1 /* $NetBSD: vfwscanf.c,v 1.2 2005/06/12 05:48:41 lukem Exp $ */
2 /* $DragonFly: src/lib/libc/stdio/vfwscanf.c,v 1.1 2005/07/25 00:37:41 joerg Exp $ */
5 * Copyright (c) 1990, 1993
6 * The Regents of the University of California. All rights reserved.
8 * This code is derived from software contributed to Berkeley by
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. 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.
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
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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
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36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 #include "namespace.h"
51 #include "un-namespace.h"
53 #include "libc_private.h"
55 #include "priv_stdio.h"
57 #ifndef NO_FLOATING_POINT
61 #define BUF 513 /* Maximum length of numeric string. */
64 * Flags used during conversion.
66 #define LONG 0x01 /* l: long or double */
67 #define LONGDBL 0x02 /* L: long double */
68 #define SHORT 0x04 /* h: short */
69 #define SUPPRESS 0x08 /* *: suppress assignment */
70 #define POINTER 0x10 /* p: void * (as hex) */
71 #define NOSKIP 0x20 /* [ or c: do not skip blanks */
72 #define LONGLONG 0x400 /* ll: quad_t (+ deprecated q: quad) */
73 #define INTMAXT 0x800 /* j: intmax_t */
74 #define PTRDIFFT 0x1000 /* t: ptrdiff_t */
75 #define SIZET 0x2000 /* z: size_t */
76 #define SHORTSHORT 0x4000 /* hh: char */
77 #define UNSIGNED 0x8000 /* %[oupxX] conversions */
80 * The following are used in integral conversions only:
81 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
83 #define SIGNOK 0x40 /* +/- is (still) legal */
84 #define NDIGITS 0x80 /* no digits detected */
85 #define PFXOK 0x100 /* 0x prefix is (still) legal */
86 #define NZDIGITS 0x200 /* no zero digits detected */
87 #define HAVESIGN 0x10000 /* sign detected */
92 #define CT_CHAR 0 /* %c conversion */
93 #define CT_CCL 1 /* %[...] conversion */
94 #define CT_STRING 2 /* %s conversion */
95 #define CT_INT 3 /* %[dioupxX] conversion */
96 #define CT_FLOAT 4 /* %[efgEFG] conversion */
98 static int parsefloat(FILE *, wchar_t *, wchar_t *);
101 (cclcompl ? (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) == NULL) : \
102 (wmemchr(ccls, (_c), (size_t)(ccle - ccls)) != NULL))
108 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
113 _SET_ORIENTATION(fp, 1);
114 ret = __vfwscanf_unlocked(fp, fmt, ap);
120 * Non-MT-safe version.
123 __vfwscanf_unlocked(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
125 wint_t c; /* character from format, or conversion */
126 size_t width; /* field width, or 0 */
127 wchar_t *p; /* points into all kinds of strings */
128 int n; /* handy integer */
129 int flags; /* flags as defined above */
130 wchar_t *p0; /* saves original value of p when necessary */
131 int nassigned; /* number of fields assigned */
132 int nconversions; /* number of conversions */
133 int nread; /* number of characters consumed from fp */
134 int base; /* base argument to conversion function */
135 wchar_t buf[BUF]; /* buffer for numeric conversions */
136 const wchar_t *ccls; /* character class start */
137 const wchar_t *ccle; /* character class end */
138 int cclcompl; /* ccl is complemented? */
139 wint_t wi; /* handy wint_t */
140 char *mbp; /* multibyte string pointer for %c %s %[ */
141 size_t nconv; /* number of bytes in mb. conversion */
142 char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */
143 static const mbstate_t initial;
146 /* `basefix' is used to avoid `if' tests in the integer scanner */
147 static short basefix[17] =
148 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
162 while ((c = __fgetwc_unlock(fp)) != WEOF &&
174 * switch on the format. continue if done;
175 * break once format type is derived.
181 if ((wi = __fgetwc_unlock(fp)) == WEOF)
204 flags |= LONGLONG; /* not quite */
223 case '0': case '1': case '2': case '3': case '4':
224 case '5': case '6': case '7': case '8': case '9':
225 width = width * 10 + c - '0';
255 flags |= PFXOK; /* enable 0x prefixing */
261 #ifndef NO_FLOATING_POINT
262 case 'A': case 'E': case 'F': case 'G':
263 case 'a': case 'e': case 'f': case 'g':
284 while (*fmt != '\0' && *fmt != ']')
300 case 'p': /* pointer format is like hex */
301 flags |= POINTER | PFXOK;
302 c = CT_INT; /* assumes sizeof(uintmax_t) */
303 flags |= UNSIGNED; /* >= sizeof(uintptr_t) */
309 if (flags & SUPPRESS) /* ??? */
311 if (flags & SHORTSHORT)
312 *va_arg(ap, char *) = nread;
313 else if (flags & SHORT)
314 *va_arg(ap, short *) = nread;
315 else if (flags & LONG)
316 *va_arg(ap, long *) = nread;
317 else if (flags & LONGLONG)
318 *va_arg(ap, quad_t *) = nread;
319 else if (flags & INTMAXT)
320 *va_arg(ap, intmax_t *) = nread;
321 else if (flags & SIZET)
322 *va_arg(ap, size_t *) = nread;
323 else if (flags & PTRDIFFT)
324 *va_arg(ap, ptrdiff_t *) = nread;
326 *va_arg(ap, int *) = nread;
333 * Disgusting backwards compatibility hack. XXX
335 case '\0': /* compat */
340 * Consume leading white space, except for formats
341 * that suppress this.
