small_vfsscanf.c

/*
FUNCTION
<<vscanf>>, <<vfscanf>>, <<vsscanf>>---format argument list

INDEX
        vscanf
INDEX
        vfscanf
INDEX
        vsscanf

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

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

        int vfscanf( <[fp]>, <[fmt]>, <[list]>)
        FILE *<[fp]>;
        char *<[fmt]>;
        va_list <[list]>;
        
        int vsscanf( <[str]>, <[fmt]>, <[list]>)
        char *<[str]>;
        char *<[fmt]>;
        va_list <[list]>;

        int _vscanf_r( <[reent]>, <[fmt]>, <[ist]>)
        char *<[reent]>;
        char *<[fmt]>;
        va_list <[list]>;

        int _vfscanf_r( <[reent]>, <[fp]>, <[fmt]>, <[list]>)
        char *<[reent]>;
        FILE *<[fp]>;
        char *<[fmt]>;
        va_list <[list]>;
        
        int _vsscanf_r( <[reent]>, <[str]>, <[fmt]>, <[list]>)
        char *<[reent]>;
        char *<[str]>;
        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:
*/

/*-
 * 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.
 */



#include <_ansi.h>
//#include <ctype.h>
#include <wctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <wchar.h>
#include <string.h>


#ifdef _HAVE_STDC
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#ifndef SMALL_SCANF
#include "local.h"
#endif


#ifndef NO_FLOATING_POINT
#include <float.h>
#endif



#ifndef NO_FLOATING_POINT
#define FLOATING_POINT
#endif

#ifdef FLOATING_POINT
#include <float.h>

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

#define _NO_LONGLONG
#if defined WANT_PRINTF_LONG_LONG && defined __GNUC__
# undef _NO_LONGLONG
#endif

#include "floatio.h"

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

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


/*
 * Flags used during conversion.
 */

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

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

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

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

#define PFXOK           0x200   /* 0x prefix is (still) legal */
#define NZDIGITS        0x400   /* no zero digits detected */

/*
 * 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 */

#if 0
#define u_char unsigned char
#endif
#define u_char char
#define u_long unsigned long

#ifndef _NO_LONGLONG
typedef unsigned long long u_long_long;
#endif

/*static*/ u_char *__sccl ();

/*
 * vfscanf
 */

#ifndef SMALL_SCANF
#define BufferEmpty (fp->_r <= 0 && __srefill(fp))

#else // SMALL_SCANF

unsigned char buf_ungetc ;
int flag_buf_ungetc = 0  ;
#define buf_ungetc_empty 0
#define buf_ungetc_full  1


/*
        Redefinition of ungetc : store in a buffer a character 
        Only ONE ungetc is allowed before a getchar
   For each getchar, new_getchar() is called, then the buf is tested:
        - if flag_buf_ungetc == 0 : new_getchar call __io_getchar() 
        - if flag_buf_ungetc == 1 : new_getchar returns character in the buffer 
        
 */
   



int __io_ungetc(int c){

if (flag_buf_ungetc == 0){ 
   flag_buf_ungetc = buf_ungetc_full; //flag to 1 to indicate that a caracter is in the buffer
}
buf_ungetc= (unsigned char)c ;

return (c);
}

int new_getchar() {
if (flag_buf_ungetc == 0){
  
  return __io_getchar();

}
else {
   
        flag_buf_ungetc = buf_ungetc_empty;             
        return buf_ungetc;

}

}

#endif // SMALL_SCANF

#ifndef _REENT_ONLY

int
_DEFUN (vfscanf, (fp, fmt, ap), 
    register FILE *fp _AND 
    _CONST char *fmt _AND 
    va_list ap)
{
  
  #ifndef SMALL_SCANF
  CHECK_INIT(fp);
  #endif
  
  return __svfscanf_r (_REENT, fp, fmt, ap);
}

int
__svfscanf (fp, fmt0, ap)
     register FILE *fp;
     char _CONST *fmt0;
     va_list ap;
{
  return __svfscanf_r (_REENT, fp, fmt0, ap);
}

