((flags & SUPPRESS) == 0) {
 657                                 uintmax_t res;
 658
 659                                 *p = 0;
 660                                 if ((flags & UNSIGNED) == 0)
 661                                     res = wcstoimax(buf, NULL, base);
 662                                 else
 663                                     res = wcstoumax(buf, NULL, base);
 664                                 if (flags & POINTER)
 665                                         *va_arg(ap, void **) =
 666                                                         (void *)(uintptr_t)res;
 667                                 else if (flags & SHORTSHORT)
 668                                         *va_arg(ap, char *) = res;
 669                                 else if (flags & SHORT)
 670                                         *va_arg(ap, short *) = res;
 671                                 else if (flags & LONG)
 672                                         *va_arg(ap, long *) = res;
 673                                 else if (flags & LONGLONG)
 674                                         *va_arg(ap, long long *) = res;
 675                                 else if (flags & INTMAXT)
 676                                         *va_arg(ap, intmax_t *) = res;
 677                                 else if (flags & PTRDIFFT)
 678                                         *va_arg(ap, ptrdiff_t *) = res;
 679                                 else if (flags & SIZET)
 680                                         *va_arg(ap, size_t *) = res;
 681                                 else
 682                                         *va_arg(ap, int *) = res;
 683                                 nassigned++;
 684                         }
 685                         nread += p - buf;
 686                         nconversions++;
 687                         break;
 688
 689 #ifndef NO_FLOATING_POINT
 690                 case CT_FLOAT:
 691                         /* scan a floating point number as if by strtod */
 692                         if (width == 0 || width > sizeof(buf) /
 693                             sizeof(*buf) - 1)
 694                                 width = sizeof(buf) / sizeof(*buf) - 1;
 695                         if ((width = parsefloat(fp, buf, buf + width)) == 0)
 696                                 goto match_failure;
 697                         if ((flags & SUPPRESS) == 0) {
 698                                 if (flags & LONGDBL) {
 699                                         long double res = wcstold(buf, &p);
 700                                         *va_arg(ap, long double *) = res;
 701                                 } else if (flags & LONG) {
 702                                         double res = wcstod(buf, &p);
 703                                         *va_arg(ap, double *) = res;
 704                                 } else {
 705                                         float res = wcstof(buf, &p);
 706                                         *va_arg(ap, float *) = res;
 707                                 }
 708                                 if (__scanfdebug && p - buf != width)
 709                                         abort();
 710                                 nassigned++;
 711                         }
 712                         nread += width;
 713                         nconversions++;
 714                         break;
 715 #endif /* !NO_FLOATING_POINT */
 716                 }
 717         }
 718 input_failure:
 719         return (nconversions != 0 ? nassigned : EOF);
 720 match_failure:
 721         return (nassigned);
 722 }
 723
 724 #ifndef NO_FLOATING_POINT
 725 static int
 726 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end)
 727 {
 728         wchar_t *commit, *p;
 729         int infnanpos = 0;
 730         enum {
 731                 S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX,
 732                 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
 733         } state = S_START;
 734         wchar_t c;
 735         wchar_t decpt = (wchar_t)(unsigned char)*localeconv()->decimal_point;
 736         _Bool gotmantdig = 0, ishex = 0;
 737
 738         /*
 739          * We set commit = p whenever the string we have read so far
 740          * constitutes a valid representation of a floating point
 741          * number by itself.  At some point, the parse will complete
 742          * or fail, and we will ungetc() back to the last commit point.
 743          * To ensure that the file offset gets updated properly, it is
 744          * always necessary to read at least one character that doesn't
 745          * match; thus, we can't short-circuit "infinity" or "nan(...)".
