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/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */
 
/*
FUNCTION
<<vfscanf>>, <<vscanf>>, <<vsscanf>>---format argument list
 
INDEX
        vfscanf
INDEX
        _vfscanf_r
INDEX
        vscanf
INDEX
        _vscanf_r
INDEX
        vsscanf
INDEX
        _vsscanf_r
 
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(struct _reent *<[reent]>, const char *<[fmt]>,
                       va_list <[list]>);
        int _vfscanf_r(struct _reent *<[reent]>, FILE *<[fp]>, const char *<[fmt]>,
                       va_list <[list]>);
        int _vsscanf_r(struct _reent *<[reent]>, const char *<[str]>,
                       const char *<[fmt]>, va_list <[list]>);
 
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]>)
        struct _reent *<[reent]>;
        char *<[fmt]>;
        va_list <[list]>;
 
        int _vfscanf_r( <[reent]>, <[fp]>, <[fmt]>, <[list]>)
        struct _reent *<[reent]>;
        FILE *<[fp]>;
        char *<[fmt]>;
        va_list <[list]>;
 
        int _vsscanf_r( <[reent]>, <[str]>, <[fmt]>, <[list]>)
        struct _reent *<[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:
*/
 
#include <_ansi.h>
#include <reent.h>
#include <newlib.h>
#include <ctype.h>
#include <wctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <limits.h>
#include <wchar.h>
#include <string.h>
#include <stdarg.h>
#include <errno.h>
#include "local.h"
 
#ifdef INTEGER_ONLY
#define VFSCANF vfiscanf
#define _VFSCANF_R _vfiscanf_r
#define __SVFSCANF __svfiscanf
#ifdef STRING_ONLY
#  define __SVFSCANF_R __ssvfiscanf_r
#else
#  define __SVFSCANF_R __svfiscanf_r
#endif
#else
#define VFSCANF vfscanf
#define _VFSCANF_R _vfscanf_r
#define __SVFSCANF __svfscanf
#ifdef STRING_ONLY
#  define __SVFSCANF_R __ssvfscanf_r
#else
#  define __SVFSCANF_R __svfscanf_r
#endif
#ifndef NO_FLOATING_POINT
#define FLOATING_POINT
#endif
#endif
 
#ifdef STRING_ONLY
#undef _flockfile
#undef _funlockfile
#define _flockfile(x) {}
#define _funlockfile(x) {}
#define _ungetc_r _sungetc_r
#define __srefill_r __ssrefill_r
#define _fread_r _sfread_r
#endif
 
#ifdef FLOATING_POINT
#include <math.h>
#include <float.h>
 
/* Currently a test is made to see if long double processing is warranted.
   This could be changed in the future should the _ldtoa_r code be
   preferred over _dtoa_r.  */
#define _NO_LONGDBL
#if defined _WANT_IO_LONG_DOUBLE && (LDBL_MANT_DIG > DBL_MANT_DIG)
#undef _NO_LONGDBL
extern _LONG_DOUBLE _strtold _PARAMS((char *s, char **sptr));
#endif
 
#include "floatio.h"
 
#if ((MAXEXP+MAXFRACT+3) > MB_LEN_MAX)
#  define BUF (MAXEXP+MAXFRACT+3)        /* 3 = sign + decimal point + NUL */
#else
#  define BUF MB_LEN_MAX
#endif
 
/* An upper bound for how long a long prints in decimal.  4 / 13 approximates
   log (2).  Add one char for roundoff compensation and one for the sign.  */
#define MAX_LONG_LEN ((CHAR_BIT * sizeof (long)  - 1) * 4 / 13 + 2)
#else
#define BUF     40
#endif
 
#define _NO_LONGLONG
#if defined _WANT_IO_LONG_LONG \
        && (defined __GNUC__ || __STDC_VERSION__ >= 199901L)
# undef _NO_LONGLONG
#endif
 
#define _NO_POS_ARGS
#ifdef _WANT_IO_POS_ARGS
# undef _NO_POS_ARGS
# ifdef NL_ARGMAX
#  define MAX_POS_ARGS NL_ARGMAX
# else
#  define MAX_POS_ARGS 32
# endif
 
static void * get_arg (int, va_list *, int *, void **);
#endif /* _WANT_IO_POS_ARGS */
 
/*
 * Flags used during conversion.
 */
 
#define LONG            0x01    /* l: long or double */
#define LONGDBL         0x02    /* L/ll: long double or long long */
#define SHORT           0x04    /* h: short */
#define CHAR            0x08    /* hh: 8 bit integer */
#define SUPPRESS        0x10    /* suppress assignment */
#define POINTER         0x20    /* weird %p pointer (`fake hex') */
#define NOSKIP          0x40    /* do not skip blanks */
 
/*
 * The following are used in numeric conversions only:
 * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
 * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
 */
 
#define SIGNOK          0x80    /* +/- is (still) legal */
#define NDIGITS         0x100   /* no digits detected */
 
#define DPTOK           0x200   /* (float) decimal point is still legal */
#define EXPOK           0x400   /* (float) exponent (e+3, etc) still legal */
 
