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 * Copyright (c) 2011 The FreeBSD Foundation
8 * All rights reserved.
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
11 *
12 * This code is derived from software contributed to Berkeley by
13 * Chris Torek.
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 defined(LIBC_SCCS) && !defined(lint)
41 static char sccsid[] = "@(#)vfscanf.c 8.1 (Berkeley) 6/4/93";
42 #endif /* LIBC_SCCS and not lint */
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
45
46 #include "namespace.h"
47 #include <ctype.h>
48 #include <inttypes.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <stddef.h>
52 #include <stdarg.h>
53 #include <string.h>
54 #include <wchar.h>
55 #include <wctype.h>
56 #include "un-namespace.h"
57
58 #include "collate.h"
59 #include "libc_private.h"
60 #include "local.h"
61 #include "xlocale_private.h"
62
63 #ifndef NO_FLOATING_POINT
64 #include <locale.h>
65 #endif
66
67 #define BUF 513 /* Maximum length of numeric string. */
68
69 /*
70 * Flags used during conversion.
71 */
72 #define LONG 0x01 /* l: long or double */
73 #define LONGDBL 0x02 /* L: long double */
74 #define SHORT 0x04 /* h: short */
75 #define SUPPRESS 0x08 /* *: suppress assignment */
76 #define POINTER 0x10 /* p: void * (as hex) */
77 #define NOSKIP 0x20 /* [ or c: do not skip blanks */
78 #define LONGLONG 0x400 /* ll: long long (+ deprecated q: quad) */
79 #define INTMAXT 0x800 /* j: intmax_t */
80 #define PTRDIFFT 0x1000 /* t: ptrdiff_t */
81 #define SIZET 0x2000 /* z: size_t */
82 #define SHORTSHORT 0x4000 /* hh: char */
83 #define UNSIGNED 0x8000 /* %[oupxX] conversions */
84
85 /*
86 * The following are used in integral conversions only:
87 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
88 */
89 #define SIGNOK 0x40 /* +/- is (still) legal */
90 #define NDIGITS 0x80 /* no digits detected */
91 #define PFXOK 0x100 /* 0x prefix is (still) legal */
92 #define NZDIGITS 0x200 /* no zero digits detected */
93 #define HAVESIGN 0x10000 /* sign detected */
94
95 /*
96 * Conversion types.
97 */
98 #define CT_CHAR 0 /* %c conversion */
99 #define CT_CCL 1 /* %[...] conversion */
100 #define CT_STRING 2 /* %s conversion */
101 #define CT_INT 3 /* %[dioupxX] conversion */
102 #define CT_FLOAT 4 /* %[efgEFG] conversion */
103
104 static const u_char *__sccl(char *, const u_char *);
105 #ifndef NO_FLOATING_POINT
106 static int parsefloat(FILE *, char *, char *, locale_t);
107 #endif
108
109 __weak_reference(__vfscanf, vfscanf);
110
111 /*
112 * Conversion functions are passed a pointer to this object instead of
113 * a real parameter to indicate that the assignment-suppression (*)
114 * flag was specified. We could use a NULL pointer to indicate this,
115 * but that would mask bugs in applications that call scanf() with a
116 * NULL pointer.
117 */
118 static const int suppress;
119 #define SUPPRESS_PTR ((void *)&suppress)
120
121 static const mbstate_t initial_mbs;
122
123 /*
124 * The following conversion functions return the number of characters consumed,
125 * or -1 on input failure. Character class conversion returns 0 on match
126 * failure.
