StdLib/LibC/Stdio/vfwscanf.c

   1 /*-
   2   Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
   3   This program and the accompanying materials are licensed and made available under
   4   the terms and conditions of the BSD License that accompanies this distribution.
   5   The full text of the license may be found at
   6   http://opensource.org/licenses/bsd-license.
   7
   8   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   9   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  10
  11  * Copyright (c) 1990, 1993
  12  *  The Regents of the University of California.  All rights reserved.
  13  *
  14  * This code is derived from software contributed to Berkeley by
  15  * Chris Torek.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions
  19  * are met:
  20  * 1. Redistributions of source code must retain the above copyright
  21  *    notice, this list of conditions and the following disclaimer.
  22  * 2. Redistributions in binary form must reproduce the above copyright
  23  *    notice, this list of conditions and the following disclaimer in the
  24  *    documentation and/or other materials provided with the distribution.
  25  * 3. All advertising materials mentioning features or use of this software
  26  *    must display the following acknowledgement:
  27  *  This product includes software developed by the University of
  28  *  California, Berkeley and its contributors.
  29  * 4. Neither the name of the University nor the names of its contributors
  30  *    may be used to endorse or promote products derived from this software
  31  *    without specific prior written permission.
  32  *
  33  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  34  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  35  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  36  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  37  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  41  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  42  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  43  * SUCH DAMAGE.
  44
  45   FreeBSD: src/lib/libc/stdio/vfwscanf.c,v 1.12 2004/05/02 20:13:29 obrien Exp
  46   NetBSD: vfwscanf.c,v 1.2 2005/06/12 05:48:41 lukem Exp
  47  */
  48 #include  <LibConfig.h>
  49 #include  <sys/EfiCdefs.h>
  50
  51 #include  "namespace.h"
  52 #include  <ctype.h>
  53 #include  <inttypes.h>
  54 #include  <stdio.h>
  55 #include  <stdlib.h>
  56 #include  <stddef.h>
  57 #include  <stdarg.h>
  58 #include  <string.h>
  59 #include  <limits.h>
  60 #include  <wchar.h>
  61 #include  <wctype.h>
  62
  63 #include  "reentrant.h"
  64 #include  "local.h"
  65
  66 #ifndef NO_FLOATING_POINT
  67 #include  <locale.h>
  68 #endif
  69
  70 #if defined(_MSC_VER)           /* Handle Microsoft VC++ compiler specifics. */
  71   #pragma warning ( disable : 4244 )  // Allow wint_t to wchar_t conversions
  72   #pragma warning ( disable : 4305 )  // Allow truncation from UINT64 to void*
  73   #pragma warning ( disable : 4701 )  // Disable false warning for local variable p near line 375
  74 #endif
  75
  76
  77 #define BUF   513 /* Maximum length of numeric string. */
  78
  79 /*
  80  * Flags used during conversion.
  81  */
  82 #define LONG        0x01    /* l: long or double */
  83 #define LONGDBL     0x02    /* L: long double */
  84 #define SHORT       0x04    /* h: short */
  85 #define SUPPRESS    0x08    /* *: suppress assignment */
  86 #define POINTER     0x10    /* p: void * (as hex) */
  87 #define NOSKIP      0x20    /* [ or c: do not skip blanks */
  88 #define LONGLONG    0x400   /* ll: quad_t (+ deprecated q: quad) */
  89 #define INTMAXT     0x800   /* j: intmax_t */
  90 #define PTRDIFFT    0x1000  /* t: ptrdiff_t */
  91 #define SIZET       0x2000  /* z: size_t */
  92 #define SHORTSHORT  0x4000  /* hh: char */
  93 #define UNSIGNED    0x8000  /* %[oupxX] conversions */
  94
  95 /*
  96  * The following are used in integral conversions only:
  97  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
  98  */
  99 #define SIGNOK    0x40  /* +/- is (still) legal */
 100 #define NDIGITS   0x80  /* no digits detected */
 101 #define PFXOK   0x100 /* 0x prefix is (still) legal */
 102 #define NZDIGITS  0x200 /* no zero digits detected */
 103 #define HAVESIGN  0x10000 /* sign detected */
 104
 105 /*
 106  * Conversion types.
