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  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #if 0
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)vfscanf.c   8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #endif
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD: src/lib/libc/stdio/vfwscanf.c,v 1.17 2009/01/19 06:19:51 das Exp $");
  40
  41 #include "xlocale_private.h"
  42
  43 #include "namespace.h"
  44 #include <ctype.h>
  45 #include <inttypes.h>
  46 #include <limits.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <stddef.h>
  50 #include <stdarg.h>
  51 #include <string.h>
  52 #include <wchar.h>
  53 #include <wctype.h>
  54 #include "un-namespace.h"
  55
  56 #include "libc_private.h"
  57 #include "local.h"
  58
  59 #ifndef NO_FLOATING_POINT
  60 #include <locale.h>
  61 #endif
  62
  63 #define BUF             513     /* Maximum length of numeric string. */
  64
  65 /*
  66  * Flags used during conversion.
  67  */
  68 #define LONG            0x01    /* l: long or double */
  69 #define LONGDBL         0x02    /* L: long double */
  70 #define SHORT           0x04    /* h: short */
  71 #define SUPPRESS        0x08    /* *: suppress assignment */
  72 #define POINTER         0x10    /* p: void * (as hex) */
  73 #define NOSKIP          0x20    /* [ or c: do not skip blanks */
  74 #define LONGLONG        0x400   /* ll: long long (+ deprecated q: quad) */
  75 #define INTMAXT         0x800   /* j: intmax_t */
  76 #define PTRDIFFT        0x1000  /* t: ptrdiff_t */
  77 #define SIZET           0x2000  /* z: size_t */
  78 #define SHORTSHORT      0x4000  /* hh: char */
  79 #define UNSIGNED        0x8000  /* %[oupxX] conversions */
  80
  81 /*
  82  * The following are used in integral conversions only:
  83  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
  84  */
  85 #define SIGNOK          0x40    /* +/- is (still) legal */
  86 #define NDIGITS         0x80    /* no digits detected */
  87 #define PFXOK           0x100   /* 0x prefix is (still) legal */
  88 #define NZDIGITS        0x200   /* no zero digits detected */
  89 #define HAVESIGN        0x10000 /* sign detected */
  90
  91 /*
  92  * Conversion types.
  93  */
  94 #define CT_CHAR         0       /* %c conversion */
  95 #define CT_CCL          1       /* %[...] conversion */
  96 #define CT_STRING       2       /* %s conversion */
  97 #define CT_INT          3       /* %[dioupxX] conversion */
  98 #define CT_FLOAT        4       /* %[efgEFG] conversion */
  99
 100 #ifndef NO_FLOATING_POINT
 101 static int parsefloat(FILE *, wchar_t **, size_t, locale_t loc);
 102 #endif
 103
 104 #define INCCL(_c)       \
 105         (cclcompl ? (wmemchr(ccls, (_c), ccle - ccls) == NULL) : \
 106         (wmemchr(ccls, (_c), ccle - ccls) != NULL))
 107
 108 static const mbstate_t initial_mbs;
 109
 110 /*
 111  * MT-safe version.
 112  */
 113 int
 114 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 115 {
 116         int ret;
 117
 118         FLOCKFILE(fp);
 119         ORIENT(fp, 1);
 120         ret = __vfwscanf(fp, __current_locale(), fmt, ap);
 121         FUNLOCKFILE(fp);
 122         return (ret);
 123 }
 124
 125 int
 126 vfwscanf_l(FILE * __restrict fp, locale_t loc, const wchar_t * __restrict fmt,
 127     va_list ap)
 128 {
 129         int ret;
 130
 131         NORMALIZE_LOCALE(loc);
 132         FLOCKFILE(fp);
 133         ORIENT(fp, 1);
 134         ret = __vfwscanf(fp, loc, fmt, ap);
 135         FUNLOCKFILE(fp);
 136         return (ret);
 137 }
 138
 139 /*
 140  * Non-MT-safe version.
