glibc/stdio-common/vfscanf.c

/* Copyright (C) 1991-1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
#include <bits/libc-lock.h>
#include <locale/localeinfo.h>

#ifdef	__GNUC__
# define HAVE_LONGLONG
# define LONGLONG	long long
#else
# define LONGLONG	long
#endif

/* Determine whether we have to handle `long long' at all.  */
#if LONG_MAX == LONG_LONG_MAX
# define need_longlong	0
#else
# define need_longlong	1
#endif

/* Determine whether we have to handle `long'.  */
#if INT_MAX == LONG_MAX
# define need_long	0
#else
# define need_long 	1
#endif

/* Those are flags in the conversion format. */
#define LONG		0x001	/* l: long or double */
#define LONGDBL		0x002	/* L: long long or long double */
#define SHORT		0x004	/* h: short */
#define SUPPRESS	0x008	/* *: suppress assignment */
#define POINTER		0x010	/* weird %p pointer (`fake hex') */
#define NOSKIP		0x020	/* do not skip blanks */
#define WIDTH		0x040	/* width was given */
#define GROUP		0x080	/* ': group numbers */
#define MALLOC		0x100	/* a: malloc strings */
#define CHAR		0x200	/* hh: char */
#define I18N		0x400	/* I: use locale's digits */


#ifdef USE_IN_LIBIO
# include <libioP.h>
# include <libio.h>

# undef va_list
# define va_list	_IO_va_list

# ifdef COMPILE_WPRINTF
#  define ungetc(c, s)	((void) (c == WEOF				      \
				 || (--read_in,				      \
				     _IO_sputbackwc (s, c))))
#  define inchar()	(c == WEOF ? WEOF				      \
			 : ((c = _IO_getwc_unlocked (s)),		      \
			    (void) (c != WEOF && ++read_in), c))

#  define MEMCPY(d, s, n) wmemcpy (d, s, n)
#  define ISSPACE(Ch)	  iswspace (Ch)
#  define ISDIGIT(Ch)	  iswdigit (Ch)
#  define ISXDIGIT(Ch)	  iswxdigit (Ch)
#  define TOLOWER(Ch)	  towlower (Ch)
#  define ORIENT	  if (s->_vtable_offset == 0 && _IO_fwide (s, 1) != 1)\
			    return EOF
#  define __strtoll_internal	__wcstoll_internal
#  define __strtoull_internal	__wcstoull_internal
#  define __strtol_internal	__wcstol_internal
#  define __strtoul_internal	__wcstoul_internal
#  define __strtold_internal	__wcstold_internal
#  define __strtod_internal	__wcstod_internal
#  define __strtof_internal	__wcstof_internal

#  define L_(Str)	  L##Str
#  define CHAR_T	  wchar_t
#  define UCHAR_T	  unsigned int
#  define WINT_T	  wint_t
# else
#  define ungetc(c, s)	((void) ((int) c == EOF				      \
				 || (--read_in,				      \
				     _IO_sputbackc (s, (unsigned char) c))))
#  define inchar()	(c == EOF ? EOF					      \
			 : ((c = _IO_getc_unlocked (s)),		      \
			    (void) (c != EOF && ++read_in), c))
#  define MEMCPY(d, s, n) memcpy (d, s, n)
#  define ISSPACE(Ch)	  isspace (Ch)
#  define ISDIGIT(Ch)	  isdigit (Ch)
#  define ISXDIGIT(Ch)	  isxdigit (Ch)
#  define TOLOWER(Ch)	  tolower (Ch)
#  define ORIENT	  if (_IO_fwide (s, -1) != -1) return EOF

#  define L_(Str)	  Str
#  define CHAR_T	  char
#  define UCHAR_T	  unsigned char
#  define WINT_T	  int
# endif

# define encode_error() do {						      \
			  if (errp != NULL) *errp |= 4;			      \
			  _IO_funlockfile (s);				      \
			  __libc_cleanup_end (0);			      \
			  __set_errno (EILSEQ);				      \
			  return done;					      \
			} while (0)
# define conv_error()	do {						      \
			  if (errp != NULL) *errp |= 2;			      \
			  _IO_funlockfile (s);				      \
			  __libc_cleanup_end (0);			      \
			  return done;					      \
			} while (0)
# define input_error()	do {						      \
			  _IO_funlockfile (s);				      \
			  if (errp != NULL) *errp |= 1;			      \
			  __libc_cleanup_end (0);			      \
			  return done ?: EOF;				      \
			} while (0)
# define memory_error() do {						      \
			  _IO_funlockfile (s);				      \
			  __set_errno (ENOMEM);				      \
			  __libc_cleanup_end (0);			      \
			  return EOF;					      \
			} while (0)
# define ARGCHECK(s, format)						      \
  do									      \
    {									      \
      /* Check file argument for consistence.  */			      \
      CHECK_FILE (s, EOF);						      \
      if (s->_flags & _IO_NO_READS)					      \
	{								      \
	  __set_errno (EBADF);						      \
	  return EOF;							      \
	}								      \
      else if (format == NULL)						      \
	{								      \
	  MAYBE_SET_EINVAL;						      \
	  return EOF;							      \
	}								      \
    } while (0)
# define LOCK_STREAM(S)							      \
  __libc_cleanup_region_start ((void (*) (void *)) &_IO_funlockfile, (S));    \
  _IO_flockfile (S)
# define UNLOCK_STREAM(S)						      \
  _IO_funlockfile (S);							      \
  __libc_cleanup_region_end (0)
#else
# define ungetc(c, s)	((void) (c != EOF && --read_in), ungetc (c, s))
# define inchar()	(c == EOF ? EOF					      \
			 : ((c = getc (s)), (void) (c != EOF && ++read_in), c))
# define MEMCPY(d, s, n)  memcpy (d, s, n)
# define ISSPACE(Ch)      isspace (Ch)
# define ISDIGIT(Ch)      isdigit (Ch)
# define ISXDIGIT(Ch)     isxdigit (Ch)
# define TOLOWER(Ch)      tolower (Ch)

# define L_(Str)          Str
# define CHAR_T           char
# define UCHAR_T          unsigned char
# define WINT_T           int

# define encode_error()	do {						      \
			  funlockfile (s);				      \
			  __set_errno (EILSEQ);				      \
			  return done;					      \
			} while (0)
# define conv_error()	do {						      \
			  funlockfile (s);				      \
			  return done;					      \
			} while (0)
# define input_error()	do {						      \
			  funlockfile (s);				      \
			  return done ?: EOF;				      \
			} while (0)
# define memory_error()	do {						      \
			  funlockfile (s);				      \
			  __set_errno (ENOMEM);				      \
			  return EOF;					      \
			} while (0)
# define ARGCHECK(s, format)						      \
  do									      \
    {									      \
      /* Check file argument for consistence.  */			      \
      if (!__validfp (s) || !s->__mode.__read)				      \
	{								      \
	  __set_errno (EBADF);						      \
	  return EOF;							      \
	}								      \
      else if (format == NULL)						      \
	{								      \
	  __set_errno (EINVAL);						      \
	  return EOF;							      \
	}								      \
    } while (0)
#if 1
      /* XXX For now !!! */
# define flockfile(S) /* nothing */
# define funlockfile(S) /* nothing */
# define LOCK_STREAM(S)
# define UNLOCK_STREAM(S)
#else
# define LOCK_STREAM(S)							      \
  __libc_cleanup_region_start (&__funlockfile, (S));			      \
  __flockfile (S)
# define UNLOCK_STREAM(S)						      \
  __funlockfile (S);							      \
  __libc_cleanup_region_end (0)
#endif
#endif


