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[FreeBSD/FreeBSD.git] / lib / libc / stdio / vfwscanf.c
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
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  * Copyright (c) 2011 The FreeBSD Foundation
11  * All rights reserved.
12  * Portions of this software were developed by David Chisnall
13  * under sponsorship from the FreeBSD Foundation.
14  *
15  * Redistribution and use in source and binary forms, with or without
16  * modification, are permitted provided that the following conditions
17  * are met:
18  * 1. Redistributions of source code must retain the above copyright
19  *    notice, this list of conditions and the following disclaimer.
20  * 2. Redistributions in binary form must reproduce the above copyright
21  *    notice, this list of conditions and the following disclaimer in the
22  *    documentation and/or other materials provided with the distribution.
23  * 3. Neither the name of the University nor the names of its contributors
24  *    may be used to endorse or promote products derived from this software
25  *    without specific prior written permission.
26  *
27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37  * SUCH DAMAGE.
38  */
39
40 #if 0
41 #if defined(LIBC_SCCS) && !defined(lint)
42 static char sccsid[] = "@(#)vfscanf.c   8.1 (Berkeley) 6/4/93";
43 #endif /* LIBC_SCCS and not lint */
44 #endif
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
47
48 #include "namespace.h"
49 #include <ctype.h>
50 #include <inttypes.h>
51 #include <limits.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <stddef.h>
55 #include <stdarg.h>
56 #include <string.h>
57 #include <wchar.h>
58 #include <wctype.h>
59 #include "un-namespace.h"
60
61 #include "libc_private.h"
62 #include "local.h"
63 #include "xlocale_private.h"
64
65 #define BUF             513     /* Maximum length of numeric string. */
66
67 /*
68  * Flags used during conversion.
69  */
70 #define LONG            0x01    /* l: long or double */
71 #define LONGDBL         0x02    /* L: long double */
72 #define SHORT           0x04    /* h: short */
73 #define SUPPRESS        0x08    /* *: suppress assignment */
74 #define POINTER         0x10    /* p: void * (as hex) */
75 #define NOSKIP          0x20    /* [ or c: do not skip blanks */
76 #define LONGLONG        0x400   /* ll: long long (+ deprecated q: quad) */
77 #define INTMAXT         0x800   /* j: intmax_t */
78 #define PTRDIFFT        0x1000  /* t: ptrdiff_t */
79 #define SIZET           0x2000  /* z: size_t */
80 #define SHORTSHORT      0x4000  /* hh: char */
81 #define UNSIGNED        0x8000  /* %[oupxX] conversions */
82
83 /*
84  * The following are used in integral conversions only:
85  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
86  */
87 #define SIGNOK          0x40    /* +/- is (still) legal */
88 #define NDIGITS         0x80    /* no digits detected */
89 #define PFXOK           0x100   /* 0x prefix is (still) legal */
90 #define NZDIGITS        0x200   /* no zero digits detected */
91 #define HAVESIGN        0x10000 /* sign detected */
92
93 /*
94  * Conversion types.
95  */
96 #define CT_CHAR         0       /* %c conversion */
97 #define CT_CCL          1       /* %[...] conversion */
98 #define CT_STRING       2       /* %s conversion */
99 #define CT_INT          3       /* %[dioupxX] conversion */
100 #define CT_FLOAT        4       /* %[efgEFG] conversion */
101
102 #ifndef NO_FLOATING_POINT
103 static int parsefloat(FILE *, wchar_t *, wchar_t *, locale_t);
104 #endif
105
106 struct ccl {
107         const wchar_t *start;   /* character class start */
108         const wchar_t *end;     /* character class end */
109         int compl;              /* ccl is complemented? */
110 };
111
112 static __inline int
113 inccl(const struct ccl *ccl, wint_t wi)
114 {
115
116         if (ccl->compl) {
117                 return (wmemchr(ccl->start, wi, ccl->end - ccl->start)
118                     == NULL);
119         } else {
120                 return (wmemchr(ccl->start, wi, ccl->end - ccl->start) != NULL);
121         }
122 }
123
124 /*
125  * Conversion functions are passed a pointer to this object instead of
126  * a real parameter to indicate that the assignment-suppression (*)
127  * flag was specified.  We could use a NULL pointer to indicate this,
128  * but that would mask bugs in applications that call scanf() with a
129  * NULL pointer.
