stdio/FreeBSD/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  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #if 0
  39 #if defined(LIBC_SCCS) && !defined(lint)
  40 static char sccsid[] = "@(#)vfscanf.c   8.1 (Berkeley) 6/4/93";
  41 #endif /* LIBC_SCCS and not lint */
  42 __FBSDID("FreeBSD: src/lib/libc/stdio/vfscanf.c,v 1.32 2003/06/28 09:03:05 das Exp ");
  43 #endif
  44 __FBSDID("$FreeBSD: src/lib/libc/stdio/vfwscanf.c,v 1.6 2003/07/05 03:39:23 tjr Exp $");
  45
  46 #include "namespace.h"
  47 #include <ctype.h>
  48 #include <inttypes.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <stddef.h>
  52 #include <stdarg.h>
  53 #include <string.h>
  54 #include <wchar.h>
  55 #include <wctype.h>
  56 #include "un-namespace.h"
  57
  58 #include "libc_private.h"
  59 #include "local.h"
  60
  61 #define FLOATING_POINT
  62
  63 #ifdef FLOATING_POINT
  64 #include <locale.h>
  65 #endif
  66
  67 #define BUF             513     /* Maximum length of numeric string. */
  68
  69 /*
  70  * Flags used during conversion.
  71  */
  72 #define LONG            0x01    /* l: long or double */
  73 #define LONGDBL         0x02    /* L: long double */
  74 #define SHORT           0x04    /* h: short */
  75 #define SUPPRESS        0x08    /* *: suppress assignment */
  76 #define POINTER         0x10    /* p: void * (as hex) */
  77 #define NOSKIP          0x20    /* [ or c: do not skip blanks */
  78 #define LONGLONG        0x400   /* ll: long long (+ deprecated q: quad) */
  79 #define INTMAXT         0x800   /* j: intmax_t */
  80 #define PTRDIFFT        0x1000  /* t: ptrdiff_t */
  81 #define SIZET           0x2000  /* z: size_t */
  82 #define SHORTSHORT      0x4000  /* hh: char */
  83 #define UNSIGNED        0x8000  /* %[oupxX] conversions */
  84
  85 /*
  86  * The following are used in integral conversions only:
  87  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
  88  */
  89 #define SIGNOK          0x40    /* +/- is (still) legal */
  90 #define NDIGITS         0x80    /* no digits detected */
  91 #define PFXOK           0x100   /* 0x prefix is (still) legal */
  92 #define NZDIGITS        0x200   /* no zero digits detected */
  93
  94 /*
  95  * Conversion types.
  96  */
  97 #define CT_CHAR         0       /* %c conversion */
  98 #define CT_CCL          1       /* %[...] conversion */
  99 #define CT_STRING       2       /* %s conversion */
 100 #define CT_INT          3       /* %[dioupxX] conversion */
 101 #define CT_FLOAT        4       /* %[efgEFG] conversion */
 102
 103 static int parsefloat(FILE *, wchar_t *, wchar_t *);
 104
 105 extern int __scanfdebug;
 106
 107 #define INCCL(_c)       \
 108         (cclcompl ? (wmemchr(ccls, (_c), ccle - ccls) == NULL) : \
 109         (wmemchr(ccls, (_c), ccle - ccls) != NULL))
 110
 111 /*
 112  * MT-safe version.
 113  */
 114 int
 115 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 116 {
 117         int ret;
 118
 119         FLOCKFILE(fp);
 120         ORIENT(fp, 1);
 121         ret = __vfwscanf(fp, fmt, ap);
 122         FUNLOCKFILE(fp);
 123         return (ret);
 124 }
 125
 126 /*
 127  * Non-MT-safe version.