#endif /* !_REENT_ONLY */

int
_DEFUN (_vfscanf_r, (data, fp, fmt, ap),
    struct _reent *data _AND 
    register FILE *fp _AND 
    _CONST char *fmt _AND 
    va_list ap)
{
  return __svfscanf_r (data, fp, fmt, ap);
}



/* 


For SMALL_SCANF :
The use of files has been removed so as to use directly __io_getchar()
Buffer_empty is not anymore tested since _io_getchar() is blocked until
a character is entered.
Generally each *fp->_p ++  which equal to read a character on the file 
has been replaced by a new_getchar() which call __io_getchar(); 


*/

int
__svfscanf_r (rptr, fp, fmt0, ap)
     struct _reent *rptr;
     register FILE *fp;
     char _CONST *fmt0;
     va_list ap;
{
  
  register char * bufread;
  register u_char *fmt = (u_char *) fmt0;
  register int c;               /* character from format, or conversion */
  register int car;             
  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 */
  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;                /* length of converted multibyte sequence */
  mbstate_t state;              /* value to keep track of multibyte state */

  u_long (*ccfn) () = 0;        /* conversion function (strtol/strtoul) */
  char ccltab[256];             /* character class table for %[...] */
  char buf[BUF];                /* buffer for numeric conversions */
  char *lptr;                   /* literal pointer */

  char *cp;
  short *sp;
  int *ip;
  float *flp;
  _LONG_DOUBLE *ldp;
  double *dp;
  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};

  nassigned = 0;
  nread = 0;
  for (;;)
    {
#ifndef MB_CAPABLE
      wc = *fmt;
#else
      memset (&state, '\0', sizeof (state));
      nbytes = _mbtowc_r (rptr, &wc, fmt, MB_CUR_MAX, &state);
#endif
      fmt += nbytes;
      if (wc == 0)
        return nassigned;
      if (nbytes == 1 && isspace (wc))
        {
          for (;;)
            {
                        #ifndef SMALL_SCANF
              if (BufferEmpty || !isspace (*fp->_p))
                break;
              nread++, fp->_r--, fp->_p++;
             
              #else            
              if (!isspace (*fp->_p)) break;
              nread++, fp->_r--;
                *fp->_p = new_getchar();  
        
                #endif
            }
                
          continue;
        }
      if (wc != '%')
        goto literal;
      width = 0;
      flags = 0;

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

    again:
      c = *fmt++;
      switch (c)
        {
        case '%':
        literal:
          lptr = fmt - nbytes;
          for (n = 0; n < nbytes; ++n)
            {
         #ifndef SMALL_SCANF   
              if (BufferEmpty)
                goto input_failure;
              #else
                *fp->_p = new_getchar();
              #endif
              
              if (*fp->_p != *lptr)
                goto match_failure;
               #ifndef SMALL_SCANF 
              fp->_r--, fp->_p++;
              nread++;
              #else
                 fp->_r--;
                 *fp->_p = new_getchar();
                 nread++;
              #endif
              ++lptr;
            }
          continue;

        case '*':
          flags |= SUPPRESS;
          goto again;
        case 'l':
          if (*fmt == 'l')      /* Check for 'll' = long long (SUSv3) */
            {
              ++fmt;
              flags |= LONGDBL;
            }
          else
            flags |= LONG;
          goto again;
        case 'L':
          flags |= LONGDBL;
          goto again;
        case 'h':
          if (*fmt == 'h')      /* Check for 'hh' = char int (SUSv3) */
            {
              ++fmt;
              flags |= CHAR;
            }
          else
            flags |= SHORT;
          goto again;

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

          /*
           * Conversions. Those marked `compat' are for
           * 4.[123]BSD compatibility.
           *
           * (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 (*)())_strtol_r;
          base = 10;
          break;

        case 'i':
          c = CT_INT;
          ccfn = (u_long (*)())_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':               /* compat   XXX */
        case 'x':
          flags |= PFXOK;       /* enable 0x prefixing */
          c = CT_INT;
          ccfn = _strtoul_r;
          base = 16;
          break;

