newlib-cygwin/newlib/libc/stdio/vfwscanf.c

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

/*
FUNCTION
<<vfwscanf>>, <<vwscanf>>, <<vswscanf>>---scan and format argument list from wide character input

INDEX
	vfwscanf
INDEX
	_vfwscanf
INDEX
	vwscanf
INDEX
	_vwscanf
INDEX
	vswscanf
INDEX
	_vswscanf

ANSI_SYNOPSIS
	#include <stdio.h>
	#include <stdarg.h>
	int vwscanf(const wchar_t *<[fmt]>, va_list <[list]>);
	int vfwscanf(FILE *<[fp]>, const wchar_t *<[fmt]>, va_list <[list]>);
	int vswscanf(const wchar_t *<[str]>, const wchar_t *<[fmt]>, va_list <[list]>);

	int _vwscanf(struct _reent *<[reent]>, const wchar_t *<[fmt]>,
                       va_list <[list]>);
	int _vfwscanf(struct _reent *<[reent]>, FILE *<[fp]>, const wchar_t *<[fmt]>,
                       va_list <[list]>);
	int _vswscanf(struct _reent *<[reent]>, const wchar_t *<[str]>,
                       const wchar_t *<[fmt]>, va_list <[list]>);

TRAD_SYNOPSIS
	#include <stdio.h>
	#include <varargs.h>
	int vwscanf( <[fmt]>, <[ist]>)
	wchar_t *<[fmt]>;
	va_list <[list]>;

	int vfwscanf( <[fp]>, <[fmt]>, <[list]>)
	FILE *<[fp]>;
	wchar_t *<[fmt]>;
	va_list <[list]>;

	int vswscanf( <[str]>, <[fmt]>, <[list]>)
	wchar_t *<[str]>;
	wchar_t *<[fmt]>;
	va_list <[list]>;

	int _vwscanf( <[reent]>, <[fmt]>, <[ist]>)
	struct _reent *<[reent]>;
	wchar_t *<[fmt]>;
	va_list <[list]>;

	int _vfwscanf( <[reent]>, <[fp]>, <[fmt]>, <[list]>)
	struct _reent *<[reent]>;
	FILE *<[fp]>;
	wchar_t *<[fmt]>;
	va_list <[list]>;

	int _vswscanf( <[reent]>, <[str]>, <[fmt]>, <[list]>)
	struct _reent *<[reent]>;
	wchar_t *<[str]>;
	wchar_t *<[fmt]>;
	va_list <[list]>;

DESCRIPTION
<<vwscanf>>, <<vfwscanf>>, and <<vswscanf>> are (respectively) variants
of <<wscanf>>, <<fwscanf>>, and <<swscanf>>.  They differ only in
allowing their caller to pass the variable argument list as a
<<va_list>> object (initialized by <<va_start>>) rather than
directly accepting a variable number of arguments.

RETURNS
The return values are consistent with the corresponding functions:
<<vwscanf>> returns the number of input fields successfully scanned,
converted, and stored; the return value does not include scanned
fields which were not stored.

If <<vwscanf>> attempts to read at end-of-file, the return value
is <<EOF>>.

If no fields were stored, the return value is <<0>>.

The routines <<_vwscanf>>, <<_vfwscanf>>, and <<_vswscanf>> are
reentrant versions which take an additional first parameter which points
to the reentrancy structure.

PORTABILITY
C99, POSIX-1.2008
*/

#include <_ansi.h>
#include <reent.h>
#include <newlib.h>
#include <ctype.h>
#include <wctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <limits.h>
#include <wchar.h>
#include <string.h>
#include <stdarg.h>
#include <errno.h>
#include "local.h"

#ifdef INTEGER_ONLY
#define VFWSCANF vfiwscanf
#define _VFWSCANF_R _vfiwscanf_r
#define __SVFWSCANF __svfiwscanf
#ifdef STRING_ONLY
#  define __SVFWSCANF_R __ssvfiwscanf_r
#else
#  define __SVFWSCANF_R __svfiwscanf_r
#endif
#else
#define VFWSCANF vfwscanf
#define _VFWSCANF_R _vfwscanf_r
#define __SVFWSCANF __svfwscanf
#ifdef STRING_ONLY
#  define __SVFWSCANF_R __ssvfwscanf_r
#else
#  define __SVFWSCANF_R __svfwscanf_r
#endif
#ifndef NO_FLOATING_POINT
#define FLOATING_POINT
#endif
#endif