#define PFXOK           0x200   /* 0x prefix is (still) legal */
#define NZDIGITS        0x400   /* no zero digits detected */
#define NNZDIGITS       0x800   /* no non-zero digits detected */
 
/*
 * Conversion types.
 */
 
#define CT_CHAR         0        /* %c conversion */
#define CT_CCL          1       /* %[...] conversion */
#define CT_STRING       2       /* %s conversion */
#define CT_INT          3       /* integer, i.e., strtol or strtoul */
#define CT_FLOAT        4       /* floating, i.e., strtod */
 
#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
 
/*
 * vfscanf
 */
 
#define BufferEmpty (fp->_r <= 0 && __srefill_r(rptr, fp))
 
#ifndef STRING_ONLY
 
#ifndef _REENT_ONLY
 
int
_DEFUN(VFSCANF, (fp, fmt, ap),
       register FILE *fp _AND
       _CONST char *fmt _AND
       va_list ap)
{
  CHECK_INIT(_REENT, fp);
  return __SVFSCANF_R (_REENT, fp, fmt, ap);
}
 
int
_DEFUN(__SVFSCANF, (fp, fmt0, ap),
       register FILE *fp _AND
       char _CONST *fmt0 _AND
       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)
{
  CHECK_INIT(data, fp);
  return __SVFSCANF_R (data, fp, fmt, ap);
}
#endif /* !STRING_ONLY */
 
#ifdef STRING_ONLY
/* When dealing with the sscanf family, we don't want to use the
 * regular ungetc which will drag in file I/O items we don't need.
 * So, we create our own trimmed-down version.  */
static int
_DEFUN(_sungetc_r, (data, fp, ch),
        struct _reent *data _AND
        int c               _AND
        register FILE *fp)
{
  if (c == EOF)
    return (EOF);
 
  /* After ungetc, we won't be at eof anymore */
  fp->_flags &= ~__SEOF;
  c = (unsigned char) c;
 
  /*
   * If we are in the middle of ungetc'ing, just continue.
   * This may require expanding the current ungetc buffer.
   */
 
  if (HASUB (fp))
    {
      if (fp->_r >= fp->_ub._size && __submore (data, fp))
        {
          return EOF;
        }
      *--fp->_p = c;
      fp->_r++;
      return c;
    }
 
  /*
   * If we can handle this by simply backing up, do so,
   * but never replace the original character.
   * (This makes sscanf() work when scanning `const' data.)
   */
 
  if (fp->_bf._base != NULL && fp->_p > fp->_bf._base && fp->_p[-1] == c)
    {
      fp->_p--;
      fp->_r++;
      return c;
    }
 
  /*
   * Create an ungetc buffer.
   * Initially, we will use the `reserve' buffer.
   */
 
  fp->_ur = fp->_r;
  fp->_up = fp->_p;
  fp->_ub._base = fp->_ubuf;
  fp->_ub._size = sizeof (fp->_ubuf);
  fp->_ubuf[sizeof (fp->_ubuf) - 1] = c;
  fp->_p = &fp->_ubuf[sizeof (fp->_ubuf) - 1];
  fp->_r = 1;
  return c;
}
 
/* String only version of __srefill_r for sscanf family.  */
static int
_DEFUN(__ssrefill_r, (ptr, fp),
       struct _reent * ptr _AND
       register FILE * fp)
{
  /*
   * Our only hope of further input is the ungetc buffer.
   * If there is anything in that buffer to read, return.
   */
  if (HASUB (fp))
    {
      FREEUB (ptr, fp);
      if ((fp->_r = fp->_ur) != 0)
        {
          fp->_p = fp->_up;
          return 0;
        }
    }
 
  /* Otherwise we are out of character input.  */
  fp->_p = fp->_bf._base;
  fp->_r = 0;
  fp->_flags |= __SEOF;
  return EOF;
}
 
static size_t
_DEFUN(_sfread_r, (ptr, buf, size, count, fp),
       struct _reent * ptr _AND
       _PTR buf _AND
       size_t size _AND
       size_t count _AND
       FILE * fp)
{
  register size_t resid;
  register char *p;
  register int r;
  size_t total;
 
  if ((resid = count * size) == 0)
    return 0;
 
  total = resid;
  p = buf;
 
  while (resid > (r = fp->_r))
    {
      _CAST_VOID memcpy ((_PTR) p, (_PTR) fp->_p, (size_t) r);
      fp->_p += r;
      fp->_r = 0;
      p += r;
      resid -= r;
      if (__ssrefill_r (ptr, fp))
        {
          /* no more input: return partial result */
          return (total - resid) / size;
        }
    }
  _CAST_VOID memcpy ((_PTR) p, (_PTR) fp->_p, resid);
  fp->_r -= resid;
  fp->_p += resid;
  return count;
}
#endif /* STRING_ONLY */
 
