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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  * Copyright (c) 2011 The FreeBSD Foundation
9  * All rights reserved.
10  * Portions of this software were developed by David Chisnall
11  * under sponsorship from the FreeBSD Foundation.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  *    notice, this list of conditions and the following disclaimer.
18  * 2. Redistributions in binary form must reproduce the above copyright
19  *    notice, this list of conditions and the following disclaimer in the
20  *    documentation and/or other materials provided with the distribution.
21  * 3. Neither the name of the University nor the names of its contributors
22  *    may be used to endorse or promote products derived from this software
23  *    without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  */
37
38 #if 0
39 #if defined(LIBC_SCCS) && !defined(lint)
40 static char sccsid[] = "@(#)vfscanf.c   8.1 (Berkeley) 6/4/93";
41 #endif /* LIBC_SCCS and not lint */
42 #endif
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
45
46 #include "namespace.h"
47 #include <ctype.h>
48 #include <inttypes.h>
49 #include <limits.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <stddef.h>
53 #include <stdarg.h>
54 #include <string.h>
55 #include <wchar.h>
56 #include <wctype.h>
57 #include "un-namespace.h"
58
59 #include "libc_private.h"
60 #include "local.h"
61 #include "xlocale_private.h"
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 *, wchar_t *, locale_t);
102 #endif
103
104 struct ccl {
105         const wchar_t *start;   /* character class start */
106         const wchar_t *end;     /* character class end */
107         int compl;              /* ccl is complemented? */
108 };
109
110 static __inline int
111 inccl(const struct ccl *ccl, wint_t wi)
112 {
113
114         if (ccl->compl) {
115                 return (wmemchr(ccl->start, wi, ccl->end - ccl->start)
116                     == NULL);
117         } else {
118                 return (wmemchr(ccl->start, wi, ccl->end - ccl->start) != NULL);
119         }
120 }
121
122 /*
123  * Conversion functions are passed a pointer to this object instead of
124  * a real parameter to indicate that the assignment-suppression (*)
125  * flag was specified.  We could use a NULL pointer to indicate this,
126  * but that would mask bugs in applications that call scanf() with a
127  * NULL pointer.
128  */
129 static const int suppress;
130 #define SUPPRESS_PTR    ((void *)&suppress)
131
132 static const mbstate_t initial_mbs;
133
134 /*
135  * The following conversion functions return the number of characters consumed,
136  * or -1 on input failure.  Character class conversion returns 0 on match
137  * failure.
138  */
139
140 static __inline int
141 convert_char(FILE *fp, char * mbp, int width, locale_t locale)
142 {
143         mbstate_t mbs;
144         size_t nconv;
145         wint_t wi;
146         int n;
147
148         n = 0;
149         mbs = initial_mbs;
150         while (width-- != 0 && (wi = __fgetwc(fp, locale)) != WEOF) {
151                 if (mbp != SUPPRESS_PTR) {
152                         nconv = wcrtomb(mbp, wi, &mbs);
153                         if (nconv == (size_t)-1)
154                                 return (-1);
155                         mbp += nconv;
156                 }
157                 n++;
158         }
159         if (n == 0)
160                 return (-1);
161         return (n);
162 }
163
164 static __inline int
165 convert_wchar(FILE *fp, wchar_t *wcp, int width, locale_t locale)
166 {
167         wint_t wi;
168         int n;
169
170         n = 0;
171         while (width-- != 0 && (wi = __fgetwc(fp, locale)) != WEOF) {
172                 if (wcp != SUPPRESS_PTR)
173                         *wcp++ = (wchar_t)wi;
174                 n++;
175         }
176         if (n == 0)
177                 return (-1);
178         return (n);
179 }
180
181 static __inline int
182 convert_ccl(FILE *fp, char * mbp, int width, const struct ccl *ccl,
183     locale_t locale)
184 {
185         mbstate_t mbs;
186         size_t nconv;
187         wint_t wi;
188         int n;
189
190         n = 0;
191         mbs = initial_mbs;