#ifdef FLOATING_POINT
        case 'E':               /* compat   XXX */
        case 'G':               /* compat   XXX */
/* ANSI says that E,G and X behave the same way as e,g,x */
          /* FALLTHROUGH */
        case 'e':
        case 'f':
        case 'g':
          c = CT_FLOAT;
          break;
#endif
        case 'S':
          flags |= LONG;
          /* FALLTHROUGH */

        case 's':
          c = CT_STRING;
          break;

        case '[':
          fmt = __sccl (ccltab, fmt);
          flags |= NOSKIP;
          c = CT_CCL;
          break;

        case 'C':
          flags |= LONG;
          /* FALLTHROUGH */

        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;
          if (flags & CHAR)
            {
              cp = va_arg (ap, char *);
              *cp = nread;
            }
          else if (flags & SHORT)
            {
              sp = va_arg (ap, short *);
              *sp = nread;
            }
          else if (flags & LONG)
            {
              lp = va_arg (ap, long *);
              *lp = nread;
            }
#ifndef _NO_LONGLONG
          else if (flags & LONGDBL)
            {
              llp = va_arg (ap, long long*);
              *llp = nread;
            }
#endif
          else
            {
              ip = va_arg (ap, int *);
              *ip = nread;
            }
          continue;

          /*
           * Disgusting backwards compatibility hacks.  XXX
           */
        case '\0':              /* compat */
          return EOF;

        default:                /* compat */
          if (isupper (c))
            flags |= LONG;
          c = CT_INT;
          ccfn = (u_long (*)())_strtol_r;
          base = 10;
          break;
        }

      /*
       * We have a conversion that requires input.
       */
   #ifndef SMALL_SCANF
      if (BufferEmpty)
        goto input_failure;
   #else
      *fp->_p = new_getchar();      
   #endif

      /*
       * Consume leading white space, except for formats that
       * suppress this.
       */

      if ((flags & NOSKIP) == 0)
        {
          while (isspace (*fp->_p))
            {
              #ifndef SMALL_SCANF 
                nread++;
              if (--fp->_r > 0)
                     fp->_p++;
              else
              if (__srefill (fp))
                   goto input_failure;
                   #else
                         *fp->_p = new_getchar();      
                #endif
            }
          /*
           * Note that there is at least one character in the
           * buffer, so conversions that do not set NOSKIP ca
           * no longer result in an input failure.
           */
        }

      /*
       * Do the conversion.
       */
      switch (c)
        {

        case CT_CHAR:
          /* scan arbitrary characters (sets NOSKIP) */
          if (width == 0)
            width = 1;
          if (flags & LONG) 
            {
              if ((flags & SUPPRESS) == 0)
                wcp = va_arg(ap, wchar_t *);
              else
                wcp = NULL;
              n = 0;
              while (width != 0) 
                {
                  
                  if (n == MB_CUR_MAX)
                    goto input_failure;
                  #ifndef SMALL_SCANF
                  buf[n++] = *fp->_p;
                  fp->_r -= 1;
                  fp->_p += 1;
                  memset((void *)&state, '\0', sizeof(mbstate_t));
                  if ((mbslen = _mbrtowc_r(rptr, wcp, buf, n, &state)) 
                                                         == (size_t)-1)
                    goto input_failure; /* Invalid sequence */
                  #else
                     buf[n++] = *fp->_p;
                        *fp->_p = new_getchar();
                                                                                                         