int
_DEFUN(__SVFSCANF_R, (rptr, fp, fmt0, ap),
       struct _reent *rptr _AND
       register FILE *fp   _AND
       char _CONST *fmt0   _AND
       va_list ap)
{
  register u_char *fmt = (u_char *) fmt0;
  register int c;               /* character from format, or conversion */
  register size_t width;        /* field width, or 0 */
  register char *p;             /* points into all kinds of strings */
  register int n;               /* handy integer */
  register int flags;           /* flags as defined above */
  register char *p0;            /* saves original value of p when necessary */
  int nassigned;                /* number of fields assigned */
  int nread;                    /* number of characters consumed from fp */
#ifndef _NO_POS_ARGS
  int N;                        /* arg number */
  int arg_index = 0;             /* index into args processed directly */
  int numargs = 0;               /* number of varargs read */
  void *args[MAX_POS_ARGS];     /* positional args read */
  int is_pos_arg;               /* is current format positional? */
#endif
  int base = 0;                  /* base argument to strtol/strtoul */
  int nbytes = 1;               /* number of bytes read from fmt string */
  wchar_t wc;                   /* wchar to use to read format string */
  wchar_t *wcp;                 /* handy wide character pointer */
  size_t mbslen;                /* length of converted multibyte sequence */
  mbstate_t state;              /* value to keep track of multibyte state */
 
  #define CCFN_PARAMS   _PARAMS((struct _reent *, const char *, char **, int))
  u_long (*ccfn)CCFN_PARAMS=0;   /* conversion function (strtol/strtoul) */
  char ccltab[256];             /* character class table for %[...] */
  char buf[BUF];                /* buffer for numeric conversions */
  char *lptr;                   /* literal pointer */
 
  char *cp;
  short *sp;
  int *ip;
#ifdef FLOATING_POINT
  float *flp;
  _LONG_DOUBLE *ldp;
  double *dp;
#endif
  long *lp;
#ifndef _NO_LONGLONG
  long long *llp;
#endif
 
  /* `basefix' is used to avoid `if' tests in the integer scanner */
  static _CONST short basefix[17] =
    {10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
 
  /* Macro to support positional arguments */
#ifndef _NO_POS_ARGS
# define GET_ARG(n, ap, type)                                   \
  ((type) (is_pos_arg                                           \
           ? (n < numargs                                       \
              ? args[n]                                         \
              : get_arg (n, &ap, &numargs, args))               \
           : (arg_index++ < numargs                             \
              ? args[n]                                         \
              : (numargs < MAX_POS_ARGS                         \
                 ? args[numargs++] = va_arg (ap, void *)        \
                 : va_arg (ap, void *)))))
#else
# define GET_ARG(n, ap, type) (va_arg (ap, type))
#endif
 
  _flockfile (fp);
 
  ORIENT (fp, -1);
 
  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)
        goto all_done;
      if (nbytes == 1 && isspace (wc))
        {
          for (;;)
            {
              if (BufferEmpty || !isspace (*fp->_p))
                break;
              nread++, fp->_r--, fp->_p++;
            }
          continue;
        }
      if (wc != '%')
        goto literal;
      width = 0;
      flags = 0;
#ifndef _NO_POS_ARGS
      N = arg_index;
      is_pos_arg = 0;
#endif
 
      /*
       * switch on the format.  continue if done; break once format
       * type is derived.
       */
 
    again:
      c = *fmt++;
 
      switch (c)
        {
        case '%':
        literal:
          lptr = fmt - nbytes;
          for (n = 0; n < nbytes; ++n)
            {
              if (BufferEmpty)
                goto input_failure;
              if (*fp->_p != *lptr)
                goto match_failure;
              fp->_r--, fp->_p++;
              nread++;
              ++lptr;
            }
          continue;
 
        case '*':
          flags |= SUPPRESS;
          goto again;
        case 'l':
#if defined _WANT_IO_C99_FORMATS || !defined _NO_LONGLONG
          if (*fmt == 'l')      /* Check for 'll' = long long (SUSv3) */
            {
              ++fmt;
              flags |= LONGDBL;
            }
          else
#endif
            flags |= LONG;
          goto again;
        case 'L':
          flags |= LONGDBL;
          goto again;
        case 'h':
#ifdef _WANT_IO_C99_FORMATS
          if (*fmt == 'h')      /* Check for 'hh' = char int (SUSv3) */
            {
              ++fmt;
              flags |= CHAR;
            }
          else
#endif
            flags |= SHORT;
          goto again;
#ifdef _WANT_IO_C99_FORMATS
        case 'j': /* intmax_t */
          if (sizeof (intmax_t) == sizeof (long))
            flags |= LONG;
          else
            flags |= LONGDBL;
          goto again;
        case 't': /* ptrdiff_t */
          if (sizeof (ptrdiff_t) < sizeof (int))
            /* POSIX states ptrdiff_t is 16 or more bits, as
               is short.  */
            flags |= SHORT;
          else if (sizeof (ptrdiff_t) == sizeof (int))
            /* no flag needed */;
          else if (sizeof (ptrdiff_t) <= sizeof (long))
            flags |= LONG;
          else
            /* POSIX states that at least one programming
               environment must support ptrdiff_t no wider than
               long, but that means other environments can
               have ptrdiff_t as wide as long long.  */
            flags |= LONGDBL;
          goto again;
        case 'z': /* size_t */
          if (sizeof (size_t) < sizeof (int))
            /* POSIX states size_t is 16 or more bits, as is short.  */
            flags |= SHORT;
          else if (sizeof (size_t) == sizeof (int))
            /* no flag needed */;
          else if (sizeof (size_t) <= sizeof (long))
            flags |= LONG;
          else
            /* POSIX states that at least one programming
               environment must support size_t no wider than
               long, but that means other environments can
               have size_t as wide as long long.  */
            flags |= LONGDBL;
          goto again;
#endif /* _WANT_IO_C99_FORMATS */
 
        case '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;
 
