/*      $OpenBSD: vfwscanf.c,v 1.8 2022/12/27 17:10:06 jmc Exp $ */
/*-
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <inttypes.h>
#include <limits.h>
#include <locale.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wctype.h>
#include "local.h"

#ifdef FLOATING_POINT
#include <float.h>
#include "floatio.h"
#endif

#define BUF             513     /* Maximum length of numeric string. */

/*
 * Flags used during conversion.
 */
#define LONG            0x00001 /* l: long or double */
#define LONGDBL         0x00002 /* L: long double */
#define SHORT           0x00004 /* h: short */
#define SHORTSHORT      0x00008 /* hh: 8 bit integer */
#define LLONG           0x00010 /* ll: long long (+ deprecated q: quad) */
#define POINTER         0x00020 /* p: void * (as hex) */
#define SIZEINT         0x00040 /* z: (signed) size_t */
#define MAXINT          0x00080 /* j: intmax_t */
#define PTRINT          0x00100 /* t: ptrdiff_t */
#define NOSKIP          0x00200 /* [ or c: do not skip blanks */
#define SUPPRESS        0x00400 /* *: suppress assignment */
#define UNSIGNED        0x00800 /* %[oupxX] conversions */

/*
 * The following are used in numeric conversions only:
 * SIGNOK, HAVESIGN, NDIGITS, DPTOK, and EXPOK are for floating point;
 * SIGNOK, HAVESIGN, NDIGITS, PFXOK, and NZDIGITS are for integral.
 */
#define SIGNOK          0x01000 /* +/- is (still) legal */
#define HAVESIGN        0x02000 /* sign detected */
#define NDIGITS         0x04000 /* no digits detected */

#define DPTOK           0x08000 /* (float) decimal point is still legal */
#define EXPOK           0x10000 /* (float) exponent (e+3, etc) still legal */

#define PFXOK           0x08000 /* 0x prefix is (still) legal */
#define NZDIGITS        0x10000 /* no zero digits detected */

/*
 * Conversion types.
 */
#define CT_CHAR         0       /* %c conversion */
#define CT_CCL          1       /* %[...] conversion */
#define CT_STRING       2       /* %s conversion */
#define CT_INT          3       /* integer, i.e., strtoimax or strtoumax */
#define CT_FLOAT        4       /* floating, i.e., strtod */

#define u_char unsigned char
#define u_long unsigned long

#define INCCL(_c)       \
        (cclcompl ? (wmemchr(ccls, (_c), ccle - ccls) == NULL) : \
        (wmemchr(ccls, (_c), ccle - ccls) != NULL))

/*
 * vfwscanf
 */
int
__vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, __va_list ap)
{
        wint_t c;       /* character from format, or conversion */
        size_t width;   /* field width, or 0 */
        wchar_t *p;     /* points into all kinds of strings */
        int n;          /* handy integer */
        int flags;      /* flags as defined above */
        wchar_t *p0;    /* saves original value of p when necessary */
        int nassigned;          /* number of fields assigned */
        int nconversions;       /* number of conversions */
        int nread;              /* number of characters consumed from fp */
        int base;               /* base argument to strtoimax/strtouimax */
        wchar_t buf[BUF];       /* buffer for numeric conversions */
        const wchar_t *ccls;    /* character class start */
        const wchar_t *ccle;    /* character class end */
        int cclcompl;           /* ccl is complemented? */
        wint_t wi;              /* handy wint_t */
        char *mbp;              /* multibyte string pointer for %c %s %[ */
        size_t nconv;           /* number of bytes in mb. conversion */
        char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */
        mbstate_t mbs;
#ifdef FLOATING_POINT
        wchar_t decimal_point = 0;
#endif

        /* `basefix' is used to avoid `if' tests in the integer scanner */
        static short basefix[17] =
                { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };

        _SET_ORIENTATION(fp, 1);

        nassigned = 0;
        nconversions = 0;
        nread = 0;
        base = 0;               /* XXX just to keep gcc happy */
        ccls = ccle = NULL;
        for (;;) {
                c = *fmt++;
                if (c == 0) {
                        return (nassigned);
                }
                if (iswspace(c)) {
                        while ((c = __fgetwc_unlock(fp)) != WEOF &&
                            iswspace(c))
                                ;
                        if (c != WEOF)
                                __ungetwc(c, fp);
                        continue;
                }
                if (c != '%')
                        goto literal;
                width = 0;
                flags = 0;
                /*
                 * switch on the format.  continue if done;
                 * break once format type is derived.
                 */
again:          c = *fmt++;
                switch (c) {
                case '%':
literal:
                        if ((wi = __fgetwc_unlock(fp)) == WEOF)
                                goto input_failure;
                        if (wi != c) {
                                __ungetwc(wi, fp);
                                goto match_failure;
                        }
                        nread++;
                        continue;

                case '*':
                        flags |= SUPPRESS;
                        goto again;
                case 'j':
                        flags |= MAXINT;
                        goto again;
                case 'L':
                        flags |= LONGDBL;
                        goto again;
                case 'h':
                        if (*fmt == 'h') {
                                fmt++;
                                flags |= SHORTSHORT;
                        } else {
                                flags |= SHORT;
                        }
                        goto again;
                case 'l':
                        if (*fmt == 'l') {
                                fmt++;
                                flags |= LLONG;
                        } else {
                                flags |= LONG;
                        }
                        goto again;
                case 'q':
                        flags |= LLONG;         /* deprecated */
                        goto again;
                case 't':
                        flags |= PTRINT;
                        goto again;
                case 'z':
                        flags |= SIZEINT;
                        goto again;

                case '0': case '1': case '2': case '3': case '4':
                case '5': case '6': case '7': case '8': case '9':
                        width = width * 10 + c - '0';
                        goto again;

                /*
                 * Conversions.
                 * Those marked `compat' are for 4.[123]BSD compatibility.
                 *
                 * (According to ANSI, E and X formats are supposed
                 * to the same as e and x.  Sorry about that.)
                 */
                case 'D':       /* compat */
                        flags |= LONG;
                        /* FALLTHROUGH */
                case 'd':
                        c = CT_INT;
                        base = 10;
                        break;

                case 'i':
                        c = CT_INT;
                        base = 0;
                        break;

                case 'O':       /* compat */
                        flags |= LONG;
                        /* FALLTHROUGH */
                case 'o':
                        c = CT_INT;
                        flags |= UNSIGNED;
                        base = 8;
                        break;

                case 'u':
                        c = CT_INT;
                        flags |= UNSIGNED;
                        base = 10;
                        break;

                case 'X':
                case 'x':
                        flags |= PFXOK; /* enable 0x prefixing */
                        c = CT_INT;
                        flags |= UNSIGNED;
                        base = 16;
                        break;

#ifdef FLOATING_POINT
                case 'e': case 'E':
                case 'f': case 'F':
                case 'g': case 'G':
                case 'a': case 'A':
                        c = CT_FLOAT;
                        break;
#endif

                case 's':
                        c = CT_STRING;
                        break;

                case '[':
                        ccls = fmt;
                        if (*fmt == '^') {
                                cclcompl = 1;
                                fmt++;
                        } else
                                cclcompl = 0;
                        if (*fmt == ']')
                                fmt++;
                        while (*fmt != '\0' && *fmt != ']')
                                fmt++;
                        ccle = fmt;
                        fmt++;
                        flags |= NOSKIP;
                        c = CT_CCL;
                        break;

                case 'c':
                        flags |= NOSKIP;
                        c = CT_CHAR;
                        break;

                case 'p':       /* pointer format is like hex */
                        flags |= POINTER | PFXOK;
                        c = CT_INT;
                        flags |= UNSIGNED;
                        base = 16;
                        break;

                case 'n':
                        nconversions++;
                        if (flags & SUPPRESS)
                                continue;
                        if (flags & SHORTSHORT)
                                *va_arg(ap, signed char *) = nread;
                        else if (flags & SHORT)
                                *va_arg(ap, short *) = nread;
                        else if (flags & LONG)
                                *va_arg(ap, long *) = nread;
                        else if (flags & SIZEINT)
                                *va_arg(ap, ssize_t *) = nread;
                        else if (flags & PTRINT)
                                *va_arg(ap, ptrdiff_t *) = nread;
                        else if (flags & LLONG)
                                *va_arg(ap, long long *) = nread;
                        else if (flags & MAXINT)
                                *va_arg(ap, intmax_t *) = nread;
                        else
                                *va_arg(ap, int *) = nread;
                        continue;

