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 #if 0
  38 #if defined(LIBC_SCCS) && !defined(lint)
  39 static char sccsid[] = "@(#)vfscanf.c   8.1 (Berkeley) 6/4/93";
  40 #endif /* LIBC_SCCS and not lint */
  41 #endif
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD: src/lib/libc/stdio/vfwscanf.c,v 1.12 2004/05/02 20:13:29 obrien Exp $");
  44
  45 #include "namespace.h"
  46 #include <ctype.h>
  47 #include <inttypes.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <stddef.h>
  51 #include <stdarg.h>
  52 #include <string.h>
  53 #include <wchar.h>
  54 #include <wctype.h>
  55 #include "un-namespace.h"
  56
  57 #include "libc_private.h"
  58 #include "local.h"
  59
  60 #ifndef NO_FLOATING_POINT
  61 #include <locale.h>
  62 #endif
  63
  64 #define BUF             513     /* Maximum length of numeric string. */
  65
  66 /*
  67  * Flags used during conversion.
  68  */
  69 #define LONG            0x01    /* l: long or double */
  70 #define LONGDBL         0x02    /* L: long double */
  71 #define SHORT           0x04    /* h: short */
  72 #define SUPPRESS        0x08    /* *: suppress assignment */
  73 #define POINTER         0x10    /* p: void * (as hex) */
  74 #define NOSKIP          0x20    /* [ or c: do not skip blanks */
  75 #define LONGLONG        0x400   /* ll: long long (+ deprecated q: quad) */
  76 #define INTMAXT         0x800   /* j: intmax_t */
  77 #define PTRDIFFT        0x1000  /* t: ptrdiff_t */
  78 #define SIZET           0x2000  /* z: size_t */
  79 #define SHORTSHORT      0x4000  /* hh: char */
  80 #define UNSIGNED        0x8000  /* %[oupxX] conversions */
  81
  82 /*
  83  * The following are used in integral conversions only:
  84  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
  85  */
  86 #define SIGNOK          0x40    /* +/- is (still) legal */
  87 #define NDIGITS         0x80    /* no digits detected */
  88 #define PFXOK           0x100   /* 0x prefix is (still) legal */
  89 #define NZDIGITS        0x200   /* no zero digits detected */
  90 #define HAVESIGN        0x10000 /* sign detected */
  91
  92 /*
  93  * Conversion types.
  94  */
  95 #define CT_CHAR         0       /* %c conversion */
  96 #define CT_CCL          1       /* %[...] conversion */
  97 #define CT_STRING       2       /* %s conversion */
  98 #define CT_INT          3       /* %[dioupxX] conversion */
  99 #define CT_FLOAT        4       /* %[efgEFG] conversion */
 100
 101 static int parsefloat(FILE *, wchar_t *, wchar_t *);
 102
 103 extern int __scanfdebug;
 104
 105 #define INCCL(_c)       \
 106         (cclcompl ? (wmemchr(ccls, (_c), ccle - ccls) == NULL) : \
 107         (wmemchr(ccls, (_c), ccle - ccls) != NULL))
 108
 109 /*
 110  * MT-safe version.
 111  */
 112 int
 113 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 114 {
 115         int ret;
 116
 117         FLOCKFILE(fp);
 118         ORIENT(fp, 1);
 119         ret = __vfwscanf(fp, fmt, ap);
 120         FUNLOCKFILE(fp);
 121         return (ret);
 122 }
 123
 124 /*
 125  * Non-MT-safe version.
