newlib-cygwin/newlib/libc/stdio/vfscanf.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
<<vfscanf>>, <<vscanf>>, <<vsscanf>>---format argument list

INDEX
	vfscanf
INDEX
	_vfscanf_r
INDEX
	vscanf
INDEX
	_vscanf_r
INDEX
	vsscanf
INDEX
	_vsscanf_r

SYNOPSIS
	#include <stdio.h>
	#include <stdarg.h>
	int vscanf(const char *<[fmt]>, va_list <[list]>);
	int vfscanf(FILE *<[fp]>, const char *<[fmt]>, va_list <[list]>);
	int vsscanf(const char *<[str]>, const char *<[fmt]>, va_list <[list]>);

	int _vscanf_r(struct _reent *<[reent]>, const char *<[fmt]>,
                       va_list <[list]>);
	int _vfscanf_r(struct _reent *<[reent]>, FILE *<[fp]>, const char *<[fmt]>,
                       va_list <[list]>);
	int _vsscanf_r(struct _reent *<[reent]>, const char *<[str]>,
                       const char *<[fmt]>, va_list <[list]>);

DESCRIPTION
<<vscanf>>, <<vfscanf>>, and <<vsscanf>> are (respectively) variants
of <<scanf>>, <<fscanf>>, and <<sscanf>>.  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:
<<vscanf>> returns the number of input fields successfully scanned,
converted, and stored; the return value does not include scanned
fields which were not stored.

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

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

The routines <<_vscanf_r>>, <<_vfscanf_f>>, and <<_vsscanf_r>> are
reentrant versions which take an additional first parameter which points to the
reentrancy structure.

PORTABILITY
These are GNU extensions.

Supporting OS subroutines required:
*/

#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"
#include "../stdlib/local.h"

#ifdef INTEGER_ONLY
#define VFSCANF vfiscanf
#define _VFSCANF_R _vfiscanf_r
#define __SVFSCANF __svfiscanf
#ifdef STRING_ONLY
#  define __SVFSCANF_R __ssvfiscanf_r
#else
#  define __SVFSCANF_R __svfiscanf_r
#endif
#else
#define VFSCANF vfscanf
#define _VFSCANF_R _vfscanf_r
#define __SVFSCANF __svfscanf
#ifdef STRING_ONLY
#  define __SVFSCANF_R __ssvfscanf_r
#else
#  define __SVFSCANF_R __svfscanf_r
#endif
#ifndef NO_FLOATING_POINT
#define FLOATING_POINT
#endif
#endif

#ifdef STRING_ONLY
#undef _newlib_flockfile_start
#undef _newlib_flockfile_exit
#undef _newlib_flockfile_end
#define _newlib_flockfile_start(x) {}
#define _newlib_flockfile_exit(x) {}
#define _newlib_flockfile_end(x) {}
#define _ungetc_r _sungetc_r
#define __srefill_r __ssrefill_r
#define _fread_r _sfread_r
#endif

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

#include "floatio.h"

#define BUF (MAXEXP+MAXFRACT+MB_LEN_MAX+2) /* decimal point + sign + NUL */

/* 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 */
#define	MALLOC 		0x80	/* handle 'm' modifier */

/*
 * 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	NNZDIGITS	0x800	/* no non-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., strtol or strtoul */
#define	CT_FLOAT	4	/* floating, i.e., strtod */

#define u_char unsigned char
#define u_long unsigned long

#ifndef _NO_LONGLONG
typedef unsigned long long u_long_long;
#endif

/*
 * vfscanf
 */

#define BufferEmpty (fp->_r <= 0 && __srefill_r(rptr, fp))

#ifndef STRING_ONLY

#ifndef _REENT_ONLY

int
VFSCANF (register FILE *fp,
       const char *fmt,
       va_list ap)
{
  struct _reent *reent = _REENT;

  CHECK_INIT(reent, fp);
  return __SVFSCANF_R (reent, fp, fmt, ap);
}

int
__SVFSCANF (register FILE *fp,
       char const *fmt0,
       va_list ap)
{
  return __SVFSCANF_R (_REENT, fp, fmt0, ap);
}

#endif /* !_REENT_ONLY */

int
_VFSCANF_R (struct _reent *data,
       register FILE *fp,
       const char *fmt,
       va_list ap)
{
  CHECK_INIT(data, fp);
  return __SVFSCANF_R (data, fp, fmt, ap);
}
#endif /* !STRING_ONLY */