192         while ((wi = __fgetwc(fp, locale)) != WEOF &&
193             width-- != 0 && inccl(ccl, wi)) {
194                 if (mbp != SUPPRESS_PTR) {
195                         nconv = wcrtomb(mbp, wi, &mbs);
196                         if (nconv == (size_t)-1)
197                                 return (-1);
198                         mbp += nconv;
199                 }
200                 n++;
201         }
202         if (wi != WEOF)
203                 __ungetwc(wi, fp, locale);
204         if (mbp != SUPPRESS_PTR)
205                 *mbp = 0;
206         return (n);
207 }
208
209 static __inline int
210 convert_wccl(FILE *fp, wchar_t *wcp, int width, const struct ccl *ccl,
211     locale_t locale)
212 {
213         wchar_t *wcp0;
214         wint_t wi;
215         int n;
216
217         if (wcp == SUPPRESS_PTR) {
218                 n = 0;
219                 while ((wi = __fgetwc(fp, locale)) != WEOF &&
220                     width-- != 0 && inccl(ccl, wi))
221                         n++;
222                 if (wi != WEOF)
223                         __ungetwc(wi, fp, locale);
224         } else {
225                 wcp0 = wcp;
226                 while ((wi = __fgetwc(fp, locale)) != WEOF &&
227                     width-- != 0 && inccl(ccl, wi))
228                         *wcp++ = (wchar_t)wi;
229                 if (wi != WEOF)
230                         __ungetwc(wi, fp, locale);
231                 n = wcp - wcp0;
232                 if (n == 0)
233                         return (0);
234                 *wcp = 0;
235         }
236         return (n);
237 }
238
239 static __inline int
240 convert_string(FILE *fp, char * mbp, int width, locale_t locale)
241 {
242         mbstate_t mbs;
243         size_t nconv;
244         wint_t wi;
245         int nread;
246
247         mbs = initial_mbs;
248         nread = 0;
249         while ((wi = __fgetwc(fp, locale)) != WEOF && width-- != 0 &&
250             !iswspace(wi)) {
251                 if (mbp != SUPPRESS_PTR) {
252                         nconv = wcrtomb(mbp, wi, &mbs);
253                         if (nconv == (size_t)-1)
254                                 return (-1);
255                         mbp += nconv;
256                 }
257                 nread++;
258         }
259         if (wi != WEOF)
260                 __ungetwc(wi, fp, locale);
261         if (mbp != SUPPRESS_PTR)
262                 *mbp = 0;
263         return (nread);
264 }
265
266 static __inline int
267 convert_wstring(FILE *fp, wchar_t *wcp, int width, locale_t locale)
268 {
269         wchar_t *wcp0;
270         wint_t wi;
271         int nread;
272
273         nread = 0;
274         if (wcp == SUPPRESS_PTR) {
275                 while ((wi = __fgetwc(fp, locale)) != WEOF &&
276                     width-- != 0 && !iswspace(wi))
277                         nread++;
278                 if (wi != WEOF)
279                         __ungetwc(wi, fp, locale);
280         } else {
281                 wcp0 = wcp;
282                 while ((wi = __fgetwc(fp, locale)) != WEOF &&
283                     width-- != 0 && !iswspace(wi)) {
284                         *wcp++ = (wchar_t)wi;
285                         nread++;
286                 }
287                 if (wi != WEOF)
288                         __ungetwc(wi, fp, locale);
289                 *wcp = '\0';
290         }
291         return (nread);
292 }
293
294 /*
295  * Read an integer, storing it in buf.  The only relevant bit in the
296  * flags argument is PFXOK.
297  *
298  * Return 0 on a match failure, and the number of characters read
299  * otherwise.
300  */
301 static __inline int
302 parseint(FILE *fp, wchar_t *buf, int width, int base, int flags,
303     locale_t locale)
304 {
305         /* `basefix' is used to avoid `if' tests */
306         static const short basefix[17] =
307                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
308         wchar_t *wcp;
309         int c;
310
311         flags |= SIGNOK | NDIGITS | NZDIGITS;
312         for (wcp = buf; width; width--) {
313                 c = __fgetwc(fp, locale);
314                 /*
315                  * Switch on the character; `goto ok' if we accept it
316                  * as a part of number.