130  */
131 static const int suppress;
132 #define SUPPRESS_PTR    ((void *)&suppress)
133
134 static const mbstate_t initial_mbs;
135
136 /*
137  * The following conversion functions return the number of characters consumed,
138  * or -1 on input failure.  Character class conversion returns 0 on match
139  * failure.
140  */
141
142 static __inline int
143 convert_char(FILE *fp, char * mbp, int width, locale_t locale)
144 {
145         mbstate_t mbs;
146         size_t nconv;
147         wint_t wi;
148         int n;
149
150         n = 0;
151         mbs = initial_mbs;
152         while (width-- != 0 && (wi = __fgetwc(fp, locale)) != WEOF) {
153                 if (mbp != SUPPRESS_PTR) {
154                         nconv = wcrtomb(mbp, wi, &mbs);
155                         if (nconv == (size_t)-1)
156                                 return (-1);
157                         mbp += nconv;
158                 }
159                 n++;
160         }
161         if (n == 0)
162                 return (-1);
163         return (n);
164 }
165
166 static __inline int
167 convert_wchar(FILE *fp, wchar_t *wcp, int width, locale_t locale)
168 {
169         wint_t wi;
170         int n;
171
172         n = 0;
173         while (width-- != 0 && (wi = __fgetwc(fp, locale)) != WEOF) {
174                 if (wcp != SUPPRESS_PTR)
175                         *wcp++ = (wchar_t)wi;
176                 n++;
177         }
178         if (n == 0)
179                 return (-1);
180         return (n);
181 }
182
183 static __inline int
184 convert_ccl(FILE *fp, char * mbp, int width, const struct ccl *ccl,
185     locale_t locale)
186 {
187         mbstate_t mbs;
188         size_t nconv;
189         wint_t wi;
190         int n;
191
192         n = 0;
193         mbs = initial_mbs;
194         while ((wi = __fgetwc(fp, locale)) != WEOF &&
195             width-- != 0 && inccl(ccl, wi)) {
196                 if (mbp != SUPPRESS_PTR) {
197                         nconv = wcrtomb(mbp, wi, &mbs);
198                         if (nconv == (size_t)-1)
199                                 return (-1);
200                         mbp += nconv;
201                 }
202                 n++;
203         }
204         if (wi != WEOF)
205                 __ungetwc(wi, fp, locale);
206         if (mbp != SUPPRESS_PTR)
207                 *mbp = 0;
208         return (n);
209 }
210
211 static __inline int
212 convert_wccl(FILE *fp, wchar_t *wcp, int width, const struct ccl *ccl,
213     locale_t locale)
214 {
215         wchar_t *wcp0;
216         wint_t wi;
217         int n;
218
219         if (wcp == SUPPRESS_PTR) {
220                 n = 0;
221                 while ((wi = __fgetwc(fp, locale)) != WEOF &&
222                     width-- != 0 && inccl(ccl, wi))
223                         n++;
224                 if (wi != WEOF)
225                         __ungetwc(wi, fp, locale);
226         } else {
227                 wcp0 = wcp;
228                 while ((wi = __fgetwc(fp, locale)) != WEOF &&
229                     width-- != 0 && inccl(ccl, wi))
230                         *wcp++ = (wchar_t)wi;
231                 if (wi != WEOF)
232                         __ungetwc(wi, fp, locale);
233                 n = wcp - wcp0;
234                 if (n == 0)
235                         return (0);
236                 *wcp = 0;
237         }
238         return (n);
239 }
240
241 static __inline int
242 convert_string(FILE *fp, char * mbp, int width, locale_t locale)
243 {
244         mbstate_t mbs;
245         size_t nconv;
246         wint_t wi;
247         int nread;
248
249         mbs = initial_mbs;
250         nread = 0;
251         while ((wi = __fgetwc(fp, locale)) != WEOF && width-- != 0 &&
252             !iswspace(wi)) {
253                 if (mbp != SUPPRESS_PTR) {
254                         nconv = wcrtomb(mbp, wi, &mbs);
255                         if (nconv == (size_t)-1)
256                                 return (-1);
257                         mbp += nconv;
258                 }
259                 nread++;
260         }
261         if (wi != WEOF)
262                 __ungetwc(wi, fp, locale);
263         if (mbp != SUPPRESS_PTR)
264                 *mbp = 0;
265         return (nread);
266 }
267
268 static __inline int
269 convert_wstring(FILE *fp, wchar_t *wcp, int width, locale_t locale)
270 {
271         wchar_t *wcp0;
272         wint_t wi;
273         int nread;
274
275         nread = 0;
276         if (wcp == SUPPRESS_PTR) {
277                 while ((wi = __fgetwc(fp, locale)) != WEOF &&
278                     width-- != 0 && !iswspace(wi))
279                         nread++;
280                 if (wi != WEOF)
281                         __ungetwc(wi, fp, locale);
282         } else {
283                 wcp0 = wcp;
284                 while ((wi = __fgetwc(fp, locale)) != WEOF &&
285                     width-- != 0 && !iswspace(wi)) {
286                         *wcp++ = (wchar_t)wi;
287                         nread++;
288                 }
289                 if (wi != WEOF)
290                         __ungetwc(wi, fp, locale);
291                 *wcp = '\0';
292         }
293         return (nread);
294 }
295
296 /*
297  * Read an integer, storing it in buf.  The only relevant bit in the
298  * flags argument is PFXOK.
