0,0 → 1,1620 |
/*- |
* 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 */ |
#ifdef _MB_CAPABLE |
mbstate_t state; /* value to keep track of multibyte state */ |
#endif |
|
#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 |
|
_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); |
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); |
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 */ |