127 */
128
129 static __inline int
convert_char(FILE * fp,char * p,int width)130 convert_char(FILE *fp, char * p, int width)
131 {
132 int n;
133
134 if (p == SUPPRESS_PTR) {
135 size_t sum = 0;
136 for (;;) {
137 if ((n = fp->_r) < width) {
138 sum += n;
139 width -= n;
140 fp->_p += n;
141 if (__srefill(fp)) {
142 if (sum == 0)
143 return (-1);
144 break;
145 }
146 } else {
147 sum += width;
148 fp->_r -= width;
149 fp->_p += width;
150 break;
151 }
152 }
153 return (sum);
154 } else {
155 size_t r = __fread(p, 1, width, fp);
156
157 if (r == 0)
158 return (-1);
159 return (r);
160 }
161 }
162
163 static __inline int
convert_wchar(FILE * fp,wchar_t * wcp,int width,locale_t locale)164 convert_wchar(FILE *fp, wchar_t *wcp, int width, locale_t locale)
165 {
166 mbstate_t mbs;
167 int n, nread;
168 wint_t wi;
169
170 mbs = initial_mbs;
171 n = 0;
172 while (width-- != 0 &&
173 (wi = __fgetwc_mbs(fp, &mbs, &nread, locale)) != WEOF) {
174 if (wcp != SUPPRESS_PTR)
175 *wcp++ = (wchar_t)wi;
176 n += nread;
177 }
178 if (n == 0)
179 return (-1);
180 return (n);
181 }
182
183 static __inline int
convert_ccl(FILE * fp,char * p,int width,const char * ccltab)184 convert_ccl(FILE *fp, char * p, int width, const char *ccltab)
185 {
186 char *p0;
187 int n;
188
189 if (p == SUPPRESS_PTR) {
190 n = 0;
191 while (ccltab[*fp->_p]) {
192 n++, fp->_r--, fp->_p++;
193 if (--width == 0)
194 break;
195 if (fp->_r <= 0 && __srefill(fp)) {
196 if (n == 0)
197 return (-1);
198 break;
199 }
200 }
201 } else {
202 p0 = p;
203 while (ccltab[*fp->_p]) {
204 fp->_r--;
205 *p++ = *fp->_p++;
206 if (--width == 0)
207 break;
208 if (fp->_r <= 0 && __srefill(fp)) {
209 if (p == p0)
210 return (-1);
211 break;
212 }
213 }
214 n = p - p0;
215 if (n == 0)
216 return (0);
217 *p = 0;
218 }
219 return (n);
220 }
221
222 static __inline int
convert_wccl(FILE * fp,wchar_t * wcp,int width,const char * ccltab,locale_t locale)223 convert_wccl(FILE *fp, wchar_t *wcp, int width, const char *ccltab,
224 locale_t locale)
225 {
226 mbstate_t mbs;
227 wint_t wi;
228 int n, nread;
229
230 mbs = initial_mbs;
231 n = 0;
232 if (wcp == SUPPRESS_PTR) {
233 while ((wi = __fgetwc_mbs(fp, &mbs, &nread, locale)) != WEOF &&
234 width-- != 0 && ccltab[wctob(wi)])
235 n += nread;
236 if (wi != WEOF)
237 __ungetwc(wi, fp, __get_locale());
238 } else {
239 while ((wi = __fgetwc_mbs(fp, &mbs, &nread, locale)) != WEOF &&
240 width-- != 0 && ccltab[wctob(wi)]) {
241 *wcp++ = (wchar_t)wi;
242 n += nread;
243 }
244 if (wi != WEOF)
245 __ungetwc(wi, fp, __get_locale());
246 if (n == 0)
247 return (0);
248 *wcp = 0;
249 }
250 return (n);
251 }
252
253 static __inline int
convert_string(FILE * fp,char * p,int width)254 convert_string(FILE *fp, char * p, int width)
255 {
256 char *p0;
257 int n;
258
259 if (p == SUPPRESS_PTR) {
260 n = 0;
261 while (!isspace(*fp->_p)) {
262 n++, fp->_r--, fp->_p++;
263 if (--width == 0)
264 break;
265 if (fp->_r <= 0 && __srefill(fp))
266 break;
267 }
268 } else {
269 p0 = p;
270 while (!isspace(*fp->_p)) {
271 fp->_r--;
272 *p++ = *fp->_p++;
273 if (--width == 0)
274 break;
275 if (fp->_r <= 0 && __srefill(fp))
276 break;
277 }
278 *p = 0;
279 n = p - p0;
280 }
281 return (n);
282 }
283
284 static __inline int
convert_wstring(FILE * fp,wchar_t * wcp,int width,locale_t locale)285 convert_wstring(FILE *fp, wchar_t *wcp, int width, locale_t locale)
286 {
287 mbstate_t mbs;
288 wint_t wi;
289 int n, nread;
290
291 mbs = initial_mbs;
292 n = 0;
293 if (wcp == SUPPRESS_PTR) {
294 while ((wi = __fgetwc_mbs(fp, &mbs, &nread, locale)) != WEOF &&
295 width-- != 0 && !iswspace(wi))
296 n += nread;
297 if (wi != WEOF)
298 __ungetwc(wi, fp, __get_locale());
299 } else {
300 while ((wi = __fgetwc_mbs(fp, &mbs, &nread, locale)) != WEOF &&
301 width-- != 0 && !iswspace(wi)) {
302 *wcp++ = (wchar_t)wi;
303 n += nread;
304 }
305 if (wi != WEOF)
306 __ungetwc(wi, fp, __get_locale());
307 *wcp = '\0';
308 }
309 return (n);
310 }
311
312 /*
313 * Read an integer, storing it in buf. The only relevant bit in the
314 * flags argument is PFXOK.