299  *
300  * Return 0 on a match failure, and the number of characters read
301  * otherwise.
302  */
303 static __inline int
304 parseint(FILE *fp, wchar_t *buf, int width, int base, int flags,
305     locale_t locale)
306 {
307         /* `basefix' is used to avoid `if' tests */
308         static const short basefix[17] =
309                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
310         wchar_t *wcp;
311         int c;
312
313         flags |= SIGNOK | NDIGITS | NZDIGITS;
314         for (wcp = buf; width; width--) {
315                 c = __fgetwc(fp, locale);
316                 /*
317                  * Switch on the character; `goto ok' if we accept it
318                  * as a part of number.
319                  */
320                 switch (c) {
321
322                 /*
323                  * The digit 0 is always legal, but is special.  For
324                  * %i conversions, if no digits (zero or nonzero) have
325                  * been scanned (only signs), we will have base==0.
326                  * In that case, we should set it to 8 and enable 0x
327                  * prefixing.  Also, if we have not scanned zero
328                  * digits before this, do not turn off prefixing
329                  * (someone else will turn it off if we have scanned
330                  * any nonzero digits).
331                  */
332                 case '0':
333                         if (base == 0) {
334                                 base = 8;
335                                 flags |= PFXOK;
336                         }
337                         if (flags & NZDIGITS)
338                                 flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
339                         else
340                                 flags &= ~(SIGNOK|PFXOK|NDIGITS);
341                         goto ok;
342
343                 /* 1 through 7 always legal */
344                 case '1': case '2': case '3':
345                 case '4': case '5': case '6': case '7':
346                         base = basefix[base];
347                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
348                         goto ok;
349
350                 /* digits 8 and 9 ok iff decimal or hex */
351                 case '8': case '9':
352                         base = basefix[base];
353                         if (base <= 8)
354                                 break;  /* not legal here */
355                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
356                         goto ok;
357
358                 /* letters ok iff hex */
359                 case 'A': case 'B': case 'C':
360                 case 'D': case 'E': case 'F':
361                 case 'a': case 'b': case 'c':
362                 case 'd': case 'e': case 'f':
363                         /* no need to fix base here */
364                         if (base <= 10)
365                                 break;  /* not legal here */
366                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
367                         goto ok;
368
369                 /* sign ok only as first character */
370                 case '+': case '-':
371                         if (flags & SIGNOK) {
372                                 flags &= ~SIGNOK;
373                                 flags |= HAVESIGN;
374                                 goto ok;
375                         }
376                         break;
377
378                 /*
379                  * x ok iff flag still set & 2nd char (or 3rd char if
380                  * we have a sign).
381                  */
382                 case 'x': case 'X':
383                         if (flags & PFXOK && wcp ==
384                             buf + 1 + !!(flags & HAVESIGN)) {
385                                 base = 16;      /* if %i */
386                                 flags &= ~PFXOK;
387                                 goto ok;
388                         }
389                         break;
390                 }
391
392                 /*
393                  * If we got here, c is not a legal character for a
394                  * number.  Stop accumulating digits.
395                  */
396                 if (c != WEOF)
397                         __ungetwc(c, fp, locale);
398                 break;
399         ok:
400                 /*
401                  * c is legal: store it and look at the next.
402                  */
403                 *wcp++ = (wchar_t)c;
404         }
405         /*
406          * If we had only a sign, it is no good; push back the sign.
407          * If the number ends in `x', it was [sign] '0' 'x', so push
408          * back the x and treat it as [sign] '0'.