343 if ((flags & NOSKIP) == 0) {
344 while ((wi = __fgetwc_unlock(fp)) != WEOF && iswspace(wi))
357 /* scan arbitrary characters (sets NOSKIP) */
361 if (!(flags & SUPPRESS))
362 p = va_arg(ap, wchar_t *);
364 while (width-- != 0 &&
365 (wi = __fgetwc_unlock(fp)) != WEOF) {
366 if (!(flags & SUPPRESS))
373 if (!(flags & SUPPRESS))
376 if (!(flags & SUPPRESS))
377 mbp = va_arg(ap, char *);
381 (wi = __fgetwc_unlock(fp)) != WEOF) {
382 if (width >= MB_CUR_MAX &&
383 !(flags & SUPPRESS)) {
384 nconv = wcrtomb(mbp, wi, &mbs);
385 if (nconv == (size_t)-1)
388 nconv = wcrtomb(mbbuf, wi,
390 if (nconv == (size_t)-1)
396 if (!(flags & SUPPRESS))
400 if (!(flags & SUPPRESS))
408 if (!(flags & SUPPRESS))
415 /* scan a (nonempty) character class (sets NOSKIP) */
417 width = (size_t)~0; /* `infinity' */
418 /* take only those things in the class */
419 if ((flags & SUPPRESS) && (flags & LONG)) {
421 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
422 width-- != 0 && INCCL(wi))
428 } else if (flags & LONG) {
429 p0 = p = va_arg(ap, wchar_t *);
430 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
431 width-- != 0 && INCCL(wi))
441 if (!(flags & SUPPRESS))
442 mbp = va_arg(ap, char *);
445 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
446 width != 0 && INCCL(wi)) {
447 if (width >= MB_CUR_MAX &&
448 !(flags & SUPPRESS)) {
449 nconv = wcrtomb(mbp, wi, &mbs);
450 if (nconv == (size_t)-1)
453 nconv = wcrtomb(mbbuf, wi,
455 if (nconv == (size_t)-1)
459 if (!(flags & SUPPRESS))
463 if (!(flags & SUPPRESS))
470 if (!(flags & SUPPRESS)) {
480 /* like CCL, but zero-length string OK, & no NOSKIP */
483 if ((flags & SUPPRESS) && (flags & LONG)) {
484 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
490 } else if (flags & LONG) {
491 p0 = p = va_arg(ap, wchar_t *);
492 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
503 if (!(flags & SUPPRESS))
504 mbp = va_arg(ap, char *);
506 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
509 if (width >= MB_CUR_MAX &&
510 !(flags & SUPPRESS)) {
511 nconv = wcrtomb(mbp, wi, &mbs);
512 if (nconv == (size_t)-1)
515 nconv = wcrtomb(mbbuf, wi,
517 if (nconv == (size_t)-1)
521 if (!(flags & SUPPRESS))
525 if (!(flags & SUPPRESS))
532 if (!(flags & SUPPRESS)) {
541 /* scan an integer as if by the conversion function */
542 if (width == 0 || width > sizeof(buf) /
544 width = sizeof(buf) / sizeof(*buf) - 1;
545 flags |= SIGNOK | NDIGITS | NZDIGITS;
546 for (p = buf; width; width--) {
547 c = __fgetwc_unlock(fp);
549 * Switch on the character; `goto ok'
550 * if we accept it as a part of number.
555 * The digit 0 is always legal, but is
556 * special. For %i conversions, if no
557 * digits (zero or nonzero) have been
558 * scanned (only signs), we will have
559 * base==0. In that case, we should set
560 * it to 8 and enable 0x prefixing.
561 * Also, if we have not scanned zero digits
562 * before this, do not turn off prefixing
563 * (someone else will turn it off if we
564 * have scanned any nonzero digits).
