lib/libc/stdio/vfwscanf.c

   1 /*      $NetBSD: vfwscanf.c,v 1.8 2012/03/15 18:22:30 christos Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Chris Torek.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #if defined(LIBC_SCCS) && !defined(lint)
  41 #if 0
  42 static char sccsid[] = "@(#)ftell.c     8.2 (Berkeley) 5/4/95";
  43 __FBSDID("$FreeBSD: src/lib/libc/stdio/vfwscanf.c,v 1.12 2004/05/02 20:13:29 obrien Exp $");
  44 #else
  45 __RCSID("$NetBSD: vfwscanf.c,v 1.8 2012/03/15 18:22:30 christos Exp $");
  46 #endif
  47 #endif /* LIBC_SCCS and not lint */
  48
  49 #include "namespace.h"
  50 #include <ctype.h>
  51 #include <inttypes.h>
  52 #include <assert.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <stddef.h>
  56 #include <stdarg.h>
  57 #include <string.h>
  58 #include <limits.h>
  59 #include <wchar.h>
  60 #include <wctype.h>
  61
  62 #include "reentrant.h"
  63 #include "local.h"
  64
  65 #ifndef NO_FLOATING_POINT
  66 #include <locale.h>
  67 #endif
  68
  69 #define BUF             513     /* Maximum length of numeric string. */
  70
  71 /*
  72  * Flags used during conversion.
  73  */
  74 #define LONG            0x01    /* l: long or double */
  75 #define LONGDBL         0x02    /* L: long double */
  76 #define SHORT           0x04    /* h: short */
  77 #define SUPPRESS        0x08    /* *: suppress assignment */
  78 #define POINTER         0x10    /* p: void * (as hex) */
  79 #define NOSKIP          0x20    /* [ or c: do not skip blanks */
  80 #define LONGLONG        0x400   /* ll: quad_t (+ deprecated q: quad) */
  81 #define INTMAXT         0x800   /* j: intmax_t */
  82 #define PTRDIFFT        0x1000  /* t: ptrdiff_t */
  83 #define SIZET           0x2000  /* z: size_t */
  84 #define SHORTSHORT      0x4000  /* hh: char */
  85 #define UNSIGNED        0x8000  /* %[oupxX] conversions */
  86
  87 /*
  88  * The following are used in integral conversions only:
  89  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
  90  */
  91 #define SIGNOK          0x40    /* +/- is (still) legal */
  92 #define NDIGITS         0x80    /* no digits detected */
  93 #define PFXOK           0x100   /* 0x prefix is (still) legal */
  94 #define NZDIGITS        0x200   /* no zero digits detected */
  95 #define HAVESIGN        0x10000 /* sign detected */
  96
  97 /*
  98  * Conversion types.
  99  */
 100 #define CT_CHAR         0       /* %c conversion */
 101 #define CT_CCL          1       /* %[...] conversion */
 102 #define CT_STRING       2       /* %s conversion */
 103 #define CT_INT          3       /* %[dioupxX] conversion */
 104 #define CT_FLOAT        4       /* %[efgEFG] conversion */
 105
 106 static int parsefloat(FILE *, wchar_t *, wchar_t *);
 107
 108 #define INCCL(_c)       \
 109         (cclcompl ? (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) == NULL) : \
 110         (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) != NULL))
 111
 112 /*
 113  * MT-safe version.
 114  */
 115 int
 116 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 117 {
 118         int ret;
 119
 120         FLOCKFILE(fp);
 121         _SET_ORIENTATION(fp, 1);
 122         ret = __vfwscanf_unlocked(fp, fmt, ap);
 123         FUNLOCKFILE(fp);
 124         return ret;
 125 }
 126
 127 #define SCANF_SKIP_SPACE() \
 128 do { \
 129         wint_t tc; \
 130  \
 131         while ((tc = __fgetwc_unlock(fp)) != WEOF && iswspace(tc)) \
 132                 continue; \
 133         if (tc != WEOF) \
 134                 ungetwc(tc, fp); \
 135 } while (/*CONSTCOND*/ 0)
 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;             /* 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         size_t 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         static const mbstate_t initial;
 162         mbstate_t mbs;
 163
 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 = ccle = NULL;
 172         base = 0;
 173         cclcompl = 0;
 174         mbp = NULL;
 175         for (;;) {
 176                 c = *fmt++;
 177                 if (c == 0)
 178                         return nassigned;
 179                 if (iswspace(c)) {
 180                         while ((c = __fgetwc_unlock(fp)) != WEOF &&
 181                             iswspace(c))
 182                                 ;
 183                         if (c != WEOF)
 184                                 ungetwc(c, fp);
 185                         continue;
 186                 }
 187                 if (c != '%')
 188                         goto literal;
 189                 width = 0;
 190                 flags = 0;
 191                 /*
 192                  * switch on the format.  continue if done;
 193                  * break once format type is derived.