/* Read formatted input from S according to the format string
   FORMAT, using the argument list in ARG.
   Return the number of assignments made, or -1 for an input error.  */
#ifdef USE_IN_LIBIO
# ifdef COMPILE_WPRINTF
int
_IO_vfwscanf (s, format, argptr, errp)
     _IO_FILE *s;
     const wchar_t *format;
     _IO_va_list argptr;
     int *errp;
# else
int
_IO_vfscanf (s, format, argptr, errp)
     _IO_FILE *s;
     const char *format;
     _IO_va_list argptr;
     int *errp;
# endif
#else
int
__vfscanf (FILE *s, const char *format, va_list argptr)
#endif
{
  va_list arg;
  register const CHAR_T *f = format;
  register UCHAR_T fc;	/* Current character of the format.  */
  register size_t done = 0;	/* Assignments done.  */
  register size_t read_in = 0;	/* Chars read in.  */
  register WINT_T c = 0;	/* Last char read.  */
  register int width;		/* Maximum field width.  */
  register int flags;		/* Modifiers for current format element.  */

  /* Status for reading F-P nums.  */
  char got_dot, got_e, negative;
  /* If a [...] is a [^...].  */
  CHAR_T not_in;
#define exp_char not_in
  /* Base for integral numbers.  */
  int base;
  /* Signedness for integral numbers.  */
  int number_signed;
#define is_hexa number_signed
  /* Decimal point character.  */
  wchar_t decimal;
  /* The thousands character of the current locale.  */
  wchar_t thousands;
  /* State for the conversions.  */
  mbstate_t state;
  /* Integral holding variables.  */
  union
    {
      long long int q;
      unsigned long long int uq;
      long int l;
      unsigned long int ul;
    } num;
  /* Character-buffer pointer.  */
  char *str = NULL;
  wchar_t *wstr = NULL;
  char **strptr = NULL;
  size_t strsize = 0;
  /* We must not react on white spaces immediately because they can
     possibly be matched even if in the input stream no character is
     available anymore.  */
  int skip_space = 0;
  /* Nonzero if we are reading a pointer.  */
  int read_pointer;
  /* Workspace.  */
  CHAR_T *tw;			/* Temporary pointer.  */
  CHAR_T *wp = NULL;		/* Workspace.  */
  size_t wpmax = 0;		/* Maximal size of workspace.  */
  size_t wpsize;		/* Currently used bytes in workspace.  */
#define ADDW(Ch)							    \
  do									    \
    {									    \
      if (wpsize == wpmax)						    \
	{								    \
	  CHAR_T *old = wp;						    \
	  wpmax = UCHAR_MAX > 2 * wpmax ? UCHAR_MAX : 2 * wpmax;	    \
	  wp = (CHAR_T *) alloca (wpmax * sizeof (wchar_t));		    \
	  if (old != NULL)						    \
	    MEMCPY (wp, old, wpsize);					    \
	}								    \
      wp[wpsize++] = (Ch);						    \
    }									    \
  while (0)

#ifdef __va_copy
  __va_copy (arg, argptr);
#else
  arg = (va_list) argptr;
#endif

#ifdef ORIENT
  ORIENT;
#endif

  ARGCHECK (s, format);

  /* Figure out the decimal point character.  */
  memset (&state, '\0', sizeof (state));
  if (__mbrtowc (&decimal, _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT),
		 strlen (_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT)), &state)
      <= 0)
    decimal = (wchar_t) *_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT);
  /* Figure out the thousands separator character.  */
  memset (&state, '\0', sizeof (state));
  if (__mbrtowc (&thousands, _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP),
		 strlen (_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP)),
		 &state) <= 0)
    thousands = (wchar_t) *_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);

  /* Lock the stream.  */
  LOCK_STREAM (s);


#ifndef COMPILE_WPRINTF
  /* From now on we use `state' to convert the format string.  */
  memset (&state, '\0', sizeof (state));
#endif

  /* Run through the format string.  */
  while (*f != '\0')
    {
      unsigned int argpos;
      /* Extract the next argument, which is of type TYPE.
	 For a %N$... spec, this is the Nth argument from the beginning;
	 otherwise it is the next argument after the state now in ARG.  */
#ifdef __va_copy
# define ARG(type)	(argpos == 0 ? va_arg (arg, type) :		      \
			 ({ unsigned int pos = argpos;			      \
			    va_list arg;				      \
			    __va_copy (arg, argptr);			      \
			    while (--pos > 0)				      \
			      (void) va_arg (arg, void *);		      \
			    va_arg (arg, type);				      \
			  }))
#else
# if 0
      /* XXX Possible optimization.  */
#  define ARG(type)	(argpos == 0 ? va_arg (arg, type) :		      \
			 ({ va_list arg = (va_list) argptr;		      \
			    arg = (va_list) ((char *) arg		      \
					     + (argpos - 1)		      \
					     * __va_rounded_size (void *));   \
			    va_arg (arg, type);				      \
			 }))
# else
#  define ARG(type)	(argpos == 0 ? va_arg (arg, type) :		      \
			 ({ unsigned int pos = argpos;			      \
			    va_list arg = (va_list) argptr;		      \
			    while (--pos > 0)				      \
			      (void) va_arg (arg, void *);		      \
			    va_arg (arg, type);				      \
			  }))
# endif
#endif

#ifndef COMPILE_WPRINTF
      if (!isascii (*f))
	{
	  /* Non-ASCII, may be a multibyte.  */
	  int len = __mbrlen (f, strlen (f), &state);
	  if (len > 0)
	    {
	      do
		{
		  c = inchar ();
		  if (c == EOF)
		    input_error ();
		  else if (c != *f++)
		    {
		      ungetc (c, s);
		      conv_error ();
		    }
		}
	      while (--len > 0);
	      continue;
	    }
	}
#endif

      fc = *f++;
      if (fc != '%')
	{
	  /* Remember to skip spaces.  */
	  if (ISSPACE (fc))
	    {
	      skip_space = 1;
	      continue;
	    }

	  /* Read a character.  */
	  c = inchar ();

	  /* Characters other than format specs must just match.  */
	  if (c == EOF)
	    input_error ();

	  /* We saw white space char as the last character in the format
	     string.  Now it's time to skip all leading white space.  */
	  if (skip_space)
	    {
	      while (ISSPACE (c))
		if (inchar () == EOF && errno == EINTR)
		  conv_error ();
	      skip_space = 0;
	    }

	  if (c != fc)
	    {
	      ungetc (c, s);
	      conv_error ();
	    }

	  continue;
	}

      /* This is the start of the conversion string. */
      flags = 0;

      /* Not yet decided whether we read a pointer or not.  */
      read_pointer = 0;

      /* Initialize state of modifiers.  */
      argpos = 0;

      /* Prepare temporary buffer.  */
      wpsize = 0;

      /* Check for a positional parameter specification.  */
      if (ISDIGIT (*f))
	{
	  argpos = *f++ - L_('0');
	  while (ISDIGIT (*f))
	    argpos = argpos * 10 + (*f++ - L_('0'));
	  if (*f == L_('$'))
	    ++f;
	  else
	    {
	      /* Oops; that was actually the field width.  */
	      width = argpos;
	      flags |= WIDTH;
	      argpos = 0;
	      goto got_width;
	    }
	}