#ifndef _NO_POS_ARGS
        case '$':
          if (width <= MAX_POS_ARGS)
            {
              N = width - 1;
              is_pos_arg = 1;
              width = 0;
              goto again;
            }
          rptr->_errno = EINVAL;
          goto input_failure;
#endif /* !_NO_POS_ARGS */
 
          /*
           * Conversions. Those marked `compat' are for
           * 4.[123]BSD compatibility.
           *
           * (According to ANSI, E and X formats are supposed to
           * the same as e and x.  Sorry about that.)
           */
 
        case 'D':               /* compat */
          flags |= LONG;
          /* FALLTHROUGH */
        case 'd':
          c = CT_INT;
          ccfn = (u_long (*)CCFN_PARAMS)_strtol_r;
          base = 10;
          break;
 
        case 'i':
          c = CT_INT;
          ccfn = (u_long (*)CCFN_PARAMS)_strtol_r;
          base = 0;
          break;
 
        case 'O':               /* compat */
          flags |= LONG;
          /* FALLTHROUGH */
        case 'o':
          c = CT_INT;
          ccfn = _strtoul_r;
          base = 8;
          break;
 
        case 'u':
          c = CT_INT;
          ccfn = _strtoul_r;
          base = 10;
          break;
 
        case 'X':
        case 'x':
          flags |= PFXOK;       /* enable 0x prefixing */
          c = CT_INT;
          ccfn = _strtoul_r;
          base = 16;
          break;
 
#ifdef FLOATING_POINT
# ifdef _WANT_IO_C99_FORMATS
        case 'a':
        case 'A':
        case 'F':
# endif
        case 'E':
        case 'G':
        case 'e':
        case 'f':
        case 'g':
          c = CT_FLOAT;
          break;
#endif
 
#ifdef _WANT_IO_C99_FORMATS
        case 'S':
          flags |= LONG;
          /* FALLTHROUGH */
#endif
 
        case 's':
          c = CT_STRING;
          break;
 
        case '[':
          fmt = __sccl (ccltab, fmt);
          flags |= NOSKIP;
          c = CT_CCL;
          break;
 
#ifdef _WANT_IO_C99_FORMATS
        case 'C':
          flags |= LONG;
          /* FALLTHROUGH */
#endif
 
        case 'c':
          flags |= NOSKIP;
          c = CT_CHAR;
          break;
 
        case 'p':               /* pointer format is like hex */
          flags |= POINTER | PFXOK;
          c = CT_INT;
          ccfn = _strtoul_r;
          base = 16;
          break;
 
        case 'n':
          if (flags & SUPPRESS) /* ??? */
            continue;
#ifdef _WANT_IO_C99_FORMATS
          if (flags & CHAR)
            {
              cp = GET_ARG (N, ap, char *);
              *cp = nread;
            }
          else
#endif
          if (flags & SHORT)
            {
              sp = GET_ARG (N, ap, short *);
              *sp = nread;
            }
          else if (flags & LONG)
            {
              lp = GET_ARG (N, ap, long *);
              *lp = nread;
            }
#ifndef _NO_LONGLONG
          else if (flags & LONGDBL)
            {
              llp = GET_ARG (N, ap, long long*);
              *llp = nread;
            }
#endif
          else
            {
              ip = GET_ARG (N, ap, int *);
              *ip = nread;
            }
          continue;
 
          /*
           * Disgusting backwards compatibility hacks.  XXX
           */
        case '\0':              /* compat */
          _funlockfile (fp);
          return EOF;
 
        default:                /* compat */
          if (isupper (c))
            flags |= LONG;
          c = CT_INT;
          ccfn = (u_long (*)CCFN_PARAMS)_strtol_r;
          base = 10;
          break;
        }
 
      /*
       * We have a conversion that requires input.
       */
      if (BufferEmpty)
        goto input_failure;
 
      /*
       * Consume leading white space, except for formats that
       * suppress this.
       */
      if ((flags & NOSKIP) == 0)
        {
          while (isspace (*fp->_p))
            {
              nread++;
              if (--fp->_r > 0)
                fp->_p++;
              else
              if (__srefill_r (rptr, fp))
                goto input_failure;
            }
          /*
           * Note that there is at least one character in the
           * buffer, so conversions that do not set NOSKIP ca
           * no longer result in an input failure.
           */
        }
 
