lib/libc/stdio/vfwscanf.c

   1 /*      $NetBSD: vfwscanf.c,v 1.11 2013/09/23 12:41:37 pooka 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 1.11 2013/09/23 12:41:37 pooka 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 #include <locale.h>
  66 #include "setlocale_local.h"
  67
  68 #define BUF             513     /* Maximum length of numeric string. */
  69
  70 /*
  71  * Flags used during conversion.
  72  */
  73 #define LONG            0x01    /* l: long or double */
  74 #define LONGDBL         0x02    /* L: long double */
  75 #define SHORT           0x04    /* h: short */
  76 #define SUPPRESS        0x08    /* *: suppress assignment */
  77 #define POINTER         0x10    /* p: void * (as hex) */
  78 #define NOSKIP          0x20    /* [ or c: do not skip blanks */
  79 #define LONGLONG        0x400   /* ll: quad_t (+ deprecated q: quad) */
  80 #define INTMAXT         0x800   /* j: intmax_t */
  81 #define PTRDIFFT        0x1000  /* t: ptrdiff_t */
  82 #define SIZET           0x2000  /* z: size_t */
  83 #define SHORTSHORT      0x4000  /* hh: char */
  84 #define UNSIGNED        0x8000  /* %[oupxX] conversions */
  85
  86 /*
  87  * The following are used in integral conversions only:
  88  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
  89  */
  90 #define SIGNOK          0x40    /* +/- is (still) legal */
  91 #define NDIGITS         0x80    /* no digits detected */
  92 #define PFXOK           0x100   /* 0x prefix is (still) legal */
  93 #define NZDIGITS        0x200   /* no zero digits detected */
  94 #define HAVESIGN        0x10000 /* sign detected */
  95
  96 /*
  97  * Conversion types.
  98  */
  99 #define CT_CHAR         0       /* %c conversion */
 100 #define CT_CCL          1       /* %[...] conversion */
 101 #define CT_STRING       2       /* %s conversion */
 102 #define CT_INT          3       /* %[dioupxX] conversion */
 103 #define CT_FLOAT        4       /* %[efgEFG] conversion */
 104
 105 #ifndef NO_FLOATING_POINT
 106 static int parsefloat(FILE *, wchar_t *, wchar_t *, locale_t);
 107 #endif
 108
 109 #define INCCL(_c)       \
 110         (cclcompl ? (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) == NULL) : \
 111         (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) != NULL))
 112
 113 /*
 114  * MT-safe version.
 115  */
 116 int
 117 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
 118 {
 119         return vfwscanf_l(fp, _current_locale(), fmt, ap);
 120 }
 121
 122 int
 123 vfwscanf_l(FILE * __restrict fp, locale_t loc, const wchar_t * __restrict fmt,
 124     va_list ap)
 125 {
 126         int ret;
 127
 128         FLOCKFILE(fp);
 129         _SET_ORIENTATION(fp, 1);
 130         ret = __vfwscanf_unlocked_l(fp, loc, fmt, ap);
 131         FUNLOCKFILE(fp);
 132         return ret;
 133 }
 134
 135 #define SCANF_SKIP_SPACE() \
 136 do { \
 137         wint_t tc; \
 138  \
 139         while ((tc = __fgetwc_unlock(fp)) != WEOF && iswspace_l(tc, loc)) \
 140                 continue; \
 141         if (tc != WEOF) \
 142                 ungetwc(tc, fp); \
 143 } while (/*CONSTCOND*/ 0)
 144
 145 /*
 146  * Non-MT-safe version.