      /* Check for the assignment-suppressing, the number grouping flag,
	 and the signal to use the locale's digit representation.  */
      while (*f == L_('*') || *f == L_('\'') || *f == L_('I'))
	switch (*f++)
	  {
	  case L_('*'):
	    flags |= SUPPRESS;
	    break;
	  case L_('\''):
	    flags |= GROUP;
	    break;
	  case L_('I'):
	    flags |= I18N;
	    break;
	  }

      /* We have seen width. */
      if (ISDIGIT (*f))
	flags |= WIDTH;

      /* Find the maximum field width.  */
      width = 0;
      while (ISDIGIT (*f))
	{
	  width *= 10;
	  width += *f++ - L_('0');
	}
    got_width:
      if (width == 0)
	width = -1;

      /* Check for type modifiers.  */
      switch (*f++)
	{
	case L_('h'):
	  /* ints are short ints or chars.  */
	  if (*f == L_('h'))
	    {
	      ++f;
	      flags |= CHAR;
	    }
	  else
	    flags |= SHORT;
	  break;
	case L_('l'):
	  if (*f == L_('l'))
	    {
	      /* A double `l' is equivalent to an `L'.  */
	      ++f;
	      flags |= LONGDBL | LONG;
	    }
	  else
	    /* ints are long ints.  */
	    flags |= LONG;
	  break;
	case L_('q'):
	case L_('L'):
	  /* doubles are long doubles, and ints are long long ints.  */
	  flags |= LONGDBL | LONG;
	  break;
	case L_('a'):
	  /* The `a' is used as a flag only if followed by `s', `S' or
	     `['.  */
	  if (*f != L_('s') && *f != L_('S') && *f != L_('['))
	    {
	      --f;
	      break;
	    }
	  /* String conversions (%s, %[) take a `char **'
	     arg and fill it in with a malloc'd pointer.  */
	  flags |= MALLOC;
	  break;
	case L_('z'):
	  if (need_longlong && sizeof (size_t) > sizeof (unsigned long int))
	    flags |= LONGDBL;
	  else if (sizeof (size_t) > sizeof (unsigned int))
	    flags |= LONG;
	  break;
	case L_('j'):
	  if (need_longlong && sizeof (uintmax_t) > sizeof (unsigned long int))
	    flags |= LONGDBL;
	  else if (sizeof (uintmax_t) > sizeof (unsigned int))
	    flags |= LONG;
	  break;
	case L_('t'):
	  if (need_longlong && sizeof (ptrdiff_t) > sizeof (long int))
	    flags |= LONGDBL;
	  else if (sizeof (ptrdiff_t) > sizeof (int))
	    flags |= LONG;
	  break;
	default:
	  /* Not a recognized modifier.  Backup.  */
	  --f;
	  break;
	}

      /* End of the format string?  */
      if (*f == L_('\0'))
	conv_error ();

      /* Find the conversion specifier.  */
      fc = *f++;
      if (skip_space || (fc != L_('[') && fc != L_('c')
			 && fc != L_('C') && fc != L_('n')))
	{
	  /* Eat whitespace.  */
	  int save_errno = errno;
	  errno = 0;
	  do
	    if (inchar () == EOF && errno == EINTR)
	      input_error ();
	  while (ISSPACE (c));
	  errno = save_errno;
	  ungetc (c, s);
	  skip_space = 0;
	}

      switch (fc)
	{
	case L_('%'):	/* Must match a literal '%'.  */
	  c = inchar ();
	  if (c == EOF)
	    input_error ();
	  if (c != fc)
	    {
	      ungetc (c, s);
	      conv_error ();
	    }
	  break;

	case L_('n'):	/* Answer number of assignments done.  */
	  /* Corrigendum 1 to ISO C 1990 describes the allowed flags
	     with the 'n' conversion specifier.  */
	  if (!(flags & SUPPRESS))
	    {
	      /* Don't count the read-ahead.  */
	      if (need_longlong && (flags & LONGDBL))
		*ARG (long long int *) = read_in;
	      else if (need_long && (flags & LONG))
		*ARG (long int *) = read_in;
	      else if (flags & SHORT)
		*ARG (short int *) = read_in;
	      else if (!(flags & CHAR))
		*ARG (int *) = read_in;
	      else
		*ARG (char *) = read_in;

#ifdef NO_BUG_IN_ISO_C_CORRIGENDUM_1
	      /* We have a severe problem here.  The ISO C standard
		 contradicts itself in explaining the effect of the %n
		 format in `scanf'.  While in ISO C:1990 and the ISO C
		 Amendement 1:1995 the result is described as

		   Execution of a %n directive does not effect the
		   assignment count returned at the completion of
		   execution of the f(w)scanf function.

		 in ISO C Corrigendum 1:1994 the following was added:

		   Subclause 7.9.6.2
		   Add the following fourth example:
		     In:
		       #include <stdio.h>
		       int d1, d2, n1, n2, i;
		       i = sscanf("123", "%d%n%n%d", &d1, &n1, &n2, &d2);
		     the value 123 is assigned to d1 and the value3 to n1.
		     Because %n can never get an input failure the value
		     of 3 is also assigned to n2.  The value of d2 is not
		     affected.  The value 3 is assigned to i.

		 We go for now with the historically correct code from ISO C,
		 i.e., we don't count the %n assignments.  When it ever
		 should proof to be wrong just remove the #ifdef above.  */
	      ++done;
#endif
	    }
	  break;

	case L_('c'):	/* Match characters.  */
	  if ((flags & LONG) == 0)
	    {
	      if (!(flags & SUPPRESS))
		{
		  str = ARG (char *);
		  if (str == NULL)
		    conv_error ();
		}

	      c = inchar ();
	      if (c == EOF)
		input_error ();

	      if (width == -1)
		width = 1;

#ifdef COMPILE_WPRINTF
	      /* We have to convert the wide character(s) into multibyte
		 characters and store the result.  */
	      memset (&state, '\0', sizeof (state));

	      do
		{
		  size_t n;

		  n = wcrtomb (!(flags & SUPPRESS) ? str : NULL, c, &state);
		  if (n == (size_t) -1)
		    /* No valid wide character.  */
		    input_error ();

		  /* Increment the output pointer.  Even if we don't
		     write anything.  */
		  str += n;
		}
	      while (--width > 0 && inchar () != EOF);
#else
	      if (!(flags & SUPPRESS))
		{
		  do
		    *str++ = c;
		  while (--width > 0 && inchar () != EOF);
		}
	      else
		while (--width > 0 && inchar () != EOF);
#endif

	      if (!(flags & SUPPRESS))
		++done;

	      break;
	    }
	  /* FALLTHROUGH */
	case L_('C'):
	  if (!(flags & SUPPRESS))
	    {
	      wstr = ARG (wchar_t *);
	      if (str == NULL)
		conv_error ();
	    }

	  c = inchar ();
	  if (c == EOF)
	    input_error ();