                                                #endif                 
                  
                  if (mbslen == 0 && !(flags & SUPPRESS))
                    *wcp = L'\0';
                  if (mbslen != (size_t)-2) /* Incomplete sequence */
                    {
                      nread += n;
                      width -= 1;
                      if (!(flags & SUPPRESS))
                        wcp += 1;
                      n = 0;
                    }
                  #ifndef SMALL_SCANF
                  if (BufferEmpty) 
                    {
                      if (n != 0) 
                        goto input_failure;
                      break;
                    }
                  #endif
                }
              if (!(flags & SUPPRESS))
                nassigned++;
            } 
          else if (flags & SUPPRESS) 
            {
              size_t sum = 0;
              for (;;)
                {
                  if ((n = fp->_r) < (int)width)
                    {
                      sum += n;
                      width -= n;       
                      #ifndef SMALL_SCANF          
                      fp->_p += n;                    
                      if (__srefill (fp))
                        {
                          if (sum == 0)
                            goto input_failure;
                          break;
                        }
                          #else
                          *fp->_p = new_getchar();                        
                          #endif
                         
                    }
                  else
                    {
                      sum += width;
                      fp->_r -= width;
                      #ifndef SMALL_SCANF
                      fp->_p += width;
                      #else
                      *fp->_p = new_getchar();
                      #endif
                      
                      break;
                    }
                }
              nread += sum;
            }
          else
            {
                
                        #ifndef SMALL_SCANF 
              size_t r = fread ((_PTR) va_arg (ap, char *), 1, width, fp);
              if (r == 0)
                   goto input_failure;
              nread += r;
              nassigned++;
                      
              #else
              bufread=(_PTR)va_arg(ap,char *);
              int r;
              for (r=0;r<width;r++){            
                *bufread++= *fp->_p;
                if ( r+1 < width){
                *fp->_p = new_getchar();
                }
                 }
                #endif                            
            }
          break;

        case CT_CCL:
          /* scan a (nonempty) character class (sets NOSKIP) */
          if (width == 0)
            width = ~0;         /* `infinity' */
          /* take only those things in the class */
          if (flags & SUPPRESS)
            {
              n = 0;
              while (ccltab[*fp->_p])
                {
                  #ifndef SMALL_SCANF
                  n++, fp->_r--, fp->_p++;
                  if (--width == 0)
                    break;
                  if (BufferEmpty)
                    {
                      if (n == 0)
                        goto input_failure;
                      break;
                    }
                   #else
                    n++;
                    fp->_r++;
                    *fp->_p = new_getchar();
                   #endif
                   
                }
              if (n == 0)
                goto match_failure;
            }
          else
            {
              p0 = p = va_arg (ap, char *);
              while (ccltab[*fp->_p])
                {
                  fp->_r--;
                  #ifndef SMALL_SCANF
                  *p++ = *fp->_p++;
                  if (--width == 0)
                    break;
                  if (BufferEmpty)
                    {
                      if (p == p0)
                        goto input_failure;
                      break;
                    }
                  #else
                   *p++ = *fp->_p;
                        *fp->_p= new_getchar();
                        if (--width == 0)
                    break;
                  #endif
                  
                }
              n = p - p0;
              if (n == 0)
                goto match_failure;
              *p = 0;
              nassigned++;
            }
          nread += n;
          break;

        case CT_STRING:
          /* like CCL, but zero-length string OK, & no NOSKIP */
          
          if (width == 0)
            width = (size_t)~0;
          if (flags & LONG) 
            {
              /* Process %S and %ls placeholders */
              if ((flags & SUPPRESS) == 0)
                wcp = va_arg(ap, wchar_t *);
              else
                wcp = &wc;
              n = 0;
              while (!isspace(*fp->_p) && width != 0) 
                {
                  if (n == MB_CUR_MAX)
                    goto input_failure;
                  buf[n++] = *fp->_p;
                  fp->_r -= 1;
                  #ifndef SMALL_SCANF
                  fp->_p += 1;
                  memset((void *)&state, '\0', sizeof(mbstate_t));
                  if ((mbslen = _mbrtowc_r(rptr, wcp, buf, n, &state)) 
                                                        == (size_t)-1)
                    goto input_failure;
                  #else
                  *fp->_p = new_getchar();
                  #endif
                  
                  if (mbslen == 0)
                    *wcp = L'\0';
                  
                  if (mbslen != (size_t)-2) /* Incomplete sequence */
                    {
                      if (iswspace(*wcp)) 
                        {
                          