 147  */
 148 int
 149 __vfwscanf_unlocked_l(FILE * __restrict fp, locale_t loc,
 150     const wchar_t * __restrict fmt, va_list ap)
 151 {
 152         wint_t c;               /* character from format, or conversion */
 153         size_t width;           /* field width, or 0 */
 154         wchar_t *p;             /* points into all kinds of strings */
 155         int n;                  /* handy integer */
 156         int flags;              /* flags as defined above */
 157         wchar_t *p0;            /* saves original value of p when necessary */
 158         int nassigned;          /* number of fields assigned */
 159         int nconversions;       /* number of conversions */
 160         size_t nread;           /* number of characters consumed from fp */
 161         int base;               /* base argument to conversion function */
 162         wchar_t buf[BUF];       /* buffer for numeric conversions */
 163         const wchar_t *ccls;    /* character class start */
 164         const wchar_t *ccle;    /* character class end */
 165         int cclcompl;           /* ccl is complemented? */
 166         wint_t wi;              /* handy wint_t */
 167         char *mbp;              /* multibyte string pointer for %c %s %[ */
 168         size_t nconv;           /* number of bytes in mb. conversion */
 169         static const mbstate_t initial;
 170         mbstate_t mbs;
 171         char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */
 172         /* `basefix' is used to avoid `if' tests in the integer scanner */
 173         static short basefix[17] =
 174                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
 175
 176         nassigned = 0;
 177         nconversions = 0;
 178         nread = 0;
 179         ccls = ccle = NULL;
 180         base = 0;
 181         cclcompl = 0;
 182         mbp = NULL;
 183         for (;;) {
 184                 c = *fmt++;
 185                 if (c == 0)
 186                         return nassigned;
 187                 if (iswspace_l(c, loc)) {
 188                         while ((c = __fgetwc_unlock(fp)) != WEOF &&
 189                             iswspace_l(c, loc))
 190                                 ;
 191                         if (c != WEOF)
 192                                 ungetwc(c, fp);
 193                         continue;
 194                 }
 195                 if (c != '%')
 196                         goto literal;
 197                 width = 0;
 198                 flags = 0;
 199                 /*
 200                  * switch on the format.  continue if done;
 201                  * break once format type is derived.
 202                  */
 203 again:          c = *fmt++;
 204                 switch (c) {
 205                 case '%':
 206                         SCANF_SKIP_SPACE();
 207 literal:
 208                         if ((wi = __fgetwc_unlock(fp)) == WEOF)
 209                                 goto input_failure;
 210                         if (wi != c) {
 211                                 ungetwc(wi, fp);
 212                                 goto input_failure;
 213                         }
 214                         nread++;
 215                         continue;
 216
 217                 case '*':
 218                         flags |= SUPPRESS;
 219                         goto again;
 220                 case 'j':
 221                         flags |= INTMAXT;
 222                         goto again;
 223                 case 'l':
 224                         if (flags & LONG) {
 225                                 flags &= ~LONG;
 226                                 flags |= LONGLONG;
 227                         } else
 228                                 flags |= LONG;
 229                         goto again;
 230                 case 'q':
 231                         flags |= LONGLONG;      /* not quite */
 232                         goto again;
 233                 case 't':
 234                         flags |= PTRDIFFT;
 235                         goto again;
 236                 case 'z':
 237                         flags |= SIZET;
 238                         goto again;
 239                 case 'L':
 240                         flags |= LONGDBL;
 241                         goto again;
 242                 case 'h':
 243                         if (flags & SHORT) {
 244                                 flags &= ~SHORT;
 245                                 flags |= SHORTSHORT;
 246                         } else
 247                                 flags |= SHORT;
 248                         goto again;
 249
 250                 case '0': case '1': case '2': case '3': case '4':
 251                 case '5': case '6': case '7': case '8': case '9':
 252                         width = width * 10 + c - '0';
 253                         goto again;
 254
 255                 /*
 256                  * Conversions.