#ifdef COMPILE_WPRINTF
	  /* Just store the incoming wide characters.  */
	  if (!(flags & SUPPRESS))
	    {
	      do
		*wstr++ = c;
	      while (--width > 0 && inchar () != EOF);
	    }
	  else
	    while (--width > 0 && inchar () != EOF);
#else
	  {
	    /* We have to convert the multibyte input sequence to wide
	       characters.  */
	    char buf[MB_LEN_MAX];
	    mbstate_t cstate;

	    memset (&cstate, '\0', sizeof (cstate));

	    do
	      {
		size_t cnt;

		/* This is what we present the mbrtowc function first.  */
		buf[0] = c;
		cnt = 1;

		while (1)
		  {
		    size_t n;

		    n = __mbrtowc (!(flags & SUPPRESS) ? wstr : NULL,
				   buf, cnt, &cstate);

		    if (n == (size_t) -2)
		      {
			/* Possibly correct character, just not enough
			   input.  */
			assert (cnt < MB_CUR_MAX);

			if (inchar () == EOF)
			  encode_error ();

			buf[cnt++] = c;
			continue;
		      }

		    if (n != cnt)
		      encode_error ();

		    /* We have a match.  */
		    break;
		  }

		/* Advance the result pointer.  */
		++wstr;
	      }
	    while (--width > 0 && inchar () != EOF);
	  }
#endif

	  if (!(flags & SUPPRESS))
	    ++done;

	  break;

	case L_('s'):		/* Read a string.  */
	  if (!(flags & LONG))
	    {
#define STRING_ARG(Str, Type)						      \
	      do if (!(flags & SUPPRESS))				      \
		{							      \
		  if (flags & MALLOC)					      \
		    {							      \
		      /* The string is to be stored in a malloc'd buffer.  */ \
		      strptr = ARG (char **);				      \
		      if (strptr == NULL)				      \
			conv_error ();					      \
		      /* Allocate an initial buffer.  */		      \
		      strsize = 100;					      \
		      *strptr = (char *) malloc (strsize * sizeof (Type));    \
		      Str = (Type *) *strptr;				      \
		    }							      \
		  else							      \
		    Str = ARG (Type *);					      \
		  if (Str == NULL)					      \
		    conv_error ();					      \
		} while (0)
	      STRING_ARG (str, char);

	      c = inchar ();
	      if (c == EOF)
		input_error ();

#ifdef COMPILE_WPRINTF
	      memset (&state, '\0', sizeof (state));
#endif

	      do
		{
		  if (ISSPACE (c))
		    {
		      ungetc (c, s);
		      break;
		    }

#ifdef COMPILE_WPRINTF
		  /* This is quite complicated.  We have to convert the
		     wide characters into multibyte characters and then
		     store them.  */
		  {
		    size_t n;

		    if (!(flags & SUPPRESS) && (flags & MALLOC)
			&& str + MB_CUR_MAX >= *strptr + strsize)
		      {
			/* We have to enlarge the buffer if the `a' flag
			   was given.  */
			str = (char *) realloc (*strptr, strsize * 2);
			if (str == NULL)
			  {
			    /* Can't allocate that much.  Last-ditch
			       effort.  */
			    str = (char *) realloc (*strptr, strsize + 1);
			    if (str == NULL)
			      {
				/* We lose.  Oh well.  Terminate the
				   string and stop converting,
				   so at least we don't skip any input.  */
				((char *) (*strptr))[strsize - 1] = '\0';
				++done;
				conv_error ();
			      }
			    else
			      {
				*strptr = (char *) str;
				str += strsize;
				++strsize;
			      }
			  }
			else
			  {
			    *strptr = (char *) str;
			    str += strsize;
			    strsize *= 2;
			  }
		      }

		    n = wcrtomb (!(flags & SUPPRESS) ? str : NULL, c, &state);
		    if (n == (size_t) -1)
		      encode_error ();

		    assert (n <= MB_CUR_MAX);
		    str += n;
		  }
#else
		  /* This is easy.  */
		  if (!(flags & SUPPRESS))
		    {
		      *str++ = c;
		      if ((flags & MALLOC)
			  && (char *) str == *strptr + strsize)
			{
			  /* Enlarge the buffer.  */
			  str = (char *) realloc (*strptr, 2 * strsize);
			  if (str == NULL)
			    {
			      /* Can't allocate that much.  Last-ditch
				 effort.  */
			      str = (char *) realloc (*strptr, strsize + 1);
			      if (str == NULL)
				{
				  /* We lose.  Oh well.  Terminate the
				     string and stop converting,
				     so at least we don't skip any input.  */
				  ((char *) (*strptr))[strsize - 1] = '\0';
				  ++done;
				  conv_error ();
				}
			      else
				{
				  *strptr = (char *) str;
				  str += strsize;
				  ++strsize;
				}
			    }
			  else
			    {
			      *strptr = (char *) str;
			      str += strsize;
			      strsize *= 2;
			    }
			}
		    }
#endif
		}
	      while ((width <= 0 || --width > 0) && inchar () != EOF);

	      if (!(flags & SUPPRESS))
		{
#ifdef COMPILE_WPRINTF
		  /* We have to emit the code to get into the intial
		     state.  */
		  char buf[MB_LEN_MAX];
		  size_t n = wcrtomb (buf, L'\0', &state);
		  if (n > 0 && (flags & MALLOC)
		      && str + n >= *strptr + strsize)
		    {
		      /* Enlarge the buffer.  */
		      str = (char *) realloc (*strptr,
					      (str + n + 1) - *strptr);
		      if (str == NULL)
			{
			  /* We lose.  Oh well.  Terminate the string
			     and stop converting, so at least we don't
			     skip any input.  */
			  ((char *) (*strptr))[strsize - 1] = '\0';
			  ++done;
			  conv_error ();
			}
		      else
			{
			  *strptr = (char *) str;
			  str = ((char *) *strptr) + strsize;
			  strsize = (str + n + 1) - *strptr;
			}
		    }

		  str = __mempcpy (str, buf, n);
#endif
		  *str = '\0';

		  if ((flags & MALLOC) && str - *strptr != strsize)
		    {
		      char *cp = (char *) realloc (*strptr, str - *strptr);
		      if (cp != NULL)
			*strptr = cp;
		    }

		  ++done;
		}
	      break;
	    }
	  /* FALLTHROUGH */

	case L_('S'):
	  {
#ifndef COMPILE_WPRINTF
	    mbstate_t cstate;
#endif

	    /* Wide character string.  */
	    STRING_ARG (wstr, wchar_t);

	    c = inchar ();
	    if (c == EOF)
	      input_error ();

