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glibc/stdio-common/vfscanf.c

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/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
#include <libc-internal.h>
#include <libc-lock.h>
#include <locale/localeinfo.h>
#include <scratch_buffer.h>
#ifdef __GNUC__
# define HAVE_LONGLONG
# define LONGLONG long long
#else
# define LONGLONG long
#endif
/* Determine whether we have to handle `long long' at all. */
#if LONG_MAX == LONG_LONG_MAX
# define need_longlong 0
#else
# define need_longlong 1
#endif
/* Determine whether we have to handle `long'. */
#if INT_MAX == LONG_MAX
# define need_long 0
#else
# define need_long 1
#endif
/* Those are flags in the conversion format. */
#define LONG 0x0001 /* l: long or double */
#define LONGDBL 0x0002 /* L: long long or long double */
#define SHORT 0x0004 /* h: short */
#define SUPPRESS 0x0008 /* *: suppress assignment */
#define POINTER 0x0010 /* weird %p pointer (`fake hex') */
#define NOSKIP 0x0020 /* do not skip blanks */
#define NUMBER_SIGNED 0x0040 /* signed integer */
#define GROUP 0x0080 /* ': group numbers */
#define GNU_MALLOC 0x0100 /* a: malloc strings */
#define CHAR 0x0200 /* hh: char */
#define I18N 0x0400 /* I: use locale's digits */
#define HEXA_FLOAT 0x0800 /* hexadecimal float */
#define READ_POINTER 0x1000 /* this is a pointer value */
#define POSIX_MALLOC 0x2000 /* m: malloc strings */
#define MALLOC (GNU_MALLOC | POSIX_MALLOC)
#include <locale/localeinfo.h>
#include <libioP.h>
#include <libio.h>
#undef va_list
#define va_list _IO_va_list
#ifdef COMPILE_WSCANF
# define ungetc(c, s) ((void) (c == WEOF \
|| (--read_in, \
_IO_sputbackwc (s, c))))
# define ungetc_not_eof(c, s) ((void) (--read_in, \
_IO_sputbackwc (s, c)))
# define inchar() (c == WEOF ? ((errno = inchar_errno), WEOF) \
: ((c = _IO_getwc_unlocked (s)), \
(void) (c != WEOF \
? ++read_in \
: (size_t) (inchar_errno = errno)), c))
# define ISSPACE(Ch) iswspace (Ch)
# define ISDIGIT(Ch) iswdigit (Ch)
# define ISXDIGIT(Ch) iswxdigit (Ch)
# define TOLOWER(Ch) towlower (Ch)
# define ORIENT if (_IO_fwide (s, 1) != 1) return WEOF
# define __strtoll_internal __wcstoll_internal
# define __strtoull_internal __wcstoull_internal
# define __strtol_internal __wcstol_internal
# define __strtoul_internal __wcstoul_internal
# define __strtold_internal __wcstold_internal
# define __strtod_internal __wcstod_internal
# define __strtof_internal __wcstof_internal
# define L_(Str) L##Str
# define CHAR_T wchar_t
# define UCHAR_T unsigned int
# define WINT_T wint_t
# undef EOF
# define EOF WEOF
#else
# define ungetc(c, s) ((void) ((int) c == EOF \
|| (--read_in, \
_IO_sputbackc (s, (unsigned char) c))))
# define ungetc_not_eof(c, s) ((void) (--read_in, \
_IO_sputbackc (s, (unsigned char) c)))
# define inchar() (c == EOF ? ((errno = inchar_errno), EOF) \
: ((c = _IO_getc_unlocked (s)), \
(void) (c != EOF \
? ++read_in \
: (size_t) (inchar_errno = errno)), c))
# define ISSPACE(Ch) __isspace_l (Ch, loc)
# define ISDIGIT(Ch) __isdigit_l (Ch, loc)
# define ISXDIGIT(Ch) __isxdigit_l (Ch, loc)
# define TOLOWER(Ch) __tolower_l ((unsigned char) (Ch), loc)
# define ORIENT if (_IO_vtable_offset (s) == 0 \
&& _IO_fwide (s, -1) != -1) \
return EOF
# define L_(Str) Str
# define CHAR_T char
# define UCHAR_T unsigned char
# define WINT_T int
#endif
#include "printf-parse.h" /* Use read_int. */
#define encode_error() do { \
errval = 4; \
__set_errno (EILSEQ); \
goto errout; \
} while (0)
#define conv_error() do { \
errval = 2; \
goto errout; \
} while (0)
#define input_error() do { \
errval = 1; \
if (done == 0) done = EOF; \
goto errout; \
} while (0)
#define add_ptr_to_free(ptr) \
do \
{ \
if (ptrs_to_free == NULL \
|| ptrs_to_free->count == (sizeof (ptrs_to_free->ptrs) \
/ sizeof (ptrs_to_free->ptrs[0]))) \
{ \
struct ptrs_to_free *new_ptrs = alloca (sizeof (*ptrs_to_free)); \
new_ptrs->count = 0; \
new_ptrs->next = ptrs_to_free; \
ptrs_to_free = new_ptrs; \
} \
ptrs_to_free->ptrs[ptrs_to_free->count++] = (ptr); \
} \
while (0)
#define ARGCHECK(s, format) \
do \
{ \
/* Check file argument for consistence. */ \
CHECK_FILE (s, EOF); \
if (s->_flags & _IO_NO_READS) \
{ \
__set_errno (EBADF); \
return EOF; \
} \
else if (format == NULL) \
{ \
MAYBE_SET_EINVAL; \
return EOF; \
} \
} while (0)
#define LOCK_STREAM(S) \
__libc_cleanup_region_start (1, (void (*) (void *)) &_IO_funlockfile, (S)); \
_IO_flockfile (S)
#define UNLOCK_STREAM(S) \
_IO_funlockfile (S); \
__libc_cleanup_region_end (0)
struct ptrs_to_free
{
size_t count;
struct ptrs_to_free *next;
char **ptrs[32];
};
struct char_buffer {
CHAR_T *current;
CHAR_T *end;
struct scratch_buffer scratch;
};
/* Returns a pointer to the first CHAR_T object in the buffer. Only
valid if char_buffer_add (BUFFER, CH) has been called and
char_buffer_error (BUFFER) is false. */
static inline CHAR_T *
char_buffer_start (const struct char_buffer *buffer)
{
return (CHAR_T *) buffer->scratch.data;
}
/* Returns the number of CHAR_T objects in the buffer. Only valid if
char_buffer_error (BUFFER) is false. */
static inline size_t
char_buffer_size (const struct char_buffer *buffer)
{
return buffer->current - char_buffer_start (buffer);
}
/* Reinitializes BUFFER->current and BUFFER->end to cover the entire
scratch buffer. */
static inline void
char_buffer_rewind (struct char_buffer *buffer)
{
buffer->current = char_buffer_start (buffer);
buffer->end = buffer->current + buffer->scratch.length / sizeof (CHAR_T);
}
/* Returns true if a previous call to char_buffer_add (BUFFER, CH)
failed. */
static inline bool
char_buffer_error (const struct char_buffer *buffer)
{
return __glibc_unlikely (buffer->current == NULL);
}
/* Slow path for char_buffer_add. */
static void
char_buffer_add_slow (struct char_buffer *buffer, CHAR_T ch)
{
if (char_buffer_error (buffer))
return;
size_t offset = buffer->end - (CHAR_T *) buffer->scratch.data;
if (!scratch_buffer_grow_preserve (&buffer->scratch))
{
buffer->current = NULL;
buffer->end = NULL;
return;
}
char_buffer_rewind (buffer);
buffer->current += offset;
*buffer->current++ = ch;
}
/* Adds CH to BUFFER. This function does not report any errors, check
for them with char_buffer_error. */
static inline void
char_buffer_add (struct char_buffer *buffer, CHAR_T ch)
__attribute__ ((always_inline));
static inline void
char_buffer_add (struct char_buffer *buffer, CHAR_T ch)
{
if (__glibc_unlikely (buffer->current == buffer->end))
char_buffer_add_slow (buffer, ch);
else
*buffer->current++ = ch;
}
/* Read formatted input from S according to the format string
FORMAT, using the argument list in ARG.
