} while (inchar() != EOF && width != 0);
(void) inchar (); }
DEFUN(__vfscanf, (s, format, arg),      FILE *s AND CONST char *format AND va_list argptr){  va_list arg = (va_list) argptr;  register CONST char *f = format;  register char fc;		/* Current character of the format.  */  register size_t done = 0;	/* Assignments done.  */  register size_t read_in = 0;	/* Chars read in.  */  register int c;		/* Last char read.  */  register int do_assign;	/* Whether to do an assignment.  */  register int width;		/* Maximum field width.  */  int group_flag;		/* %' modifier flag.  */  /* Type modifiers.  */  int is_short, is_long, is_long_double;#ifdef	HAVE_LONGLONG  /* We use the `L' modifier for `long long int'.  */#define	is_longlong	is_long_double#else#define	is_longlong	0#endif  int malloc_string;		/* Args are char ** to be filled in.  */  /* Status for reading F-P nums.  */  char got_dot, got_e;  /* If a [...] is a [^...].  */  char not_in;  /* Base for integral numbers.  */  int base;  /* Signedness for integral numbers.  */  int number_signed;  /* Integral holding variables.  */  union    {      long long int q;      unsigned long long int uq;      long int l;      unsigned long int ul;    } num;  /* Character-buffer pointer.  */  register char *str, **strptr;  size_t strsize;  /* Workspace.  */  char work[200];  char *w;			/* Pointer into WORK.  */  wchar_t decimal;		/* Decimal point character.  */  if (!__validfp(s) || !s->__mode.__read || format == NULL)    {      errno = EINVAL;      return EOF;    }  /* Figure out the decimal point character.  */  if (mbtowc (&decimal, _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT),	      strlen (_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT))) <= 0)    decimal = (wchar_t) *_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT);  c = inchar();  /* Run through the format string.  */  while (*f != '\0')    {      unsigned int argpos;      /* Extract the next argument, which is of type TYPE.	 For a %N$... spec, this is the Nth argument from the beginning;	 otherwise it is the next argument after the state now in ARG.  */#define ARG(type)	(argpos == 0 ? va_arg (arg, type) :		      \			 ({ unsigned int pos = argpos;			      \			    va_list arg = (va_list) argptr;		      \			    while (--pos > 0)				      \			      (void) va_arg (arg, void *);		      \			    va_arg (arg, type);				      \			  }))      if (!isascii (*f))	{	  /* Non-ASCII, may be a multibyte.  */	  int len = mblen (f, strlen(f));	  if (len > 0)	    {	      while (len-- > 0)		if (c == EOF)		  input_error();		else if (c == *f++)		  (void) inchar();		else		  conv_error();	      continue;	    }	}      fc = *f++;      if (fc != '%')	{	  /* Characters other than format specs must just match.  */	  if (c == EOF)	    input_error();	  if (isspace(fc))	    {	      /* Whitespace characters match any amount of whitespace.  */	      while (isspace (c))		inchar ();	      continue;	    }	  else if (c == fc)	    (void) inchar();	  else	    conv_error();	  continue;	}      /* Initialize state of modifiers.  */      argpos = 0;      do_assign = 1;      group_flag = 0;      is_short = is_long = is_long_double = malloc_string = 0;      /* Check for a positional parameter specification.  */      if (isdigit (*f))	{	  argpos = *f++ - '0';	  while (isdigit (*f))	    argpos = argpos * 10 + (*f++ - '0');	  if (*f == '$')	    ++f;	  else	    {	      /* Oops; that was actually the field width.  */	      width = argpos;	      argpos = 0;	      goto got_width;	    }	}      /* Check for the assignment-suppressant and the number grouping flag.  */      while (*f == '*' || *f == '\'')	switch (*f++)	  {	  case '*':	    do_assign = 0;	    break;	  case '\'':	    group_flag = 1;	    break;	  }      /* Find the maximum field width.  */      width = 0;      while (isdigit(*f))	{	  width *= 10;	  width += *f++ - '0';	}    got_width:      if (width == 0)	width = -1;      /* Check for type modifiers.  */      while (*f == 'h' || *f == 'l' || *f == 'L' || *f == 'a' || *f == 'q')	switch (*f++)	  {	  case 'h':	    /* int's are short int's.  */	    is_short = 1;	    break;	  case 'l':	    if (is_long)	      /* A double `l' is equivalent to an `L'.  */	      is_longlong = 1;	    else	      /* int's are long int's.  */	      is_long = 1;	    break;	  case 'q':	  case 'L':	    /* double's are long double's, and int's are long long int's.  */	    is_long_double = 1;	    break;	  case 'a':	    /* String conversions (%s, %[) take a `char **'	       arg and fill it in with a malloc'd pointer.  */	    malloc_string = 1;	    break;	  }      /* End of the format string?  */      if (*f == '\0')	conv_error();      /* Find the conversion specifier.  */      w = work;      fc = *f++;      if (fc != '[' && fc != 'c' && fc != 'n')	/* Eat whitespace.  */	while (isspace(c))	  (void) inchar();      switch (fc)	{	case '%':	/* Must match a literal '%'.  */	  if (c != fc)	    conv_error();	  break;	case 'n':	/* Answer number of assignments done.  */	  if (do_assign)	    *ARG (int *) = read_in - 1;	/* Don't count the read-ahead.  */	  break;	case 'c':	/* Match characters.  */	  if (do_assign)	    {	      str = ARG (char *);	      if (str == NULL)		conv_error ();	    }	  if (c == EOF)	    input_error();	  if (width == -1)	    width = 1;	  if (do_assign)	    {	      do		*str++ = c;	      while (inchar() != EOF && --width > 0);	    }	  else	    while (inchar() != EOF && --width > 0);	  if (do_assign)	    ++done;	  break;	case 's':		/* Read a string.  */#define STRING_ARG							      \	  if (do_assign)						      \	    {								      \	      if (malloc_string)					      \		{							      \		  /* 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 = str = malloc (strsize);			      \		}							      \	      else							      \		str = ARG (char *);				      \	      if (str == NULL)						      \		conv_error ();						      \	    }	  STRING_ARG;	  if (c == EOF)	    input_error ();	  do	    {	      if (isspace (c))		break;#define	STRING_ADD_CHAR(c)						      \	      if (do_assign)						      \		{							      \		  *str++ = c;						      \		  if (malloc_string && str == *strptr + strsize)	      \		    {							      \		      /* Enlarge the buffer.  */			      \		      str = realloc (*strptr, strsize * 2);		      \		      if (str == NULL)					      \			{						      \			  /* Can't allocate that much.  Last-ditch effort.  */\			  str = realloc (*strptr, strsize + 1);		      \			  if (str == NULL)				      \			    {						      \			      /* We lose.  Oh well.			      \				 Terminate the string and stop converting,    \				 so at least we don't swallow any input.  */  \			      (*strptr)[strsize] = '\0';		      \			      ++done;					      \			      conv_error ();				      \			    }						      \			  else						      \			    {						      \			      *strptr = str;				      \			      str += strsize;				      \			      ++strsize;				      \			    }						      \			}						      \		      else						      \			{						      \			  *strptr = str;				      \			  str += strsize;				      \			  strsize *= 2;					      \			}						      \		    }							      \		}	      STRING_ADD_CHAR (c);	    } while (inchar () != EOF && (width <= 0 || --width > 0));	  if (do_assign)	    {	      *str = '\0';	      ++done;	    }	  break;	case 'x':	/* Hexadecimal integer.  */	case 'X':	/* Ditto.  */ 	  base = 16;	  number_signed = 0;	  goto number;	case 'o':	/* Octal integer.  */	  base = 8;	  number_signed = 0;	  goto number;	case 'u':	/* Unsigned decimal integer.  */	  base = 10;	  number_signed = 0;	  goto number;	case 'd':	/* Signed decimal integer.  */	  base = 10;	  number_signed = 1;	  goto number;	case 'i':	/* Generic number.  */	  base = 0;	  number_signed = 1;	number:	  if (c == EOF)	    input_error();	  /* Check for a sign.  */	  if (c == '-' || c == '+')	    {	      *w++ = c;	      if (width > 0)		--width;	      (void) inchar();	    }	  /* Look for a leading indication of base.  */	  if (c == '0')	    {	      if (width > 0)		--width;	      *w++ = '0';	      (void) inchar();	      if (tolower(c) == 'x')		{		  if (base == 0)		    base = 16;		  if (base == 16)		    {		      if (width > 0)			--width;		      (void) inchar();		    }		}	      else if (base == 0)		base = 8;	    }	  if (base == 0)	    base = 10;	  /* Read the number into WORK.  */	  do	    {	      if (base == 16 ? !isxdigit(c) :		  (!isdigit(c) || c - '0' >= base))		break;	      *w++ = c;	      if (width > 0)		--width;	    } while (inchar() != EOF && width != 0);	  if (w == work ||	      (w - work == 1 && (work[0] == '+' || work[0] == '-')))	    /* There was on number.  */	    conv_error();	  /* Convert the number.  */	  *w = '\0';	  if (is_longlong)	    {	      if (number_signed)		num.q = __strtoq_internal (work, &w, base, group_flag);	      else		num.uq = __strtouq_internal (work, &w, base, group_flag);	    }	  else	    {	      if (number_signed)		num.l = __strtol_internal (work, &w, base, group_flag);	      else		num.ul = __strtoul_internal (work, &w, base, group_flag);	    }	  if (w == work)	    conv_error ();	  if (do_assign)	    {	      if (! number_signed)		{		  if (is_longlong)		    *ARG (unsigned LONGLONG int *) = num.uq;		  else if (is_long)		    *ARG (unsigned long int *) = num.ul;		  else if (is_short)		    *ARG (unsigned short int *)		      = (unsigned short int) num.ul;		  else		    *ARG (unsigned int *) = (unsigned int) num.ul;		}	      else		{		  if (is_longlong)		    *ARG (LONGLONG int *) = num.q;		  else if (is_long)		    *ARG (long int *) = num.l;		  else if (is_short)		    *ARG (short int *) = (short int) num.l;		  else		    *ARG (int *) = (int) num.l;		}	      ++done;	    }	  break;	case 'e':	/* Floating-point numbers.  */	case 'E':	case 'f':	case 'g':	case 'G':	  if (c == EOF)	    input_error();	  /* Check for a sign.  */	  if (c == '-' || c == '+')	    {	      *w++ = c;	      if (inchar() == EOF)		/* EOF is only an input error before we read any chars.  */		conv_error();	      if (width > 0)		--width;	    }	  got_dot = got_e = 0;	  do	    {	      if (isdigit(c))		*w++ = c;	      else if (got_e && w[-1] == 'e' && (c == '-' || c == '+'))		*w++ = c;	      else if (!got_e && tolower(c) == 'e')		{		  *w++ = 'e';		  got_e = got_dot = 1;		}	      else if (c == decimal && !got_dot)		{		  *w++ = c;		  got_dot = 1;		}	      else		break;	      if (width > 0)		--width;	    } while (inchar() != EOF && width != 0);	  if (w == work)	    conv_error();	  if (w[-1] == '-' || w[-1] == '+' || w[-1] == 'e')	    conv_error();	  /* Convert the number.  */	  *w = '\0';	  if (is_long_double)	    {	      long double d = __strtold_internal (work, &w, group_flag);	      if (do_assign && w != work)		*ARG (long double *) = d;	    }	  else if (is_long)	    {	      double d = __strtod_internal (work, &w, group_flag);	      if (do_assign && w != work)		*ARG (double *) = d;	    }	  else	    {	      float d = __strtof_internal (work, &w, group_flag);	      if (do_assign && w != work)		*ARG (float *) = d;	    }	  if (w == work)	    conv_error ();	  if (do_assign)	    ++done;	  break;	case '[':	/* Character class.  */	  STRING_ARG;	  if (c == EOF)	    input_error();	  if (*f == '^')	    {	      ++f;	      not_in = 1;	    }	  else	    not_in = 0;	  while ((fc = *f++) != '\0' && fc != ']')	    {	      if (fc == '-' && *f != '\0' && *f != ']' &&		  w > work && w[-1] <= *f)		/* Add all characters from the one before the '-'		   up to (but not including) the next format char.  */		for (fc = w[-1] + 1; fc < *f; ++fc)		  *w++ = fc;	      else		/* Add the character to the list.  */		*w++ = fc;	    }	  if (fc == '\0')	    conv_error();	  *w = '\0';	  num.ul = read_in;	  do	    {	      if ((strchr (work, c) == NULL) != not_in)		break;	      STRING_ADD_CHAR (c);	      if (width > 0)		--width;	    } while (inchar () != EOF && width != 0);	  if (read_in == num.ul)	    conv_error ();	  if (do_assign)	    {	      *str = '\0';	      ++done;	    }	  break;	case 'p':	/* Generic pointer.  */	  base = 16;	  /* A PTR must be the same size as a `long int'.  */	  is_long = 1;	  goto number;	}    }  conv_error();}