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glibc/stdio-common/vfprintf-internal.c
Joseph Myers 6caddd34bd Remove most vfprintf width/precision-dependent allocations (bug 14231, bug 26211). 
The vfprintf implementation (used for all printf-family functions)
contains complicated logic to allocate internal buffers of a size
depending on the width and precision used for a format, using either
malloc or alloca depending on that size, and with consequent checks
for size overflow and allocation failure.

As noted in bug 26211, the version of that logic used when '$' plus
argument number formats are in use is missing the overflow checks,
which can result in segfaults (quite possibly exploitable, I didn't
try to work that out) when the width or precision is in the range
0x7fffffe0 through 0x7fffffff (maybe smaller values as well in the
wprintf case on 32-bit systems, when the multiplication by sizeof
(CHAR_T) can overflow).

All that complicated logic in fact appears to be useless.  As far as I
can tell, there has been no need (outside the floating-point printf
code, which does its own allocations) for allocations depending on
width or precision since commit
3e95f6602b ("Remove limitation on size
of precision for integers", Sun Sep 12 21:23:32 1999 +0000).  Thus,
this patch removes that logic completely, thereby fixing both problems
with excessive allocations for large width and precision for
non-floating-point formats, and the problem with missing overflow
checks with such allocations.  Note that this does have the
consequence that width and precision up to INT_MAX are now allowed
where previously INT_MAX / sizeof (CHAR_T) - EXTSIZ or more would have
been rejected, so could potentially expose any other overflows where
the value would previously have been rejected by those removed checks.

I believe this completely fixes bugs 14231 and 26211.

Excessive allocations are still possible in the floating-point case
(bug 21127), as are other integer or buffer overflows (see bug 26201).
This does not address the cases where a precision larger than INT_MAX
(embedded in the format string) would be meaningful without printf's
return value overflowing (when it's used with a string format, or %g
without the '#' flag, so the actual output will be much smaller), as
mentioned in bug 17829 comment 8; using size_t internally for
precision to handle that case would be complicated by struct
printf_info being a public ABI.  Nor does it address the matter of an
INT_MIN width being negated (bug 17829 comment 7; the same logic
appears a second time in the file as well, in the form of multiplying
by -1).  There may be other sources of memory allocations with malloc
in printf functions as well (bug 24988, bug 16060).  From inspection,
I think there are also integer overflows in two copies of "if ((width
-= len) < 0)" logic (where width is int, len is size_t and a very long
string could result in spurious padding being output on a 32-bit
system before printf overflows the count of output characters).

Tested for x86-64 and x86.
2020-07-07 14:54:12 +00:00

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/* Copyright (C) 1991-2020 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
<https://www.gnu.org/licenses/>. */
#include <array_length.h>
#include <ctype.h>
#include <limits.h>
#include <printf.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <wchar.h>
#include <libc-lock.h>
#include <sys/param.h>
#include <_itoa.h>
#include <locale/localeinfo.h>
#include <stdio.h>
#include <scratch_buffer.h>
#include <intprops.h>
/* This code is shared between the standard stdio implementation found
in GNU C library and the libio implementation originally found in
GNU libg++.
Beside this it is also shared between the normal and wide character
implementation as defined in ISO/IEC 9899:1990/Amendment 1:1995. */
#include <libioP.h>
#ifdef COMPILE_WPRINTF
#include <wctype.h>
#endif
#define ARGCHECK(S, Format) \
do \
{ \
/* Check file argument for consistence. */ \
CHECK_FILE (S, -1); \
if (S->_flags & _IO_NO_WRITES) \
{ \
S->_flags |= _IO_ERR_SEEN; \
__set_errno (EBADF); \
return -1; \
} \
if (Format == NULL) \
{ \
__set_errno (EINVAL); \
return -1; \
} \
} while (0)
#define UNBUFFERED_P(S) ((S)->_flags & _IO_UNBUFFERED)
#if __HAVE_FLOAT128_UNLIKE_LDBL
# define PARSE_FLOAT_VA_ARG_EXTENDED(INFO) \
do \
{ \
if (is_long_double \
&& (mode_flags & PRINTF_LDBL_USES_FLOAT128) != 0) \
{ \
INFO.is_binary128 = 1; \
the_arg.pa_float128 = va_arg (ap, _Float128); \
} \
else \
{ \
PARSE_FLOAT_VA_ARG (INFO); \
} \
} \
while (0)
#else
# define PARSE_FLOAT_VA_ARG_EXTENDED(INFO) \
PARSE_FLOAT_VA_ARG (INFO);
#endif
#define PARSE_FLOAT_VA_ARG(INFO) \
do \
{ \
INFO.is_binary128 = 0; \
if (is_long_double) \
the_arg.pa_long_double = va_arg (ap, long double); \
else \
the_arg.pa_double = va_arg (ap, double); \
} \
while (0)
#if __HAVE_FLOAT128_UNLIKE_LDBL
# define SETUP_FLOAT128_INFO(INFO) \
do \
{ \
if ((mode_flags & PRINTF_LDBL_USES_FLOAT128) != 0) \
INFO.is_binary128 = is_long_double; \
else \
INFO.is_binary128 = 0; \
} \
while (0)
#else
# define SETUP_FLOAT128_INFO(INFO) \
do \
{ \
INFO.is_binary128 = 0; \
} \
while (0)
#endif
/* Add LENGTH to DONE. Return the new value of DONE, or -1 on
overflow (and set errno accordingly). */
static inline int
done_add_func (size_t length, int done)
{
if (done < 0)
return done;
int ret;
if (INT_ADD_WRAPV (done, length, &ret))
{
__set_errno (EOVERFLOW);
return -1;
}
return ret;
}
#define done_add(val) \
do \
{ \
/* Ensure that VAL has a type similar to int. */ \
_Static_assert (sizeof (val) == sizeof (int), "value int size"); \
_Static_assert ((__typeof__ (val)) -1 < 0, "value signed"); \
done = done_add_func ((val), done); \
if (done < 0) \
goto all_done; \
} \
while (0)
#ifndef COMPILE_WPRINTF
# define vfprintf __vfprintf_internal
# define CHAR_T char
# define OTHER_CHAR_T wchar_t
# define UCHAR_T unsigned char
# define INT_T int
typedef const char *THOUSANDS_SEP_T;
# define L_(Str) Str
# define ISDIGIT(Ch) ((unsigned int) ((Ch) - '0') < 10)
# define STR_LEN(Str) strlen (Str)
# define PUT(F, S, N) _IO_sputn ((F), (S), (N))
# define PUTC(C, F) _IO_putc_unlocked (C, F)
# define ORIENT if (_IO_vtable_offset (s) == 0 && _IO_fwide (s, -1) != -1)\
return -1
# define CONVERT_FROM_OTHER_STRING __wcsrtombs
#else
# define vfprintf __vfwprintf_internal
# define CHAR_T wchar_t
# define OTHER_CHAR_T char
/* This is a hack!!! There should be a type uwchar_t. */
# define UCHAR_T unsigned int /* uwchar_t */
# define INT_T wint_t
typedef wchar_t THOUSANDS_SEP_T;
# define L_(Str) L##Str
# define ISDIGIT(Ch) ((unsigned int) ((Ch) - L'0') < 10)
# define STR_LEN(Str) __wcslen (Str)
# include <_itowa.h>
# define PUT(F, S, N) _IO_sputn ((F), (S), (N))
# define PUTC(C, F) _IO_putwc_unlocked (C, F)
# define ORIENT if (_IO_fwide (s, 1) != 1) return -1
# define CONVERT_FROM_OTHER_STRING __mbsrtowcs
# undef _itoa
# define _itoa(Val, Buf, Base, Case) _itowa (Val, Buf, Base, Case)
# define _itoa_word(Val, Buf, Base, Case) _itowa_word (Val, Buf, Base, Case)
# undef EOF
# define EOF WEOF
#endif
static inline int
pad_func (FILE *s, CHAR_T padchar, int width, int done)
{
if (width > 0)
{
ssize_t written;
#ifndef COMPILE_WPRINTF
written = _IO_padn (s, padchar, width);
#else
written = _IO_wpadn (s, padchar, width);
#endif
if (__glibc_unlikely (written != width))
return -1;
return done_add_func (width, done);
}
return done;
}
#define PAD(Padchar) \
do \
{ \
done = pad_func (s, (Padchar), width, done); \
if (done < 0) \
goto all_done; \
} \
while (0)
#include "_i18n_number.h"
/* Include the shared code for parsing the format string. */
#include "printf-parse.h"
#define outchar(Ch) \
do \
{ \
const INT_T outc = (Ch); \
if (PUTC (outc, s) == EOF || done == INT_MAX) \
{ \
done = -1; \
goto all_done; \
} \
++done; \
} \
while (0)
static inline int
outstring_func (FILE *s, const UCHAR_T *string, size_t length, int done)
{
assert ((size_t) done <= (size_t) INT_MAX);
if ((size_t) PUT (s, string, length) != (size_t) (length))
return -1;
return done_add_func (length, done);
}
#define outstring(String, Len) \
do \
{ \
const void *string_ = (String); \
done = outstring_func (s, string_, (Len), done); \
if (done < 0) \
goto all_done; \
} \
while (0)
/* Write the string SRC to S. If PREC is non-negative, write at most
PREC bytes. If LEFT is true, perform left justification. */
static int
outstring_converted_wide_string (FILE *s, const OTHER_CHAR_T *src, int prec,
int width, bool left, int done)
{
/* Use a small buffer to combine processing of multiple characters.