#ifdef STRING_ONLY
#undef _flockfile
#undef _funlockfile
#define _flockfile(x) {}
#define _funlockfile(x) {}
#define _ungetwc_r _sungetwc_r
#define __srefill_r __ssrefill_r
#define _fgetwc_r _sfgetwc_r
#endif

#ifdef FLOATING_POINT
#include <math.h>
#include <float.h>

/* Currently a test is made to see if long double processing is warranted.
   This could be changed in the future should the _ldtoa_r code be
   preferred over _dtoa_r.  */
#define _NO_LONGDBL
#if defined _WANT_IO_LONG_DOUBLE && (LDBL_MANT_DIG > DBL_MANT_DIG)
#undef _NO_LONGDBL
extern _LONG_DOUBLE _wcstold_r _PARAMS((wchar_t *s, wchar_t **sptr));
#endif

#include "floatio.h"

#if ((MAXEXP+MAXFRACT+3) > MB_LEN_MAX)
#  define BUF (MAXEXP+MAXFRACT+3)        /* 3 = sign + decimal point + NUL */
#else
#  define BUF MB_LEN_MAX
#endif

/* An upper bound for how long a long prints in decimal.  4 / 13 approximates
   log (2).  Add one char for roundoff compensation and one for the sign.  */
#define MAX_LONG_LEN ((CHAR_BIT * sizeof (long)  - 1) * 4 / 13 + 2)
#else
#define	BUF	40
#endif

#define _NO_LONGLONG
#if defined _WANT_IO_LONG_LONG \
	&& (defined __GNUC__ || __STDC_VERSION__ >= 199901L)
# undef _NO_LONGLONG
#endif

#define _NO_POS_ARGS
#ifdef _WANT_IO_POS_ARGS
# undef _NO_POS_ARGS
# ifdef NL_ARGMAX
#  define MAX_POS_ARGS NL_ARGMAX
# else
#  define MAX_POS_ARGS 32
# endif

static void * get_arg (int, va_list *, int *, void **);
#endif /* _WANT_IO_POS_ARGS */

/*
 * Flags used during conversion.
 */

#define	LONG		0x01	/* l: long or double */
#define	LONGDBL		0x02	/* L/ll: long double or long long */
#define	SHORT		0x04	/* h: short */
#define CHAR		0x08	/* hh: 8 bit integer */
#define	SUPPRESS	0x10	/* suppress assignment */
#define	POINTER		0x20	/* weird %p pointer (`fake hex') */
#define	NOSKIP		0x40	/* do not skip blanks */

/*
 * The following are used in numeric conversions only:
 * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
 */

#define	SIGNOK		0x80	/* +/- is (still) legal */
#define	NDIGITS		0x100	/* no digits detected */

#define	DPTOK		0x200	/* (float) decimal point is still legal */
#define	EXPOK		0x400	/* (float) exponent (e+3, etc) still legal */

#define	PFXOK		0x200	/* 0x prefix is (still) legal */
#define	NZDIGITS	0x400	/* no zero digits detected */
#define HAVESIGN        0x10000 /* sign 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., wcstol or wcstoul */
#define	CT_FLOAT	4	/* floating, i.e., wcstod */

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

/*
 * vfwscanf
 */

#ifndef STRING_ONLY

#ifndef _REENT_ONLY

int
_DEFUN(VFWSCANF, (fp, fmt, ap),
       register FILE *fp _AND
       _CONST wchar_t *fmt _AND
       va_list ap)
{
  CHECK_INIT(_REENT, fp);
  return __SVFWSCANF_R (_REENT, fp, fmt, ap);
}

int
_DEFUN(__SVFWSCANF, (fp, fmt0, ap),
       register FILE *fp _AND
       wchar_t _CONST *fmt0 _AND
       va_list ap)
{
  return __SVFWSCANF_R (_REENT, fp, fmt0, ap);
}

#endif /* !_REENT_ONLY */

int
_DEFUN(_VFWSCANF_R, (data, fp, fmt, ap),
       struct _reent *data _AND
       register FILE *fp   _AND
       _CONST wchar_t *fmt    _AND
       va_list ap)
{
  CHECK_INIT(data, fp);
  return __SVFWSCANF_R (data, fp, fmt, ap);
}
#endif /* !STRING_ONLY */

#ifdef STRING_ONLY
/* When dealing with the swscanf family, we don't want to use the
 * regular ungetwc which will drag in file I/O items we don't need.
 * So, we create our own trimmed-down version.  */
static wint_t
_DEFUN(_sungetwc_r, (data, fp, ch),
	struct _reent *data _AND
	wint_t wc           _AND
	register FILE *fp)
{
  if (wc == WEOF)
    return (WEOF);