 128  */
 129 int
 130 __vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 131 {
 132         wint_t c;               /* character from format, or conversion */
 133         size_t width;           /* field width, or 0 */
 134         wchar_t *p;             /* points into all kinds of strings */
 135         int n;                  /* handy integer */
 136         int flags;              /* flags as defined above */
 137         wchar_t *p0;            /* saves original value of p when necessary */
 138         int nassigned;          /* number of fields assigned */
 139         int nconversions;       /* number of conversions */
 140         int nread;              /* number of characters consumed from fp */
 141         int base;               /* base argument to conversion function */
 142         wchar_t buf[BUF];       /* buffer for numeric conversions */
 143         const wchar_t *ccls;    /* character class start */
 144         const wchar_t *ccle;    /* character class end */
 145         int cclcompl;           /* ccl is complemented? */
 146         wint_t wi;              /* handy wint_t */
 147         char *mbp;              /* multibyte string pointer for %c %s %[ */
 148         size_t nconv;           /* number of bytes in mb. conversion */
 149         mbstate_t mbs;          /* multibyte state */
 150         char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */
 151
 152         /* `basefix' is used to avoid `if' tests in the integer scanner */
 153         static short basefix[17] =
 154                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
 155
 156         nassigned = 0;
 157         nconversions = 0;
 158         nread = 0;
 159         ccls = ccle = NULL;
 160         for (;;) {
 161                 c = *fmt++;
 162                 if (c == 0)
 163                         return (nassigned);
 164                 if (iswspace(c)) {
 165                         while ((c = __fgetwc(fp)) != WEOF &&
 166                             iswspace(c))
 167                                 ;
 168                         if (c != WEOF)
 169                                 __ungetwc(c, fp);
 170                         continue;
 171                 }
 172                 if (c != '%')
 173                         goto literal;
 174                 width = 0;
 175                 flags = 0;
 176                 /*
 177                  * switch on the format.  continue if done;
 178                  * break once format type is derived.
 179                  */
 180 again:          c = *fmt++;
 181                 switch (c) {
 182                 case '%':
 183 literal:
 184                         if ((wi = __fgetwc(fp)) == WEOF)
 185                                 goto input_failure;
 186                         if (wi != c) {
 187                                 __ungetwc(wi, fp);
 188                                 goto input_failure;
 189                         }
 190                         nread++;
 191                         continue;
 192
 193                 case '*':
 194                         flags |= SUPPRESS;
 195                         goto again;
 196                 case 'j':
 197                         flags |= INTMAXT;
 198                         goto again;
 199                 case 'l':
 200                         if (flags & LONG) {
 201                                 flags &= ~LONG;
 202                                 flags |= LONGLONG;
 203                         } else
 204                                 flags |= LONG;
 205                         goto again;
 206                 case 'q':
 207                         flags |= LONGLONG;      /* not quite */
 208                         goto again;
 209                 case 't':
 210                         flags |= PTRDIFFT;
 211                         goto again;
 212                 case 'z':
 213                         flags |= SIZET;
 214                         goto again;
 215                 case 'L':
 216                         flags |= LONGDBL;
 217                         goto again;
 218                 case 'h':
 219                         if (flags & SHORT) {
 220                                 flags &= ~SHORT;
 221                                 flags |= SHORTSHORT;
 222                         } else
 223                                 flags |= SHORT;
 224                         goto again;
 225
 226                 case '0': case '1': case '2': case '3': case '4':
 227                 case '5': case '6': case '7': case '8': case '9':
 228                         width = width * 10 + c - '0';
 229                         goto again;
 230
 231                 /*
 232                  * Conversions.
 233                  */
 234                 case 'd':
 235                         c = CT_INT;
 236                         base = 10;
 237                         break;
 238
 239                 case 'i':
 240                         c = CT_INT;
 241                         base = 0;
 242                         break;
 243
 244                 case 'o':
 245                         c = CT_INT;
 246                         flags |= UNSIGNED;
 247                         base = 8;
 248                         break;
 249
 250                 case 'u':
 251                         c = CT_INT;
 252                         flags |= UNSIGNED;
 253                         base = 10;
 254                         break;
 255
 256                 case 'X':
 257                 case 'x':
 258                         flags |= PFXOK; /* enable 0x prefixing */
 259                         c = CT_INT;
 260                         flags |= UNSIGNED;
 261                         base = 16;
 262                         break;
 263
 264 #ifdef FLOATING_POINT
 265                 case 'A': case 'E': case 'F': case 'G':
 266                 case 'a': case 'e': case 'f': case 'g':
 267                         c = CT_FLOAT;
 268                         break;
 269 #endif
 270
 271                 case 'S':
 272                         flags |= LONG;
 273                         /* FALLTHROUGH */
 274                 case 's':
 275                         c = CT_STRING;
 276                         break;
 277
 278                 case '[':
 279                         ccls = fmt;
 280                         if (*fmt == '^') {
 281                                 cclcompl = 1;
 282                                 fmt++;