 257                  */
 258                 case 'd':
 259                         c = CT_INT;
 260                         base = 10;
 261                         break;
 262
 263                 case 'i':
 264                         c = CT_INT;
 265                         base = 0;
 266                         break;
 267
 268                 case 'o':
 269                         c = CT_INT;
 270                         flags |= UNSIGNED;
 271                         base = 8;
 272                         break;
 273
 274                 case 'u':
 275                         c = CT_INT;
 276                         flags |= UNSIGNED;
 277                         base = 10;
 278                         break;
 279
 280                 case 'X':
 281                 case 'x':
 282                         flags |= PFXOK; /* enable 0x prefixing */
 283                         c = CT_INT;
 284                         flags |= UNSIGNED;
 285                         base = 16;
 286                         break;
 287
 288 #ifndef NO_FLOATING_POINT
 289                 case 'A': case 'E': case 'F': case 'G':
 290                 case 'a': case 'e': case 'f': case 'g':
 291                         c = CT_FLOAT;
 292                         break;
 293 #endif
 294
 295                 case 'S':
 296                         flags |= LONG;
 297                         /* FALLTHROUGH */
 298                 case 's':
 299                         c = CT_STRING;
 300                         break;
 301
 302                 case '[':
 303                         ccls = fmt;
 304                         if (*fmt == '^') {
 305                                 cclcompl = 1;
 306                                 fmt++;
 307                         } else
 308                                 cclcompl = 0;
 309                         if (*fmt == ']')
 310                                 fmt++;
 311                         while (*fmt != '\0' && *fmt != ']')
 312                                 fmt++;
 313                         ccle = fmt;
 314                         fmt++;
 315                         flags |= NOSKIP;
 316                         c = CT_CCL;
 317                         break;
 318
 319                 case 'C':
 320                         flags |= LONG;
 321                         /* FALLTHROUGH */
 322                 case 'c':
 323                         flags |= NOSKIP;
 324                         c = CT_CHAR;
 325                         break;
 326
 327                 case 'p':       /* pointer format is like hex */
 328                         flags |= POINTER | PFXOK;
 329                         c = CT_INT;             /* assumes sizeof(uintmax_t) */
 330                         flags |= UNSIGNED;      /*      >= sizeof(uintptr_t) */
 331                         base = 16;
 332                         break;
 333
 334                 case 'n':
 335                         nconversions++;
 336                         if (flags & SUPPRESS)   /* ??? */
 337                                 continue;
 338                         if (flags & SHORTSHORT)
 339                                 *va_arg(ap, char *) = (char)nread;
 340                         else if (flags & SHORT)
 341                                 *va_arg(ap, short *) = (short)nread;
 342                         else if (flags & LONG)
 343                                 *va_arg(ap, long *) = nread;
 344                         else if (flags & LONGLONG)
 345                                 *va_arg(ap, quad_t *) = nread;
 346                         else if (flags & INTMAXT)
 347                                 *va_arg(ap, intmax_t *) = nread;
 348                         else if (flags & SIZET)
 349                                 *va_arg(ap, size_t *) = nread;
 350                         else if (flags & PTRDIFFT)
 351                                 *va_arg(ap, ptrdiff_t *) = nread;
 352                         else
 353                                 *va_arg(ap, int *) = (int)nread;
 354                         continue;
 355
 356                 default:
 357                         goto match_failure;
 358
 359                 /*
 360                  * Disgusting backwards compatibility hack.     XXX
 361                  */
 362                 case '\0':      /* compat */
 363                         return EOF;
 364                 }
 365
 366                 /*
 367                  * Consume leading white space, except for formats
 368                  * that suppress this.
 369                  */
 370                 if ((flags & NOSKIP) == 0) {
 371                         while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 372                                iswspace_l(wi, loc))
 373                                 nread++;
 374                         if (wi == WEOF)
 375                                 goto input_failure;
 376                         ungetwc(wi, fp);
 377                 }
 378
 379                 /*
 380                  * Do the conversion.