                          while (n != 0)
                            #ifndef SMALL_SCANF
                            ungetc(buf[--n], fp);
                            #else
                            __io_ungetc(buf[--n]);
                            #endif
                          break;
                         
                        }
                        
                      nread += n;
                      width -= 1;
                      if ((flags & SUPPRESS) == 0)
                        wcp += 1;
                      n = 0;
                    }
                                #ifndef SMALL_SCANF
                  if (BufferEmpty) 
                    {
                      if (n != 0)
                        goto input_failure;
                      break;
                    }
                 #endif
                
                }
              if (!(flags & SUPPRESS)) 
                {
                  *wcp = L'\0';
                  nassigned++;
                }
            }
          else if (flags & SUPPRESS) 
            {
              n = 0;
              while (!isspace (*fp->_p))
                {
                  #ifndef SMALL_SCANF
                  n++, fp->_r--, fp->_p++;
                  if (--width == 0)
                    break;
                  if (BufferEmpty)
                    break;
                 #else
                    n++;
                    *fp->_p = new_getchar();                
                    if (*fp->_p == '\0') break;
                  #endif
                  
                }
              nread += n;
            }
          else
            {
              p0 = p = va_arg (ap, char *);
              while (!isspace (*fp->_p))
                {
                  #ifndef SMALL_SCANF
                  fp->_r--;
                  *p++ = *fp->_p++;
                  if (--width == 0)
                    break;
                  if (BufferEmpty)
                    break;
                  #else
                    *p++=*fp->_p;
                    *fp->_p = new_getchar();                
                    if (*fp->_p == '\0') break;
                  #endif
         
                  
                }
              *p = 0;
              nread += p - p0;
              nassigned++;
            }
          continue;

        case CT_INT:
          /* scan an integer as if by strtol/strtoul */
#ifdef hardway
          if (width == 0 || width > sizeof (buf) - 1)
            width = sizeof (buf) - 1;
#else
          /* size_t is unsigned, hence this optimisation */
          if (--width > sizeof (buf) - 2)
            width = sizeof (buf) - 2;
          width++;
#endif
          flags |= SIGNOK | NDIGITS | NZDIGITS;
          for (p = buf; width; width--)
            {     
              c = *fp->_p;
              /*
               * Switch on the character; `goto ok' if we
               * accept it as a part of number.
               */
              switch (c)
                {
                  /*
                   * The digit 0 is always legal, but is special.
                   * For %i conversions, if no digits (zero or nonzero)
                   * have been scanned (only signs), we will have base==0.
                   * In that case, we should set it to 8 and enable 0x
                   * prefixing. Also, if we have not scanned zero digits
                   * before this, do not turn off prefixing (someone else
                   * will turn it off if we have scanned any nonzero digits).
                   */
                case '0':
                  if (base == 0)
                    {
                      base = 8;
                      flags |= PFXOK;
                    }
                  if (flags & NZDIGITS)
                    flags &= ~(SIGNOK | NZDIGITS | NDIGITS);
                  else
                    flags &= ~(SIGNOK | PFXOK | NDIGITS);
                  goto ok;

                  /* 1 through 7 always legal */
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                  base = basefix[base];
                  flags &= ~(SIGNOK | PFXOK | NDIGITS);
                  goto ok;

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

                  /* letters ok iff hex */
                case 'A':
                case 'B':
                case 'C':
                case 'D':
                case 'E':
                case 'F':
                case 'a':
                case 'b':
                case 'c':
                case 'd':
                case 'e':
                case 'f':
                  /* no need to fix base here */
                  if (base <= 10)
                    break;      /* not legal here */
                  flags &= ~(SIGNOK | PFXOK | NDIGITS);
                  goto ok;