 141  */
 142 __private_extern__ int
 143 __vfwscanf(FILE * __restrict fp, locale_t loc, const wchar_t * __restrict fmt,
 144     va_list ap)
 145 {
 146         wint_t c;               /* character from format, or conversion */
 147         size_t width;           /* field width, or 0 */
 148         wchar_t *p;             /* points into all kinds of strings */
 149         int n;                  /* handy integer */
 150         int flags;              /* flags as defined above */
 151         wchar_t *p0;            /* saves original value of p when necessary */
 152         int nassigned;          /* number of fields assigned */
 153         int nread;              /* number of characters consumed from fp */
 154         int base;               /* base argument to conversion function */
 155         wchar_t buf[BUF];       /* buffer for numeric conversions */
 156         const wchar_t *ccls;    /* character class start */
 157         const wchar_t *ccle;    /* character class end */
 158         int cclcompl;           /* ccl is complemented? */
 159         wint_t wi;              /* handy wint_t */
 160         char *mbp;              /* multibyte string pointer for %c %s %[ */
 161         size_t nconv;           /* number of bytes in mb. conversion */
 162         char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */
 163         int index;              /* for %index$ */
 164         va_list ap_orig;        /* to reset ap to first argument */
 165         mbstate_t mbs;
 166         int mb_cur_max = MB_CUR_MAX_L(loc);
 167
 168         /* `basefix' is used to avoid `if' tests in the integer scanner */
 169         static const short basefix[17] =
 170                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
 171
 172         nassigned = 0;
 173         nread = 0;
 174         ccls = ccle = NULL;
 175         va_copy(ap_orig, ap);
 176         for (;;) {
 177                 c = *fmt++;
 178                 if (c == 0)
 179                         return (nassigned);
 180                 if (iswspace_l(c, loc)) {
 181                         while ((c = __fgetwc(fp, loc)) != WEOF &&
 182                             iswspace_l(c, loc))
 183                                 ;
 184                         if (c != WEOF)
 185                                 __ungetwc(c, fp, loc);
 186                         continue;
 187                 }
 188                 if (c != '%') {
 189                         if ((wi = __fgetwc(fp, loc)) == WEOF)
 190                                 goto input_failure;
 191                         goto literal;
 192                 }
 193                 width = 0;
 194                 flags = 0;
 195                 /*
 196                  * switch on the format.  continue if done;
 197                  * break once format type is derived.
 198                  */
 199 again:          c = *fmt++;
 200                 switch (c) {
 201                 case '%':
 202                 /* Consume leading white space */
 203                         for(;;) {
 204                                 if ((wi = __fgetwc(fp, loc)) == WEOF)
 205                                         goto input_failure;
 206                                 if (!iswspace_l(wi, loc))
 207                                         break;
 208                                 nread++;
 209                         }
 210 literal:
 211                         if (wi != c) {
 212                                 __ungetwc(wi, fp, loc);
 213                                 goto match_failure;
 214                         }
 215                         nread++;
 216                         continue;
 217
 218                 case '$':
 219                         index = width;
 220                         if (index < 1 || index > NL_ARGMAX || fmt[-3] != '%') {
 221                                 goto input_failure;
 222                         }
 223                         width = 0;
 224                         va_end(ap);
 225                         va_copy(ap, ap_orig); /* reset to %1$ */
 226                         for (; index > 1; index--) {
 227                                 va_arg(ap, void*);
 228                         }
 229                         goto again;
 230                 case '*':
 231                         flags |= SUPPRESS;
 232                         goto again;
 233                 case 'j':
 234                         flags |= INTMAXT;
 235                         goto again;
 236                 case 'l':
 237                         if (flags & LONG) {
 238                                 flags &= ~LONG;
 239                                 flags |= LONGLONG;
 240                         } else
 241                                 flags |= LONG;
 242                         goto again;
 243                 case 'q':
 244                         flags |= LONGLONG;      /* not quite */
 245                         goto again;
 246                 case 't':
 247                         flags |= PTRDIFFT;
 248                         goto again;
 249                 case 'z':
 250                         flags |= SIZET;
 251                         goto again;
 252                 case 'L':
 253                         flags |= LONGDBL;
 254                         goto again;
 255                 case 'h':
 256                         if (flags & SHORT) {
 257                                 flags &= ~SHORT;
 258                                 flags |= SHORTSHORT;
 259                         } else
 260                                 flags |= SHORT;
 261                         goto again;
 262
 263                 case '0': case '1': case '2': case '3': case '4':
 264                 case '5': case '6': case '7': case '8': case '9':
 265                         width = width * 10 + c - '0';
 266                         goto again;
 267
 268                 /*
 269                  * Conversions.