 381                  */
 382                 switch (c) {
 383
 384                 case CT_CHAR:
 385                         /* scan arbitrary characters (sets NOSKIP) */
 386                         if (width == 0)
 387                                 width = 1;
 388                         if (flags & LONG) {
 389                                 if (!(flags & SUPPRESS))
 390                                         p = va_arg(ap, wchar_t *);
 391                                 n = 0;
 392                                 while (width-- != 0 &&
 393                                     (wi = __fgetwc_unlock(fp)) != WEOF) {
 394                                         if (!(flags & SUPPRESS))
 395                                                 *p++ = (wchar_t)wi;
 396                                         n++;
 397                                 }
 398                                 if (n == 0)
 399                                         goto input_failure;
 400                                 nread += n;
 401                                 if (!(flags & SUPPRESS))
 402                                         nassigned++;
 403                         } else {
 404                                 if (!(flags & SUPPRESS))
 405                                         mbp = va_arg(ap, char *);
 406                                 n = 0;
 407                                 mbs = initial;
 408                                 while (width != 0 &&
 409                                     (wi = __fgetwc_unlock(fp)) != WEOF) {
 410                                         if (width >= MB_CUR_MAX_L(loc) &&
 411                                             !(flags & SUPPRESS)) {
 412                                                 nconv = wcrtomb_l(mbp, wi,
 413                                                     &mbs, loc);
 414                                                 if (nconv == (size_t)-1)
 415                                                         goto input_failure;
 416                                         } else {
 417                                                 nconv = wcrtomb_l(mbbuf, wi,
 418                                                     &mbs, loc);
 419                                                 if (nconv == (size_t)-1)
 420                                                         goto input_failure;
 421                                                 if (nconv > width) {
 422                                                         ungetwc(wi, fp);
 423                                                         break;
 424                                                 }
 425                                                 if (!(flags & SUPPRESS))
 426                                                         memcpy(mbp, mbbuf,
 427                                                             nconv);
 428                                         }
 429                                         if (!(flags & SUPPRESS))
 430                                                 mbp += nconv;
 431                                         width -= nconv;
 432                                         n++;
 433                                 }
 434                                 if (n == 0)
 435                                         goto input_failure;
 436                                 nread += n;
 437                                 if (!(flags & SUPPRESS))
 438                                         nassigned++;
 439                         }
 440                         nconversions++;
 441                         break;
 442
 443                 case CT_CCL:
 444                         /* scan a (nonempty) character class (sets NOSKIP) */
 445                         if (width == 0)
 446                                 width = (size_t)~0;     /* `infinity' */
 447                         /* take only those things in the class */
 448                         if ((flags & SUPPRESS) && (flags & LONG)) {
 449                                 n = 0;
 450                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 451                                     width-- != 0 && INCCL(wi))
 452                                         n++;
 453                                 if (wi != WEOF)
 454                                         ungetwc(wi, fp);
 455                                 if (n == 0)
 456                                         goto match_failure;
 457                         } else if (flags & LONG) {
 458                                 p0 = p = va_arg(ap, wchar_t *);
 459                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 460                                     width-- != 0 && INCCL(wi))
 461                                         *p++ = (wchar_t)wi;
 462                                 if (wi != WEOF)
 463                                         ungetwc(wi, fp);
 464                                 _DIAGASSERT(__type_fit(int, p - p0));
 465                                 n = (int)(p - p0);
 466                                 if (n == 0)
 467                                         goto match_failure;
 468                                 *p = 0;
 469                                 nassigned++;
 470                         } else {
 471                                 if (!(flags & SUPPRESS))
 472                                         mbp = va_arg(ap, char *);
 473                                 n = 0;
 474                                 mbs = initial;
 475                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 476                                     width != 0 && INCCL(wi)) {
 477                                         if (width >= MB_CUR_MAX_L(loc) &&
 478                                            !(flags & SUPPRESS)) {
 479                                                 nconv = wcrtomb_l(mbp, wi,
 480                                                     &mbs, loc);
 481                                                 if (nconv == (size_t)-1)
 482                                                         goto input_failure;
 483                                         } else {
 484                                                 nconv = wcrtomb_l(mbbuf, wi,
 485                                                     &mbs, loc);
 486                                                 if (nconv == (size_t)-1)