Return the number of assignments made, or -1 for an input error. */
#ifdef COMPILE_WSCANF
int
_IO_vfwscanf (_IO_FILE *s, const wchar_t *format, _IO_va_list argptr,
int *errp)
#else
int
_IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr,
int *errp)
#endif
{
va_list arg;
const CHAR_T *f = format;
UCHAR_T fc; /* Current character of the format. */
WINT_T done = 0; /* Assignments done. */
size_t read_in = 0; /* Chars read in. */
WINT_T c = 0; /* Last char read. */
int width; /* Maximum field width. */
int flags; /* Modifiers for current format element. */
int errval = 0;
#ifndef COMPILE_WSCANF
__locale_t loc = _NL_CURRENT_LOCALE;
struct __locale_data *const curctype = loc->__locales[LC_CTYPE];
#endif
/* Errno of last failed inchar call. */
int inchar_errno = 0;
/* Status for reading F-P nums. */
char got_digit, got_dot, got_e, negative;
/* If a [...] is a [^...]. */
CHAR_T not_in;
#define exp_char not_in
/* Base for integral numbers. */
int base;
/* Decimal point character. */
#ifdef COMPILE_WSCANF
wint_t decimal;
#else
const char *decimal;
#endif
/* The thousands character of the current locale. */
#ifdef COMPILE_WSCANF
wint_t thousands;
#else
const char *thousands;
#endif
struct ptrs_to_free *ptrs_to_free = NULL;
/* State for the conversions. */
mbstate_t state;
/* Integral holding variables. */
union
{
long long int q;
unsigned long long int uq;
long int l;
unsigned long int ul;
} num;
/* Character-buffer pointer. */
char *str = NULL;
wchar_t *wstr = NULL;
char **strptr = NULL;
ssize_t strsize = 0;
/* We must not react on white spaces immediately because they can
possibly be matched even if in the input stream no character is
available anymore. */
int skip_space = 0;
/* Workspace. */
CHAR_T *tw; /* Temporary pointer. */
struct char_buffer charbuf;
scratch_buffer_init (&charbuf.scratch);
#ifdef __va_copy
__va_copy (arg, argptr);
#else
arg = (va_list) argptr;
#endif
#ifdef ORIENT
ORIENT;
#endif
ARGCHECK (s, format);
{
#ifndef COMPILE_WSCANF
struct __locale_data *const curnumeric = loc->__locales[LC_NUMERIC];
#endif
/* Figure out the decimal point character. */
#ifdef COMPILE_WSCANF
decimal = _NL_CURRENT_WORD (LC_NUMERIC, _NL_NUMERIC_DECIMAL_POINT_WC);
#else
decimal = curnumeric->values[_NL_ITEM_INDEX (DECIMAL_POINT)].string;
#endif
/* Figure out the thousands separator character. */
#ifdef COMPILE_WSCANF
thousands = _NL_CURRENT_WORD (LC_NUMERIC, _NL_NUMERIC_THOUSANDS_SEP_WC);
#else
thousands = curnumeric->values[_NL_ITEM_INDEX (THOUSANDS_SEP)].string;
if (*thousands == '\0')
thousands = NULL;
#endif
}
/* Lock the stream. */
LOCK_STREAM (s);
#ifndef COMPILE_WSCANF
/* From now on we use `state' to convert the format string. */
memset (&state, '\0', sizeof (state));
#endif
/* Run through the format string. */
while (*f != '\0')
{
unsigned int argpos;
/* Extract the next argument, which is of type TYPE.
For a %N$... spec, this is the Nth argument from the beginning;
otherwise it is the next argument after the state now in ARG. */
#ifdef __va_copy
# define ARG(type) (argpos == 0 ? va_arg (arg, type) : \
({ unsigned int pos = argpos; \
va_list arg; \
__va_copy (arg, argptr); \
while (--pos > 0) \
(void) va_arg (arg, void *); \
va_arg (arg, type); \
}))
#else
# if 0
/* XXX Possible optimization. */
# define ARG(type) (argpos == 0 ? va_arg (arg, type) : \
({ va_list arg = (va_list) argptr; \
arg = (va_list) ((char *) arg \
+ (argpos - 1) \
* __va_rounded_size (void *)); \
va_arg (arg, type); \
}))
# else
# define ARG(type) (argpos == 0 ? va_arg (arg, type) : \
({ unsigned int pos = argpos; \
va_list arg = (va_list) argptr; \
while (--pos > 0) \
(void) va_arg (arg, void *); \
va_arg (arg, type); \
}))
# endif
#endif
#ifndef COMPILE_WSCANF
if (!isascii ((unsigned char) *f))
{
/* Non-ASCII, may be a multibyte. */
int len = __mbrlen (f, strlen (f), &state);
if (len > 0)
{
do
{
c = inchar ();
if (__glibc_unlikely (c == EOF))
input_error ();
else if (c != (unsigned char) *f++)
{
ungetc_not_eof (c, s);
conv_error ();
}
}
while (--len > 0);
continue;
}
}
#endif
fc = *f++;
if (fc != '%')
{
/* Remember to skip spaces. */
if (ISSPACE (fc))
{
skip_space = 1;
continue;
}
/* Read a character. */
c = inchar ();
/* Characters other than format specs must just match. */
if (__glibc_unlikely (c == EOF))
input_error ();
/* We saw white space char as the last character in the format
string. Now it's time to skip all leading white space. */
if (skip_space)
{
while (ISSPACE (c))
if (__glibc_unlikely (inchar () == EOF))
input_error ();
skip_space = 0;
}
if (__glibc_unlikely (c != fc))
{
ungetc (c, s);
conv_error ();
}
continue;
}
/* This is the start of the conversion string. */
flags = 0;
/* Initialize state of modifiers. */
argpos = 0;
/* Prepare temporary buffer. */
char_buffer_rewind (&charbuf);
/* Check for a positional parameter specification. */
if (ISDIGIT ((UCHAR_T) *f))
{
argpos = read_int ((const UCHAR_T **) &f);
if (*f == L_('$'))
++f;
else
{
/* Oops; that was actually the field width. */
width = argpos;
argpos = 0;
goto got_width;
}
}
/* Check for the assignment-suppressing, the number grouping flag,
and the signal to use the locale's digit representation. */
while (*f == L_('*') || *f == L_('\'') || *f == L_('I'))
switch (*f++)
{
case L_('*'):
flags |= SUPPRESS;
break;
case L_('\''):
#ifdef COMPILE_WSCANF
if (thousands != L'\0')
#else
if (thousands != NULL)
#endif
flags |= GROUP;
break;
case L_('I'):
flags |= I18N;
break;
}
/* Find the maximum field width. */
width = 0;
if (ISDIGIT ((UCHAR_T) *f))
width = read_int ((const UCHAR_T **) &f);
got_width:
if (width == 0)
width = -1;
/* Check for type modifiers. */
switch (*f++)
{
case L_('h'):
/* ints are short ints or chars. */
if (*f == L_('h'))
{
++f;
flags |= CHAR;
}
else
flags |= SHORT;
break;
case L_('l'):
if (*f == L_('l'))
{
/* A double `l' is equivalent to an `L'. */
++f;
flags |= LONGDBL | LONG;
}
else
/* ints are long ints. */
flags |= LONG;
break;
case L_('q'):
case L_('L'):
/* doubles are long doubles, and ints are long long ints. */
flags |= LONGDBL | LONG;
break;
case L_('a'):
/* The `a' is used as a flag only if followed by `s', `S' or
`['. */
if (*f != L_('s') && *f != L_('S') && *f != L_('['))
{
--f;
break;
}
/* In __isoc99_*scanf %as, %aS and %a[ extension is not
supported at all. */
if (s->_flags2 & _IO_FLAGS2_SCANF_STD)
{
--f;
break;
}
/* String conversions (%s, %[) take a `char **'
arg and fill it in with a malloc'd pointer. */
flags |= GNU_MALLOC;
break;
case L_('m'):
flags |= POSIX_MALLOC;
if (*f == L_('l'))
{
++f;
flags |= LONG;
}
break;
case L_('z'):
if (need_longlong && sizeof (size_t) > sizeof (unsigned long int))
flags |= LONGDBL;
else if (sizeof (size_t) > sizeof (unsigned int))
flags |= LONG;
break;
case L_('j'):
if (need_longlong && sizeof (uintmax_t) > sizeof (unsigned long int))
flags |= LONGDBL;
else if (sizeof (uintmax_t) > sizeof (unsigned int))
flags |= LONG;
break;
case L_('t'):
if (need_longlong && sizeof (ptrdiff_t) > sizeof (long int))
flags |= LONGDBL;
else if (sizeof (ptrdiff_t) > sizeof (int))
flags |= LONG;
break;
default:
/* Not a recognized modifier. Backup. */
--f;
break;
}
/* End of the format string? */
if (__glibc_unlikely (*f == L_('\0')))
conv_error ();
/* Find the conversion specifier. */
fc = *f++;
if (skip_space || (fc != L_('[') && fc != L_('c')
&& fc != L_('C') && fc != L_('n')))
{
/* Eat whitespace. */
int save_errno = errno;
__set_errno (0);
do
/* We add the additional test for EOF here since otherwise
inchar will restore the old errno value which might be
EINTR but does not indicate an interrupt since nothing
was read at this time. */
if (__builtin_expect ((c == EOF || inchar () == EOF)
&& errno == EINTR, 0))
input_error ();
while (ISSPACE (c));
__set_errno (save_errno);
ungetc (c, s);
skip_space = 0;
}
switch (fc)
{
case L_('%'): /* Must match a literal '%'. */
c = inchar ();
if (__glibc_unlikely (c == EOF))
input_error ();
if (__glibc_unlikely (c != fc))
{
ungetc_not_eof (c, s);
conv_error ();
}
break;
case L_('n'): /* Answer number of assignments done. */
/* Corrigendum 1 to ISO C 1990 describes the allowed flags
with the 'n' conversion specifier. */
if (!(flags & SUPPRESS))
{
/* Don't count the read-ahead. */
if (need_longlong && (flags & LONGDBL))
*ARG (long long int *) = read_in;
else if (need_long && (flags & LONG))
*ARG (long int *) = read_in;
else if (flags & SHORT)
*ARG (short int *) = read_in;
else if (!(flags & CHAR))
*ARG (int *) = read_in;
else
*ARG (char *) = read_in;
#ifdef NO_BUG_IN_ISO_C_CORRIGENDUM_1
/* We have a severe problem here. The ISO C standard
contradicts itself in explaining the effect of the %n
format in `scanf'. While in ISO C:1990 and the ISO C
Amendement 1:1995 the result is described as
Execution of a %n directive does not effect the
assignment count returned at the completion of
execution of the f(w)scanf function.
in ISO C Corrigendum 1:1994 the following was added:
Subclause 7.9.6.2
Add the following fourth example:
In:
#include <stdio.h>
int d1, d2, n1, n2, i;
i = sscanf("123", "%d%n%n%d", &d1, &n1, &n2, &d2);
the value 123 is assigned to d1 and the value3 to n1.