 126  */
 127 int
 128 __vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 129 {
 130         wint_t c;               /* character from format, or conversion */
 131         size_t width;           /* field width, or 0 */
 132         wchar_t *p;             /* points into all kinds of strings */
 133         int n;                  /* handy integer */
 134         int flags;              /* flags as defined above */
 135         wchar_t *p0;            /* saves original value of p when necessary */
 136         int nassigned;          /* number of fields assigned */
 137         int nconversions;       /* number of conversions */
 138         int nread;              /* number of characters consumed from fp */
 139         int base;               /* base argument to conversion function */
 140         wchar_t buf[BUF];       /* buffer for numeric conversions */
 141         const wchar_t *ccls;    /* character class start */
 142         const wchar_t *ccle;    /* character class end */
 143         int cclcompl;           /* ccl is complemented? */
 144         wint_t wi;              /* handy wint_t */
 145         char *mbp;              /* multibyte string pointer for %c %s %[ */
 146         size_t nconv;           /* number of bytes in mb. conversion */
 147         char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */
 148         static const mbstate_t initial;
 149         mbstate_t mbs;
 150
 151         /* `basefix' is used to avoid `if' tests in the integer scanner */
 152         static short basefix[17] =
 153                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
 154
 155         nassigned = 0;
 156         nconversions = 0;
 157         nread = 0;
 158         ccls = ccle = NULL;
 159         for (;;) {
 160                 c = *fmt++;
 161                 if (c == 0)
 162                         return (nassigned);
 163                 if (iswspace(c)) {
 164                         while ((c = __fgetwc(fp)) != WEOF &&
 165                             iswspace(c))
 166                                 ;
 167                         if (c != WEOF)
 168                                 __ungetwc(c, fp);
 169                         continue;
 170                 }
 171                 if (c != '%')
 172                         goto literal;
 173                 width = 0;
 174                 flags = 0;
 175                 /*
 176                  * switch on the format.  continue if done;
 177                  * break once format type is derived.
 178                  */
 179 again:          c = *fmt++;
 180                 switch (c) {
 181                 case '%':
 182 literal:
 183                         if ((wi = __fgetwc(fp)) == WEOF)
 184                                 goto input_failure;
 185                         if (wi != c) {
 186                                 __ungetwc(wi, fp);
 187                                 goto input_failure;
 188                         }
 189                         nread++;
 190                         continue;
 191
 192                 case '*':
 193                         flags |= SUPPRESS;
 194                         goto again;
 195                 case 'j':
 196                         flags |= INTMAXT;
 197                         goto again;
 198                 case 'l':
 199                         if (flags & LONG) {
 200                                 flags &= ~LONG;
 201                                 flags |= LONGLONG;
 202                         } else
 203                                 flags |= LONG;
 204                         goto again;
 205                 case 'q':
 206                         flags |= LONGLONG;      /* not quite */
 207                         goto again;
 208                 case 't':
 209                         flags |= PTRDIFFT;
 210                         goto again;
 211                 case 'z':
 212                         flags |= SIZET;
 213                         goto again;
 214                 case 'L':
 215                         flags |= LONGDBL;
 216                         goto again;
 217                 case 'h':
 218                         if (flags & SHORT) {
 219                                 flags &= ~SHORT;
 220                                 flags |= SHORTSHORT;
 221                         } else
 222                                 flags |= SHORT;
 223                         goto again;
 224
 225                 case '0': case '1': case '2': case '3': case '4':
 226                 case '5': case '6': case '7': case '8': case '9':
 227                         width = width * 10 + c - '0';
 228                         goto again;
 229
 230                 /*
 231                  * Conversions.
 232                  */
 233                 case 'd':
 234                         c = CT_INT;
 235                         base = 10;
 236                         break;
 237
 238                 case 'i':
 239                         c = CT_INT;
 240                         base = 0;
 241                         break;
 242
 243                 case 'o':
 244                         c = CT_INT;
 245                         flags |= UNSIGNED;
 246                         base = 8;
 247                         break;
 248
 249                 case 'u':
 250                         c = CT_INT;
 251                         flags |= UNSIGNED;
 252                         base = 10;
 253                         break;
 254
 255                 case 'X':
 256                 case 'x':
 257                         flags |= PFXOK; /* enable 0x prefixing */
 258                         c = CT_INT;
 259                         flags |= UNSIGNED;
 260                         base = 16;
 261                         break;
 262
 263 #ifndef NO_FLOATING_POINT
 264                 case 'A': case 'E': case 'F': case 'G':
 265                 case 'a': case 'e': case 'f': case 'g':
 266                         c = CT_FLOAT;
 267                         break;
 268 #endif
 269
 270                 case 'S':
 271                         flags |= LONG;
 272                         /* FALLTHROUGH */
 273                 case 's':
 274                         c = CT_STRING;
 275                         break;
 276
 277                 case '[':
 278                         ccls = fmt;
 279                         if (*fmt == '^') {
 280                                 cclcompl = 1;
 281                                 fmt++;
 282                         } else
 283                                 cclcompl = 0;