 194                  */
 195 again:          c = *fmt++;
 196                 switch (c) {
 197                 case '%':
 198                         SCANF_SKIP_SPACE();
 199 literal:
 200                         if ((wi = __fgetwc_unlock(fp)) == WEOF)
 201                                 goto input_failure;
 202                         if (wi != c) {
 203                                 ungetwc(wi, fp);
 204                                 goto input_failure;
 205                         }
 206                         nread++;
 207                         continue;
 208
 209                 case '*':
 210                         flags |= SUPPRESS;
 211                         goto again;
 212                 case 'j':
 213                         flags |= INTMAXT;
 214                         goto again;
 215                 case 'l':
 216                         if (flags & LONG) {
 217                                 flags &= ~LONG;
 218                                 flags |= LONGLONG;
 219                         } else
 220                                 flags |= LONG;
 221                         goto again;
 222                 case 'q':
 223                         flags |= LONGLONG;      /* not quite */
 224                         goto again;
 225                 case 't':
 226                         flags |= PTRDIFFT;
 227                         goto again;
 228                 case 'z':
 229                         flags |= SIZET;
 230                         goto again;
 231                 case 'L':
 232                         flags |= LONGDBL;
 233                         goto again;
 234                 case 'h':
 235                         if (flags & SHORT) {
 236                                 flags &= ~SHORT;
 237                                 flags |= SHORTSHORT;
 238                         } else
 239                                 flags |= SHORT;
 240                         goto again;
 241
 242                 case '0': case '1': case '2': case '3': case '4':
 243                 case '5': case '6': case '7': case '8': case '9':
 244                         width = width * 10 + c - '0';
 245                         goto again;
 246
 247                 /*
 248                  * Conversions.
 249                  */
 250                 case 'd':
 251                         c = CT_INT;
 252                         base = 10;
 253                         break;
 254
 255                 case 'i':
 256                         c = CT_INT;
 257                         base = 0;
 258                         break;
 259
 260                 case 'o':
 261                         c = CT_INT;
 262                         flags |= UNSIGNED;
 263                         base = 8;
 264                         break;
 265
 266                 case 'u':
 267                         c = CT_INT;
 268                         flags |= UNSIGNED;
 269                         base = 10;
 270                         break;
 271
 272                 case 'X':
 273                 case 'x':
 274                         flags |= PFXOK; /* enable 0x prefixing */
 275                         c = CT_INT;
 276                         flags |= UNSIGNED;
 277                         base = 16;
 278                         break;
 279
 280 #ifndef NO_FLOATING_POINT
 281                 case 'A': case 'E': case 'F': case 'G':
 282                 case 'a': case 'e': case 'f': case 'g':
 283                         c = CT_FLOAT;
 284                         break;
 285 #endif
 286
 287                 case 'S':
 288                         flags |= LONG;
 289                         /* FALLTHROUGH */
 290                 case 's':
 291                         c = CT_STRING;
 292                         break;
 293
 294                 case '[':
 295                         ccls = fmt;
 296                         if (*fmt == '^') {
 297                                 cclcompl = 1;
 298                                 fmt++;
 299                         } else
 300                                 cclcompl = 0;
 301                         if (*fmt == ']')
 302                                 fmt++;
 303                         while (*fmt != '\0' && *fmt != ']')
 304                                 fmt++;
 305                         ccle = fmt;
 306                         fmt++;
 307                         flags |= NOSKIP;
 308                         c = CT_CCL;
 309                         break;
 310
 311                 case 'C':
 312                         flags |= LONG;
 313                         /* FALLTHROUGH */
 314                 case 'c':
 315                         flags |= NOSKIP;
 316                         c = CT_CHAR;
 317                         break;
 318
 319                 case 'p':       /* pointer format is like hex */
 320                         flags |= POINTER | PFXOK;
 321                         c = CT_INT;             /* assumes sizeof(uintmax_t) */
 322                         flags |= UNSIGNED;      /*      >= sizeof(uintptr_t) */
 323                         base = 16;
 324                         break;
 325
 326                 case 'n':
 327                         nconversions++;
 328                         if (flags & SUPPRESS)   /* ??? */
 329                                 continue;
 330                         if (flags & SHORTSHORT)
 331                                 *va_arg(ap, char *) = (char)nread;
 332                         else if (flags & SHORT)
 333                                 *va_arg(ap, short *) = (short)nread;
 334                         else if (flags & LONG)
 335                                 *va_arg(ap, long *) = nread;
 336                         else if (flags & LONGLONG)
 337                                 *va_arg(ap, quad_t *) = nread;
 338                         else if (flags & INTMAXT)
 339                                 *va_arg(ap, intmax_t *) = nread;
 340                         else if (flags & SIZET)
 341                                 *va_arg(ap, size_t *) = nread;
 342                         else if (flags & PTRDIFFT)
 343                                 *va_arg(ap, ptrdiff_t *) = nread;
 344                         else
 345                                 *va_arg(ap, int *) = (int)nread;
 346                         continue;
 347
 348                 default:
 349                         goto match_failure;
 350
 351                 /*
 352                  * Disgusting backwards compatibility hack.     XXX
 353                  */
 354                 case '\0':      /* compat */
 355                         return EOF;
 356                 }
 357
 358                 /*
 359                  * Consume leading white space, except for formats
 360                  * that suppress this.
 361                  */
 362                 if ((flags & NOSKIP) == 0) {
 363                         while ((wi = __fgetwc_unlock(fp)) != WEOF && iswspace(wi))
 364                                 nread++;
 365                         if (wi == WEOF)
 366                                 goto input_failure;
 367                         ungetwc(wi, fp);
 368                 }
 369
 370                 /*
 371                  * Do the conversion.
 372                  */
 373                 switch (c) {
 374
 375                 case CT_CHAR:
 376                         /* scan arbitrary characters (sets NOSKIP) */
 377                         if (width == 0)
 378                                 width = 1;
 379                         if (flags & LONG) {
 380                                 if (!(flags & SUPPRESS))
 381                                         p = va_arg(ap, wchar_t *);
 382                                 n = 0;
 383                                 while (width-- != 0 &&
 384                                     (wi = __fgetwc_unlock(fp)) != WEOF) {
 385                                         if (!(flags & SUPPRESS))
 386                                                 *p++ = (wchar_t)wi;
 387                                         n++;
 388                                 }
 389                                 if (n == 0)
 390                                         goto input_failure;
 391                                 nread += n;
 392                                 if (!(flags & SUPPRESS))
 393                                         nassigned++;
 394                         } else {
 395                                 if (!(flags & SUPPRESS))
 396                                         mbp = va_arg(ap, char *);
 397                                 n = 0;
 398                                 mbs = initial;
 399                                 while (width != 0 &&
 400                                     (wi = __fgetwc_unlock(fp)) != WEOF) {
 401                                         if (width >= MB_CUR_MAX &&
 402                                             !(flags & SUPPRESS)) {
 403                                                 nconv = wcrtomb(mbp, wi, &mbs);
 404                                                 if (nconv == (size_t)-1)
 405                                                         goto input_failure;
 406                                         } else {
 407                                                 nconv = wcrtomb(mbbuf, wi,
 408                                                     &mbs);
 409                                                 if (nconv == (size_t)-1)
 410                                                         goto input_failure;
 411                                                 if (nconv > width) {
 412                                                         ungetwc(wi, fp);
 413                                                         break;
 414                                                 }
 415                                                 if (!(flags & SUPPRESS))
 416                                                         memcpy(mbp, mbbuf,
 417                                                             nconv);
 418                                         }
 419                                         if (!(flags & SUPPRESS))
 420                                                 mbp += nconv;
 421                                         width -= nconv;
 422                                         n++;
 423                                 }
 424                                 if (n == 0)
 425                                         goto input_failure;
 426                                 nread += n;
 427                                 if (!(flags & SUPPRESS))
 428                                         nassigned++;
 429                         }
 430                         nconversions++;
 431                         break;
 432
 433                 case CT_CCL:
 434                         /* scan a (nonempty) character class (sets NOSKIP) */
 435                         if (width == 0)
 436                                 width = (size_t)~0;     /* `infinity' */
 437                         /* take only those things in the class */
 438                         if ((flags & SUPPRESS) && (flags & LONG)) {
 439                                 n = 0;
 440                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 441                                     width-- != 0 && INCCL(wi))
 442                                         n++;
 443                                 if (wi != WEOF)
 444                                         ungetwc(wi, fp);
 445                                 if (n == 0)
 446                                         goto match_failure;
 447                         } else if (flags & LONG) {
 448                                 p0 = p = va_arg(ap, wchar_t *);
 449                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 450                                     width-- != 0 && INCCL(wi))
 451                                         *p++ = (wchar_t)wi;
 452                                 if (wi != WEOF)
 453                                         ungetwc(wi, fp);
 454                                 _DIAGASSERT(__type_fit(int, p - p0));
 455                                 n = (int)(p - p0);
 456                                 if (n == 0)
 457                                         goto match_failure;
 458                                 *p = 0;
 459                                 nassigned++;
 460                         } else {
 461                                 if (!(flags & SUPPRESS))
 462                                         mbp = va_arg(ap, char *);
 463                                 n = 0;
 464                                 mbs = initial;