315 *
316 * Return 0 on a match failure, and the number of characters read
317 * otherwise.
318 */
319 static __inline int
parseint(FILE * fp,char * __restrict buf,int width,int base,int flags)320 parseint(FILE *fp, char * __restrict buf, int width, int base, int flags)
321 {
322 /* `basefix' is used to avoid `if' tests */
323 static const short basefix[17] =
324 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
325 char *p;
326 int c;
327
328 flags |= SIGNOK | NDIGITS | NZDIGITS;
329 for (p = buf; width; width--) {
330 c = *fp->_p;
331 /*
332 * Switch on the character; `goto ok' if we accept it
333 * as a part of number.
334 */
335 switch (c) {
336
337 /*
338 * The digit 0 is always legal, but is special. For
339 * %i conversions, if no digits (zero or nonzero) have
340 * been scanned (only signs), we will have base==0.
341 * In that case, we should set it to 8 and enable 0x
342 * prefixing. Also, if we have not scanned zero
343 * digits before this, do not turn off prefixing
344 * (someone else will turn it off if we have scanned
345 * any nonzero digits).
346 */
347 case '0':
348 if (base == 0) {
349 base = 8;
350 flags |= PFXOK;
351 }
352 if (flags & NZDIGITS)
353 flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
354 else
355 flags &= ~(SIGNOK|PFXOK|NDIGITS);
356 goto ok;
357
358 /* 1 through 7 always legal */
359 case '1': case '2': case '3':
360 case '4': case '5': case '6': case '7':
361 base = basefix[base];
362 flags &= ~(SIGNOK | PFXOK | NDIGITS);
363 goto ok;
364
365 /* digits 8 and 9 ok iff decimal or hex */
366 case '8': case '9':
367 base = basefix[base];
368 if (base <= 8)
369 break; /* not legal here */
370 flags &= ~(SIGNOK | PFXOK | NDIGITS);
371 goto ok;
372
373 /* letters ok iff hex */
374 case 'A': case 'B': case 'C':
375 case 'D': case 'E': case 'F':
376 case 'a': case 'b': case 'c':
377 case 'd': case 'e': case 'f':
378 /* no need to fix base here */
379 if (base <= 10)
380 break; /* not legal here */
381 flags &= ~(SIGNOK | PFXOK | NDIGITS);
382 goto ok;
383
384 /* sign ok only as first character */
385 case '+': case '-':
386 if (flags & SIGNOK) {
387 flags &= ~SIGNOK;
388 flags |= HAVESIGN;
389 goto ok;
390 }
391 break;
392
393 /*
394 * x ok iff flag still set & 2nd char (or 3rd char if
395 * we have a sign).
396 */
397 case 'x': case 'X':
398 if (flags & PFXOK && p ==
399 buf + 1 + !!(flags & HAVESIGN)) {
400 base = 16; /* if %i */
401 flags &= ~PFXOK;
402 goto ok;
403 }
404 break;
405 }
406
407 /*
408 * If we got here, c is not a legal character for a
409 * number. Stop accumulating digits.
410 */
411 break;
412 ok:
413 /*
414 * c is legal: store it and look at the next.