409          */
410         if (flags & NDIGITS) {
411                 if (wcp > buf)
412                         __ungetwc(*--wcp, fp, locale);
413                 return (0);
414         }
415         c = wcp[-1];
416         if (c == 'x' || c == 'X') {
417                 --wcp;
418                 __ungetwc(c, fp, locale);
419         }
420         return (wcp - buf);
421 }
422
423 /*
424  * MT-safe version.
425  */
426 int
427 vfwscanf_l(FILE * __restrict fp, locale_t locale,
428                 const wchar_t * __restrict fmt, va_list ap)
429 {
430         int ret;
431         FIX_LOCALE(locale);
432
433         FLOCKFILE_CANCELSAFE(fp);
434         ORIENT(fp, 1);
435         ret = __vfwscanf(fp, locale, fmt, ap);
436         FUNLOCKFILE_CANCELSAFE();
437         return (ret);
438 }
439 int
440 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
441 {
442         return vfwscanf_l(fp, __get_locale(), fmt, ap);
443 }
444
445 /*
446  * Non-MT-safe version.
447  */
448 int
449 __vfwscanf(FILE * __restrict fp, locale_t locale,
450                 const wchar_t * __restrict fmt, va_list ap)
451 {
452 #define GETARG(type)    ((flags & SUPPRESS) ? SUPPRESS_PTR : va_arg(ap, type))
453         wint_t c;               /* character from format, or conversion */
454         size_t width;           /* field width, or 0 */
455         int flags;              /* flags as defined above */
456         int nassigned;          /* number of fields assigned */
457         int nconversions;       /* number of conversions */
458         int nr;                 /* characters read by the current conversion */
459         int nread;              /* number of characters consumed from fp */
460         int base;               /* base argument to conversion function */
461         struct ccl ccl;         /* character class info */
462         wchar_t buf[BUF];       /* buffer for numeric conversions */
463         wint_t wi;              /* handy wint_t */
464
465         nassigned = 0;
466         nconversions = 0;
467         nread = 0;
468         ccl.start = ccl.end = NULL;
469         for (;;) {
470                 c = *fmt++;
471                 if (c == 0)
472                         return (nassigned);
473                 if (iswspace(c)) {
474                         while ((c = __fgetwc(fp, locale)) != WEOF &&
475                             iswspace_l(c, locale))
476                                 nread++;
477                         if (c != WEOF)
478                                 __ungetwc(c, fp, locale);
479                         continue;
480                 }
481                 if (c != '%')
482                         goto literal;
483                 width = 0;
484                 flags = 0;
485                 /*
486                  * switch on the format.  continue if done;
487                  * break once format type is derived.
488                  */
489 again:          c = *fmt++;
490                 switch (c) {
491                 case '%':
492 literal:
493                         if ((wi = __fgetwc(fp, locale)) == WEOF)
494                                 goto input_failure;
495                         if (wi != c) {
496                                 __ungetwc(wi, fp, locale);
497                                 goto match_failure;
498                         }
499                         nread++;
500                         continue;
501
502                 case '*':
503                         flags |= SUPPRESS;
504                         goto again;
505                 case 'j':
506                         flags |= INTMAXT;
507                         goto again;
508                 case 'l':
509                         if (flags & LONG) {
510                                 flags &= ~LONG;
511                                 flags |= LONGLONG;
512                         } else
513                                 flags |= LONG;
514                         goto again;
515                 case 'q':
516                         flags |= LONGLONG;      /* not quite */
517                         goto again;
518                 case 't':
519                         flags |= PTRDIFFT;
520                         goto again;
521                 case 'z':
522                         flags |= SIZET;
523                         goto again;
524                 case 'L':
525                         flags |= LONGDBL;
526                         goto again;
527                 case 'h':
528                         if (flags & SHORT) {
529                                 flags &= ~SHORT;
530                                 flags |= SHORTSHORT;
531                         } else
532                                 flags |= SHORT;
533                         goto again;
534
535                 case '0': case '1': case '2': case '3': case '4':
536                 case '5': case '6': case '7': case '8': case '9':
537                         width = width * 10 + c - '0';
538                         goto again;
539
540                 /*
541                  * Conversions.
