2 * Copyright (c) 1990, 1993
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5 * This code is derived from software contributed to Berkeley by
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32 * @(#)vfscanf.c 8.1 (Berkeley) 6/4/93
33 * $FreeBSD: src/lib/libc/stdio/vfwscanf.c,v 1.17 2009/01/19 06:19:51 das Exp $
34 * $DragonFly: src/lib/libc/stdio/vfwscanf.c,v 1.1 2005/07/25 00:37:41 joerg Exp $
37 #include "namespace.h"
48 #include "un-namespace.h"
50 #include "libc_private.h"
52 #include "priv_stdio.h"
54 #ifndef NO_FLOATING_POINT
58 #define BUF 513 /* Maximum length of numeric string. */
61 * Flags used during conversion.
63 #define LONG 0x01 /* l: long or double */
64 #define LONGDBL 0x02 /* L: long double */
65 #define SHORT 0x04 /* h: short */
66 #define SUPPRESS 0x08 /* *: suppress assignment */
67 #define POINTER 0x10 /* p: void * (as hex) */
68 #define NOSKIP 0x20 /* [ or c: do not skip blanks */
69 #define LONGLONG 0x400 /* ll: long long (+ deprecated q: quad) */
70 #define INTMAXT 0x800 /* j: intmax_t */
71 #define PTRDIFFT 0x1000 /* t: ptrdiff_t */
72 #define SIZET 0x2000 /* z: size_t */
73 #define SHORTSHORT 0x4000 /* hh: char */
74 #define UNSIGNED 0x8000 /* %[oupxX] conversions */
77 * The following are used in integral conversions only:
78 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS
80 #define SIGNOK 0x40 /* +/- is (still) legal */
81 #define NDIGITS 0x80 /* no digits detected */
82 #define PFXOK 0x100 /* 0x prefix is (still) legal */
83 #define NZDIGITS 0x200 /* no zero digits detected */
84 #define HAVESIGN 0x10000 /* sign detected */
89 #define CT_CHAR 0 /* %c conversion */
90 #define CT_CCL 1 /* %[...] conversion */
91 #define CT_STRING 2 /* %s conversion */
92 #define CT_INT 3 /* %[dioupxX] conversion */
93 #define CT_FLOAT 4 /* %[efgEFG] conversion */
95 #ifndef NO_FLOATING_POINT
96 static int parsefloat(FILE *, wchar_t *, wchar_t *);
100 (cclcompl ? (wmemchr(ccls, (_c), ccle - ccls) == NULL) : \
101 (wmemchr(ccls, (_c), ccle - ccls) != NULL))
103 static const mbstate_t initial_mbs;
109 vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
115 ret = __vfwscanf(fp, fmt, ap);
121 * Non-MT-safe version.
124 __vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
126 wint_t c; /* character from format, or conversion */
127 size_t width; /* field width, or 0 */
128 wchar_t *p; /* points into all kinds of strings */
129 int n; /* handy integer */
130 int flags; /* flags as defined above */
131 wchar_t *p0; /* saves original value of p when necessary */
132 int nassigned; /* number of fields assigned */
133 int nconversions; /* number of conversions */
134 int nread; /* number of characters consumed from fp */
135 int base; /* base argument to conversion function */
136 wchar_t buf[BUF]; /* buffer for numeric conversions */
137 const wchar_t *ccls; /* character class start */
138 const wchar_t *ccle; /* character class end */
139 int cclcompl; /* ccl is complemented? */
140 wint_t wi; /* handy wint_t */
141 char *mbp; /* multibyte string pointer for %c %s %[ */
142 size_t nconv; /* number of bytes in mb. conversion */
143 char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */
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 };
159 while ((c = __fgetwc_unlock(fp)) != WEOF &&
171 * switch on the format. continue if done;
172 * break once format type is derived.
178 if ((wi = __fgetwc_unlock(fp)) == WEOF)
201 flags |= LONGLONG; /* not quite */
220 case '0': case '1': case '2': case '3': case '4':
221 case '5': case '6': case '7': case '8': case '9':
222 width = width * 10 + c - '0';
252 flags |= PFXOK; /* enable 0x prefixing */
258 #ifndef NO_FLOATING_POINT
259 case 'A': case 'E': case 'F': case 'G':
260 case 'a': case 'e': case 'f': case 'g':
281 while (*fmt != '\0' && *fmt != ']')
297 case 'p': /* pointer format is like hex */
298 flags |= POINTER | PFXOK;
299 c = CT_INT; /* assumes sizeof(uintmax_t) */
300 flags |= UNSIGNED; /* >= sizeof(uintptr_t) */
306 if (flags & SUPPRESS) /* ??? */
308 if (flags & SHORTSHORT)
309 *va_arg(ap, char *) = nread;
310 else if (flags & SHORT)
311 *va_arg(ap, short *) = nread;
312 else if (flags & LONG)
313 *va_arg(ap, long *) = nread;
314 else if (flags & LONGLONG)
315 *va_arg(ap, long long *) = nread;
316 else if (flags & INTMAXT)
317 *va_arg(ap, intmax_t *) = nread;
318 else if (flags & SIZET)
319 *va_arg(ap, size_t *) = nread;
320 else if (flags & PTRDIFFT)
321 *va_arg(ap, ptrdiff_t *) = nread;
323 *va_arg(ap, int *) = nread;
330 * Disgusting backwards compatibility hack. XXX
332 case '\0': /* compat */
337 * Consume leading white space, except for formats
338 * that suppress this.