  /* After ungetc, we won't be at eof anymore */
  fp->_flags &= ~__SEOF;

  /*
   * If we are in the middle of ungetwc'ing, just continue.
   * This may require expanding the current ungetc buffer.
   */

  if (HASUB (fp))
    {
      if (fp->_r >= fp->_ub._size && __submore (data, fp))
        {
          return EOF;
        }
      fp->_p -= sizeof (wchar_t);
      *fp->_p = (wchar_t) wc;
      fp->_r += sizeof (wchar_t);
      return wc;
    }

  /*
   * If we can handle this by simply backing up, do so,
   * but never replace the original character.
   * (This makes swscanf() work when scanning `const' data.)
   */

  if (fp->_bf._base != NULL && fp->_p > fp->_bf._base
      && ((wchar_t *)fp->_p)[-1] == wc)
    {
      fp->_p -= sizeof (wchar_t);
      fp->_r += sizeof (wchar_t);
      return wc;
    }

  /*
   * Create an ungetc buffer.
   * Initially, we will use the `reserve' buffer.
   */

  fp->_ur = fp->_r;
  fp->_up = fp->_p;
  fp->_ub._base = fp->_ubuf;
  fp->_ub._size = sizeof (fp->_ubuf);
  fp->_p = &fp->_ubuf[sizeof (fp->_ubuf) - sizeof (wchar_t)];
  *(wchar_t *) fp->_p = wc;
  fp->_r = 2;
  return wc;
}

extern int __ssrefill_r _PARAMS ((struct _reent *ptr, register FILE * fp));

static size_t
_DEFUN(_sfgetwc_r, (ptr, fp),
       struct _reent * ptr _AND
       FILE * fp)
{
  wchar_t wc;

  if (fp->_r <= 0 && __ssrefill_r (ptr, fp))
    return (WEOF);
  wc = *(wchar_t *) fp->_p;
  fp->_p += sizeof (wchar_t);
  fp->_r -= sizeof (wchar_t);
  return (wc);
}
#endif /* STRING_ONLY */

int
_DEFUN(__SVFWSCANF_R, (rptr, fp, fmt0, ap),
       struct _reent *rptr _AND
       register FILE *fp   _AND
       wchar_t _CONST *fmt0   _AND
       va_list ap)
{
  register wchar_t *fmt = (wchar_t *) fmt0;
  register wint_t c;            /* character from format, or conversion */
  register size_t width;	/* field width, or 0 */
  register wchar_t *p = NULL;	/* points into all kinds of strings */
  register int n;		/* handy integer */
  register int flags;		/* flags as defined above */
  register wchar_t *p0;		/* saves original value of p when necessary */
  int nassigned;		/* number of fields assigned */
  int nread;			/* number of characters consumed from fp */
#ifndef _NO_POS_ARGS
  int N;			/* arg number */
  int arg_index = 0;		/* index into args processed directly */
  int numargs = 0;		/* number of varargs read */
  void *args[MAX_POS_ARGS];	/* positional args read */
  int is_pos_arg;		/* is current format positional? */
#endif
  int base = 0;			/* base argument to wcstol/wcstoul */

  mbstate_t mbs;                /* value to keep track of multibyte state */

  #define CCFN_PARAMS	_PARAMS((struct _reent *, const wchar_t *, wchar_t **, int))
  unsigned long (*ccfn)CCFN_PARAMS=0;	/* conversion function (wcstol/wcstoul) */
  wchar_t buf[BUF];		/* buffer for numeric conversions */
  const wchar_t *ccls;          /* character class start */
  const wchar_t *ccle;          /* character class end */
  int cclcompl = 0;             /* ccl is complemented? */
  wint_t wi;                    /* handy wint_t */
  char *mbp = NULL;             /* multibyte string pointer for %c %s %[ */
  size_t nconv;                 /* number of bytes in mb. conversion */
  char mbbuf[MB_LEN_MAX];       /* temporary mb. character buffer */

  char *cp;
  short *sp;
  int *ip;
#ifdef FLOATING_POINT
  float *flp;
  _LONG_DOUBLE *ldp;
  double *dp;
#endif
  long *lp;
#ifndef _NO_LONGLONG
  long long *llp;
#endif

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

  /* Macro to support positional arguments */
#ifndef _NO_POS_ARGS
# define GET_ARG(n, ap, type)					\
  ((type) (is_pos_arg						\
	   ? (n < numargs					\
	      ? args[n]						\
	      : get_arg (n, &ap, &numargs, args))		\
	   : (arg_index++ < numargs				\
	      ? args[n]						\
	      : (numargs < MAX_POS_ARGS				\
		 ? args[numargs++] = va_arg (ap, void *)	\
		 : va_arg (ap, void *)))))
#else
# define GET_ARG(n, ap, type) (va_arg (ap, type))
#endif

