AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-18 02:50:09 +00:00
Code Issues Packages Projects Releases Wiki Activity
7f2a1e3cf8
glibc/stdio-common/vfscanf.c
Ulrich Drepper c53a89d434 Update. 
* stdio-common/vfscanf.c: Fix reading (nil) for %p.
1998-09-18 18:51:34 +00:00

1278 lines
31 KiB
C
Raw Blame History

/* Copyright (C) 1991,92,93,94,95,96,97,98 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <limits.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wctype.h>
#include <bits/libc-lock.h>
#include <locale/localeinfo.h>
#ifdef __GNUC__
# define HAVE_LONGLONG
# define LONGLONG long long
#else
# define LONGLONG long
#endif
/* Those are flags in the conversion format. */
# define LONG 0x001 /* l: long or double */
# define LONGDBL 0x002 /* L: long long or long double */
# define SHORT 0x004 /* h: short */
# define SUPPRESS 0x008 /* *: suppress assignment */
# define POINTER 0x010 /* weird %p pointer (`fake hex') */
# define NOSKIP 0x020 /* do not skip blanks */
# define WIDTH 0x040 /* width was given */
# define GROUP 0x080 /* ': group numbers */
# define MALLOC 0x100 /* a: malloc strings */
# define CHAR 0x200 /* hh: char */
#ifdef USE_IN_LIBIO
# include <libioP.h>
# include <libio.h>
# undef va_list
# define va_list _IO_va_list
# define ungetc(c, s) ((void) ((int) c == EOF \
|| (--read_in, \
_IO_sputbackc (s, (unsigned char) c))))
# define inchar() (c == EOF ? EOF \
: ((c = _IO_getc_unlocked (s)), \
(void) (c != EOF && ++read_in), c))
# define encode_error() do { \
if (errp != NULL) *errp |= 4; \
_IO_funlockfile (s); \
__libc_cleanup_end (0); \
__set_errno (EILSEQ); \
return done; \
} while (0)
# define conv_error() do { \
if (errp != NULL) *errp |= 2; \
_IO_funlockfile (s); \
__libc_cleanup_end (0); \
return done; \
} while (0)
# define input_error() do { \
_IO_funlockfile (s); \
if (errp != NULL) *errp |= 1; \
__libc_cleanup_end (0); \
return done ?: EOF; \
} while (0)
# define memory_error() do { \
_IO_funlockfile (s); \
__set_errno (ENOMEM); \
__libc_cleanup_end (0); \
return EOF; \
} 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 ((void (*) (void *)) &_IO_funlockfile, (S)); \
_IO_flockfile (S)
# define UNLOCK_STREAM(S) \
_IO_funlockfile (S); \
__libc_cleanup_region_end (0)
#else
# define ungetc(c, s) ((void) (c != EOF && --read_in), ungetc (c, s))
# define inchar() (c == EOF ? EOF \
: ((c = getc (s)), (void) (c != EOF && ++read_in), c))
# define encode_error() do { \
funlockfile (s); \
__set_errno (EILSEQ); \
return done; \
} while (0)
# define conv_error() do { \
funlockfile (s); \
return done; \
} while (0)
# define input_error() do { \
funlockfile (s); \
return done ?: EOF; \
} while (0)
# define memory_error() do { \
funlockfile (s); \
__set_errno (ENOMEM); \
return EOF; \
} while (0)
# define ARGCHECK(s, format) \
do \
{ \
/* Check file argument for consistence. */ \
if (!__validfp (s) || !s->__mode.__read) \
{ \
__set_errno (EBADF); \
return EOF; \
} \
else if (format == NULL) \
{ \
__set_errno (EINVAL); \
return EOF; \
} \
} while (0)
#if 1
/* XXX For now !!! */
# define flockfile(S) /* nothing */
# define funlockfile(S) /* nothing */
# define LOCK_STREAM(S)
# define UNLOCK_STREAM(S)
#else
# define LOCK_STREAM(S) \
__libc_cleanup_region_start (&__funlockfile, (S)); \
__flockfile (S)
# define UNLOCK_STREAM(S) \
__funlockfile (S); \
__libc_cleanup_region_end (0)
#endif
#endif
/* 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 USE_IN_LIBIO
int
_IO_vfscanf (s, format, argptr, errp)
_IO_FILE *s;
const char *format;