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

                  /* x ok iff flag still set & 2nd char */
                case 'x':
                case 'X':
                  if (flags & PFXOK && p == buf + 1)
                    {
                      base = 16;/* if %i */
                      flags &= ~PFXOK;
                      goto ok;
                    }             
                  break;
                }
              /*
               * If we got here, c is not a legal character
               * for a number.  Stop accumulating digits.
               */
                
              break;
            ok:
              /*
               * c is legal: store it and look at the next.
               */
              *p++ = c;
              #ifndef SMALL_SCANF
         if (--fp->_r > 0)
                                fp->_p++;
               else          
                        if (__srefill (fp))
                        break;          /* EOF */
                   #else
                           
                    *fp->_p = new_getchar();    
                                           
                   #endif
                             
        }
          /*
           * If we had only a sign, it is no good; push back the sign.
           * If the number ends in `x', it was [sign] '0' 'x', so push back
           * the x and treat it as [sign] '0'.
           */
          
          if (flags & NDIGITS)
            {
           if (p > buf)
               #ifndef SMALL_SCANF
                                _CAST_VOID ungetc (*(u_char *)-- p, fp);
                         #else
                                _CAST_VOID __io_ungetc (*(u_char *)-- p);
                         #endif
              goto match_failure;

            }
         
          c = ((u_char *) p)[-1];
          if (c == 'x' || c == 'X')
            {
              --p;
              #ifndef SMALL_SCANF
              /*(void)*/ ungetc (c, fp);
              #else 
                __io_ungetc (c);
              #endif
          
            }
          if ((flags & SUPPRESS) == 0)
            {
              u_long res;

              *p = 0;
              res = (*ccfn) (rptr, buf, (char **) NULL, base);
              if (flags & POINTER)
                *(va_arg (ap, _PTR *)) = (_PTR) (unsigned _POINTER_INT) res;
              else if (flags & CHAR)
                {
                  cp = va_arg (ap, char *);
                  *cp = res;
                }
              else if (flags & SHORT)
                {
                  sp = va_arg (ap, short *);
                  *sp = res;
                }
              else if (flags & LONG)
                {
                  lp = va_arg (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 = va_arg (ap, long long*);
                  *llp = resll;
                }
#endif
              else
                {
                  ip = va_arg (ap, int *);
                  *ip = res;
                }
              nassigned++;
            }
          nread += p - buf;
          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;
#ifdef hardway
          if (width == 0 || width > sizeof (buf) - 1)
            width = sizeof (buf) - 1;
#else
          /* size_t is unsigned, hence this optimisation */
          if (--width > sizeof (buf) - 2)
            width = sizeof (buf) - 2;
          width++;
#endif
          flags |= SIGNOK | NDIGITS | 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++;
                      goto fskip;
                    }
                  /* Fall through.  */
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                case '8':
                case '9':
                  flags &= ~(SIGNOK | NDIGITS);
                  goto fok;

                case '+':
                case '-':
                  if (flags & SIGNOK)
                    {
                      flags &= ~SIGNOK;
                      goto fok;
                    }
                  break;
                case '.':
                  if (flags & DPTOK)
                    {
                      flags &= ~(SIGNOK | DPTOK);
                      leading_zeroes = zeroes;
                      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;
                }
              break;
            fok:
              *p++ = c;
            fskip:
              width--;
              ++nread;
         #ifndef SMALL_SCANF
              if (--fp->_r > 0)
                fp->_p++;
              else
              if (__srefill (fp))
                break;          /* EOF */
                  #else
                     *fp->_p = new_getchar();
                    if ( (47<*fp->_p<58) && (64<*fp->_p < 71) && (96<*fp->_p<103) ){
                       ;
                    }
                    else
                    {
                       break;
                    }
                  #endif 
            }
          if (zeroes)
            flags &= ~NDIGITS;
          /*
           * 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)
        {
            #ifndef SMALL_SCANF
                      ungetc (*(u_char *)-- p, fp);
                      #else
                      __io_ungetc(*(u_char *)-- p);
                      #endif
            --nread;
         }
                    
                  goto match_failure;