                /*
                 * Disgusting backwards compatibility hacks.    XXX
                 */
                case '\0':      /* compat */
                        return (EOF);

                default:        /* compat */
                        if (iswupper(c))
                                flags |= LONG;
                        c = CT_INT;
                        base = 10;
                        break;
                }

                /*
                 * Consume leading white space, except for formats
                 * that suppress this.
                 */
                if ((flags & NOSKIP) == 0) {
                        while ((wi = __fgetwc_unlock(fp)) != WEOF &&
                            iswspace(wi))
                                nread++;
                        if (wi == WEOF)
                                goto input_failure;
                        __ungetwc(wi, fp);
                }

                /*
                 * Do the conversion.
                 */
                switch (c) {

                case CT_CHAR:
                        /* scan arbitrary characters (sets NOSKIP) */
                        if (width == 0)
                                width = 1;
                        if (flags & LONG) {
                                if (!(flags & SUPPRESS))
                                        p = va_arg(ap, wchar_t *);
                                n = 0;
                                while (width-- != 0 &&
                                    (wi = __fgetwc_unlock(fp)) != WEOF) {
                                        if (!(flags & SUPPRESS))
                                                *p++ = (wchar_t)wi;
                                        n++;
                                }
                                if (n == 0)
                                        goto input_failure;
                                nread += n;
                                if (!(flags & SUPPRESS))
                                        nassigned++;
                        } else {
                                if (!(flags & SUPPRESS))
                                        mbp = va_arg(ap, char *);
                                n = 0;
                                bzero(&mbs, sizeof(mbs));
                                while (width != 0 &&
                                    (wi = __fgetwc_unlock(fp)) != WEOF) {
                                        if (width >= MB_CUR_MAX &&
                                            !(flags & SUPPRESS)) {
                                                nconv = wcrtomb(mbp, wi, &mbs);
                                                if (nconv == (size_t)-1)
                                                        goto input_failure;
                                        } else {
                                                nconv = wcrtomb(mbbuf, wi,
                                                    &mbs);
                                                if (nconv == (size_t)-1)
                                                        goto input_failure;
                                                if (nconv > width) {
                                                        __ungetwc(wi, fp);
                                                        break;
                                                }
                                                if (!(flags & SUPPRESS))
                                                        memcpy(mbp, mbbuf,
                                                            nconv);
                                        }
                                        if (!(flags & SUPPRESS))
                                                mbp += nconv;
                                        width -= nconv;
                                        n++;
                                }
                                if (n == 0)
                                        goto input_failure;
                                nread += n;
                                if (!(flags & SUPPRESS))
                                        nassigned++;
                        }
                        nconversions++;
                        break;