_IO_va_list argptr;
int *errp;
#else
int
__vfscanf (FILE *s, const char *format, va_list argptr)
#endif
{
va_list arg;
register const char *f = format;
register unsigned char fc; /* Current character of the format. */
register size_t done = 0; /* Assignments done. */
register size_t read_in = 0; /* Chars read in. */
register int c = 0; /* Last char read. */
register int width; /* Maximum field width. */
register int flags; /* Modifiers for current format element. */
/* Status for reading F-P nums. */
char got_dot, got_e, negative;
/* If a [...] is a [^...]. */
char not_in;
#define exp_char not_in
/* Base for integral numbers. */
int base;
/* Signedness for integral numbers. */
int number_signed;
#define is_hexa number_signed
/* Decimal point character. */
wchar_t decimal;
/* The thousands character of the current locale. */
wchar_t thousands;
/* 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;
size_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;
/* Nonzero if we are reading a pointer. */
int read_pointer;
/* Workspace. */
char *tw; /* Temporary pointer. */
char *wp = NULL; /* Workspace. */
size_t wpmax = 0; /* Maximal size of workspace. */
size_t wpsize; /* Currently used bytes in workspace. */
#define ADDW(Ch) \
do \
{ \
if (wpsize == wpmax) \
{ \
char *old = wp; \
wpmax = UCHAR_MAX > 2 * wpmax ? UCHAR_MAX : 2 * wpmax; \
wp = (char *) alloca (wpmax); \
if (old != NULL) \
memcpy (wp, old, wpsize); \
} \
wp[wpsize++] = (Ch); \
} \
while (0)
#ifdef __va_copy
__va_copy (arg, argptr);
#else
arg = (va_list) argptr;
#endif
ARGCHECK (s, format);
/* Figure out the decimal point character. */
if (mbtowc (&decimal, _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT),
strlen (_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT))) <= 0)
decimal = (wchar_t) *_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT);
/* Figure out the thousands separator character. */
if (mbtowc (&thousands, _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP),
strlen (_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP))) <= 0)
thousands = (wchar_t) *_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);
/* Lock the stream. */
LOCK_STREAM (s);
/* Run through the format string. */
while (*f != '\0')
{
unsigned int argpos;
/* Extract the next argument, which is of type TYPE.
For a %N$... spec, this is the Nth argument from the beginning;
otherwise it is the next argument after the state now in ARG. */
#ifdef __va_copy
# define ARG(type) (argpos == 0 ? va_arg (arg, type) : \
({ unsigned int pos = argpos; \
va_list arg; \
__va_copy (arg, argptr); \
while (--pos > 0) \
(void) va_arg (arg, void *); \
va_arg (arg, type); \
}))
#else
# if 0
/* XXX Possible optimization. */
# define ARG(type) (argpos == 0 ? va_arg (arg, type) : \
({ va_list arg = (va_list) argptr; \
arg = (va_list) ((char *) arg \
+ (argpos - 1) \
* __va_rounded_size (void *)); \
va_arg (arg, type); \
}))
# else
# define ARG(type) (argpos == 0 ? va_arg (arg, type) : \
({ unsigned int pos = argpos; \
va_list arg = (va_list) argptr; \
while (--pos > 0) \
(void) va_arg (arg, void *); \
va_arg (arg, type); \
}))
# endif
#endif
if (!isascii (*f))
{
/* Non-ASCII, may be a multibyte. */
int len = mblen (f, strlen (f));
if (len > 0)
{
do
{
c = inchar ();
if (c == EOF)
input_error ();
else if (c != *f++)
{
ungetc (c, s);
conv_error ();
}
}
while (--len > 0);
continue;
}
}
fc = *f++;
if (fc != '%')
{
/* Remember to skip spaces. */
if (isspace (fc))
{
skip_space = 1;
continue;
}
/* Read a character. */