 107  */
 108 #define CT_CHAR   0 /* %c conversion */
 109 #define CT_CCL    1 /* %[...] conversion */
 110 #define CT_STRING 2 /* %s conversion */
 111 #define CT_INT    3 /* %[dioupxX] conversion */
 112 #define CT_FLOAT  4 /* %[efgEFG] conversion */
 113
 114 static int parsefloat(FILE *, wchar_t *, wchar_t *);
 115
 116 #define INCCL(_c) \
 117   (cclcompl ? (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) == NULL) : \
 118   (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) != NULL))
 119
 120 /*
 121  * MT-safe version.
 122  */
 123 int
 124 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 125 {
 126   int ret;
 127
 128   FLOCKFILE(fp);
 129   _SET_ORIENTATION(fp, 1);
 130   ret = __vfwscanf_unlocked(fp, fmt, ap);
 131   FUNLOCKFILE(fp);
 132   return (ret);
 133 }
 134
 135 /*
 136  * Non-MT-safe version.
 137  */
 138 int
 139 __vfwscanf_unlocked(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 140 {
 141   wint_t c;   /* character from format, or conversion */
 142   size_t width;   /* field width, or 0 */
 143   wchar_t *p;   /* points into all kinds of strings */
 144   int n;      /* handy integer */
 145   int flags;    /* flags as defined above */
 146   wchar_t *p0;    /* saves original value of p when necessary */
 147   int nassigned;    /* number of fields assigned */
 148   int nconversions; /* number of conversions */
 149   int nread;    /* number of characters consumed from fp */
 150   int base;   /* base argument to conversion function */
 151   wchar_t buf[BUF]; /* buffer for numeric conversions */
 152   const wchar_t *ccls;  /* character class start */
 153   const wchar_t *ccle;  /* character class end */
 154   int cclcompl;   /* ccl is complemented? */
 155   wint_t wi;    /* handy wint_t */
 156   char *mbp;    /* multibyte string pointer for %c %s %[ */
 157   size_t nconv;   /* number of bytes in mb. conversion */
 158   char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */
 159   static const mbstate_t initial = { 0 };
 160   mbstate_t mbs;
 161
 162   /* `basefix' is used to avoid `if' tests in the integer scanner */
 163   static short basefix[17] =
 164     { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
 165
 166   nassigned = 0;
 167   nconversions = 0;
 168   nread = 0;
 169   ccls = ccle = NULL;
 170   base = 0;
 171   cclcompl = 0;
 172   mbp = NULL;
 173   for (;;) {
 174     c = *fmt++;
 175     if (c == 0)
 176       return (nassigned);
 177     if (iswspace(c)) {
 178       while ((c = __fgetwc_unlock(fp)) != WEOF &&
 179           iswspace(c))
 180         ;
 181       if (c != WEOF)
 182         ungetwc(c, fp);
 183       continue;
 184     }
 185     if (c != '%')
 186       goto literal;
 187     width = 0;
 188     flags = 0;
 189     /*
 190      * switch on the format.  continue if done;
 191      * break once format type is derived.
 192      */
 193 again:    c = *fmt++;
 194     switch (c) {
 195     case '%':
 196 literal:
 197       if ((wi = __fgetwc_unlock(fp)) == WEOF)
 198         goto input_failure;
 199       if (wi != c) {
 200         ungetwc(wi, fp);
 201         goto match_failure;
 202       }
 203       nread++;
 204       continue;
 205
 206     case '*':
 207       flags |= SUPPRESS;
 208       goto again;
 209     case 'j':
 210       flags |= INTMAXT;
 211       goto again;
 212     case 'l':
 213       if (flags & LONG) {
 214         flags &= ~LONG;
 215         flags |= LONGLONG;
 216       } else
 217         flags |= LONG;
 218       goto again;
 219     case 'q':
 220       flags |= LONGLONG;  /* not quite */
 221       goto again;
 222     case 't':
 223       flags |= PTRDIFFT;
 224       goto again;
 225     case 'z':
 226       flags |= SIZET;
 227       goto again;
 228     case 'L':
 229       flags |= LONGDBL;
 230       goto again;
 231     case 'h':
 232       if (flags & SHORT) {
 233         flags &= ~SHORT;
 234         flags |= SHORTSHORT;
 235       } else
 236         flags |= SHORT;
 237       goto again;
 238
 239     case '0': case '1': case '2': case '3': case '4':
 240     case '5': case '6': case '7': case '8': case '9':
 241       width = width * 10 + c - '0';
 242       goto again;
 243
 244     /*
 245      * Conversions.