CONVERT_FROM_OTHER_STRING expects the buffer size in (wide)
characters, and buf_length counts that. */
enum { buf_length = 256 / sizeof (CHAR_T) };
CHAR_T buf[buf_length];
_Static_assert (sizeof (buf) > MB_LEN_MAX,
"buffer is large enough for a single multi-byte character");
/* Add the initial padding if needed. */
if (width > 0 && !left)
{
/* Make a first pass to find the output width, so that we can
add the required padding. */
mbstate_t mbstate = { 0 };
const OTHER_CHAR_T *src_copy = src;
size_t total_written;
if (prec < 0)
total_written = CONVERT_FROM_OTHER_STRING
(NULL, &src_copy, 0, &mbstate);
else
{
/* The source might not be null-terminated. Enforce the
limit manually, based on the output length. */
total_written = 0;
size_t limit = prec;
while (limit > 0 && src_copy != NULL)
{
size_t write_limit = buf_length;
if (write_limit > limit)
write_limit = limit;
size_t written = CONVERT_FROM_OTHER_STRING
(buf, &src_copy, write_limit, &mbstate);
if (written == (size_t) -1)
return -1;
if (written == 0)
break;
total_written += written;
limit -= written;
}
}
/* Output initial padding. */
if (total_written < width)
{
done = pad_func (s, L_(' '), width - total_written, done);
if (done < 0)
return done;
}
}
/* Convert the input string, piece by piece. */
size_t total_written = 0;
{
mbstate_t mbstate = { 0 };
/* If prec is negative, remaining is not decremented, otherwise,
it serves as the write limit. */
size_t remaining = -1;
if (prec >= 0)
remaining = prec;
while (remaining > 0 && src != NULL)
{
size_t write_limit = buf_length;
if (remaining < write_limit)
write_limit = remaining;
size_t written = CONVERT_FROM_OTHER_STRING
(buf, &src, write_limit, &mbstate);
if (written == (size_t) -1)
return -1;
if (written == 0)
break;
done = outstring_func (s, (const UCHAR_T *) buf, written, done);
if (done < 0)
return done;
total_written += written;
if (prec >= 0)
remaining -= written;
}
}
/* Add final padding. */
if (width > 0 && left && total_written < width)
return pad_func (s, L_(' '), width - total_written, done);
return done;
}
/* For handling long_double and longlong we use the same flag. If
`long' and `long long' are effectively the same type define it to
zero. */
#if LONG_MAX == LONG_LONG_MAX
# define is_longlong 0
#else
# define is_longlong is_long_double
#endif
/* If `long' and `int' is effectively the same type we don't have to
handle `long separately. */
#if INT_MAX == LONG_MAX
# define is_long_num 0
#else
# define is_long_num is_long
#endif
/* Global constants. */
static const CHAR_T null[] = L_("(null)");
/* Size of the work_buffer variable (in characters, not bytes. */
enum { WORK_BUFFER_SIZE = 1000 / sizeof (CHAR_T) };
/* This table maps a character into a number representing a class. In
each step there is a destination label for each class. */
static const uint8_t jump_table[] =
{
/* ' ' */ 1, 0, 0, /* '#' */ 4,
0, /* '%' */ 14, 0, /* '\''*/ 6,
0, 0, /* '*' */ 7, /* '+' */ 2,
0, /* '-' */ 3, /* '.' */ 9, 0,
/* '0' */ 5, /* '1' */ 8, /* '2' */ 8, /* '3' */ 8,
/* '4' */ 8, /* '5' */ 8, /* '6' */ 8, /* '7' */ 8,
/* '8' */ 8, /* '9' */ 8, 0, 0,
0, 0, 0, 0,
0, /* 'A' */ 26, 0, /* 'C' */ 25,
0, /* 'E' */ 19, /* F */ 19, /* 'G' */ 19,
0, /* 'I' */ 29, 0, 0,
/* 'L' */ 12, 0, 0, 0,
0, 0, 0, /* 'S' */ 21,
0, 0, 0, 0,
/* 'X' */ 18, 0, /* 'Z' */ 13, 0,
0, 0, 0, 0,
0, /* 'a' */ 26, 0, /* 'c' */ 20,
/* 'd' */ 15, /* 'e' */ 19, /* 'f' */ 19, /* 'g' */ 19,
/* 'h' */ 10, /* 'i' */ 15, /* 'j' */ 28, 0,
/* 'l' */ 11, /* 'm' */ 24, /* 'n' */ 23, /* 'o' */ 17,
/* 'p' */ 22, /* 'q' */ 12, 0, /* 's' */ 21,
/* 't' */ 27, /* 'u' */ 16, 0, 0,
/* 'x' */ 18, 0, /* 'z' */ 13
};
#define NOT_IN_JUMP_RANGE(Ch) ((Ch) < L_(' ') || (Ch) > L_('z'))
#define CHAR_CLASS(Ch) (jump_table[(INT_T) (Ch) - L_(' ')])
#define LABEL(Name) do_##Name
#ifdef SHARED
/* 'int' is enough and it saves some space on 64 bit systems. */
# define JUMP_TABLE_TYPE const int
# define JUMP_TABLE_BASE_LABEL do_form_unknown
# define REF(Name) &&do_##Name - &&JUMP_TABLE_BASE_LABEL
# define JUMP(ChExpr, table) \
do \
{ \
int offset; \
void *ptr; \
spec = (ChExpr); \
offset = NOT_IN_JUMP_RANGE (spec) ? REF (form_unknown) \
: table[CHAR_CLASS (spec)]; \
ptr = &&JUMP_TABLE_BASE_LABEL + offset; \
goto *ptr; \
} \
while (0)
#else
# define JUMP_TABLE_TYPE const void *const
# define REF(Name) &&do_##Name
# define JUMP(ChExpr, table) \
do \
{ \
const void *ptr; \
spec = (ChExpr); \
ptr = NOT_IN_JUMP_RANGE (spec) ? REF (form_unknown) \
: table[CHAR_CLASS (spec)]; \
goto *ptr; \
} \
while (0)
#endif
#define STEP0_3_TABLE \
/* Step 0: at the beginning. */ \
static JUMP_TABLE_TYPE step0_jumps[30] = \
{ \
REF (form_unknown), \
REF (flag_space), /* for ' ' */ \
REF (flag_plus), /* for '+' */ \
REF (flag_minus), /* for '-' */ \
REF (flag_hash), /* for '<hash>' */ \
REF (flag_zero), /* for '0' */ \
REF (flag_quote), /* for '\'' */ \
REF (width_asterics), /* for '*' */ \
REF (width), /* for '1'...'9' */ \
REF (precision), /* for '.' */ \
REF (mod_half), /* for 'h' */ \
REF (mod_long), /* for 'l' */ \
REF (mod_longlong), /* for 'L', 'q' */ \
REF (mod_size_t), /* for 'z', 'Z' */ \
REF (form_percent), /* for '%' */ \
REF (form_integer), /* for 'd', 'i' */ \
REF (form_unsigned), /* for 'u' */ \
REF (form_octal), /* for 'o' */ \
REF (form_hexa), /* for 'X', 'x' */ \
REF (form_float), /* for 'E', 'e', 'F', 'f', 'G', 'g' */ \
REF (form_character), /* for 'c' */ \
REF (form_string), /* for 's', 'S' */ \
REF (form_pointer), /* for 'p' */ \
REF (form_number), /* for 'n' */ \
REF (form_strerror), /* for 'm' */ \
REF (form_wcharacter), /* for 'C' */ \
REF (form_floathex), /* for 'A', 'a' */ \
REF (mod_ptrdiff_t), /* for 't' */ \
REF (mod_intmax_t), /* for 'j' */ \
REF (flag_i18n), /* for 'I' */ \
}; \
/* Step 1: after processing width. */ \
static JUMP_TABLE_TYPE step1_jumps[30] = \
{ \
REF (form_unknown), \
REF (form_unknown), /* for ' ' */ \
REF (form_unknown), /* for '+' */ \
REF (form_unknown), /* for '-' */ \