 746          */
 747         commit = buf - 1;
 748         c = WEOF;
 749         for (p = buf; p < end; ) {
 750                 if ((c = __fgetwc(fp)) == WEOF)
 751                         break;
 752 reswitch:
 753                 switch (state) {
 754                 case S_START:
 755                         state = S_GOTSIGN;
 756                         if (c == '-' || c == '+')
 757                                 break;
 758                         else
 759                                 goto reswitch;
 760                 case S_GOTSIGN:
 761                         switch (c) {
 762                         case '0':
 763                                 state = S_MAYBEHEX;
 764                                 commit = p;
 765                                 break;
 766                         case 'I':
 767                         case 'i':
 768                                 state = S_INF;
 769                                 break;
 770                         case 'N':
 771                         case 'n':
 772                                 state = S_NAN;
 773                                 break;
 774                         default:
 775                                 state = S_DIGITS;
 776                                 goto reswitch;
 777                         }
 778                         break;
 779                 case S_INF:
 780                         if (infnanpos > 6 ||
 781                             (c != "nfinity"[infnanpos] &&
 782                              c != "NFINITY"[infnanpos]))
 783                                 goto parsedone;
 784                         if (infnanpos == 1 || infnanpos == 6)
 785                                 commit = p;     /* inf or infinity */
 786                         infnanpos++;
 787                         break;
 788                 case S_NAN:
 789                         switch (infnanpos) {
 790                         case -1:        /* XXX kludge to deal with nan(...) */
 791                                 goto parsedone;
 792                         case 0:
 793                                 if (c != 'A' && c != 'a')
 794                                         goto parsedone;
 795                                 break;
 796                         case 1:
 797                                 if (c != 'N' && c != 'n')
 798                                         goto parsedone;
 799                                 else
 800                                         commit = p;
 801                                 break;
 802                         case 2:
 803                                 if (c != '(')
 804                                         goto parsedone;
 805                                 break;
 806                         default:
 807                                 if (c == ')') {
 808                                         commit = p;
 809                                         infnanpos = -2;
 810                                 } else if (!iswalnum(c) && c != '_')
 811                                         goto parsedone;
 812                                 break;
 813                         }
 814                         infnanpos++;
 815                         break;
 816                 case S_MAYBEHEX:
 817                         state = S_DIGITS;
 818                         if (c == 'X' || c == 'x') {
 819                                 ishex = 1;
 820                                 break;
 821                         } else {        /* we saw a '0', but no 'x' */
 822                                 gotmantdig = 1;
 823                                 goto reswitch;
 824                         }
 825                 case S_DIGITS:
 826                         if ((ishex && iswxdigit(c)) || iswdigit(c))
 827                                 gotmantdig = 1;
 828                         else {
 829                                 state = S_FRAC;
 830                                 if (c != decpt)
 831                                         goto reswitch;
 832                         }
 833                         if (gotmantdig)
 834                                 commit = p;
 835                         break;
 836                 case S_FRAC:
 837                         if (((c == 'E' || c == 'e') && !ishex) ||
 838                             ((c == 'P' || c == 'p') && ishex)) {
 839                                 if (!gotmantdig)
 840                                         goto parsedone;
 841                                 else
 842                                         state = S_EXP;
 843                         } else if ((ishex && iswxdigit(c)) || iswdigit(c)) {
 844                                 commit = p;
 845                                 gotmantdig = 1;
 846                         } else
 847                                 goto parsedone;
 848                         break;
 849                 case S_EXP:
 850                         state = S_EXPDIGITS;
 851                         if (c == '-' || c == '+')
 852                                 break;
 853                         else
 854                                 goto reswitch;
 855                 case S_EXPDIGITS:
 856                         if (iswdigit(c))
 857                                 commit = p;
 858                         else
 859                                 goto parsedone;
 860                         break;
 861                 default:
 862                         abort();
 863                 }
 864                 *p++ = c;
 865                 c = WEOF;
 866         }
 867
 868 parsedone:
 869         if (c != WEOF)
 870                 __ungetwc(c, fp);
 871         while (commit < --p)
 872                 __ungetwc(*p, fp);
 873         *++commit = '\0';
 874         return (commit - buf);
 875 }
 876 #endif