      /*
       * Do the conversion.
       */
      switch (c)
        {
 
        case CT_CHAR:
          /* scan arbitrary characters (sets NOSKIP) */
          if (width == 0)
            width = 1;
#if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 2
          if (flags & LONG)
            {
              if ((flags & SUPPRESS) == 0)
                wcp = GET_ARG (N, ap, wchar_t *);
              else
                wcp = NULL;
              n = 0;
              while (width != 0)
                {
                  if (n == MB_CUR_MAX)
                    goto input_failure;
                  buf[n++] = *fp->_p;
                  fp->_r -= 1;
                  fp->_p += 1;
                  memset ((_PTR)&state, '\0', sizeof (mbstate_t));
                  if ((mbslen = _mbrtowc_r (rptr, wcp, buf, n, &state))
                                                         == (size_t)-1)
                    goto input_failure; /* Invalid sequence */
                  if (mbslen == 0 && !(flags & SUPPRESS))
                    *wcp = L'\0';
                  if (mbslen != (size_t)-2) /* Incomplete sequence */
                    {
                      nread += n;
                      width -= 1;
                      if (!(flags & SUPPRESS))
                        wcp += 1;
                      n = 0;
                    }
                  if (BufferEmpty)
                    {
                      if (n != 0)
                        goto input_failure;
                      break;
                    }
                }
              if (!(flags & SUPPRESS))
                nassigned++;
            }
          else
#endif
                  if (flags & SUPPRESS)
            {
              size_t sum = 0;
              for (;;)
                {
                  if ((n = fp->_r) < (int)width)
                    {
                      sum += n;
                      width -= n;
                      fp->_p += n;
                      if (__srefill_r (rptr, fp))
                        {
                          if (sum == 0)
                            goto input_failure;
                          break;
                        }
                    }
                  else
                    {
                      sum += width;
                      fp->_r -= width;
                      fp->_p += width;
                      break;
                    }
                }
              nread += sum;
            }
          else
            {
              size_t r = _fread_r (rptr, (_PTR) GET_ARG (N, ap, char *), 1, width, fp);
 
              if (r == 0)
                goto input_failure;
              nread += r;
              nassigned++;
            }
          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])
                {
                  n++, fp->_r--, fp->_p++;
                  if (--width == 0)
                    break;
                  if (BufferEmpty)
                    {
                      if (n == 0)
                        goto input_failure;
                      break;
                    }
                }
              if (n == 0)
                goto match_failure;
            }
          else
            {
              p0 = p = GET_ARG (N, ap, char *);
              while (ccltab[*fp->_p])
                {
                  fp->_r--;
                  *p++ = *fp->_p++;
                  if (--width == 0)
                    break;
                  if (BufferEmpty)
                    {
                      if (p == p0)
                        goto input_failure;
                      break;
                    }
                }
              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 !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 2
          if (flags & LONG)
            {
              /* Process %S and %ls placeholders */
              if ((flags & SUPPRESS) == 0)
                wcp = GET_ARG (N, 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;
                  fp->_p += 1;
                  memset ((_PTR)&state, '\0', sizeof (mbstate_t));
                  if ((mbslen = _mbrtowc_r (rptr, wcp, buf, n, &state))
                                                        == (size_t)-1)
                    goto input_failure;
                  if (mbslen == 0)
                    *wcp = L'\0';
                  if (mbslen != (size_t)-2) /* Incomplete sequence */
                    {
                      if (iswspace(*wcp))
                        {
                          while (n != 0)
                            _ungetc_r (rptr, (unsigned char) buf[--n], fp);
                          break;
                        }
                      nread += n;
                      width -= 1;
                      if ((flags & SUPPRESS) == 0)
                        wcp += 1;
                      n = 0;
                    }
                  if (BufferEmpty)
                    {
                      if (n != 0)
                        goto input_failure;
                      break;
                    }
                }
              if (!(flags & SUPPRESS))
                {
                  *wcp = L'\0';
                  nassigned++;
                }
            }
          else
#endif
                  if (flags & SUPPRESS)
            {
              n = 0;
              while (!isspace (*fp->_p))
                {
                  n++, fp->_r--, fp->_p++;
                  if (--width == 0)
                    break;
                  if (BufferEmpty)
                    break;
                }
              nread += n;
            }
          else
            {
              p0 = p = GET_ARG (N, ap, char *);
              while (!isspace (*fp->_p))
                {
                  fp->_r--;
                  *p++ = *fp->_p++;
                  if (--width == 0)
                    break;
                  if (BufferEmpty)
                    break;
                }
              *p = 0;
              nread += p - p0;
              nassigned++;
            }
          continue;
 