REF (form_unknown), /* for '<hash>' */ \
REF (form_unknown), /* for '0' */ \
REF (form_unknown), /* for '\'' */ \
REF (form_unknown), /* for '*' */ \
REF (form_unknown), /* for '1'...'9' */ \
REF (precision), /* for '.' */ \
REF (mod_half), /* for 'h' */ \
REF (mod_long), /* for 'l' */ \
REF (mod_longlong), /* for 'L', 'q' */ \
REF (mod_size_t), /* for 'z', 'Z' */ \
REF (form_percent), /* for '%' */ \
REF (form_integer), /* for 'd', 'i' */ \
REF (form_unsigned), /* for 'u' */ \
REF (form_octal), /* for 'o' */ \
REF (form_hexa), /* for 'X', 'x' */ \
REF (form_float), /* for 'E', 'e', 'F', 'f', 'G', 'g' */ \
REF (form_character), /* for 'c' */ \
REF (form_string), /* for 's', 'S' */ \
REF (form_pointer), /* for 'p' */ \
REF (form_number), /* for 'n' */ \
REF (form_strerror), /* for 'm' */ \
REF (form_wcharacter), /* for 'C' */ \
REF (form_floathex), /* for 'A', 'a' */ \
REF (mod_ptrdiff_t), /* for 't' */ \
REF (mod_intmax_t), /* for 'j' */ \
REF (form_unknown) /* for 'I' */ \
}; \
/* Step 2: after processing precision. */ \
static JUMP_TABLE_TYPE step2_jumps[30] = \
{ \
REF (form_unknown), \
REF (form_unknown), /* for ' ' */ \
REF (form_unknown), /* for '+' */ \
REF (form_unknown), /* for '-' */ \
REF (form_unknown), /* for '<hash>' */ \
REF (form_unknown), /* for '0' */ \
REF (form_unknown), /* for '\'' */ \
REF (form_unknown), /* for '*' */ \
REF (form_unknown), /* for '1'...'9' */ \
REF (form_unknown), /* for '.' */ \
REF (mod_half), /* for 'h' */ \
REF (mod_long), /* for 'l' */ \
REF (mod_longlong), /* for 'L', 'q' */ \
REF (mod_size_t), /* for 'z', 'Z' */ \
REF (form_percent), /* for '%' */ \
REF (form_integer), /* for 'd', 'i' */ \
REF (form_unsigned), /* for 'u' */ \
REF (form_octal), /* for 'o' */ \
REF (form_hexa), /* for 'X', 'x' */ \
REF (form_float), /* for 'E', 'e', 'F', 'f', 'G', 'g' */ \
REF (form_character), /* for 'c' */ \
REF (form_string), /* for 's', 'S' */ \
REF (form_pointer), /* for 'p' */ \
REF (form_number), /* for 'n' */ \
REF (form_strerror), /* for 'm' */ \
REF (form_wcharacter), /* for 'C' */ \
REF (form_floathex), /* for 'A', 'a' */ \
REF (mod_ptrdiff_t), /* for 't' */ \
REF (mod_intmax_t), /* for 'j' */ \
REF (form_unknown) /* for 'I' */ \
}; \
/* Step 3a: after processing first 'h' modifier. */ \
static JUMP_TABLE_TYPE step3a_jumps[30] = \
{ \
REF (form_unknown), \
REF (form_unknown), /* for ' ' */ \
REF (form_unknown), /* for '+' */ \
REF (form_unknown), /* for '-' */ \
REF (form_unknown), /* for '<hash>' */ \
REF (form_unknown), /* for '0' */ \
REF (form_unknown), /* for '\'' */ \
REF (form_unknown), /* for '*' */ \
REF (form_unknown), /* for '1'...'9' */ \
REF (form_unknown), /* for '.' */ \
REF (mod_halfhalf), /* for 'h' */ \
REF (form_unknown), /* for 'l' */ \
REF (form_unknown), /* for 'L', 'q' */ \
REF (form_unknown), /* for 'z', 'Z' */ \
REF (form_percent), /* for '%' */ \
REF (form_integer), /* for 'd', 'i' */ \
REF (form_unsigned), /* for 'u' */ \
REF (form_octal), /* for 'o' */ \
REF (form_hexa), /* for 'X', 'x' */ \
REF (form_unknown), /* for 'E', 'e', 'F', 'f', 'G', 'g' */ \
REF (form_unknown), /* for 'c' */ \
REF (form_unknown), /* for 's', 'S' */ \
REF (form_unknown), /* for 'p' */ \
REF (form_number), /* for 'n' */ \
REF (form_unknown), /* for 'm' */ \
REF (form_unknown), /* for 'C' */ \
REF (form_unknown), /* for 'A', 'a' */ \
REF (form_unknown), /* for 't' */ \
REF (form_unknown), /* for 'j' */ \
REF (form_unknown) /* for 'I' */ \
}; \
/* Step 3b: after processing first 'l' modifier. */ \
static JUMP_TABLE_TYPE step3b_jumps[30] = \
{ \
REF (form_unknown), \
REF (form_unknown), /* for ' ' */ \
REF (form_unknown), /* for '+' */ \
REF (form_unknown), /* for '-' */ \
REF (form_unknown), /* for '<hash>' */ \
REF (form_unknown), /* for '0' */ \
REF (form_unknown), /* for '\'' */ \
REF (form_unknown), /* for '*' */ \
REF (form_unknown), /* for '1'...'9' */ \
REF (form_unknown), /* for '.' */ \
REF (form_unknown), /* for 'h' */ \
REF (mod_longlong), /* for 'l' */ \
REF (form_unknown), /* for 'L', 'q' */ \
REF (form_unknown), /* for 'z', 'Z' */ \
REF (form_percent), /* for '%' */ \
REF (form_integer), /* for 'd', 'i' */ \
REF (form_unsigned), /* for 'u' */ \
REF (form_octal), /* for 'o' */ \
REF (form_hexa), /* for 'X', 'x' */ \
REF (form_float), /* for 'E', 'e', 'F', 'f', 'G', 'g' */ \
REF (form_character), /* for 'c' */ \
REF (form_string), /* for 's', 'S' */ \
REF (form_pointer), /* for 'p' */ \
REF (form_number), /* for 'n' */ \
REF (form_strerror), /* for 'm' */ \
REF (form_wcharacter), /* for 'C' */ \
REF (form_floathex), /* for 'A', 'a' */ \
REF (form_unknown), /* for 't' */ \
REF (form_unknown), /* for 'j' */ \
REF (form_unknown) /* for 'I' */ \
}
#define STEP4_TABLE \
/* Step 4: processing format specifier. */ \
static JUMP_TABLE_TYPE step4_jumps[30] = \
{ \
REF (form_unknown), \
REF (form_unknown), /* for ' ' */ \
REF (form_unknown), /* for '+' */ \
REF (form_unknown), /* for '-' */ \
REF (form_unknown), /* for '<hash>' */ \
REF (form_unknown), /* for '0' */ \
REF (form_unknown), /* for '\'' */ \
REF (form_unknown), /* for '*' */ \
REF (form_unknown), /* for '1'...'9' */ \
REF (form_unknown), /* for '.' */ \
REF (form_unknown), /* for 'h' */ \
REF (form_unknown), /* for 'l' */ \
REF (form_unknown), /* for 'L', 'q' */ \
REF (form_unknown), /* for 'z', 'Z' */ \
REF (form_percent), /* for '%' */ \
REF (form_integer), /* for 'd', 'i' */ \
REF (form_unsigned), /* for 'u' */ \
REF (form_octal), /* for 'o' */ \
REF (form_hexa), /* for 'X', 'x' */ \
REF (form_float), /* for 'E', 'e', 'F', 'f', 'G', 'g' */ \
REF (form_character), /* for 'c' */ \
REF (form_string), /* for 's', 'S' */ \
REF (form_pointer), /* for 'p' */ \
REF (form_number), /* for 'n' */ \
REF (form_strerror), /* for 'm' */ \
REF (form_wcharacter), /* for 'C' */ \
REF (form_floathex), /* for 'A', 'a' */ \
REF (form_unknown), /* for 't' */ \
REF (form_unknown), /* for 'j' */ \
REF (form_unknown) /* for 'I' */ \
