diff --git a/libc/stdio/vfscanf.cpp b/libc/stdio/vfscanf.cpp
new file mode 100644
index 0000000..f2e136c
--- /dev/null
+++ b/libc/stdio/vfscanf.cpp
@@ -0,0 +1,817 @@
+/*	$OpenBSD: vfscanf.c,v 1.31 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 <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/param.h>
+#include <wctype.h>
+#include "local.h"
+
+#include <private/bionic_ctype.h>
+#include <private/bionic_fortify.h>
+#include <private/bionic_mbstate.h>
+
+#define BUF 513 /* Maximum length of numeric string. */
+
+// Flags used during conversion.
+// Size/type:
+#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
+// Modifiers:
+#define SUPPRESS   0x00400 // *: suppress assignment
+#define UNSIGNED   0x00800 // %[oupxX] conversions
+#define ALLOCATE   0x01000 // m: allocate a char*
+// Internal use during integer parsing:
+#define SIGNOK     0x02000 // +/- is (still) legal
+#define HAVESIGN   0x04000 // Sign detected
+#define NDIGITS    0x08000 // No digits detected
+#define PFXOK      0x10000 // "0x" prefix is (still) legal
+#define NZDIGITS   0x20000 // 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: strtoimax/strtoumax
+#define CT_FLOAT 4  // Float: strtod
+
+static const unsigned char* __sccl(char*, const unsigned char*);
+
+/*
+ * Internal, unlocked version of vfscanf
+ */
+int __svfscanf(FILE* fp, const char* fmt0, va_list ap) {
+  const unsigned char* fmt = reinterpret_cast<const unsigned char*>(fmt0);
+  int c;            /* character from format, or conversion */
+  size_t width;     /* field width, or 0 */
+  char* p;
+  wchar_t* wcp;
+  size_t n;
+  int flags;        /* flags as defined above */
+  int nassigned;    /* number of fields assigned */
+  int nread;        /* number of characters consumed from fp */
+  int base;         /* base argument to strtoimax/strtouimax */
+  char ccltab[256]; /* character class table for %[...] */
+  char buf[BUF];    /* buffer for numeric conversions */
+  size_t nconv;     /* length of multibyte sequence converted */
+  mbstate_t mbs;
+  void* allocation = NULL; // Allocated but unassigned result for %mc/%ms/%m[.
+  size_t capacity = 0; // Number of char/wchar_t units allocated in `allocation`.
+
+  /* `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;
+  nread = 0;
+  for (;;) {
+    c = *fmt++;
+    if (c == 0) return nassigned;
+    if (IsSpace(c)) {
+      while ((fp->_r > 0 || __srefill(fp) == 0) && IsSpace(*fp->_p)) nread++, fp->_r--, fp->_p++;
+      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 (fp->_r <= 0 && __srefill(fp)) goto input_failure;
+        if (*fp->_p != c) goto match_failure;
+        fp->_r--, fp->_p++;
+        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 'm':
+        flags |= ALLOCATE;
+        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 '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;
+
+      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 '[':
+        fmt = __sccl(ccltab, 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':
+        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 (IsUpper(c)) flags |= LONG;
+        c = CT_INT;
+        base = 10;
+        break;
+    }
+
+    if ((flags & ALLOCATE) != 0 && c > CT_STRING) {
+      __fortify_fatal("scanf 'm' only works with %%c/%%s/%%[");
+    }
+    if ((flags & (ALLOCATE|SUPPRESS)) == (ALLOCATE|SUPPRESS)) {
+      __fortify_fatal("scanf 'm' makes no sense with '*'");
+    }
+
+    /*
+     * We have a conversion that requires input.
+     */
+    if (fp->_r <= 0 && __srefill(fp)) goto input_failure;
+
+    /*
+     * Consume leading white space, except for formats
+     * that suppress this.
+     */
+    if ((flags & NOSKIP) == 0) {
+      while (IsSpace(*fp->_p)) {
+        nread++;
+        if (--fp->_r > 0) {
+          fp->_p++;
+        } else if (__srefill(fp)) {
+          goto input_failure;
+        }
+      }
+      /*
+       * Note that there is at least one character in
+       * the buffer, so conversions that do not set NOSKIP
+       * ca no longer result in an input failure.