317                  */
318                 switch (c) {
319
320                 /*
321                  * The digit 0 is always legal, but is special.  For
322                  * %i conversions, if no digits (zero or nonzero) have
323                  * been scanned (only signs), we will have base==0.
324                  * In that case, we should set it to 8 and enable 0x
325                  * prefixing.  Also, if we have not scanned zero
326                  * digits before this, do not turn off prefixing
327                  * (someone else will turn it off if we have scanned
328                  * any nonzero digits).
329                  */
330                 case '0':
331                         if (base == 0) {
332                                 base = 8;
333                                 flags |= PFXOK;
334                         }
335                         if (flags & NZDIGITS)
336                                 flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
337                         else
338                                 flags &= ~(SIGNOK|PFXOK|NDIGITS);
339                         goto ok;
340
341                 /* 1 through 7 always legal */
342                 case '1': case '2': case '3':
343                 case '4': case '5': case '6': case '7':
344                         base = basefix[base];
345                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
346                         goto ok;
347
348                 /* digits 8 and 9 ok iff decimal or hex */
349                 case '8': case '9':
350                         base = basefix[base];
351                         if (base <= 8)
352                                 break;  /* not legal here */
353                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
354                         goto ok;
355
356                 /* letters ok iff hex */
357                 case 'A': case 'B': case 'C':
358                 case 'D': case 'E': case 'F':
359                 case 'a': case 'b': case 'c':
360                 case 'd': case 'e': case 'f':
361                         /* no need to fix base here */
362                         if (base <= 10)
363                                 break;  /* not legal here */
364                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
365                         goto ok;
366
367                 /* sign ok only as first character */
368                 case '+': case '-':
369                         if (flags & SIGNOK) {
370                                 flags &= ~SIGNOK;
371                                 flags |= HAVESIGN;
372                                 goto ok;
373                         }
374                         break;
375
376                 /*
377                  * x ok iff flag still set & 2nd char (or 3rd char if
378                  * we have a sign).
379                  */
380                 case 'x': case 'X':
381                         if (flags & PFXOK && wcp ==
382                             buf + 1 + !!(flags & HAVESIGN)) {
383                                 base = 16;      /* if %i */
384                                 flags &= ~PFXOK;
385                                 goto ok;
386                         }
387                         break;
388                 }
389
390                 /*
391                  * If we got here, c is not a legal character for a
392                  * number.  Stop accumulating digits.
393                  */
394                 if (c != WEOF)
395                         __ungetwc(c, fp, locale);
396                 break;
397         ok:
398                 /*
399                  * c is legal: store it and look at the next.
400                  */
401                 *wcp++ = (wchar_t)c;
402         }
403         /*
404          * If we had only a sign, it is no good; push back the sign.
405          * If the number ends in `x', it was [sign] '0' 'x', so push
406          * back the x and treat it as [sign] '0'.
407          */
408         if (flags & NDIGITS) {
409                 if (wcp > buf)
410                         __ungetwc(*--wcp, fp, locale);
411                 return (0);
412         }
413         c = wcp[-1];
414         if (c == 'x' || c == 'X') {
415                 --wcp;
416                 __ungetwc(c, fp, locale);
417         }
418         return (wcp - buf);
419 }
420
421 /*
422  * MT-safe version.
423  */
424 int
425 vfwscanf_l(FILE * __restrict fp, locale_t locale,
426                 const wchar_t * __restrict fmt, va_list ap)
427 {
428         int ret;
429         FIX_LOCALE(locale);
430
431         FLOCKFILE(fp);
432         ORIENT(fp, 1);
433         ret = __vfwscanf(fp, locale, fmt, ap);
434         FUNLOCKFILE(fp);
435         return (ret);
436 }
437 int
438 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
439 {
440         return vfwscanf_l(fp, __get_locale(), fmt, ap);
441 }
442
443 /*
444  * Non-MT-safe version.