#ifndef COMPILE_WPRINTF
	    memset (&cstate, '\0', sizeof (cstate));
#endif

	    do
	      {
		if (ISSPACE (c))
		  {
		    ungetc (c, s);
		    break;
		  }

#ifdef COMPILE_WPRINTF
		/* This is easy.  */
		if (!(flags & SUPPRESS))
		  {
		    *wstr++ = c;
		    if ((flags & MALLOC)
			&& wstr == (wchar_t *) *strptr + strsize)
		      {
			/* Enlarge the buffer.  */
			wstr = (wchar_t *) realloc (*strptr,
						    (2 * strsize)
						    * sizeof (wchar_t));
			if (wstr == NULL)
			  {
			    /* Can't allocate that much.  Last-ditch
                               effort.  */
			    wstr = (wchar_t *) realloc (*strptr,
							(strsize
							 + sizeof (wchar_t)));
			    if (wstr == NULL)
			      {
				/* We lose.  Oh well.  Terminate the string
				   and stop converting, so at least we don't
				   skip any input.  */
				((wchar_t *) (*strptr))[strsize - 1] = L'\0';
				++done;
				conv_error ();
			      }
			    else
			      {
				*strptr = (char *) wstr;
				wstr += strsize;
				++strsize;
			      }
			  }
			else
			  {
			    *strptr = (char *) wstr;
			    wstr += strsize;
			    strsize *= 2;
			  }
		      }
		  }
#else
		{
		  char buf[MB_LEN_MAX];
		  size_t cnt;

		  buf[0] = c;
		  cnt = 1;

		  while (1)
		    {
		      size_t n;

		      n = __mbrtowc (!(flags & SUPPRESS) ? wstr : NULL,
				     buf, cnt, &cstate);

		      if (n == (size_t) -2)
			{
			  /* Possibly correct character, just not enough
			     input.  */
			  assert (cnt < MB_CUR_MAX);

			  if (inchar () == EOF)
			    encode_error ();

			  buf[cnt++] = c;
			  continue;
			}

		      if (n != cnt)
			encode_error ();

		      /* We have a match.  */
		      break;
		    }

		  if (!(flags & SUPPRESS) && (flags & MALLOC)
		      && wstr == (wchar_t *) *strptr + strsize)
		    {
		      /* Enlarge the buffer.  */
		      wstr = (wchar_t *) realloc (*strptr,
						  (2 * strsize
						   * sizeof (wchar_t)));
		      if (wstr == NULL)
			{
			  /* Can't allocate that much.  Last-ditch effort.  */
			  wstr = (wchar_t *) realloc (*strptr,
						      ((strsize + 1)
						       * sizeof (wchar_t)));
			  if (wstr == NULL)
			    {
			      /* We lose.  Oh well.  Terminate the
				 string and stop converting, so at
				 least we don't skip any input.  */
			      ((wchar_t *) (*strptr))[strsize - 1] = L'\0';
			      ++done;
			      conv_error ();
			    }
			  else
			    {
			      *strptr = (char *) wstr;
			      wstr += strsize;
			      ++strsize;
			    }
			}
		      else
			{
			  *strptr = (char *) wstr;
			  wstr += strsize;
			  strsize *= 2;
			}
		    }
		}
#endif
	      }
	    while ((width <= 0 || --width > 0) && inchar () != EOF);

	    if (!(flags & SUPPRESS))
	      {
		*wstr++ = L'\0';

		if ((flags & MALLOC) && wstr - (wchar_t *) *strptr != strsize)
		  {
		    wchar_t *cp = (wchar_t *) realloc (*strptr,
						       ((wstr
							 - (wchar_t *) *strptr)
							* sizeof(wchar_t)));
		    if (cp != NULL)
		      *strptr = (char *) cp;
		  }

		++done;
	      }
	  }
	  break;

	case L_('x'):	/* Hexadecimal integer.  */
	case L_('X'):	/* Ditto.  */
	  base = 16;
	  number_signed = 0;
	  goto number;

	case L_('o'):	/* Octal integer.  */
	  base = 8;
	  number_signed = 0;
	  goto number;

	case L_('u'):	/* Unsigned decimal integer.  */
	  base = 10;
	  number_signed = 0;
	  goto number;

	case L_('d'):	/* Signed decimal integer.  */
	  base = 10;
	  number_signed = 1;
	  goto number;

	case L_('i'):	/* Generic number.  */
	  base = 0;
	  number_signed = 1;

	number:
	  c = inchar ();
	  if (c == EOF)
	    input_error ();

	  /* Check for a sign.  */
	  if (c == L_('-') || c == L_('+'))
	    {
	      ADDW (c);
	      if (width > 0)
		--width;
	      c = inchar ();
	    }

	  /* Look for a leading indication of base.  */
	  if (width != 0 && c == L_('0'))
	    {
	      if (width > 0)
		--width;

	      ADDW (c);
	      c = inchar ();

	      if (width != 0 && TOLOWER (c) == L_('x'))
		{
		  if (base == 0)
		    base = 16;
		  if (base == 16)
		    {
		      if (width > 0)
			--width;
		      c = inchar ();
		    }
		}
	      else if (base == 0)
		base = 8;
	    }

	  if (base == 0)
	    base = 10;

	  if (base == 10 && (flags & I18N) != 0)
	    {
	      int from_level;
	      int to_level;
#ifdef COMPILE_WPRINTF
	      const wchar_t *wcdigits;
#else
	      const char *mbdigits[10];
#endif
	      int n;

	      from_level = 0;
#ifdef COMPILE_WPRINTF
	      to_level = _NL_CURRENT_WORD (LC_CTYPE,
					   _NL_CTYPE_INDIGITS_WC_LEN) - 1;
#else
	      to_level = _NL_CURRENT_WORD (LC_CTYPE,
					   _NL_CTYPE_INDIGITS_MB_LEN) - 1;
#endif

	      /* In this round we get the pointer to the digit strings
		 and also perform the first round of comparisons.  */
	      for (n = 0; n < 10; ++n)
		{
		  size_t dlen;
		  size_t dcnt;

		  /* Get the string for the digits with value N.  */
#ifdef COMPILE_WPRINTF
		  wcdigits[n] = _NL_CURRENT (LC_CTYPE,
					     _NL_CTYPE_INDIGITS0_WC + n);
		  if (c == *wcdigit[n])
		    break;

		  /* Advance the pointer to the next string.  */
		  ++wcdigits[n];
#else
		  mbdigits[n] = _NL_CURRENT (LC_CTYPE,
					     _NL_CTYPE_INDIGITS0_MB + n);
		  dlen = strlen (mbdigits[n]);

		  dcnt = 0;
		  do
		    {
		      if (c != mbdigits[n][dcnt])
			break;
		      c = inchar ();
		    }
		  while (--dcnt > 0);

		  if (dcnt == 0)
		    /* We found it.  */
		    break;

		  /* Advance the pointer to the next string.  */
		  mbdigits[n] += dlen + 1;
		}
#endif

	      if (n == 10)
		{
		  /*Have not yet found the digit.  */
		  while (++from_level <= to_level)
		    {
		      /* Search all ten digits of this level.  */
		      for (n = 0; n < 10; ++n)
			{
#ifdef COMPILE_WPRINTF
			  if (c == *wcdigit[n])
			    break;

			  /* Advance the pointer to the next string.  */
			  ++wcdigits[n];
#else
			  size_t dlen = strlen (mbdigits[n]);
			  size_t dcnt;

			  dcnt = 0;
			  do
			    {
			      if (c != mbdigits[n][dcnt])
				break;
			      c = inchar ();
			    }
			  while (--dcnt > 0);

			  if (dcnt == 0)
			    /* We found it.  */
			    break;

			  /* Advance the pointer to the next string.  */
			  mbdigits[n] += dlen + 1;
#endif
			}

		      if (n < 10)
			/* Found it.  */
			break;

		      /* Next level.  */
		      ++from_level;
		    }
		}

	      if (n == 10)
		{
		  /* Haven't found anything.  Push the last character back
		     and return an error.  */
		  ungetc (c, s);
		  input_error ();
		}