 487                                                         goto input_failure;
 488                                                 if (nconv > width)
 489                                                         break;
 490                                                 if (!(flags & SUPPRESS))
 491                                                         memcpy(mbp, mbbuf,
 492                                                             nconv);
 493                                         }
 494                                         if (!(flags & SUPPRESS))
 495                                                 mbp += nconv;
 496                                         width -= nconv;
 497                                         n++;
 498                                 }
 499                                 if (wi != WEOF)
 500                                         ungetwc(wi, fp);
 501                                 if (!(flags & SUPPRESS)) {
 502                                         *mbp = 0;
 503                                         nassigned++;
 504                                 }
 505                         }
 506                         nread += n;
 507                         nconversions++;
 508                         break;
 509
 510                 case CT_STRING:
 511                         /* like CCL, but zero-length string OK, & no NOSKIP */
 512                         if (width == 0)
 513                                 width = (size_t)~0;
 514                         if ((flags & SUPPRESS) && (flags & LONG)) {
 515                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 516                                     width-- != 0 &&
 517                                     !iswspace_l(wi, loc))
 518                                         nread++;
 519                                 if (wi != WEOF)
 520                                         ungetwc(wi, fp);
 521                         } else if (flags & LONG) {
 522                                 p0 = p = va_arg(ap, wchar_t *);
 523                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 524                                     width-- != 0 &&
 525                                     !iswspace_l(wi, loc)) {
 526                                         *p++ = (wchar_t)wi;
 527                                         nread++;
 528                                 }
 529                                 if (wi != WEOF)
 530                                         ungetwc(wi, fp);
 531                                 *p = '\0';
 532                                 nassigned++;
 533                         } else {
 534                                 if (!(flags & SUPPRESS))
 535                                         mbp = va_arg(ap, char *);
 536                                 mbs = initial;
 537                                 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
 538                                     width != 0 &&
 539                                     !iswspace_l(wi, loc)) {
 540                                         if (width >= MB_CUR_MAX_L(loc) &&
 541                                             !(flags & SUPPRESS)) {
 542                                                 nconv = wcrtomb_l(mbp, wi,
 543                                                     &mbs, loc);
 544                                                 if (nconv == (size_t)-1)
 545                                                         goto input_failure;
 546                                         } else {
 547                                                 nconv = wcrtomb_l(mbbuf, wi,
 548                                                     &mbs, loc);
 549                                                 if (nconv == (size_t)-1)
 550                                                         goto input_failure;
 551                                                 if (nconv > width)
 552                                                         break;
 553                                                 if (!(flags & SUPPRESS))
 554                                                         memcpy(mbp, mbbuf,
 555                                                             nconv);
 556                                         }
 557                                         if (!(flags & SUPPRESS))
 558                                                 mbp += nconv;
 559                                         width -= nconv;
 560                                         nread++;
 561                                 }
 562                                 if (wi != WEOF)
 563                                         ungetwc(wi, fp);
 564                                 if (!(flags & SUPPRESS)) {
 565                                         *mbp = 0;
 566                                         nassigned++;
 567                                 }
 568                         }
 569                         nconversions++;
 570                         continue;
 571
 572                 case CT_INT:
 573                         /* scan an integer as if by the conversion function */
 574                         if (width == 0 || width > sizeof(buf) /
 575                             sizeof(*buf) - 1)
 576                                 width = sizeof(buf) / sizeof(*buf) - 1;
 577                         flags |= SIGNOK | NDIGITS | NZDIGITS;
 578                         for (p = buf; width; width--) {
 579                                 c = __fgetwc_unlock(fp);
 580                                 /*
 581                                  * Switch on the character; `goto ok'
 582                                  * if we accept it as a part of number.
 583                                  */
 584                                 switch (c) {
 585
 586                                 /*
 587                                  * The digit 0 is always legal, but is
 588                                  * special.  For %i conversions, if no
 589                                  * digits (zero or nonzero) have been
 590                                  * scanned (only signs), we will have
 591                                  * base==0.  In that case, we should set
 592                                  * it to 8 and enable 0x prefixing.