542                  */
543                 case 'd':
544                         c = CT_INT;
545                         base = 10;
546                         break;
547
548                 case 'i':
549                         c = CT_INT;
550                         base = 0;
551                         break;
552
553                 case 'o':
554                         c = CT_INT;
555                         flags |= UNSIGNED;
556                         base = 8;
557                         break;
558
559                 case 'u':
560                         c = CT_INT;
561                         flags |= UNSIGNED;
562                         base = 10;
563                         break;
564
565                 case 'X':
566                 case 'x':
567                         flags |= PFXOK; /* enable 0x prefixing */
568                         c = CT_INT;
569                         flags |= UNSIGNED;
570                         base = 16;
571                         break;
572
573 #ifndef NO_FLOATING_POINT
574                 case 'A': case 'E': case 'F': case 'G':
575                 case 'a': case 'e': case 'f': case 'g':
576                         c = CT_FLOAT;
577                         break;
578 #endif
579
580                 case 'S':
581                         flags |= LONG;
582                         /* FALLTHROUGH */
583                 case 's':
584                         c = CT_STRING;
585                         break;
586
587                 case '[':
588                         ccl.start = fmt;
589                         if (*fmt == '^') {
590                                 ccl.compl = 1;
591                                 fmt++;
592                         } else
593                                 ccl.compl = 0;
594                         if (*fmt == ']')
595                                 fmt++;
596                         while (*fmt != '\0' && *fmt != ']')
597                                 fmt++;
598                         ccl.end = fmt;
599                         fmt++;
600                         flags |= NOSKIP;
601                         c = CT_CCL;
602                         break;
603
604                 case 'C':
605                         flags |= LONG;
606                         /* FALLTHROUGH */
607                 case 'c':
608                         flags |= NOSKIP;
609                         c = CT_CHAR;
610                         break;
611
612                 case 'p':       /* pointer format is like hex */
613                         flags |= POINTER | PFXOK;
614                         c = CT_INT;             /* assumes sizeof(uintmax_t) */
615                         flags |= UNSIGNED;      /*      >= sizeof(uintptr_t) */
616                         base = 16;
617                         break;
618
619                 case 'n':
620                         if (flags & SUPPRESS)   /* ??? */
621                                 continue;
622                         if (flags & SHORTSHORT)
623                                 *va_arg(ap, char *) = nread;
624                         else if (flags & SHORT)
625                                 *va_arg(ap, short *) = nread;
626                         else if (flags & LONG)
627                                 *va_arg(ap, long *) = nread;
628                         else if (flags & LONGLONG)
629                                 *va_arg(ap, long long *) = nread;
630                         else if (flags & INTMAXT)
631                                 *va_arg(ap, intmax_t *) = nread;
632                         else if (flags & SIZET)
633                                 *va_arg(ap, size_t *) = nread;
634                         else if (flags & PTRDIFFT)
635                                 *va_arg(ap, ptrdiff_t *) = nread;
636                         else
637                                 *va_arg(ap, int *) = nread;
638                         continue;
639
640                 default:
641                         goto match_failure;
642
643                 /*
644                  * Disgusting backwards compatibility hack.     XXX
645                  */
646                 case '\0':      /* compat */
647                         return (EOF);
648                 }
649
650                 /*
651                  * Consume leading white space, except for formats
652                  * that suppress this.
653                  */
654                 if ((flags & NOSKIP) == 0) {
655                         while ((wi = __fgetwc(fp, locale)) != WEOF && iswspace(wi))
656                                 nread++;
657                         if (wi == WEOF)
658                                 goto input_failure;
659                         __ungetwc(wi, fp, locale);
660                 }
661
662                 /*
663                  * Do the conversion.