340 if ((flags & NOSKIP) == 0) {
341 while ((wi = __fgetwc_unlock(fp)) != WEOF && iswspace(wi))
354 /* scan arbitrary characters (sets NOSKIP) */
358 if (!(flags & SUPPRESS))
359 p = va_arg(ap, wchar_t *);
361 while (width-- != 0 &&
362 (wi = __fgetwc_unlock(fp)) != WEOF) {
363 if (!(flags & SUPPRESS))
370 if (!(flags & SUPPRESS))
373 if (!(flags & SUPPRESS))
374 mbp = va_arg(ap, char *);
378 (wi = __fgetwc_unlock(fp)) != WEOF) {
379 if (width >= MB_CUR_MAX &&
380 !(flags & SUPPRESS)) {
381 nconv = wcrtomb(mbp, wi, &mbs);
382 if (nconv == (size_t)-1)
385 nconv = wcrtomb(mbbuf, wi,
387 if (nconv == (size_t)-1)
393 if (!(flags & SUPPRESS))
397 if (!(flags & SUPPRESS))
405 if (!(flags & SUPPRESS))
412 /* scan a (nonempty) character class (sets NOSKIP) */
414 width = (size_t)~0; /* `infinity' */
415 /* take only those things in the class */
416 if ((flags & SUPPRESS) && (flags & LONG)) {
418 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
419 width-- != 0 && INCCL(wi))
425 } else if (flags & LONG) {
426 p0 = p = va_arg(ap, wchar_t *);
427 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
428 width-- != 0 && INCCL(wi))
438 if (!(flags & SUPPRESS))
439 mbp = va_arg(ap, char *);
442 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
443 width != 0 && INCCL(wi)) {
444 if (width >= MB_CUR_MAX &&
445 !(flags & SUPPRESS)) {
446 nconv = wcrtomb(mbp, wi, &mbs);
447 if (nconv == (size_t)-1)
450 nconv = wcrtomb(mbbuf, wi,
452 if (nconv == (size_t)-1)
456 if (!(flags & SUPPRESS))
460 if (!(flags & SUPPRESS))
467 if (!(flags & SUPPRESS)) {
477 /* like CCL, but zero-length string OK, & no NOSKIP */
480 if ((flags & SUPPRESS) && (flags & LONG)) {
481 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
487 } else if (flags & LONG) {
488 p0 = p = va_arg(ap, wchar_t *);
489 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
500 if (!(flags & SUPPRESS))
501 mbp = va_arg(ap, char *);
503 while ((wi = __fgetwc_unlock(fp)) != WEOF &&
506 if (width >= MB_CUR_MAX &&
507 !(flags & SUPPRESS)) {
508 nconv = wcrtomb(mbp, wi, &mbs);
509 if (nconv == (size_t)-1)
512 nconv = wcrtomb(mbbuf, wi,
514 if (nconv == (size_t)-1)
518 if (!(flags & SUPPRESS))
522 if (!(flags & SUPPRESS))
529 if (!(flags & SUPPRESS)) {
538 /* scan an integer as if by the conversion function */
539 if (width == 0 || width > sizeof(buf) /
541 width = sizeof(buf) / sizeof(*buf) - 1;
542 flags |= SIGNOK | NDIGITS | NZDIGITS;
543 for (p = buf; width; width--) {
544 c = __fgetwc_unlock(fp);
546 * Switch on the character; `goto ok'
547 * if we accept it as a part of number.
552 * The digit 0 is always legal, but is
553 * special. For %i conversions, if no
554 * digits (zero or nonzero) have been
555 * scanned (only signs), we will have
556 * base==0. In that case, we should set
557 * it to 8 and enable 0x prefixing.
558 * Also, if we have not scanned zero digits
559 * before this, do not turn off prefixing
560 * (someone else will turn it off if we
561 * have scanned any nonzero digits).