#if defined (STRING_ONLY) && defined (INTEGER_ONLY)
/* When dealing with the sscanf family, we don't want to use the
 * regular ungetc which will drag in file I/O items we don't need.
 * So, we create our own trimmed-down version.  */
int
_sungetc_r (struct _reent *data,
	int c,
	register FILE *fp)
{
  if (c == EOF)
    return (EOF);

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

  /*
   * If we are in the middle of ungetc'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 = c;
      fp->_r++;
      return c;
    }

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

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

  /*
   * 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->_ubuf[sizeof (fp->_ubuf) - 1] = c;
  fp->_p = &fp->_ubuf[sizeof (fp->_ubuf) - 1];
  fp->_r = 1;
  return c;
}

/* String only version of __srefill_r for sscanf family.  */
int
__ssrefill_r (struct _reent * ptr,
       register FILE * fp)
{
  /*
   * Our only hope of further input is the ungetc buffer.
   * If there is anything in that buffer to read, return.
   */
  if (HASUB (fp))
    {
      FREEUB (ptr, fp);
      if ((fp->_r = fp->_ur) != 0)
        {
          fp->_p = fp->_up;
	  return 0;
        }
    }

  /* Otherwise we are out of character input.  */
  fp->_p = fp->_bf._base;
  fp->_r = 0;
  fp->_flags |= __SEOF;
  return EOF;
}

size_t
_sfread_r (struct _reent * ptr,
       void *buf,
       size_t size,
       size_t count,
       FILE * fp)
{
  register size_t resid;
  register char *p;
  register int r;
  size_t total;

  if ((resid = count * size) == 0)
    return 0;

  total = resid;
  p = buf;

  while (resid > (r = fp->_r))
    {
      (void) memcpy ((void *) p, (void *) fp->_p, (size_t) r);
      fp->_p += r;
      fp->_r = 0;
      p += r;
      resid -= r;
      if (__ssrefill_r (ptr, fp))
        {
          /* no more input: return partial result */
          return (total - resid) / size;
        }
    }
  (void) memcpy ((void *) p, (void *) fp->_p, resid);
  fp->_r -= resid;
  fp->_p += resid;
  return count;
}
#else /* !STRING_ONLY || !INTEGER_ONLY */
int _sungetc_r (struct _reent *, int, register FILE *);
int __ssrefill_r (struct _reent *, register FILE *);
size_t _sfread_r (struct _reent *, void *buf, size_t, size_t, FILE *);
#endif /* !STRING_ONLY || !INTEGER_ONLY */

static inline int
__wctob (struct _reent *rptr, wint_t wc)
{
  mbstate_t mbs;
  unsigned char pmb[MB_LEN_MAX];

  if (wc == WEOF)
    return EOF;
  memset (&mbs, '\0', sizeof (mbs));
  return __WCTOMB (rptr, (char *) pmb, wc, &mbs) == 1 ? (int) pmb[0] : 0;
}