 270                  */
 271                 case 'd':
 272                         c = CT_INT;
 273                         base = 10;
 274                         break;
 275
 276                 case 'i':
 277                         c = CT_INT;
 278                         base = 0;
 279                         break;
 280
 281                 case 'o':
 282                         c = CT_INT;
 283                         flags |= UNSIGNED;
 284                         base = 8;
 285                         break;
 286
 287                 case 'u':
 288                         c = CT_INT;
 289                         flags |= UNSIGNED;
 290                         base = 10;
 291                         break;
 292
 293                 case 'X':
 294                 case 'x':
 295                         flags |= PFXOK; /* enable 0x prefixing */
 296                         c = CT_INT;
 297                         flags |= UNSIGNED;
 298                         base = 16;
 299                         break;
 300
 301 #ifndef NO_FLOATING_POINT
 302                 case 'A': case 'E': case 'F': case 'G':
 303                 case 'a': case 'e': case 'f': case 'g':
 304                         c = CT_FLOAT;
 305                         break;
 306 #endif
 307
 308                 case 'S':
 309                         flags |= LONG;
 310                         /* FALLTHROUGH */
 311                 case 's':
 312                         c = CT_STRING;
 313                         break;
 314
 315                 case '[':
 316                         ccls = fmt;
 317                         if (*fmt == '^') {
 318                                 cclcompl = 1;
 319                                 fmt++;
 320                         } else
 321                                 cclcompl = 0;
 322                         if (*fmt == ']')
 323                                 fmt++;
 324                         while (*fmt != '\0' && *fmt != ']')
 325                                 fmt++;
 326                         ccle = fmt;
 327                         fmt++;
 328                         flags |= NOSKIP;
 329                         c = CT_CCL;
 330                         break;
 331
 332                 case 'C':
 333                         flags |= LONG;
 334                         /* FALLTHROUGH */
 335                 case 'c':
 336                         flags |= NOSKIP;
 337                         c = CT_CHAR;
 338                         break;
 339
 340                 case 'p':       /* pointer format is like hex */
 341                         flags |= POINTER | PFXOK;
 342                         c = CT_INT;             /* assumes sizeof(uintmax_t) */
 343                         flags |= UNSIGNED;      /*      >= sizeof(uintptr_t) */
 344                         base = 16;
 345                         break;
 346
 347                 case 'n':
 348                 {
 349                         if (flags & SUPPRESS)   /* ??? */
 350                                 continue;
 351                         void *ptr = va_arg(ap, void *);
 352                         if (ptr == NULL)
 353                                 continue;
 354                         else if (flags & SHORTSHORT)
 355                                 *(char *)ptr = nread;
 356                         else if (flags & SHORT)
 357                                 *(short *)ptr = nread;
 358                         else if (flags & LONG)
 359                                 *(long *)ptr = nread;
 360                         else if (flags & LONGLONG)
 361                                 *(long long *)ptr = nread;
 362                         else if (flags & INTMAXT)
 363                                 *(intmax_t *)ptr = nread;
 364                         else if (flags & SIZET)
 365                                 *(size_t *)ptr = nread;
 366                         else if (flags & PTRDIFFT)
 367                                 *(ptrdiff_t *)ptr = nread;
 368                         else
 369                                 *(int *)ptr = nread;
 370                         continue;
 371                 }
 372                 default:
 373                         goto match_failure;
 374
 375                 /*
 376                  * Disgusting backwards compatibility hack.     XXX
 377                  */
 378                 case '\0':      /* compat */
 379                         return (EOF);
 380                 }
 381
 382                 /*
 383                  * Consume leading white space, except for formats
 384                  * that suppress this.
 385                  */
 386                 if ((flags & NOSKIP) == 0) {
 387                         while ((wi = __fgetwc(fp, loc)) != WEOF && iswspace_l(wi, loc))
 388                                 nread++;
 389                         if (wi == WEOF)
 390                                 goto input_failure;
 391                         __ungetwc(wi, fp, loc);
 392                 }
 393
 394                 /*
 395                  * Do the conversion.