 283                         } else
 284                                 cclcompl = 0;
 285                         if (*fmt == ']')
 286                                 fmt++;
 287                         while (*fmt != '\0' && *fmt != ']')
 288                                 fmt++;
 289                         ccle = fmt;
 290                         fmt++;
 291                         flags |= NOSKIP;
 292                         c = CT_CCL;
 293                         break;
 294
 295                 case 'C':
 296                         flags |= LONG;
 297                         /* FALLTHROUGH */
 298                 case 'c':
 299                         flags |= NOSKIP;
 300                         c = CT_CHAR;
 301                         break;
 302
 303                 case 'p':       /* pointer format is like hex */
 304                         flags |= POINTER | PFXOK;
 305                         c = CT_INT;             /* assumes sizeof(uintmax_t) */
 306                         flags |= UNSIGNED;      /*      >= sizeof(uintptr_t) */
 307                         base = 16;
 308                         break;
 309
 310                 case 'n':
 311                         nconversions++;
 312                         if (flags & SUPPRESS)   /* ??? */
 313                                 continue;
 314                         if (flags & SHORTSHORT)
 315                                 *va_arg(ap, char *) = nread;
 316                         else if (flags & SHORT)
 317                                 *va_arg(ap, short *) = nread;
 318                         else if (flags & LONG)
 319                                 *va_arg(ap, long *) = nread;
 320                         else if (flags & LONGLONG)
 321                                 *va_arg(ap, long long *) = nread;
 322                         else if (flags & INTMAXT)
 323                                 *va_arg(ap, intmax_t *) = nread;
 324                         else if (flags & SIZET)
 325                                 *va_arg(ap, size_t *) = nread;
 326                         else if (flags & PTRDIFFT)
 327                                 *va_arg(ap, ptrdiff_t *) = nread;
 328                         else
 329                                 *va_arg(ap, int *) = nread;
 330                         continue;
 331
 332                 default:
 333                         goto match_failure;
 334
 335                 /*
 336                  * Disgusting backwards compatibility hack.     XXX
 337                  */
 338                 case '\0':      /* compat */
 339                         return (EOF);
 340                 }
 341
 342                 /*
 343                  * Consume leading white space, except for formats
 344                  * that suppress this.
 345                  */
 346                 if ((flags & NOSKIP) == 0) {
 347                         while ((wi = __fgetwc(fp)) != WEOF && iswspace(wi))
 348                                 nread++;
 349                         if (wi == WEOF)
 350                                 goto input_failure;
 351                         __ungetwc(wi, fp);
 352                 }
 353
 354                 /*
 355                  * Do the conversion.
 356                  */
 357                 switch (c) {
 358
 359                 case CT_CHAR:
 360                         /* scan arbitrary characters (sets NOSKIP) */
 361                         if (width == 0)
 362                                 width = 1;
 363                         if (flags & LONG) {
 364                                 if (!(flags & SUPPRESS))
 365                                         p = va_arg(ap, wchar_t *);
 366                                 n = 0;
 367                                 while (width-- != 0 &&
 368                                     (wi = __fgetwc(fp)) != WEOF) {
 369                                         if (!(flags & SUPPRESS))
 370                                                 *p++ = (wchar_t)wi;
 371                                         n++;
 372                                 }
 373                                 if (n == 0)
 374                                         goto input_failure;
 375                                 nread += n;
 376                                 if (!(flags & SUPPRESS))
 377                                         nassigned++;
 378                         } else {
 379                                 if (!(flags & SUPPRESS))
 380                                         mbp = va_arg(ap, char *);
 381                                 n = 0;
 382                                 memset(&mbs, 0, sizeof(mbs));
 383                                 while (width != 0 &&
 384                                     (wi = __fgetwc(fp)) != WEOF) {
 385                                         if (width >= MB_CUR_MAX &&
 386                                             !(flags & SUPPRESS)) {
 387                                                 nconv = wcrtomb(mbp, wi, &mbs);
 388                                                 if (nconv == (size_t)-1)
 389                                                         goto input_failure;
 390                                         } else {
 391                                                 nconv = wcrtomb(mbbuf, wi,
 392                                                     &mbs);
 393                                                 if (nconv == (size_t)-1)
 394                                                         goto input_failure;
 395                                                 if (nconv > width) {
 396                                                         __ungetwc(wi, fp);
 397                                                         break;
 398                                                 }
 399                                                 if (!(flags & SUPPRESS))
 400                                                         memcpy(mbp, mbbuf,
 401                                                             nconv);
 402                                         }
 403                                         if (!(flags & SUPPRESS))
 404                                                 mbp += nconv;
 405                                         width -= nconv;
 406                                         n++;
 407                                 }
 408                                 if (n == 0)
 409                                         goto input_failure;