 246      */
 247     case 'd':
 248       c = CT_INT;
 249       base = 10;
 250       break;
 251
 252     case 'i':
 253       c = CT_INT;
 254       base = 0;
 255       break;
 256
 257     case 'o':
 258       c = CT_INT;
 259       flags |= UNSIGNED;
 260       base = 8;
 261       break;
 262
 263     case 'u':
 264       c = CT_INT;
 265       flags |= UNSIGNED;
 266       base = 10;
 267       break;
 268
 269     case 'X':
 270     case 'x':
 271       flags |= PFXOK; /* enable 0x prefixing */
 272       c = CT_INT;
 273       flags |= UNSIGNED;
 274       base = 16;
 275       break;
 276
 277 #ifndef NO_FLOATING_POINT
 278     //case 'A':
 279     case 'E': case 'F': case 'G':
 280     //case 'a':
 281     case 'e': case 'f': case 'g':
 282       c = CT_FLOAT;
 283       break;
 284 #endif
 285
 286     case 'S':
 287       flags |= LONG;
 288       /* FALLTHROUGH */
 289     case 's':
 290       c = CT_STRING;
 291       break;
 292
 293     case '[':
 294       ccls = fmt;
 295       if (*fmt == '^') {
 296         cclcompl = 1;
 297         fmt++;
 298       } else
 299         cclcompl = 0;
 300       if (*fmt == ']')
 301         fmt++;
 302       while (*fmt != '\0' && *fmt != ']')
 303         fmt++;
 304       ccle = fmt;
 305       fmt++;
 306       flags |= NOSKIP;
 307       c = CT_CCL;
 308       break;
 309
 310     case 'C':
 311       flags |= LONG;
 312       /* FALLTHROUGH */
 313     case 'c':
 314       flags |= NOSKIP;
 315       c = CT_CHAR;
 316       break;
 317
 318     case 'p': /* pointer format is like hex */
 319       flags |= POINTER | PFXOK;
 320       c = CT_INT;   /* assumes sizeof(uintmax_t) */
 321       flags |= UNSIGNED;  /*      >= sizeof(uintptr_t) */
 322       base = 16;
 323       break;
 324
 325     case 'n':
 326       nconversions++;
 327       if (flags & SUPPRESS) /* ??? */
 328         continue;
 329       if (flags & SHORTSHORT)
 330         *va_arg(ap, char *) = (char)nread;
 331       else if (flags & SHORT)
 332         *va_arg(ap, short *) = (short)nread;
 333       else if (flags & LONG)
 334         *va_arg(ap, long *) = (long)nread;
 335       else if (flags & LONGLONG)
 336         *va_arg(ap, INT64 *) = (INT64)nread;    // was quad_t
 337       else if (flags & INTMAXT)
 338         *va_arg(ap, intmax_t *) = (intmax_t)nread;
 339       else if (flags & SIZET)
 340         *va_arg(ap, size_t *) = (size_t)nread;
 341       else if (flags & PTRDIFFT)
 342         *va_arg(ap, ptrdiff_t *) = (ptrdiff_t)nread;
 343       else
 344         *va_arg(ap, int *) = nread;
 345       continue;
 346
 347     default:
 348       goto match_failure;
 349
 350     /*
 351      * Disgusting backwards compatibility hack. XXX
 352      */
 353     case '\0':  /* compat */
 354       return (EOF);
 355     }
 356
 357     /*
 358      * Consume leading white space, except for formats
 359      * that suppress this.
 360      */
 361     if ((flags & NOSKIP) == 0) {
 362       while ((wi = __fgetwc_unlock(fp)) != WEOF && iswspace(wi))
 363         nread++;
 364       if (wi == WEOF)
 365         goto input_failure;
 366       ungetwc(wi, fp);
 367     }
 368
 369     /*
 370      * Do the conversion.