}
#define process_arg(fspec) \
/* Start real work. We know about all flags and modifiers and \
now process the wanted format specifier. */ \
LABEL (form_percent): \
/* Write a literal "%". */ \
outchar (L_('%')); \
break; \
\
LABEL (form_integer): \
/* Signed decimal integer. */ \
base = 10; \
\
if (is_longlong) \
{ \
long long int signed_number; \
\
if (fspec == NULL) \
signed_number = va_arg (ap, long long int); \
else \
signed_number = args_value[fspec->data_arg].pa_long_long_int; \
\
is_negative = signed_number < 0; \
number.longlong = is_negative ? (- signed_number) : signed_number; \
\
goto LABEL (longlong_number); \
} \
else \
{ \
long int signed_number; \
\
if (fspec == NULL) \
{ \
if (is_long_num) \
signed_number = va_arg (ap, long int); \
else if (is_char) \
signed_number = (signed char) va_arg (ap, unsigned int); \
else if (!is_short) \
signed_number = va_arg (ap, int); \
else \
signed_number = (short int) va_arg (ap, unsigned int); \
} \
else \
if (is_long_num) \
signed_number = args_value[fspec->data_arg].pa_long_int; \
else if (is_char) \
signed_number = (signed char) \
args_value[fspec->data_arg].pa_u_int; \
else if (!is_short) \
signed_number = args_value[fspec->data_arg].pa_int; \
else \
signed_number = (short int) \
args_value[fspec->data_arg].pa_u_int; \
\
is_negative = signed_number < 0; \
number.word = is_negative ? (- signed_number) : signed_number; \
\
goto LABEL (number); \
} \
/* NOTREACHED */ \
\
LABEL (form_unsigned): \
/* Unsigned decimal integer. */ \
base = 10; \
goto LABEL (unsigned_number); \
/* NOTREACHED */ \
\
LABEL (form_octal): \
/* Unsigned octal integer. */ \
base = 8; \
goto LABEL (unsigned_number); \
/* NOTREACHED */ \
\
LABEL (form_hexa): \
/* Unsigned hexadecimal integer. */ \
base = 16; \
\
LABEL (unsigned_number): /* Unsigned number of base BASE. */ \
\
/* ISO specifies the `+' and ` ' flags only for signed \
conversions. */ \
is_negative = 0; \
showsign = 0; \
space = 0; \
\
if (is_longlong) \
{ \
if (fspec == NULL) \
number.longlong = va_arg (ap, unsigned long long int); \
else \
number.longlong = args_value[fspec->data_arg].pa_u_long_long_int; \
\
LABEL (longlong_number): \
if (prec < 0) \
/* Supply a default precision if none was given. */ \
prec = 1; \
else \
/* We have to take care for the '0' flag. If a precision \
is given it must be ignored. */ \
pad = L_(' '); \
\
/* If the precision is 0 and the number is 0 nothing has to \
be written for the number, except for the 'o' format in \
alternate form. */ \
if (prec == 0 && number.longlong == 0) \
{ \
string = workend; \
if (base == 8 && alt) \
*--string = L_('0'); \
} \
else \
{ \
/* Put the number in WORK. */ \
string = _itoa (number.longlong, workend, base, \
spec == L_('X')); \
if (group && grouping) \
string = group_number (work_buffer, string, workend, \
grouping, thousands_sep); \
if (use_outdigits && base == 10) \
string = _i18n_number_rewrite (string, workend, workend); \
} \
/* Simplify further test for num != 0. */ \
number.word = number.longlong != 0; \
} \
else \
{ \
if (fspec == NULL) \
{ \
if (is_long_num) \
number.word = va_arg (ap, unsigned long int); \
else if (is_char) \
number.word = (unsigned char) va_arg (ap, unsigned int); \
else if (!is_short) \
number.word = va_arg (ap, unsigned int); \
else \
number.word = (unsigned short int) va_arg (ap, unsigned int); \
} \
else \
if (is_long_num) \
number.word = args_value[fspec->data_arg].pa_u_long_int; \
else if (is_char) \
number.word = (unsigned char) \
args_value[fspec->data_arg].pa_u_int; \
else if (!is_short) \
number.word = args_value[fspec->data_arg].pa_u_int; \
else \
number.word = (unsigned short int) \
args_value[fspec->data_arg].pa_u_int; \
\
LABEL (number): \
if (prec < 0) \
/* Supply a default precision if none was given. */ \
prec = 1; \
else \
/* We have to take care for the '0' flag. If a precision \
is given it must be ignored. */ \
pad = L_(' '); \
\
/* If the precision is 0 and the number is 0 nothing has to \
be written for the number, except for the 'o' format in \
alternate form. */ \
if (prec == 0 && number.word == 0) \
{ \
string = workend; \
if (base == 8 && alt) \
*--string = L_('0'); \
} \
else \
{ \
/* Put the number in WORK. */ \
string = _itoa_word (number.word, workend, base, \
spec == L_('X')); \
if (group && grouping) \
string = group_number (work_buffer, string, workend, \
grouping, thousands_sep); \
if (use_outdigits && base == 10) \
string = _i18n_number_rewrite (string, workend, workend); \
} \
} \
\
if (prec <= workend - string && number.word != 0 && alt && base == 8) \
/* Add octal marker. */ \
*--string = L_('0'); \
\
prec = MAX (0, prec - (workend - string)); \
\
if (!left) \
{ \
width -= workend - string + prec; \
\
if (number.word != 0 && alt && base == 16) \
/* Account for 0X hex marker. */ \
width -= 2; \
\
if (is_negative || showsign || space) \
--width; \
\
if (pad == L_(' ')) \
{ \
PAD (L_(' ')); \
width = 0; \
} \
\
if (is_negative) \
outchar (L_('-')); \
else if (showsign) \
outchar (L_('+')); \
else if (space) \
outchar (L_(' ')); \
\
if (number.word != 0 && alt && base == 16) \
{ \
outchar (L_('0')); \
outchar (spec); \
} \
\
width += prec; \
PAD (L_('0')); \
\
outstring (string, workend - string); \
\
break; \
} \
else \
{ \
if (is_negative) \
{ \
outchar (L_('-')); \
--width; \
} \
else if (showsign) \
{ \
outchar (L_('+')); \
--width; \
} \
else if (space) \
{ \
outchar (L_(' ')); \
--width; \
} \
\
if (number.word != 0 && alt && base == 16) \
{ \
outchar (L_('0')); \
outchar (spec); \
width -= 2; \
} \
\
width -= workend - string + prec; \
\
if (prec > 0) \
{ \
int temp = width; \
width = prec; \
PAD (L_('0')); \
width = temp; \
} \
\
outstring (string, workend - string); \
\
PAD (L_(' ')); \
break; \
} \
\
LABEL (form_float): \
{ \
/* Floating-point number. This is handled by printf_fp.c. */ \
const void *ptr; \
int function_done; \
\
if (fspec == NULL) \
{ \