415 */
416 *p++ = c;
417 if (--fp->_r > 0)
418 fp->_p++;
419 else if (__srefill(fp))
420 break; /* EOF */
421 }
422 /*
423 * If we had only a sign, it is no good; push back the sign.
424 * If the number ends in `x', it was [sign] '0' 'x', so push
425 * back the x and treat it as [sign] '0'.
426 */
427 if (flags & NDIGITS) {
428 if (p > buf)
429 (void) __ungetc(*(u_char *)--p, fp);
430 return (0);
431 }
432 c = ((u_char *)p)[-1];
433 if (c == 'x' || c == 'X') {
434 --p;
435 (void) __ungetc(c, fp);
436 }
437 return (p - buf);
438 }
439
440 /*
441 * __vfscanf - MT-safe version
442 */
443 int
__vfscanf(FILE * fp,char const * fmt0,va_list ap)444 __vfscanf(FILE *fp, char const *fmt0, va_list ap)
445 {
446 int ret;
447
448 FLOCKFILE_CANCELSAFE(fp);
449 ret = __svfscanf(fp, __get_locale(), fmt0, ap);
450 FUNLOCKFILE_CANCELSAFE();
451 return (ret);
452 }
453 int
vfscanf_l(FILE * fp,locale_t locale,char const * fmt0,va_list ap)454 vfscanf_l(FILE *fp, locale_t locale, char const *fmt0, va_list ap)
455 {
456 int ret;
457 FIX_LOCALE(locale);
458
459 FLOCKFILE_CANCELSAFE(fp);
460 ret = __svfscanf(fp, locale, fmt0, ap);
461 FUNLOCKFILE_CANCELSAFE();
462 return (ret);
463 }
464
465 /*
466 * __svfscanf - non-MT-safe version of __vfscanf
467 */
468 int
__svfscanf(FILE * fp,locale_t locale,const char * fmt0,va_list ap)469 __svfscanf(FILE *fp, locale_t locale, const char *fmt0, va_list ap)
470 {
471 #define GETARG(type) ((flags & SUPPRESS) ? SUPPRESS_PTR : va_arg(ap, type))
472 const u_char *fmt = (const u_char *)fmt0;
473 int c; /* character from format, or conversion */
474 size_t width; /* field width, or 0 */
475 int flags; /* flags as defined above */
476 int nassigned; /* number of fields assigned */
477 int nconversions; /* number of conversions */
478 int nr; /* characters read by the current conversion */
479 int nread; /* number of characters consumed from fp */
480 int base; /* base argument to conversion function */
481 char ccltab[256]; /* character class table for %[...] */
482 char buf[BUF]; /* buffer for numeric conversions */
483
484 ORIENT(fp, -1);
485
486 nassigned = 0;
487 nconversions = 0;
488 nread = 0;
489 for (;;) {
490 c = *fmt++;
491 if (c == 0)
492 return (nassigned);
493 if (isspace(c)) {
494 while ((fp->_r > 0 || __srefill(fp) == 0) && isspace(*fp->_p))
495 nread++, fp->_r--, fp->_p++;
496 continue;
497 }
498 if (c != '%')
499 goto literal;
500 width = 0;
501 flags = 0;
502 /*
503 * switch on the format. continue if done;
504 * break once format type is derived.
505 */
506 again: c = *fmt++;
507 switch (c) {
508 case '%':
509 literal:
510 if (fp->_r <= 0 && __srefill(fp))
511 goto input_failure;
512 if (*fp->_p != c)
513 goto match_failure;
514 fp->_r--, fp->_p++;
515 nread++;
516 continue;
517
518 case '*':
519 flags |= SUPPRESS;
520 goto again;
521 case 'j':
522 flags |= INTMAXT;
523 goto again;
524 case 'l':
525 if (flags & LONG) {
526 flags &= ~LONG;
527 flags |= LONGLONG;
528 } else
529 flags |= LONG;
530 goto again;
531 case 'q':
532 flags |= LONGLONG; /* not quite */
533 goto again;
534 case 't':
535 flags |= PTRDIFFT;
536 goto again;
537 case 'z':
538 flags |= SIZET;
539 goto again;
540 case 'L':
541 flags |= LONGDBL;
542 goto again;
543 case 'h':
544 if (flags & SHORT) {
545 flags &= ~SHORT;
546 flags |= SHORTSHORT;
547 } else
548 flags |= SHORT;
549 goto again;
550
551 case '0': case '1': case '2': case '3': case '4':
552 case '5': case '6': case '7': case '8': case '9':
553 width = width * 10 + c - '0';
554 goto again;
555
556 /*
557 * Conversions.