 284                         if (*fmt == ']')
 285                                 fmt++;
 286                         while (*fmt != '\0' && *fmt != ']')
 287                                 fmt++;
 288                         ccle = fmt;
 289                         fmt++;
 290                         flags |= NOSKIP;
 291                         c = CT_CCL;
 292                         break;
 293
 294                 case 'C':
 295                         flags |= LONG;
 296                         /* FALLTHROUGH */
 297                 case 'c':
 298                         flags |= NOSKIP;
 299                         c = CT_CHAR;
 300                         break;
 301
 302                 case 'p':       /* pointer format is like hex */
 303                         flags |= POINTER | PFXOK;
 304                         c = CT_INT;             /* assumes sizeof(uintmax_t) */
 305                         flags |= UNSIGNED;      /*      >= sizeof(uintptr_t) */
 306                         base = 16;
 307                         break;
 308
 309                 case 'n':
 310                         nconversions++;
 311                         if (flags & SUPPRESS)   /* ??? */
 312                                 continue;
 313                         if (flags & SHORTSHORT)
 314                                 *va_arg(ap, char *) = nread;
 315                         else if (flags & SHORT)
 316                                 *va_arg(ap, short *) = nread;
 317                         else if (flags & LONG)
 318                                 *va_arg(ap, long *) = nread;
 319                         else if (flags & LONGLONG)
 320                                 *va_arg(ap, long long *) = nread;
 321                         else if (flags & INTMAXT)
 322                                 *va_arg(ap, intmax_t *) = nread;
 323                         else if (flags & SIZET)
 324                                 *va_arg(ap, size_t *) = nread;
 325                         else if (flags & PTRDIFFT)
 326                                 *va_arg(ap, ptrdiff_t *) = nread;
 327                         else
 328                                 *va_arg(ap, int *) = nread;
 329                         continue;
 330
 331                 default:
 332                         goto match_failure;
 333
 334                 /*
 335                  * Disgusting backwards compatibility hack.     XXX
 336                  */
 337                 case '\0':      /* compat */
 338                         return (EOF);
 339                 }
 340
 341                 /*
 342                  * Consume leading white space, except for formats
 343                  * that suppress this.
 344                  */
 345                 if ((flags & NOSKIP) == 0) {
 346                         while ((wi = __fgetwc(fp)) != WEOF && iswspace(wi))
 347                                 nread++;
 348                         if (wi == WEOF)
 349                                 goto input_failure;
 350                         __ungetwc(wi, fp);
 351                 }
 352
 353                 /*
 354                  * Do the conversion.
 355                  */
 356                 switch (c) {
 357
 358                 case CT_CHAR:
 359                         /* scan arbitrary characters (sets NOSKIP) */
 360                         if (width == 0)
 361                                 width = 1;
 362                         if (flags & LONG) {
 363                                 if (!(flags & SUPPRESS))
 364                                         p = va_arg(ap, wchar_t *);
 365                                 n = 0;
 366                                 while (width-- != 0 &&
 367                                     (wi = __fgetwc(fp)) != WEOF) {
 368                                         if (!(flags & SUPPRESS))
 369                                                 *p++ = (wchar_t)wi;
 370                                         n++;
 371                                 }
 372                                 if (n == 0)
 373                                         goto input_failure;
 374                                 nread += n;
 375                                 if (!(flags & SUPPRESS))
 376                                         nassigned++;
 377                         } else {
 378                                 if (!(flags & SUPPRESS))
 379                                         mbp = va_arg(ap, char *);
 380                                 n = 0;
 381                                 mbs = initial;
 382                                 while (width != 0 &&
 383                                     (wi = __fgetwc(fp)) != WEOF) {
 384                                         if (width >= MB_CUR_MAX &&
 385                                             !(flags & SUPPRESS)) {
 386                                                 nconv = wcrtomb(mbp, wi, &mbs);
 387                                                 if (nconv == (size_t)-1)
 388                                                         goto input_failure;
 389                                         } else {
 390                                                 nconv = wcrtomb(mbbuf, wi,
 391                                                     &mbs);
 392                                                 if (nconv == (size_t)-1)
 393                                                         goto input_failure;
 394                                                 if (nconv > width) {
 395                                                         __ungetwc(wi, fp);
 396                                                         break;
 397                                                 }
 398                                                 if (!(flags & SUPPRESS))
 399                                                         memcpy(mbp, mbbuf,
 400                                                             nconv);
 401                                         }
 402                                         if (!(flags & SUPPRESS))
 403                                                 mbp += nconv;
 404                                         width -= nconv;
 405                                         n++;
 406                                 }
 407                                 if (n == 0)
 408                                         goto input_failure;
 409                                 nread += n;
 410                                 if (!(flags & SUPPRESS))
