StdLib/LibC/Stdio/vfwscanf.c

   1 /** @file
   2   valist worker function for the wide-character fscanf.
   3
   4   Copyright (c) 2010 - 2014, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials are licensed and made available under
   6   the terms and conditions of the BSD License that accompanies this distribution.
   7   The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13  * Copyright (c) 1990, 1993
  14  *  The Regents of the University of California.  All rights reserved.
  15  *
  16  * This code is derived from software contributed to Berkeley by
  17  * Chris Torek.
  18  *
  19  * Redistribution and use in source and binary forms, with or without
  20  * modification, are permitted provided that the following conditions
  21  * are met:
  22  * 1. Redistributions of source code must retain the above copyright
  23  *    notice, this list of conditions and the following disclaimer.
  24  * 2. Redistributions in binary form must reproduce the above copyright
  25  *    notice, this list of conditions and the following disclaimer in the
  26  *    documentation and/or other materials provided with the distribution.
  27  * 3. All advertising materials mentioning features or use of this software
  28  *    must display the following acknowledgement:
  29  *  This product includes software developed by the University of
  30  *  California, Berkeley and its contributors.
  31  * 4. Neither the name of the University nor the names of its contributors
  32  *    may be used to endorse or promote products derived from this software
  33  *    without specific prior written permission.
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  36  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  38  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  39  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  40  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  41  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  42  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  43  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  44  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  45  * SUCH DAMAGE.
  46
  47   FreeBSD: src/lib/libc/stdio/vfwscanf.c,v 1.12 2004/05/02 20:13:29 obrien Exp
  48   NetBSD: vfwscanf.c,v 1.2 2005/06/12 05:48:41 lukem Exp
  49  */
  50 #include  <LibConfig.h>
  51 #include  <sys/EfiCdefs.h>
  52
  53 #include  "namespace.h"
  54 #include  <ctype.h>
  55 #include  <inttypes.h>
  56 #include  <stdio.h>
  57 #include  <stdlib.h>
  58 #include  <stddef.h>
  59 #include  <stdarg.h>
  60 #include  <string.h>
  61 #include  <limits.h>
  62 #include  <wchar.h>
  63 #include  <wctype.h>
  64
  65 #include  "reentrant.h"
  66 #include  "local.h"
  67
  68 #ifndef NO_FLOATING_POINT
  69 #include  <locale.h>
  70 #endif
  71
  72 #if defined(_MSC_VER)           /* Handle Microsoft VC++ compiler specifics. */
  73   #pragma warning ( disable : 4244 )  // Allow wint_t to wchar_t conversions
  74   #pragma warning ( disable : 4305 )  // Allow truncation from UINT64 to void*
  75   #pragma warning ( disable : 4701 )  // Disable false warning for local variable p near line 375
  76 #endif
  77
  78
  79 #define BUF   513 /* Maximum length of numeric string. */
  80
  81 /*
  82  * Flags used during conversion.
  83  */
  84 #define LONG        0x01    /* l: long or double */
  85 #define LONGDBL     0x02    /* L: long double */
  86 #define SHORT       0x04    /* h: short */
  87 #define SUPPRESS    0x08    /* *: suppress assignment */
  88 #define POINTER     0x10    /* p: void * (as hex) */
  89 #define NOSKIP      0x20    /* [ or c: do not skip blanks */
  90 #define LONGLONG    0x400   /* ll: quad_t (+ deprecated q: quad) */
  91 #define INTMAXT     0x800   /* j: intmax_t */
  92 #define PTRDIFFT    0x1000  /* t: ptrdiff_t */
  93 #define SIZET       0x2000  /* z: size_t */
  94 #define SHORTSHORT  0x4000  /* hh: char */
  95 #define UNSIGNED    0x8000  /* %[oupxX] conversions */
  96
  97 /*
  98  * The following are used in integral conversions only:
  99  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
 100  */
 101 #define SIGNOK    0x40    /* +/- is (still) legal */
 102 #define NDIGITS   0x80    /* no digits detected */
 103 #define PFXOK     0x100   /* 0x prefix is (still) legal */
 104 #define NZDIGITS  0x200   /* no zero digits detected */
 105 #define HAVESIGN  0x10000 /* sign detected */
 106
 107 /*
 108  * Conversion types.