                case CT_CCL:
                        /* scan a (nonempty) character class (sets NOSKIP) */
                        if (width == 0)
                                width = (size_t)~0;     /* `infinity' */
                        /* take only those things in the class */
                        if ((flags & SUPPRESS) && (flags & LONG)) {
                                n = 0;
                                while ((wi = __fgetwc_unlock(fp)) != WEOF &&
                                    width-- != 0 && INCCL(wi))
                                        n++;
                                if (wi != WEOF)
                                        __ungetwc(wi, fp);
                                if (n == 0)
                                        goto match_failure;
                        } else if (flags & LONG) {
                                p0 = p = va_arg(ap, wchar_t *);
                                while ((wi = __fgetwc_unlock(fp)) != WEOF &&
                                    width-- != 0 && INCCL(wi))
                                        *p++ = (wchar_t)wi;
                                if (wi != WEOF)
                                        __ungetwc(wi, fp);
                                n = p - p0;
                                if (n == 0)
                                        goto match_failure;
                                *p = 0;
                                nassigned++;
                        } else {
                                if (!(flags & SUPPRESS))
                                        mbp = va_arg(ap, char *);
                                n = 0;
                                bzero(&mbs, sizeof(mbs));
                                while ((wi = __fgetwc_unlock(fp)) != WEOF &&
                                    width != 0 && INCCL(wi)) {
                                        if (width >= MB_CUR_MAX &&
                                           !(flags & SUPPRESS)) {
                                                nconv = wcrtomb(mbp, wi, &mbs);
                                                if (nconv == (size_t)-1)
                                                        goto input_failure;
                                        } else {
                                                nconv = wcrtomb(mbbuf, wi,
                                                    &mbs);
                                                if (nconv == (size_t)-1)
                                                        goto input_failure;
                                                if (nconv > width)
                                                        break;
                                                if (!(flags & SUPPRESS))
                                                        memcpy(mbp, mbbuf,
                                                            nconv);
                                        }
                                        if (!(flags & SUPPRESS))
                                                mbp += nconv;
                                        width -= nconv;
                                        n++;
                                }
                                if (wi != WEOF)
                                        __ungetwc(wi, fp);
                                if (!(flags & SUPPRESS)) {
                                        *mbp = 0;
                                        nassigned++;
                                }
                        }
                        nread += n;
                        nconversions++;
                        break;

                case CT_STRING:
                        /* like CCL, but zero-length string OK, & no NOSKIP */
                        if (width == 0)
                                width = (size_t)~0;
                        if ((flags & SUPPRESS) && (flags & LONG)) {
                                while ((wi = __fgetwc_unlock(fp)) != WEOF &&
                                    width-- != 0 &&
                                    !iswspace(wi))
                                        nread++;
                                if (wi != WEOF)
                                        __ungetwc(wi, fp);
                        } else if (flags & LONG) {
                                p0 = p = va_arg(ap, wchar_t *);
                                while ((wi = __fgetwc_unlock(fp)) != WEOF &&
                                    width-- != 0 &&
                                    !iswspace(wi)) {
                                        *p++ = (wchar_t)wi;
                                        nread++;
                                }
                                if (wi != WEOF)
                                        __ungetwc(wi, fp);
                                *p = 0;
                                nassigned++;
                        } else {
                                if (!(flags & SUPPRESS))
                                        mbp = va_arg(ap, char *);
                                bzero(&mbs, sizeof(mbs));
                                while ((wi = __fgetwc_unlock(fp)) != WEOF &&
                                    width != 0 &&
                                    !iswspace(wi)) {
                                        if (width >= MB_CUR_MAX &&
                                            !(flags & SUPPRESS)) {
                                                nconv = wcrtomb(mbp, wi, &mbs);
                                                if (nconv == (size_t)-1)
                                                        goto input_failure;
                                        } else {
                                                nconv = wcrtomb(mbbuf, wi,
                                                    &mbs);
                                                if (nconv == (size_t)-1)
                                                        goto input_failure;
                                                if (nconv > width)
                                                        break;
                                                if (!(flags & SUPPRESS))
                                                        memcpy(mbp, mbbuf,
                                                            nconv);
                                        }
                                        if (!(flags & SUPPRESS))
                                                mbp += nconv;
                                        width -= nconv;
                                        nread++;
                                }
                                if (wi != WEOF)
                                        __ungetwc(wi, fp);
                                if (!(flags & SUPPRESS)) {
                                        *mbp = 0;
                                        nassigned++;
                                }
                        }
                        nconversions++;
                        continue;

                case CT_INT:
                        /* scan an integer as if by strtoimax/strtoumax */
                        if (width == 0 || width > sizeof(buf) /
                            sizeof(*buf) - 1)
                                width = sizeof(buf) / sizeof(*buf) - 1;
                        flags |= SIGNOK | NDIGITS | NZDIGITS;
                        for (p = buf; width; width--) {
                                c = __fgetwc_unlock(fp);
                                /*
                                 * Switch on the character; `goto ok'
                                 * if we accept it as a part of number.
                                 */
                                switch (c) {