 411                                         nassigned++;
 412                         }
 413                         nconversions++;
 414                         break;
 415
 416                 case CT_CCL:
 417                         /* scan a (nonempty) character class (sets NOSKIP) */
 418                         if (width == 0)
 419                                 width = (size_t)~0;     /* `infinity' */
 420                         /* take only those things in the class */
 421                         if ((flags & SUPPRESS) && (flags & LONG)) {
 422                                 n = 0;
 423                                 while ((wi = __fgetwc(fp)) != WEOF &&
 424                                     width-- != 0 && INCCL(wi))
 425                                         n++;
 426                                 if (wi != WEOF)
 427                                         __ungetwc(wi, fp);
 428                                 if (n == 0)
 429                                         goto match_failure;
 430                         } else if (flags & LONG) {
 431                                 p0 = p = va_arg(ap, wchar_t *);
 432                                 while ((wi = __fgetwc(fp)) != WEOF &&
 433                                     width-- != 0 && INCCL(wi))
 434                                         *p++ = (wchar_t)wi;
 435                                 if (wi != WEOF)
 436                                         __ungetwc(wi, fp);
 437                                 n = p - p0;
 438                                 if (n == 0)
 439                                         goto match_failure;
 440                                 *p = 0;
 441                                 nassigned++;
 442                         } else {
 443                                 if (!(flags & SUPPRESS))
 444                                         mbp = va_arg(ap, char *);
 445                                 n = 0;
 446                                 mbs = initial;
 447                                 while ((wi = __fgetwc(fp)) != WEOF &&
 448                                     width != 0 && INCCL(wi)) {
 449                                         if (width >= MB_CUR_MAX &&
 450                                            !(flags & SUPPRESS)) {
 451                                                 nconv = wcrtomb(mbp, wi, &mbs);
 452                                                 if (nconv == (size_t)-1)
 453                                                         goto input_failure;
 454                                         } else {
 455                                                 nconv = wcrtomb(mbbuf, wi,
 456                                                     &mbs);
 457                                                 if (nconv == (size_t)-1)
 458                                                         goto input_failure;
 459                                                 if (nconv > width)
 460                                                         break;
 461                                                 if (!(flags & SUPPRESS))
 462                                                         memcpy(mbp, mbbuf,
 463                                                             nconv);
 464                                         }
 465                                         if (!(flags & SUPPRESS))
 466                                                 mbp += nconv;
 467                                         width -= nconv;
 468                                         n++;
 469                                 }
 470                                 if (wi != WEOF)
 471                                         __ungetwc(wi, fp);
 472                                 if (!(flags & SUPPRESS)) {
 473                                         *mbp = 0;
 474                                         nassigned++;
 475                                 }
 476                         }
 477                         nread += n;
 478                         nconversions++;
 479                         break;
 480
 481                 case CT_STRING:
 482                         /* like CCL, but zero-length string OK, & no NOSKIP */
 483                         if (width == 0)
 484                                 width = (size_t)~0;
 485                         if ((flags & SUPPRESS) && (flags & LONG)) {
 486                                 while ((wi = __fgetwc(fp)) != WEOF &&
 487                                     width-- != 0 &&
 488                                     !iswspace(wi))
 489                                         nread++;
 490                                 if (wi != WEOF)
 491                                         __ungetwc(wi, fp);
 492                         } else if (flags & LONG) {
 493                                 p0 = p = va_arg(ap, wchar_t *);
 494                                 while ((wi = __fgetwc(fp)) != WEOF &&
 495                                     width-- != 0 &&
 496                                     !iswspace(wi)) {
 497                                         *p++ = (wchar_t)wi;
 498                                         nread++;
 499                                 }
 500                                 if (wi != WEOF)
 501                                         __ungetwc(wi, fp);
 502                                 *p = '\0';
 503                                 nassigned++;
 504                         } else {
 505                                 if (!(flags & SUPPRESS))
 506                                         mbp = va_arg(ap, char *);
 507                                 mbs = initial;
 508                                 while ((wi = __fgetwc(fp)) != WEOF &&
 509                                     width != 0 &&
 510                                     !iswspace(wi)) {
 511                                         if (width >= MB_CUR_MAX &&
 512                                             !(flags & SUPPRESS)) {
 513                                                 nconv = wcrtomb(mbp, wi, &mbs);
 514                                                 if (nconv == (size_t)-1)
 515                                                         goto input_failure;
 516                                         } else {
 517                                                 nconv = wcrtomb(mbbuf, wi,
 518                                                     &mbs);
 519                                                 if (nconv == (size_t)-1)
 520                                                         goto input_failure;