 410                                 nread += n;
 411                                 if (!(flags & SUPPRESS))
 412                                         nassigned++;
 413                         }
 414                         nconversions++;
 415                         break;
 416
 417                 case CT_CCL:
 418                         /* scan a (nonempty) character class (sets NOSKIP) */
 419                         if (width == 0)
 420                                 width = (size_t)~0;     /* `infinity' */
 421                         /* take only those things in the class */
 422                         if ((flags & SUPPRESS) && (flags & LONG)) {
 423                                 n = 0;
 424                                 while ((wi = __fgetwc(fp)) != WEOF &&
 425                                     width-- != 0 && INCCL(wi))
 426                                         n++;
 427                                 if (wi != WEOF)
 428                                         __ungetwc(wi, fp);
 429                                 if (n == 0)
 430                                         goto match_failure;
 431                         } else if (flags & LONG) {
 432                                 p0 = p = va_arg(ap, wchar_t *);
 433                                 while ((wi = __fgetwc(fp)) != WEOF &&
 434                                     width-- != 0 && INCCL(wi))
 435                                         *p++ = (wchar_t)wi;
 436                                 if (wi != WEOF)
 437                                         __ungetwc(wi, fp);
 438                                 n = p - p0;
 439                                 if (n == 0)
 440                                         goto match_failure;
 441                                 *p = 0;
 442                                 nassigned++;
 443                         } else {
 444                                 if (!(flags & SUPPRESS))
 445                                         mbp = va_arg(ap, char *);
 446                                 n = 0;
 447                                 memset(&mbs, 0, sizeof(mbs));
 448                                 while ((wi = __fgetwc(fp)) != WEOF &&
 449                                     width != 0 && INCCL(wi)) {
 450                                         if (width >= MB_CUR_MAX &&
 451                                            !(flags & SUPPRESS)) {
 452                                                 nconv = wcrtomb(mbp, wi, &mbs);
 453                                                 if (nconv == (size_t)-1)
 454                                                         goto input_failure;
 455                                         } else {
 456                                                 nconv = wcrtomb(mbbuf, wi,
 457                                                     &mbs);
 458                                                 if (nconv == (size_t)-1)
 459                                                         goto input_failure;
 460                                                 if (nconv > width)
 461                                                         break;
 462                                                 if (!(flags & SUPPRESS))
 463                                                         memcpy(mbp, mbbuf,
 464                                                             nconv);
 465                                         }
 466                                         if (!(flags & SUPPRESS))
 467                                                 mbp += nconv;
 468                                         width -= nconv;
 469                                         n++;
 470                                 }
 471                                 if (wi != WEOF)
 472                                         __ungetwc(wi, fp);
 473                                 if (!(flags & SUPPRESS)) {
 474                                         *mbp = 0;
 475                                         nassigned++;
 476                                 }
 477                         }
 478                         nread += n;
 479                         nconversions++;
 480                         break;
 481
 482                 case CT_STRING:
 483                         /* like CCL, but zero-length string OK, & no NOSKIP */
 484                         if (width == 0)
 485                                 width = (size_t)~0;
 486                         if ((flags & SUPPRESS) && (flags & LONG)) {
 487                                 while ((wi = __fgetwc(fp)) != WEOF &&
 488                                     width-- != 0 &&
 489                                     !iswspace(wi))
 490                                         nread++;
 491                                 if (wi != WEOF)
 492                                         __ungetwc(wi, fp);
 493                         } else if (flags & LONG) {
 494                                 p0 = p = va_arg(ap, wchar_t *);
 495                                 while ((wi = __fgetwc(fp)) != WEOF &&
 496                                     width-- != 0 &&
 497                                     !iswspace(wi)) {
 498                                         *p++ = (wchar_t)wi;
 499                                         nread++;
 500                                 }
 501                                 if (wi != WEOF)
 502                                         __ungetwc(wi, fp);
 503                                 *p = '\0';
 504                                 nassigned++;
 505                         } else {
 506                                 if (!(flags & SUPPRESS))
 507                                         mbp = va_arg(ap, char *);
 508                                 memset(&mbs, 0, sizeof(mbs));
 509                                 while ((wi = __fgetwc(fp)) != WEOF &&
 510                                     width != 0 &&
 511                                     !iswspace(wi)) {
 512                                         if (width >= MB_CUR_MAX &&
 513                                             !(flags & SUPPRESS)) {
 514                                                 nconv = wcrtomb(mbp, wi, &mbs);
 515                                                 if (nconv == (size_t)-1)
 516                                                         goto input_failure;
 517                                         } else {
 518                                                 nconv = wcrtomb(mbbuf, wi,