 109  */
 110 #define CT_CHAR   0 /* %c conversion */
 111 #define CT_CCL    1 /* %[...] conversion */
 112 #define CT_STRING 2 /* %s conversion */
 113 #define CT_INT    3 /* %[dioupxX] conversion */
 114 #define CT_FLOAT  4 /* %[efgEFG] conversion */
 115
 116 static int parsefloat(FILE *, wchar_t *, wchar_t *);
 117
 118 #define INCCL(_c) \
 119   (cclcompl ? (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) == NULL) : \
 120   (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) != NULL))
 121
 122 /*
 123  * MT-safe version.
 124  */
 125 int
 126 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 127 {
 128   int ret;
 129
 130   FLOCKFILE(fp);
 131   _SET_ORIENTATION(fp, 1);
 132   ret = __vfwscanf_unlocked(fp, fmt, ap);
 133   FUNLOCKFILE(fp);
 134   return (ret);
 135 }
 136
 137 /*
 138  * Non-MT-safe version.
 139  */
 140 int
 141 __vfwscanf_unlocked(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 142 {
 143   wint_t                  c;                            /* character from format, or conversion */
 144   size_t                  width;                        /* field width, or 0 */
 145   wchar_t                *p                   = NULL;   /* points into all kinds of strings */
 146   int                     n;                            /* handy integer */
 147   int                     flags;                        /* flags as defined above */
 148   wchar_t                *p0;                           /* saves original value of p when necessary */
 149   int                     nassigned;                    /* number of fields assigned */
 150   int                     nconversions;                 /* number of conversions */
 151   int                     nread;                        /* number of characters consumed from fp */
 152   int                     base;                         /* base argument to conversion function */
 153   wchar_t                 buf[BUF];                     /* buffer for numeric conversions */
 154   const wchar_t          *ccls;                         /* character class start */
 155   const wchar_t          *ccle;                         /* character class end */
 156   int                     cclcompl;                     /* ccl is complemented? */
 157   wint_t                  wi;                           /* handy wint_t */
 158   char                   *mbp;                          /* multibyte string pointer for %c %s %[ */
 159   size_t                  nconv;                        /* number of bytes in mb. conversion */
 160   char                    mbbuf[MB_LEN_MAX];            /* temporary mb. character buffer */
 161   mbstate_t               mbs;
 162
 163   static const mbstate_t  initial             = { 0 };
 164   /* `basefix' is used to avoid `if' tests in the integer scanner */
 165   static short            basefix[17] =
 166     { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
 167
 168   nassigned     = 0;
 169   nconversions  = 0;
 170   nread         = 0;
 171   ccls          = NULL;
 172   ccle          = NULL;
 173   base          = 0;
 174   cclcompl      = 0;
 175   mbp           = NULL;
 176
 177   for (;;) {
 178     c = *fmt++;
 179     if (c == 0)
 180       return (nassigned);
 181     if (iswspace(c)) {
 182       while ((c = __fgetwc_unlock(fp)) != WEOF &&
 183           iswspace(c))
 184         ;
 185       if (c != WEOF)
 186         ungetwc(c, fp);
 187       continue;
 188     }
 189     if (c != '%')
 190       goto literal;
 191     width = 0;
 192     flags = 0;
 193     /*
 194      * switch on the format.  continue if done;
 195      * break once format type is derived.
 196      */
 197 again:    c = *fmt++;
 198     switch (c) {
 199     case '%':
 200 literal:
 201       if ((wi = __fgetwc_unlock(fp)) == WEOF)
 202         goto input_failure;
 203       if (wi != c) {
 204         ungetwc(wi, fp);
 205         goto match_failure;
 206       }
 207       nread++;
 208       continue;
 209
 210     case '*':
 211       flags |= SUPPRESS;
 212       goto again;
 213     case 'j':
 214       flags |= INTMAXT;
 215       goto again;
 216     case 'l':
 217       if (flags & LONG) {
 218         flags &= ~LONG;
 219         flags |= LONGLONG;
 220       } else
 221         flags |= LONG;
 222       goto again;
 223     case 'q':
 224       flags |= LONGLONG;  /* not quite */
 225       goto again;
 226     case 't':
 227       flags |= PTRDIFFT;
 228       goto again;
 229     case 'z':
 230       flags |= SIZET;
 231       goto again;
 232     case 'L':
 233       flags |= LONGDBL;
 234       goto again;
 235     case 'h':
 236       if (flags & SHORT) {
 237         flags &= ~SHORT;
 238         flags |= SHORTSHORT;
 239       } else
 240         flags |= SHORT;
 241       goto again;
 242
 243     case '0': case '1': case '2': case '3': case '4':
 244     case '5': case '6': case '7': case '8': case '9':
 245       width = width * 10 + c - '0';
 246       goto again;
 247
 248     /*
 249      * Conversions.