int
__SVFSCANF_R (struct _reent *rptr,
       register FILE *fp,
       char const *fmt0,
       va_list ap)
{
  register u_char *fmt = (u_char *) fmt0;
  register int c;		/* character from format, or conversion */
  register size_t width;	/* field width, or 0 */
  register char *p;		/* points into all kinds of strings */
  register int n;		/* handy integer */
  register int flags;		/* flags as defined above */
  register char *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 strtol/strtoul */
  int nbytes = 1;               /* number of bytes read from fmt string */
  wchar_t wc;                   /* wchar to use to read format string */
  wchar_t *wcp;                 /* handy wide character pointer */
  size_t mbslen = 0;            /* length of converted multibyte sequence */
#ifdef _MB_CAPABLE
  mbstate_t state;              /* value to keep track of multibyte state */
#endif
#ifdef _WANT_IO_C99_FORMATS
#define _WANT_IO_POSIX_EXTENSIONS
#endif
#ifdef _WANT_IO_POSIX_EXTENSIONS
  /* POSIX requires that fscanf frees all allocated strings from 'm'
     conversions in case it returns EOF.  m_ptr is used to keep track.
     It will be allocated on the stack the first time an 'm' conversion
     takes place, and it will be free'd on return from the function.
     This implementation tries to save space by only allocating 8
     pointer slots at a time.  Most scenarios should never have to call
     realloc again.  This implementation allows only up to 65528 'm'
     conversions per fscanf invocation for now.  That should be enough
     for almost all scenarios, right? */
  struct m_ptrs {
    void ***m_arr;		/* Array of pointer args to 'm' conversion */
    uint16_t m_siz;		/* Number of slots in m_arr */
    uint16_t m_cnt;		/* Number of valid entries in m_arr */
  } *m_ptr = NULL;
  #define init_m_ptr()							\
    do									\
      {									\
	if (!m_ptr)							\
	  {								\
	    m_ptr = (struct m_ptrs *) alloca (sizeof *m_ptr);		\
	    m_ptr->m_arr = NULL;					\
	    m_ptr->m_siz = 0;						\
	    m_ptr->m_cnt = 0;						\
	  }								\
      }									\
    while (0)
  #define push_m_ptr(arg)						\
    do									\
      {									\
	if (m_ptr->m_cnt >= m_ptr->m_siz)				\
	  {								\
	    void ***n = NULL;						\
									\
	    if (m_ptr->m_siz + 8 > 0 && m_ptr->m_siz + 8 < UINT16_MAX)	\
	      n = (void ***) realloc (m_ptr->m_arr,			\
				      (m_ptr->m_siz + 8) *		\
				      sizeof (void **));		\
	    if (!n)							\
	      {								\
		nassigned = EOF;					\
		goto match_failure;					\
	      }								\
	    m_ptr->m_arr = n;						\
	    m_ptr->m_siz += 8;						\
	  }								\
	m_ptr->m_arr[m_ptr->m_cnt++] = (void **) (arg);				\
      }									\
    while (0)
  #define alloc_m_ptr(_type, _p, _p0, _p_p, _w)				\
    ({									\
      _p_p = GET_ARG (N, ap, _type **);					\
      if (!_p_p)							\
	goto match_failure;						\
      _p0 = (_type *) malloc ((_w) * sizeof (_type));			\
      if (!_p0)								\
	{								\
	  nassigned = EOF;						\
	  goto match_failure;						\
	}								\
      *_p_p = _p0;							\
      push_m_ptr (_p_p);						\
      _p = _p0;								\
      _w;								\
    })
  /* For systems with wchar_t == 2 (UTF-16) check if there's room for
     at least 2 wchar_t's (surrogate pairs). */
  #define realloc_m_ptr(_type, _p, _p0, _p_p, _w)			\
    ({									\
      size_t _nw = (_w);						\
      ptrdiff_t _dif = _p - _p0;					\
      if (_p_p &&							\
	  ((sizeof (_type) == 2 && _dif >= _nw - 1)			\
	   || _dif >= _nw))						\
	{								\
	  _p0 = (_type *) realloc (_p0, (_nw << 1) * sizeof (_type));			\
	  if (!_p0)							\
	    {								\
	      nassigned = EOF;						\
	      goto match_failure;					\
	    }								\
	  _p = _p0 + _dif;						\
	  *_p_p = _p0;							\
	  _nw <<= 1;							\
	}								\
      _nw;								\
    })
  #define shrink_m_ptr(_type, _p_p, _w, _cw)				\
    ({									\
	size_t _nw = (_w);						\
	if (_p_p && _nw < _cw)						\
	  {								\
	    _type *_np_p = (_type *)					\
			   realloc (*_p_p, _nw * sizeof (_type));	\
	    if (_np_p)							\
	      *_p_p = _np_p;						\
	  }								\
    })
  #define free_m_ptr()							\
    do									\
      {									\
	if (m_ptr)							\
	  {								\
	    if (nassigned == EOF)					\
	      {								\
		int i;							\
		for (i = 0; i < m_ptr->m_cnt; ++i)			\
		  {							\
		    free (*m_ptr->m_arr[i]);				\
		    *m_ptr->m_arr[i] = NULL;				\
		  }							\
	      }								\
	    if (m_ptr->m_arr)						\
	      free (m_ptr->m_arr);					\
	  }								\
      }									\
    while (0)
#endif

  #define CCFN_PARAMS	(struct _reent *, const char *, char **, int)
  u_long (*ccfn)CCFN_PARAMS=0;	/* conversion function (strtol/strtoul) */
  char ccltab[256];		/* character class table for %[...] */
  char buf[BUF];		/* buffer for numeric conversions */
  unsigned char *lptr;          /* literal pointer */

  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

  _newlib_flockfile_start (fp);