 519                                                     &mbs);
 520                                                 if (nconv == (size_t)-1)
 521                                                         goto input_failure;
 522                                                 if (nconv > width)
 523                                                         break;
 524                                                 if (!(flags & SUPPRESS))
 525                                                         memcpy(mbp, mbbuf,
 526                                                             nconv);
 527                                         }
 528                                         if (!(flags & SUPPRESS))
 529                                                 mbp += nconv;
 530                                         width -= nconv;
 531                                         nread++;
 532                                 }
 533                                 if (wi != WEOF)
 534                                         __ungetwc(wi, fp);
 535                                 if (!(flags & SUPPRESS)) {
 536                                         *mbp = 0;
 537                                         nassigned++;
 538                                 }
 539                         }
 540                         nconversions++;
 541                         continue;
 542
 543                 case CT_INT:
 544                         /* scan an integer as if by the conversion function */
 545                         if (width == 0 || width > sizeof(buf) /
 546                             sizeof(*buf) - 1)
 547                                 width = sizeof(buf) / sizeof(*buf) - 1;
 548                         flags |= SIGNOK | NDIGITS | NZDIGITS;
 549                         for (p = buf; width; width--) {
 550                                 c = __fgetwc(fp);
 551                                 /*
 552                                  * Switch on the character; `goto ok'
 553                                  * if we accept it as a part of number.
 554                                  */
 555                                 switch (c) {
 556
 557                                 /*
 558                                  * The digit 0 is always legal, but is
 559                                  * special.  For %i conversions, if no
 560                                  * digits (zero or nonzero) have been
 561                                  * scanned (only signs), we will have
 562                                  * base==0.  In that case, we should set
 563                                  * it to 8 and enable 0x prefixing.
 564                                  * Also, if we have not scanned zero digits
 565                                  * before this, do not turn off prefixing
 566                                  * (someone else will turn it off if we
 567                                  * have scanned any nonzero digits).
 568                                  */
 569                                 case '0':
 570                                         if (base == 0) {
 571                                                 base = 8;
 572                                                 flags |= PFXOK;
 573                                         }
 574                                         if (flags & NZDIGITS)
 575                                             flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
 576                                         else
 577                                             flags &= ~(SIGNOK|PFXOK|NDIGITS);
 578                                         goto ok;
 579
 580                                 /* 1 through 7 always legal */
 581                                 case '1': case '2': case '3':
 582                                 case '4': case '5': case '6': case '7':
 583                                         base = basefix[base];
 584                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 585                                         goto ok;
 586
 587                                 /* digits 8 and 9 ok iff decimal or hex */
 588                                 case '8': case '9':
 589                                         base = basefix[base];
 590                                         if (base <= 8)
 591                                                 break;  /* not legal here */
 592                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 593                                         goto ok;
 594
 595                                 /* letters ok iff hex */
 596                                 case 'A': case 'B': case 'C':
 597                                 case 'D': case 'E': case 'F':
 598                                 case 'a': case 'b': case 'c':
 599                                 case 'd': case 'e': case 'f':
 600                                         /* no need to fix base here */
 601                                         if (base <= 10)
 602                                                 break;  /* not legal here */
 603                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 604                                         goto ok;
 605
 606                                 /* sign ok only as first character */
 607                                 case '+': case '-':
 608                                         if (flags & SIGNOK) {
 609                                                 flags &= ~SIGNOK;
 610                                                 goto ok;
 611                                         }
 612                                         break;
 613
 614                                 /* x ok iff flag still set & 2nd char */
 615                                 case 'x': case 'X':
 616                                         if (flags & PFXOK && p == buf + 1) {
 617                                                 base = 16;      /* if %i */
 618                                                 flags &= ~PFXOK;
 619                                                 goto ok;
 620                                         }
 621                                         break;
 622                                 }
 623
 624                                 /*
 625                                  * If we got here, c is not a legal character
 626                                  * for a number.  Stop accumulating digits.