        case CT_INT:
        {
          /* scan an integer as if by strtol/strtoul */
          unsigned width_left = 0;
          int skips = 0;
#ifdef hardway
          if (width == 0 || width > sizeof (buf) - 1)
#else
          /* size_t is unsigned, hence this optimisation */
          if (width - 1 > sizeof (buf) - 2)
#endif
            {
              width_left = width - (sizeof (buf) - 1);
              width = sizeof (buf) - 1;
            }
          flags |= SIGNOK | NDIGITS | NZDIGITS | NNZDIGITS;
          for (p = buf; width; width--)
            {
              c = *fp->_p;
              /*
               * Switch on the character; `goto ok' if we
               * accept it as a part of number.
               */
              switch (c)
                {
                  /*
                   * The digit 0 is always legal, but is special.
                   * For %i conversions, if no digits (zero or nonzero)
                   * have been scanned (only signs), we will have base==0.
                   * In that case, we should set it to 8 and enable 0x
                   * prefixing. Also, if we have not scanned zero digits
                   * before this, do not turn off prefixing (someone else
                   * will turn it off if we have scanned any nonzero digits).
                   */
                case '0':
                  if (! (flags & NNZDIGITS))
                    goto ok;
                  if (base == 0)
                    {
                      base = 8;
                      flags |= PFXOK;
                    }
                  if (flags & NZDIGITS)
                    {
                      flags &= ~(SIGNOK | NZDIGITS | NDIGITS);
                      goto ok;
                    }
                  flags &= ~(SIGNOK | PFXOK | NDIGITS);
                  if (width_left)
                    {
                      width_left--;
                      width++;
                    }
                  ++skips;
                  goto skip;
 
                  /* 1 through 7 always legal */
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                  base = basefix[base];
                  flags &= ~(SIGNOK | PFXOK | NDIGITS | NNZDIGITS);
                  goto ok;
 
                  /* digits 8 and 9 ok iff decimal or hex */
                case '8':
                case '9':
                  base = basefix[base];
                  if (base <= 8)
                    break;      /* not legal here */
                  flags &= ~(SIGNOK | PFXOK | NDIGITS | NNZDIGITS);
                  goto ok;
 
                  /* letters ok iff hex */
                case 'A':
                case 'B':
                case 'C':
                case 'D':
                case 'E':
                case 'F':
                case 'a':
                case 'b':
                case 'c':
                case 'd':
                case 'e':
                case 'f':
                  /* no need to fix base here */
                  if (base <= 10)
                    break;      /* not legal here */
                  flags &= ~(SIGNOK | PFXOK | NDIGITS | NNZDIGITS);
                  goto ok;
 
                  /* sign ok only as first character */
                case '+':
                case '-':
                  if (flags & SIGNOK)
                    {
                      flags &= ~SIGNOK;
                      goto ok;
                    }
                  break;
 
                  /* x ok iff flag still set & single 0 seen */
                case 'x':
                case 'X':
                  if ((flags & (PFXOK | NZDIGITS)) == PFXOK)
                    {
                      base = 16;/* if %i */
                      flags &= ~PFXOK;
                      /* We must reset the NZDIGITS and NDIGITS
                         flags that would have been unset by seeing
                         the zero that preceded the X or x.  */
                      flags |= NZDIGITS | NDIGITS;
                      goto ok;
                    }
                  break;
                }
 
              /*
               * If we got here, c is not a legal character
               * for a number.  Stop accumulating digits.
               */
              break;
            ok:
              /*
               * c is legal: store it and look at the next.
               */
              *p++ = c;
            skip:
              if (--fp->_r > 0)
                fp->_p++;
              else
              if (__srefill_r (rptr, fp))
                break;          /* EOF */
            }
          /*
           * If we had only a sign, it is no good; push back the sign.
           * If the number ends in `x', it was [sign] '0' 'x', so push back
           * the x and treat it as [sign] '0'.
           * Use of ungetc here and below assumes ASCII encoding; we are only
           * pushing back 7-bit characters, so casting to unsigned char is
           * not necessary.
           */
          if (flags & NDIGITS)
            {
              if (p > buf)
                _ungetc_r (rptr, *--p, fp); /* [-+xX] */
              if (p == buf)
                goto match_failure;
            }
          if ((flags & SUPPRESS) == 0)
            {
              u_long res;
 