c = inchar ();
/* Characters other than format specs must just match. */
if (c == EOF)
input_error ();
/* We saw white space char as the last character in the format
string. Now it's time to skip all leading white space. */
if (skip_space)
{
while (isspace (c))
if (inchar () == EOF && errno == EINTR)
conv_error ();
skip_space = 0;
}
if (c != fc)
{
ungetc (c, s);
conv_error ();
}
continue;
}
/* This is the start of the conversion string. */
flags = 0;
/* Not yet decided whether we read a pointer or not. */
read_pointer = 0;
/* Initialize state of modifiers. */
argpos = 0;
/* Prepare temporary buffer. */
wpsize = 0;
/* Check for a positional parameter specification. */
if (isdigit (*f))
{
argpos = *f++ - '0';
while (isdigit (*f))
argpos = argpos * 10 + (*f++ - '0');
if (*f == '$')
++f;
else
{
/* Oops; that was actually the field width. */
width = argpos;
flags |= WIDTH;
argpos = 0;
goto got_width;
}
}
/* Check for the assignment-suppressing and the number grouping flag. */
while (*f == '*' || *f == '\'')
switch (*f++)
{
case '*':
flags |= SUPPRESS;
break;
case '\'':
flags |= GROUP;
break;
}
/* We have seen width. */
if (isdigit (*f))
flags |= WIDTH;
/* Find the maximum field width. */
width = 0;
while (isdigit (*f))
{
width *= 10;
width += *f++ - '0';
}
got_width:
if (width == 0)
width = -1;
/* Check for type modifiers. */
switch (*f++)
{
case 'h':
/* ints are short ints or chars. */
if (*f == 'h')
{
++f;
flags |= CHAR;
}
else
flags |= SHORT;
break;
case 'l':
if (*f == 'l')
{
/* A double `l' is equivalent to an `L'. */
++f;
flags |= LONGDBL;
}
else
/* ints are long ints. */
flags |= LONG;
break;
case 'q':
case 'L':
/* doubles are long doubles, and ints are long long ints. */
flags |= LONGDBL;
break;
case 'a':
/* The `a' is used as a flag only if followed by `s', `S' or
`['. */
if (*f != 's' && *f != 'S' && *f != '[')
{
--f;
break;
}
/* String conversions (%s, %[) take a `char **'
arg and fill it in with a malloc'd pointer. */
flags |= MALLOC;
break;
case 'z':
if (sizeof (size_t) > sizeof (unsigned long int))
flags |= LONGDBL;
else if (sizeof (size_t) > sizeof (unsigned int))
flags |= LONG;
break;
case 'j':
if (sizeof (uintmax_t) > sizeof (unsigned long int))
flags |= LONGDBL;
else if (sizeof (uintmax_t) > sizeof (unsigned int))
flags |= LONG;
break;
case 't':
if (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 (*f == '\0')
conv_error ();
/* Find the conversion specifier. */
fc = *f++;
if (skip_space || (fc != '[' && fc != 'c' && fc != 'C' && fc != 'n'))
{
/* Eat whitespace. */
int save_errno = errno;
errno = 0;
do
if (inchar () == EOF && errno == EINTR)
input_error ();
while (isspace (c));
errno = save_errno;
ungetc (c, s);
skip_space = 0;
}
switch (fc)
{
case '%': /* Must match a literal '%'. */
c = inchar ();
if (c == EOF)
input_error ();
if (c != fc)
{
ungetc (c, s);
conv_error ();
}
break;
case '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 (flags & LONGDBL)
*ARG (long long int *) = read_in;
else if (flags & LONG)
*ARG (long int *) = read_in;
else if (flags & SHORT)
*ARG (short int *) = read_in;
else
*ARG (int *) = 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 'c': /* Match characters. */
if ((flags & LONG) == 0)
{
if (!(flags & SUPPRESS))
{
str = ARG (char *);
if (str == NULL)
conv_error ();
}
c = inchar ();
if (c == EOF)
input_error ();
if (width == -1)
width = 1;
if (!(flags & SUPPRESS))
{
do
*str++ = c;
while (--width > 0 && inchar () != EOF);
}
else
while (--width > 0 && inchar () != EOF);
if (!(flags & SUPPRESS))
++done;
break;