 465                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 466                                     width != 0 && INCCL(wi)) {
 467                                         if (width >= MB_CUR_MAX &&
 468                                            !(flags & SUPPRESS)) {
 469                                                 nconv = wcrtomb(mbp, wi, &mbs);
 470                                                 if (nconv == (size_t)-1)
 471                                                         goto input_failure;
 472                                         } else {
 473                                                 nconv = wcrtomb(mbbuf, wi,
 474                                                     &mbs);
 475                                                 if (nconv == (size_t)-1)
 476                                                         goto input_failure;
 477                                                 if (nconv > width)
 478                                                         break;
 479                                                 if (!(flags & SUPPRESS))
 480                                                         memcpy(mbp, mbbuf,
 481                                                             nconv);
 482                                         }
 483                                         if (!(flags & SUPPRESS))
 484                                                 mbp += nconv;
 485                                         width -= nconv;
 486                                         n++;
 487                                 }
 488                                 if (wi != WEOF)
 489                                         ungetwc(wi, fp);
 490                                 if (!(flags & SUPPRESS)) {
 491                                         *mbp = 0;
 492                                         nassigned++;
 493                                 }
 494                         }
 495                         nread += n;
 496                         nconversions++;
 497                         break;
 498
 499                 case CT_STRING:
 500                         /* like CCL, but zero-length string OK, & no NOSKIP */
 501                         if (width == 0)
 502                                 width = (size_t)~0;
 503                         if ((flags & SUPPRESS) && (flags & LONG)) {
 504                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 505                                     width-- != 0 &&
 506                                     !iswspace(wi))
 507                                         nread++;
 508                                 if (wi != WEOF)
 509                                         ungetwc(wi, fp);
 510                         } else if (flags & LONG) {
 511                                 p0 = p = va_arg(ap, wchar_t *);
 512                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 513                                     width-- != 0 &&
 514                                     !iswspace(wi)) {
 515                                         *p++ = (wchar_t)wi;
 516                                         nread++;
 517                                 }
 518                                 if (wi != WEOF)
 519                                         ungetwc(wi, fp);
 520                                 *p = '\0';
 521                                 nassigned++;
 522                         } else {
 523                                 if (!(flags & SUPPRESS))
 524                                         mbp = va_arg(ap, char *);
 525                                 mbs = initial;
 526                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 527                                     width != 0 &&
 528                                     !iswspace(wi)) {
 529                                         if (width >= MB_CUR_MAX &&
 530                                             !(flags & SUPPRESS)) {
 531                                                 nconv = wcrtomb(mbp, wi, &mbs);
 532                                                 if (nconv == (size_t)-1)
 533                                                         goto input_failure;
 534                                         } else {
 535                                                 nconv = wcrtomb(mbbuf, wi,
 536                                                     &mbs);
 537                                                 if (nconv == (size_t)-1)
 538                                                         goto input_failure;
 539                                                 if (nconv > width)
 540                                                         break;
 541                                                 if (!(flags & SUPPRESS))
 542                                                         memcpy(mbp, mbbuf,
 543                                                             nconv);
 544                                         }
 545                                         if (!(flags & SUPPRESS))
 546                                                 mbp += nconv;
 547                                         width -= nconv;
 548                                         nread++;
 549                                 }
 550                                 if (wi != WEOF)
 551                                         ungetwc(wi, fp);
 552                                 if (!(flags & SUPPRESS)) {
 553                                         *mbp = 0;
 554                                         nassigned++;
 555                                 }
 556                         }
 557                         nconversions++;
 558                         continue;
 559
 560                 case CT_INT:
 561                         /* scan an integer as if by the conversion function */
 562                         if (width == 0 || width > sizeof(buf) /
 563                             sizeof(*buf) - 1)
 564                                 width = sizeof(buf) / sizeof(*buf) - 1;
 565                         flags |= SIGNOK | NDIGITS | NZDIGITS;
 566                         for (p = buf; width; width--) {
 567                                 c = __fgetwc_unlock(fp);
 568                                 /*
 569                                  * Switch on the character; `goto ok'
 570                                  * if we accept it as a part of number.