Because %n can never get an input failure the value
of 3 is also assigned to n2. The value of d2 is not
affected. The value 3 is assigned to i.
We go for now with the historically correct code from ISO C,
i.e., we don't count the %n assignments. When it ever
should proof to be wrong just remove the #ifdef above. */
++done;
#endif
}
break;
case L_('c'): /* Match characters. */
if ((flags & LONG) == 0)
{
if (width == -1)
width = 1;
#define STRING_ARG(Str, Type, Width) \
do if (!(flags & SUPPRESS)) \
{ \
if (flags & MALLOC) \
{ \
/* The string is to be stored in a malloc'd buffer. */ \
/* For %mS using char ** is actually wrong, but \
shouldn't make a difference on any arch glibc \
supports and would unnecessarily complicate \
things. */ \
strptr = ARG (char **); \
if (strptr == NULL) \
conv_error (); \
/* Allocate an initial buffer. */ \
strsize = Width; \
*strptr = (char *) malloc (strsize * sizeof (Type)); \
Str = (Type *) *strptr; \
if (Str != NULL) \
add_ptr_to_free (strptr); \
else if (flags & POSIX_MALLOC) \
{ \
done = EOF; \
goto errout; \
} \
} \
else \
Str = ARG (Type *); \
if (Str == NULL) \
conv_error (); \
} while (0)
#ifdef COMPILE_WSCANF
STRING_ARG (str, char, 100);
#else
STRING_ARG (str, char, (width > 1024 ? 1024 : width));
#endif
c = inchar ();
if (__glibc_unlikely (c == EOF))
input_error ();
#ifdef COMPILE_WSCANF
/* We have to convert the wide character(s) into multibyte
characters and store the result. */
memset (&state, '\0', sizeof (state));
do
{
size_t n;
if (!(flags & SUPPRESS) && (flags & POSIX_MALLOC)
&& *strptr + strsize - str <= MB_LEN_MAX)
{
/* We have to enlarge the buffer if the `m' flag
was given. */
size_t strleng = str - *strptr;
char *newstr;
newstr = (char *) realloc (*strptr, strsize * 2);
if (newstr == NULL)
{
/* Can't allocate that much. Last-ditch effort. */
newstr = (char *) realloc (*strptr,
strleng + MB_LEN_MAX);
if (newstr == NULL)
{
/* c can't have `a' flag, only `m'. */
done = EOF;
goto errout;
}
else
{
*strptr = newstr;
str = newstr + strleng;
strsize = strleng + MB_LEN_MAX;
}
}
else
{
*strptr = newstr;
str = newstr + strleng;
strsize *= 2;
}
}
n = __wcrtomb (!(flags & SUPPRESS) ? str : NULL, c, &state);
if (__glibc_unlikely (n == (size_t) -1))
/* No valid wide character. */
input_error ();
/* Increment the output pointer. Even if we don't
write anything. */
str += n;
}
while (--width > 0 && inchar () != EOF);
#else
if (!(flags & SUPPRESS))
{
do
{
if ((flags & MALLOC)
&& (char *) str == *strptr + strsize)
{
/* Enlarge the buffer. */
size_t newsize
= strsize
+ (strsize >= width ? width - 1 : strsize);
str = (char *) realloc (*strptr, newsize);
if (str == NULL)
{
/* Can't allocate that much. Last-ditch
effort. */
str = (char *) realloc (*strptr, strsize + 1);
if (str == NULL)
{
/* c can't have `a' flag, only `m'. */
done = EOF;
goto errout;
}
else
{
*strptr = (char *) str;
str += strsize;
++strsize;
}
}
else
{
*strptr = (char *) str;
str += strsize;
strsize = newsize;
}
}
*str++ = c;
}
while (--width > 0 && inchar () != EOF);
}
else
while (--width > 0 && inchar () != EOF);
#endif
if (!(flags & SUPPRESS))
{
if ((flags & MALLOC) && str - *strptr != strsize)
{
char *cp = (char *) realloc (*strptr, str - *strptr);
if (cp != NULL)
*strptr = cp;
}
strptr = NULL;
++done;
}
break;
}
/* FALLTHROUGH */
case L_('C'):
if (width == -1)
width = 1;
STRING_ARG (wstr, wchar_t, (width > 1024 ? 1024 : width));
c = inchar ();
if (__glibc_unlikely (c == EOF))
input_error ();
#ifdef COMPILE_WSCANF
/* Just store the incoming wide characters. */
if (!(flags & SUPPRESS))
{
do
{
if ((flags & MALLOC)
&& wstr == (wchar_t *) *strptr + strsize)
{
size_t newsize
= strsize + (strsize > width ? width - 1 : strsize);
/* Enlarge the buffer. */
wstr = (wchar_t *) realloc (*strptr,
newsize * sizeof (wchar_t));
if (wstr == NULL)
{
/* Can't allocate that much. Last-ditch effort. */
wstr = (wchar_t *) realloc (*strptr,
(strsize + 1)
* sizeof (wchar_t));
if (wstr == NULL)
{
/* C or lc can't have `a' flag, only `m'
flag. */
done = EOF;
goto errout;
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
++strsize;
}
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
strsize = newsize;
}
}
*wstr++ = c;
}
while (--width > 0 && inchar () != EOF);
}
else
while (--width > 0 && inchar () != EOF);
#else
{
/* We have to convert the multibyte input sequence to wide
characters. */
char buf[1];
mbstate_t cstate;
memset (&cstate, '\0', sizeof (cstate));
do
{
/* This is what we present the mbrtowc function first. */
buf[0] = c;
if (!(flags & SUPPRESS) && (flags & MALLOC)
&& wstr == (wchar_t *) *strptr + strsize)
{
size_t newsize
= strsize + (strsize > width ? width - 1 : strsize);
/* Enlarge the buffer. */
wstr = (wchar_t *) realloc (*strptr,
newsize * sizeof (wchar_t));
if (wstr == NULL)
{
/* Can't allocate that much. Last-ditch effort. */
wstr = (wchar_t *) realloc (*strptr,
((strsize + 1)
* sizeof (wchar_t)));
if (wstr == NULL)
{
/* C or lc can't have `a' flag, only `m' flag. */
done = EOF;
goto errout;
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
++strsize;
}
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
strsize = newsize;
}
}
while (1)
{
size_t n;
n = __mbrtowc (!(flags & SUPPRESS) ? wstr : NULL,
buf, 1, &cstate);
if (n == (size_t) -2)
{
/* Possibly correct character, just not enough
input. */
if (__glibc_unlikely (inchar () == EOF))
encode_error ();
buf[0] = c;
continue;
}
if (__glibc_unlikely (n != 1))
encode_error ();
/* We have a match. */
break;
}
/* Advance the result pointer. */
++wstr;
}
while (--width > 0 && inchar () != EOF);
}
#endif
if (!(flags & SUPPRESS))
{
if ((flags & MALLOC) && wstr - (wchar_t *) *strptr != strsize)
{
wchar_t *cp = (wchar_t *) realloc (*strptr,
((wstr
- (wchar_t *) *strptr)
* sizeof (wchar_t)));
if (cp != NULL)
*strptr = (char *) cp;
}
strptr = NULL;
++done;
}
break;
case L_('s'): /* Read a string. */
if (!(flags & LONG))
{
STRING_ARG (str, char, 100);
c = inchar ();
if (__glibc_unlikely (c == EOF))
input_error ();
#ifdef COMPILE_WSCANF
memset (&state, '\0', sizeof (state));
#endif
do
{
if (ISSPACE (c))
{
ungetc_not_eof (c, s);
break;
}
#ifdef COMPILE_WSCANF
/* This is quite complicated. We have to convert the
wide characters into multibyte characters and then
store them. */
{
size_t n;
if (!(flags & SUPPRESS) && (flags & MALLOC)
&& *strptr + strsize - str <= MB_LEN_MAX)
{
/* We have to enlarge the buffer if the `a' or `m'
flag was given. */
size_t strleng = str - *strptr;
char *newstr;
newstr = (char *) realloc (*strptr, strsize * 2);
if (newstr == NULL)
{
/* Can't allocate that much. Last-ditch
effort. */
newstr = (char *) realloc (*strptr,
strleng + MB_LEN_MAX);
if (newstr == NULL)
{
if (flags & POSIX_MALLOC)
{
done = EOF;
goto errout;
}
/* We lose. Oh well. Terminate the
string and stop converting,
so at least we don't skip any input. */
((char *) (*strptr))[strleng] = '\0';
strptr = NULL;
++done;
conv_error ();
}
else
{
*strptr = newstr;
str = newstr + strleng;
strsize = strleng + MB_LEN_MAX;
}
}
else
{
*strptr = newstr;
str = newstr + strleng;
strsize *= 2;
}
}
n = __wcrtomb (!(flags & SUPPRESS) ? str : NULL, c,
&state);
if (__glibc_unlikely (n == (size_t) -1))
encode_error ();