  ORIENT (fp, -1);

  nassigned = 0;
  nread = 0;
#ifdef _MB_CAPABLE
  memset (&state, 0, sizeof (state));
#endif

  for (;;)
    {
#ifndef _MB_CAPABLE
      wc = *fmt;
#else
      nbytes = __MBTOWC (rptr, &wc, (char *) fmt, MB_CUR_MAX, &state);
      if (nbytes < 0) {
	wc = 0xFFFD; /* Unicode replacement character */
	nbytes = 1;
	memset (&state, 0, sizeof (state));
      }
#endif
      fmt += nbytes;

      if (wc == 0)
	goto all_done;
      if (nbytes == 1 && isspace (wc))
	{
	  for (;;)
	    {
	      if (BufferEmpty || !isspace (*fp->_p))
		break;
	      nread++, fp->_r--, fp->_p++;
	    }
	  continue;
	}
      if (wc != '%')
	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 '%':
	literal:
          lptr = fmt - nbytes;
          for (n = 0; n < nbytes; ++n)
            {
	      if (BufferEmpty)
	        goto input_failure;
	      if (*fp->_p != *lptr)
	        goto match_failure;
	      fp->_r--, fp->_p++;
	      nread++;
              ++lptr;
            }
	  continue;

	case '*':
	  if ((flags & (CHAR | SHORT | LONG | LONGDBL | SUPPRESS | MALLOC))
	      || width)
	    goto match_failure;
	  flags |= SUPPRESS;
	  goto again;
	case 'l':
	  if (flags & (CHAR | SHORT | LONG | LONGDBL))
	    goto match_failure;
#if defined _WANT_IO_C99_FORMATS || !defined _NO_LONGLONG
	  if (*fmt == 'l')	/* Check for 'll' = long long (SUSv3) */
	    {
	      ++fmt;
	      flags |= LONGDBL;
	    }
	  else
#endif
	    flags |= LONG;
	  goto again;
	case 'L':
	  if (flags & (CHAR | SHORT | LONG | LONGDBL))
	    goto match_failure;
	  flags |= LONGDBL;
	  goto again;
	case 'h':
	  if (flags & (CHAR | SHORT | LONG | LONGDBL))
	    goto match_failure;
#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 'j': /* intmax_t */
	  if (flags & (CHAR | SHORT | LONG | LONGDBL))
	    goto match_failure;
	  if (sizeof (intmax_t) == sizeof (long))
	    flags |= LONG;
	  else
	    flags |= LONGDBL;
	  goto again;
	case 't': /* ptrdiff_t */
	  if (flags & (CHAR | SHORT | LONG | LONGDBL))
	    goto match_failure;
	  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 'z': /* size_t */
	  if (flags & (CHAR | SHORT | LONG | LONGDBL))
	    goto match_failure;
	  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 */
#ifdef _WANT_IO_POSIX_EXTENSIONS
	case 'm':
	  if (flags & (CHAR | SHORT | LONG | LONGDBL | MALLOC))
	    goto match_failure;
	  init_m_ptr ();
	  flags |= MALLOC;
	  goto again;
#endif

	case '0':
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
	case '8':
	case '9':
	  if (flags & (CHAR | SHORT | LONG | LONGDBL | MALLOC))
	    goto match_failure;
	  width = width * 10 + c - '0';
	  goto again;

#ifndef _NO_POS_ARGS
	case '$':
	  if (flags & (CHAR | SHORT | LONG | LONGDBL | SUPPRESS | MALLOC))
	    goto match_failure;
	  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 */

	  /*
	   * 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;
	  ccfn = (u_long (*)CCFN_PARAMS)_strtol_r;
	  base = 10;
	  break;

	case 'i':
	  c = CT_INT;
	  ccfn = (u_long (*)CCFN_PARAMS)_strtol_r;
	  base = 0;
	  break;

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

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

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

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

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

	case 's':
	  c = CT_STRING;
	  break;

	case '[':
	  fmt = (u_char *) __sccl (ccltab, (unsigned char *) 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 = _strtoul_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;