558 */
559 case 'd':
560 c = CT_INT;
561 base = 10;
562 break;
563
564 case 'i':
565 c = CT_INT;
566 base = 0;
567 break;
568
569 case 'o':
570 c = CT_INT;
571 flags |= UNSIGNED;
572 base = 8;
573 break;
574
575 case 'u':
576 c = CT_INT;
577 flags |= UNSIGNED;
578 base = 10;
579 break;
580
581 case 'X':
582 case 'x':
583 flags |= PFXOK; /* enable 0x prefixing */
584 c = CT_INT;
585 flags |= UNSIGNED;
586 base = 16;
587 break;
588
589 #ifndef NO_FLOATING_POINT
590 case 'A': case 'E': case 'F': case 'G':
591 case 'a': case 'e': case 'f': case 'g':
592 c = CT_FLOAT;
593 break;
594 #endif
595
596 case 'S':
597 flags |= LONG;
598 /* FALLTHROUGH */
599 case 's':
600 c = CT_STRING;
601 break;
602
603 case '[':
604 fmt = __sccl(ccltab, fmt);
605 flags |= NOSKIP;
606 c = CT_CCL;
607 break;
608
609 case 'C':
610 flags |= LONG;
611 /* FALLTHROUGH */
612 case 'c':
613 flags |= NOSKIP;
614 c = CT_CHAR;
615 break;
616
617 case 'p': /* pointer format is like hex */
618 flags |= POINTER | PFXOK;
619 c = CT_INT; /* assumes sizeof(uintmax_t) */
620 flags |= UNSIGNED; /* >= sizeof(uintptr_t) */
621 base = 16;
622 break;
623
624 case 'n':
625 if (flags & SUPPRESS) /* ??? */
626 continue;
627 if (flags & SHORTSHORT)
628 *va_arg(ap, char *) = nread;
629 else if (flags & SHORT)
630 *va_arg(ap, short *) = nread;
631 else if (flags & LONG)
632 *va_arg(ap, long *) = nread;
633 else if (flags & LONGLONG)
634 *va_arg(ap, long long *) = nread;
635 else if (flags & INTMAXT)
636 *va_arg(ap, intmax_t *) = nread;
637 else if (flags & SIZET)
638 *va_arg(ap, size_t *) = nread;
639 else if (flags & PTRDIFFT)
640 *va_arg(ap, ptrdiff_t *) = nread;
641 else
642 *va_arg(ap, int *) = nread;
643 continue;
644
645 default:
646 goto match_failure;
647
648 /*
649 * Disgusting backwards compatibility hack. XXX
650 */
651 case '\0': /* compat */
652 return (EOF);
653 }
654
655 /*
656 * We have a conversion that requires input.
657 */
658 if (fp->_r <= 0 && __srefill(fp))
659 goto input_failure;
660
661 /*
662 * Consume leading white space, except for formats
663 * that suppress this.
664 */
665 if ((flags & NOSKIP) == 0) {
666 while (isspace(*fp->_p)) {
667 nread++;
668 if (--fp->_r > 0)
669 fp->_p++;
670 else if (__srefill(fp))
671 goto input_failure;
672 }
673 /*
674 * Note that there is at least one character in
675 * the buffer, so conversions that do not set NOSKIP
676 * ca no longer result in an input failure.
677 */
678 }
679
680 /*
681 * Do the conversion.