if (__glibc_unlikely ((mode_flags & PRINTF_LDBL_IS_DBL) != 0)) \
is_long_double = 0; \
\
struct printf_info info = { .prec = prec, \
.width = width, \
.spec = spec, \
.is_long_double = is_long_double, \
.is_short = is_short, \
.is_long = is_long, \
.alt = alt, \
.space = space, \
.left = left, \
.showsign = showsign, \
.group = group, \
.pad = pad, \
.extra = 0, \
.i18n = use_outdigits, \
.wide = sizeof (CHAR_T) != 1, \
.is_binary128 = 0}; \
\
PARSE_FLOAT_VA_ARG_EXTENDED (info); \
ptr = (const void *) &the_arg; \
\
function_done = __printf_fp (s, &info, &ptr); \
} \
else \
{ \
ptr = (const void *) &args_value[fspec->data_arg]; \
if (__glibc_unlikely ((mode_flags & PRINTF_LDBL_IS_DBL) != 0)) \
{ \
fspec->data_arg_type = PA_DOUBLE; \
fspec->info.is_long_double = 0; \
} \
SETUP_FLOAT128_INFO (fspec->info); \
\
function_done = __printf_fp (s, &fspec->info, &ptr); \
} \
\
if (function_done < 0) \
{ \
/* Error in print handler; up to handler to set errno. */ \
done = -1; \
goto all_done; \
} \
\
done_add (function_done); \
} \
break; \
\
LABEL (form_floathex): \
{ \
/* Floating point number printed as hexadecimal number. */ \
const void *ptr; \
int function_done; \
\
if (fspec == NULL) \
{ \
if (__glibc_unlikely ((mode_flags & PRINTF_LDBL_IS_DBL) != 0)) \
is_long_double = 0; \
\
struct printf_info info = { .prec = prec, \
.width = width, \
.spec = spec, \
.is_long_double = is_long_double, \
.is_short = is_short, \
.is_long = is_long, \
.alt = alt, \
.space = space, \
.left = left, \
.showsign = showsign, \
.group = group, \
.pad = pad, \
.extra = 0, \
.wide = sizeof (CHAR_T) != 1, \
.is_binary128 = 0}; \
\
PARSE_FLOAT_VA_ARG_EXTENDED (info); \
ptr = (const void *) &the_arg; \
\
function_done = __printf_fphex (s, &info, &ptr); \
} \
else \
{ \
ptr = (const void *) &args_value[fspec->data_arg]; \
if (__glibc_unlikely ((mode_flags & PRINTF_LDBL_IS_DBL) != 0)) \
fspec->info.is_long_double = 0; \
SETUP_FLOAT128_INFO (fspec->info); \
\
function_done = __printf_fphex (s, &fspec->info, &ptr); \
} \
\
if (function_done < 0) \
{ \
/* Error in print handler; up to handler to set errno. */ \
done = -1; \
goto all_done; \
} \
\
done_add (function_done); \
} \
break; \
\
LABEL (form_pointer): \
/* Generic pointer. */ \
{ \
const void *ptr; \
if (fspec == NULL) \
ptr = va_arg (ap, void *); \
else \
ptr = args_value[fspec->data_arg].pa_pointer; \
if (ptr != NULL) \
{ \
/* If the pointer is not NULL, write it as a %#x spec. */ \
base = 16; \
number.word = (unsigned long int) ptr; \
is_negative = 0; \
alt = 1; \
group = 0; \
spec = L_('x'); \
goto LABEL (number); \
} \
else \
{ \
/* Write "(nil)" for a nil pointer. */ \
string = (CHAR_T *) L_("(nil)"); \
/* Make sure the full string "(nil)" is printed. */ \
if (prec < 5) \
prec = 5; \
/* This is a wide string iff compiling wprintf. */ \
is_long = sizeof (CHAR_T) > 1; \
goto LABEL (print_string); \
} \
} \
/* NOTREACHED */ \
\
LABEL (form_number): \
if ((mode_flags & PRINTF_FORTIFY) != 0) \
{ \
if (! readonly_format) \
{ \
extern int __readonly_area (const void *, size_t) \
attribute_hidden; \
readonly_format \
= __readonly_area (format, ((STR_LEN (format) + 1) \
* sizeof (CHAR_T))); \
} \
if (readonly_format < 0) \
__libc_fatal ("*** %n in writable segment detected ***\n"); \
} \
/* Answer the count of characters written. */ \
if (fspec == NULL) \
{ \
if (is_longlong) \
*(long long int *) va_arg (ap, void *) = done; \
else if (is_long_num) \
*(long int *) va_arg (ap, void *) = done; \
else if (is_char) \
*(char *) va_arg (ap, void *) = done; \
else if (!is_short) \
*(int *) va_arg (ap, void *) = done; \
else \
*(short int *) va_arg (ap, void *) = done; \
} \
else \
if (is_longlong) \
*(long long int *) args_value[fspec->data_arg].pa_pointer = done; \
else if (is_long_num) \
*(long int *) args_value[fspec->data_arg].pa_pointer = done; \
else if (is_char) \
*(char *) args_value[fspec->data_arg].pa_pointer = done; \
else if (!is_short) \
*(int *) args_value[fspec->data_arg].pa_pointer = done; \
else \
*(short int *) args_value[fspec->data_arg].pa_pointer = done; \
break; \
\
LABEL (form_strerror): \
/* Print description of error ERRNO. */ \
string = \
(CHAR_T *) __strerror_r (save_errno, (char *) work_buffer, \
WORK_BUFFER_SIZE * sizeof (CHAR_T)); \
is_long = 0; /* This is no wide-char string. */ \
goto LABEL (print_string)
#ifdef COMPILE_WPRINTF
# define process_string_arg(fspec) \
LABEL (form_character): \
/* Character. */ \
if (is_long) \
goto LABEL (form_wcharacter); \
--width; /* Account for the character itself. */ \
if (!left) \
PAD (L' '); \
if (fspec == NULL) \
outchar (__btowc ((unsigned char) va_arg (ap, int))); /* Promoted. */ \
else \
outchar (__btowc ((unsigned char) \
args_value[fspec->data_arg].pa_int)); \
if (left) \
PAD (L' '); \
break; \
\
LABEL (form_wcharacter): \
{ \
/* Wide character. */ \
--width; \
if (!left) \
PAD (L' '); \
if (fspec == NULL) \
outchar (va_arg (ap, wchar_t)); \
else \
outchar (args_value[fspec->data_arg].pa_wchar); \
if (left) \
PAD (L' '); \
} \
break; \
\
LABEL (form_string): \
{ \
size_t len; \
\
/* The string argument could in fact be `char *' or `wchar_t *'. \
But this should not make a difference here. */ \
if (fspec == NULL) \
string = (CHAR_T *) va_arg (ap, const wchar_t *); \
else \
string = (CHAR_T *) args_value[fspec->data_arg].pa_wstring; \
\
/* Entry point for printing other strings. */ \
LABEL (print_string): \
\
if (string == NULL) \
{ \
/* Write "(null)" if there's space. */ \
if (prec == -1 || prec >= (int) array_length (null) - 1) \
{ \
string = (CHAR_T *) null; \
len = array_length (null) - 1; \
} \
else \
{ \
string = (CHAR_T *) L""; \
len = 0; \
} \
} \
else if (!is_long && spec != L_('S')) \
{ \
done = outstring_converted_wide_string \
(s, (const char *) string, prec, width, left, done); \
if (done < 0) \
goto all_done; \
/* The padding has already been written. */ \
break; \
} \
else \
{ \
if (prec != -1) \