  __sfp_lock_acquire ();
  _flockfile (fp);

  ORIENT (fp, 1);

  nassigned = 0;
  nread = 0;
  ccls = ccle = NULL;
  for (;;)
    {
      c = *fmt++;
      if (c == L'\0')
	goto all_done;
      if (iswspace (c))
	{
	  while ((c = _fgetwc_r (rptr, fp)) != WEOF && iswspace(c))
	    ;
	  if (c != WEOF)
	    _ungetwc_r (rptr, c, fp);
	  continue;
	}
      if (c != L'%')
	goto literal;
      width = 0;
      flags = 0;
#ifndef _NO_POS_ARGS
      N = arg_index;
      is_pos_arg = 0;
#endif

      /*
       * switch on the format.  continue if done; break once format
       * type is derived.
       */

    again:
      c = *fmt++;

      switch (c)
	{
	case L'%':
	literal:
	  if ((wi = _fgetwc_r (rptr, fp)) == WEOF)
	    goto input_failure;
	  if (wi != c)
	    {
	      _ungetwc_r (rptr, wi, fp);
	      goto input_failure;
	    }
	  nread++;
	  continue;

	case L'*':
	  flags |= SUPPRESS;
	  goto again;
	case L'l':
#if defined _WANT_IO_C99_FORMATS || !defined _NO_LONGLONG
	  if (*fmt == L'l')	/* Check for 'll' = long long (SUSv3) */
	    {
	      ++fmt;
	      flags |= LONGDBL;
	    }
	  else
#endif
	    flags |= LONG;
	  goto again;
	case L'L':
	  flags |= LONGDBL;
	  goto again;
	case L'h':
#ifdef _WANT_IO_C99_FORMATS
	  if (*fmt == 'h')	/* Check for 'hh' = char int (SUSv3) */
	    {
	      ++fmt;
	      flags |= CHAR;
	    }
	  else
#endif
	    flags |= SHORT;
	  goto again;
#ifdef _WANT_IO_C99_FORMATS
	case L'j': /* intmax_t */
	  if (sizeof (intmax_t) == sizeof (long))
	    flags |= LONG;
	  else
	    flags |= LONGDBL;
	  goto again;
	case L't': /* ptrdiff_t */
	  if (sizeof (ptrdiff_t) < sizeof (int))
	    /* POSIX states ptrdiff_t is 16 or more bits, as
	       is short.  */
	    flags |= SHORT;
	  else if (sizeof (ptrdiff_t) == sizeof (int))
	    /* no flag needed */;
	  else if (sizeof (ptrdiff_t) <= sizeof (long))
	    flags |= LONG;
	  else
	    /* POSIX states that at least one programming
	       environment must support ptrdiff_t no wider than
	       long, but that means other environments can
	       have ptrdiff_t as wide as long long.  */
	    flags |= LONGDBL;
	  goto again;
	case L'z': /* size_t */
	  if (sizeof (size_t) < sizeof (int))
	    /* POSIX states size_t is 16 or more bits, as is short.  */
	    flags |= SHORT;
	  else if (sizeof (size_t) == sizeof (int))
	    /* no flag needed */;
	  else if (sizeof (size_t) <= sizeof (long))
	    flags |= LONG;
	  else
	    /* POSIX states that at least one programming
	       environment must support size_t no wider than
	       long, but that means other environments can
	       have size_t as wide as long long.  */
	    flags |= LONGDBL;
	  goto again;
#endif /* _WANT_IO_C99_FORMATS */

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

#ifndef _NO_POS_ARGS
	case L'$':
	  if (width <= MAX_POS_ARGS)
	    {
	      N = width - 1;
	      is_pos_arg = 1;
	      width = 0;
	      goto again;
	    }
	  rptr->_errno = EINVAL;
	  goto input_failure;
#endif /* !_NO_POS_ARGS */

	case L'd':
	  c = CT_INT;
	  ccfn = (unsigned long (*)CCFN_PARAMS)_wcstol_r;
	  base = 10;
	  break;

	case L'i':
	  c = CT_INT;
	  ccfn = (unsigned long (*)CCFN_PARAMS)_wcstol_r;
	  base = 0;
	  break;

	case L'o':
	  c = CT_INT;
	  ccfn = _wcstoul_r;
	  base = 8;
	  break;

	case L'u':
	  c = CT_INT;
	  ccfn = _wcstoul_r;
	  base = 10;
	  break;