682 */
683 switch (c) {
684
685 case CT_CHAR:
686 /* scan arbitrary characters (sets NOSKIP) */
687 if (width == 0)
688 width = 1;
689 if (flags & LONG) {
690 nr = convert_wchar(fp, GETARG(wchar_t *),
691 width, locale);
692 } else {
693 nr = convert_char(fp, GETARG(char *), width);
694 }
695 if (nr < 0)
696 goto input_failure;
697 break;
698
699 case CT_CCL:
700 /* scan a (nonempty) character class (sets NOSKIP) */
701 if (width == 0)
702 width = (size_t)~0; /* `infinity' */
703 if (flags & LONG) {
704 nr = convert_wccl(fp, GETARG(wchar_t *), width,
705 ccltab, locale);
706 } else {
707 nr = convert_ccl(fp, GETARG(char *), width,
708 ccltab);
709 }
710 if (nr <= 0) {
711 if (nr < 0)
712 goto input_failure;
713 else /* nr == 0 */
714 goto match_failure;
715 }
716 break;
717
718 case CT_STRING:
719 /* like CCL, but zero-length string OK, & no NOSKIP */
720 if (width == 0)
721 width = (size_t)~0;
722 if (flags & LONG) {
723 nr = convert_wstring(fp, GETARG(wchar_t *),
724 width, locale);
725 } else {
726 nr = convert_string(fp, GETARG(char *), width);
727 }
728 if (nr < 0)
729 goto input_failure;
730 break;
731
732 case CT_INT:
733 /* scan an integer as if by the conversion function */
734 #ifdef hardway
735 if (width == 0 || width > sizeof(buf) - 1)
736 width = sizeof(buf) - 1;
737 #else
738 /* size_t is unsigned, hence this optimisation */
739 if (--width > sizeof(buf) - 2)
740 width = sizeof(buf) - 2;
741 width++;
742 #endif
743 nr = parseint(fp, buf, width, base, flags);
744 if (nr == 0)
745 goto match_failure;
746 if ((flags & SUPPRESS) == 0) {
747 uintmax_t res;
748
749 buf[nr] = '\0';
750 if ((flags & UNSIGNED) == 0)
751 res = strtoimax_l(buf, (char **)NULL, base, locale);
752 else
753 res = strtoumax_l(buf, (char **)NULL, base, locale);
754 if (flags & POINTER)
755 *va_arg(ap, void **) =
756 (void *)(uintptr_t)res;
757 else if (flags & SHORTSHORT)
758 *va_arg(ap, char *) = res;
759 else if (flags & SHORT)
760 *va_arg(ap, short *) = res;
761 else if (flags & LONG)
762 *va_arg(ap, long *) = res;
763 else if (flags & LONGLONG)
764 *va_arg(ap, long long *) = res;
765 else if (flags & INTMAXT)
766 *va_arg(ap, intmax_t *) = res;
767 else if (flags & PTRDIFFT)
768 *va_arg(ap, ptrdiff_t *) = res;
769 else if (flags & SIZET)
770 *va_arg(ap, size_t *) = res;
771 else
772 *va_arg(ap, int *) = res;
773 }
774 break;
775
776 #ifndef NO_FLOATING_POINT
777 case CT_FLOAT:
778 /* scan a floating point number as if by strtod */
779 if (width == 0 || width > sizeof(buf) - 1)
780 width = sizeof(buf) - 1;
781 nr = parsefloat(fp, buf, buf + width, locale);
782 if (nr == 0)
783 goto match_failure;
784 if ((flags & SUPPRESS) == 0) {
785 if (flags & LONGDBL) {
786 long double res = strtold_l(buf, NULL,
787 locale);
788 *va_arg(ap, long double *) = res;
789 } else if (flags & LONG) {
790 double res = strtod_l(buf, NULL,
791 locale);
792 *va_arg(ap, double *) = res;
793 } else {
794 float res = strtof_l(buf, NULL, locale);
795 *va_arg(ap, float *) = res;
796 }
797 }
798 break;
799 #endif /* !NO_FLOATING_POINT */
800 }
801 if (!(flags & SUPPRESS))
802 nassigned++;
803 nread += nr;
804 nconversions++;
805 }
806 input_failure:
807 return (nconversions != 0 ? nassigned : EOF);
808 match_failure:
809 return (nassigned);
810 }
811
812 /*
813 * Fill in the given table from the scanset at the given format
814 * (just after `['). Return a pointer to the character past the
815 * closing `]'. The table has a 1 wherever characters should be
816 * considered part of the scanset.