 396                  */
 397                 switch (c) {
 398
 399                 case CT_CHAR:
 400                         /* scan arbitrary characters (sets NOSKIP) */
 401                         if (width == 0)
 402                                 width = 1;
 403                         if (flags & LONG) {
 404                                 if (!(flags & SUPPRESS))
 405                                         p = va_arg(ap, wchar_t *);
 406                                 n = 0;
 407                                 while (width-- != 0 &&
 408                                     (wi = __fgetwc(fp, loc)) != WEOF) {
 409                                         if (!(flags & SUPPRESS))
 410                                                 *p++ = (wchar_t)wi;
 411                                         n++;
 412                                 }
 413                                 if (n == 0)
 414                                         goto input_failure;
 415                                 nread += n;
 416                                 if (!(flags & SUPPRESS))
 417                                         nassigned++;
 418                         } else {
 419                                 if (!(flags & SUPPRESS))
 420                                         mbp = va_arg(ap, char *);
 421                                 n = 0;
 422                                 mbs = initial_mbs;
 423                                 while (width != 0 &&
 424                                     (wi = __fgetwc(fp, loc)) != WEOF) {
 425                                         if (width >= mb_cur_max &&
 426                                             !(flags & SUPPRESS)) {
 427                                                 nconv = wcrtomb_l(mbp, wi, &mbs, loc);
 428                                                 if (nconv == (size_t)-1)
 429                                                         goto input_failure;
 430                                         } else {
 431                                                 nconv = wcrtomb_l(mbbuf, wi,
 432                                                     &mbs, loc);
 433                                                 if (nconv == (size_t)-1)
 434                                                         goto input_failure;
 435                                                 if (nconv > width) {
 436                                                         __ungetwc(wi, fp, loc);
 437                                                         break;
 438                                                 }
 439                                                 if (!(flags & SUPPRESS))
 440                                                         memcpy(mbp, mbbuf,
 441                                                             nconv);
 442                                         }
 443                                         if (!(flags & SUPPRESS))
 444                                                 mbp += nconv;
 445                                         width -= nconv;
 446                                         n++;
 447                                 }
 448                                 if (n == 0)
 449                                         goto input_failure;
 450                                 nread += n;
 451                                 if (!(flags & SUPPRESS))
 452                                         nassigned++;
 453                         }
 454                         break;
 455
 456                 case CT_CCL:
 457                         /* scan a (nonempty) character class (sets NOSKIP) */
 458                         if (width == 0)
 459                                 width = (size_t)~0;     /* `infinity' */
 460                         /* take only those things in the class */
 461                         if ((flags & SUPPRESS) && (flags & LONG)) {
 462                                 n = 0;
 463                                 while ((wi = __fgetwc(fp, loc)) != WEOF &&
 464                                     width-- != 0 && INCCL(wi))
 465                                         n++;
 466                                 if (wi != WEOF)
 467                                         __ungetwc(wi, fp, loc);
 468                                 if (n == 0)
 469                                         goto match_failure;
 470                         } else if (flags & LONG) {
 471                                 p0 = p = va_arg(ap, wchar_t *);
 472                                 while ((wi = __fgetwc(fp, loc)) != WEOF &&
 473                                     width-- != 0 && INCCL(wi))
 474                                         *p++ = (wchar_t)wi;
 475                                 if (wi != WEOF)
 476                                         __ungetwc(wi, fp, loc);
 477                                 n = p - p0;
 478                                 if (n == 0)
 479                                         goto match_failure;
 480                                 *p = 0;
 481                                 nassigned++;
 482                         } else {
 483                                 if (!(flags & SUPPRESS))
 484                                         mbp = va_arg(ap, char *);
 485                                 n = 0;
 486                                 mbs = initial_mbs;
 487                                 while ((wi = __fgetwc(fp, loc)) != WEOF &&
 488                                     width != 0 && INCCL(wi)) {
 489                                         if (width >= mb_cur_max &&
 490                                            !(flags & SUPPRESS)) {
 491                                                 nconv = wcrtomb_l(mbp, wi, &mbs, loc);
 492                                                 if (nconv == (size_t)-1)
 493                                                         goto input_failure;
 494                                         } else {
 495                                                 nconv = wcrtomb_l(mbbuf, wi,
 496                                                     &mbs, loc);
 497                                                 if (nconv == (size_t)-1)
 498                                                         goto input_failure;