664                  */
665                 switch (c) {
666
667                 case CT_CHAR:
668                         /* scan arbitrary characters (sets NOSKIP) */
669                         if (width == 0)
670                                 width = 1;
671                         if (flags & LONG) {
672                                 nr = convert_wchar(fp, GETARG(wchar_t *), width,
673                                     locale);
674                         } else {
675                                 nr = convert_char(fp, GETARG(char *), width,
676                                     locale);
677                         }
678                         if (nr < 0)
679                                 goto input_failure;
680                         break;
681
682                 case CT_CCL:
683                         /* scan a (nonempty) character class (sets NOSKIP) */
684                         if (width == 0)
685                                 width = (size_t)~0;     /* `infinity' */
686                         /* take only those things in the class */
687                         if (flags & LONG) {
688                                 nr = convert_wccl(fp, GETARG(wchar_t *), width,
689                                     &ccl, locale);
690                         } else {
691                                 nr = convert_ccl(fp, GETARG(char *), width,
692                                     &ccl, locale);
693                         }
694                         if (nr <= 0) {
695                                 if (nr < 0)
696                                         goto input_failure;
697                                 else /* nr == 0 */
698                                         goto match_failure;
699                         }
700                         break;
701
702                 case CT_STRING:
703                         /* like CCL, but zero-length string OK, & no NOSKIP */
704                         if (width == 0)
705                                 width = (size_t)~0;
706                         if (flags & LONG) {
707                                 nr = convert_wstring(fp, GETARG(wchar_t *),
708                                     width, locale);
709                         } else {
710                                 nr = convert_string(fp, GETARG(char *), width,
711                                     locale);
712                         }
713                         if (nr < 0)
714                                 goto input_failure;
715                         break;
716
717                 case CT_INT:
718                         /* scan an integer as if by the conversion function */
719                         if (width == 0 || width > sizeof(buf) /
720                             sizeof(*buf) - 1)
721                                 width = sizeof(buf) / sizeof(*buf) - 1;
722
723                         nr = parseint(fp, buf, width, base, flags, locale);
724                         if (nr == 0)
725                                 goto match_failure;
726                         if ((flags & SUPPRESS) == 0) {
727                                 uintmax_t res;
728
729                                 buf[nr] = L'\0';
730                                 if ((flags & UNSIGNED) == 0)
731                                     res = wcstoimax(buf, NULL, base);
732                                 else
733                                     res = wcstoumax(buf, NULL, base);
734                                 if (flags & POINTER)
735                                         *va_arg(ap, void **) =
736                                                         (void *)(uintptr_t)res;
737                                 else if (flags & SHORTSHORT)
738                                         *va_arg(ap, char *) = res;
739                                 else if (flags & SHORT)
740                                         *va_arg(ap, short *) = res;
741                                 else if (flags & LONG)
742                                         *va_arg(ap, long *) = res;
743                                 else if (flags & LONGLONG)
744                                         *va_arg(ap, long long *) = res;
745                                 else if (flags & INTMAXT)
746                                         *va_arg(ap, intmax_t *) = res;
747                                 else if (flags & PTRDIFFT)
748                                         *va_arg(ap, ptrdiff_t *) = res;
749                                 else if (flags & SIZET)
750                                         *va_arg(ap, size_t *) = res;
751                                 else
752                                         *va_arg(ap, int *) = res;
753                         }
754                         break;
755
756 #ifndef NO_FLOATING_POINT
757                 case CT_FLOAT:
758                         /* scan a floating point number as if by strtod */
759                         if (width == 0 || width > sizeof(buf) /
760                             sizeof(*buf) - 1)
761                                 width = sizeof(buf) / sizeof(*buf) - 1;
762                         nr = parsefloat(fp, buf, buf + width, locale);
763                         if (nr == 0)
764                                 goto match_failure;
765                         if ((flags & SUPPRESS) == 0) {
766                                 if (flags & LONGDBL) {
767                                         long double res = wcstold(buf, NULL);
768                                         *va_arg(ap, long double *) = res;
769                                 } else if (flags & LONG) {
770                                         double res = wcstod(buf, NULL);
771                                         *va_arg(ap, double *) = res;
772                                 } else {
773                                         float res = wcstof(buf, NULL);
774                                         *va_arg(ap, float *) = res;
775                                 }
776                         }
777                         break;
778 #endif /* !NO_FLOATING_POINT */
779                 }
780                 if (!(flags & SUPPRESS))
781                         nassigned++;
782                 nread += nr;
783                 nconversions++;
784         }
785 input_failure:
786         return (nconversions != 0 ? nassigned : EOF);
787 match_failure:
788         return (nassigned);
789 }
790
791 #ifndef NO_FLOATING_POINT
792 static int
793 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end, locale_t locale)
794 {
795         mbstate_t mbs;
796         size_t nconv;
797         wchar_t *commit, *p;
798         int infnanpos = 0;
799         enum {
800                 S_START, S_GOTSIGN, S_INF, S_NAN, S_DONE, S_MAYBEHEX,
801                 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
802         } state = S_START;
803         wchar_t c;
804         wchar_t decpt;
805         _Bool gotmantdig = 0, ishex = 0;
806
807         mbs = initial_mbs;
808         nconv = mbrtowc(&decpt, localeconv()->decimal_point, MB_CUR_MAX, &mbs);
809         if (nconv == (size_t)-1 || nconv == (size_t)-2)
810                 decpt = '.';    /* failsafe */
811
812         /*
813          * We set commit = p whenever the string we have read so far
814          * constitutes a valid representation of a floating point
815          * number by itself.  At some point, the parse will complete
816          * or fail, and we will ungetc() back to the last commit point.