 627                                  */
 628                                 if (c != WEOF)
 629                                         __ungetwc(c, fp);
 630                                 break;
 631                 ok:
 632                                 /*
 633                                  * c is legal: store it and look at the next.
 634                                  */
 635                                 *p++ = (wchar_t)c;
 636                         }
 637                         /*
 638                          * If we had only a sign, it is no good; push
 639                          * back the sign.  If the number ends in `x',
 640                          * it was [sign] '0' 'x', so push back the x
 641                          * and treat it as [sign] '0'.
 642                          */
 643                         if (flags & NDIGITS) {
 644                                 if (p > buf)
 645                                         __ungetwc(*--p, fp);
 646                                 goto match_failure;
 647                         }
 648                         c = p[-1];
 649                         if (c == 'x' || c == 'X') {
 650                                 --p;
 651                                 __ungetwc(c, fp);
 652                         }
 653                         if ((flags & SUPPRESS) == 0) {
 654                                 uintmax_t res;
 655
 656                                 *p = 0;
 657                                 if ((flags & UNSIGNED) == 0)
 658                                     res = wcstoimax(buf, NULL, base);
 659                                 else
 660                                     res = wcstoumax(buf, NULL, base);
 661                                 if (flags & POINTER)
 662                                         *va_arg(ap, void **) =
 663                                                         (void *)(uintptr_t)res;
 664                                 else if (flags & SHORTSHORT)
 665                                         *va_arg(ap, char *) = res;
 666                                 else if (flags & SHORT)
 667                                         *va_arg(ap, short *) = res;
 668                                 else if (flags & LONG)
 669                                         *va_arg(ap, long *) = res;
 670                                 else if (flags & LONGLONG)
 671                                         *va_arg(ap, long long *) = res;
 672                                 else if (flags & INTMAXT)
 673                                         *va_arg(ap, intmax_t *) = res;
 674                                 else if (flags & PTRDIFFT)
 675                                         *va_arg(ap, ptrdiff_t *) = res;
 676                                 else if (flags & SIZET)
 677                                         *va_arg(ap, size_t *) = res;
 678                                 else
 679                                         *va_arg(ap, int *) = res;
 680                                 nassigned++;
 681                         }
 682                         nread += p - buf;
 683                         nconversions++;
 684                         break;
 685
 686 #ifdef FLOATING_POINT
 687                 case CT_FLOAT:
 688                         /* scan a floating point number as if by strtod */
 689                         if (width == 0 || width > sizeof(buf) /
 690                             sizeof(*buf) - 1)
 691                                 width = sizeof(buf) / sizeof(*buf) - 1;
 692                         if ((width = parsefloat(fp, buf, buf + width)) == 0)
 693                                 goto match_failure;
 694                         if ((flags & SUPPRESS) == 0) {
 695                                 if (flags & LONGDBL) {
 696                                         long double res = wcstold(buf, &p);
 697                                         *va_arg(ap, long double *) = res;
 698                                 } else if (flags & LONG) {
 699                                         double res = wcstod(buf, &p);
 700                                         *va_arg(ap, double *) = res;
 701                                 } else {
 702                                         float res = wcstof(buf, &p);
 703                                         *va_arg(ap, float *) = res;
 704                                 }
 705                                 if (__scanfdebug && p - buf != width)
 706                                         abort();
 707                                 nassigned++;
 708                         }
 709                         nread += width;
 710                         nconversions++;
 711                         break;
 712 #endif /* FLOATING_POINT */
 713                 }
 714         }
 715 input_failure:
 716         return (nconversions != 0 ? nassigned : EOF);
 717 match_failure:
 718         return (nassigned);
 719 }
 720
 721 #ifdef FLOATING_POINT
 722 static int
 723 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end)
 724 {
 725         wchar_t *commit, *p;
 726         int infnanpos = 0;
 727         enum {
 728                 S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX,
 729                 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
 730         } state = S_START;
 731         wchar_t c;
 732         wchar_t decpt = (wchar_t)(unsigned char)*localeconv()->decimal_point;
 733         _Bool gotmantdig = 0, ishex = 0;
 734
 735         /*
 736          * We set commit = p whenever the string we have read so far
 737          * constitutes a valid representation of a floating point
 738          * number by itself.  At some point, the parse will complete
 739          * or fail, and we will ungetc() back to the last commit point.