 499                                                 if (nconv > width)
 500                                                         break;
 501                                                 if (!(flags & SUPPRESS))
 502                                                         memcpy(mbp, mbbuf,
 503                                                             nconv);
 504                                         }
 505                                         if (!(flags & SUPPRESS))
 506                                                 mbp += nconv;
 507                                         width -= nconv;
 508                                         n++;
 509                                 }
 510                                 if (wi != WEOF)
 511                                         __ungetwc(wi, fp, loc);
 512                                 if (n == 0)
 513                                         goto match_failure;
 514                                 if (!(flags & SUPPRESS)) {
 515                                         *mbp = 0;
 516                                         nassigned++;
 517                                 }
 518                         }
 519                         nread += n;
 520                         break;
 521
 522                 case CT_STRING:
 523                         /* like CCL, but zero-length string OK, & no NOSKIP */
 524                         if (width == 0)
 525                                 width = (size_t)~0;
 526                         if ((flags & SUPPRESS) && (flags & LONG)) {
 527                                 while ((wi = __fgetwc(fp, loc)) != WEOF &&
 528                                     width-- != 0 &&
 529                                     !iswspace_l(wi, loc))
 530                                         nread++;
 531                                 if (wi != WEOF)
 532                                         __ungetwc(wi, fp, loc);
 533                         } else if (flags & LONG) {
 534                                 p0 = p = va_arg(ap, wchar_t *);
 535                                 while ((wi = __fgetwc(fp, loc)) != WEOF &&
 536                                     width-- != 0 &&
 537                                     !iswspace_l(wi, loc)) {
 538                                         *p++ = (wchar_t)wi;
 539                                         nread++;
 540                                 }
 541                                 if (wi != WEOF)
 542                                         __ungetwc(wi, fp, loc);
 543                                 *p = '\0';
 544                                 nassigned++;
 545                         } else {
 546                                 if (!(flags & SUPPRESS))
 547                                         mbp = va_arg(ap, char *);
 548                                 mbs = initial_mbs;
 549                                 while ((wi = __fgetwc(fp, loc)) != WEOF &&
 550                                     width != 0 &&
 551                                     !iswspace_l(wi, loc)) {
 552                                         if (width >= mb_cur_max &&
 553                                             !(flags & SUPPRESS)) {
 554                                                 nconv = wcrtomb_l(mbp, wi, &mbs, loc);
 555                                                 if (nconv == (size_t)-1)
 556                                                         goto input_failure;
 557                                         } else {
 558                                                 nconv = wcrtomb_l(mbbuf, wi,
 559                                                     &mbs, loc);
 560                                                 if (nconv == (size_t)-1)
 561                                                         goto input_failure;
 562                                                 if (nconv > width)
 563                                                         break;
 564                                                 if (!(flags & SUPPRESS))
 565                                                         memcpy(mbp, mbbuf,
 566                                                             nconv);
 567                                         }
 568                                         if (!(flags & SUPPRESS))
 569                                                 mbp += nconv;
 570                                         width -= nconv;
 571                                         nread++;
 572                                 }
 573                                 if (wi != WEOF)
 574                                         __ungetwc(wi, fp, loc);
 575                                 if (!(flags & SUPPRESS)) {
 576                                         *mbp = 0;
 577                                         nassigned++;
 578                                 }
 579                         }
 580                         continue;
 581
 582                 case CT_INT:
 583                         /* scan an integer as if by the conversion function */
 584                         if (width == 0 || width > sizeof(buf) /
 585                             sizeof(*buf) - 1)
 586                                 width = sizeof(buf) / sizeof(*buf) - 1;
 587                         flags |= SIGNOK | NDIGITS | NZDIGITS;
 588                         for (p = buf; width; width--) {
 589                                 c = __fgetwc(fp, loc);
 590                                 /*
 591                                  * Switch on the character; `goto ok'
 592                                  * if we accept it as a part of number.
 593                                  */
 594                                 switch (c) {
 595
 596                                 /*
 597                                  * The digit 0 is always legal, but is
 598                                  * special.  For %i conversions, if no
 599                                  * digits (zero or nonzero) have been
 600                                  * scanned (only signs), we will have
 601                                  * base==0.  In that case, we should set
 602                                  * it to 8 and enable 0x prefixing.