}
/* FALLTHROUGH */
case 'C':
/* Get UTF-8 encoded wide character. Here we assume (as in
other parts of the libc) that we only have to handle
UTF-8. */
{
wint_t val;
size_t cnt = 0;
int first = 1;
if (!(flags & SUPPRESS))
{
wstr = ARG (wchar_t *);
if (str == NULL)
conv_error ();
}
do
{
#define NEXT_WIDE_CHAR(First) \
c = inchar (); \
if (c == EOF) \
{ \
/* EOF is only an error for the first character. */ \
if (First) \
input_error (); \
else \
break; \
} \
val = c; \
if (val >= 0x80) \
{ \
if ((c & 0xc0) == 0x80 || (c & 0xfe) == 0xfe) \
encode_error (); \
if ((c & 0xe0) == 0xc0) \
{ \
/* We expect two bytes. */ \
cnt = 1; \
val &= 0x1f; \
} \
else if ((c & 0xf0) == 0xe0) \
{ \
/* We expect three bytes. */ \
cnt = 2; \
val &= 0x0f; \
} \
else if ((c & 0xf8) == 0xf0) \
{ \
/* We expect four bytes. */ \
cnt = 3; \
val &= 0x07; \
} \
else if ((c & 0xfc) == 0xf8) \
{ \
/* We expect five bytes. */ \
cnt = 4; \
val &= 0x03; \
} \
else \
{ \
/* We expect six bytes. */ \
cnt = 5; \
val &= 0x01; \
} \
\
do \
{ \
c = inchar (); \
if (c == EOF \
|| (c & 0xc0) == 0x80 || (c & 0xfe) == 0xfe) \
encode_error (); \
val <<= 6; \
val |= c & 0x3f; \
} \
while (--cnt > 0); \
} \
\
if (!(flags & SUPPRESS)) \
*wstr++ = val; \
First = 0
NEXT_WIDE_CHAR (first);
}
while (--width > 0);
if (!(flags & SUPPRESS))
++done;
}
break;
case 's': /* Read a string. */
if (flags & LONG)
/* We have to process a wide character string. */
goto wide_char_string;
#define STRING_ARG(Str, Type) \
if (!(flags & SUPPRESS)) \
{ \
if (flags & MALLOC) \
{ \
/* The string is to be stored in a malloc'd buffer. */ \
strptr = ARG (char **); \
if (strptr == NULL) \
conv_error (); \
/* Allocate an initial buffer. */ \
strsize = 100; \
*strptr = malloc (strsize * sizeof (Type)); \
Str = (Type *) *strptr; \
} \
else \
Str = ARG (Type *); \
if (Str == NULL) \
conv_error (); \
}
STRING_ARG (str, char);
c = inchar ();
if (c == EOF)
input_error ();
do
{
if (isspace (c))
{
ungetc (c, s);
break;
}
#define STRING_ADD_CHAR(Str, c, Type) \
if (!(flags & SUPPRESS)) \
{ \
*Str++ = c; \
if ((flags & MALLOC) && (char *) Str == *strptr + strsize) \
{ \
/* Enlarge the buffer. */ \
Str = realloc (*strptr, strsize * 2 * sizeof (Type)); \
if (Str == NULL) \
{ \
/* Can't allocate that much. Last-ditch effort. */\
Str = realloc (*strptr, \
(strsize + 1) * sizeof (Type)); \
if (Str == NULL) \
{ \
/* We lose. Oh well. \
Terminate the string and stop converting, \
so at least we don't skip any input. */ \
((Type *) (*strptr))[strsize] = '\0'; \
++done; \
conv_error (); \
} \
else \
{ \
*strptr = (char *) Str; \
Str = ((Type *) *strptr) + strsize; \
++strsize; \
} \
} \
else \
{ \
*strptr = (char *) Str; \
Str = ((Type *) *strptr) + strsize; \
strsize *= 2; \
} \
} \
}
STRING_ADD_CHAR (str, c, char);
} while ((width <= 0 || --width > 0) && inchar () != EOF);
if (!(flags & SUPPRESS))
{
*str = '\0';
++done;
}
break;
case 'S':
/* Wide character string. */
wide_char_string:
{
wint_t val;
int first = 1;
STRING_ARG (wstr, wchar_t);
do
{
size_t cnt = 0;
NEXT_WIDE_CHAR (first);
if (iswspace (val))
{
/* XXX We would have to push back the whole wide char
with possibly many bytes. But since scanf does
not make a difference for white space characters
we can simply push back a simple <SP> which is
guaranteed to be in the [:space:] class. */
ungetc (' ', s);
break;
}
STRING_ADD_CHAR (wstr, val, wchar_t);
first = 0;
}
while (width <= 0 || --width > 0);
if (!(flags & SUPPRESS))
{
*wstr = L'\0';
++done;
}
}
break;
case 'x': /* Hexadecimal integer. */