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

#ifdef FLOATING_POINT
# ifdef _WANT_IO_C99_FORMATS
	case L'A':
	case L'a':
	case L'F':
# endif
	case L'E':
	case L'G':
	case L'e':
	case L'f':
	case L'g':
	  c = CT_FLOAT;
	  break;
#endif

#ifdef _WANT_IO_C99_FORMATS
	case L'S':
	  flags |= LONG;
	  /* FALLTHROUGH */
#endif

	case L's':
	  c = CT_STRING;
	  break;

	case L'[':
	  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;

#ifdef _WANT_IO_C99_FORMATS
	case 'C':
	  flags |= LONG;
	  /* FALLTHROUGH */
#endif

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

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

	case 'n':
	  if (flags & SUPPRESS)	/* ??? */
	    continue;
#ifdef _WANT_IO_C99_FORMATS
	  if (flags & CHAR)
	    {
	      cp = GET_ARG (N, ap, char *);
	      *cp = nread;
	    }
	  else
#endif
	  if (flags & SHORT)
	    {
	      sp = GET_ARG (N, ap, short *);
	      *sp = nread;
	    }
	  else if (flags & LONG)
	    {
	      lp = GET_ARG (N, ap, long *);
	      *lp = nread;
	    }
#ifndef _NO_LONGLONG
	  else if (flags & LONGDBL)
	    {
	      llp = GET_ARG (N, ap, long long*);
	      *llp = nread;
	    }
#endif
	  else
	    {
	      ip = GET_ARG (N, ap, int *);
	      *ip = nread;
	    }
	  continue;

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

	default:		/* compat */
	  goto match_failure;
	}

      /*
       * Consume leading white space, except for formats that
       * suppress this.
       */
      if ((flags & NOSKIP) == 0)
	{
	  while ((wi = _fgetwc_r (rptr, fp)) != WEOF && iswspace (wi))
	    nread++;
	  if (wi == WEOF)
	    goto input_failure;
	  _ungetwc_r (rptr, 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_r (rptr, 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 ((_PTR)&mbs, '\0', sizeof (mbstate_t));
	      while (width != 0 && (wi = _fgetwc_r (rptr, fp)) != WEOF)
		{
		  if (width >= MB_CUR_MAX && !(flags & SUPPRESS))
		    {
		      nconv = _wcrtomb_r (rptr, mbp, wi, &mbs);
		      if (nconv == (size_t) -1)
			goto input_failure;
		    }
		  else
		    {
		      nconv = _wcrtomb_r (rptr, mbbuf, wi, &mbs);
		      if (nconv == (size_t) -1)
			goto input_failure;
		      if (nconv > width)
			{
			  _ungetwc_r (rptr, 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++;
	    }
	  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_r (rptr, fp)) != WEOF
		     && width-- != 0 && INCCL (wi))
		n++;
	      if (wi != WEOF)
		_ungetwc_r (rptr, wi, fp);
	      if (n == 0)
		goto match_failure;
	    }
	  else if (flags & LONG)
	    {
	      p0 = p = va_arg(ap, wchar_t *);
	      while ((wi = _fgetwc_r (rptr, fp)) != WEOF
		     && width-- != 0 && INCCL (wi))
		*p++ = (wchar_t) wi;
	      if (wi != WEOF)
		_ungetwc_r (rptr, wi, fp);
	      n = p - p0;
	      if (n == 0)
		goto match_failure;
	    }
	  else
	    {
	      if (!(flags & SUPPRESS))
		mbp = va_arg(ap, char *);
	      n = 0;
	      memset ((_PTR) &mbs, '\0', sizeof (mbstate_t));
	      while ((wi = _fgetwc_r (rptr, fp)) != WEOF
		     && width-- != 0 && INCCL (wi))
		{
		  if (width >= MB_CUR_MAX && !(flags & SUPPRESS))
		    {
		      nconv = _wcrtomb_r (rptr, 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_r (rptr, wi, fp);
	      if (!(flags & SUPPRESS))
		{
		  *mbp = 0;
		  nassigned++;
		}
	    }
	  nread += n;
	  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_r (rptr, fp)) != WEOF
		     && width-- != 0 && !iswspace (wi))
		nread++;
	      if (wi != WEOF)
		_ungetwc_r (rptr, wi, fp);
	    }
	  else if (flags & LONG)
	    {
	      p0 = p = va_arg(ap, wchar_t *);
	      while ((wi = _fgetwc_r (rptr, fp)) != WEOF
		     && width-- != 0 && !iswspace (wi))
		{
		  *p++ = (wchar_t) wi;
		  nread++;
		}
	      if (wi != WEOF)
		_ungetwc_r (rptr, wi, fp);
	      *p = '\0';
	      nassigned++;
	    }
	  else
	    {
	      if (!(flags & SUPPRESS))
		mbp = va_arg(ap, char *);
	      memset ((_PTR) &mbs, '\0', sizeof (mbstate_t));
	      while ((wi = _fgetwc_r (rptr, 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_r (rptr, wi, fp);
	      if (!(flags & SUPPRESS))
		{
		  *mbp = 0;
		  nassigned++;
		}
	    }
	  continue;