	default:
	  goto match_failure;
	}

      /*
       * We have a conversion that requires input.
       */
      if (BufferEmpty)
	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_r (rptr, 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 !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 2
          if (flags & LONG)
            {
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      wchar_t **wcp_p = NULL;
	      wchar_t *wcp0 = NULL;
	      size_t wcp_siz = 0;
#endif
              mbstate_t state;
              if (flags & SUPPRESS)
                wcp = NULL;
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      else if (flags & MALLOC)
		wcp_siz = alloc_m_ptr (wchar_t, wcp, wcp0, wcp_p, 32);
#endif
              else
                wcp = GET_ARG (N, ap, wchar_t *);
              n = 0;
              while (width != 0)
                {
                  if (n == MB_CUR_MAX)
                    goto input_failure;
                  buf[n++] = *fp->_p;
                  fp->_r -= 1;
                  fp->_p += 1;
		  /* Got a high surrogate, allow low surrogate to slip
		     through */
		  if (mbslen != 3 || state.__count != 4)
		    memset (&state, 0, sizeof (mbstate_t));
                  if ((mbslen = _mbrtowc_r (rptr, wcp, buf, n, &state))
                                                         == (size_t)-1)
                    goto input_failure; /* Invalid sequence */
                  if (mbslen == 0 && !(flags & SUPPRESS))
                    *wcp = L'\0';
                  if (mbslen != (size_t)-2) /* Incomplete sequence */
                    {
                      nread += n;
		      /* Handle high surrogate */
		      if (mbslen != 3 || state.__count != 4)
			width -= 1;
                      if (!(flags & SUPPRESS))
			{
#ifdef _WANT_IO_POSIX_EXTENSIONS
			  wcp_siz = realloc_m_ptr (wchar_t, wcp, wcp0, wcp_p,
						   wcp_siz);
#endif
			  wcp++;
			}
                      n = 0;
                    }
                  if (BufferEmpty)
	            {
                      if (n != 0)
                        goto input_failure;
                      break;
                    }
                }
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      shrink_m_ptr (wchar_t, wcp_p, wcp - wcp0, wcp_siz);
#endif
              if (!(flags & SUPPRESS))
                nassigned++;
            }
          else
#endif /* ELIX_LEVEL */
	  if (flags & SUPPRESS)
	    {
	      size_t sum = 0;
	      for (;;)
		{
		  if ((n = fp->_r) < (int)width)
		    {
		      sum += n;
		      width -= n;
		      fp->_p += n;
		      if (__srefill_r (rptr, fp))
			{
			  if (sum == 0)
			    goto input_failure;
			  break;
			}
		    }
		  else
		    {
		      sum += width;
		      fp->_r -= width;
		      fp->_p += width;
		      break;
		    }
		}
	      nread += sum;
	    }
	  else
	    {
	      size_t r;
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      char **p_p = NULL;
	      if (flags & MALLOC)
		alloc_m_ptr (char, p, p0, p_p, width);
	      else
#endif
		p = GET_ARG (N, ap, char *);
	      r = _fread_r (rptr, p, 1, width, fp);
	      if (r == 0)
		goto input_failure;
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      shrink_m_ptr (char, p_p, r, width);
#endif
	      nread += r;
	      nassigned++;
	    }
	  break;

	case CT_CCL:
	  /* scan a (nonempty) character class (sets NOSKIP) */
	  if (width == 0)
	    width = SIZE_MAX;
	  /* take only those things in the class */
#if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 2
	  if (flags & LONG)
	    {
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      wchar_t **wcp_p = NULL;
	      wchar_t *wcp0 = NULL;
	      size_t wcp_siz = 0;
#endif
              mbstate_t state;
              if (flags & SUPPRESS)
                wcp = &wc;
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      else if (flags & MALLOC)
		wcp_siz = alloc_m_ptr (wchar_t, wcp, wcp0, wcp_p, 32);
#endif
              else
		wcp = GET_ARG (N, ap, wchar_t *);
              n = 0;
              while (width != 0) {
                  if (n == MB_CUR_MAX)
                    goto input_failure;
                  buf[n++] = *fp->_p;
                  fp->_r -= 1;
                  fp->_p += 1;
		  /* Got a high surrogate, allow low surrogate to slip
		     through */
		  if (mbslen != 3 || state.__count != 4)
		    memset (&state, 0, sizeof (mbstate_t));
                  if ((mbslen = _mbrtowc_r (rptr, wcp, buf, n, &state))
                                                        == (size_t)-1)
                    goto input_failure;
                  if (mbslen == 0)
                    *wcp = L'\0';
                  if (mbslen != (size_t)-2) /* Incomplete sequence */
                    {
                      if (!ccltab[__wctob (rptr, *wcp)])
                        {
                          while (n != 0)
                            _ungetc_r (rptr, (unsigned char) buf[--n], fp);
                          break;
                        }
                      nread += n;
		      /* Handle high surrogate */
		      if (mbslen != 3 || state.__count != 4)
			width -= 1;
                      if ((flags & SUPPRESS) == 0)
			{
			  wcp += 1;
#ifdef _WANT_IO_POSIX_EXTENSIONS
			  wcp_siz = realloc_m_ptr (wchar_t, wcp, wcp0, wcp_p,
						   wcp_siz);
#endif
			}
                      n = 0;
                    }
                  if (BufferEmpty)
                    {
                      if (n != 0)
                        goto input_failure;
                      break;
                    }
                }
              if (!(flags & SUPPRESS))
                {
                  *wcp = L'\0';
#ifdef _WANT_IO_POSIX_EXTENSIONS
		  shrink_m_ptr (wchar_t, wcp_p, wcp - wcp0 + 1, wcp_siz);
#endif
                  nassigned++;
                }
	    }
	  else
#endif /* ELIX_LEVEL */
	  if (flags & SUPPRESS)
	    {
	      n = 0;
	      while (ccltab[*fp->_p])
		{
		  n++, fp->_r--, fp->_p++;
		  if (--width == 0)
		    break;
		  if (BufferEmpty)
		    {
		      if (n == 0)
			goto input_failure;
		      break;
		    }
		}
	      if (n == 0)
		goto match_failure;
	      nread += n;
	    }
	  else
	    {
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      char **p_p = NULL;
	      size_t p_siz = 0;