                                /*
                                 * The digit 0 is always legal, but is
                                 * special.  For %i conversions, if no
                                 * digits (zero or nonzero) have been
                                 * scanned (only signs), we will have
                                 * base==0.  In that case, we should set
                                 * it to 8 and enable 0x prefixing.
                                 * Also, if we have not scanned zero digits
                                 * before this, do not turn off prefixing
                                 * (someone else will turn it off if we
                                 * have scanned any nonzero digits).
                                 */
                                case '0':
                                        if (base == 0) {
                                                base = 8;
                                                flags |= PFXOK;
                                        }
                                        if (flags & NZDIGITS)
                                            flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
                                        else
                                            flags &= ~(SIGNOK|PFXOK|NDIGITS);
                                        goto ok;

                                /* 1 through 7 always legal */
                                case '1': case '2': case '3':
                                case '4': case '5': case '6': case '7':
                                        base = basefix[base];
                                        flags &= ~(SIGNOK | PFXOK | NDIGITS);
                                        goto ok;

                                /* digits 8 and 9 ok iff decimal or hex */
                                case '8': case '9':
                                        base = basefix[base];
                                        if (base <= 8)
                                                break;  /* not legal here */
                                        flags &= ~(SIGNOK | PFXOK | NDIGITS);
                                        goto ok;

                                /* letters ok iff hex */
                                case 'A': case 'B': case 'C':
                                case 'D': case 'E': case 'F':
                                case 'a': case 'b': case 'c':
                                case 'd': case 'e': case 'f':
                                        /* no need to fix base here */
                                        if (base <= 10)
                                                break;  /* not legal here */
                                        flags &= ~(SIGNOK | PFXOK | NDIGITS);
                                        goto ok;

                                /* sign ok only as first character */
                                case '+': case '-':
                                        if (flags & SIGNOK) {
                                                flags &= ~SIGNOK;
                                                flags |= HAVESIGN;
                                                goto ok;
                                        }
                                        break;

                                /*
                                 * x ok iff flag still set and 2nd char (or
                                 * 3rd char if we have a sign).
                                 */
                                case 'x': case 'X':
                                        if ((flags & PFXOK) && p ==
                                            buf + 1 + !!(flags & HAVESIGN)) {
                                                base = 16;      /* if %i */
                                                flags &= ~PFXOK;
                                                goto ok;
                                        }
                                        break;
                                }

                                /*
                                 * If we got here, c is not a legal character
                                 * for a number.  Stop accumulating digits.
                                 */
                                if (c != WEOF)
                                        __ungetwc(c, fp);
                                break;
                ok:
                                /*
                                 * c is legal: store it and look at the next.
                                 */
                                *p++ = (wchar_t)c;
                        }
                        /*
                         * If we had only a sign, it is no good; push
                         * back the sign.  If the number ends in `x',
                         * it was [sign] '0' 'x', so push back the x
                         * and treat it as [sign] '0'.
                         */
                        if (flags & NDIGITS) {
                                if (p > buf)
                                        __ungetwc(*--p, fp);
                                goto match_failure;
                        }
                        c = p[-1];
                        if (c == 'x' || c == 'X') {
                                --p;
                                __ungetwc(c, fp);
                        }
                        if ((flags & SUPPRESS) == 0) {
                                uintmax_t res;

                                *p = '\0';
                                if (flags & UNSIGNED)
                                        res = wcstoimax(buf, NULL, base);
                                else
                                        res = wcstoumax(buf, NULL, base);
                                if (flags & POINTER)
                                        *va_arg(ap, void **) =
                                            (void *)(uintptr_t)res;
                                else if (flags & MAXINT)
                                        *va_arg(ap, intmax_t *) = res;
                                else if (flags & LLONG)
                                        *va_arg(ap, long long *) = res;
                                else if (flags & SIZEINT)
                                        *va_arg(ap, ssize_t *) = res;
                                else if (flags & PTRINT)
                                        *va_arg(ap, ptrdiff_t *) = res;
                                else if (flags & LONG)
                                        *va_arg(ap, long *) = res;
                                else if (flags & SHORT)
                                        *va_arg(ap, short *) = res;
                                else if (flags & SHORTSHORT)
                                        *va_arg(ap, signed char *) = res;
                                else
                                        *va_arg(ap, int *) = res;
                                nassigned++;
                        }
                        nread += p - buf;
                        nconversions++;
                        break;