/* Search for the end of the string, but don't search past \
the length specified by the precision. */ \
len = __wcsnlen (string, prec); \
else \
len = __wcslen (string); \
} \
\
if ((width -= len) < 0) \
{ \
outstring (string, len); \
break; \
} \
\
if (!left) \
PAD (L' '); \
outstring (string, len); \
if (left) \
PAD (L' '); \
} \
break;
#else
# define process_string_arg(fspec) \
LABEL (form_character): \
/* Character. */ \
if (is_long) \
goto LABEL (form_wcharacter); \
--width; /* Account for the character itself. */ \
if (!left) \
PAD (' '); \
if (fspec == NULL) \
outchar ((unsigned char) va_arg (ap, int)); /* Promoted. */ \
else \
outchar ((unsigned char) args_value[fspec->data_arg].pa_int); \
if (left) \
PAD (' '); \
break; \
\
LABEL (form_wcharacter): \
{ \
/* Wide character. */ \
char buf[MB_LEN_MAX]; \
mbstate_t mbstate; \
size_t len; \
\
memset (&mbstate, '\0', sizeof (mbstate_t)); \
len = __wcrtomb (buf, (fspec == NULL ? va_arg (ap, wchar_t) \
: args_value[fspec->data_arg].pa_wchar), \
&mbstate); \
if (len == (size_t) -1) \
{ \
/* Something went wrong during the conversion. Bail out. */ \
done = -1; \
goto all_done; \
} \
width -= len; \
if (!left) \
PAD (' '); \
outstring (buf, len); \
if (left) \
PAD (' '); \
} \
break; \
\
LABEL (form_string): \
{ \
size_t len; \
\
/* The string argument could in fact be `char *' or `wchar_t *'. \
But this should not make a difference here. */ \
if (fspec == NULL) \
string = (char *) va_arg (ap, const char *); \
else \
string = (char *) args_value[fspec->data_arg].pa_string; \
\
/* Entry point for printing other strings. */ \
LABEL (print_string): \
\
if (string == NULL) \
{ \
/* Write "(null)" if there's space. */ \
if (prec == -1 || prec >= (int) sizeof (null) - 1) \
{ \
string = (char *) null; \
len = sizeof (null) - 1; \
} \
else \
{ \
string = (char *) ""; \
len = 0; \
} \
} \
else if (!is_long && spec != L_('S')) \
{ \
if (prec != -1) \
/* Search for the end of the string, but don't search past \
the length (in bytes) specified by the precision. */ \
len = __strnlen (string, prec); \
else \
len = strlen (string); \
} \
else \
{ \
done = outstring_converted_wide_string \
(s, (const wchar_t *) string, prec, width, left, done); \
if (done < 0) \
goto all_done; \
/* The padding has already been written. */ \
break; \
} \
\
if ((width -= len) < 0) \
{ \
outstring (string, len); \
break; \
} \
\
if (!left) \
PAD (' '); \
outstring (string, len); \
if (left) \
PAD (' '); \
} \
break;
#endif
/* Helper function to provide temporary buffering for unbuffered streams. */
static int buffered_vfprintf (FILE *stream, const CHAR_T *fmt, va_list,
unsigned int)
__THROW __attribute__ ((noinline));
/* Handle positional format specifiers. */
static int printf_positional (FILE *s,
const CHAR_T *format, int readonly_format,
va_list ap, va_list *ap_savep, int done,
int nspecs_done, const UCHAR_T *lead_str_end,
CHAR_T *work_buffer, int save_errno,
const char *grouping,
THOUSANDS_SEP_T thousands_sep,
unsigned int mode_flags);
/* Handle unknown format specifier. */
static int printf_unknown (FILE *, const struct printf_info *,
const void *const *) __THROW;
/* Group digits of number string. */
static CHAR_T *group_number (CHAR_T *, CHAR_T *, CHAR_T *, const char *,
THOUSANDS_SEP_T);
/* The function itself. */
int
vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
{
/* The character used as thousands separator. */
THOUSANDS_SEP_T thousands_sep = 0;
/* The string describing the size of groups of digits. */
const char *grouping;
/* Place to accumulate the result. */
int done;
/* Current character in format string. */
const UCHAR_T *f;
/* End of leading constant string. */
const UCHAR_T *lead_str_end;
/* Points to next format specifier. */
const UCHAR_T *end_of_spec;
/* Buffer intermediate results. */
CHAR_T work_buffer[WORK_BUFFER_SIZE];
CHAR_T *workend;
/* We have to save the original argument pointer. */
va_list ap_save;
/* Count number of specifiers we already processed. */
int nspecs_done;
/* For the %m format we may need the current `errno' value. */
int save_errno = errno;
/* 1 if format is in read-only memory, -1 if it is in writable memory,
0 if unknown. */
int readonly_format = 0;
/* Orient the stream. */
#ifdef ORIENT
ORIENT;
#endif
/* Sanity check of arguments. */
ARGCHECK (s, format);
#ifdef ORIENT
/* Check for correct orientation. */
if (_IO_vtable_offset (s) == 0
&& _IO_fwide (s, sizeof (CHAR_T) == 1 ? -1 : 1)
!= (sizeof (CHAR_T) == 1 ? -1 : 1))
/* The stream is already oriented otherwise. */
return EOF;
#endif
if (UNBUFFERED_P (s))
/* Use a helper function which will allocate a local temporary buffer
for the stream and then call us again. */
return buffered_vfprintf (s, format, ap, mode_flags);
/* Initialize local variables. */
done = 0;
grouping = (const char *) -1;
#ifdef __va_copy
/* This macro will be available soon in gcc's <stdarg.h>. We need it
since on some systems `va_list' is not an integral type. */
__va_copy (ap_save, ap);
#else
ap_save = ap;
#endif
nspecs_done = 0;
#ifdef COMPILE_WPRINTF
/* Find the first format specifier. */
f = lead_str_end = __find_specwc ((const UCHAR_T *) format);
#else
/* Find the first format specifier. */
f = lead_str_end = __find_specmb ((const UCHAR_T *) format);
#endif
/* Lock stream. */
_IO_cleanup_region_start ((void (*) (void *)) &_IO_funlockfile, s);
_IO_flockfile (s);
/* Write the literal text before the first format. */
outstring ((const UCHAR_T *) format,
lead_str_end - (const UCHAR_T *) format);
/* If we only have to print a simple string, return now. */
if (*f == L_('\0'))
goto all_done;
/* Use the slow path in case any printf handler is registered. */
if (__glibc_unlikely (__printf_function_table != NULL
|| __printf_modifier_table != NULL
|| __printf_va_arg_table != NULL))
goto do_positional;
/* Process whole format string. */
do
{
STEP0_3_TABLE;
STEP4_TABLE;
union printf_arg *args_value; /* This is not used here but ... */