 371      */
 372     switch (c) {
 373
 374     case CT_CHAR:
 375       /* scan arbitrary characters (sets NOSKIP) */
 376       if (width == 0)
 377         width = 1;
 378       if (flags & LONG) {
 379         if (!(flags & SUPPRESS))
 380           p = va_arg(ap, wchar_t *);
 381         n = 0;
 382         while (width-- != 0 &&
 383             (wi = __fgetwc_unlock(fp)) != WEOF) {
 384           if (!(flags & SUPPRESS))
 385             *p++ = (wchar_t)wi;
 386           n++;
 387         }
 388         if (n == 0)
 389           goto input_failure;
 390         nread += n;
 391         if (!(flags & SUPPRESS))
 392           nassigned++;
 393       } else {
 394         if (!(flags & SUPPRESS))
 395           mbp = va_arg(ap, char *);
 396         n = 0;
 397         mbs = initial;
 398         while (width != 0 &&
 399             (wi = __fgetwc_unlock(fp)) != WEOF) {
 400           if (width >= MB_CUR_MAX &&
 401               !(flags & SUPPRESS)) {
 402             nconv = wcrtomb(mbp, (wchar_t)wi, &mbs);
 403             if (nconv == (size_t)-1)
 404               goto input_failure;
 405           } else {
 406             nconv = wcrtomb(mbbuf, (wchar_t)wi,
 407                 &mbs);
 408             if (nconv == (size_t)-1)
 409               goto input_failure;
 410             if (nconv > width) {
 411               ungetwc(wi, fp);
 412               break;
 413             }
 414             if (!(flags & SUPPRESS))
 415               memcpy(mbp, mbbuf,
 416                   nconv);
 417           }
 418           if (!(flags & SUPPRESS))
 419             mbp += nconv;
 420           width -= nconv;
 421           n++;
 422         }
 423         if (n == 0)
 424           goto input_failure;
 425         nread += n;
 426         if (!(flags & SUPPRESS))
 427           nassigned++;
 428       }
 429       nconversions++;
 430       break;
 431
 432     case CT_CCL:
 433       /* scan a (nonempty) character class (sets NOSKIP) */
 434       if (width == 0)
 435         width = (size_t)~0; /* `infinity' */
 436       /* take only those things in the class */
 437       if ((flags & SUPPRESS) && (flags & LONG)) {
 438         n = 0;
 439         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 440             width-- != 0 && INCCL(wi))
 441           n++;
 442         if (wi != WEOF)
 443           ungetwc(wi, fp);
 444         if (n == 0)
 445           goto match_failure;
 446       } else if (flags & LONG) {
 447         p0 = p = va_arg(ap, wchar_t *);
 448         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 449             width-- != 0 && INCCL(wi))
 450           *p++ = (wchar_t)wi;
 451         if (wi != WEOF)
 452           ungetwc(wi, fp);
 453         n = p - p0;
 454         if (n == 0)
 455           goto match_failure;
 456         *p = 0;
 457         nassigned++;
 458       } else {
 459         if (!(flags & SUPPRESS))
 460           mbp = va_arg(ap, char *);
 461         n = 0;
 462         mbs = initial;
 463         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 464             width != 0 && INCCL(wi)) {
 465           if (width >= MB_CUR_MAX &&
 466              !(flags & SUPPRESS)) {
 467             nconv = wcrtomb(mbp, wi, &mbs);
 468             if (nconv == (size_t)-1)
 469               goto input_failure;
 470           } else {
 471             nconv = wcrtomb(mbbuf, wi,
 472                 &mbs);
 473             if (nconv == (size_t)-1)
 474               goto input_failure;
 475             if (nconv > width)
 476               break;
 477             if (!(flags & SUPPRESS))
 478               memcpy(mbp, mbbuf,
 479                   nconv);
 480           }
 481           if (!(flags & SUPPRESS))
 482             mbp += nconv;
 483           width -= nconv;
 484           n++;
 485         }
 486         if (wi != WEOF)
 487           ungetwc(wi, fp);
 488         if (!(flags & SUPPRESS)) {
 489           *mbp = 0;
 490           nassigned++;
 491         }
 492       }
 493       nread += n;
 494       nconversions++;
 495       break;
 496
 497     case CT_STRING:
 498       /* like CCL, but zero-length string OK, & no NOSKIP */
 499       if (width == 0)
 500         width = (size_t)~0;
 501       if ((flags & SUPPRESS) && (flags & LONG)) {
 502         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 503             width-- != 0 &&
 504             !iswspace(wi))
 505           nread++;