	      if (flags & MALLOC)
		p_siz = alloc_m_ptr (char, p, p0, p_p, 32);
	      else
#endif
		p0 = p = GET_ARG (N, ap, char *);
	      while (ccltab[*fp->_p])
		{
		  fp->_r--;
		  *p++ = *fp->_p++;
#ifdef _WANT_IO_POSIX_EXTENSIONS
		  p_siz = realloc_m_ptr (char, p, p0, p_p, p_siz);
#endif
		  if (--width == 0)
		    break;
		  if (BufferEmpty)
		    {
		      if (p == p0)
			goto input_failure;
		      break;
		    }
		}
	      n = p - p0;
	      if (n == 0)
		goto match_failure;
	      *p = 0;
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      shrink_m_ptr (char, p_p, n + 1, p_siz);
#endif
	      nassigned++;
	      nread += n;
	    }
	  break;

	case CT_STRING:
	  /* like CCL, but zero-length string OK, & no NOSKIP */
	  if (width == 0)
	    width = SIZE_MAX;
#if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 2
          if (flags & LONG)
            {
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      wchar_t **wcp_p = NULL;
	      wchar_t *wcp0 = NULL;
	      size_t wcp_siz = 0;
#endif
              /* Process %S and %ls placeholders */
              mbstate_t state;
              if (flags & SUPPRESS)
                wcp = &wc;
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      else if (flags & MALLOC)
		wcp_siz = alloc_m_ptr (wchar_t, wcp, wcp0, wcp_p, 32);
#endif
              else
		wcp = GET_ARG (N, ap, wchar_t *);
              n = 0;
              while (!isspace (*fp->_p) && width != 0)
                {
                  if (n == MB_CUR_MAX)
                    goto input_failure;
                  buf[n++] = *fp->_p;
                  fp->_r -= 1;
                  fp->_p += 1;
		  /* Got a high surrogate, allow low surrogate to slip
		     through */
		  if (mbslen != 3 || state.__count != 4)
		    memset (&state, 0, sizeof (mbstate_t));
                  if ((mbslen = _mbrtowc_r (rptr, wcp, buf, n, &state))
                                                        == (size_t)-1)
                    goto input_failure;
                  if (mbslen == 0)
                    *wcp = L'\0';
                  if (mbslen != (size_t)-2) /* Incomplete sequence */
                    {
                      if (iswspace(*wcp))
                        {
                          while (n != 0)
                            _ungetc_r (rptr, (unsigned char) buf[--n], fp);
                          break;
                        }
                      nread += n;
		      /* Handle high surrogate */
		      if (mbslen != 3 || state.__count != 4)
			width -= 1;
                      if ((flags & SUPPRESS) == 0)
			{
			  wcp += 1;
#ifdef _WANT_IO_POSIX_EXTENSIONS
			  wcp_siz = realloc_m_ptr (wchar_t, wcp, wcp0, wcp_p,
						   wcp_siz);
#endif
			}
                      n = 0;
                    }
                  if (BufferEmpty)
                    {
                      if (n != 0)
                        goto input_failure;
                      break;
                    }
                }
              if (!(flags & SUPPRESS))
                {
                  *wcp = L'\0';
#ifdef _WANT_IO_POSIX_EXTENSIONS
		  shrink_m_ptr (wchar_t, wcp_p, wcp - wcp0 + 1, wcp_siz);
#endif
                  nassigned++;
                }
            }
          else
#endif
	  if (flags & SUPPRESS)
	    {
	      n = 0;
	      while (!isspace (*fp->_p))
		{
		  n++, fp->_r--, fp->_p++;
		  if (--width == 0)
		    break;
		  if (BufferEmpty)
		    break;
		}
	      nread += n;
	    }
	  else
	    {
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      char **p_p = NULL;
	      size_t p_siz = 0;