445  */
446 int
447 __vfwscanf(FILE * __restrict fp, locale_t locale,
448                 const wchar_t * __restrict fmt, va_list ap)
449 {
450 #define GETARG(type)    ((flags & SUPPRESS) ? SUPPRESS_PTR : va_arg(ap, type))
451         wint_t c;               /* character from format, or conversion */
452         size_t width;           /* field width, or 0 */
453         int flags;              /* flags as defined above */
454         int nassigned;          /* number of fields assigned */
455         int nconversions;       /* number of conversions */
456         int nr;                 /* characters read by the current conversion */
457         int nread;              /* number of characters consumed from fp */
458         int base;               /* base argument to conversion function */
459         struct ccl ccl;         /* character class info */
460         wchar_t buf[BUF];       /* buffer for numeric conversions */
461         wint_t wi;              /* handy wint_t */
462
463         nassigned = 0;
464         nconversions = 0;
465         nread = 0;
466         ccl.start = ccl.end = NULL;
467         for (;;) {
468                 c = *fmt++;
469                 if (c == 0)
470                         return (nassigned);
471                 if (iswspace(c)) {
472                         while ((c = __fgetwc(fp, locale)) != WEOF &&
473                             iswspace_l(c, locale))
474                                 nread++;
475                         if (c != WEOF)
476                                 __ungetwc(c, fp, locale);
477                         continue;
478                 }
479                 if (c != '%')
480                         goto literal;
481                 width = 0;
482                 flags = 0;
483                 /*
484                  * switch on the format.  continue if done;
485                  * break once format type is derived.
486                  */
487 again:          c = *fmt++;
488                 switch (c) {
489                 case '%':
490 literal:
491                         if ((wi = __fgetwc(fp, locale)) == WEOF)
492                                 goto input_failure;
493                         if (wi != c) {
494                                 __ungetwc(wi, fp, locale);
495                                 goto input_failure;
496                         }
497                         nread++;
498                         continue;
499
500                 case '*':
501                         flags |= SUPPRESS;
502                         goto again;
503                 case 'j':
504                         flags |= INTMAXT;
505                         goto again;
506                 case 'l':
507                         if (flags & LONG) {
508                                 flags &= ~LONG;
509                                 flags |= LONGLONG;
510                         } else
511                                 flags |= LONG;
512                         goto again;
513                 case 'q':
514                         flags |= LONGLONG;      /* not quite */
515                         goto again;
516                 case 't':
517                         flags |= PTRDIFFT;
518                         goto again;
519                 case 'z':
520                         flags |= SIZET;
521                         goto again;
522                 case 'L':
523                         flags |= LONGDBL;
524                         goto again;
525                 case 'h':
526                         if (flags & SHORT) {
527                                 flags &= ~SHORT;
528                                 flags |= SHORTSHORT;
529                         } else
530                                 flags |= SHORT;
531                         goto again;
532
533                 case '0': case '1': case '2': case '3': case '4':
534                 case '5': case '6': case '7': case '8': case '9':
535                         width = width * 10 + c - '0';
536                         goto again;
537
538                 /*
539                  * Conversions.