case 'X': /* Ditto. */
base = 16;
number_signed = 0;
goto number;
case 'o': /* Octal integer. */
base = 8;
number_signed = 0;
goto number;
case 'u': /* Unsigned decimal integer. */
base = 10;
number_signed = 0;
goto number;
case 'd': /* Signed decimal integer. */
base = 10;
number_signed = 1;
goto number;
case 'i': /* Generic number. */
base = 0;
number_signed = 1;
number:
c = inchar ();
if (c == EOF)
input_error ();
/* Check for a sign. */
if (c == '-' || c == '+')
{
ADDW (c);
if (width > 0)
--width;
c = inchar ();
}
/* Look for a leading indication of base. */
if (width != 0 && c == '0')
{
if (width > 0)
--width;
ADDW (c);
c = inchar ();
if (width != 0 && tolower (c) == '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;
/* Read the number into workspace. */
while (c != EOF && width != 0)
{
if (base == 16 ? !isxdigit (c) :
((!isdigit (c) || c - '0' >= base) &&
!((flags & GROUP) && base == 10 && c == thousands)))
break;
ADDW (c);
if (width > 0)
--width;
c = inchar ();
}
if (wpsize == 0 ||
(wpsize == 1 && (wp[0] == '+' || wp[0] == '-')))
{
/* There was no number. If we are supposed to read a pointer
we must recognize "(nil)" as well. */
if (wpsize == 0 && read_pointer && (width < 0 || width >= 0)
&& c == '('
&& tolower (inchar ()) == 'n'
&& tolower (inchar ()) == 'i'
&& tolower (inchar ()) == 'l'
&& inchar () == ')')
/* We must produce the value of a NULL pointer. A single
'0' digit is enough. */
ADDW ('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. */
ADDW ('\0');
if (flags & LONGDBL)
{
if (number_signed)
num.q = __strtoll_internal (wp, &tw, base, flags & GROUP);
else
num.uq = __strtoull_internal (wp, &tw, base, flags & GROUP);
}
else
{
if (number_signed)
num.l = __strtol_internal (wp, &tw, base, flags & GROUP);
else
num.ul = __strtoul_internal (wp, &tw, base, flags & GROUP);
}
if (wp == tw)
conv_error ();
if (!(flags & SUPPRESS))
{
if (! number_signed)
{
if (flags & LONGDBL)
*ARG (unsigned LONGLONG int *) = num.uq;
else if (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 char *) = (unsigned char) num.ul;
else
*ARG (unsigned int *) = (unsigned int) num.ul;
}
else
{
if (flags & LONGDBL)
*ARG (LONGLONG int *) = num.q;
else if (flags & LONG)
*ARG (long int *) = num.l;
else if (flags & SHORT)
*ARG (short int *) = (short int) num.l;
else if (flags & CHAR)
*ARG (signed char *) = (signed char) num.ul;
else
*ARG (int *) = (int) num.l;
}
++done;
}
break;
case 'e': /* Floating-point numbers. */
case 'E':
case 'f':
case 'g':
case 'G':
case 'a':
case 'A':
c = inchar ();
if (c == EOF)
input_error ();
/* Check for a sign. */
if (c == '-' || c == '+')
{
negative = c == '-';
if (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) == 'n')
{
/* Maybe "nan". */
ADDW (c);
if (inchar () == EOF || tolower (c) != 'a')
input_error ();
ADDW (c);
if (inchar () == EOF || tolower (c) != 'n')
input_error ();
ADDW (c);
/* It is "nan". */
goto scan_float;
}
else if (tolower (c) == 'i')
{
/* Maybe "inf" or "infinity". */
ADDW (c);
if (inchar () == EOF || tolower (c) != 'n')
input_error ();
ADDW (c);
if (inchar () == EOF || tolower (c) != 'f')
input_error ();
ADDW (c);
/* It is as least "inf". */
if (inchar () != EOF)
{
if (tolower (c) == 'i')
{
/* No we have to read the rest as well. */
ADDW (c);
if (inchar () == EOF || tolower (c) != 'n')
input_error ();
ADDW (c);
if (inchar () == EOF || tolower (c) != 'i')
input_error ();
ADDW (c);
if (inchar () == EOF || tolower (c) != 't')
input_error ();
ADDW (c);
if (inchar () == EOF || tolower (c) != 'y')
input_error ();