817 */
818 static const u_char *
__sccl(char * tab,const u_char * fmt)819 __sccl(char *tab, const u_char *fmt)
820 {
821 int c, n, v, i;
822 struct xlocale_collate *table =
823 (struct xlocale_collate*)__get_locale()->components[XLC_COLLATE];
824
825 /* first `clear' the whole table */
826 c = *fmt++; /* first char hat => negated scanset */
827 if (c == '^') {
828 v = 1; /* default => accept */
829 c = *fmt++; /* get new first char */
830 } else
831 v = 0; /* default => reject */
832
833 /* XXX: Will not work if sizeof(tab*) > sizeof(char) */
834 (void) memset(tab, v, 256);
835
836 if (c == 0)
837 return (fmt - 1);/* format ended before closing ] */
838
839 /*
840 * Now set the entries corresponding to the actual scanset
841 * to the opposite of the above.
842 *
843 * The first character may be ']' (or '-') without being special;
844 * the last character may be '-'.
845 */
846 v = 1 - v;
847 for (;;) {
848 tab[c] = v; /* take character c */
849 doswitch:
850 n = *fmt++; /* and examine the next */
851 switch (n) {
852
853 case 0: /* format ended too soon */
854 return (fmt - 1);
855
856 case '-':
857 /*
858 * A scanset of the form
859 * [01+-]
860 * is defined as `the digit 0, the digit 1,
861 * the character +, the character -', but
862 * the effect of a scanset such as
863 * [a-zA-Z0-9]
864 * is implementation defined. The V7 Unix
865 * scanf treats `a-z' as `the letters a through
866 * z', but treats `a-a' as `the letter a, the
867 * character -, and the letter a'.
868 *
869 * For compatibility, the `-' is not considered
870 * to define a range if the character following
871 * it is either a close bracket (required by ANSI)
872 * or is not numerically greater than the character
873 * we just stored in the table (c).
874 */
875 n = *fmt;
876 if (n == ']'
877 || (table->__collate_load_error ? n < c :
878 __collate_range_cmp(n, c) < 0
879 )
880 ) {
881 c = '-';
882 break; /* resume the for(;;) */
883 }
884 fmt++;
885 /* fill in the range */
886 if (table->__collate_load_error) {
887 do {
888 tab[++c] = v;
889 } while (c < n);
890 } else {
891 for (i = 0; i < 256; i ++)
892 if (__collate_range_cmp(c, i) <= 0 &&
893 __collate_range_cmp(i, n) <= 0
894 )
895 tab[i] = v;
896 }
897 #if 1 /* XXX another disgusting compatibility hack */
898 c = n;
899 /*
900 * Alas, the V7 Unix scanf also treats formats
901 * such as [a-c-e] as `the letters a through e'.
902 * This too is permitted by the standard....
903 */
904 goto doswitch;
905 #else
906 c = *fmt++;
907 if (c == 0)
908 return (fmt - 1);
909 if (c == ']')
910 return (fmt);
911 #endif
912 break;
913
914 case ']': /* end of scanset */
915 return (fmt);
916
917 default: /* just another character */
918 c = n;
919 break;
920 }
921 }
922 /* NOTREACHED */
923 }
924
925 #ifndef NO_FLOATING_POINT
926 static int
parsefloat(FILE * fp,char * buf,char * end,locale_t locale)927 parsefloat(FILE *fp, char *buf, char *end, locale_t locale)
928 {
929 char *commit, *p;
930 int infnanpos = 0, decptpos = 0;
931 enum {
932 S_START, S_GOTSIGN, S_INF, S_NAN, S_DONE, S_MAYBEHEX,
933 S_DIGITS, S_DECPT, S_FRAC, S_EXP, S_EXPDIGITS
934 } state = S_START;
935 unsigned char c;
936 const char *decpt = localeconv_l(locale)->decimal_point;
937 _Bool gotmantdig = 0, ishex = 0;
938
939 /*
940 * We set commit = p whenever the string we have read so far
941 * constitutes a valid representation of a floating point
942 * number by itself. At some point, the parse will complete
943 * or fail, and we will ungetc() back to the last commit point.
944 * To ensure that the file offset gets updated properly, it is
945 * always necessary to read at least one character that doesn't
946 * match; thus, we can't short-circuit "infinity" or "nan(...)".