540                  */
541                 case 'd':
542                         c = CT_INT;
543                         base = 10;
544                         break;
545
546                 case 'i':
547                         c = CT_INT;
548                         base = 0;
549                         break;
550
551                 case 'o':
552                         c = CT_INT;
553                         flags |= UNSIGNED;
554                         base = 8;
555                         break;
556
557                 case 'u':
558                         c = CT_INT;
559                         flags |= UNSIGNED;
560                         base = 10;
561                         break;
562
563                 case 'X':
564                 case 'x':
565                         flags |= PFXOK; /* enable 0x prefixing */
566                         c = CT_INT;
567                         flags |= UNSIGNED;
568                         base = 16;
569                         break;
570
571 #ifndef NO_FLOATING_POINT
572                 case 'A': case 'E': case 'F': case 'G':
573                 case 'a': case 'e': case 'f': case 'g':
574                         c = CT_FLOAT;
575                         break;
576 #endif
577
578                 case 'S':
579                         flags |= LONG;
580                         /* FALLTHROUGH */
581                 case 's':
582                         c = CT_STRING;
583                         break;
584
585                 case '[':
586                         ccl.start = fmt;
587                         if (*fmt == '^') {
588                                 ccl.compl = 1;
589                                 fmt++;
590                         } else
591                                 ccl.compl = 0;
592                         if (*fmt == ']')
593                                 fmt++;
594                         while (*fmt != '\0' && *fmt != ']')
595                                 fmt++;
596                         ccl.end = fmt;
597                         fmt++;
598                         flags |= NOSKIP;
599                         c = CT_CCL;
600                         break;
601
602                 case 'C':
603                         flags |= LONG;
604                         /* FALLTHROUGH */
605                 case 'c':
606                         flags |= NOSKIP;
607                         c = CT_CHAR;
608                         break;
609
610                 case 'p':       /* pointer format is like hex */
611                         flags |= POINTER | PFXOK;
612                         c = CT_INT;             /* assumes sizeof(uintmax_t) */
613                         flags |= UNSIGNED;      /*      >= sizeof(uintptr_t) */
614                         base = 16;
615                         break;
616
617                 case 'n':
618                         if (flags & SUPPRESS)   /* ??? */
619                                 continue;
620                         if (flags & SHORTSHORT)
621                                 *va_arg(ap, char *) = nread;
622                         else if (flags & SHORT)
623                                 *va_arg(ap, short *) = nread;
624                         else if (flags & LONG)
625                                 *va_arg(ap, long *) = nread;
626                         else if (flags & LONGLONG)
627                                 *va_arg(ap, long long *) = nread;
628                         else if (flags & INTMAXT)
629                                 *va_arg(ap, intmax_t *) = nread;
630                         else if (flags & SIZET)
631                                 *va_arg(ap, size_t *) = nread;
632                         else if (flags & PTRDIFFT)
633                                 *va_arg(ap, ptrdiff_t *) = nread;
634                         else
635                                 *va_arg(ap, int *) = nread;
636                         continue;
637
638                 default:
639                         goto match_failure;
640
641                 /*
642                  * Disgusting backwards compatibility hack.     XXX
643                  */
644                 case '\0':      /* compat */
645                         return (EOF);
646                 }
647
648                 /*
649                  * Consume leading white space, except for formats
650                  * that suppress this.
651                  */
652                 if ((flags & NOSKIP) == 0) {
653                         while ((wi = __fgetwc(fp, locale)) != WEOF && iswspace(wi))
654                                 nread++;
655                         if (wi == WEOF)
656                                 goto input_failure;
657                         __ungetwc(wi, fp, locale);
658                 }
659
660                 /*
661                  * Do the conversion.
662                  */
663                 switch (c) {
664
665                 case CT_CHAR:
666                         /* scan arbitrary characters (sets NOSKIP) */
667                         if (width == 0)
668                                 width = 1;
669                         if (flags & LONG) {
670                                 nr = convert_wchar(fp, GETARG(wchar_t *), width,
671                                     locale);
672                         } else {
673                                 nr = convert_char(fp, GETARG(char *), width,
674                                     locale);
675                         }
676                         if (nr < 0)
677                                 goto input_failure;
678                         break;
679
680                 case CT_CCL:
681                         /* scan a (nonempty) character class (sets NOSKIP) */
682                         if (width == 0)
683                                 width = (size_t)~0;     /* `infinity' */
684                         /* take only those things in the class */
685                         if (flags & LONG) {
686                                 nr = convert_wccl(fp, GETARG(wchar_t *), width,
687                                     &ccl, locale);
688                         } else {
689                                 nr = convert_ccl(fp, GETARG(char *), width,