 250      */
 251     case 'd':
 252       c = CT_INT;
 253       base = 10;
 254       break;
 255
 256     case 'i':
 257       c = CT_INT;
 258       base = 0;
 259       break;
 260
 261     case 'o':
 262       c = CT_INT;
 263       flags |= UNSIGNED;
 264       base = 8;
 265       break;
 266
 267     case 'u':
 268       c = CT_INT;
 269       flags |= UNSIGNED;
 270       base = 10;
 271       break;
 272
 273     case 'X':
 274     case 'x':
 275       flags |= PFXOK; /* enable 0x prefixing */
 276       c = CT_INT;
 277       flags |= UNSIGNED;
 278       base = 16;
 279       break;
 280
 281 #ifndef NO_FLOATING_POINT
 282     //case 'A':
 283     case 'E': case 'F': case 'G':
 284     //case 'a':
 285     case 'e': case 'f': case 'g':
 286       c = CT_FLOAT;
 287       break;
 288 #endif
 289
 290     case 'S':
 291       flags |= LONG;
 292       /* FALLTHROUGH */
 293     case 's':
 294       c = CT_STRING;
 295       break;
 296
 297     case '[':
 298       ccls = fmt;
 299       if (*fmt == '^') {
 300         cclcompl = 1;
 301         fmt++;
 302       } else
 303         cclcompl = 0;
 304       if (*fmt == ']')
 305         fmt++;
 306       while (*fmt != '\0' && *fmt != ']')
 307         fmt++;
 308       ccle = fmt;
 309       fmt++;
 310       flags |= NOSKIP;
 311       c = CT_CCL;
 312       break;
 313
 314     case 'C':
 315       flags |= LONG;
 316       /* FALLTHROUGH */
 317     case 'c':
 318       flags |= NOSKIP;
 319       c = CT_CHAR;
 320       break;
 321
 322     case 'p': /* pointer format is like hex */
 323       flags |= POINTER | PFXOK;
 324       c = CT_INT;   /* assumes sizeof(uintmax_t) */
 325       flags |= UNSIGNED;  /*      >= sizeof(uintptr_t) */
 326       base = 16;
 327       break;
 328
 329     case 'n':
 330       nconversions++;
 331       if (flags & SUPPRESS) /* ??? */
 332         continue;
 333       if (flags & SHORTSHORT)
 334         *va_arg(ap, char *) = (char)nread;
 335       else if (flags & SHORT)
 336         *va_arg(ap, short *) = (short)nread;
 337       else if (flags & LONG)
 338         *va_arg(ap, long *) = (long)nread;
 339       else if (flags & LONGLONG)
 340         *va_arg(ap, INT64 *) = (INT64)nread;    // was quad_t
 341       else if (flags & INTMAXT)
 342         *va_arg(ap, intmax_t *) = (intmax_t)nread;
 343       else if (flags & SIZET)
 344         *va_arg(ap, size_t *) = (size_t)nread;
 345       else if (flags & PTRDIFFT)
 346         *va_arg(ap, ptrdiff_t *) = (ptrdiff_t)nread;
 347       else
 348         *va_arg(ap, int *) = nread;
 349       continue;
 350
 351     default:
 352       goto match_failure;
 353
 354     /*
 355      * Disgusting backwards compatibility hack. XXX
 356      */
 357     case '\0':  /* compat */
 358       return (EOF);
 359     }
 360
 361     /*
 362      * Consume leading white space, except for formats
 363      * that suppress this.
 364      */
 365     if ((flags & NOSKIP) == 0) {
 366       while ((wi = __fgetwc_unlock(fp)) != WEOF && iswspace(wi))
 367         nread++;
 368       if (wi == WEOF)
 369         goto input_failure;
 370       ungetwc(wi, fp);
 371     }
 372
 373     /*
 374      * Do the conversion.