	      if (flags & MALLOC)
		p_siz = alloc_m_ptr (char, p, p0, p_p, 32);
	      else
#endif
		p0 = GET_ARG (N, ap, char *);
	      p = p0;
	      while (!isspace (*fp->_p))
		{
		  fp->_r--;
		  *p++ = *fp->_p++;
#ifdef _WANT_IO_POSIX_EXTENSIONS
		  p_siz = realloc_m_ptr (char, p, p0, p_p, p_siz);
#endif
		  if (--width == 0)
		    break;
		  if (BufferEmpty)
		    break;
		}
	      *p = 0;
#ifdef _WANT_IO_POSIX_EXTENSIONS
	      shrink_m_ptr (char, p_p, p - p0 + 1, p_siz);
#endif
	      nread += p - p0;
	      nassigned++;
	    }
	  continue;

	case CT_INT:
	{
	  /* scan an integer as if by strtol/strtoul */
	  unsigned width_left = 0;
	  int skips = 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 | NZDIGITS | NNZDIGITS;
	  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 (! (flags & NNZDIGITS))
		    goto ok;
		  if (base == 0)
		    {
		      base = 8;
		      flags |= PFXOK;
		    }
		  if (flags & NZDIGITS)
		    {
		      flags &= ~(SIGNOK | NZDIGITS | NDIGITS);
		      goto ok;
		    }
		  flags &= ~(SIGNOK | PFXOK | NDIGITS);
		  if (width_left)
		    {
		      width_left--;
		      width++;
		    }
		  ++skips;
		  goto skip;

		  /* 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 | NNZDIGITS);
		  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 | NNZDIGITS);
		  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 | NNZDIGITS);
		  goto ok;

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

		  /* x ok iff flag still set & single 0 seen */
		case 'x':
		case 'X':
		  if ((flags & (PFXOK | NZDIGITS)) == PFXOK)
		    {
		      base = 16;/* if %i */
		      flags &= ~PFXOK;
		      /* We must reset the NZDIGITS and NDIGITS
			 flags that would have been unset by seeing
			 the zero that preceded the X or x.  */
		      flags |= NZDIGITS | NDIGITS;
		      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;
	    skip:
	      if (--fp->_r > 0)
		fp->_p++;
	      else
	      if (__srefill_r (rptr, 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'.
	   * 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)
		_ungetc_r (rptr, *--p, fp); /* [-+xX] */
	      if (p == buf)
		goto match_failure;
	    }
	  if ((flags & SUPPRESS) == 0)
	    {
	      u_long res;

	      *p = 0;
	      res = (*ccfn) (rptr, buf, (char **) NULL, base);
	      if (flags & POINTER)
		{
		  void **vp = GET_ARG (N, ap, void **);
#ifndef _NO_LONGLONG
		  if (sizeof (uintptr_t) > sizeof (u_long))
		    {
		      u_long_long resll;
		      resll = _strtoull_r (rptr, buf, (char **) 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)
		{
		  u_long_long resll;
		  if (ccfn == _strtoul_r)
		    resll = _strtoull_r (rptr, buf, (char **) NULL, base);
		  else
		    resll = _strtoll_r (rptr, buf, (char **) 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 + skips;
	  break;
	}
#ifdef FLOATING_POINT
	case CT_FLOAT:
	{
	  /* scan a floating point number as if by strtod */
	  /* 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;
	  char *exp_start = NULL;
	  unsigned width_left = 0;
	  char nancount = 0;
	  char infcount = 0;
	  const char *decpt = _localeconv_r (rptr)->decimal_point;
#ifdef _MB_CAPABLE
	  int decptpos = 0;
#endif
#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 = *fp->_p;
	      /*
	       * This code mimicks the integer conversion
	       * code, but is much simpler.
	       */
	      switch (c)
		{
		case '0':
		  if (flags & NDIGITS)
		    {
		      flags &= ~SIGNOK;
		      zeroes++;
		      if (width_left)
			{
			  width_left--;
			  width++;
			}
		      goto fskip;
		    }
		  /* Fall through.  */
		case '1':
		case '2':
		case '3':
		case '4':
		case '5':
		case '6':
		case '7':
		case '8':
		case '9':
		  if (nancount + infcount == 0)
		    {
		      flags &= ~(SIGNOK | NDIGITS);
		      goto fok;
		    }
		  break;