 603                                  * Also, if we have not scanned zero digits
 604                                  * before this, do not turn off prefixing
 605                                  * (someone else will turn it off if we
 606                                  * have scanned any nonzero digits).
 607                                  */
 608                                 case '0':
 609                                         if (base == 0) {
 610                                                 base = 8;
 611                                                 flags |= PFXOK;
 612                                         }
 613                                         if (flags & NZDIGITS)
 614                                             flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
 615                                         else
 616                                             flags &= ~(SIGNOK|PFXOK|NDIGITS);
 617                                         goto ok;
 618
 619                                 /* 1 through 7 always legal */
 620                                 case '1': case '2': case '3':
 621                                 case '4': case '5': case '6': case '7':
 622                                         base = basefix[base];
 623                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 624                                         goto ok;
 625
 626                                 /* digits 8 and 9 ok iff decimal or hex */
 627                                 case '8': case '9':
 628                                         base = basefix[base];
 629                                         if (base <= 8)
 630                                                 break;  /* not legal here */
 631                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 632                                         goto ok;
 633
 634                                 /* letters ok iff hex */
 635                                 case 'A': case 'B': case 'C':
 636                                 case 'D': case 'E': case 'F':
 637                                 case 'a': case 'b': case 'c':
 638                                 case 'd': case 'e': case 'f':
 639                                         /* no need to fix base here */
 640                                         if (base <= 10)
 641                                                 break;  /* not legal here */
 642                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 643                                         goto ok;
 644
 645                                 /* sign ok only as first character */
 646                                 case '+': case '-':
 647                                         if (flags & SIGNOK) {
 648                                                 flags &= ~SIGNOK;
 649                                                 flags |= HAVESIGN;
 650                                                 goto ok;
 651                                         }
 652                                         break;
 653
 654                                 /*
 655                                  * x ok iff flag still set & 2nd char (or
 656                                  * 3rd char if we have a sign).
 657                                  */
 658                                 case 'x': case 'X':
 659                                         if (flags & PFXOK && p ==
 660                                             buf + 1 + !!(flags & HAVESIGN)) {
 661                                                 base = 16;      /* if %i */
 662                                                 flags &= ~PFXOK;
 663                                                 goto ok;
 664                                         }
 665                                         break;
 666                                 }
 667
 668                                 /*
 669                                  * If we got here, c is not a legal character
 670                                  * for a number.  Stop accumulating digits.
 671                                  */
 672                                 if (c != WEOF)
 673                                         __ungetwc(c, fp, loc);
 674                                 break;
 675                 ok:
 676                                 /*
 677                                  * c is legal: store it and look at the next.
 678                                  */
 679                                 *p++ = (wchar_t)c;
 680                         }
 681                         /*
 682                          * If we had only a sign, it is no good; push
 683                          * back the sign.  If the number ends in `x',
 684                          * it was [sign] '0' 'x', so push back the x
 685                          * and treat it as [sign] '0'.