 593                                  * Also, if we have not scanned zero digits
 594                                  * before this, do not turn off prefixing
 595                                  * (someone else will turn it off if we
 596                                  * have scanned any nonzero digits).
 597                                  */
 598                                 case '0':
 599                                         if (base == 0) {
 600                                                 base = 8;
 601                                                 flags |= PFXOK;
 602                                         }
 603                                         if (flags & NZDIGITS)
 604                                             flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
 605                                         else
 606                                             flags &= ~(SIGNOK|PFXOK|NDIGITS);
 607                                         goto ok;
 608
 609                                 /* 1 through 7 always legal */
 610                                 case '1': case '2': case '3':
 611                                 case '4': case '5': case '6': case '7':
 612                                         base = basefix[base];
 613                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 614                                         goto ok;
 615
 616                                 /* digits 8 and 9 ok iff decimal or hex */
 617                                 case '8': case '9':
 618                                         base = basefix[base];
 619                                         if (base <= 8)
 620                                                 break;  /* not legal here */
 621                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 622                                         goto ok;
 623
 624                                 /* letters ok iff hex */
 625                                 case 'A': case 'B': case 'C':
 626                                 case 'D': case 'E': case 'F':
 627                                 case 'a': case 'b': case 'c':
 628                                 case 'd': case 'e': case 'f':
 629                                         /* no need to fix base here */
 630                                         if (base <= 10)
 631                                                 break;  /* not legal here */
 632                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 633                                         goto ok;
 634
 635                                 /* sign ok only as first character */
 636                                 case '+': case '-':
 637                                         if (flags & SIGNOK) {
 638                                                 flags &= ~SIGNOK;
 639                                                 flags |= HAVESIGN;
 640                                                 goto ok;
 641                                         }
 642                                         break;
 643
 644                                 /*
 645                                  * x ok iff flag still set & 2nd char (or
 646                                  * 3rd char if we have a sign).
 647                                  */
 648                                 case 'x': case 'X':
 649                                         if (flags & PFXOK && p ==
 650                                             buf + 1 + !!(flags & HAVESIGN)) {
 651                                                 base = 16;      /* if %i */
 652                                                 flags &= ~PFXOK;
 653                                                 goto ok;
 654                                         }
 655                                         break;
 656                                 }
 657
 658                                 /*
 659                                  * If we got here, c is not a legal character
 660                                  * for a number.  Stop accumulating digits.
 661                                  */
 662                                 if (c != WEOF)
 663                                         ungetwc(c, fp);
 664                                 break;
 665                 ok:
 666                                 /*
 667                                  * c is legal: store it and look at the next.
 668                                  */
 669                                 *p++ = (wchar_t)c;
 670                         }
 671                         /*
 672                          * If we had only a sign, it is no good; push
 673                          * back the sign.  If the number ends in `x',
 674                          * it was [sign] '0' 'x', so push back the x
 675                          * and treat it as [sign] '0'.