 375      */
 376     switch (c) {
 377
 378     case CT_CHAR:
 379       /* scan arbitrary characters (sets NOSKIP) */
 380       if (width == 0)
 381         width = 1;
 382       if (flags & LONG) {
 383         if (!(flags & SUPPRESS))
 384           p = va_arg(ap, wchar_t *);
 385         n = 0;
 386         while (width-- != 0 &&
 387             (wi = __fgetwc_unlock(fp)) != WEOF) {
 388           if (!(flags & SUPPRESS))
 389             *p++ = (wchar_t)wi;
 390           n++;
 391         }
 392         if (n == 0)
 393           goto input_failure;
 394         nread += n;
 395         if (!(flags & SUPPRESS))
 396           nassigned++;
 397       } else {
 398         if (!(flags & SUPPRESS))
 399           mbp = va_arg(ap, char *);
 400         n = 0;
 401         mbs = initial;
 402         while (width != 0 &&
 403             (wi = __fgetwc_unlock(fp)) != WEOF) {
 404           if (width >= MB_CUR_MAX &&
 405               !(flags & SUPPRESS)) {
 406             nconv = wcrtomb(mbp, (wchar_t)wi, &mbs);
 407             if (nconv == (size_t)-1)
 408               goto input_failure;
 409           } else {
 410             nconv = wcrtomb(mbbuf, (wchar_t)wi,
 411                 &mbs);
 412             if (nconv == (size_t)-1)
 413               goto input_failure;
 414             if (nconv > width) {
 415               ungetwc(wi, fp);
 416               break;
 417             }
 418             if (!(flags & SUPPRESS))
 419               memcpy(mbp, mbbuf,
 420                   nconv);
 421           }
 422           if (!(flags & SUPPRESS))
 423             mbp += nconv;
 424           width -= nconv;
 425           n++;
 426         }
 427         if (n == 0)
 428           goto input_failure;
 429         nread += n;
 430         if (!(flags & SUPPRESS))
 431           nassigned++;
 432       }
 433       nconversions++;
 434       break;
 435
 436     case CT_CCL:
 437       /* scan a (nonempty) character class (sets NOSKIP) */
 438       if (width == 0)
 439         width = (size_t)~0; /* `infinity' */
 440       /* take only those things in the class */
 441       if ((flags & SUPPRESS) && (flags & LONG)) {
 442         n = 0;
 443         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 444             width-- != 0 && INCCL(wi))
 445           n++;
 446         if (wi != WEOF)
 447           ungetwc(wi, fp);
 448         if (n == 0)
 449           goto match_failure;
 450       } else if (flags & LONG) {
 451         p0 = p = va_arg(ap, wchar_t *);
 452         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 453             width-- != 0 && INCCL(wi))
 454           *p++ = (wchar_t)wi;
 455         if (wi != WEOF)
 456           ungetwc(wi, fp);
 457         n = p - p0;
 458         if (n == 0)
 459           goto match_failure;
 460         *p = 0;
 461         nassigned++;
 462       } else {
 463         if (!(flags & SUPPRESS))
 464           mbp = va_arg(ap, char *);
 465         n = 0;
 466         mbs = initial;
 467         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 468             width != 0 && INCCL(wi)) {
 469           if (width >= MB_CUR_MAX &&
 470              !(flags & SUPPRESS)) {
 471             nconv = wcrtomb(mbp, wi, &mbs);
 472             if (nconv == (size_t)-1)
 473               goto input_failure;
 474           } else {
 475             nconv = wcrtomb(mbbuf, wi,
 476                 &mbs);
 477             if (nconv == (size_t)-1)
 478               goto input_failure;
 479             if (nconv > width)
 480               break;
 481             if (!(flags & SUPPRESS))
 482               memcpy(mbp, mbbuf,
 483                   nconv);
 484           }
 485           if (!(flags & SUPPRESS))
 486             mbp += nconv;
 487           width -= nconv;
 488           n++;
 489         }
 490         if (wi != WEOF)
 491           ungetwc(wi, fp);
 492         if (!(flags & SUPPRESS)) {
 493           *mbp = 0;
 494           nassigned++;
 495         }
 496       }
 497       nread += n;
 498       nconversions++;
 499       break;
 500
 501     case CT_STRING:
 502       /* like CCL, but zero-length string OK, & no NOSKIP */
 503       if (width == 0)
 504         width = (size_t)~0;
 505       if ((flags & SUPPRESS) && (flags & LONG)) {
 506         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 507             width-- != 0 &&
 508             !iswspace(wi))
 509           nread++;