 521                                                 if (nconv > width)
 522                                                         break;
 523                                                 if (!(flags & SUPPRESS))
 524                                                         memcpy(mbp, mbbuf,
 525                                                             nconv);
 526                                         }
 527                                         if (!(flags & SUPPRESS))
 528                                                 mbp += nconv;
 529                                         width -= nconv;
 530                                         nread++;
 531                                 }
 532                                 if (wi != WEOF)
 533                                         __ungetwc(wi, fp);
 534                                 if (!(flags & SUPPRESS)) {
 535                                         *mbp = 0;
 536                                         nassigned++;
 537                                 }
 538                         }
 539                         nconversions++;
 540                         continue;
 541
 542                 case CT_INT:
 543                         /* scan an integer as if by the conversion function */
 544                         if (width == 0 || width > sizeof(buf) /
 545                             sizeof(*buf) - 1)
 546                                 width = sizeof(buf) / sizeof(*buf) - 1;
 547                         flags |= SIGNOK | NDIGITS | NZDIGITS;
 548                         for (p = buf; width; width--) {
 549                                 c = __fgetwc(fp);
 550                                 /*
 551                                  * Switch on the character; `goto ok'
 552                                  * if we accept it as a part of number.
 553                                  */
 554                                 switch (c) {
 555
 556                                 /*
 557                                  * The digit 0 is always legal, but is
 558                                  * special.  For %i conversions, if no
 559                                  * digits (zero or nonzero) have been
 560                                  * scanned (only signs), we will have
 561                                  * base==0.  In that case, we should set
 562                                  * it to 8 and enable 0x prefixing.
 563                                  * Also, if we have not scanned zero digits
 564                                  * before this, do not turn off prefixing
 565                                  * (someone else will turn it off if we
 566                                  * have scanned any nonzero digits).
 567                                  */
 568                                 case '0':
 569                                         if (base == 0) {
 570                                                 base = 8;
 571                                                 flags |= PFXOK;
 572                                         }
 573                                         if (flags & NZDIGITS)
 574                                             flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
 575                                         else
 576                                             flags &= ~(SIGNOK|PFXOK|NDIGITS);
 577                                         goto ok;
 578
 579                                 /* 1 through 7 always legal */
 580                                 case '1': case '2': case '3':
 581                                 case '4': case '5': case '6': case '7':
 582                                         base = basefix[base];
 583                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 584                                         goto ok;
 585
 586                                 /* digits 8 and 9 ok iff decimal or hex */
 587                                 case '8': case '9':
 588                                         base = basefix[base];
 589                                         if (base <= 8)
 590                                                 break;  /* not legal here */
 591                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 592                                         goto ok;
 593
 594                                 /* letters ok iff hex */
 595                                 case 'A': case 'B': case 'C':
 596                                 case 'D': case 'E': case 'F':
 597                                 case 'a': case 'b': case 'c':
 598                                 case 'd': case 'e': case 'f':
 599                                         /* no need to fix base here */
 600                                         if (base <= 10)
 601                                                 break;  /* not legal here */
 602                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 603                                         goto ok;
 604
 605                                 /* sign ok only as first character */
 606                                 case '+': case '-':
 607                                         if (flags & SIGNOK) {
 608                                                 flags &= ~SIGNOK;
 609                                                 flags |= HAVESIGN;
 610                                                 goto ok;
 611                                         }
 612                                         break;
 613
 614                                 /*
 615                                  * x ok iff flag still set & 2nd char (or
 616                                  * 3rd char if we have a sign).
 617                                  */
 618                                 case 'x': case 'X':
 619                                         if (flags & PFXOK && p ==
 620                                             buf + 1 + !!(flags & HAVESIGN)) {
 621                                                 base = 16;      /* if %i */
 622                                                 flags &= ~PFXOK;
 623                                                 goto ok;
 624                                         }
 625                                         break;
 626                                 }
 627
 628                                 /*
 629                                  * If we got here, c is not a legal character
 630                                  * for a number.  Stop accumulating digits.