assert (n <= MB_LEN_MAX);
str += n;
}
#else
/* This is easy. */
if (!(flags & SUPPRESS))
{
*str++ = c;
if ((flags & MALLOC)
&& (char *) str == *strptr + strsize)
{
/* Enlarge the buffer. */
str = (char *) realloc (*strptr, 2 * strsize);
if (str == NULL)
{
/* Can't allocate that much. Last-ditch
effort. */
str = (char *) realloc (*strptr, strsize + 1);
if (str == NULL)
{
if (flags & POSIX_MALLOC)
{
done = EOF;
goto errout;
}
/* We lose. Oh well. Terminate the
string and stop converting,
so at least we don't skip any input. */
((char *) (*strptr))[strsize - 1] = '\0';
strptr = NULL;
++done;
conv_error ();
}
else
{
*strptr = (char *) str;
str += strsize;
++strsize;
}
}
else
{
*strptr = (char *) str;
str += strsize;
strsize *= 2;
}
}
}
#endif
}
while ((width <= 0 || --width > 0) && inchar () != EOF);
if (!(flags & SUPPRESS))
{
#ifdef COMPILE_WSCANF
/* We have to emit the code to get into the initial
state. */
char buf[MB_LEN_MAX];
size_t n = __wcrtomb (buf, L'\0', &state);
if (n > 0 && (flags & MALLOC)
&& str + n >= *strptr + strsize)
{
/* Enlarge the buffer. */
size_t strleng = str - *strptr;
char *newstr;
newstr = (char *) realloc (*strptr, strleng + n + 1);
if (newstr == NULL)
{
if (flags & POSIX_MALLOC)
{
done = EOF;
goto errout;
}
/* We lose. Oh well. Terminate the string
and stop converting, so at least we don't
skip any input. */
((char *) (*strptr))[strleng] = '\0';
strptr = NULL;
++done;
conv_error ();
}
else
{
*strptr = newstr;
str = newstr + strleng;
strsize = strleng + n + 1;
}
}
str = __mempcpy (str, buf, n);
#endif
*str++ = '\0';
if ((flags & MALLOC) && str - *strptr != strsize)
{
char *cp = (char *) realloc (*strptr, str - *strptr);
if (cp != NULL)
*strptr = cp;
}
strptr = NULL;
++done;
}
break;
}
/* FALLTHROUGH */
case L_('S'):
{
#ifndef COMPILE_WSCANF
mbstate_t cstate;
#endif
/* Wide character string. */
STRING_ARG (wstr, wchar_t, 100);
c = inchar ();
if (__builtin_expect (c == EOF, 0))
input_error ();
#ifndef COMPILE_WSCANF
memset (&cstate, '\0', sizeof (cstate));
#endif
do
{
if (ISSPACE (c))
{
ungetc_not_eof (c, s);
break;
}
#ifdef COMPILE_WSCANF
/* This is easy. */
if (!(flags & SUPPRESS))
{
*wstr++ = c;
if ((flags & MALLOC)
&& wstr == (wchar_t *) *strptr + strsize)
{
/* Enlarge the buffer. */
wstr = (wchar_t *) realloc (*strptr,
(2 * strsize)
* sizeof (wchar_t));
if (wstr == NULL)
{
/* Can't allocate that much. Last-ditch
effort. */
wstr = (wchar_t *) realloc (*strptr,
(strsize + 1)
* sizeof (wchar_t));
if (wstr == NULL)
{
if (flags & POSIX_MALLOC)
{
done = EOF;
goto errout;
}
/* We lose. Oh well. Terminate the string
and stop converting, so at least we don't
skip any input. */
((wchar_t *) (*strptr))[strsize - 1] = L'\0';
strptr = NULL;
++done;
conv_error ();
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
++strsize;
}
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
strsize *= 2;
}
}
}
#else
{
char buf[1];
buf[0] = c;
while (1)
{
size_t n;
n = __mbrtowc (!(flags & SUPPRESS) ? wstr : NULL,
buf, 1, &cstate);
if (n == (size_t) -2)
{
/* Possibly correct character, just not enough
input. */
if (__glibc_unlikely (inchar () == EOF))
encode_error ();
buf[0] = c;
continue;
}
if (__glibc_unlikely (n != 1))
encode_error ();
/* We have a match. */
++wstr;
break;
}
if (!(flags & SUPPRESS) && (flags & MALLOC)
&& wstr == (wchar_t *) *strptr + strsize)
{
/* Enlarge the buffer. */
wstr = (wchar_t *) realloc (*strptr,
(2 * strsize
* sizeof (wchar_t)));
if (wstr == NULL)
{
/* Can't allocate that much. Last-ditch effort. */
wstr = (wchar_t *) realloc (*strptr,
((strsize + 1)
* sizeof (wchar_t)));
if (wstr == NULL)
{
if (flags & POSIX_MALLOC)
{
done = EOF;
goto errout;
}
/* We lose. Oh well. Terminate the
string and stop converting, so at
least we don't skip any input. */
((wchar_t *) (*strptr))[strsize - 1] = L'\0';
strptr = NULL;
++done;
conv_error ();
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
++strsize;
}
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
strsize *= 2;
}
}
}
#endif
}
while ((width <= 0 || --width > 0) && inchar () != EOF);
if (!(flags & SUPPRESS))
{
*wstr++ = L'\0';
if ((flags & MALLOC) && wstr - (wchar_t *) *strptr != strsize)
{
wchar_t *cp = (wchar_t *) realloc (*strptr,
((wstr
- (wchar_t *) *strptr)
* sizeof(wchar_t)));
if (cp != NULL)
*strptr = (char *) cp;
}
strptr = NULL;
++done;
}
}
break;
case L_('x'): /* Hexadecimal integer. */
case L_('X'): /* Ditto. */
base = 16;
goto number;
case L_('o'): /* Octal integer. */
base = 8;
goto number;
case L_('u'): /* Unsigned decimal integer. */
base = 10;
goto number;
case L_('d'): /* Signed decimal integer. */
base = 10;
flags |= NUMBER_SIGNED;
goto number;
case L_('i'): /* Generic number. */
base = 0;
flags |= NUMBER_SIGNED;
number:
c = inchar ();
if (__glibc_unlikely (c == EOF))
input_error ();
/* Check for a sign. */
if (c == L_('-') || c == L_('+'))
{
char_buffer_add (&charbuf, c);
if (width > 0)
--width;
c = inchar ();
}
/* Look for a leading indication of base. */
if (width != 0 && c == L_('0'))
{
if (width > 0)
--width;
char_buffer_add (&charbuf, c);
c = inchar ();
if (width != 0 && TOLOWER (c) == L_('x'))
{
if (base == 0)
base = 16;
if (base == 16)
{
if (width > 0)
--width;
c = inchar ();
}
}
else if (base == 0)
base = 8;
}
if (base == 0)
base = 10;
if (base == 10 && __builtin_expect ((flags & I18N) != 0, 0))
{
int from_level;
int to_level;
int level;
#ifdef COMPILE_WSCANF
const wchar_t *wcdigits[10];
const wchar_t *wcdigits_extended[10];
#else
const char *mbdigits[10];
const char *mbdigits_extended[10];
#endif
/* "to_inpunct" is a map from ASCII digits to their
equivalent in locale. This is defined for locales
which use an extra digits set. */
wctrans_t map = __wctrans ("to_inpunct");
int n;
from_level = 0;
#ifdef COMPILE_WSCANF
to_level = _NL_CURRENT_WORD (LC_CTYPE,
_NL_CTYPE_INDIGITS_WC_LEN) - 1;
#else
to_level = (uint32_t) curctype->values[_NL_ITEM_INDEX (_NL_CTYPE_INDIGITS_MB_LEN)].word - 1;
#endif
/* Get the alternative digit forms if there are any. */
if (__glibc_unlikely (map != NULL))
{
/* Adding new level for extra digits set in locale file. */
++to_level;
for (n = 0; n < 10; ++n)
{
#ifdef COMPILE_WSCANF
wcdigits[n] = (const wchar_t *)
_NL_CURRENT (LC_CTYPE, _NL_CTYPE_INDIGITS0_WC + n);
wchar_t *wc_extended = (wchar_t *)
alloca ((to_level + 2) * sizeof (wchar_t));
__wmemcpy (wc_extended, wcdigits[n], to_level);
wc_extended[to_level] = __towctrans (L'0' + n, map);
wc_extended[to_level + 1] = '\0';
wcdigits_extended[n] = wc_extended;
#else
mbdigits[n]
= curctype->values[_NL_CTYPE_INDIGITS0_MB + n].string;
/* Get the equivalent wide char in map. */
wint_t extra_wcdigit = __towctrans (L'0' + n, map);
/* Convert it to multibyte representation. */
mbstate_t state;
memset (&state, '\0', sizeof (state));
char extra_mbdigit[MB_LEN_MAX];
size_t mblen
= __wcrtomb (extra_mbdigit, extra_wcdigit, &state);
if (mblen == (size_t) -1)
{
/* Ignore this new level. */
map = NULL;
break;
}
/* Calculate the length of mbdigits[n]. */
const char *last_char = mbdigits[n];
for (level = 0; level < to_level; ++level)
last_char = strchr (last_char, '\0') + 1;
size_t mbdigits_len = last_char - mbdigits[n];
/* Allocate memory for extended multibyte digit. */