 506         if (wi != WEOF)
 507           ungetwc(wi, fp);
 508       } else if (flags & LONG) {
 509         p0 = p = va_arg(ap, wchar_t *);
 510         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 511             width-- != 0 &&
 512             !iswspace(wi)) {
 513           *p++ = (wchar_t)wi;
 514           nread++;
 515         }
 516         if (wi != WEOF)
 517           ungetwc(wi, fp);
 518         *p = '\0';
 519         nassigned++;
 520       } else {
 521         if (!(flags & SUPPRESS))
 522           mbp = va_arg(ap, char *);
 523         mbs = initial;
 524         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 525             width != 0 &&
 526             !iswspace(wi)) {
 527           if (width >= MB_CUR_MAX &&
 528               !(flags & SUPPRESS)) {
 529             nconv = wcrtomb(mbp, wi, &mbs);
 530             if (nconv == (size_t)-1)
 531               goto input_failure;
 532           } else {
 533             nconv = wcrtomb(mbbuf, wi,
 534                 &mbs);
 535             if (nconv == (size_t)-1)
 536               goto input_failure;
 537             if (nconv > width)
 538               break;
 539             if (!(flags & SUPPRESS))
 540               memcpy(mbp, mbbuf,
 541                   nconv);
 542           }
 543           if (!(flags & SUPPRESS))
 544             mbp += nconv;
 545           width -= nconv;
 546           nread++;
 547         }
 548         if (wi != WEOF)
 549           ungetwc(wi, fp);
 550         if (!(flags & SUPPRESS)) {
 551           *mbp = 0;
 552           nassigned++;
 553         }
 554       }
 555       nconversions++;
 556       continue;
 557
 558     case CT_INT:
 559       /* scan an integer as if by the conversion function */
 560       if (width == 0 || width > sizeof(buf) /
 561           sizeof(*buf) - 1)
 562         width = sizeof(buf) / sizeof(*buf) - 1;
 563       flags |= SIGNOK | NDIGITS | NZDIGITS;
 564       for (p = buf; width; width--) {
 565         c = __fgetwc_unlock(fp);
 566         /*
 567          * Switch on the character; `goto ok'
 568          * if we accept it as a part of number.
 569          */
 570         switch (c) {
 571
 572         /*
 573          * The digit 0 is always legal, but is
 574          * special.  For %i conversions, if no
 575          * digits (zero or nonzero) have been
 576          * scanned (only signs), we will have
 577          * base==0.  In that case, we should set
 578          * it to 8 and enable 0x prefixing.
 579          * Also, if we have not scanned zero digits
 580          * before this, do not turn off prefixing
 581          * (someone else will turn it off if we
 582          * have scanned any nonzero digits).
 583          */
 584         case '0':
 585           if (base == 0) {
 586             base = 8;
 587             flags |= PFXOK;
 588           }
 589           if (flags & NZDIGITS)
 590               flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
 591           else
 592               flags &= ~(SIGNOK|PFXOK|NDIGITS);
 593           goto ok;
 594
 595         /* 1 through 7 always legal */
 596         case '1': case '2': case '3':
 597         case '4': case '5': case '6': case '7':
 598           base = basefix[base];
 599           flags &= ~(SIGNOK | PFXOK | NDIGITS);
 600           goto ok;
 601
 602         /* digits 8 and 9 ok iff decimal or hex */
 603         case '8': case '9':
 604           base = basefix[base];
 605           if (base <= 8)
 606             break;  /* not legal here */
 607           flags &= ~(SIGNOK | PFXOK | NDIGITS);
 608           goto ok;
 609
 610         /* letters ok iff hex */
 611         case 'A': case 'B': case 'C':
 612         case 'D': case 'E': case 'F':
 613         case 'a': case 'b': case 'c':
 614         case 'd': case 'e': case 'f':
 615           /* no need to fix base here */
 616           if (base <= 10)
 617             break;  /* not legal here */
 618           flags &= ~(SIGNOK | PFXOK | NDIGITS);
 619           goto ok;
 620
 621         /* sign ok only as first character */
 622         case '+': case '-':
 623           if (flags & SIGNOK) {
 624             flags &= ~SIGNOK;
 625             flags |= HAVESIGN;
 626             goto ok;
 627           }
 628           break;
 629
 630         /*
 631          * x ok iff flag still set & 2nd char (or
 632          * 3rd char if we have a sign).