int is_negative; /* Flag for negative number. */
union
{
unsigned long long int longlong;
unsigned long int word;
} number;
int base;
union printf_arg the_arg;
CHAR_T *string; /* Pointer to argument string. */
int alt = 0; /* Alternate format. */
int space = 0; /* Use space prefix if no sign is needed. */
int left = 0; /* Left-justify output. */
int showsign = 0; /* Always begin with plus or minus sign. */
int group = 0; /* Print numbers according grouping rules. */
int is_long_double = 0; /* Argument is long double/ long long int. */
int is_short = 0; /* Argument is short int. */
int is_long = 0; /* Argument is long int. */
int is_char = 0; /* Argument is promoted (unsigned) char. */
int width = 0; /* Width of output; 0 means none specified. */
int prec = -1; /* Precision of output; -1 means none specified. */
/* This flag is set by the 'I' modifier and selects the use of the
`outdigits' as determined by the current locale. */
int use_outdigits = 0;
UCHAR_T pad = L_(' ');/* Padding character. */
CHAR_T spec;
workend = work_buffer + WORK_BUFFER_SIZE;
/* Get current character in format string. */
JUMP (*++f, step0_jumps);
/* ' ' flag. */
LABEL (flag_space):
space = 1;
JUMP (*++f, step0_jumps);
/* '+' flag. */
LABEL (flag_plus):
showsign = 1;
JUMP (*++f, step0_jumps);
/* The '-' flag. */
LABEL (flag_minus):
left = 1;
pad = L_(' ');
JUMP (*++f, step0_jumps);
/* The '#' flag. */
LABEL (flag_hash):
alt = 1;
JUMP (*++f, step0_jumps);
/* The '0' flag. */
LABEL (flag_zero):
if (!left)
pad = L_('0');
JUMP (*++f, step0_jumps);
/* The '\'' flag. */
LABEL (flag_quote):
group = 1;
if (grouping == (const char *) -1)
{
#ifdef COMPILE_WPRINTF
thousands_sep = _NL_CURRENT_WORD (LC_NUMERIC,
_NL_NUMERIC_THOUSANDS_SEP_WC);
#else
thousands_sep = _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);
#endif
grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
if (*grouping == '\0' || *grouping == CHAR_MAX
#ifdef COMPILE_WPRINTF
|| thousands_sep == L'\0'
#else
|| *thousands_sep == '\0'
#endif
)
grouping = NULL;
}
JUMP (*++f, step0_jumps);
LABEL (flag_i18n):
use_outdigits = 1;
JUMP (*++f, step0_jumps);
/* Get width from argument. */
LABEL (width_asterics):
{
const UCHAR_T *tmp; /* Temporary value. */
tmp = ++f;
if (ISDIGIT (*tmp))
{
int pos = read_int (&tmp);
if (pos == -1)
{
__set_errno (EOVERFLOW);
done = -1;
goto all_done;
}
if (pos && *tmp == L_('$'))
/* The width comes from a positional parameter. */
goto do_positional;
}
width = va_arg (ap, int);
/* Negative width means left justified. */
if (width < 0)
{
width = -width;
pad = L_(' ');
left = 1;
}
}
JUMP (*f, step1_jumps);
/* Given width in format string. */
LABEL (width):
width = read_int (&f);
if (__glibc_unlikely (width == -1))
{
__set_errno (EOVERFLOW);
done = -1;
goto all_done;
}
if (*f == L_('$'))
/* Oh, oh. The argument comes from a positional parameter. */
goto do_positional;
JUMP (*f, step1_jumps);
LABEL (precision):
++f;
if (*f == L_('*'))
{
const UCHAR_T *tmp; /* Temporary value. */
tmp = ++f;
if (ISDIGIT (*tmp))
{
int pos = read_int (&tmp);
if (pos == -1)
{
__set_errno (EOVERFLOW);
done = -1;
goto all_done;
}
if (pos && *tmp == L_('$'))
/* The precision comes from a positional parameter. */
goto do_positional;
}
prec = va_arg (ap, int);
/* If the precision is negative the precision is omitted. */
if (prec < 0)
prec = -1;
}
else if (ISDIGIT (*f))
{
prec = read_int (&f);
/* The precision was specified in this case as an extremely
large positive value. */
if (prec == -1)
{
__set_errno (EOVERFLOW);
done = -1;
goto all_done;
}
}
else
prec = 0;
JUMP (*f, step2_jumps);
/* Process 'h' modifier. There might another 'h' following. */
LABEL (mod_half):
is_short = 1;
JUMP (*++f, step3a_jumps);
/* Process 'hh' modifier. */
LABEL (mod_halfhalf):
is_short = 0;
is_char = 1;
JUMP (*++f, step4_jumps);
/* Process 'l' modifier. There might another 'l' following. */
LABEL (mod_long):
is_long = 1;
JUMP (*++f, step3b_jumps);
/* Process 'L', 'q', or 'll' modifier. No other modifier is
allowed to follow. */
LABEL (mod_longlong):
is_long_double = 1;
is_long = 1;
JUMP (*++f, step4_jumps);
LABEL (mod_size_t):
is_long_double = sizeof (size_t) > sizeof (unsigned long int);
is_long = sizeof (size_t) > sizeof (unsigned int);
JUMP (*++f, step4_jumps);
LABEL (mod_ptrdiff_t):
is_long_double = sizeof (ptrdiff_t) > sizeof (unsigned long int);
is_long = sizeof (ptrdiff_t) > sizeof (unsigned int);
JUMP (*++f, step4_jumps);
LABEL (mod_intmax_t):
is_long_double = sizeof (intmax_t) > sizeof (unsigned long int);
is_long = sizeof (intmax_t) > sizeof (unsigned int);
JUMP (*++f, step4_jumps);
/* Process current format. */
while (1)
{
process_arg (((struct printf_spec *) NULL));
process_string_arg (((struct printf_spec *) NULL));
LABEL (form_unknown):
if (spec == L_('\0'))
{
/* The format string ended before the specifier is complete. */
__set_errno (EINVAL);
done = -1;
goto all_done;
}
/* If we are in the fast loop force entering the complicated
one. */
goto do_positional;
}
/* The format is correctly handled. */
++nspecs_done;
/* Look for next format specifier. */
#ifdef COMPILE_WPRINTF
f = __find_specwc ((end_of_spec = ++f));
#else
f = __find_specmb ((end_of_spec = ++f));
#endif
/* Write the following constant string. */
outstring (end_of_spec, f - end_of_spec);
}
while (*f != L_('\0'));
/* Unlock stream and return. */
goto all_done;
/* Hand off processing for positional parameters. */
do_positional:
done = printf_positional (s, format, readonly_format, ap, &ap_save,
done, nspecs_done, lead_str_end, work_buffer,
save_errno, grouping, thousands_sep, mode_flags);
all_done:
/* Unlock the stream. */
_IO_funlockfile (s);
_IO_cleanup_region_end (0);
return done;
}
static int
printf_positional (FILE *s, const CHAR_T *format, int readonly_format,
va_list ap, va_list *ap_savep, int done, int nspecs_done,
const UCHAR_T *lead_str_end,
CHAR_T *work_buffer, int save_errno,
const char *grouping, THOUSANDS_SEP_T thousands_sep,
unsigned int mode_flags)