571 if (flags & NZDIGITS)
572 flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
574 flags &= ~(SIGNOK|PFXOK|NDIGITS);
577 /* 1 through 7 always legal */
578 case '1': case '2': case '3':
579 case '4': case '5': case '6': case '7':
580 base = basefix[base];
581 flags &= ~(SIGNOK | PFXOK | NDIGITS);
584 /* digits 8 and 9 ok iff decimal or hex */
586 base = basefix[base];
588 break; /* not legal here */
589 flags &= ~(SIGNOK | PFXOK | NDIGITS);
592 /* letters ok iff hex */
593 case 'A': case 'B': case 'C':
594 case 'D': case 'E': case 'F':
595 case 'a': case 'b': case 'c':
596 case 'd': case 'e': case 'f':
597 /* no need to fix base here */
599 break; /* not legal here */
600 flags &= ~(SIGNOK | PFXOK | NDIGITS);
603 /* sign ok only as first character */
605 if (flags & SIGNOK) {
613 * x ok iff flag still set & 2nd char (or
614 * 3rd char if we have a sign).
617 if (flags & PFXOK && p ==
618 buf + 1 + !!(flags & HAVESIGN)) {
619 base = 16; /* if %i */
627 * If we got here, c is not a legal character
628 * for a number. Stop accumulating digits.
635 * c is legal: store it and look at the next.
640 * If we had only a sign, it is no good; push
641 * back the sign. If the number ends in `x',
642 * it was [sign] '0' 'x', so push back the x
643 * and treat it as [sign] '0'.
645 if (flags & NDIGITS) {
651 if (c == 'x' || c == 'X') {
655 if ((flags & SUPPRESS) == 0) {
659 if ((flags & UNSIGNED) == 0)
660 res = wcstoimax(buf, NULL, base);
662 res = wcstoumax(buf, NULL, base);
664 *va_arg(ap, void **) =
665 (void *)(uintptr_t)res;
666 else if (flags & SHORTSHORT)
667 *va_arg(ap, char *) = (char)res;
668 else if (flags & SHORT)
669 *va_arg(ap, short *) = (short)res;
670 else if (flags & LONG)
671 *va_arg(ap, long *) = (long)res;
672 else if (flags & LONGLONG)
673 *va_arg(ap, quad_t *) = res;
674 else if (flags & INTMAXT)
675 *va_arg(ap, intmax_t *) = res;
676 else if (flags & PTRDIFFT)
677 *va_arg(ap, ptrdiff_t *) = (ptrdiff_t)res;
678 else if (flags & SIZET)
679 *va_arg(ap, size_t *) = (size_t)res;
681 *va_arg(ap, int *) = (int)res;
688 #ifndef NO_FLOATING_POINT
690 /* scan a floating point number as if by strtod */
691 if (width == 0 || width > sizeof(buf) /
693 width = sizeof(buf) / sizeof(*buf) - 1;
694 if ((width = parsefloat(fp, buf, buf + width)) == 0)
696 if ((flags & SUPPRESS) == 0) {
698 if (flags & LONGDBL) {
699 long double res = wcstold(buf, &p);
700 *va_arg(ap, long double *) = res;
704 double res = wcstod(buf, &p);
705 *va_arg(ap, double *) = res;
708 float res = wcstof(buf, &p);
709 *va_arg(ap, float *) = res;
713 if (p - buf != width)
721 #endif /* !NO_FLOATING_POINT */
725 return (nconversions != 0 ? nassigned : EOF);
730 #ifndef NO_FLOATING_POINT
732 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end)
737 S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX,
738 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
741 wchar_t decpt = (wchar_t)(unsigned char)*localeconv()->decimal_point;
742 int gotmantdig = 0, ishex = 0;
745 * We set commit = p whenever the string we have read so far
746 * constitutes a valid representation of a floating point
747 * number by itself. At some point, the parse will complete
748 * or fail, and we will ungetc() back to the last commit point.
749 * To ensure that the file offset gets updated properly, it is
750 * always necessary to read at least one character that doesn't
751 * match; thus, we can't short-circuit "infinity" or "nan(...)".
755 for (p = buf; p < end; ) {
756 if ((c = __fgetwc_unlock(fp)) == WEOF)
762 if (c == '-' || c == '+')
787 (c != "nfinity"[infnanpos] &&
788 c != "NFINITY"[infnanpos]))
790 if (infnanpos == 1 || infnanpos == 6)
791 commit = p; /* inf or infinity */
796 case -1: /* XXX kludge to deal with nan(...) */
799 if (c != 'A' && c != 'a')
803 if (c != 'N' && c != 'n')
816 } else if (!iswalnum(c) && c != '_')
824 if (c == 'X' || c == 'x') {
827 } else { /* we saw a '0', but no 'x' */
832 if ((ishex && iswxdigit(c)) || iswdigit(c))
843 if (((c == 'E' || c == 'e') && !ishex) ||
844 ((c == 'P' || c == 'p') && ishex)) {
849 } else if ((ishex && iswxdigit(c)) || iswdigit(c)) {
857 if (c == '-' || c == '+')
880 return (commit - buf);