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kolibrios/programs/develop/libraries/newlib/stdio/vfscanf.c
Sergey Semyonov (Serge) 0a3f4b2193 Newlib source code 
git-svn-id: svn://kolibrios.org@1693 a494cfbc-eb01-0410-851d-a64ba20cac60
2010-11-07 13:42:29 +00:00

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39 KiB
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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"
#include "../stdlib/local.h"
#ifdef INTEGER_ONLY
#define VFSCANF vfiscanf
#define _VFSCANF_R _vfiscanf_r
#define __SVFSCANF __svfiscanf
#ifdef STRING_ONLY
# define __SVFSCANF_R __ssvfiscanf_r
#else
# define __SVFSCANF_R __svfiscanf_r
#endif
#else
#define VFSCANF vfscanf
#define _VFSCANF_R _vfscanf_r
#define __SVFSCANF __svfscanf
#ifdef STRING_ONLY
# define __SVFSCANF_R __ssvfscanf_r
#else
# define __SVFSCANF_R __svfscanf_r
#endif
#ifndef NO_FLOATING_POINT
#define FLOATING_POINT
#endif
#endif
#ifdef STRING_ONLY
#undef _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 */
#if defined (STRING_ONLY) && defined (INTEGER_ONLY)
/* When dealing with the sscanf family, we don't want to use the
* regular ungetc which will drag in file I/O items we don't need.
* So, we create our own trimmed-down version. */
int
_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. */
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;
}
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;
}
#else /* !STRING_ONLY || !INTEGER_ONLY */
int _EXFUN (_sungetc_r, (struct _reent *, int, register FILE *));
int _EXFUN (__ssrefill_r, (struct _reent *, register FILE *));
size_t _EXFUN (_sfread_r, (struct _reent *, _PTR buf, size_t, size_t, FILE *));
#endif /* !STRING_ONLY || !INTEGER_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 */
unsigned char *lptr; /* literal pointer */
char *cp;
short *sp;
int *ip;
#ifdef FLOATING_POINT
float *flp;
_LONG_DOUBLE *ldp;
double *dp;
#endif
long *lp;
#ifndef _NO_LONGLONG
long long *llp;
#endif
/* `basefix' is used to avoid `if' tests in the integer scanner */
static _CONST short basefix[17] =
{10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
/* Macro to support positional arguments */
#ifndef _NO_POS_ARGS
# define GET_ARG(n, ap, type) \
((type) (is_pos_arg \
? (n < numargs \
? args[n] \
: get_arg (n, &ap, &numargs, args)) \
: (arg_index++ < numargs \
? args[n] \
: (numargs < MAX_POS_ARGS \
? args[numargs++] = va_arg (ap, void *) \
: va_arg (ap, void *)))))
#else
# define GET_ARG(n, ap, type) (va_arg (ap, type))
#endif
__sfp_lock_acquire ();
_flockfile (fp);
ORIENT (fp, -1);
nassigned = 0;
nread = 0;
#ifdef _MB_CAPABLE
memset (&state, 0, sizeof (state));
#endif
for (;;)
{
#ifndef _MB_CAPABLE
wc = *fmt;
#else
nbytes = __mbtowc (rptr, &wc, fmt, MB_CUR_MAX, __locale_charset (),
&state);
if (nbytes < 0) {
wc = 0xFFFD; /* Unicode replacement character */
nbytes = 1;
memset (&state, 0, sizeof (state));
}
#endif
fmt += nbytes;
if (wc == 0)
goto all_done;
if (nbytes == 1 && isspace (wc))
{
for (;;)
{
if (BufferEmpty || !isspace (*fp->_p))
break;
nread++, fp->_r--, fp->_p++;
}
continue;
}
if (wc != '%')
goto literal;
width = 0;
flags = 0;
#ifndef _NO_POS_ARGS
N = arg_index;
is_pos_arg = 0;
#endif
/*
* switch on the format. continue if done; break once format
* type is derived.
*/
again:
c = *fmt++;
switch (c)
{
case '%':
literal:
lptr = fmt - nbytes;
for (n = 0; n < nbytes; ++n)
{
if (BufferEmpty)
goto input_failure;
if (*fp->_p != *lptr)
goto match_failure;
fp->_r--, fp->_p++;
nread++;
++lptr;
}
continue;
case '*':
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 = (u_char *) __sccl (ccltab, (unsigned char *) fmt);
flags |= NOSKIP;
c = CT_CCL;
break;
#ifdef _WANT_IO_C99_FORMATS
case 'C':
flags |= LONG;
/* FALLTHROUGH */
#endif
case 'c':
flags |= NOSKIP;
c = CT_CHAR;
break;
case 'p': /* pointer format is like hex */
flags |= POINTER | PFXOK;
c = CT_INT;
ccfn = _strtoul_r;
base = 16;
break;
case 'n':
if (flags & SUPPRESS) /* ??? */
continue;
#ifdef _WANT_IO_C99_FORMATS
if (flags & CHAR)
{
cp = GET_ARG (N, ap, char *);
*cp = nread;
}
else
#endif
if (flags & SHORT)
{
sp = GET_ARG (N, ap, short *);
*sp = nread;
}
else if (flags & LONG)
{
lp = GET_ARG (N, ap, long *);
*lp = nread;
}
#ifndef _NO_LONGLONG
else if (flags & LONGDBL)
{
llp = GET_ARG (N, ap, long long*);
*llp = nread;
}
#endif
else
{
ip = GET_ARG (N, ap, int *);
*ip = nread;
}
continue;
/*
* Disgusting backwards compatibility hacks. XXX
*/
case '\0': /* compat */
_funlockfile (fp);
__sfp_lock_release ();
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)
{
mbstate_t state;
memset (&state, 0, sizeof (mbstate_t));
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;
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 */
mbstate_t state;
memset (&state, 0, sizeof (mbstate_t));
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;
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 && zeroes == 0
&& (flags & (NDIGITS | DPTOK | EXPOK)) ==
(NDIGITS | DPTOK | EXPOK))
{
flags &= ~(SIGNOK | DPTOK | EXPOK | NDIGITS);
nancount = 1;
goto fok;
}
if (nancount == 2)
{
nancount = 3;
goto fok;
}
if (infcount == 1 || infcount == 4)
{
infcount++;
goto fok;
}
break;
case 'a':
case 'A':
if (nancount == 1)
{
nancount = 2;
goto fok;
}
break;
case 'i':
case 'I':
if (infcount == 0 && zeroes == 0
&& (flags & (NDIGITS | DPTOK | EXPOK)) ==
(NDIGITS | DPTOK | EXPOK))
{
flags &= ~(SIGNOK | DPTOK | EXPOK | NDIGITS);
infcount = 1;
goto fok;
}
if (infcount == 3 || infcount == 5)
{
infcount++;
goto fok;
}
break;
case 'f':
case 'F':
if (infcount == 2)
{
infcount = 3;
goto fok;
}
break;
case 't':
case 'T':
if (infcount == 6)
{
infcount = 7;
goto fok;
}
break;
case 'y':
case 'Y':
if (infcount == 7)
{
infcount = 8;
goto fok;
}
break;
case '.':
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);
__sfp_lock_release ();
return nassigned && !(fp->_flags & __SERR) ? nassigned : EOF;
match_failure:
all_done:
/* Return number of matches, which can be 0 on match failure. */
_funlockfile (fp);
__sfp_lock_release ();
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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