 571                                  */
 572                                 switch (c) {
 573
 574                                 /*
 575                                  * The digit 0 is always legal, but is
 576                                  * special.  For %i conversions, if no
 577                                  * digits (zero or nonzero) have been
 578                                  * scanned (only signs), we will have
 579                                  * base==0.  In that case, we should set
 580                                  * it to 8 and enable 0x prefixing.
 581                                  * Also, if we have not scanned zero digits
 582                                  * before this, do not turn off prefixing
 583                                  * (someone else will turn it off if we
 584                                  * have scanned any nonzero digits).
 585                                  */
 586                                 case '0':
 587                                         if (base == 0) {
 588                                                 base = 8;
 589                                                 flags |= PFXOK;
 590                                         }
 591                                         if (flags & NZDIGITS)
 592                                             flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
 593                                         else
 594                                             flags &= ~(SIGNOK|PFXOK|NDIGITS);
 595                                         goto ok;
 596
 597                                 /* 1 through 7 always legal */
 598                                 case '1': case '2': case '3':
 599                                 case '4': case '5': case '6': case '7':
 600                                         base = basefix[base];
 601                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 602                                         goto ok;
 603
 604                                 /* digits 8 and 9 ok iff decimal or hex */
 605                                 case '8': case '9':
 606                                         base = basefix[base];
 607                                         if (base <= 8)
 608                                                 break;  /* not legal here */
 609                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 610                                         goto ok;
 611
 612                                 /* letters ok iff hex */
 613                                 case 'A': case 'B': case 'C':
 614                                 case 'D': case 'E': case 'F':
 615                                 case 'a': case 'b': case 'c':
 616                                 case 'd': case 'e': case 'f':
 617                                         /* no need to fix base here */
 618                                         if (base <= 10)
 619                                                 break;  /* not legal here */
 620                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 621                                         goto ok;
 622
 623                                 /* sign ok only as first character */
 624                                 case '+': case '-':
 625                                         if (flags & SIGNOK) {
 626                                                 flags &= ~SIGNOK;
 627                                                 flags |= HAVESIGN;
 628                                                 goto ok;
 629                                         }
 630                                         break;
 631
 632                                 /*
 633                                  * x ok iff flag still set & 2nd char (or
 634                                  * 3rd char if we have a sign).
 635                                  */
 636                                 case 'x': case 'X':
 637                                         if (flags & PFXOK && p ==
 638                                             buf + 1 + !!(flags & HAVESIGN)) {
 639                                                 base = 16;      /* if %i */
 640                                                 flags &= ~PFXOK;
 641                                                 goto ok;
 642                                         }
 643                                         break;
 644                                 }
 645
 646                                 /*
 647                                  * If we got here, c is not a legal character
 648                                  * for a number.  Stop accumulating digits.
 649                                  */
 650                                 if (c != WEOF)
 651                                         ungetwc(c, fp);
 652                                 break;
 653                 ok:
 654                                 /*
 655                                  * c is legal: store it and look at the next.
 656                                  */
 657                                 *p++ = (wchar_t)c;
 658                         }
 659                         /*
 660                          * If we had only a sign, it is no good; push
 661                          * back the sign.  If the number ends in `x',
 662                          * it was [sign] '0' 'x', so push back the x
 663                          * and treat it as [sign] '0'.