+       */
+    }
+
+    /*
+     * Do the conversion.
+     */
+    switch (c) {
+      case CT_CHAR:
+        /* scan arbitrary characters (sets NOSKIP) */
+        if (width == 0) width = 1;
+        if (flags & LONG) {
+          if (flags & ALLOCATE) {
+            allocation = wcp = reinterpret_cast<wchar_t*>(malloc(width * sizeof(wchar_t)));
+            if (allocation == NULL) goto allocation_failure;
+          } else if (flags & SUPPRESS) {
+            wcp = NULL;
+          } else {
+            wcp = va_arg(ap, wchar_t*);
+          }
+          size_t bytes = 0;
+          while (width != 0) {
+            if (bytes == MB_CUR_MAX) {
+              fp->_flags |= __SERR;
+              goto input_failure;
+            }
+            buf[bytes++] = *fp->_p;
+            fp->_p++;
+            fp->_r--;
+            memset(&mbs, 0, sizeof(mbs));
+            nconv = mbrtowc(wcp, buf, bytes, &mbs);
+            if (nconv == __MB_ERR_ILLEGAL_SEQUENCE) {
+              fp->_flags |= __SERR;
+              goto input_failure;
+            }
+            if (nconv == 0 && !(flags & SUPPRESS)) *wcp = L'\0';
+            if (nconv != __MB_ERR_INCOMPLETE_SEQUENCE) {
+              nread += bytes;
+              width--;
+              if (!(flags & SUPPRESS)) wcp++;
+              bytes = 0;
+            }
+            if (fp->_r <= 0 && __srefill(fp)) {
+              if (bytes != 0) {
+                fp->_flags |= __SERR;
+                goto input_failure;
+              }
+              break;
+            }
+          }
+          if (allocation != NULL) {
+            *va_arg(ap, wchar_t**) = reinterpret_cast<wchar_t*>(allocation);
+            allocation = NULL;
+          }
+          if (!(flags & SUPPRESS)) nassigned++;
+        } else if (flags & SUPPRESS) {
+          size_t sum = 0;
+          for (;;) {
+            if ((n = fp->_r) < width) {
+              sum += n;
+              width -= n;
+              fp->_p += n;
+              if (__srefill(fp)) {
+                if (sum == 0) goto input_failure;
+                break;
+              }
+            } else {
+              sum += width;
+              fp->_r -= width;
+              fp->_p += width;
+              break;
+            }
+          }
+          nread += sum;
+        } else {
+          if (flags & ALLOCATE) {
+            allocation = p = reinterpret_cast<char*>(malloc(width));
+            if (allocation == NULL) goto allocation_failure;
+          } else {
+            p = va_arg(ap, char*);
+          }
+          size_t r = fread(p, 1, width, fp);
+          if (r == 0) goto input_failure;
+          if (allocation != NULL) {
+            *va_arg(ap, char**) = reinterpret_cast<char*>(allocation);
+            allocation = NULL;
+          }
+          nread += r;
+          nassigned++;
+        }
+        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_MAX;
+        if (flags & LONG) {
+          // TODO: since no-one cares, replace this with a simple fgetwc loop?