 510         if (wi != WEOF)
 511           ungetwc(wi, fp);
 512       } else if (flags & LONG) {
 513         p0 = p = va_arg(ap, wchar_t *);
 514         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 515             width-- != 0 &&
 516             !iswspace(wi)) {
 517           *p++ = (wchar_t)wi;
 518           nread++;
 519         }
 520         if (wi != WEOF)
 521           ungetwc(wi, fp);
 522         *p = '\0';
 523         nassigned++;
 524       } else {
 525         if (!(flags & SUPPRESS))
 526           mbp = va_arg(ap, char *);
 527         mbs = initial;
 528         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 529             width != 0 &&
 530             !iswspace(wi)) {
 531           if (width >= MB_CUR_MAX &&
 532               !(flags & SUPPRESS)) {
 533             nconv = wcrtomb(mbp, wi, &mbs);
 534             if (nconv == (size_t)-1)
 535               goto input_failure;
 536           } else {
 537             nconv = wcrtomb(mbbuf, wi,
 538                 &mbs);
 539             if (nconv == (size_t)-1)
 540               goto input_failure;
 541             if (nconv > width)
 542               break;
 543             if (!(flags & SUPPRESS))
 544               memcpy(mbp, mbbuf,
 545                   nconv);
 546           }
 547           if (!(flags & SUPPRESS))
 548             mbp += nconv;
 549           width -= nconv;
 550           nread++;
 551         }
 552         if (wi != WEOF)
 553           ungetwc(wi, fp);
 554         if (!(flags & SUPPRESS)) {
 555           *mbp = 0;
 556           nassigned++;
 557         }
 558       }
 559       nconversions++;
 560       continue;
 561
 562     case CT_INT:
 563       /* scan an integer as if by the conversion function */
 564       if (width == 0 || width > sizeof(buf) /
 565           sizeof(*buf) - 1)
 566         width = sizeof(buf) / sizeof(*buf) - 1;
 567       flags |= SIGNOK | NDIGITS | NZDIGITS;
 568       for (p = buf; width; width--) {
 569         c = __fgetwc_unlock(fp);
 570         /*
 571          * Switch on the character; `goto ok'
 572          * if we accept it as a part of number.
 573          */
 574         switch (c) {
 575
 576         /*
 577          * The digit 0 is always legal, but is
 578          * special.  For %i conversions, if no
 579          * digits (zero or nonzero) have been
 580          * scanned (only signs), we will have
 581          * base==0.  In that case, we should set
 582          * it to 8 and enable 0x prefixing.
 583          * Also, if we have not scanned zero digits
 584          * before this, do not turn off prefixing
 585          * (someone else will turn it off if we
 586          * have scanned any nonzero digits).
 587          */
 588         case '0':
 589           if (base == 0) {
 590             base = 8;
 591             flags |= PFXOK;
 592           }
 593           if (flags & NZDIGITS)
 594               flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
 595           else
 596               flags &= ~(SIGNOK|PFXOK|NDIGITS);
 597           goto ok;
 598
 599         /* 1 through 7 always legal */
 600         case '1': case '2': case '3':
 601         case '4': case '5': case '6': case '7':
 602           base = basefix[base];
 603           flags &= ~(SIGNOK | PFXOK | NDIGITS);
 604           goto ok;
 605
 606         /* digits 8 and 9 ok iff decimal or hex */
 607         case '8': case '9':
 608           base = basefix[base];
 609           if (base <= 8)
 610             break;  /* not legal here */
 611           flags &= ~(SIGNOK | PFXOK | NDIGITS);
 612           goto ok;
 613
 614         /* letters ok iff hex */
 615         case 'A': case 'B': case 'C':
 616         case 'D': case 'E': case 'F':
 617         case 'a': case 'b': case 'c':
 618         case 'd': case 'e': case 'f':
 619           /* no need to fix base here */
 620           if (base <= 10)
 621             break;  /* not legal here */
 622           flags &= ~(SIGNOK | PFXOK | NDIGITS);
 623           goto ok;
 624
 625         /* sign ok only as first character */
 626         case '+': case '-':
 627           if (flags & SIGNOK) {
 628             flags &= ~SIGNOK;
 629             flags |= HAVESIGN;
 630             goto ok;
 631           }
 632           break;
 633
 634         /*
 635          * x ok iff flag still set & 2nd char (or
 636          * 3rd char if we have a sign).