	case CT_INT:
	{
	  /* scan an integer as if by wcstol/wcstoul */
	  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_r (rptr, 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 L'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 L'1':
		case L'2':
		case L'3':
		case L'4':
		case L'5':
		case L'6':
		case L'7':
		  base = basefix[base];
		  flags &= ~(SIGNOK | PFXOK | NDIGITS);
		  goto ok;

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

		  /* letters ok iff hex */
		case L'A':
		case L'B':
		case L'C':
		case L'D':
		case L'E':
		case L'F':
		case L'a':
		case L'b':
		case L'c':
		case L'd':
		case L'e':
		case L'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 L'+':
		case L'-':
		  if (flags & SIGNOK)
		    {
		      flags &= ~SIGNOK;
		      flags |= HAVESIGN;
		      goto ok;
		    }
		  break;

		  /* x ok iff flag still set & single 0 seen */
		case L'x':
		case L'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_r (rptr, 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'.
	   * Use of ungetc here and below assumes ASCII encoding; we are only
	   * pushing back 7-bit characters, so casting to unsigned char is
	   * not necessary.
	   */
	  if (flags & NDIGITS)
	    {
	      if (p > buf)
		_ungetwc_r (rptr, *--p, fp); /* [-+xX] */
	      goto match_failure;
	    }
	  c = p[-1];
	  if (c == L'x' || c == L'X')
	    {
	      --p;
	      _ungetwc_r (rptr, c, fp);
	    }
	  if ((flags & SUPPRESS) == 0)
	    {
	      unsigned long res;

	      *p = 0;
	      res = (*ccfn) (rptr, buf, (wchar_t **) NULL, base);
	      if (flags & POINTER)
		{
		  void **vp = GET_ARG (N, ap, void **);
#ifndef _NO_LONGLONG
		  if (sizeof (uintptr_t) > sizeof (unsigned long))
		    {
		      unsigned long long resll;
		      resll = _wcstoull_r (rptr, buf, (wchar_t **) NULL, base);
		      *vp = (void *) (uintptr_t) resll;
		    }
		  else
#endif /* !_NO_LONGLONG */
		    *vp = (void *) (uintptr_t) res;
		}
#ifdef _WANT_IO_C99_FORMATS
	      else if (flags & CHAR)
		{
		  cp = GET_ARG (N, ap, char *);
		  *cp = res;
		}
#endif
	      else if (flags & SHORT)
		{
		  sp = GET_ARG (N, ap, short *);
		  *sp = res;
		}
	      else if (flags & LONG)
		{
		  lp = GET_ARG (N, ap, long *);
		  *lp = res;
		}
#ifndef _NO_LONGLONG
	      else if (flags & LONGDBL)
		{
		  unsigned long long resll;
		  if (ccfn == _wcstoul_r)
		    resll = _wcstoull_r (rptr, buf, (wchar_t **) NULL, base);
		  else
		    resll = _wcstoll_r (rptr, buf, (wchar_t **) NULL, base);
		  llp = GET_ARG (N, ap, long long*);
		  *llp = resll;
		}
#endif
	      else
		{
		  ip = GET_ARG (N, ap, int *);
		  *ip = res;
		}
	      nassigned++;
	    }
	  nread += p - buf;
	  break;
	}
#ifdef FLOATING_POINT
	case CT_FLOAT:
	{
	  /* scan a floating point number as if by wcstod */
	  /* This code used to assume that the number of digits is reasonable.
	     However, ANSI / ISO C makes no such stipulation; we have to get
	     exact results even when there is an unreasonable amount of
	     leading zeroes.  */
	  long leading_zeroes = 0;
	  long zeroes, exp_adjust;
	  wchar_t *exp_start = NULL;
	  unsigned width_left = 0;
	  char nancount = 0;
	  char infcount = 0;
#ifdef hardway
	  if (width == 0 || width > sizeof (buf) - 1)
#else
	  /* size_t is unsigned, hence this optimisation */
	  if (width - 1 > sizeof (buf) - 2)
#endif
	    {
	      width_left = width - (sizeof (buf) - 1);
	      width = sizeof (buf) - 1;
	    }
	  flags |= SIGNOK | NDIGITS | DPTOK | EXPOK;
	  zeroes = 0;
	  exp_adjust = 0;
	  for (p = buf; width; )
	    {
	      c = _fgetwc_r (rptr, fp);
	      /*
	       * This code mimicks the integer conversion
	       * code, but is much simpler.
	       */
	      switch (c)
		{
		case L'0':
		  if (flags & NDIGITS)
		    {
		      flags &= ~SIGNOK;
		      zeroes++;
		      if (width_left)
			{
			  width_left--;
			  width++;
			}
		      goto fskip;
		    }
		  /* Fall through.  */
		case L'1':
		case L'2':
		case L'3':
		case L'4':
		case L'5':
		case L'6':
		case L'7':
		case L'8':
		case L'9':
		  if (nancount + infcount == 0)
		    {
		      flags &= ~(SIGNOK | NDIGITS);
		      goto fok;
		    }
		  break;