 664                          */
 665                         if (flags & NDIGITS) {
 666                                 if (p > buf)
 667                                         ungetwc(*--p, fp);
 668                                 goto match_failure;
 669                         }
 670                         c = p[-1];
 671                         if (c == 'x' || c == 'X') {
 672                                 --p;
 673                                 ungetwc(c, fp);
 674                         }
 675                         if ((flags & SUPPRESS) == 0) {
 676                                 uintmax_t res;
 677
 678                                 *p = 0;
 679                                 if ((flags & UNSIGNED) == 0)
 680                                     res = wcstoimax(buf, NULL, base);
 681                                 else
 682                                     res = wcstoumax(buf, NULL, base);
 683                                 if (flags & POINTER)
 684                                         *va_arg(ap, void **) =
 685                                                         (void *)(uintptr_t)res;
 686                                 else if (flags & SHORTSHORT)
 687                                         *va_arg(ap, char *) = (char)res;
 688                                 else if (flags & SHORT)
 689                                         *va_arg(ap, short *) = (short)res;
 690                                 else if (flags & LONG)
 691                                         *va_arg(ap, long *) = (long)res;
 692                                 else if (flags & LONGLONG)
 693                                         *va_arg(ap, quad_t *) = res;
 694                                 else if (flags & INTMAXT)
 695                                         *va_arg(ap, intmax_t *) = res;
 696                                 else if (flags & PTRDIFFT)
 697                                         *va_arg(ap, ptrdiff_t *) = (ptrdiff_t)res;
 698                                 else if (flags & SIZET)
 699                                         *va_arg(ap, size_t *) = (size_t)res;
 700                                 else
 701                                         *va_arg(ap, int *) = (int)res;
 702                                 nassigned++;
 703                         }
 704                         _DIAGASSERT(__type_fit(int, p - buf));
 705                         nread += (int)(p - buf);
 706                         nconversions++;
 707                         break;
 708
 709 #ifndef NO_FLOATING_POINT
 710                 case CT_FLOAT:
 711                         /* scan a floating point number as if by strtod */
 712                         if (width == 0 || width > sizeof(buf) /
 713                             sizeof(*buf) - 1)
 714                                 width = sizeof(buf) / sizeof(*buf) - 1;
 715                         if ((width = parsefloat(fp, buf, buf + width)) == 0)
 716                                 goto match_failure;
 717                         if ((flags & SUPPRESS) == 0) {
 718                                 if (flags & LONGDBL) {
 719                                         long double res = wcstold(buf, &p);
 720                                         *va_arg(ap, long double *) = res;
 721                                 } else
 722                                 if (flags & LONG) {
 723                                         double res = wcstod(buf, &p);
 724                                         *va_arg(ap, double *) = res;
 725                                 } else {
 726                                         float res = wcstof(buf, &p);
 727                                         *va_arg(ap, float *) = res;
 728                                 }
 729 #ifdef DEBUG
 730                                 if (p - buf != (ptrdiff_t)width)
 731                                         abort();
 732 #endif
 733                                 nassigned++;
 734                         }
 735                         nread += width;
 736                         nconversions++;
 737                         break;
 738 #endif /* !NO_FLOATING_POINT */
 739                 }
 740         }
 741 input_failure:
 742         return nconversions != 0 ? nassigned : EOF;
 743 match_failure:
 744         return nassigned;
 745 }
 746
 747 #ifndef NO_FLOATING_POINT
 748 static int
 749 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end)
 750 {
 751         wchar_t *commit, *p;
 752         int infnanpos = 0;
 753         enum {
 754                 S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX,
 755                 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
 756         } state = S_START;
 757         wchar_t c;
 758         wchar_t decpt = (wchar_t)(unsigned char)*localeconv()->decimal_point;
 759         int gotmantdig = 0, ishex = 0;
 760
 761         /*
 762          * We set commit = p whenever the string we have read so far
 763          * constitutes a valid representation of a floating point
 764          * number by itself.  At some point, the parse will complete
 765          * or fail, and we will ungetc() back to the last commit point.
 766          * To ensure that the file offset gets updated properly, it is
 767          * always necessary to read at least one character that doesn't
 768          * match; thus, we can't short-circuit "infinity" or "nan(...)".