 686                          */
 687                         if (flags & NDIGITS) {
 688                                 if (p > buf)
 689                                         __ungetwc(*--p, fp, loc);
 690                                 goto match_failure;
 691                         }
 692                         c = p[-1];
 693                         if (c == 'x' || c == 'X') {
 694                                 --p;
 695                                 __ungetwc(c, fp, loc);
 696                         }
 697                         if ((flags & SUPPRESS) == 0) {
 698                                 uintmax_t res;
 699
 700                                 *p = 0;
 701                                 if ((flags & UNSIGNED) == 0)
 702                                     res = wcstoimax_l(buf, NULL, base, loc);
 703                                 else
 704                                     res = wcstoumax_l(buf, NULL, base, loc);
 705                                 if (flags & POINTER)
 706                                         *va_arg(ap, void **) =
 707                                                         (void *)(uintptr_t)res;
 708                                 else if (flags & SHORTSHORT)
 709                                         *va_arg(ap, char *) = res;
 710                                 else if (flags & SHORT)
 711                                         *va_arg(ap, short *) = res;
 712                                 else if (flags & LONG)
 713                                         *va_arg(ap, long *) = res;
 714                                 else if (flags & LONGLONG)
 715                                         *va_arg(ap, long long *) = res;
 716                                 else if (flags & INTMAXT)
 717                                         *va_arg(ap, intmax_t *) = res;
 718                                 else if (flags & PTRDIFFT)
 719                                         *va_arg(ap, ptrdiff_t *) = res;
 720                                 else if (flags & SIZET)
 721                                         *va_arg(ap, size_t *) = res;
 722                                 else
 723                                         *va_arg(ap, int *) = res;
 724                                 nassigned++;
 725                         }
 726                         nread += p - buf;
 727                         break;
 728
 729 #ifndef NO_FLOATING_POINT
 730                 case CT_FLOAT:
 731                 {
 732                         wchar_t *pbuf;
 733                         /* scan a floating point number as if by strtod */
 734                         if ((width = parsefloat(fp, &pbuf, width, loc)) == 0)
 735                                 goto match_failure;
 736                         if ((flags & SUPPRESS) == 0) {
 737                                 if (flags & LONGDBL) {
 738                                         long double res = wcstold_l(pbuf, &p, loc);
 739                                         *va_arg(ap, long double *) = res;
 740                                 } else if (flags & LONG) {
 741                                         double res = wcstod_l(pbuf, &p, loc);
 742                                         *va_arg(ap, double *) = res;
 743                                 } else {
 744                                         float res = wcstof_l(pbuf, &p, loc);
 745                                         *va_arg(ap, float *) = res;
 746                                 }
 747                                 nassigned++;
 748                         }
 749                         nread += width;
 750                         break;
 751                 }
 752 #endif /* !NO_FLOATING_POINT */
 753                 }
 754         }
 755 input_failure:
 756         return (nassigned ? nassigned : EOF);
 757 match_failure:
 758         return (nassigned);
 759 }
 760
 761 #ifndef NO_FLOATING_POINT
 762 extern char *__parsefloat_buf(size_t s);  /* see vfscanf-fbsd.c */
 763
 764 static int
 765 parsefloat(FILE *fp, wchar_t **buf, size_t width, locale_t loc)
 766 {
 767         mbstate_t mbs;
 768         size_t nconv;
 769         wchar_t *commit, *p;
 770         int infnanpos = 0;
 771         enum {
 772                 S_START, S_GOTSIGN, S_INF, S_NAN, S_DONE, S_MAYBEHEX,
 773                 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
 774         } state = S_START;
 775         wchar_t c;
 776         wchar_t decpt;
 777         _Bool gotmantdig = 0, ishex = 0;
 778         wchar_t *b;
 779         wchar_t *e;
 780         size_t s;
 781
 782         mbs = initial_mbs;
 783
 784         nconv = mbrtowc_l(&decpt, localeconv()->decimal_point, MB_CUR_MAX_L(loc), &mbs, loc);
 785         if (nconv == (size_t)-1 || nconv == (size_t)-2)
 786                 decpt = '.';    /* failsafe */
 787
 788         s = (width == 0 ? BUF : (width + 1));
 789         if ((b = (wchar_t *)__parsefloat_buf(s * sizeof(wchar_t))) == NULL) {
 790                 *buf = NULL;
 791                 return 0;
 792         }
 793         e = b + (s - 1);
 794         /*
 795          * We set commit = p whenever the string we have read so far
 796          * constitutes a valid representation of a floating point
 797          * number by itself.  At some point, the parse will complete
 798          * or fail, and we will ungetc() back to the last commit point.
 799          * To ensure that the file offset gets updated properly, it is
 800          * always necessary to read at least one character that doesn't
 801          * match; thus, we can't short-circuit "infinity" or "nan(...)".