 676                          */
 677                         if (flags & NDIGITS) {
 678                                 if (p > buf)
 679                                         ungetwc(*--p, fp);
 680                                 goto match_failure;
 681                         }
 682                         c = p[-1];
 683                         if (c == 'x' || c == 'X') {
 684                                 --p;
 685                                 ungetwc(c, fp);
 686                         }
 687                         if ((flags & SUPPRESS) == 0) {
 688                                 uintmax_t res;
 689
 690                                 *p = 0;
 691                                 if ((flags & UNSIGNED) == 0)
 692                                     res = wcstoimax_l(buf, NULL, base, loc);
 693                                 else
 694                                     res = wcstoumax_l(buf, NULL, base, loc);
 695                                 if (flags & POINTER)
 696                                         *va_arg(ap, void **) =
 697                                                         (void *)(uintptr_t)res;
 698                                 else if (flags & SHORTSHORT)
 699                                         *va_arg(ap, char *) = (char)res;
 700                                 else if (flags & SHORT)
 701                                         *va_arg(ap, short *) = (short)res;
 702                                 else if (flags & LONG)
 703                                         *va_arg(ap, long *) = (long)res;
 704                                 else if (flags & LONGLONG)
 705                                         *va_arg(ap, quad_t *) = res;
 706                                 else if (flags & INTMAXT)
 707                                         *va_arg(ap, intmax_t *) = res;
 708                                 else if (flags & PTRDIFFT)
 709                                         *va_arg(ap, ptrdiff_t *) = (ptrdiff_t)res;
 710                                 else if (flags & SIZET)
 711                                         *va_arg(ap, size_t *) = (size_t)res;
 712                                 else
 713                                         *va_arg(ap, int *) = (int)res;
 714                                 nassigned++;
 715                         }
 716                         _DIAGASSERT(__type_fit(int, p - buf));
 717                         nread += (int)(p - buf);
 718                         nconversions++;
 719                         break;
 720
 721 #ifndef NO_FLOATING_POINT
 722                 case CT_FLOAT:
 723                         /* scan a floating point number as if by strtod */
 724                         if (width == 0 || width > sizeof(buf) /
 725                             sizeof(*buf) - 1)
 726                                 width = sizeof(buf) / sizeof(*buf) - 1;
 727                         if ((width = parsefloat(fp, buf, buf + width, loc)) == 0)
 728                                 goto match_failure;
 729                         if ((flags & SUPPRESS) == 0) {
 730                                 if (flags & LONGDBL) {
 731                                         long double res = wcstold_l(buf, &p,
 732                                             loc);
 733                                         *va_arg(ap, long double *) = res;
 734                                 } else
 735                                 if (flags & LONG) {
 736                                         double res = wcstod_l(buf, &p, loc);
 737                                         *va_arg(ap, double *) = res;
 738                                 } else {
 739                                         float res = wcstof_l(buf, &p, loc);
 740                                         *va_arg(ap, float *) = res;
 741                                 }
 742 #ifdef DEBUG
 743                                 if (p - buf != (ptrdiff_t)width)
 744                                         abort();
 745 #endif
 746                                 nassigned++;
 747                         }
 748                         nread += width;
 749                         nconversions++;
 750                         break;
 751 #endif /* !NO_FLOATING_POINT */
 752                 }
 753         }
 754 input_failure:
 755         return nconversions != 0 ? nassigned : EOF;
 756 match_failure:
 757         return nassigned;
 758 }
 759
 760 #ifndef NO_FLOATING_POINT
 761 static int
 762 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end, locale_t loc)
 763 {
 764         wchar_t *commit, *p;
 765         int infnanpos = 0;
 766         enum {
 767                 S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX,
 768                 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
 769         } state = S_START;
 770         wchar_t c;
 771         wchar_t decpt = (wchar_t)(unsigned char)*localeconv_l(loc)->decimal_point;
 772         int gotmantdig = 0, ishex = 0;
 773
 774         /*
 775          * We set commit = p whenever the string we have read so far
 776          * constitutes a valid representation of a floating point
 777          * number by itself.  At some point, the parse will complete
 778          * or fail, and we will ungetc() back to the last commit point.
 779          * To ensure that the file offset gets updated properly, it is
 780          * always necessary to read at least one character that doesn't
 781          * match; thus, we can't short-circuit "infinity" or "nan(...)".