	      ADDW (L_('0') + n);
	    }
	  else
	    /* Read the number into workspace.  */
	    while (c != EOF && width != 0)
	      {
		if (base == 16 ? !ISXDIGIT (c) :
		    ((!ISDIGIT (c) || c - L_('0') >= base) &&
		     !((flags & GROUP) && base == 10 && c == thousands)))
		  break;
		ADDW (c);
		if (width > 0)
		  --width;

		c = inchar ();
	      }

	  if (wpsize == 0
	      || (wpsize == 1 && (wp[0] == L_('+') || wp[0] == L_('-'))))
	    {
	      /* There was no number.  If we are supposed to read a pointer
		 we must recognize "(nil)" as well.  */
	      if (wpsize == 0 && read_pointer && (width < 0 || width >= 0)
		  && c == '('
		  && TOLOWER (inchar ()) == L_('n')
		  && TOLOWER (inchar ()) == L_('i')
		  && TOLOWER (inchar ()) == L_('l')
		  && inchar () == L_(')'))
		/* We must produce the value of a NULL pointer.  A single
		   '0' digit is enough.  */
		ADDW (L_('0'));
	      else
		{
		  /* The last read character is not part of the number
		     anymore.  */
		  ungetc (c, s);

		  conv_error ();
		}
	    }
	  else
	    /* The just read character is not part of the number anymore.  */
	    ungetc (c, s);

	  /* Convert the number.  */
	  ADDW (L_('\0'));
	  if (need_longlong && (flags & LONGDBL))
	    {
	      if (number_signed)
		num.q = __strtoll_internal (wp, &tw, base, flags & GROUP);
	      else
		num.uq = __strtoull_internal (wp, &tw, base, flags & GROUP);
	    }
	  else
	    {
	      if (number_signed)
		num.l = __strtol_internal (wp, &tw, base, flags & GROUP);
	      else
		num.ul = __strtoul_internal (wp, &tw, base, flags & GROUP);
	    }
	  if (wp == tw)
	    conv_error ();

	  if (!(flags & SUPPRESS))
	    {
	      if (! number_signed)
		{
		  if (need_longlong && (flags & LONGDBL))
		    *ARG (unsigned LONGLONG int *) = num.uq;
		  else if (need_long && (flags & LONG))
		    *ARG (unsigned long int *) = num.ul;
		  else if (flags & SHORT)
		    *ARG (unsigned short int *)
		      = (unsigned short int) num.ul;
		  else if (!(flags & CHAR))
		    *ARG (unsigned int *) = (unsigned int) num.ul;
		  else
		    *ARG (unsigned char *) = (unsigned char) num.ul;
		}
	      else
		{
		  if (need_longlong && (flags & LONGDBL))
		    *ARG (LONGLONG int *) = num.q;
		  else if (need_long && (flags & LONG))
		    *ARG (long int *) = num.l;
		  else if (flags & SHORT)
		    *ARG (short int *) = (short int) num.l;
		  else if (!(flags & CHAR))
		    *ARG (int *) = (int) num.l;
		  else
		    *ARG (signed char *) = (signed char) num.ul;
		}
	      ++done;
	    }
	  break;

	case L_('e'):	/* Floating-point numbers.  */
	case L_('E'):
	case L_('f'):
	case L_('g'):
	case L_('G'):
	case L_('a'):
	case L_('A'):
	  c = inchar ();
	  if (c == EOF)
	    input_error ();

	  /* Check for a sign.  */
	  if (c == L_('-') || c == L_('+'))
	    {
	      negative = c == L_('-');
	      if (width == 0 || inchar () == EOF)
		/* EOF is only an input error before we read any chars.  */
		conv_error ();
	      if (! ISDIGIT (c) && c != decimal)
		{
		  /* This is no valid number.  */
		  ungetc (c, s);
		  input_error ();
		}
	      if (width > 0)
		--width;
	    }
	  else
	    negative = 0;

	  /* Take care for the special arguments "nan" and "inf".  */
	  if (TOLOWER (c) == L_('n'))
	    {
	      /* Maybe "nan".  */
	      ADDW (c);
	      if (width == 0 || inchar () == EOF || TOLOWER (c) != L_('a'))
		input_error ();
	      if (width > 0)
		--width;
	      ADDW (c);
	      if (width == 0 || inchar () == EOF || TOLOWER (c) != L_('n'))
		input_error ();
	      if (width > 0)
		--width;
	      ADDW (c);
	      /* It is "nan".  */
	      goto scan_float;
	    }
	  else if (TOLOWER (c) == L_('i'))
	    {
	      /* Maybe "inf" or "infinity".  */
	      ADDW (c);
	      if (width == 0 || inchar () == EOF || TOLOWER (c) != L_('n'))
		input_error ();
	      if (width > 0)
		--width;
	      ADDW (c);
	      if (width == 0 || inchar () == EOF || TOLOWER (c) != L_('f'))
		input_error ();
	      if (width > 0)
		--width;
	      ADDW (c);
	      /* It is as least "inf".  */
	      if (width != 0 && inchar () != EOF)
		{
		  if (TOLOWER (c) == L_('i'))
		    {
		      if (width > 0)
			--width;
		      /* Now we have to read the rest as well.  */
		      ADDW (c);
		      if (width == 0 || inchar () == EOF
			  || TOLOWER (c) != L_('n'))
			input_error ();
		      if (width > 0)
			--width;
		      ADDW (c);
		      if (width == 0 || inchar () == EOF
			  || TOLOWER (c) != L_('i'))
			input_error ();
		      if (width > 0)
			--width;
		      ADDW (c);
		      if (width == 0 || inchar () == EOF
			  || TOLOWER (c) != L_('t'))
			input_error ();
		      if (width > 0)
			--width;
		      ADDW (c);
		      if (width == 0 || inchar () == EOF
			  || TOLOWER (c) != L_('y'))
			input_error ();
		      if (width > 0)
			--width;
		      ADDW (c);
		    }
		  else
		    /* Never mind.  */
		    ungetc (c, s);
		}
	      goto scan_float;
	    }

	  is_hexa = 0;
	  exp_char = L_('e');
	  if (width != 0 && c == L_('0'))
	    {
	      ADDW (c);
	      c = inchar ();
	      if (width > 0)
		--width;
	      if (width != 0 && TOLOWER (c) == L_('x'))
		{
		  /* It is a number in hexadecimal format.  */
		  ADDW (c);

		  is_hexa = 1;
		  exp_char = L_('p');

		  /* Grouping is not allowed.  */
		  flags &= ~GROUP;
		  c = inchar ();
		  if (width > 0)
		    --width;
		}
	    }

	  got_dot = got_e = 0;
	  do
	    {
	      if (ISDIGIT (c))
		ADDW (c);
	      else if (!got_e && is_hexa && ISXDIGIT (c))
		ADDW (c);
	      else if (got_e && wp[wpsize - 1] == exp_char
		       && (c == L_('-') || c == L_('+')))
		ADDW (c);
	      else if (wpsize > 0 && !got_e && TOLOWER (c) == exp_char)
		{
		  ADDW (exp_char);
		  got_e = got_dot = 1;
		}
	      else if (c == decimal && !got_dot)
		{
		  ADDW (c);
		  got_dot = 1;
		}
	      else if ((flags & GROUP) && c == thousands && !got_dot)
		ADDW (c);
	      else
		{
		  /* The last read character is not part of the number
		     anymore.  */
		  ungetc (c, s);
		  break;
		}
	      if (width > 0)
		--width;
	    }
	  while (width != 0 && inchar () != EOF);