+          n = 0;
+          if (flags & ALLOCATE) {
+            capacity = MIN(width, 32);
+            allocation = wcp = reinterpret_cast<wchar_t*>(malloc(sizeof(wchar_t) * capacity));
+            if (allocation == NULL) goto allocation_failure;
+          } else if (flags & SUPPRESS) {
+            wcp = NULL;
+          } else {
+            wcp = va_arg(ap, wchar_t*);
+          }
+          size_t bytes = 0;
+          while ((c == CT_CCL || !IsSpace(*fp->_p)) && width != 0) {
+            if (bytes == MB_CUR_MAX) {
+              fp->_flags |= __SERR;
+              goto input_failure;
+            }
+            buf[bytes++] = *fp->_p;
+            fp->_p++;
+            fp->_r--;
+            wchar_t wc = L'\0';
+            memset(&mbs, 0, sizeof(mbs));
+            nconv = mbrtowc(&wc, buf, bytes, &mbs);
+            if (nconv == __MB_ERR_ILLEGAL_SEQUENCE) {
+              fp->_flags |= __SERR;
+              goto input_failure;
+            }
+            if (nconv != __MB_ERR_INCOMPLETE_SEQUENCE) {
+              if ((c == CT_CCL && wctob(wc) != EOF && !ccltab[wctob(wc)]) || (c == CT_STRING && iswspace(wc))) {
+                while (bytes != 0) {
+                  bytes--;
+                  ungetc(buf[bytes], fp);
+                }
+                break;
+              }
+              if (wcp) wcp[n] = wc;
+              n++;
+              if (allocation != NULL && n == capacity) {
+                capacity *= 2;
+                wchar_t* new_allocation =
+                    reinterpret_cast<wchar_t*>(realloc(allocation, sizeof(wchar_t) * capacity));
+                if (new_allocation == NULL) goto allocation_failure;
+                allocation = wcp = new_allocation;
+              }
+              nread += bytes;
+              width--;
+              bytes = 0;
+            }
+            if (fp->_r <= 0 && __srefill(fp)) {
+              if (bytes != 0) {
+                fp->_flags |= __SERR;
+                goto input_failure;
+              }
+              break;
+            }
+          }
+          if (c == CT_CCL && bytes != 0) {
+            fp->_flags |= __SERR;
+            goto input_failure;
+          }
+          if (allocation != NULL) {
+            *va_arg(ap, wchar_t**) = reinterpret_cast<wchar_t*>(allocation);
+            allocation = NULL;
+          }
+        } else if (flags & SUPPRESS) {
+          n = 0;
+          while ((c == CT_CCL && ccltab[*fp->_p]) || (c == CT_STRING && !IsSpace(*fp->_p))) {
+            n++, fp->_r--, fp->_p++;
+            if (--width == 0) break;
+            if (fp->_r <= 0 && __srefill(fp)) {
+              if (c == CT_CCL && n == 0) goto input_failure;
+              break;
+            }
+          }
+          nread += n;
+        } else {
+          if (flags & ALLOCATE) {
+            capacity = MIN(width, 32);
+            allocation = p = reinterpret_cast<char*>(malloc(capacity));
+            if (allocation == NULL) goto allocation_failure;
+          } else {
+            p = va_arg(ap, char*);
+          }
+          n = 0;
+          while ((c == CT_CCL && ccltab[*fp->_p]) || (c == CT_STRING && !IsSpace(*fp->_p))) {
+            fp->_r--;
+            p[n++] = *fp->_p++;
+            if (allocation != NULL && n == capacity) {
+              capacity *= 2;
+              char* new_allocation = reinterpret_cast<char*>(realloc(allocation, capacity));
+              if (new_allocation == NULL) goto allocation_failure;
+              allocation = p = new_allocation;
+            }
+            if (--width == 0) break;
+            if (fp->_r <= 0 && __srefill(fp)) {
+              if (c == CT_CCL && n == 0) goto input_failure;
+              break;
+            }
+          }
+          nread += n;
+          if (allocation != NULL) {
+            *va_arg(ap, char**) = reinterpret_cast<char*>(allocation);
+            allocation = NULL;
+          }
+        }
+        if (c == CT_CCL && n == 0) goto match_failure;
+        if (!(flags & SUPPRESS)) {
+          if (flags & LONG) {
+            wcp[n] = L'\0';
+          } else {
+            p[n] = '\0';
+          }
+          ++nassigned;
+        }
+        break;
+
+      case CT_INT:
+        /* scan an integer as if by strtoimax/strtoumax */
+#ifdef hardway
+        if (width == 0 || width > sizeof(buf) - 1) width = sizeof(buf) - 1;
+#else
+        /* size_t is unsigned, hence this optimisation */
+        if (--width > sizeof(buf) - 2) width = sizeof(buf) - 2;
+        width++;
+#endif
+        flags |= SIGNOK | NDIGITS | NZDIGITS;
+        for (p = buf; width; width--) {
+          c = *fp->_p;
+          /*
+           * 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.
+           */
+          break;
+        ok:
+          /*
+           * c is legal: store it and look at the next.