 633          */
 634         case 'x': case 'X':
 635           if (flags & PFXOK && p ==
 636               buf + 1 + !!(flags & HAVESIGN)) {
 637             base = 16;  /* if %i */
 638             flags &= ~PFXOK;
 639             goto ok;
 640           }
 641           break;
 642         }
 643
 644         /*
 645          * If we got here, c is not a legal character
 646          * for a number.  Stop accumulating digits.
 647          */
 648         if (c != WEOF)
 649           ungetwc(c, fp);
 650         break;
 651     ok:
 652         /*
 653          * c is legal: store it and look at the next.
 654          */
 655         *p++ = (wchar_t)c;
 656       }
 657       /*
 658        * If we had only a sign, it is no good; push
 659        * back the sign.  If the number ends in `x',
 660        * it was [sign] '0' 'x', so push back the x
 661        * and treat it as [sign] '0'.
 662        */
 663       if (flags & NDIGITS) {
 664         if (p > buf)
 665           ungetwc(*--p, fp);
 666         goto match_failure;
 667       }
 668       c = p[-1];
 669       if (c == 'x' || c == 'X') {
 670         --p;
 671         ungetwc(c, fp);
 672       }
 673       if ((flags & SUPPRESS) == 0) {
 674         uintmax_t res;
 675
 676         *p = 0;
 677         if ((flags & UNSIGNED) == 0)
 678             res = wcstoimax(buf, NULL, base);
 679         else
 680             res = wcstoumax(buf, NULL, base);
 681
 682         if (flags & POINTER) {
 683           *va_arg(ap, void **) = (void *)res;
 684         }
 685         else if (flags & SHORTSHORT) {
 686           *va_arg(ap, char *) = (char)res;
 687         }
 688         else if (flags & SHORT) {
 689           *va_arg(ap, short *) = (short)res;
 690         }
 691         else if (flags & LONG) {
 692           *va_arg(ap, long *) = (long)res;
 693         }
 694         else if (flags & LONGLONG) {
 695           *va_arg(ap, INT64 *) = res;   // was quad_t
 696         }
 697         else if (flags & INTMAXT) {
 698           *va_arg(ap, intmax_t *) = res;
 699         }
 700         else if (flags & PTRDIFFT) {
 701           *va_arg(ap, ptrdiff_t *) = (ptrdiff_t)res;
 702         }
 703         else if (flags & SIZET) {
 704           *va_arg(ap, size_t *) = (size_t)res;
 705         }
 706         else {
 707           *va_arg(ap, int *) = (int)res;
 708         }
 709         nassigned++;
 710       }
 711       nread += p - buf;
 712       nconversions++;
 713       break;
 714
 715 #ifndef NO_FLOATING_POINT
 716     case CT_FLOAT:
 717       /* scan a floating point number as if by strtod */
 718       if (width == 0 || width > sizeof(buf) /
 719           sizeof(*buf) - 1)
 720         width = sizeof(buf) / sizeof(*buf) - 1;
 721       if ((width = parsefloat(fp, buf, buf + width)) == 0)
 722         goto match_failure;
 723       if ((flags & SUPPRESS) == 0) {
 724 #ifdef REAL_LONG_DOUBLE_SUPPORT
 725         if (flags & LONGDBL) {
 726           long double res = wcstold(buf, &p);
 727           *va_arg(ap, long double *) = res;
 728         } else
 729 #endif
 730         if (flags & (LONG | LONGDBL)) {
 731           double res = wcstod(buf, &p);
 732           *va_arg(ap, double *) = res;
 733         }
 734         else {
 735           float res = wcstof(buf, &p);
 736           *va_arg(ap, float *) = res;
 737         }
 738 #ifdef DEBUG
 739         if (p - buf != width)
 740           abort();
 741 #endif
 742         nassigned++;
 743       }
 744       nread += (int)width;
 745       nconversions++;
 746       break;
 747 #endif /* !NO_FLOATING_POINT */
 748     }
 749   }
 750 input_failure:
 751   return (nconversions != 0 ? nassigned : EOF);
 752 match_failure:
 753   return (nassigned);
 754 }
 755
 756 #ifndef NO_FLOATING_POINT
 757 static int
 758 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end)
 759 {
 760   wchar_t *commit, *p;
 761   int infnanpos = 0;
 762   enum {
 763     S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX,
 764     S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
 765   } state = S_START;
 766   wchar_t c;
 767   wchar_t decpt = (wchar_t)(unsigned char)*localeconv()->decimal_point;
 768   int gotmantdig = 0, ishex = 0;
 769
 770   /*
 771    * We set commit = p whenever the string we have read so far
 772    * constitutes a valid representation of a floating point
 773    * number by itself.  At some point, the parse will complete
 774    * or fail, and we will ungetc() back to the last commit point.