 637          */
 638         case 'x': case 'X':
 639           if (flags & PFXOK && p ==
 640               buf + 1 + !!(flags & HAVESIGN)) {
 641             base = 16;  /* if %i */
 642             flags &= ~PFXOK;
 643             goto ok;
 644           }
 645           break;
 646         }
 647
 648         /*
 649          * If we got here, c is not a legal character
 650          * for a number.  Stop accumulating digits.
 651          */
 652         if (c != WEOF)
 653           ungetwc(c, fp);
 654         break;
 655     ok:
 656         /*
 657          * c is legal: store it and look at the next.
 658          */
 659         *p++ = (wchar_t)c;
 660       }
 661       /*
 662        * If we had only a sign, it is no good; push
 663        * back the sign.  If the number ends in `x',
 664        * it was [sign] '0' 'x', so push back the x
 665        * and treat it as [sign] '0'.
 666        */
 667       if (flags & NDIGITS) {
 668         if (p > buf)
 669           ungetwc(*--p, fp);
 670         goto match_failure;
 671       }
 672       c = p[-1];
 673       if (c == 'x' || c == 'X') {
 674         --p;
 675         ungetwc(c, fp);
 676       }
 677       if ((flags & SUPPRESS) == 0) {
 678         uintmax_t res;
 679
 680         *p = 0;
 681         if ((flags & UNSIGNED) == 0)
 682             res = wcstoimax(buf, NULL, base);
 683         else
 684             res = wcstoumax(buf, NULL, base);
 685
 686         if (flags & POINTER) {
 687           *va_arg(ap, void **) = (void *)res;
 688         }
 689         else if (flags & SHORTSHORT) {
 690           *va_arg(ap, char *) = (char)res;
 691         }
 692         else if (flags & SHORT) {
 693           *va_arg(ap, short *) = (short)res;
 694         }
 695         else if (flags & LONG) {
 696           *va_arg(ap, long *) = (long)res;
 697         }
 698         else if (flags & LONGLONG) {
 699           *va_arg(ap, INT64 *) = res;   // was quad_t
 700         }
 701         else if (flags & INTMAXT) {
 702           *va_arg(ap, intmax_t *) = res;
 703         }
 704         else if (flags & PTRDIFFT) {
 705           *va_arg(ap, ptrdiff_t *) = (ptrdiff_t)res;
 706         }
 707         else if (flags & SIZET) {
 708           *va_arg(ap, size_t *) = (size_t)res;
 709         }
 710         else {
 711           *va_arg(ap, int *) = (int)res;
 712         }
 713         nassigned++;
 714       }
 715       nread += p - buf;
 716       nconversions++;
 717       break;
 718
 719 #ifndef NO_FLOATING_POINT
 720     case CT_FLOAT:
 721       /* scan a floating point number as if by strtod */
 722       if (width == 0 || width > sizeof(buf) /
 723           sizeof(*buf) - 1)
 724         width = sizeof(buf) / sizeof(*buf) - 1;
 725       if ((width = parsefloat(fp, buf, buf + width)) == 0)
 726         goto match_failure;
 727       if ((flags & SUPPRESS) == 0) {
 728 #ifdef REAL_LONG_DOUBLE_SUPPORT
 729         if (flags & LONGDBL) {
 730           long double res = wcstold(buf, &p);
 731           *va_arg(ap, long double *) = res;
 732         } else
 733 #endif
 734         if (flags & (LONG | LONGDBL)) {
 735           double res = wcstod(buf, &p);
 736           *va_arg(ap, double *) = res;
 737         }
 738         else {
 739           float res = wcstof(buf, &p);
 740           *va_arg(ap, float *) = res;
 741         }
 742 #ifdef DEBUG
 743         if (p - buf != width)
 744           abort();
 745 #endif
 746         nassigned++;
 747       }
 748       nread += (int)width;
 749       nconversions++;
 750       break;
 751 #endif /* !NO_FLOATING_POINT */
 752     }
 753   }
 754 input_failure:
 755   return (nconversions != 0 ? nassigned : EOF);
 756 match_failure:
 757   return (nassigned);
 758 }
 759
 760 #ifndef NO_FLOATING_POINT
 761 static int
 762 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end)
 763 {
 764   wchar_t *commit, *p;
 765   int infnanpos = 0;
 766   enum {
 767     S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX,
 768     S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
 769   } state = S_START;
 770   wchar_t c;
 771   wchar_t decpt = (wchar_t)(unsigned char)*localeconv()->decimal_point;
 772   int gotmantdig = 0, ishex = 0;
 773
 774   /*
 775    * We set commit = p whenever the string we have read so far
 776    * constitutes a valid representation of a floating point
 777    * number by itself.  At some point, the parse will complete
 778    * or fail, and we will ungetc() back to the last commit point.