char *mb_extended;
mb_extended = (char *) alloca (mbdigits_len + mblen + 1);
/* And get the mbdigits + extra_digit string. */
*(char *) __mempcpy (__mempcpy (mb_extended, mbdigits[n],
mbdigits_len),
extra_mbdigit, mblen) = '\0';
mbdigits_extended[n] = mb_extended;
#endif
}
}
/* Read the number into workspace. */
while (c != EOF && width != 0)
{
/* In this round we get the pointer to the digit strings
and also perform the first round of comparisons. */
for (n = 0; n < 10; ++n)
{
/* Get the string for the digits with value N. */
#ifdef COMPILE_WSCANF
/* wcdigits_extended[] is fully set in the loop
above, but the test for "map != NULL" is done
inside the loop here and outside the loop there. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (4.7, "-Wmaybe-uninitialized");
if (__glibc_unlikely (map != NULL))
wcdigits[n] = wcdigits_extended[n];
else
wcdigits[n] = (const wchar_t *)
_NL_CURRENT (LC_CTYPE, _NL_CTYPE_INDIGITS0_WC + n);
wcdigits[n] += from_level;
DIAG_POP_NEEDS_COMMENT;
if (c == (wint_t) *wcdigits[n])
{
to_level = from_level;
break;
}
/* Advance the pointer to the next string. */
++wcdigits[n];
#else
const char *cmpp;
int avail = width > 0 ? width : INT_MAX;
if (__glibc_unlikely (map != NULL))
mbdigits[n] = mbdigits_extended[n];
else
mbdigits[n]
= curctype->values[_NL_CTYPE_INDIGITS0_MB + n].string;
for (level = 0; level < from_level; level++)
mbdigits[n] = strchr (mbdigits[n], '\0') + 1;
cmpp = mbdigits[n];
while ((unsigned char) *cmpp == c && avail >= 0)
{
if (*++cmpp == '\0')
break;
else
{
if (avail == 0 || inchar () == EOF)
break;
--avail;
}
}
if (*cmpp == '\0')
{
if (width > 0)
width = avail;
to_level = from_level;
break;
}
/* We are pushing all read characters back. */
if (cmpp > mbdigits[n])
{
ungetc (c, s);
while (--cmpp > mbdigits[n])
ungetc_not_eof ((unsigned char) *cmpp, s);
c = (unsigned char) *cmpp;
}
/* Advance the pointer to the next string. */
mbdigits[n] = strchr (mbdigits[n], '\0') + 1;
#endif
}
if (n == 10)
{
/* Have not yet found the digit. */
for (level = from_level + 1; level <= to_level; ++level)
{
/* Search all ten digits of this level. */
for (n = 0; n < 10; ++n)
{
#ifdef COMPILE_WSCANF
if (c == (wint_t) *wcdigits[n])
break;
/* Advance the pointer to the next string. */
++wcdigits[n];
#else
const char *cmpp;
int avail = width > 0 ? width : INT_MAX;
cmpp = mbdigits[n];
while ((unsigned char) *cmpp == c && avail >= 0)
{
if (*++cmpp == '\0')
break;
else
{
if (avail == 0 || inchar () == EOF)
break;
--avail;
}
}
if (*cmpp == '\0')
{
if (width > 0)
width = avail;
break;
}
/* We are pushing all read characters back. */
if (cmpp > mbdigits[n])
{
ungetc (c, s);
while (--cmpp > mbdigits[n])
ungetc_not_eof ((unsigned char) *cmpp, s);
c = (unsigned char) *cmpp;
}
/* Advance the pointer to the next string. */
mbdigits[n] = strchr (mbdigits[n], '\0') + 1;
#endif
}
if (n < 10)
{
/* Found it. */
from_level = level;
to_level = level;
break;
}
}
}
if (n < 10)
c = L_('0') + n;
else if (flags & GROUP)
{
/* Try matching against the thousands separator. */
#ifdef COMPILE_WSCANF
if (c != thousands)
break;
#else
const char *cmpp = thousands;
int avail = width > 0 ? width : INT_MAX;
while ((unsigned char) *cmpp == c && avail >= 0)
{
char_buffer_add (&charbuf, c);
if (*++cmpp == '\0')
break;
else
{
if (avail == 0 || inchar () == EOF)
break;
--avail;
}
}
if (char_buffer_error (&charbuf))
{
__set_errno (ENOMEM);
done = EOF;
goto errout;
}
if (*cmpp != '\0')
{
/* We are pushing all read characters back. */
if (cmpp > thousands)
{
charbuf.current -= cmpp - thousands;
ungetc (c, s);
while (--cmpp > thousands)
ungetc_not_eof ((unsigned char) *cmpp, s);
c = (unsigned char) *cmpp;
}
break;
}
if (width > 0)
width = avail;
/* The last thousands character will be added back by
the char_buffer_add below. */
--charbuf.current;
#endif
}
else
break;
char_buffer_add (&charbuf, c);
if (width > 0)
--width;
c = inchar ();
}
}
else
/* Read the number into workspace. */
while (c != EOF && width != 0)
{
if (base == 16)
{
if (!ISXDIGIT (c))
break;
}
else if (!ISDIGIT (c) || (int) (c - L_('0')) >= base)
{
if (base == 10 && (flags & GROUP))
{
/* Try matching against the thousands separator. */
#ifdef COMPILE_WSCANF
if (c != thousands)
break;
#else
const char *cmpp = thousands;
int avail = width > 0 ? width : INT_MAX;
while ((unsigned char) *cmpp == c && avail >= 0)
{
char_buffer_add (&charbuf, c);
if (*++cmpp == '\0')
break;
else
{
if (avail == 0 || inchar () == EOF)
break;
--avail;
}
}
if (char_buffer_error (&charbuf))
{
__set_errno (ENOMEM);
done = EOF;
goto errout;
}
if (*cmpp != '\0')
{
/* We are pushing all read characters back. */
if (cmpp > thousands)
{
charbuf.current -= cmpp - thousands;
ungetc (c, s);
while (--cmpp > thousands)
ungetc_not_eof ((unsigned char) *cmpp, s);
c = (unsigned char) *cmpp;
}
break;
}
if (width > 0)
width = avail;
/* The last thousands character will be added back by
the char_buffer_add below. */
--charbuf.current;
#endif
}
else
break;
}
char_buffer_add (&charbuf, c);
if (width > 0)
--width;
c = inchar ();
}
if (char_buffer_error (&charbuf))
{
__set_errno (ENOMEM);
done = EOF;
goto errout;
}
if (char_buffer_size (&charbuf) == 0
|| (char_buffer_size (&charbuf) == 1
&& (char_buffer_start (&charbuf)[0] == L_('+')
|| char_buffer_start (&charbuf)[0] == L_('-'))))
{
/* There was no number. If we are supposed to read a pointer
we must recognize "(nil)" as well. */
if (__builtin_expect (char_buffer_size (&charbuf) == 0
&& (flags & READ_POINTER)
&& (width < 0 || width >= 5)
&& c == '('
&& TOLOWER (inchar ()) == L_('n')
&& TOLOWER (inchar ()) == L_('i')
&& TOLOWER (inchar ()) == L_('l')
&& inchar () == L_(')'), 1))
/* We must produce the value of a NULL pointer. A single
'0' digit is enough. */
char_buffer_add (&charbuf, L_('0'));
else
{
/* The last read character is not part of the number
anymore. */
ungetc (c, s);
conv_error ();
}
}
else
/* The just read character is not part of the number anymore. */
ungetc (c, s);
/* Convert the number. */
char_buffer_add (&charbuf, L_('\0'));
if (char_buffer_error (&charbuf))
{
__set_errno (ENOMEM);
done = EOF;
goto errout;
}
if (need_longlong && (flags & LONGDBL))
{
if (flags & NUMBER_SIGNED)
num.q = __strtoll_internal
(char_buffer_start (&charbuf), &tw, base, flags & GROUP);
else
num.uq = __strtoull_internal
(char_buffer_start (&charbuf), &tw, base, flags & GROUP);
}
else
{
if (flags & NUMBER_SIGNED)
num.l = __strtol_internal
(char_buffer_start (&charbuf), &tw, base, flags & GROUP);
else
num.ul = __strtoul_internal
(char_buffer_start (&charbuf), &tw, base, flags & GROUP);
}
if (__glibc_unlikely (char_buffer_start (&charbuf) == tw))
conv_error ();
if (!(flags & SUPPRESS))
{
if (flags & NUMBER_SIGNED)
{
if (need_longlong && (flags & LONGDBL))
*ARG (LONGLONG int *) = num.q;
else if (need_long && (flags & LONG))
*ARG (long int *) = num.l;
else if (flags & SHORT)
*ARG (short int *) = (short int) num.l;
else if (!(flags & CHAR))
*ARG (int *) = (int) num.l;
else
*ARG (signed char *) = (signed char) num.ul;
}
else
{
if (need_longlong && (flags & LONGDBL))
*ARG (unsigned LONGLONG int *) = num.uq;
else if (need_long && (flags & LONG))
*ARG (unsigned long int *) = num.ul;