690                                     &ccl, locale);
691                         }
692                         if (nr <= 0) {
693                                 if (nr < 0)
694                                         goto input_failure;
695                                 else /* nr == 0 */
696                                         goto match_failure;
697                         }
698                         break;
699
700                 case CT_STRING:
701                         /* like CCL, but zero-length string OK, & no NOSKIP */
702                         if (width == 0)
703                                 width = (size_t)~0;
704                         if (flags & LONG) {
705                                 nr = convert_wstring(fp, GETARG(wchar_t *),
706                                     width, locale);
707                         } else {
708                                 nr = convert_string(fp, GETARG(char *), width,
709                                     locale);
710                         }
711                         if (nr < 0)
712                                 goto input_failure;
713                         break;
714
715                 case CT_INT:
716                         /* scan an integer as if by the conversion function */
717                         if (width == 0 || width > sizeof(buf) /
718                             sizeof(*buf) - 1)
719                                 width = sizeof(buf) / sizeof(*buf) - 1;
720
721                         nr = parseint(fp, buf, width, base, flags, locale);
722                         if (nr == 0)
723                                 goto match_failure;
724                         if ((flags & SUPPRESS) == 0) {
725                                 uintmax_t res;
726
727                                 buf[nr] = L'\0';
728                                 if ((flags & UNSIGNED) == 0)
729                                     res = wcstoimax(buf, NULL, base);
730                                 else
731                                     res = wcstoumax(buf, NULL, base);
732                                 if (flags & POINTER)
733                                         *va_arg(ap, void **) =
734                                                         (void *)(uintptr_t)res;
735                                 else if (flags & SHORTSHORT)
736                                         *va_arg(ap, char *) = res;
737                                 else if (flags & SHORT)
738                                         *va_arg(ap, short *) = res;
739                                 else if (flags & LONG)
740                                         *va_arg(ap, long *) = res;
741                                 else if (flags & LONGLONG)
742                                         *va_arg(ap, long long *) = res;
743                                 else if (flags & INTMAXT)
744                                         *va_arg(ap, intmax_t *) = res;
745                                 else if (flags & PTRDIFFT)
746                                         *va_arg(ap, ptrdiff_t *) = res;
747                                 else if (flags & SIZET)
748                                         *va_arg(ap, size_t *) = res;
749                                 else
750                                         *va_arg(ap, int *) = res;
751                         }
752                         break;
753
754 #ifndef NO_FLOATING_POINT
755                 case CT_FLOAT:
756                         /* scan a floating point number as if by strtod */
757                         if (width == 0 || width > sizeof(buf) /
758                             sizeof(*buf) - 1)
759                                 width = sizeof(buf) / sizeof(*buf) - 1;
760                         nr = parsefloat(fp, buf, buf + width, locale);
761                         if (nr == 0)
762                                 goto match_failure;
763                         if ((flags & SUPPRESS) == 0) {
764                                 if (flags & LONGDBL) {
765                                         long double res = wcstold(buf, NULL);
766                                         *va_arg(ap, long double *) = res;
767                                 } else if (flags & LONG) {
768                                         double res = wcstod(buf, NULL);
769                                         *va_arg(ap, double *) = res;
770                                 } else {
771                                         float res = wcstof(buf, NULL);
772                                         *va_arg(ap, float *) = res;
773                                 }
774                         }
775                         break;
776 #endif /* !NO_FLOATING_POINT */
777                 }
778                 if (!(flags & SUPPRESS))
779                         nassigned++;
780                 nread += nr;
781                 nconversions++;
782         }
783 input_failure:
784         return (nconversions != 0 ? nassigned : EOF);
785 match_failure:
786         return (nassigned);
787 }
788
789 #ifndef NO_FLOATING_POINT
790 static int
791 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end, locale_t locale)
792 {
793         mbstate_t mbs;
794         size_t nconv;
795         wchar_t *commit, *p;
796         int infnanpos = 0;
797         enum {
798                 S_START, S_GOTSIGN, S_INF, S_NAN, S_DONE, S_MAYBEHEX,
799                 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
800         } state = S_START;
801         wchar_t c;
802         wchar_t decpt;
803         _Bool gotmantdig = 0, ishex = 0;
804
805         mbs = initial_mbs;
806         nconv = mbrtowc(&decpt, localeconv()->decimal_point, MB_CUR_MAX, &mbs);
807         if (nconv == (size_t)-1 || nconv == (size_t)-2)
808                 decpt = '.';    /* failsafe */
809
810         /*
811          * We set commit = p whenever the string we have read so far
812          * constitutes a valid representation of a floating point
813          * number by itself.  At some point, the parse will complete
814          * or fail, and we will ungetc() back to the last commit point.