 779    * To ensure that the file offset gets updated properly, it is
 780    * always necessary to read at least one character that doesn't
 781    * match; thus, we can't short-circuit "infinity" or "nan(...)".
 782    */
 783   commit = buf - 1;
 784   c = (wchar_t)WEOF;
 785   for (p = buf; p < end; ) {
 786     if ((wint_t)(c = __fgetwc_unlock(fp)) == WEOF)
 787       break;
 788 reswitch:
 789     switch (state) {
 790     case S_START:
 791       state = S_GOTSIGN;
 792       if (c == '-' || c == '+')
 793         break;
 794       else
 795         goto reswitch;
 796     case S_GOTSIGN:
 797       switch (c) {
 798       case '0':
 799         state = S_MAYBEHEX;
 800         commit = p;
 801         break;
 802       case 'I':
 803       case 'i':
 804         state = S_INF;
 805         break;
 806       case 'N':
 807       case 'n':
 808         state = S_NAN;
 809         break;
 810       default:
 811         state = S_DIGITS;
 812         goto reswitch;
 813       }
 814       break;
 815     case S_INF:
 816       if (infnanpos > 6 ||
 817           (c != "nfinity"[infnanpos] &&
 818            c != "NFINITY"[infnanpos]))
 819         goto parsedone;
 820       if (infnanpos == 1 || infnanpos == 6)
 821         commit = p; /* inf or infinity */
 822       infnanpos++;
 823       break;
 824     case S_NAN:
 825       switch (infnanpos) {
 826       case -1:  /* XXX kludge to deal with nan(...) */
 827         goto parsedone;
 828       case 0:
 829         if (c != 'A' && c != 'a')
 830           goto parsedone;
 831         break;
 832       case 1:
 833         if (c != 'N' && c != 'n')
 834           goto parsedone;
 835         else
 836           commit = p;
 837         break;
 838       case 2:
 839         if (c != '(')
 840           goto parsedone;
 841         break;
 842       default:
 843         if (c == ')') {
 844           commit = p;
 845           infnanpos = -2;
 846         } else if (!iswalnum(c) && c != '_')
 847           goto parsedone;
 848         break;
 849       }
 850       infnanpos++;
 851       break;
 852     case S_MAYBEHEX:
 853       state = S_DIGITS;
 854       if (c == 'X' || c == 'x') {
 855         ishex = 1;
 856         break;
 857       } else {  /* we saw a '0', but no 'x' */
 858         gotmantdig = 1;
 859         goto reswitch;
 860       }
 861     case S_DIGITS:
 862       if ((ishex && iswxdigit(c)) || iswdigit(c))
 863         gotmantdig = 1;
 864       else {
 865         state = S_FRAC;
 866         if (c != decpt)
 867           goto reswitch;
 868       }
 869       if (gotmantdig)
 870         commit = p;
 871       break;
 872     case S_FRAC:
 873       if (((c == 'E' || c == 'e') && !ishex) ||
 874           ((c == 'P' || c == 'p') && ishex)) {
 875         if (!gotmantdig)
 876           goto parsedone;
 877         else
 878           state = S_EXP;
 879       } else if ((ishex && iswxdigit(c)) || iswdigit(c)) {
 880         commit = p;
 881         gotmantdig = 1;
 882       } else
 883         goto parsedone;
 884       break;
 885     case S_EXP:
 886       state = S_EXPDIGITS;
 887       if (c == '-' || c == '+')
 888         break;
 889       else
 890         goto reswitch;
 891     case S_EXPDIGITS:
 892       if (iswdigit(c))
 893         commit = p;
 894       else
 895         goto parsedone;
 896       break;
 897     default:
 898       abort();
 899     }
 900     *p++ = c;
 901     c = (wchar_t)WEOF;
 902   }
 903
 904 parsedone:
 905   if ((wint_t)c != WEOF)
 906     ungetwc(c, fp);
 907   while (commit < --p)
 908     ungetwc(*p, fp);
 909   *++commit = '\0';
 910   return (commit - buf);
 911 }
 912 #endif