else if (flags & SHORT)
*ARG (unsigned short int *)
= (unsigned short int) num.ul;
else if (!(flags & CHAR))
*ARG (unsigned int *) = (unsigned int) num.ul;
else
*ARG (unsigned char *) = (unsigned char) num.ul;
}
++done;
}
break;
case L_('e'): /* Floating-point numbers. */
case L_('E'):
case L_('f'):
case L_('F'):
case L_('g'):
case L_('G'):
case L_('a'):
case L_('A'):
c = inchar ();
if (width > 0)
--width;
if (__glibc_unlikely (c == EOF))
input_error ();
got_digit = got_dot = got_e = 0;
/* Check for a sign. */
if (c == L_('-') || c == L_('+'))
{
negative = c == L_('-');
if (__glibc_unlikely (width == 0 || inchar () == EOF))
/* EOF is only an input error before we read any chars. */
conv_error ();
if (width > 0)
--width;
}
else
negative = 0;
/* Take care for the special arguments "nan" and "inf". */
if (TOLOWER (c) == L_('n'))
{
/* Maybe "nan". */
char_buffer_add (&charbuf, c);
if (__builtin_expect (width == 0
|| inchar () == EOF
|| TOLOWER (c) != L_('a'), 0))
conv_error ();
if (width > 0)
--width;
char_buffer_add (&charbuf, c);
if (__builtin_expect (width == 0
|| inchar () == EOF
|| TOLOWER (c) != L_('n'), 0))
conv_error ();
if (width > 0)
--width;
char_buffer_add (&charbuf, c);
/* It is "nan". */
goto scan_float;
}
else if (TOLOWER (c) == L_('i'))
{
/* Maybe "inf" or "infinity". */
char_buffer_add (&charbuf, c);
if (__builtin_expect (width == 0
|| inchar () == EOF
|| TOLOWER (c) != L_('n'), 0))
conv_error ();
if (width > 0)
--width;
char_buffer_add (&charbuf, c);
if (__builtin_expect (width == 0
|| inchar () == EOF
|| TOLOWER (c) != L_('f'), 0))
conv_error ();
if (width > 0)
--width;
char_buffer_add (&charbuf, c);
/* It is as least "inf". */
if (width != 0 && inchar () != EOF)
{
if (TOLOWER (c) == L_('i'))
{
if (width > 0)
--width;
/* Now we have to read the rest as well. */
char_buffer_add (&charbuf, c);
if (__builtin_expect (width == 0
|| inchar () == EOF
|| TOLOWER (c) != L_('n'), 0))
conv_error ();
if (width > 0)
--width;
char_buffer_add (&charbuf, c);
if (__builtin_expect (width == 0
|| inchar () == EOF
|| TOLOWER (c) != L_('i'), 0))
conv_error ();
if (width > 0)
--width;
char_buffer_add (&charbuf, c);
if (__builtin_expect (width == 0
|| inchar () == EOF
|| TOLOWER (c) != L_('t'), 0))
conv_error ();
if (width > 0)
--width;
char_buffer_add (&charbuf, c);
if (__builtin_expect (width == 0
|| inchar () == EOF
|| TOLOWER (c) != L_('y'), 0))
conv_error ();
if (width > 0)
--width;
char_buffer_add (&charbuf, c);
}
else
/* Never mind. */
ungetc (c, s);
}
goto scan_float;
}
exp_char = L_('e');
if (width != 0 && c == L_('0'))
{
char_buffer_add (&charbuf, c);
c = inchar ();
if (width > 0)
--width;
if (width != 0 && TOLOWER (c) == L_('x'))
{
/* It is a number in hexadecimal format. */
char_buffer_add (&charbuf, c);
flags |= HEXA_FLOAT;
exp_char = L_('p');
/* Grouping is not allowed. */
flags &= ~GROUP;
c = inchar ();
if (width > 0)
--width;
}
else
got_digit = 1;
}
while (1)
{
if (char_buffer_error (&charbuf))
{
__set_errno (ENOMEM);
done = EOF;
goto errout;
}
if (ISDIGIT (c))
{
char_buffer_add (&charbuf, c);
got_digit = 1;
}
else if (!got_e && (flags & HEXA_FLOAT) && ISXDIGIT (c))
{
char_buffer_add (&charbuf, c);
got_digit = 1;
}
else if (got_e && charbuf.current[-1] == exp_char
&& (c == L_('-') || c == L_('+')))
char_buffer_add (&charbuf, c);
else if (got_digit && !got_e
&& (CHAR_T) TOLOWER (c) == exp_char)
{
char_buffer_add (&charbuf, exp_char);
got_e = got_dot = 1;
}
else
{
#ifdef COMPILE_WSCANF
if (! got_dot && c == decimal)
{
char_buffer_add (&charbuf, c);
got_dot = 1;
}
else if ((flags & GROUP) != 0 && ! got_dot && c == thousands)
char_buffer_add (&charbuf, c);
else
{
/* The last read character is not part of the number
anymore. */
ungetc (c, s);
break;
}
#else
const char *cmpp = decimal;
int avail = width > 0 ? width : INT_MAX;
if (! got_dot)
{
while ((unsigned char) *cmpp == c && avail >= 0)
if (*++cmpp == '\0')
break;
else
{
if (avail == 0 || inchar () == EOF)
break;
--avail;
}
}
if (*cmpp == '\0')
{
/* Add all the characters. */
for (cmpp = decimal; *cmpp != '\0'; ++cmpp)
char_buffer_add (&charbuf, (unsigned char) *cmpp);
if (width > 0)
width = avail;
got_dot = 1;
}
else
{
/* Figure out whether it is a thousands separator.
There is one problem: we possibly read more than
one character. We cannot push them back but since
we know that parts of the `decimal' string matched,
we can compare against it. */
const char *cmp2p = thousands;
if ((flags & GROUP) != 0 && ! got_dot)
{
while (cmp2p - thousands < cmpp - decimal
&& *cmp2p == decimal[cmp2p - thousands])
++cmp2p;
if (cmp2p - thousands == cmpp - decimal)
{
while ((unsigned char) *cmp2p == c && avail >= 0)
if (*++cmp2p == '\0')
break;
else
{
if (avail == 0 || inchar () == EOF)
break;
--avail;
}
}
}
if (cmp2p != NULL && *cmp2p == '\0')
{
/* Add all the characters. */
for (cmpp = thousands; *cmpp != '\0'; ++cmpp)
char_buffer_add (&charbuf, (unsigned char) *cmpp);
if (width > 0)
width = avail;
}
else
{
/* The last read character is not part of the number
anymore. */
ungetc (c, s);
break;
}
}
#endif
}
if (width == 0 || inchar () == EOF)
break;
if (width > 0)
--width;
}
if (char_buffer_error (&charbuf))
{
__set_errno (ENOMEM);
done = EOF;
goto errout;
}
wctrans_t map;
if (__builtin_expect ((flags & I18N) != 0, 0)
/* Hexadecimal floats make no sense, fixing localized
digits with ASCII letters. */
&& !(flags & HEXA_FLOAT)
/* Minimum requirement. */
&& (char_buffer_size (&charbuf) == 0 || got_dot)
&& (map = __wctrans ("to_inpunct")) != NULL)
{
/* Reget the first character. */
inchar ();
/* Localized digits, decimal points, and thousands
separator. */
wint_t wcdigits[12];
/* First get decimal equivalent to check if we read it
or not. */
wcdigits[11] = __towctrans (L'.', map);
/* If we have not read any character or have just read
locale decimal point which matches the decimal point
for localized FP numbers, then we may have localized
digits. Note, we test GOT_DOT above. */
#ifdef COMPILE_WSCANF
if (char_buffer_size (&charbuf) == 0
|| (char_buffer_size (&charbuf) == 1
&& wcdigits[11] == decimal))
#else
char mbdigits[12][MB_LEN_MAX + 1];
mbstate_t state;
memset (&state, '\0', sizeof (state));
bool match_so_far = char_buffer_size (&charbuf) == 0;
size_t mblen = __wcrtomb (mbdigits[11], wcdigits[11], &state);
if (mblen != (size_t) -1)
{
mbdigits[11][mblen] = '\0';
match_so_far |=
(char_buffer_size (&charbuf) == strlen (decimal)
&& strcmp (decimal, mbdigits[11]) == 0);
}
else
{
size_t decimal_len = strlen (decimal);
/* This should always be the case but the data comes
from a file. */
if (decimal_len <= MB_LEN_MAX)
{
match_so_far |= char_buffer_size (&charbuf) == decimal_len;
memcpy (mbdigits[11], decimal, decimal_len + 1);
}
else
match_so_far = false;
}
if (match_so_far)
#endif
{
bool have_locthousands = (flags & GROUP) != 0;
/* Now get the digits and the thousands-sep equivalents. */
for (int n = 0; n < 11; ++n)
{
if (n < 10)
wcdigits[n] = __towctrans (L'0' + n, map);
else if (n == 10)
{
wcdigits[10] = __towctrans (L',', map);
have_locthousands &= wcdigits[10] != L'\0';
}
#ifndef COMPILE_WSCANF
memset (&state, '\0', sizeof (state));
size_t mblen = __wcrtomb (mbdigits[n], wcdigits[n],