ADDW (c);
}
else
/* Never mind. */
ungetc (c, s);
}
goto scan_float;
}
is_hexa = 0;
exp_char = 'e';
if (c == '0')
{
ADDW (c);
c = inchar ();
if (tolower (c) == 'x')
{
/* It is a number in hexadecimal format. */
ADDW (c);
is_hexa = 1;
exp_char = 'p';
/* Grouping is not allowed. */
flags &= ~GROUP;
c = inchar ();
}
}
got_dot = got_e = 0;
do
{
if (isdigit (c))
ADDW (c);
else if (!got_e && is_hexa && isxdigit (c))
ADDW (c);
else if (got_e && wp[wpsize - 1] == exp_char
&& (c == '-' || c == '+'))
ADDW (c);
else if (wpsize > 0 && !got_e && tolower (c) == exp_char)
{
ADDW (exp_char);
got_e = got_dot = 1;
}
else if (c == decimal && !got_dot)
{
ADDW (c);
got_dot = 1;
}
else if ((flags & GROUP) && c == thousands && !got_dot)
ADDW (c);
else
{
/* The last read character is not part of the number
anymore. */
ungetc (c, s);
break;
}
if (width > 0)
--width;
}
while (width != 0 && inchar () != EOF);
/* 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 (wpsize == 0 || (is_hexa && wpsize == 2))
conv_error ();
scan_float:
/* Convert the number. */
ADDW ('\0');
if (flags & LONGDBL)
{
long double d = __strtold_internal (wp, &tw, flags & GROUP);
if (!(flags & SUPPRESS) && tw != wp)
*ARG (long double *) = negative ? -d : d;
}
else if (flags & LONG)
{
double d = __strtod_internal (wp, &tw, flags & GROUP);
if (!(flags & SUPPRESS) && tw != wp)
*ARG (double *) = negative ? -d : d;
}
else
{
float d = __strtof_internal (wp, &tw, flags & GROUP);
if (!(flags & SUPPRESS) && tw != wp)
*ARG (float *) = negative ? -d : d;
}
if (tw == wp)
conv_error ();
if (!(flags & SUPPRESS))
++done;
break;
case '[': /* Character class. */
if (flags & LONG)
{
STRING_ARG (wstr, wchar_t);
c = '\0'; /* This is to keep gcc quiet. */
}
else
{
STRING_ARG (str, char);
c = inchar ();
if (c == EOF)
input_error ();
}
if (*f == '^')
{
++f;
not_in = 1;
}
else
not_in = 0;
/* Fill WP with byte flags indexed by character.
We will use this flag map for matching input characters. */
if (wpmax < UCHAR_MAX)
{
wpmax = UCHAR_MAX;
wp = (char *) alloca (wpmax);
}
memset (wp, 0, UCHAR_MAX);
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. */
wp[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 = f[-2]; fc < *f; ++fc)
wp[fc] = 1;
}
else
/* Add the character to the flag map. */
wp[fc] = 1;
}
if (fc == '\0')
{
if (!(flags & LONG))
ungetc (c, s);
conv_error();
}
if (flags & LONG)
{
wint_t val;
int first = 1;
do
{
size_t cnt = 0;
NEXT_WIDE_CHAR (first);
if (val <= 255 && wp[val] == not_in)
{
ungetc (val, s);
break;
}
STRING_ADD_CHAR (wstr, val, wchar_t);
if (width > 0)
--width;
first = 0;
}
while (width != 0);
if (first)
conv_error ();
if (!(flags & SUPPRESS))
{
*wstr = L'\0';
++done;
}
}
else
{
num.ul = read_in - 1; /* -1 because we already read one char. */
do
{
if (wp[c] == not_in)
{
ungetc (c, s);
break;
}
STRING_ADD_CHAR (str, c, char);
if (width > 0)
--width;
}
while (width != 0 && inchar () != EOF);
if (read_in == num.ul)
conv_error ();
if (!(flags & SUPPRESS))
{
*str = '\0';
++done;
}
}
break;
case 'p': /* Generic pointer. */
base = 16;
/* A PTR must be the same size as a `long int'. */
flags &= ~(SHORT|LONGDBL);
flags |= LONG;
number_signed = 0;
read_pointer = 1;
goto number;
}
}
/* 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);
}
/* Unlock stream. */
UNLOCK_STREAM (s);
return done;
}
#ifdef USE_IN_LIBIO
int
__vfscanf (FILE *s, const char *format, va_list argptr)
{
return _IO_vfscanf (s, format, argptr, NULL);
}
#endif
weak_alias (__vfscanf, vfscanf)
Reference in New Issue View Git Blame Copy Permalink