+           */
+          *p++ = c;
+          if (--fp->_r > 0)
+            fp->_p++;
+          else if (__srefill(fp))
+            break; /* EOF */
+        }
+        /*
+         * 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) (void)ungetc(*(u_char*)--p, fp);
+          goto match_failure;
+        }
+        c = ((u_char*)p)[-1];
+        if (c == 'x' || c == 'X') {
+          --p;
+          (void)ungetc(c, fp);
+        }
+        if ((flags & SUPPRESS) == 0) {
+          uintmax_t res;
+
+          *p = '\0';
+          if (flags & UNSIGNED) {
+            res = strtoumax(buf, NULL, base);
+          } else {
+            res = strtoimax(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;
+        break;
+
+      case CT_FLOAT:
+        /* scan a floating point number as if by strtod */
+        if (width == 0 || width > sizeof(buf) - 1) width = sizeof(buf) - 1;
+        if ((width = parsefloat(fp, buf, buf + width)) == 0) goto match_failure;
+        if ((flags & SUPPRESS) == 0) {
+          if (flags & LONGDBL) {
+            long double res = strtold(buf, &p);
+            *va_arg(ap, long double*) = res;
+          } else if (flags & LONG) {
+            double res = strtod(buf, &p);
+            *va_arg(ap, double*) = res;
+          } else {
+            float res = strtof(buf, &p);
+            *va_arg(ap, float*) = res;
+          }
+          if ((size_t)(p - buf) != width) abort();
+          nassigned++;
+        }
+        nread += width;
+        break;
+    }
+  }
+allocation_failure:
+input_failure:
+  free(allocation);
+  if (nassigned == 0) nassigned = -1;
+match_failure:
+  return nassigned;
+}
+
+/*
+ * Fill in the given table from the scanset at the given format
+ * (just after `[').  Return a pointer to the character past the
+ * closing `]'.  The table has a 1 wherever characters should be
+ * considered part of the scanset.
+ */
+static const unsigned char* __sccl(char* tab, const unsigned char* fmt) {
+  int c, n, v;
+
+  /* first `clear' the whole table */
+  c = *fmt++; /* first char hat => negated scanset */
+  if (c == '^') {
+    v = 1;      /* default => accept */
+    c = *fmt++; /* get new first char */
+  } else
+    v = 0; /* default => reject */
+  /* should probably use memset here */
+  for (n = 0; n < 256; n++) tab[n] = v;
+  if (c == 0) return (fmt - 1); /* format ended before closing ] */
+
+  /*
+   * Now set the entries corresponding to the actual scanset
+   * to the opposite of the above.
+   *
+   * The first character may be ']' (or '-') without being special;
+   * the last character may be '-'.
+   */
+  v = 1 - v;
+  for (;;) {
+    tab[c] = v; /* take character c */
+  doswitch:
+    n = *fmt++; /* and examine the next */
+    switch (n) {
+      case 0: /* format ended too soon */
+        return (fmt - 1);
+
+      case '-':
+        /*
+         * A scanset of the form
+         *	[01+-]
+         * is defined as `the digit 0, the digit 1,
+         * the character +, the character -', but
+         * the effect of a scanset such as
+         *	[a-zA-Z0-9]
+         * is implementation defined.  The V7 Unix
+         * scanf treats `a-z' as `the letters a through
+         * z', but treats `a-a' as `the letter a, the
+         * character -, and the letter a'.
+         *
+         * For compatibility, the `-' is not considerd
+         * to define a range if the character following
+         * it is either a close bracket (required by ANSI)
+         * or is not numerically greater than the character
+         * we just stored in the table (c).
+         */
+        n = *fmt;
+        if (n == ']' || n < c) {
+          c = '-';
+          break; /* resume the for(;;) */
+        }
+        fmt++;
+        do { /* fill in the range */
+          tab[++c] = v;
+        } while (c < n);
+#if 1 /* XXX another disgusting compatibility hack */
+        /*
+         * Alas, the V7 Unix scanf also treats formats
+         * such as [a-c-e] as `the letters a through e'.
+         * This too is permitted by the standard....
+         */
+        goto doswitch;
+#else
+        c = *fmt++;
+        if (c == 0) return (fmt - 1);
+        if (c == ']') return (fmt);
+#endif
+        break;
+
+      case ']': /* end of scanset */
+        return fmt;
+
+      default: /* just another character */
+        c = n;
+        break;
+    }
+  }
+  /* NOTREACHED */
+}