 631                                  */
 632                                 if (c != WEOF)
 633                                         __ungetwc(c, fp);
 634                                 break;
 635                 ok:
 636                                 /*
 637                                  * c is legal: store it and look at the next.
 638                                  */
 639                                 *p++ = (wchar_t)c;
 640                         }
 641                         /*
 642                          * If we had only a sign, it is no good; push
 643                          * back the sign.  If the number ends in `x',
 644                          * it was [sign] '0' 'x', so push back the x
 645                          * and treat it as [sign] '0'.
 646                          */
 647                         if (flags & NDIGITS) {
 648                                 if (p > buf)
 649                                         __ungetwc(*--p, fp);
 650                                 goto match_failure;
 651                         }
 652                         c = p[-1];
 653                         if (c == 'x' || c == 'X') {
 654                                 --p;
 655                                 __ungetwc(c, fp);
 656                         }
 657                         if ((flags & SUPPRESS) == 0) {
 658                                 uintmax_t res;
 659
 660                                 *p = 0;
 661                                 if ((flags & UNSIGNED) == 0)
 662                                     res = wcstoimax(buf, NULL, base);
 663                                 else
 664                                     res = wcstoumax(buf, NULL, base);
 665                                 if (flags & POINTER)
 666                                         *va_arg(ap, void **) =
 667                                                         (void *)(uintptr_t)res;
 668                                 else if (flags & SHORTSHORT)
 669                                         *va_arg(ap, char *) = res;
 670                                 else if (flags & SHORT)
 671                                         *va_arg(ap, short *) = res;
 672                                 else if (flags & LONG)
 673                                         *va_arg(ap, long *) = res;
 674                                 else if (flags & LONGLONG)
 675                                         *va_arg(ap, long long *) = res;
 676                                 else if (flags & INTMAXT)
 677                                         *va_arg(ap, intmax_t *) = res;
 678                                 else if (flags & PTRDIFFT)
 679                                         *va_arg(ap, ptrdiff_t *) = res;
 680                                 else if (flags & SIZET)
 681                                         *va_arg(ap, size_t *) = res;
 682                                 else
 683                                         *va_arg(ap, int *) = res;
 684                                 nassigned++;
 685                         }
 686                         nread += p - buf;
 687                         nconversions++;
 688                         break;
 689
 690 #ifndef NO_FLOATING_POINT
 691                 case CT_FLOAT:
 692                         /* scan a floating point number as if by strtod */
 693                         if (width == 0 || width > sizeof(buf) /
 694                             sizeof(*buf) - 1)
 695                                 width = sizeof(buf) / sizeof(*buf) - 1;
 696                         if ((width = parsefloat(fp, buf, buf + width)) == 0)
 697                                 goto match_failure;
 698                         if ((flags & SUPPRESS) == 0) {
 699                                 if (flags & LONGDBL) {
 700                                         long double res = wcstold(buf, &p);
 701                                         *va_arg(ap, long double *) = res;
 702                                 } else if (flags & LONG) {
 703                                         double res = wcstod(buf, &p);
 704                                         *va_arg(ap, double *) = res;
 705                                 } else {
 706                                         float res = wcstof(buf, &p);
 707                                         *va_arg(ap, float *) = res;
 708                                 }
 709                                 if (__scanfdebug && p - buf != width)
 710                                         abort();
 711                                 nassigned++;
 712                         }
 713                         nread += width;
 714                         nconversions++;
 715                         break;
 716 #endif /* !NO_FLOATING_POINT */
 717                 }
 718         }
 719 input_failure:
 720         return (nconversions != 0 ? nassigned : EOF);
 721 match_failure:
 722         return (nassigned);
 723 }
 724
 725 #ifndef NO_FLOATING_POINT
 726 static int
 727 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end)
 728 {
 729         wchar_t *commit, *p;
 730         int infnanpos = 0;
 731         enum {
 732                 S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX,
 733                 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
 734         } state = S_START;
 735         wchar_t c;
 736         wchar_t decpt = (wchar_t)(unsigned char)*localeconv()->decimal_point;
 737         _Bool gotmantdig = 0, ishex = 0;
 738
 739         /*
 740          * We set commit = p whenever the string we have read so far
 741          * constitutes a valid representation of a floating point
 742          * number by itself.  At some point, the parse will complete
 743          * or fail, and we will ungetc() back to the last commit point.