 782          */
 783         commit = buf - 1;
 784         c = WEOF;
 785         for (p = buf; p < end; ) {
 786                 if ((c = __fgetwc_unlock(fp)) == WEOF)
 787                         break;
 788 reswitch:
 789                 switch (state) {
 790                 case S_START:
 791                         state = S_GOTSIGN;
 792                         if (c == '-' || c == '+')
 793                                 break;
 794                         else
 795                                 goto reswitch;
 796                 case S_GOTSIGN:
 797                         switch (c) {
 798                         case '0':
 799                                 state = S_MAYBEHEX;
 800                                 commit = p;
 801                                 break;
 802                         case 'I':
 803                         case 'i':
 804                                 state = S_INF;
 805                                 break;
 806                         case 'N':
 807                         case 'n':
 808                                 state = S_NAN;
 809                                 break;
 810                         default:
 811                                 state = S_DIGITS;
 812                                 goto reswitch;
 813                         }
 814                         break;
 815                 case S_INF:
 816                         if (infnanpos > 6 ||
 817                             (c != "nfinity"[infnanpos] &&
 818                              c != "NFINITY"[infnanpos]))
 819                                 goto parsedone;
 820                         if (infnanpos == 1 || infnanpos == 6)
 821                                 commit = p;     /* inf or infinity */
 822                         infnanpos++;
 823                         break;
 824                 case S_NAN:
 825                         switch (infnanpos) {
 826                         case -1:        /* XXX kludge to deal with nan(...) */
 827                                 goto parsedone;
 828                         case 0:
 829                                 if (c != 'A' && c != 'a')
 830                                         goto parsedone;
 831                                 break;
 832                         case 1:
 833                                 if (c != 'N' && c != 'n')
 834                                         goto parsedone;
 835                                 else
 836                                         commit = p;
 837                                 break;
 838                         case 2:
 839                                 if (c != '(')
 840                                         goto parsedone;
 841                                 break;
 842                         default:
 843                                 if (c == ')') {
 844                                         commit = p;
 845                                         infnanpos = -2;
 846                                 } else if (!iswalnum_l(c, loc) && c != '_')
 847                                         goto parsedone;
 848                                 break;
 849                         }
 850                         infnanpos++;
 851                         break;
 852                 case S_MAYBEHEX:
 853                         state = S_DIGITS;
 854                         if (c == 'X' || c == 'x') {
 855                                 ishex = 1;
 856                                 break;
 857                         } else {        /* we saw a '0', but no 'x' */
 858                                 gotmantdig = 1;
 859                                 goto reswitch;
 860                         }
 861                 case S_DIGITS:
 862                         if ((ishex && iswxdigit_l(c, loc)) ||
 863                             iswdigit_l(c, loc))
 864                                 gotmantdig = 1;
 865                         else {
 866                                 state = S_FRAC;
 867                                 if (c != decpt)
 868                                         goto reswitch;
 869                         }
 870                         if (gotmantdig)
 871                                 commit = p;
 872                         break;
 873                 case S_FRAC:
 874                         if (((c == 'E' || c == 'e') && !ishex) ||
 875                             ((c == 'P' || c == 'p') && ishex)) {
 876                                 if (!gotmantdig)
 877                                         goto parsedone;
 878                                 else
 879                                         state = S_EXP;
 880                         } else if ((ishex && iswxdigit_l(c, loc)) ||
 881                             iswdigit_l(c, loc)) {
 882                                 commit = p;
 883                                 gotmantdig = 1;
 884                         } else
 885                                 goto parsedone;
 886                         break;
 887                 case S_EXP:
 888                         state = S_EXPDIGITS;
 889                         if (c == '-' || c == '+')
 890                                 break;
 891                         else
 892                                 goto reswitch;
 893                 case S_EXPDIGITS:
 894                         if (iswdigit_l(c, loc))
 895                                 commit = p;
 896                         else
 897                                 goto parsedone;
 898                         break;
 899                 default:
 900                         abort();
 901                 }
 902                 *p++ = c;
 903                 c = WEOF;
 904         }
 905
 906 parsedone:
 907         if (c != WEOF)
 908                 ungetwc(c, fp);
 909         while (commit < --p)
 910                 ungetwc(*p, fp);
 911         *++commit = '\0';
 912         _DIAGASSERT(__type_fit(int, commit - buf));
 913         return (int)(commit - buf);
 914 }
 915 #endif