 769          */
 770         commit = buf - 1;
 771         c = WEOF;
 772         for (p = buf; p < end; ) {
 773                 if ((c = __fgetwc_unlock(fp)) == WEOF)
 774                         break;
 775 reswitch:
 776                 switch (state) {
 777                 case S_START:
 778                         state = S_GOTSIGN;
 779                         if (c == '-' || c == '+')
 780                                 break;
 781                         else
 782                                 goto reswitch;
 783                 case S_GOTSIGN:
 784                         switch (c) {
 785                         case '0':
 786                                 state = S_MAYBEHEX;
 787                                 commit = p;
 788                                 break;
 789                         case 'I':
 790                         case 'i':
 791                                 state = S_INF;
 792                                 break;
 793                         case 'N':
 794                         case 'n':
 795                                 state = S_NAN;
 796                                 break;
 797                         default:
 798                                 state = S_DIGITS;
 799                                 goto reswitch;
 800                         }
 801                         break;
 802                 case S_INF:
 803                         if (infnanpos > 6 ||
 804                             (c != "nfinity"[infnanpos] &&
 805                              c != "NFINITY"[infnanpos]))
 806                                 goto parsedone;
 807                         if (infnanpos == 1 || infnanpos == 6)
 808                                 commit = p;     /* inf or infinity */
 809                         infnanpos++;
 810                         break;
 811                 case S_NAN:
 812                         switch (infnanpos) {
 813                         case -1:        /* XXX kludge to deal with nan(...) */
 814                                 goto parsedone;
 815                         case 0:
 816                                 if (c != 'A' && c != 'a')
 817                                         goto parsedone;
 818                                 break;
 819                         case 1:
 820                                 if (c != 'N' && c != 'n')
 821                                         goto parsedone;
 822                                 else
 823                                         commit = p;
 824                                 break;
 825                         case 2:
 826                                 if (c != '(')
 827                                         goto parsedone;
 828                                 break;
 829                         default:
 830                                 if (c == ')') {
 831                                         commit = p;
 832                                         infnanpos = -2;
 833                                 } else if (!iswalnum(c) && c != '_')
 834                                         goto parsedone;
 835                                 break;
 836                         }
 837                         infnanpos++;
 838                         break;
 839                 case S_MAYBEHEX:
 840                         state = S_DIGITS;
 841                         if (c == 'X' || c == 'x') {
 842                                 ishex = 1;
 843                                 break;
 844                         } else {        /* we saw a '0', but no 'x' */
 845                                 gotmantdig = 1;
 846                                 goto reswitch;
 847                         }
 848                 case S_DIGITS:
 849                         if ((ishex && iswxdigit(c)) || iswdigit(c))
 850                                 gotmantdig = 1;
 851                         else {
 852                                 state = S_FRAC;
 853                                 if (c != decpt)
 854                                         goto reswitch;
 855                         }
 856                         if (gotmantdig)
 857                                 commit = p;
 858                         break;
 859                 case S_FRAC:
 860                         if (((c == 'E' || c == 'e') && !ishex) ||
 861                             ((c == 'P' || c == 'p') && ishex)) {
 862                                 if (!gotmantdig)
 863                                         goto parsedone;
 864                                 else
 865                                         state = S_EXP;
 866                         } else if ((ishex && iswxdigit(c)) || iswdigit(c)) {
 867                                 commit = p;
 868                                 gotmantdig = 1;
 869                         } else
 870                                 goto parsedone;
 871                         break;
 872                 case S_EXP:
 873                         state = S_EXPDIGITS;
 874                         if (c == '-' || c == '+')
 875                                 break;
 876                         else
 877                                 goto reswitch;
 878                 case S_EXPDIGITS:
 879                         if (iswdigit(c))
 880                                 commit = p;
 881                         else
 882                                 goto parsedone;
 883                         break;
 884                 default:
 885                         abort();
 886                 }
 887                 *p++ = c;
 888                 c = WEOF;
 889         }
 890
 891 parsedone:
 892         if (c != WEOF)
 893                 ungetwc(c, fp);
 894         while (commit < --p)
 895                 ungetwc(*p, fp);
 896         *++commit = '\0';
 897         _DIAGASSERT(__type_fit(int, commit - buf));
 898         return (int)(commit - buf);
 899 }
 900 #endif