		case L'+':
		case L'-':
		  if (flags & SIGNOK)
		    {
		      flags &= ~SIGNOK;
		      goto fok;
		    }
		  break;
		case L'n':
		case L'N':
		  if (nancount == 0 && zeroes == 0
		      && (flags & (NDIGITS | DPTOK | EXPOK)) ==
				  (NDIGITS | DPTOK | EXPOK))
		    {
		      flags &= ~(SIGNOK | DPTOK | EXPOK | NDIGITS);
		      nancount = 1;
		      goto fok;
		    }
		  if (nancount == 2)
		    {
		      nancount = 3;
		      goto fok;
		    }
		  if (infcount == 1 || infcount == 4)
		    {
		      infcount++;
		      goto fok;
		    }
		  break;
		case L'a':
		case L'A':
		  if (nancount == 1)
		    {
		      nancount = 2;
		      goto fok;
		    }
		  break;
		case L'i':
		  if (infcount == 0 && zeroes == 0
		      && (flags & (NDIGITS | DPTOK | EXPOK)) ==
				  (NDIGITS | DPTOK | EXPOK))
		    {
		      flags &= ~(SIGNOK | DPTOK | EXPOK | NDIGITS);
		      infcount = 1;
		      goto fok;
		    }
		  if (infcount == 3 || infcount == 5)
		    {
		      infcount++;
		      goto fok;
		    }
		  break;
		case L'f':
		case L'F':
		  if (infcount == 2)
		    {
		      infcount = 3;
		      goto fok;
		    }
		  break;
		case L't':
		case L'T':
		  if (infcount == 6)
		    {
		      infcount = 7;
		      goto fok;
		    }
		  break;
		case L'y':
		case L'Y':
		  if (infcount == 7)
		    {
		      infcount = 8;
		      goto fok;
		    }
		  break;
		case L'.':
		  if (flags & DPTOK)
		    {
		      flags &= ~(SIGNOK | DPTOK);
		      leading_zeroes = zeroes;
		      goto fok;
		    }
		  break;
		case L'e':
		case L'E':
		  /* no exponent without some digits */
		  if ((flags & (NDIGITS | EXPOK)) == EXPOK
		      || ((flags & EXPOK) && zeroes))
		    {
		      if (! (flags & DPTOK))
			{
			  exp_adjust = zeroes - leading_zeroes;
			  exp_start = p;
			}
		      flags =
			(flags & ~(EXPOK | DPTOK)) |
			SIGNOK | NDIGITS;
		      zeroes = 0;
		      goto fok;
		    }
		  break;
		}
	      if (c != WEOF)
		_ungetwc_r (rptr, c, fp);
	      break;
	    fok:
	      *p++ = c;
	    fskip:
	      width--;
	      ++nread;
	    }
	  if (zeroes)
	    flags &= ~NDIGITS;
	  /* We may have a 'N' or possibly even [sign] 'N' 'a' as the
	     start of 'NaN', only to run out of chars before it was
	     complete (or having encountered a non-matching char).  So
	     check here if we have an outstanding nancount, and if so
	     put back the chars we did swallow and treat as a failed
	     match.