	  /* Have we read any character?  If we try to read a number
	     in hexadecimal notation and we have read only the `0x'
	     prefix or no exponent this is an error.  */
	  if (wpsize == 0 || (is_hexa && (wpsize == 2 || ! got_e)))
	    conv_error ();

	scan_float:
	  /* Convert the number.  */
	  ADDW (L_('\0'));
	  if (flags & LONGDBL)
	    {
	      long double d = __strtold_internal (wp, &tw, flags & GROUP);
	      if (!(flags & SUPPRESS) && tw != wp)
		*ARG (long double *) = negative ? -d : d;
	    }
	  else if (flags & LONG)
	    {
	      double d = __strtod_internal (wp, &tw, flags & GROUP);
	      if (!(flags & SUPPRESS) && tw != wp)
		*ARG (double *) = negative ? -d : d;
	    }
	  else
	    {
	      float d = __strtof_internal (wp, &tw, flags & GROUP);
	      if (!(flags & SUPPRESS) && tw != wp)
		*ARG (float *) = negative ? -d : d;
	    }

	  if (tw == wp)
	    conv_error ();

	  if (!(flags & SUPPRESS))
	    ++done;
	  break;

	case L_('['):	/* Character class.  */
	  if (flags & LONG)
	    STRING_ARG (wstr, wchar_t);
	  else
	    STRING_ARG (str, char);

	  if (*f == L_('^'))
	    {
	      ++f;
	      not_in = 1;
	    }
	  else
	    not_in = 0;

	  if (width < 0)
	    /* There is no width given so there is also no limit on the
	       number of characters we read.  Therefore we set width to
	       a very high value to make the algorithm easier.  */
	    width = INT_MAX;

#ifdef COMPILE_WPRINTF
	  /* Find the beginning and the end of the scanlist.  We are not
	     creating a lookup table since it would have to be too large.
	     Instead we search each time through the string.  This is not
	     a constant lookup time but who uses this feature deserves to
	     be punished.  */
	  tw = (wchar_t *) f;	/* Marks the beginning.  */

	  if (*f == ']' || *f == '-')
	    ++f;

	  while ((fc = *f++) != L'\0' && fc != L']');

	  if (fc == L'\0')
	    conv_error ();
	  wp = (wchar_t *) f - 1;
#else
	  /* Fill WP with byte flags indexed by character.
	     We will use this flag map for matching input characters.  */
	  if (wpmax < UCHAR_MAX)
	    {
	      wpmax = UCHAR_MAX;
	      wp = (char *) alloca (wpmax);
	    }
	  memset (wp, '\0', UCHAR_MAX);

	  fc = *f;
	  if (fc == ']' || fc == '-')
	    {
	      /* If ] or - appears before any char in the set, it is not
		 the terminator or separator, but the first char in the
		 set.  */
	      wp[fc] = 1;
	      ++f;
	    }

	  tw = (char *) f;
	  while ((fc = *f++) != '\0' && fc != ']')
	    if (fc == '-' && *f != '\0' && *f != ']' && f - 2 != tw
		&& (unsigned char) f[-2] <= (unsigned char) *f)
	      {
		/* Add all characters from the one before the '-'
		   up to (but not including) the next format char.  */
		for (fc = f[-2]; fc < *f; ++fc)
		  wp[fc] = 1;
	      }
	    else
	      /* Add the character to the flag map.  */
	      wp[fc] = 1;

	  if (fc == '\0')
	    conv_error();
#endif

	  if (flags & LONG)
	    {
	      size_t now = read_in;
#ifdef COMPILE_WPRINTF
	      do
		{
		  wchar_t *runp;

		  if (inchar () == WEOF)
		    break;

		  /* Test whether it's in the scanlist.  */
		  runp = tw;
		  while (runp < wp)
		    {
		      if (runp[0] == L'-' && runp[1] != '\0' && runp[1] != ']'
			  && runp != tw
			  && (unsigned int) runp[-1] <= (unsigned int) runp[1])
			{
			  /* Match against all characters in between the
			     first and last character of the sequence.  */
			  wchar_t wc;

			  for (wc = runp[-1] + 1; wc < runp[1]; ++wc)
			    if (wc == c)
			      break;

			  if (wc == runp[1] && !not_in)
			    break;
			  if (wc == runp[1] && not_in)
			    {
			      /* The current character is not in the
                                 scanset.  */
			      ungetwc (c, s);
			      goto out;
			    }
			}
		      else
			{
			  if (*runp == runp[1] && !not_in)
			    break;
			  if (*runp != runp[1] && not_in)
			    {
			      ungetwc (c ,s);
			      goto out;
			    }
			}

		      ++runp;
		    }

		  if (!(flags & SUPPRESS))
		    {
		      *wstr++ = c;

		      if ((flags & MALLOC)
			  && wstr == (wchar_t *) *strptr + strsize)
			{
			  /* Enlarge the buffer.  */
			  wstr = (wchar_t *) realloc (*strptr,
						      (2 * strsize)
						      * sizeof (wchar_t));
			  if (wstr == NULL)
			    {
			      /* Can't allocate that much.  Last-ditch
				 effort.  */
			      wstr = (wchar_t *)
				realloc (*strptr, (strsize
						   + sizeof (wchar_t)));
			      if (wstr == NULL)
				{
				  /* We lose.  Oh well.  Terminate the string
				     and stop converting, so at least we don't
				     skip any input.  */
				  ((wchar_t *) (*strptr))[strsize - 1] = L'\0';
				  ++done;
				  conv_error ();
				}
			      else
				{
				  *strptr = (char *) wstr;
				  wstr += strsize;
				  ++strsize;
				}
			    }
			  else
			    {
			      *strptr = (char *) wstr;
			      wstr += strsize;
			      strsize *= 2;
			    }
			}
		    }
		}
	      while (--width > 0);
	    out:
#else
	      char buf[MB_LEN_MAX];
	      size_t cnt = 0;
	      mbstate_t cstate;

	      memset (&cstate, '\0', sizeof (cstate));

	      do
		{
		again:
		  if (inchar () == EOF)
		    break;

		  if (wp[c] == not_in)
		    {
		      ungetc (c, s);
		      break;
		    }

		  /* This is easy.  */
		  if (!(flags & SUPPRESS))
		    {
		      size_t n;

		      /* Convert it into a wide character.  */
		      n = __mbrtowc (wstr, buf, cnt, &cstate);

		      if (n == (size_t) -2)
			{
			  /* Possibly correct character, just not enough
			     input.  */
			  assert (cnt < MB_CUR_MAX);
			  goto again;
			}

		      if (n != cnt)
			encode_error ();