815          * To ensure that the file offset gets updated properly, it is
816          * always necessary to read at least one character that doesn't
817          * match; thus, we can't short-circuit "infinity" or "nan(...)".
818          */
819         commit = buf - 1;
820         c = WEOF;
821         for (p = buf; p < end; ) {
822                 if ((c = __fgetwc(fp, locale)) == WEOF)
823                         break;
824 reswitch:
825                 switch (state) {
826                 case S_START:
827                         state = S_GOTSIGN;
828                         if (c == '-' || c == '+')
829                                 break;
830                         else
831                                 goto reswitch;
832                 case S_GOTSIGN:
833                         switch (c) {
834                         case '0':
835                                 state = S_MAYBEHEX;
836                                 commit = p;
837                                 break;
838                         case 'I':
839                         case 'i':
840                                 state = S_INF;
841                                 break;
842                         case 'N':
843                         case 'n':
844                                 state = S_NAN;
845                                 break;
846                         default:
847                                 state = S_DIGITS;
848                                 goto reswitch;
849                         }
850                         break;
851                 case S_INF:
852                         if (infnanpos > 6 ||
853                             (c != "nfinity"[infnanpos] &&
854                              c != "NFINITY"[infnanpos]))
855                                 goto parsedone;
856                         if (infnanpos == 1 || infnanpos == 6)
857                                 commit = p;     /* inf or infinity */
858                         infnanpos++;
859                         break;
860                 case S_NAN:
861                         switch (infnanpos) {
862                         case 0:
863                                 if (c != 'A' && c != 'a')
864                                         goto parsedone;
865                                 break;
866                         case 1:
867                                 if (c != 'N' && c != 'n')
868                                         goto parsedone;
869                                 else
870                                         commit = p;
871                                 break;
872                         case 2:
873                                 if (c != '(')
874                                         goto parsedone;
875                                 break;
876                         default:
877                                 if (c == ')') {
878                                         commit = p;
879                                         state = S_DONE;
880                                 } else if (!iswalnum(c) && c != '_')
881                                         goto parsedone;
882                                 break;
883                         }
884                         infnanpos++;
885                         break;
886                 case S_DONE:
887                         goto parsedone;
888                 case S_MAYBEHEX:
889                         state = S_DIGITS;
890                         if (c == 'X' || c == 'x') {
891                                 ishex = 1;
892                                 break;
893                         } else {        /* we saw a '0', but no 'x' */
894                                 gotmantdig = 1;
895                                 goto reswitch;
896                         }
897                 case S_DIGITS:
898                         if ((ishex && iswxdigit(c)) || iswdigit(c))
899                                 gotmantdig = 1;
900                         else {
901                                 state = S_FRAC;
902                                 if (c != decpt)
903                                         goto reswitch;
904                         }
905                         if (gotmantdig)
906                                 commit = p;
907                         break;
908                 case S_FRAC:
909                         if (((c == 'E' || c == 'e') && !ishex) ||
910                             ((c == 'P' || c == 'p') && ishex)) {
911                                 if (!gotmantdig)
912                                         goto parsedone;
913                                 else
914                                         state = S_EXP;
915                         } else if ((ishex && iswxdigit(c)) || iswdigit(c)) {
916                                 commit = p;
917                                 gotmantdig = 1;
918                         } else
919                                 goto parsedone;
920                         break;
921                 case S_EXP:
922                         state = S_EXPDIGITS;
923                         if (c == '-' || c == '+')
924                                 break;
925                         else
926                                 goto reswitch;
927                 case S_EXPDIGITS:
928                         if (iswdigit(c))
929                                 commit = p;
930                         else
931                                 goto parsedone;
932                         break;
933                 default:
934                         abort();
935                 }
936                 *p++ = c;
937                 c = WEOF;
938         }
939
940 parsedone:
941         if (c != WEOF)
942                 __ungetwc(c, fp, locale);
943         while (commit < --p)
944                 __ungetwc(*p, fp, locale);
945         *++commit = '\0';
946         return (commit - buf);
947 }
948 #endif