	     FIXME - we still don't handle NAN([0xdigits]).  */
	  if (nancount - 1U < 2U) /* nancount && nancount < 3 */
	    {
	      /* Newlib's ungetc works even if we called __srefill in
		 the middle of a partial parse, but POSIX does not
		 guarantee that in all implementations of ungetc.  */
	      while (p > buf)
		{
		  _ungetwc_r (rptr, *--p, fp); /* [-+nNaA] */
		  --nread;
		}
	      goto match_failure;
	    }
	  /* Likewise for 'inf' and 'infinity'.	 But be careful that
	     'infinite' consumes only 3 characters, leaving the stream
	     at the second 'i'.	 */
	  if (infcount - 1U < 7U) /* infcount && infcount < 8 */
	    {
	      if (infcount >= 3) /* valid 'inf', but short of 'infinity' */
		while (infcount-- > 3)
		  {
		    _ungetwc_r (rptr, *--p, fp); /* [iInNtT] */
		    --nread;
		  }
	      else
		{
		  while (p > buf)
		    {
		      _ungetwc_r (rptr, *--p, fp); /* [-+iInN] */
		      --nread;
		    }
		  goto match_failure;
		}
	    }
	  /*
	   * 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_r (rptr, *--p, fp); /* [-+.] */
		      --nread;
		    }
		  goto match_failure;
		}
	      /* just a bad exponent (e and maybe sign) */
	      c = *--p;
	      --nread;
	      if (c != L'e' && c != L'E')
		{
		  _ungetwc_r (rptr, c, fp); /* [-+] */
		  c = *--p;
		  --nread;
		}
	      _ungetwc_r (rptr, c, fp); /* [eE] */
	    }
	  if ((flags & SUPPRESS) == 0)
	    {
	      double res = 0;
#ifdef _NO_LONGDBL
#define QUAD_RES res;
#else  /* !_NO_LONG_DBL */
	      long double qres = 0;
#define QUAD_RES qres;
#endif /* !_NO_LONG_DBL */
	      long new_exp = 0;

	      *p = 0;
	      if ((flags & (DPTOK | EXPOK)) == EXPOK)
		{
		  exp_adjust = zeroes - leading_zeroes;
		  new_exp = -exp_adjust;
		  exp_start = p;
		}
	      else if (exp_adjust)
                new_exp = _wcstol_r (rptr, (exp_start + 1), NULL, 10) - exp_adjust;
	      if (exp_adjust)
		{

		  /* If there might not be enough space for the new exponent,
		     truncate some trailing digits to make room.  */
		  if (exp_start >= buf + sizeof (buf) - MAX_LONG_LEN)
		    exp_start = buf + sizeof (buf) - MAX_LONG_LEN - 1;
                 swprintf (exp_start, MAX_LONG_LEN, L"e%ld", new_exp);
		}

	      /* FIXME: We don't have wcstold yet. */
#if 0//ndef _NO_LONGDBL /* !_NO_LONGDBL */
	      if (flags & LONGDBL)
		qres = _wcstold_r (rptr, buf, NULL);
	      else
#endif
	        res = _wcstod_r (rptr, buf, NULL);

	      if (flags & LONG)
		{
		  dp = GET_ARG (N, ap, double *);
		  *dp = res;
		}
	      else if (flags & LONGDBL)
		{
		  ldp = GET_ARG (N, ap, _LONG_DOUBLE *);
		  *ldp = QUAD_RES;
		}
	      else
		{
		  flp = GET_ARG (N, ap, float *);
		  if (isnan (res))
		    *flp = nanf (NULL);
		  else
		    *flp = res;
		}
	      nassigned++;
	    }
	  break;
	}
#endif /* FLOATING_POINT */
	}
    }
input_failure:
  /* On read failure, return EOF failure regardless of matches; errno
     should have been set prior to here.  On EOF failure (including
     invalid format string), return EOF if no matches yet, else number
     of matches made prior to failure.  */
  _funlockfile (fp);
  __sfp_lock_release ();
  return nassigned && !(fp->_flags & __SERR) ? nassigned : EOF;
match_failure:
all_done:
  /* Return number of matches, which can be 0 on match failure.  */
  _funlockfile (fp);
  __sfp_lock_release ();
  return nassigned;
}

#ifndef _NO_POS_ARGS
/* Process all intermediate arguments.  Fortunately, with wscanf, all
   intermediate arguments are sizeof(void*), so we don't need to scan
   ahead in the format string.  */
static void *
get_arg (int n, va_list *ap, int *numargs_p, void **args)
{
  int numargs = *numargs_p;
  while (n >= numargs)
    args[numargs++] = va_arg (*ap, void *);
  *numargs_p = numargs;
  return args[n];
}
#endif /* !_NO_POS_ARGS */