                }
                  
              /* just a bad exponent (e and maybe sign) */
              c = *(u_char *)-- p;
              --nread;
              if (c != 'e' && c != 'E')
                {
                #ifndef SMALL_SCANF
                  _CAST_VOID ungetc (c, fp);    /* sign */
                #else
                  _CAST_VOID __io_ungetc (c);
                #endif
                  c = *(u_char *)-- p;
                  --nread;
                }
                #ifndef SMALL_SCANF
              _CAST_VOID ungetc (c, fp);
           #else
              _CAST_VOID __io_ungetc (c);
           #endif
          
            }
          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);
                }

              /* 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 (buf, NULL);
              else
#endif
                res = _strtod_r (rptr, buf, NULL);
              if (flags & LONG)
                {
                  dp = va_arg (ap, double *);
                  *dp = res;
                }
              else if (flags & LONGDBL)
                {
                  ldp = va_arg (ap, _LONG_DOUBLE *);
                  *ldp = QUAD_RES;
                }
              else
                {
                  flp = va_arg (ap, float *);
                  *flp = res;
                }
              nassigned++;
            }
          break;
        }
#endif /* FLOATING_POINT */

        }
    }
input_failure:
  return nassigned ? nassigned : -1;
match_failure:
  return nassigned;
}

/*
 * Fill in the given table from the scanset at the given format
 * (just after `[').  Return a pointer to the character past the
 * closing `]'.  The table has a 1 wherever characters should be
 * considered part of the scanset.
 */

/*static*/
u_char *
__sccl (tab, fmt)
     register char *tab;
     register u_char *fmt;
{
  register int c, n, v;

  /* first `clear' the whole table */
  c = *fmt++;                   /* first char hat => negated scanset */
  if (c == '^')
    {
      v = 1;                    /* default => accept */
      c = *fmt++;               /* get new first char */
    }
  else
    v = 0;                      /* default => reject */
  /* should probably use memset here */
  for (n = 0; n < 256; n++)
    tab[n] = v;
  if (c == 0)
    return fmt - 1;             /* format ended before closing ] */

  /*
   * Now set the entries corresponding to the actual scanset to the
   * opposite of the above.
   *
   * The first character may be ']' (or '-') without being special; the
   * last character may be '-'.
   */

  v = 1 - v;
  for (;;)
    {
      tab[c] = v;               /* take character c */
    doswitch:
      n = *fmt++;               /* and examine the next */
      switch (n)
        {

        case 0:         /* format ended too soon */
          return fmt - 1;

        case '-':
          /*
           * A scanset of the form [01+-] is defined as `the digit 0, the
           * digit 1, the character +, the character -', but the effect of a
           * scanset such as [a-zA-Z0-9] is implementation defined.  The V7
           * Unix scanf treats `a-z' as `the letters a through z', but treats
           * `a-a' as `the letter a, the character -, and the letter a'.
           *
           * For compatibility, the `-' is not considerd to define a range if
           * the character following it is either a close bracket (required by
           * ANSI) or is not numerically greater than the character we just
           * stored in the table (c).
           */
          n = *fmt;
          if (n == ']' || n < c)
            {
              c = '-';
              break;            /* resume the for(;;) */
            }
          fmt++;
          do
            {                   /* fill in the range */
              tab[++c] = v;
            }
          while (c < n);
#if 1                   /* XXX another disgusting compatibility hack */
          /*
           * Alas, the V7 Unix scanf also treats formats such
           * as [a-c-e] as `the letters a through e'. This too
           * is permitted by the standard....
           */
          goto doswitch;
#else
          c = *fmt++;
          if (c == 0)
            return fmt - 1;
          if (c == ']')
            return fmt;
#endif

          break;


        case ']':               /* end of scanset */
          return fmt;

        default:                /* just another character */
          c = n;
          break;
        }
    }
  /* NOTREACHED */
}