 744          * To ensure that the file offset gets updated properly, it is
 745          * always necessary to read at least one character that doesn't
 746          * match; thus, we can't short-circuit "infinity" or "nan(...)".
 747          */
 748         commit = buf - 1;
 749         c = WEOF;
 750         for (p = buf; p < end; ) {
 751                 if ((c = __fgetwc(fp)) == WEOF)
 752                         break;
 753 reswitch:
 754                 switch (state) {
 755                 case S_START:
 756                         state = S_GOTSIGN;
 757                         if (c == '-' || c == '+')
 758                                 break;
 759                         else
 760                                 goto reswitch;
 761                 case S_GOTSIGN:
 762                         switch (c) {
 763                         case '0':
 764                                 state = S_MAYBEHEX;
 765                                 commit = p;
 766                                 break;
 767                         case 'I':
 768                         case 'i':
 769                                 state = S_INF;
 770                                 break;
 771                         case 'N':
 772                         case 'n':
 773                                 state = S_NAN;
 774                                 break;
 775                         default:
 776                                 state = S_DIGITS;
 777                                 goto reswitch;
 778                         }
 779                         break;
 780                 case S_INF:
 781                         if (infnanpos > 6 ||
 782                             (c != "nfinity"[infnanpos] &&
 783                              c != "NFINITY"[infnanpos]))
 784                                 goto parsedone;
 785                         if (infnanpos == 1 || infnanpos == 6)
 786                                 commit = p;     /* inf or infinity */
 787                         infnanpos++;
 788                         break;
 789                 case S_NAN:
 790                         switch (infnanpos) {
 791                         case -1:        /* XXX kludge to deal with nan(...) */
 792                                 goto parsedone;
 793                         case 0:
 794                                 if (c != 'A' && c != 'a')
 795                                         goto parsedone;
 796                                 break;
 797                         case 1:
 798                                 if (c != 'N' && c != 'n')
 799                                         goto parsedone;
 800                                 else
 801                                         commit = p;
 802                                 break;
 803                         case 2:
 804                                 if (c != '(')
 805                                         goto parsedone;
 806                                 break;
 807                         default:
 808                                 if (c == ')') {
 809                                         commit = p;
 810                                         infnanpos = -2;
 811                                 } else if (!iswalnum(c) && c != '_')
 812                                         goto parsedone;
 813                                 break;
 814                         }
 815                         infnanpos++;
 816                         break;
 817                 case S_MAYBEHEX:
 818                         state = S_DIGITS;
 819                         if (c == 'X' || c == 'x') {
 820                                 ishex = 1;
 821                                 break;
 822                         } else {        /* we saw a '0', but no 'x' */
 823                                 gotmantdig = 1;
 824                                 goto reswitch;
 825                         }
 826                 case S_DIGITS:
 827                         if ((ishex && iswxdigit(c)) || iswdigit(c))
 828                                 gotmantdig = 1;
 829                         else {
 830                                 state = S_FRAC;
 831                                 if (c != decpt)
 832                                         goto reswitch;
 833                         }
 834                         if (gotmantdig)
 835                                 commit = p;
 836                         break;
 837                 case S_FRAC:
 838                         if (((c == 'E' || c == 'e') && !ishex) ||
 839                             ((c == 'P' || c == 'p') && ishex)) {
 840                                 if (!gotmantdig)
 841                                         goto parsedone;
 842                                 else
 843                                         state = S_EXP;
 844                         } else if ((ishex && iswxdigit(c)) || iswdigit(c)) {
 845                                 commit = p;
 846                                 gotmantdig = 1;
 847                         } else
 848                                 goto parsedone;
 849                         break;
 850                 case S_EXP:
 851                         state = S_EXPDIGITS;
 852                         if (c == '-' || c == '+')
 853                                 break;
 854                         else
 855                                 goto reswitch;
 856                 case S_EXPDIGITS:
 857                         if (iswdigit(c))
 858                                 commit = p;
 859                         else
 860                                 goto parsedone;
 861                         break;
 862                 default:
 863                         abort();
 864                 }
 865                 *p++ = c;
 866                 c = WEOF;
 867         }
 868
 869 parsedone:
 870         if (c != WEOF)
 871                 __ungetwc(c, fp);
 872         while (commit < --p)
 873                 __ungetwc(*p, fp);
 874         *++commit = '\0';
 875         return (commit - buf);
 876 }
 877 #endif