947 */
948 commit = buf - 1;
949 for (p = buf; p < end; ) {
950 c = *fp->_p;
951 reswitch:
952 switch (state) {
953 case S_START:
954 state = S_GOTSIGN;
955 if (c == '-' || c == '+')
956 break;
957 else
958 goto reswitch;
959 case S_GOTSIGN:
960 switch (c) {
961 case '0':
962 state = S_MAYBEHEX;
963 commit = p;
964 break;
965 case 'I':
966 case 'i':
967 state = S_INF;
968 break;
969 case 'N':
970 case 'n':
971 state = S_NAN;
972 break;
973 default:
974 state = S_DIGITS;
975 goto reswitch;
976 }
977 break;
978 case S_INF:
979 if (infnanpos > 6 ||
980 (c != "nfinity"[infnanpos] &&
981 c != "NFINITY"[infnanpos]))
982 goto parsedone;
983 if (infnanpos == 1 || infnanpos == 6)
984 commit = p; /* inf or infinity */
985 infnanpos++;
986 break;
987 case S_NAN:
988 switch (infnanpos) {
989 case 0:
990 if (c != 'A' && c != 'a')
991 goto parsedone;
992 break;
993 case 1:
994 if (c != 'N' && c != 'n')
995 goto parsedone;
996 else
997 commit = p;
998 break;
999 case 2:
1000 if (c != '(')
1001 goto parsedone;
1002 break;
1003 default:
1004 if (c == ')') {
1005 commit = p;
1006 state = S_DONE;
1007 } else if (!isalnum(c) && c != '_')
1008 goto parsedone;
1009 break;
1010 }
1011 infnanpos++;
1012 break;
1013 case S_DONE:
1014 goto parsedone;
1015 case S_MAYBEHEX:
1016 state = S_DIGITS;
1017 if (c == 'X' || c == 'x') {
1018 ishex = 1;
1019 break;
1020 } else { /* we saw a '0', but no 'x' */
1021 gotmantdig = 1;
1022 goto reswitch;
1023 }
1024 case S_DIGITS:
1025 if ((ishex && isxdigit(c)) || isdigit(c)) {
1026 gotmantdig = 1;
1027 commit = p;
1028 break;
1029 } else {
1030 state = S_DECPT;
1031 goto reswitch;
1032 }
1033 case S_DECPT:
1034 if (c == decpt[decptpos]) {
1035 if (decpt[++decptpos] == '\0') {
1036 /* We read the complete decpt seq. */
1037 state = S_FRAC;
1038 if (gotmantdig)
1039 commit = p;
1040 }
1041 break;
1042 } else if (!decptpos) {
1043 /* We didn't read any decpt characters. */
1044 state = S_FRAC;
1045 goto reswitch;
1046 } else {
1047 /*
1048 * We read part of a multibyte decimal point,
1049 * but the rest is invalid, so bail.
1050 */
1051 goto parsedone;
1052 }
1053 case S_FRAC:
1054 if (((c == 'E' || c == 'e') && !ishex) ||
1055 ((c == 'P' || c == 'p') && ishex)) {
1056 if (!gotmantdig)
1057 goto parsedone;
1058 else
1059 state = S_EXP;
1060 } else if ((ishex && isxdigit(c)) || isdigit(c)) {
1061 commit = p;
1062 gotmantdig = 1;
1063 } else
1064 goto parsedone;
1065 break;
1066 case S_EXP:
1067 state = S_EXPDIGITS;
1068 if (c == '-' || c == '+')
1069 break;
1070 else
1071 goto reswitch;
1072 case S_EXPDIGITS:
1073 if (isdigit(c))
1074 commit = p;
1075 else
1076 goto parsedone;
1077 break;
1078 default:
1079 abort();
1080 }
1081 *p++ = c;
1082 if (--fp->_r > 0)
1083 fp->_p++;
1084 else if (__srefill(fp))
1085 break; /* EOF */
1086 }
1087
1088 parsedone:
1089 while (commit < --p)
1090 __ungetc(*(u_char *)p, fp);
1091 *++commit = '\0';
1092 return (commit - buf);
1093 }
1094 #endif
1095