817          * To ensure that the file offset gets updated properly, it is
818          * always necessary to read at least one character that doesn't
819          * match; thus, we can't short-circuit "infinity" or "nan(...)".
820          */
821         commit = buf - 1;
822         c = WEOF;
823         for (p = buf; p < end; ) {
824                 if ((c = __fgetwc(fp, locale)) == WEOF)
825                         break;
826 reswitch:
827                 switch (state) {
828                 case S_START:
829                         state = S_GOTSIGN;
830                         if (c == '-' || c == '+')
831                                 break;
832                         else
833                                 goto reswitch;
834                 case S_GOTSIGN:
835                         switch (c) {
836                         case '0':
837                                 state = S_MAYBEHEX;
838                                 commit = p;
839                                 break;
840                         case 'I':
841                         case 'i':
842                                 state = S_INF;
843                                 break;
844                         case 'N':
845                         case 'n':
846                                 state = S_NAN;
847                                 break;
848                         default:
849                                 state = S_DIGITS;
850                                 goto reswitch;
851                         }
852                         break;
853                 case S_INF:
854                         if (infnanpos > 6 ||
855                             (c != "nfinity"[infnanpos] &&
856                              c != "NFINITY"[infnanpos]))
857                                 goto parsedone;
858                         if (infnanpos == 1 || infnanpos == 6)
859                                 commit = p;     /* inf or infinity */
860                         infnanpos++;
861                         break;
862                 case S_NAN:
863                         switch (infnanpos) {
864                         case 0:
865                                 if (c != 'A' && c != 'a')
866                                         goto parsedone;
867                                 break;
868                         case 1:
869                                 if (c != 'N' && c != 'n')
870                                         goto parsedone;
871                                 else
872                                         commit = p;
873                                 break;
874                         case 2:
875                                 if (c != '(')
876                                         goto parsedone;
877                                 break;
878                         default:
879                                 if (c == ')') {
880                                         commit = p;
881                                         state = S_DONE;
882                                 } else if (!iswalnum(c) && c != '_')
883                                         goto parsedone;
884                                 break;
885                         }
886                         infnanpos++;
887                         break;
888                 case S_DONE:
889                         goto parsedone;
890                 case S_MAYBEHEX:
891                         state = S_DIGITS;
892                         if (c == 'X' || c == 'x') {
893                                 ishex = 1;
894                                 break;
895                         } else {        /* we saw a '0', but no 'x' */
896                                 gotmantdig = 1;
897                                 goto reswitch;
898                         }
899                 case S_DIGITS:
900                         if ((ishex && iswxdigit(c)) || iswdigit(c))
901                                 gotmantdig = 1;
902                         else {
903                                 state = S_FRAC;
904                                 if (c != decpt)
905                                         goto reswitch;
906                         }
907                         if (gotmantdig)
908                                 commit = p;
909                         break;
910                 case S_FRAC:
911                         if (((c == 'E' || c == 'e') && !ishex) ||
912                             ((c == 'P' || c == 'p') && ishex)) {
913                                 if (!gotmantdig)
914                                         goto parsedone;
915                                 else
916                                         state = S_EXP;
917                         } else if ((ishex && iswxdigit(c)) || iswdigit(c)) {
918                                 commit = p;
919                                 gotmantdig = 1;
920                         } else
921                                 goto parsedone;
922                         break;
923                 case S_EXP:
924                         state = S_EXPDIGITS;
925                         if (c == '-' || c == '+')
926                                 break;
927                         else
928                                 goto reswitch;
929                 case S_EXPDIGITS:
930                         if (iswdigit(c))
931                                 commit = p;
932                         else
933                                 goto parsedone;
934                         break;
935                 default:
936                         abort();
937                 }
938                 *p++ = c;
939                 c = WEOF;
940         }
941
942 parsedone:
943         if (c != WEOF)
944                 __ungetwc(c, fp, locale);
945         while (commit < --p)
946                 __ungetwc(*p, fp, locale);
947         *++commit = '\0';
948         return (commit - buf);
949 }
950 #endif