              *p = 0;
              res = (*ccfn) (rptr, buf, (char **) NULL, base);
              if (flags & POINTER)
                {
                  void **vp = GET_ARG (N, ap, void **);
#ifndef _NO_LONGLONG
                  if (sizeof (uintptr_t) > sizeof (u_long))
                    {
                      u_long_long resll;
                      resll = _strtoull_r (rptr, buf, (char **) NULL, base);
                      *vp = (void *) (uintptr_t) resll;
                    }
                  else
#endif /* !_NO_LONGLONG */
                    *vp = (void *) (uintptr_t) res;
                }
#ifdef _WANT_IO_C99_FORMATS
              else if (flags & CHAR)
                {
                  cp = GET_ARG (N, ap, char *);
                  *cp = res;
                }
#endif
              else if (flags & SHORT)
                {
                  sp = GET_ARG (N, ap, short *);
                  *sp = res;
                }
              else if (flags & LONG)
                {
                  lp = GET_ARG (N, ap, long *);
                  *lp = res;
                }
#ifndef _NO_LONGLONG
              else if (flags & LONGDBL)
                {
                  u_long_long resll;
                  if (ccfn == _strtoul_r)
                    resll = _strtoull_r (rptr, buf, (char **) NULL, base);
                  else
                    resll = _strtoll_r (rptr, buf, (char **) NULL, base);
                  llp = GET_ARG (N, ap, long long*);
                  *llp = resll;
                }
#endif
              else
                {
                  ip = GET_ARG (N, ap, int *);
                  *ip = res;
                }
              nassigned++;
            }
          nread += p - buf + skips;
          break;
        }
#ifdef FLOATING_POINT
        case CT_FLOAT:
        {
          /* scan a floating point number as if by strtod */
          /* This code used to assume that the number of digits is reasonable.
             However, ANSI / ISO C makes no such stipulation; we have to get
             exact results even when there is an unreasonable amount of
             leading zeroes.  */
          long leading_zeroes = 0;
          long zeroes, exp_adjust;
          char *exp_start = NULL;
          unsigned width_left = 0;
          char nancount = 0;
          char infcount = 0;
#ifdef hardway
          if (width == 0 || width > sizeof (buf) - 1)
#else
          /* size_t is unsigned, hence this optimisation */
          if (width - 1 > sizeof (buf) - 2)
#endif
            {
              width_left = width - (sizeof (buf) - 1);
              width = sizeof (buf) - 1;
            }
          flags |= SIGNOK | NDIGITS | DPTOK | EXPOK;
          zeroes = 0;
          exp_adjust = 0;
          for (p = buf; width; )
            {
              c = *fp->_p;
              /*
               * This code mimicks the integer conversion
               * code, but is much simpler.
               */
              switch (c)
                {
                case '0':
                  if (flags & NDIGITS)
                    {
                      flags &= ~SIGNOK;
                      zeroes++;
                      if (width_left)
                        {
                          width_left--;
                          width++;
                        }
                      goto fskip;
                    }
                  /* Fall through.  */
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                case '8':
                case '9':
                  if (nancount + infcount == 0)
                    {
                      flags &= ~(SIGNOK | NDIGITS);
                      goto fok;
                    }
                  break;
 
                case '+':
                case '-':
                  if (flags & SIGNOK)
                    {
                      flags &= ~SIGNOK;
                      goto fok;
                    }
                  break;
                case 'n':
                case 'N':
                  if (nancount == 0
                      && (flags & (NDIGITS | DPTOK | EXPOK)) ==
                                  (NDIGITS | DPTOK | EXPOK))
                    {
                      flags &= ~(SIGNOK | DPTOK | EXPOK | NDIGITS);
                      nancount = 1;
                      goto fok;
                    }
                  if (nancount == 2)
                    {
                      nancount = 3;
                      goto fok;
                    }
                  if (infcount == 1 || infcount == 4)
                    {
                      infcount++;
                      goto fok;
                    }
                  break;
                case 'a':
                case 'A':
                  if (nancount == 1)
                    {
                      nancount = 2;
                      goto fok;
                    }
                  break;
                case 'i':
                case 'I':
                  if (infcount == 0
                      && (flags & (NDIGITS | DPTOK | EXPOK)) ==
                                  (NDIGITS | DPTOK | EXPOK))
                    {
                      flags &= ~(SIGNOK | DPTOK | EXPOK | NDIGITS);
                      infcount = 1;
                      goto fok;
                    }
                  if (infcount == 3 || infcount == 5)
                    {
                      infcount++;
                      goto fok;
                    }
                  break;
                case 'f':
                case 'F':
                  if (infcount == 2)
                    {
                      infcount = 3;
                      goto fok;
                    }
                  break;
                case 't':
                case 'T':
                  if (infcount == 6)
                    {
                      infcount = 7;
                      goto fok;
                    }
                  break;
                case 'y':
                case 'Y':
                  if (infcount == 7)
                    {
                      infcount = 8;
                      goto fok;
                    }
                  break;
                case '.':
                  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;
              if (--fp->_r > 0)
                fp->_p++;
              else
              if (__srefill_r (rptr, fp))
                break;          /* EOF */
            }
          if (zeroes)
            flags &= ~NDIGITS;
          /* We may have a 'N' or possibly even [sign] 'N' 'a' as the
             start of 'NaN', only to run out of chars before it was
             complete (or having encountered a non-matching char).  So
             check here if we have an outstanding nancount, and if so
             put back the chars we did swallow and treat as a failed
             match.
 