&state);
if (mblen == (size_t) -1)
{
if (n == 10)
{
if (have_locthousands)
{
size_t thousands_len = strlen (thousands);
if (thousands_len <= MB_LEN_MAX)
memcpy (mbdigits[10], thousands,
thousands_len + 1);
else
have_locthousands = false;
}
}
else
/* Ignore checking against localized digits. */
goto no_i18nflt;
}
else
mbdigits[n][mblen] = '\0';
#endif
}
/* Start checking against localized digits, if
conversion is done correctly. */
while (1)
{
if (char_buffer_error (&charbuf))
{
__set_errno (ENOMEM);
done = EOF;
goto errout;
}
if (got_e && charbuf.current[-1] == exp_char
&& (c == L_('-') || c == L_('+')))
char_buffer_add (&charbuf, c);
else if (char_buffer_size (&charbuf) > 0 && !got_e
&& (CHAR_T) TOLOWER (c) == exp_char)
{
char_buffer_add (&charbuf, exp_char);
got_e = got_dot = 1;
}
else
{
/* Check against localized digits, decimal point,
and thousands separator. */
int n;
for (n = 0; n < 12; ++n)
{
#ifdef COMPILE_WSCANF
if (c == wcdigits[n])
{
if (n < 10)
char_buffer_add (&charbuf, L_('0') + n);
else if (n == 11 && !got_dot)
{
char_buffer_add (&charbuf, decimal);
got_dot = 1;
}
else if (n == 10 && have_locthousands
&& ! got_dot)
char_buffer_add (&charbuf, thousands);
else
/* The last read character is not part
of the number anymore. */
n = 12;
break;
}
#else
const char *cmpp = mbdigits[n];
int avail = width > 0 ? width : INT_MAX;
while ((unsigned char) *cmpp == c && avail >= 0)
if (*++cmpp == '\0')
break;
else
{
if (avail == 0 || inchar () == EOF)
break;
--avail;
}
if (*cmpp == '\0')
{
if (width > 0)
width = avail;
if (n < 10)
char_buffer_add (&charbuf, L_('0') + n);
else if (n == 11 && !got_dot)
{
/* Add all the characters. */
for (cmpp = decimal; *cmpp != '\0';
++cmpp)
char_buffer_add (&charbuf,
(unsigned char) *cmpp);
got_dot = 1;
}
else if (n == 10 && (flags & GROUP) != 0
&& ! got_dot)
{
/* Add all the characters. */
for (cmpp = thousands; *cmpp != '\0';
++cmpp)
char_buffer_add (&charbuf,
(unsigned char) *cmpp);
}
else
/* The last read character is not part
of the number anymore. */
n = 12;
break;
}
/* We are pushing all read characters back. */
if (cmpp > mbdigits[n])
{
ungetc (c, s);
while (--cmpp > mbdigits[n])
ungetc_not_eof ((unsigned char) *cmpp, s);
c = (unsigned char) *cmpp;
}
#endif
}
if (n >= 12)
{
/* The last read character is not part
of the number anymore. */
ungetc (c, s);
break;
}
}
if (width == 0 || inchar () == EOF)
break;
if (width > 0)
--width;
}
}
#ifndef COMPILE_WSCANF
no_i18nflt:
;
#endif
}
if (char_buffer_error (&charbuf))
{
__set_errno (ENOMEM);
done = EOF;
goto errout;
}
/* Have we read any character? If we try to read a number
in hexadecimal notation and we have read only the `0x'
prefix this is an error. */
if (__glibc_unlikely (char_buffer_size (&charbuf) == 0
|| ((flags & HEXA_FLOAT)
&& char_buffer_size (&charbuf) == 2)))
conv_error ();
scan_float:
/* Convert the number. */
char_buffer_add (&charbuf, L_('\0'));
if (char_buffer_error (&charbuf))
{
__set_errno (ENOMEM);
done = EOF;
goto errout;
}
if ((flags & LONGDBL) && !__ldbl_is_dbl)
{
long double d = __strtold_internal
(char_buffer_start (&charbuf), &tw, flags & GROUP);
if (!(flags & SUPPRESS) && tw != char_buffer_start (&charbuf))
*ARG (long double *) = negative ? -d : d;
}
else if (flags & (LONG | LONGDBL))
{
double d = __strtod_internal
(char_buffer_start (&charbuf), &tw, flags & GROUP);
if (!(flags & SUPPRESS) && tw != char_buffer_start (&charbuf))
*ARG (double *) = negative ? -d : d;
}
else
{
float d = __strtof_internal
(char_buffer_start (&charbuf), &tw, flags & GROUP);
if (!(flags & SUPPRESS) && tw != char_buffer_start (&charbuf))
*ARG (float *) = negative ? -d : d;
}
if (__glibc_unlikely (tw == char_buffer_start (&charbuf)))
conv_error ();
if (!(flags & SUPPRESS))
++done;
break;
case L_('['): /* Character class. */
if (flags & LONG)
STRING_ARG (wstr, wchar_t, 100);
else
STRING_ARG (str, char, 100);
if (*f == L_('^'))
{
++f;
not_in = 1;
}
else
not_in = 0;
if (width < 0)
/* There is no width given so there is also no limit on the
number of characters we read. Therefore we set width to
a very high value to make the algorithm easier. */
width = INT_MAX;
#ifdef COMPILE_WSCANF
/* Find the beginning and the end of the scanlist. We are not
creating a lookup table since it would have to be too large.
Instead we search each time through the string. This is not
a constant lookup time but who uses this feature deserves to
be punished. */
tw = (wchar_t *) f; /* Marks the beginning. */
if (*f == L']')
++f;
while ((fc = *f++) != L'\0' && fc != L']');
if (__glibc_unlikely (fc == L'\0'))
conv_error ();
wchar_t *twend = (wchar_t *) f - 1;
#else
/* Fill WP with byte flags indexed by character.
We will use this flag map for matching input characters. */
if (!scratch_buffer_set_array_size
(&charbuf.scratch, UCHAR_MAX + 1, 1))
{
done = EOF;
goto errout;
}
memset (charbuf.scratch.data, '\0', UCHAR_MAX + 1);
fc = *f;
if (fc == ']' || fc == '-')
{
/* If ] or - appears before any char in the set, it is not
the terminator or separator, but the first char in the
set. */
((char *)charbuf.scratch.data)[fc] = 1;
++f;
}
while ((fc = *f++) != '\0' && fc != ']')
if (fc == '-' && *f != '\0' && *f != ']'
&& (unsigned char) f[-2] <= (unsigned char) *f)
{
/* Add all characters from the one before the '-'
up to (but not including) the next format char. */
for (fc = (unsigned char) f[-2]; fc < (unsigned char) *f; ++fc)
((char *)charbuf.scratch.data)[fc] = 1;
}
else
/* Add the character to the flag map. */
((char *)charbuf.scratch.data)[fc] = 1;
if (__glibc_unlikely (fc == '\0'))
conv_error();
#endif
if (flags & LONG)
{
size_t now = read_in;
#ifdef COMPILE_WSCANF
if (__glibc_unlikely (inchar () == WEOF))
input_error ();
do
{
wchar_t *runp;
/* Test whether it's in the scanlist. */
runp = tw;
while (runp < twend)
{
if (runp[0] == L'-' && runp[1] != '\0'
&& runp + 1 != twend
&& runp != tw
&& (unsigned int) runp[-1] <= (unsigned int) runp[1])
{
/* Match against all characters in between the
first and last character of the sequence. */
wchar_t wc;
for (wc = runp[-1] + 1; wc <= runp[1]; ++wc)
if ((wint_t) wc == c)
break;
if (wc <= runp[1] && !not_in)
break;
if (wc <= runp[1] && not_in)
{
/* The current character is not in the
scanset. */
ungetc (c, s);
goto out;
}
runp += 2;
}
else
{
if ((wint_t) *runp == c && !not_in)
break;
if ((wint_t) *runp == c && not_in)
{
ungetc (c, s);
goto out;
}
++runp;
}
}
if (runp == twend && !not_in)
{
ungetc (c, s);
goto out;
}
if (!(flags & SUPPRESS))
{
*wstr++ = c;
if ((flags & MALLOC)
&& wstr == (wchar_t *) *strptr + strsize)
{
/* Enlarge the buffer. */
wstr = (wchar_t *) realloc (*strptr,
(2 * strsize)
* sizeof (wchar_t));
if (wstr == NULL)
{
/* Can't allocate that much. Last-ditch
effort. */
wstr = (wchar_t *)
realloc (*strptr, (strsize + 1)
* sizeof (wchar_t));
if (wstr == NULL)
{
if (flags & POSIX_MALLOC)
{
done = EOF;
goto errout;
}
/* We lose. Oh well. Terminate the string
and stop converting, so at least we don't
skip any input. */
((wchar_t *) (*strptr))[strsize - 1] = L'\0';
strptr = NULL;
++done;
conv_error ();
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
++strsize;
}
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