 775    * To ensure that the file offset gets updated properly, it is
 776    * always necessary to read at least one character that doesn't
 777    * match; thus, we can't short-circuit "infinity" or "nan(...)".
 778    */
 779   commit = buf - 1;
 780   c = (wchar_t)WEOF;
 781   for (p = buf; p < end; ) {
 782     if ((wint_t)(c = __fgetwc_unlock(fp)) == WEOF)
 783       break;
 784 reswitch:
 785     switch (state) {
 786     case S_START:
 787       state = S_GOTSIGN;
 788       if (c == '-' || c == '+')
 789         break;
 790       else
 791         goto reswitch;
 792     case S_GOTSIGN:
 793       switch (c) {
 794       case '0':
 795         state = S_MAYBEHEX;
 796         commit = p;
 797         break;
 798       case 'I':
 799       case 'i':
 800         state = S_INF;
 801         break;
 802       case 'N':
 803       case 'n':
 804         state = S_NAN;
 805         break;
 806       default:
 807         state = S_DIGITS;
 808         goto reswitch;
 809       }
 810       break;
 811     case S_INF:
 812       if (infnanpos > 6 ||
 813           (c != "nfinity"[infnanpos] &&
 814            c != "NFINITY"[infnanpos]))
 815         goto parsedone;
 816       if (infnanpos == 1 || infnanpos == 6)
 817         commit = p; /* inf or infinity */
 818       infnanpos++;
 819       break;
 820     case S_NAN:
 821       switch (infnanpos) {
 822       case -1:  /* XXX kludge to deal with nan(...) */
 823         goto parsedone;
 824       case 0:
 825         if (c != 'A' && c != 'a')
 826           goto parsedone;
 827         break;
 828       case 1:
 829         if (c != 'N' && c != 'n')
 830           goto parsedone;
 831         else
 832           commit = p;
 833         break;
 834       case 2:
 835         if (c != '(')
 836           goto parsedone;
 837         break;
 838       default:
 839         if (c == ')') {
 840           commit = p;
 841           infnanpos = -2;
 842         } else if (!iswalnum(c) && c != '_')
 843           goto parsedone;
 844         break;
 845       }
 846       infnanpos++;
 847       break;
 848     case S_MAYBEHEX:
 849       state = S_DIGITS;
 850       if (c == 'X' || c == 'x') {
 851         ishex = 1;
 852         break;
 853       } else {  /* we saw a '0', but no 'x' */
 854         gotmantdig = 1;
 855         goto reswitch;
 856       }
 857     case S_DIGITS:
 858       if ((ishex && iswxdigit(c)) || iswdigit(c))
 859         gotmantdig = 1;
 860       else {
 861         state = S_FRAC;
 862         if (c != decpt)
 863           goto reswitch;
 864       }
 865       if (gotmantdig)
 866         commit = p;
 867       break;
 868     case S_FRAC:
 869       if (((c == 'E' || c == 'e') && !ishex) ||
 870           ((c == 'P' || c == 'p') && ishex)) {
 871         if (!gotmantdig)
 872           goto parsedone;
 873         else
 874           state = S_EXP;
 875       } else if ((ishex && iswxdigit(c)) || iswdigit(c)) {
 876         commit = p;
 877         gotmantdig = 1;
 878       } else
 879         goto parsedone;
 880       break;
 881     case S_EXP:
 882       state = S_EXPDIGITS;
 883       if (c == '-' || c == '+')
 884         break;
 885       else
 886         goto reswitch;
 887     case S_EXPDIGITS:
 888       if (iswdigit(c))
 889         commit = p;
 890       else
 891         goto parsedone;
 892       break;
 893     default:
 894       abort();
 895     }
 896     *p++ = c;
 897     c = (wchar_t)WEOF;
 898   }
 899
 900 parsedone:
 901   if ((wint_t)c != WEOF)
 902     ungetwc(c, fp);
 903   while (commit < --p)
 904     ungetwc(*p, fp);
 905   *++commit = '\0';
 906   return (commit - buf);
 907 }
 908 #endif