568 if (flags & NZDIGITS)
569 flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
571 flags &= ~(SIGNOK|PFXOK|NDIGITS);
574 /* 1 through 7 always legal */
575 case '1': case '2': case '3':
576 case '4': case '5': case '6': case '7':
577 base = basefix[base];
578 flags &= ~(SIGNOK | PFXOK | NDIGITS);
581 /* digits 8 and 9 ok iff decimal or hex */
583 base = basefix[base];
585 break; /* not legal here */
586 flags &= ~(SIGNOK | PFXOK | NDIGITS);
589 /* letters ok iff hex */
590 case 'A': case 'B': case 'C':
591 case 'D': case 'E': case 'F':
592 case 'a': case 'b': case 'c':
593 case 'd': case 'e': case 'f':
594 /* no need to fix base here */
596 break; /* not legal here */
597 flags &= ~(SIGNOK | PFXOK | NDIGITS);
600 /* sign ok only as first character */
602 if (flags & SIGNOK) {
610 * x ok iff flag still set & 2nd char (or
611 * 3rd char if we have a sign).
614 if (flags & PFXOK && p ==
615 buf + 1 + !!(flags & HAVESIGN)) {
616 base = 16; /* if %i */
624 * If we got here, c is not a legal character
625 * for a number. Stop accumulating digits.
632 * c is legal: store it and look at the next.
637 * If we had only a sign, it is no good; push
638 * back the sign. If the number ends in `x',
639 * it was [sign] '0' 'x', so push back the x
640 * and treat it as [sign] '0'.
642 if (flags & NDIGITS) {
648 if (c == 'x' || c == 'X') {
652 if ((flags & SUPPRESS) == 0) {
656 if ((flags & UNSIGNED) == 0)
657 res = wcstoimax(buf, NULL, base);
659 res = wcstoumax(buf, NULL, base);
661 *va_arg(ap, void **) =
662 (void *)(uintptr_t)res;
663 else if (flags & SHORTSHORT)
664 *va_arg(ap, char *) = res;
665 else if (flags & SHORT)
666 *va_arg(ap, short *) = res;
667 else if (flags & LONG)
668 *va_arg(ap, long *) = res;
669 else if (flags & LONGLONG)
670 *va_arg(ap, long long *) = res;
671 else if (flags & INTMAXT)
672 *va_arg(ap, intmax_t *) = res;
673 else if (flags & PTRDIFFT)
674 *va_arg(ap, ptrdiff_t *) = res;
675 else if (flags & SIZET)
676 *va_arg(ap, size_t *) = res;
678 *va_arg(ap, int *) = res;
685 #ifndef NO_FLOATING_POINT
687 /* scan a floating point number as if by strtod */
688 if (width == 0 || width > sizeof(buf) /
690 width = sizeof(buf) / sizeof(*buf) - 1;
691 if ((width = parsefloat(fp, buf, buf + width)) == 0)
693 if ((flags & SUPPRESS) == 0) {
694 if (flags & LONGDBL) {
695 long double res = wcstold(buf, &p);
696 *va_arg(ap, long double *) = res;
697 } else if (flags & LONG) {
698 double res = wcstod(buf, &p);
699 *va_arg(ap, double *) = res;
701 float res = wcstof(buf, &p);
702 *va_arg(ap, float *) = res;
709 #endif /* !NO_FLOATING_POINT */
713 return (nconversions != 0 ? nassigned : EOF);
718 #ifndef NO_FLOATING_POINT
720 parsefloat(FILE *fp, wchar_t *buf, wchar_t *end)
727 S_START, S_GOTSIGN, S_INF, S_NAN, S_DONE, S_MAYBEHEX,
728 S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
732 _Bool gotmantdig = 0, ishex = 0;
735 nconv = mbrtowc(&decpt, localeconv()->decimal_point, MB_CUR_MAX, &mbs);
736 if (nconv == (size_t)-1 || nconv == (size_t)-2)
737 decpt = '.'; /* failsafe */
740 * We set commit = p whenever the string we have read so far
741 * constitutes a valid representation of a floating point
742 * number by itself. At some point, the parse will complete
743 * or fail, and we will ungetc() back to the last commit point.
744 * To ensure that the file offset gets updated properly, it is
745 * always necessary to read at least one character that doesn't
746 * match; thus, we can't short-circuit "infinity" or "nan(...)".
750 for (p = buf; p < end; ) {
751 if ((c = __fgetwc_unlock(fp)) == WEOF)
757 if (c == '-' || c == '+')
782 (c != "nfinity"[infnanpos] &&
783 c != "NFINITY"[infnanpos]))
785 if (infnanpos == 1 || infnanpos == 6)
786 commit = p; /* inf or infinity */
792 if (c != 'A' && c != 'a')
796 if (c != 'N' && c != 'n')
809 } else if (!iswalnum(c) && c != '_')
819 if (c == 'X' || c == 'x') {
822 } else { /* we saw a '0', but no 'x' */
827 if ((ishex && iswxdigit(c)) || iswdigit(c))
838 if (((c == 'E' || c == 'e') && !ishex) ||
839 ((c == 'P' || c == 'p') && ishex)) {
844 } else if ((ishex && iswxdigit(c)) || iswdigit(c)) {
852 if (c == '-' || c == '+')
875 return (commit - buf);