diff --git a/libc/stdio/vfwscanf.cpp b/libc/stdio/vfwscanf.cpp
new file mode 100644
index 0000000..06f706a
--- /dev/null
+++ b/libc/stdio/vfwscanf.cpp
@@ -0,0 +1,641 @@
+/*	$OpenBSD: vfwscanf.c,v 1.4 2014/03/19 05:17:01 guenther 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"
+
+#include <platform/bionic/macros.h>
+
+#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 PFBOK    0x20000 /* 0x prefix is (still) legal */
+#define PFXOK    0x40000 /* 0x prefix is (still) legal */
+#define NZDIGITS 0x80000 /* 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 */
+
+// An interpretive version of __sccl from vfscanf.c --- a table of all wchar_t values would
+// be a little too expensive, and some kind of compressed version isn't worth the trouble.
+static inline bool in_ccl(wchar_t wc, const wchar_t* ccl) {
+  // Is this a negated set?
+  bool member_result = true;
+  if (*ccl == '^') {
+    member_result = false;
+    ++ccl;
+  }
+
+  // The first character may be ']' or '-' without being special.
+  if (*ccl == '-' || *ccl == ']') {
+    // A literal match?
+    if (*ccl == wc) return member_result;
+    ++ccl;
+  }
+
+  while (*ccl && *ccl != ']') {
+    // The last character may be '-' without being special.
+    if (*ccl == '-' && ccl[1] != '\0' && ccl[1] != ']') {
+      wchar_t first = *(ccl - 1);
+      wchar_t last = *(ccl + 1);
+      if (first <= last) {
+        // In the range?
+        if (wc >= first && wc <= last) return member_result;
+        ccl += 2;
+        continue;
+      }
+      // A '-' is not considered to be part of a range if the character after
+      // is not greater than the character before, so fall through...
+    }
+    // A literal match?
+    if (*ccl == wc) return member_result;
+    ++ccl;
+  }
+  return !member_result;
+}
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wframe-larger-than="
+
+/*
+ * 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* ccl;
+  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;
+
+  _SET_ORIENTATION(fp, 1);
+
+  nassigned = 0;
+  nconversions = 0;
+  nread = 0;
+  base = 0; /* XXX just to keep gcc happy */
+  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.
+       */
+      case 'b':
+        c = CT_INT;
+        base = 2;
+        flags |= PFBOK; /* enable 0b prefixing */
+        break;
+
+      case 'D': /* compat */
+        flags |= LONG;
+        __BIONIC_FALLTHROUGH;
+      case 'd':
+        c = CT_INT;
+        base = 10;
+        break;
+
+      case 'i':
+        c = CT_INT;
+        base = 0;
+        break;
+
+      case 'O': /* compat */
+        flags |= LONG;
+        __BIONIC_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;
+
+      case 'e':
+      case 'E':
+      case 'f':
+      case 'F':
+      case 'g':
+      case 'G':
+      case 'a':
+      case 'A':
+        c = CT_FLOAT;
+        break;
+
+      case 's':
+        c = CT_STRING;
+        break;
+
+      case '[':
+        ccl = fmt;
+        if (*fmt == '^') fmt++;
+        if (*fmt == ']') fmt++;
+        while (*fmt != '\0' && *fmt != ']') 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;
+          memset(&mbs, 0, 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:
+      case CT_STRING:
+        // CT_CCL: scan a (nonempty) character class (sets NOSKIP).
+        // CT_STRING: like CCL, but zero-length string OK, & no NOSKIP.
+        if (width == 0) width = (size_t)~0; // 'infinity'.
+        if ((flags & SUPPRESS) && (flags & LONG)) {
+          n = 0;
+          while ((wi = __fgetwc_unlock(fp)) != WEOF && width-- != 0 && ((c == CT_CCL && in_ccl(wi, ccl)) || (c == CT_STRING && !iswspace(wi)))) n++;
+          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 && ((c == CT_CCL && in_ccl(wi, ccl)) || (c == CT_STRING && !iswspace(wi)))) {
+            *p++ = (wchar_t)wi;
+          }
+          if (wi != WEOF) __ungetwc(wi, fp);
+          n = p - p0;
+        } else {
+          if (!(flags & SUPPRESS)) mbp = va_arg(ap, char*);
+          n = 0;
+          memset(&mbs, 0, sizeof(mbs));
+          while ((wi = __fgetwc_unlock(fp)) != WEOF && width != 0 && ((c == CT_CCL && in_ccl(wi, ccl)) || (c == CT_STRING && !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;
+            n++;
+          }
+          if (wi != WEOF) __ungetwc(wi, fp);
+        }
+        if (c == CT_CCL && n == 0) goto match_failure;
+        if (!(flags & SUPPRESS)) {
+          if (flags & LONG) {
+            *p = L'\0';
+          } else {
+            *mbp = '\0';
+          }
+          ++nassigned;
+        }
+        nread += n;
+        nconversions++;
+        break;
+
+      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 0b/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 |= PFBOK | PFXOK;
+              }
+              if (flags & NZDIGITS) {
+                flags &= ~(SIGNOK | NZDIGITS | NDIGITS);
+              } else {
+                flags &= ~(SIGNOK | PFBOK | PFXOK | NDIGITS);
+              }
+              goto ok;
+
+            /* 1 through 7 always legal */
+            case 'B':
+            case 'b':
+              // Is this 'b' potentially part of an "0b" prefix?
+              if ((flags & PFBOK) && p == buf + 1 + !!(flags & HAVESIGN)) {
+                base = 2;
+                flags &= ~PFBOK;
+                goto ok;
+              }
+              // No? Fall through and see if it's a hex digit instead then...
+              __BIONIC_FALLTHROUGH;
+            case '1':
+            case '2':
+            case '3':
+            case '4':
+            case '5':
+            case '6':
+            case '7':
+            case '8':
+            case '9':
+            case 'A':
+            case 'C':
+            case 'D':
+            case 'E':
+            case 'F':
+            case 'a':
+            case 'c':
+            case 'd':
+            case 'e':
+            case 'f':
+              if (base == 0) base = 10;
+              if (base != 16 && (int)(c - '0') >= base) break; /* not legal here */
+              flags &= ~(SIGNOK | PFBOK | 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 was `[-+]0[BbXx]`, push back and treat it
+         * as `[-+]0`.
+         */
+        if (flags & NDIGITS) {
+          if (p > buf) __ungetwc(*--p, fp);
+          goto match_failure;
+        }
+        c = p[-1];
+        if ((base == 2 && (c == 'b' || c == 'B')) || 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;
+
+      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;
+        if ((width = wparsefloat(fp, buf, buf + width)) == 0) goto match_failure;
+        if ((flags & SUPPRESS) == 0) {
+          if (flags & LONGDBL) {
+            long double res = wcstold(buf, &p);
+            *va_arg(ap, long double*) = res;
+          } else if (flags & LONG) {
+            double res = wcstod(buf, &p);
+            *va_arg(ap, double*) = res;
+          } else {
+            float res = wcstof(buf, &p);
+            *va_arg(ap, float*) = res;
+          }
+          if (p - buf != (ptrdiff_t)width) abort();
+          nassigned++;
+        }
+        nread += width;
+        nconversions++;
+        break;
+    }
+  }
+input_failure:
+  return (nconversions != 0 ? nassigned : EOF);
+match_failure:
+  return (nassigned);
+}
+#pragma GCC diagnostic pop