strsize *= 2;
}
}
}
}
while (--width > 0 && inchar () != WEOF);
out:
#else
char buf[MB_LEN_MAX];
size_t cnt = 0;
mbstate_t cstate;
if (__glibc_unlikely (inchar () == EOF))
input_error ();
memset (&cstate, '\0', sizeof (cstate));
do
{
if (((char *) charbuf.scratch.data)[c] == not_in)
{
ungetc_not_eof (c, s);
break;
}
/* This is easy. */
if (!(flags & SUPPRESS))
{
size_t n;
/* Convert it into a wide character. */
buf[0] = c;
n = __mbrtowc (wstr, buf, 1, &cstate);
if (n == (size_t) -2)
{
/* Possibly correct character, just not enough
input. */
++cnt;
assert (cnt < MB_LEN_MAX);
continue;
}
cnt = 0;
++wstr;
if ((flags & MALLOC)
&& wstr == (wchar_t *) *strptr + strsize)
{
/* Enlarge the buffer. */
wstr = (wchar_t *) realloc (*strptr,
(2 * strsize
* sizeof (wchar_t)));
if (wstr == NULL)
{
/* Can't allocate that much. Last-ditch
effort. */
wstr = (wchar_t *)
realloc (*strptr, ((strsize + 1)
* sizeof (wchar_t)));
if (wstr == NULL)
{
if (flags & POSIX_MALLOC)
{
done = EOF;
goto errout;
}
/* We lose. Oh well. Terminate the
string and stop converting,
so at least we don't skip any input. */
((wchar_t *) (*strptr))[strsize - 1] = L'\0';
strptr = NULL;
++done;
conv_error ();
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
++strsize;
}
}
else
{
*strptr = (char *) wstr;
wstr += strsize;
strsize *= 2;
}
}
}
if (--width <= 0)
break;
}
while (inchar () != EOF);
if (__glibc_unlikely (cnt != 0))
/* We stopped in the middle of recognizing another
character. That's a problem. */
encode_error ();
#endif
if (__glibc_unlikely (now == read_in))
/* We haven't succesfully read any character. */
conv_error ();
if (!(flags & SUPPRESS))
{
*wstr++ = L'\0';
if ((flags & MALLOC)
&& wstr - (wchar_t *) *strptr != strsize)
{
wchar_t *cp = (wchar_t *)
realloc (*strptr, ((wstr - (wchar_t *) *strptr)
* sizeof(wchar_t)));
if (cp != NULL)
*strptr = (char *) cp;
}
strptr = NULL;
++done;
}
}
else
{
size_t now = read_in;
if (__glibc_unlikely (inchar () == EOF))
input_error ();
#ifdef COMPILE_WSCANF
memset (&state, '\0', sizeof (state));
do
{
wchar_t *runp;
size_t n;
/* Test whether it's in the scanlist. */
runp = tw;
while (runp < twend)
{
if (runp[0] == L'-' && runp[1] != '\0'
&& runp + 1 != twend
&& runp != tw
&& (unsigned int) runp[-1] <= (unsigned int) runp[1])
{
/* Match against all characters in between the
first and last character of the sequence. */
wchar_t wc;
for (wc = runp[-1] + 1; wc <= runp[1]; ++wc)
if ((wint_t) wc == c)
break;
if (wc <= runp[1] && !not_in)
break;
if (wc <= runp[1] && not_in)
{
/* The current character is not in the
scanset. */
ungetc (c, s);
goto out2;
}
runp += 2;
}
else
{
if ((wint_t) *runp == c && !not_in)
break;
if ((wint_t) *runp == c && not_in)
{
ungetc (c, s);
goto out2;
}
++runp;
}
}
if (runp == twend && !not_in)
{
ungetc (c, s);
goto out2;
}
if (!(flags & SUPPRESS))
{
if ((flags & MALLOC)
&& *strptr + strsize - str <= MB_LEN_MAX)
{
/* Enlarge the buffer. */
size_t strleng = str - *strptr;
char *newstr;
newstr = (char *) realloc (*strptr, 2 * strsize);
if (newstr == NULL)
{
/* Can't allocate that much. Last-ditch
effort. */
newstr = (char *) realloc (*strptr,
strleng + MB_LEN_MAX);
if (newstr == NULL)
{
if (flags & POSIX_MALLOC)
{
done = EOF;
goto errout;
}
/* We lose. Oh well. Terminate the string
and stop converting, so at least we don't
skip any input. */
((char *) (*strptr))[strleng] = '\0';
strptr = NULL;
++done;
conv_error ();
}
else
{
*strptr = newstr;
str = newstr + strleng;
strsize = strleng + MB_LEN_MAX;
}
}
else
{
*strptr = newstr;
str = newstr + strleng;
strsize *= 2;
}
}
}
n = __wcrtomb (!(flags & SUPPRESS) ? str : NULL, c, &state);
if (__glibc_unlikely (n == (size_t) -1))
encode_error ();
assert (n <= MB_LEN_MAX);
str += n;
}
while (--width > 0 && inchar () != WEOF);
out2:
#else
do
{
if (((char *) charbuf.scratch.data)[c] == not_in)
{
ungetc_not_eof (c, s);
break;
}
/* This is easy. */
if (!(flags & SUPPRESS))
{
*str++ = c;
if ((flags & MALLOC)
&& (char *) str == *strptr + strsize)
{
/* Enlarge the buffer. */
size_t newsize = 2 * strsize;
allocagain:
str = (char *) realloc (*strptr, newsize);
if (str == NULL)
{
/* Can't allocate that much. Last-ditch
effort. */
if (newsize > strsize + 1)
{
newsize = strsize + 1;
goto allocagain;
}
if (flags & POSIX_MALLOC)
{
done = EOF;
goto errout;
}
/* We lose. Oh well. Terminate the
string and stop converting,
so at least we don't skip any input. */
((char *) (*strptr))[strsize - 1] = '\0';
strptr = NULL;
++done;
conv_error ();
}
else
{
*strptr = (char *) str;
str += strsize;
strsize = newsize;
}
}
}
}
while (--width > 0 && inchar () != EOF);
#endif
if (__glibc_unlikely (now == read_in))
/* We haven't succesfully read any character. */
conv_error ();
if (!(flags & SUPPRESS))
{
#ifdef COMPILE_WSCANF
/* We have to emit the code to get into the initial
state. */
char buf[MB_LEN_MAX];
size_t n = __wcrtomb (buf, L'\0', &state);
if (n > 0 && (flags & MALLOC)
&& str + n >= *strptr + strsize)
{
/* Enlarge the buffer. */
size_t strleng = str - *strptr;
char *newstr;
newstr = (char *) realloc (*strptr, strleng + n + 1);
if (newstr == NULL)
{
if (flags & POSIX_MALLOC)
{
done = EOF;
goto errout;
}
/* We lose. Oh well. Terminate the string
and stop converting, so at least we don't
skip any input. */
((char *) (*strptr))[strleng] = '\0';
strptr = NULL;
++done;
conv_error ();
}
else
{
*strptr = newstr;
str = newstr + strleng;
strsize = strleng + n + 1;
}
}
str = __mempcpy (str, buf, n);
#endif
*str++ = '\0';
if ((flags & MALLOC) && str - *strptr != strsize)
{
char *cp = (char *) realloc (*strptr, str - *strptr);
if (cp != NULL)
*strptr = cp;
}
strptr = NULL;
++done;
}
}
break;
case L_('p'): /* Generic pointer. */
base = 16;
/* A PTR must be the same size as a `long int'. */
flags &= ~(SHORT|LONGDBL);
if (need_long)
flags |= LONG;
flags |= READ_POINTER;
goto number;
default:
/* If this is an unknown format character punt. */
conv_error ();
}
}
/* The last thing we saw int the format string was a white space.
Consume the last white spaces. */
if (skip_space)
{
do
c = inchar ();
while (ISSPACE (c));
ungetc (c, s);
}
errout:
/* Unlock stream. */
UNLOCK_STREAM (s);
scratch_buffer_free (&charbuf.scratch);
if (errp != NULL)
*errp |= errval;
if (__glibc_unlikely (done == EOF))
{
if (__glibc_unlikely (ptrs_to_free != NULL))
{
struct ptrs_to_free *p = ptrs_to_free;
while (p != NULL)
{
for (size_t cnt = 0; cnt < p->count; ++cnt)
{
free (*p->ptrs[cnt]);
*p->ptrs[cnt] = NULL;
}
p = p->next;
ptrs_to_free = p;
}
}
}
else if (__glibc_unlikely (strptr != NULL))
{
free (*strptr);
*strptr = NULL;
}
return done;
}
#ifdef COMPILE_WSCANF
int
__vfwscanf (FILE *s, const wchar_t *format, va_list argptr)
{
return _IO_vfwscanf (s, format, argptr, NULL);
}
ldbl_weak_alias (__vfwscanf, vfwscanf)
#else
int
___vfscanf (FILE *s, const char *format, va_list argptr)
{
return _IO_vfscanf_internal (s, format, argptr, NULL);
}
ldbl_strong_alias (_IO_vfscanf_internal, _IO_vfscanf)
ldbl_hidden_def (_IO_vfscanf_internal, _IO_vfscanf)
ldbl_strong_alias (___vfscanf, __vfscanf)
ldbl_hidden_def (___vfscanf, __vfscanf)
ldbl_weak_alias (___vfscanf, vfscanf)
#endif
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