 740          * To ensure that the file offset gets updated properly, it is
 741          * always necessary to read at least one character that doesn't
 742          * match; thus, we can't short-circuit "infinity" or "nan(...)".
 743          */
 744         commit = buf - 1;
 745         c = WEOF;
 746         for (p = buf; p < end; ) {
 747                 if ((c = __fgetwc(fp)) == WEOF)
 748                         break;
 749 reswitch:
 750                 switch (state) {
 751                 case S_START:
 752                         state = S_GOTSIGN;
 753                         if (c == '-' || c == '+')
 754                                 break;
 755                         else
 756                                 goto reswitch;
 757                 case S_GOTSIGN:
 758                         switch (c) {
 759                         case '0':
 760                                 state = S_MAYBEHEX;
 761                                 commit = p;
 762                                 break;
 763                         case 'I':
 764                         case 'i':
 765                                 state = S_INF;
 766                                 break;
 767                         case 'N':
 768                         case 'n':
 769                                 state = S_NAN;
 770                                 break;
 771                         default:
 772                                 state = S_DIGITS;
 773                                 goto reswitch;
 774                         }
 775                         break;
 776                 case S_INF:
 777                         if (infnanpos > 6 ||
 778                             (c != "nfinity"[infnanpos] &&
 779                              c != "NFINITY"[infnanpos]))
 780                                 goto parsedone;
 781                         if (infnanpos == 1 || infnanpos == 6)
 782                                 commit = p;     /* inf or infinity */
 783                         infnanpos++;
 784                         break;
 785                 case S_NAN:
 786                         switch (infnanpos) {
 787                         case -1:        /* XXX kludge to deal with nan(...) */
 788                                 goto parsedone;
 789                         case 0:
 790                                 if (c != 'A' && c != 'a')
 791                                         goto parsedone;
 792                                 break;
 793                         case 1:
 794                                 if (c != 'N' && c != 'n')
 795                                         goto parsedone;
 796                                 else
 797                                         commit = p;
 798                                 break;
 799                         case 2:
 800                                 if (c != '(')
 801                                         goto parsedone;
 802                                 break;
 803                         default:
 804                                 if (c == ')') {
 805                                         commit = p;
 806                                         infnanpos = -2;
 807                                 } else if (!iswalnum(c) && c != '_')
 808                                         goto parsedone;
 809                                 break;
 810                         }
 811                         infnanpos++;
 812                         break;
 813                 case S_MAYBEHEX:
 814                         state = S_DIGITS;
 815                         if (c == 'X' || c == 'x') {
 816                                 ishex = 1;
 817                                 break;
 818                         } else {        /* we saw a '0', but no 'x' */
 819                                 gotmantdig = 1;
 820                                 goto reswitch;
 821                         }
 822                 case S_DIGITS:
 823                         if (ishex && iswxdigit(c) || iswdigit(c))
 824                                 gotmantdig = 1;
 825                         else {
 826                                 state = S_FRAC;
 827                                 if (c != decpt)
 828                                         goto reswitch;
 829                         }
 830                         if (gotmantdig)
 831                                 commit = p;
 832                         break;
 833                 case S_FRAC:
 834                         if ((c == 'E' || c == 'e') && !ishex ||
 835                             (c == 'P' || c == 'p') && ishex) {
 836                                 if (!gotmantdig)
 837                                         goto parsedone;
 838                                 else
 839                                         state = S_EXP;
 840                         } else if (ishex && iswxdigit(c) || iswdigit(c)) {
 841                                 commit = p;
 842                                 gotmantdig = 1;
 843                         } else
 844                                 goto parsedone;
 845                         break;
 846                 case S_EXP:
 847                         state = S_EXPDIGITS;
 848                         if (c == '-' || c == '+')
 849                                 break;
 850                         else
 851                                 goto reswitch;
 852                 case S_EXPDIGITS:
 853                         if (iswdigit(c))
 854                                 commit = p;
 855                         else
 856                                 goto parsedone;
 857                         break;
 858                 default:
 859                         abort();
 860                 }
 861                 *p++ = c;
 862                 c = WEOF;
 863         }
 864
 865 parsedone:
 866         if (c != WEOF)
 867                 __ungetwc(c, fp);
 868         while (commit < --p)
 869                 __ungetwc(*p, fp);
 870         *++commit = '\0';
 871         return (commit - buf);
 872 }
 873 #endif