 802          */
 803         commit = b - 1;
 804         c = WEOF;
 805         for (p = b; width == 0 || p < e; ) {
 806                 if ((c = __fgetwc(fp, loc)) == WEOF)
 807                         break;
 808 reswitch:
 809                 switch (state) {
 810                 case S_START:
 811                         state = S_GOTSIGN;
 812                         if (c == '-' || c == '+')
 813                                 break;
 814                         else
 815                                 goto reswitch;
 816                 case S_GOTSIGN:
 817                         switch (c) {
 818                         case '0':
 819                                 state = S_MAYBEHEX;
 820                                 commit = p;
 821                                 break;
 822                         case 'I':
 823                         case 'i':
 824                                 state = S_INF;
 825                                 break;
 826                         case 'N':
 827                         case 'n':
 828                                 state = S_NAN;
 829                                 break;
 830                         default:
 831                                 state = S_DIGITS;
 832                                 goto reswitch;
 833                         }
 834                         break;
 835                 case S_INF:
 836                         if (infnanpos > 6 ||
 837                             (c != "nfinity"[infnanpos] &&
 838                              c != "NFINITY"[infnanpos]))
 839                                 goto parsedone;
 840                         if (infnanpos == 1 || infnanpos == 6)
 841                                 commit = p;     /* inf or infinity */
 842                         infnanpos++;
 843                         break;
 844                 case S_NAN:
 845                         switch (infnanpos) {
 846                         case 0:
 847                                 if (c != 'A' && c != 'a')
 848                                         goto parsedone;
 849                                 break;
 850                         case 1:
 851                                 if (c != 'N' && c != 'n')
 852                                         goto parsedone;
 853                                 else
 854                                         commit = p;
 855                                 break;
 856                         case 2:
 857                                 if (c != '(')
 858                                         goto parsedone;
 859                                 break;
 860                         default:
 861                                 if (c == ')') {
 862                                         commit = p;
 863                                         state = S_DONE;
 864                                 } else if (!iswalnum_l(c, loc) && c != '_')
 865                                         goto parsedone;
 866                                 break;
 867                         }
 868                         infnanpos++;
 869                         break;
 870                 case S_DONE:
 871                         goto parsedone;
 872                 case S_MAYBEHEX:
 873                         state = S_DIGITS;
 874                         if (c == 'X' || c == 'x') {
 875                                 ishex = 1;
 876                                 break;
 877                         } else {        /* we saw a '0', but no 'x' */
 878                                 gotmantdig = 1;
 879                                 goto reswitch;
 880                         }
 881                 case S_DIGITS:
 882                         if ((ishex && iswxdigit_l(c, loc)) || iswdigit_l(c, loc))
 883                                 gotmantdig = 1;
 884                         else {
 885                                 state = S_FRAC;
 886                                 if (c != decpt)
 887                                         goto reswitch;
 888                         }
 889                         if (gotmantdig)
 890                                 commit = p;
 891                         break;
 892                 case S_FRAC:
 893                         if (((c == 'E' || c == 'e') && !ishex) ||
 894                             ((c == 'P' || c == 'p') && ishex)) {
 895                                 if (!gotmantdig)
 896                                         goto parsedone;
 897                                 else
 898                                         state = S_EXP;
 899                         } else if ((ishex && iswxdigit_l(c, loc)) || iswdigit_l(c, loc)) {
 900                                 commit = p;
 901                                 gotmantdig = 1;
 902                         } else
 903                                 goto parsedone;
 904                         break;
 905                 case S_EXP:
 906                         state = S_EXPDIGITS;
 907                         if (c == '-' || c == '+')
 908                                 break;
 909                         else
 910                                 goto reswitch;
 911                 case S_EXPDIGITS:
 912                         if (iswdigit_l(c, loc))
 913                                 commit = p;
 914                         else
 915                                 goto parsedone;
 916                         break;
 917                 default:
 918                         LIBC_ABORT("unknown state %d", state);
 919                 }
 920                 if (p >= e) {
 921                         ssize_t diff = (p - b);
 922                         ssize_t com = (commit - b);
 923                         s += BUF;
 924                         b = (wchar_t *)__parsefloat_buf(s * sizeof(wchar_t));
 925                         if (b == NULL) {
 926                                 *buf = NULL;
 927                                 return 0;
 928                         }
 929                         e = b + (s - 1);
 930                         p = b + diff;
 931                         commit = b + com;
 932                 }
 933                 *p++ = c;
 934                 c = WEOF;
 935         }
 936
 937 parsedone:
 938         if (c != WEOF)
 939                 __ungetwc(c, fp, loc);
 940         while (commit < --p)
 941                 __ungetwc(*p, fp, loc);
 942         *++commit = '\0';
 943         *buf = b;
 944         return (commit - b);
 945 }
 946 #endif