             FIXME - we still don't handle NAN([0xdigits]).  */
          if (nancount - 1U < 2U) /* nancount && nancount < 3 */
            {
              /* Newlib's ungetc works even if we called __srefill in
                 the middle of a partial parse, but POSIX does not
                 guarantee that in all implementations of ungetc.  */
              while (p > buf)
                {
                  _ungetc_r (rptr, *--p, fp); /* [-+nNaA] */
                  --nread;
                }
              goto match_failure;
            }
          /* Likewise for 'inf' and 'infinity'.  But be careful that
             'infinite' consumes only 3 characters, leaving the stream
             at the second 'i'.  */
          if (infcount - 1U < 7U) /* infcount && infcount < 8 */
            {
              if (infcount >= 3) /* valid 'inf', but short of 'infinity' */
                while (infcount-- > 3)
                  {
                    _ungetc_r (rptr, *--p, fp); /* [iInNtT] */
                    --nread;
                  }
              else
                {
                  while (p > buf)
                    {
                      _ungetc_r (rptr, *--p, fp); /* [-+iInN] */
                      --nread;
                    }
                  goto match_failure;
                }
            }
          /*
           * If no digits, might be missing exponent digits
           * (just give back the exponent) or might be missing
           * regular digits, but had sign and/or decimal point.
           */
          if (flags & NDIGITS)
            {
              if (flags & EXPOK)
                {
                  /* no digits at all */
                  while (p > buf)
                    {
                      _ungetc_r (rptr, *--p, fp); /* [-+.] */
                      --nread;
                    }
                  goto match_failure;
                }
              /* just a bad exponent (e and maybe sign) */
              c = *--p;
              --nread;
              if (c != 'e' && c != 'E')
                {
                  _ungetc_r (rptr, c, fp); /* [-+] */
                  c = *--p;
                  --nread;
                }
              _ungetc_r (rptr, c, fp); /* [eE] */
            }
          if ((flags & SUPPRESS) == 0)
            {
              double res = 0;
#ifdef _NO_LONGDBL
#define QUAD_RES res;
#else  /* !_NO_LONG_DBL */
              long double qres = 0;
#define QUAD_RES qres;
#endif /* !_NO_LONG_DBL */
              long new_exp = 0;
 
              *p = 0;
              if ((flags & (DPTOK | EXPOK)) == EXPOK)
                {
                  exp_adjust = zeroes - leading_zeroes;
                  new_exp = -exp_adjust;
                  exp_start = p;
                }
              else if (exp_adjust)
                new_exp = _strtol_r (rptr, (exp_start + 1), NULL, 10) - exp_adjust;
              if (exp_adjust)
                {
 
                  /* If there might not be enough space for the new exponent,
                     truncate some trailing digits to make room.  */
                  if (exp_start >= buf + sizeof (buf) - MAX_LONG_LEN)
                    exp_start = buf + sizeof (buf) - MAX_LONG_LEN - 1;
                 sprintf (exp_start, "e%ld", new_exp);
                }
 
              /* 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 = GET_ARG (N, ap, double *);
                  *dp = res;
                }
              else if (flags & LONGDBL)
                {
                  ldp = GET_ARG (N, ap, _LONG_DOUBLE *);
                  *ldp = QUAD_RES;
                }
              else
                {
                  flp = GET_ARG (N, ap, float *);
                  if (isnan (res))
                    *flp = nanf (NULL);
                  else
                    *flp = res;
                }
              nassigned++;
            }
          break;
        }
#endif /* FLOATING_POINT */
        }
    }
input_failure:
  /* On read failure, return EOF failure regardless of matches; errno
     should have been set prior to here.  On EOF failure (including
     invalid format string), return EOF if no matches yet, else number
     of matches made prior to failure.  */
  _funlockfile (fp);
  return nassigned && !(fp->_flags & __SERR) ? nassigned : EOF;
match_failure:
all_done:
  /* Return number of matches, which can be 0 on match failure.  */
  _funlockfile (fp);
  return nassigned;
}
 
#ifndef _NO_POS_ARGS
/* Process all intermediate arguments.  Fortunately, with scanf, all
   intermediate arguments are sizeof(void*), so we don't need to scan
   ahead in the format string.  */
static void *
get_arg (int n, va_list *ap, int *numargs_p, void **args)
{
  int numargs = *numargs_p;
  while (n >= numargs)
    args[numargs++] = va_arg (*ap, void *);
  *numargs_p = numargs;
  return args[n];
}
#endif /* !_NO_POS_ARGS */
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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [stdio/] [vfscanf.c] - Blame information for rev 171

Line No.	Rev	Author	Line
1	148	jeremybenn	`/*-`
2			`* Copyright (c) 1990 The Regents of the University of California.`
3			`* All rights reserved.`
4			`*`
5			`* Redistribution and use in source and binary forms are permitted`
6			`* provided that the above copyright notice and this paragraph are`
7			`* duplicated in all such forms and that any documentation,`
8			`* advertising materials, and other materials related to such`
9			`* distribution and use acknowledge that the software was developed`
10			`* by the University of California, Berkeley. The name of the`
11			`* University may not be used to endorse or promote products derived`
12			`* from this software without specific prior written permission.`
13			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14			`* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED`
15			`* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.`
16			`*/`
17
18			`/*`
19			`FUNCTION`
20			`<<vfscanf>>, <<vscanf>>, <<vsscanf>>---format argument list`
21
22			`INDEX`
23			`vfscanf`
24			`INDEX`
25			`_vfscanf_r`
26			`INDEX`
27			`vscanf`
28			`INDEX`
29			`_vscanf_r`
30			`INDEX`
31			`vsscanf`
32			`INDEX`
33			`_vsscanf_r`
34
35			`ANSI_SYNOPSIS`
36			`#include <stdio.h>`
37			`#include <stdarg.h>`
38			`int vscanf(const char *<[fmt]>, va_list <[list]>);`
39			`int vfscanf(FILE <[fp]>, const char <[fmt]>, va_list <[list]>);`
40			`int vsscanf(const char <[str]>, const char <[fmt]>, va_list <[list]>);`