		      ++wstr;
		      if ((flags & MALLOC)
			  && wstr == (wchar_t *) *strptr + strsize)
			{
			  /* Enlarge the buffer.  */
			  wstr = (wchar_t *) realloc (*strptr,
						      (2 * strsize
						       * sizeof (wchar_t)));
			  if (wstr == NULL)
			    {
			      /* Can't allocate that much.  Last-ditch
				 effort.  */
			      wstr = (wchar_t *)
				realloc (*strptr, ((strsize + 1)
						   * sizeof (wchar_t)));
			      if (wstr == NULL)
				{
				  /* We lose.  Oh well.  Terminate the
				     string and stop converting,
				     so at least we don't skip any input.  */
				  ((wchar_t *) (*strptr))[strsize - 1] = L'\0';
				  ++done;
				  conv_error ();
				}
			      else
				{
				  *strptr = (char *) wstr;
				  wstr += strsize;
				  ++strsize;
				}
			    }
			  else
			    {
			      *strptr = (char *) wstr;
			      wstr += strsize;
			      strsize *= 2;
			    }
			}
		    }
		}
	      while (--width > 0);

	      if (cnt != 0)
		/* We stopped in the middle of recognizing another
		   character.  That's a problem.  */
		encode_error ();
#endif

	      if (now == read_in)
		/* We haven't succesfully read any character.  */
		conv_error ();

	      if (!(flags & SUPPRESS))
		{
		  *wstr++ = L'\0';

		  if ((flags & MALLOC)
		      && wstr - (wchar_t *) *strptr != strsize)
		    {
		      wchar_t *cp = (wchar_t *)
			realloc (*strptr, ((wstr - (wchar_t *) *strptr)
					   * sizeof(wchar_t)));
		      if (cp != NULL)
			*strptr = (char *) cp;
		    }

		  ++done;
		}
	    }
	  else
	    {
	      size_t now = read_in;
#ifdef COMPILE_WPRINTF

	      memset (&state, '\0', sizeof (state));

	      do
		{
		  wchar_t *runp;
		  size_t n;

		  if (inchar () == WEOF)
		    break;

		  /* Test whether it's in the scanlist.  */
		  runp = tw;
		  while (runp < wp)
		    {
		      if (runp[0] == L'-' && runp[1] != '\0' && runp[1] != ']'
			  && runp != tw
			  && (unsigned int) runp[-1] <= (unsigned int) runp[1])
			{
			  /* Match against all characters in between the
			     first and last character of the sequence.  */
			  wchar_t wc;

			  for (wc = runp[-1] + 1; wc < runp[1]; ++wc)
			    if (wc == c)
			      break;

			  if (wc == runp[1] && !not_in)
			    break;
			  if (wc == runp[1] && not_in)
			    {
			      /* The current character is not in the
                                 scanset.  */
			      ungetwc (c, s);
			      goto out2;
			    }
			}
		      else
			{
			  if (*runp == runp[1] && !not_in)
			    break;
			  if (*runp != runp[1] && not_in)
			    {
			      ungetwc (c ,s);
			      goto out2;
			    }
			}

		      ++runp;
		    }

		  if (!(flags & SUPPRESS))
		    {
		      if ((flags & MALLOC)
			  && str + MB_CUR_MAX >= *strptr + strsize)
			{
			  /* Enlarge the buffer.  */
			  str = (char *) realloc (*strptr, 2 * strsize);
			  if (str == NULL)
			    {
			      /* Can't allocate that much.  Last-ditch
				 effort.  */
			      str = (char *) realloc (*strptr, strsize + 1);
			      if (str == NULL)
				{
				  /* We lose.  Oh well.  Terminate the string
				     and stop converting, so at least we don't
				     skip any input.  */
				  (*strptr)[strsize - 1] = '\0';
				  ++done;
				  conv_error ();
				}
			      else
				{
				  *strptr = str;
				  str += strsize;
				  ++strsize;
				}
			    }
			  else
			    {
			      *strptr = str;
			      str += strsize;
			      strsize *= 2;
			    }
			}
		    }

		  n = wcrtomb (!(flags & SUPPRESS) ? str : NULL, c, &state);
		  if (n == (size_t) -1)
		    encode_error ();

		  assert (n <= MB_CUR_MAX);
		  str += n;
		}
	      while (--width > 0);
	    out2:
#else
	      do
		{
		  if (inchar () == EOF)
		    break;

		  if (wp[c] == not_in)
		    {
		      ungetc (c, s);
		      break;
		    }

		  /* This is easy.  */
		  if (!(flags & SUPPRESS))
		    {
		      *str++ = c;
		      if ((flags & MALLOC)
			  && (char *) str == *strptr + strsize)
			{
			  /* Enlarge the buffer.  */
			  str = (char *) realloc (*strptr, 2 * strsize);
			  if (str == NULL)
			    {
			      /* Can't allocate that much.  Last-ditch
				 effort.  */
			      str = (char *) realloc (*strptr, strsize + 1);
			      if (str == NULL)
				{
				  /* We lose.  Oh well.  Terminate the
				     string and stop converting,
				     so at least we don't skip any input.  */
				  ((char *) (*strptr))[strsize - 1] = '\0';
				  ++done;
				  conv_error ();
				}
			      else
				{
				  *strptr = (char *) str;
				  str += strsize;
				  ++strsize;
				}
			    }
			  else
			    {
			      *strptr = (char *) str;
			      str += strsize;
			      strsize *= 2;
			    }
			}
		    }
		}
	      while (--width > 0);
#endif

	      if (now == read_in)
		/* We haven't succesfully read any character.  */
		conv_error ();

	      if (!(flags & SUPPRESS))
		{
#ifdef COMPILE_WPRINTF
		  /* We have to emit the code to get into the intial
		     state.  */
		  char buf[MB_LEN_MAX];
		  size_t n = wcrtomb (buf, L'\0', &state);
		  if (n > 0 && (flags & MALLOC)
		      && str + n >= *strptr + strsize)
		    {
		      /* Enlarge the buffer.  */
		      str = (char *) realloc (*strptr,
					      (str + n + 1) - *strptr);
		      if (str == NULL)
			{
			  /* We lose.  Oh well.  Terminate the string
			     and stop converting, so at least we don't
			     skip any input.  */
			  ((char *) (*strptr))[strsize - 1] = '\0';
			  ++done;
			  conv_error ();
			}
		      else
			{
			  *strptr = (char *) str;
			  str = ((char *) *strptr) + strsize;
			  strsize = (str + n + 1) - *strptr;
			}
		    }

		  str = __mempcpy (str, buf, n);
#endif
		  *str = '\0';

		  if ((flags & MALLOC) && str - *strptr != strsize)
		    {
		      char *cp = (char *) realloc (*strptr, str - *strptr);
		      if (cp != NULL)
			*strptr = cp;
		    }

		  ++done;
		}
	    }
	  break;

	case L_('p'):	/* Generic pointer.  */
	  base = 16;
	  /* A PTR must be the same size as a `long int'.  */
	  flags &= ~(SHORT|LONGDBL);
	  if (need_long)
	    flags |= LONG;
	  number_signed = 0;
	  read_pointer = 1;
	  goto number;

	default:
	  /* If this is an unknown format character punt.  */
	  conv_error ();
	}
    }

  /* The last thing we saw int the format string was a white space.
     Consume the last white spaces.  */
  if (skip_space)
    {
      do
	c = inchar ();
      while (ISSPACE (c));
      ungetc (c, s);
    }

  /* Unlock stream.  */
  UNLOCK_STREAM (s);

  return done;
}

#ifdef USE_IN_LIBIO
# ifdef COMPILE_WPRINTF
int
__vfwscanf (FILE *s, const wchar_t *format, va_list argptr)
{
  return _IO_vfwscanf (s, format, argptr, NULL);
}
# else
int
__vfscanf (FILE *s, const char *format, va_list argptr)
{
  return _IO_vfscanf (s, format, argptr, NULL);
}
# endif
#endif

#ifdef COMPILE_WPRINTF
weak_alias (__vfwscanf, vfwscanf)
#else
weak_alias (__vfscanf, vfscanf)
#endif