		case '+':
		case '-':
		  if (flags & SIGNOK)
		    {
		      flags &= ~SIGNOK;
		      goto fok;
		    }
		  break;
		case 'n':
		case '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 'a':
		case 'A':
		  if (nancount == 1)
		    {
		      nancount = 2;
		      goto fok;
		    }
		  break;
		case 'i':
		case '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 'f':
		case 'F':
		  if (infcount == 2)
		    {
		      infcount = 3;
		      goto fok;
		    }
		  break;
		case 't':
		case 'T':
		  if (infcount == 6)
		    {
		      infcount = 7;
		      goto fok;
		    }
		  break;
		case 'y':
		case 'Y':
		  if (infcount == 7)
		    {
		      infcount = 8;
		      goto fok;
		    }
		  break;
		case 'e':
		case '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;
		default:
#ifndef _MB_CAPABLE
		  if ((unsigned char) c == (unsigned char) decpt[0]
		      && (flags & DPTOK))
		    {
		      flags &= ~(SIGNOK | DPTOK);
		      leading_zeroes = zeroes;
		      goto fok;
		    }
		  break;
#else
		  if (flags & DPTOK)
		    {
		      while ((unsigned char) c
			     == (unsigned char) decpt[decptpos])
			{
			  if (decpt[++decptpos] == '\0')
			    {
			      /* We read the complete decpt seq. */
			      flags &= ~(SIGNOK | DPTOK);
			      leading_zeroes = zeroes;
			      p = stpncpy (p, decpt, decptpos);
			      decptpos = 0;
			      goto fskip;
			    }
			  ++nread;
			  if (--fp->_r > 0)
			    fp->_p++;
			  else if (__srefill_r (rptr, fp))
			    break;		/* EOF */
			  c = *fp->_p;
			}
		      if (decptpos > 0)
			{
			  /* We read part of a multibyte decimal point,
			     but the rest is invalid or we're at EOF,
			     so back off. */
			  while (decptpos-- > 0)
			    {
			      _ungetc_r (rptr, (unsigned char) decpt[decptpos],
					 fp);
			      --nread;
			    }
			}
		    }
		  break;
#endif
		}
	      break;
	    fok:
	      *p++ = c;
	    fskip:
	      width--;
	      ++nread;
	      if (--fp->_r > 0)
		fp->_p++;
	      else
	      if (__srefill_r (rptr, fp))
		break;		/* EOF */
	    }
	  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)
		{
		  _ungetc_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)
		  {
		    _ungetc_r (rptr, *--p, fp); /* [iInNtT] */
		    --nread;
		  }
	      else
		{
		  while (p > buf)
		    {
		      _ungetc_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)
		    {
		      _ungetc_r (rptr, *--p, fp); /* [-+.] */
		      --nread;
		    }
		  goto match_failure;
		}
	      /* just a bad exponent (e and maybe sign) */
	      c = *--p;
	      --nread;
	      if (c != 'e' && c != 'E')
		{
		  _ungetc_r (rptr, c, fp); /* [-+] */
		  c = *--p;
		  --nread;
		}
	      _ungetc_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 = _strtol_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;
                 sprintf (exp_start, "e%ld", new_exp);
		}

	      /* FIXME: Is that still true?
	         Current _strtold routine is markedly slower than
	         _strtod_r.  Only use it if we have a long double
	         result.  */
#ifndef _NO_LONGDBL /* !_NO_LONGDBL */
	      if (flags & LONGDBL)
		qres = _strtold_r (rptr, buf, NULL);
	      else
#endif
	        res = _strtod_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 ("");
		  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.  */
  nassigned = nassigned && !(fp->_flags & __SERR) ? nassigned : EOF;
match_failure:
all_done:
  /* Return number of matches, which can be 0 on match failure.  */
  _newlib_flockfile_end (fp);
#ifdef _WANT_IO_POSIX_EXTENSIONS
  free_m_ptr ();
#endif
  return nassigned;
}

#ifndef _NO_POS_ARGS
/* Process all intermediate arguments.  Fortunately, with scanf, 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 */