#ifdef FLOATING_POINT
                case CT_FLOAT:
                        /* scan a floating point number as if by strtod */
                        if (width == 0 || width > sizeof(buf) /
                            sizeof(*buf) - 1)
                                width = sizeof(buf) / sizeof(*buf) - 1;
                        flags |= SIGNOK | NDIGITS | DPTOK | EXPOK;
                        for (p = buf; width; width--) {
                                c = __fgetwc_unlock(fp);
                                /*
                                 * This code mimics the integer conversion
                                 * code, but is much simpler.
                                 */
                                switch (c) {

                                case '0': case '1': case '2': case '3':
                                case '4': case '5': case '6': case '7':
                                case '8': case '9':
                                        flags &= ~(SIGNOK | NDIGITS);
                                        goto fok;

                                case '+': case '-':
                                        if (flags & SIGNOK) {
                                                flags &= ~SIGNOK;
                                                goto fok;
                                        }
                                        break;
                                case 'e': case 'E':
                                        /* no exponent without some digits */
                                        if ((flags&(NDIGITS|EXPOK)) == EXPOK) {
                                                flags =
                                                    (flags & ~(EXPOK|DPTOK)) |
                                                    SIGNOK | NDIGITS;
                                                goto fok;
                                        }
                                        break;
                                default:
                                        if (decimal_point == 0) {
                                                bzero(&mbs, sizeof(mbs));
                                                nconv = mbrtowc(&decimal_point,
                                                    localeconv()->decimal_point,
                                                    MB_CUR_MAX, &mbs);
                                                if (nconv == 0 ||
                                                    nconv == (size_t)-1 ||
                                                    nconv == (size_t)-2)
                                                        decimal_point = '.';
                                        }
                                        if (c == decimal_point &&
                                            (flags & DPTOK)) {
                                                flags &= ~(SIGNOK | DPTOK);
                                                goto fok;
                                        }
                                        break;
                                }
                                if (c != WEOF)
                                        __ungetwc(c, fp);
                                break;
                fok:
                                *p++ = c;
                        }
                        /*
                         * If no digits, might be missing exponent digits
                         * (just give back the exponent) or might be missing
                         * regular digits, but had sign and/or decimal point.
                         */
                        if (flags & NDIGITS) {
                                if (flags & EXPOK) {
                                        /* no digits at all */
                                        while (p > buf)
                                                __ungetwc(*--p, fp);
                                        goto match_failure;
                                }
                                /* just a bad exponent (e and maybe sign) */
                                c = *--p;
                                if (c != 'e' && c != 'E') {
                                        __ungetwc(c, fp);/* sign */
                                        c = *--p;
                                }
                                __ungetwc(c, fp);
                        }
                        if ((flags & SUPPRESS) == 0) {
                                *p = 0;
                                if (flags & LONGDBL) {
                                        long double res = wcstold(buf, NULL);
                                        *va_arg(ap, long double *) = res;
                                } else if (flags & LONG) {
                                        double res = wcstod(buf, NULL);
                                        *va_arg(ap, double *) = res;
                                } else {
                                        float res = wcstof(buf, NULL);
                                        *va_arg(ap, float *) = res;
                                }
                                nassigned++;
                        }
                        nread += p - buf;
                        nconversions++;
                        break;
#endif /* FLOATING_POINT */
                }
        }
input_failure:
        return (nconversions != 0 ? nassigned : EOF);
match_failure:
        return (nassigned);
}

int
vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, __va_list ap)
{
        int r;

        FLOCKFILE(fp);
        r = __vfwscanf(fp, fmt, ap);
        FUNLOCKFILE(fp);
        return (r);
}
DEF_STRONG(vfwscanf);