{
/* For positional argument handling. */
struct scratch_buffer specsbuf;
scratch_buffer_init (&specsbuf);
struct printf_spec *specs = specsbuf.data;
size_t specs_limit = specsbuf.length / sizeof (specs[0]);
/* Used as a backing store for args_value, args_size, args_type
below. */
struct scratch_buffer argsbuf;
scratch_buffer_init (&argsbuf);
/* Array with information about the needed arguments. This has to
be dynamically extensible. */
size_t nspecs = 0;
/* The number of arguments the format string requests. This will
determine the size of the array needed to store the argument
attributes. */
size_t nargs = 0;
/* Positional parameters refer to arguments directly. This could
also determine the maximum number of arguments. Track the
maximum number. */
size_t max_ref_arg = 0;
/* Just a counter. */
size_t cnt;
if (grouping == (const char *) -1)
{
#ifdef COMPILE_WPRINTF
thousands_sep = _NL_CURRENT_WORD (LC_NUMERIC,
_NL_NUMERIC_THOUSANDS_SEP_WC);
#else
thousands_sep = _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);
#endif
grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
if (*grouping == '\0' || *grouping == CHAR_MAX)
grouping = NULL;
}
for (const UCHAR_T *f = lead_str_end; *f != L_('\0');
f = specs[nspecs++].next_fmt)
{
if (nspecs == specs_limit)
{
if (!scratch_buffer_grow_preserve (&specsbuf))
{
done = -1;
goto all_done;
}
specs = specsbuf.data;
specs_limit = specsbuf.length / sizeof (specs[0]);
}
/* Parse the format specifier. */
#ifdef COMPILE_WPRINTF
nargs += __parse_one_specwc (f, nargs, &specs[nspecs], &max_ref_arg);
#else
nargs += __parse_one_specmb (f, nargs, &specs[nspecs], &max_ref_arg);
#endif
}
/* Determine the number of arguments the format string consumes. */
nargs = MAX (nargs, max_ref_arg);
union printf_arg *args_value;
int *args_size;
int *args_type;
{
/* Calculate total size needed to represent a single argument
across all three argument-related arrays. */
size_t bytes_per_arg
= sizeof (*args_value) + sizeof (*args_size) + sizeof (*args_type);
if (!scratch_buffer_set_array_size (&argsbuf, nargs, bytes_per_arg))
{
done = -1;
goto all_done;
}
args_value = argsbuf.data;
/* Set up the remaining two arrays to each point past the end of
the prior array, since space for all three has been allocated
now. */
args_size = &args_value[nargs].pa_int;
args_type = &args_size[nargs];
memset (args_type, (mode_flags & PRINTF_FORTIFY) != 0 ? '\xff' : '\0',
nargs * sizeof (*args_type));
}
/* XXX Could do sanity check here: If any element in ARGS_TYPE is
still zero after this loop, format is invalid. For now we
simply use 0 as the value. */
/* Fill in the types of all the arguments. */
for (cnt = 0; cnt < nspecs; ++cnt)
{
/* If the width is determined by an argument this is an int. */
if (specs[cnt].width_arg != -1)
args_type[specs[cnt].width_arg] = PA_INT;
/* If the precision is determined by an argument this is an int. */
if (specs[cnt].prec_arg != -1)
args_type[specs[cnt].prec_arg] = PA_INT;
switch (specs[cnt].ndata_args)
{
case 0: /* No arguments. */
break;
case 1: /* One argument; we already have the
type and size. */
args_type[specs[cnt].data_arg] = specs[cnt].data_arg_type;
args_size[specs[cnt].data_arg] = specs[cnt].size;
break;
default:
/* We have more than one argument for this format spec.
We must call the arginfo function again to determine
all the types. */
(void) (*__printf_arginfo_table[specs[cnt].info.spec])
(&specs[cnt].info,
specs[cnt].ndata_args, &args_type[specs[cnt].data_arg],
&args_size[specs[cnt].data_arg]);
break;
}
}
/* Now we know all the types and the order. Fill in the argument
values. */
for (cnt = 0; cnt < nargs; ++cnt)
switch (args_type[cnt])
{
#define T(tag, mem, type) \
case tag: \
args_value[cnt].mem = va_arg (*ap_savep, type); \
break
T (PA_WCHAR, pa_wchar, wint_t);
case PA_CHAR: /* Promoted. */
case PA_INT|PA_FLAG_SHORT: /* Promoted. */
#if LONG_MAX == INT_MAX
case PA_INT|PA_FLAG_LONG:
#endif
T (PA_INT, pa_int, int);
#if LONG_MAX == LONG_LONG_MAX
case PA_INT|PA_FLAG_LONG:
#endif
T (PA_INT|PA_FLAG_LONG_LONG, pa_long_long_int, long long int);
#if LONG_MAX != INT_MAX && LONG_MAX != LONG_LONG_MAX
# error "he?"
#endif
case PA_FLOAT: /* Promoted. */
T (PA_DOUBLE, pa_double, double);
case PA_DOUBLE|PA_FLAG_LONG_DOUBLE:
if (__glibc_unlikely ((mode_flags & PRINTF_LDBL_IS_DBL) != 0))
{
args_value[cnt].pa_double = va_arg (*ap_savep, double);
args_type[cnt] &= ~PA_FLAG_LONG_DOUBLE;
}
#if __HAVE_FLOAT128_UNLIKE_LDBL
else if ((mode_flags & PRINTF_LDBL_USES_FLOAT128) != 0)
args_value[cnt].pa_float128 = va_arg (*ap_savep, _Float128);
#endif
else
args_value[cnt].pa_long_double = va_arg (*ap_savep, long double);
break;
case PA_STRING: /* All pointers are the same */
case PA_WSTRING: /* All pointers are the same */
T (PA_POINTER, pa_pointer, void *);
#undef T
default:
if ((args_type[cnt] & PA_FLAG_PTR) != 0)
args_value[cnt].pa_pointer = va_arg (*ap_savep, void *);
else if (__glibc_unlikely (__printf_va_arg_table != NULL)
&& __printf_va_arg_table[args_type[cnt] - PA_LAST] != NULL)
{
args_value[cnt].pa_user = alloca (args_size[cnt]);
(*__printf_va_arg_table[args_type[cnt] - PA_LAST])
(args_value[cnt].pa_user, ap_savep);
}
else
memset (&args_value[cnt], 0, sizeof (args_value[cnt]));
break;
case -1:
/* Error case. Not all parameters appear in N$ format
strings. We have no way to determine their type. */
assert ((mode_flags & PRINTF_FORTIFY) != 0);
__libc_fatal ("*** invalid %N$ use detected ***\n");
}
/* Now walk through all format specifiers and process them. */
for (; (size_t) nspecs_done < nspecs; ++nspecs_done)
{
STEP4_TABLE;
int is_negative;
union
{
unsigned long long int longlong;
unsigned long int word;
} number;
int base;
union printf_arg the_arg;
CHAR_T *string; /* Pointer to argument string. */
/* Fill variables from values in struct. */
int alt = specs[nspecs_done].info.alt;
int space = specs[nspecs_done].info.space;
int left = specs[nspecs_done].info.left;
int showsign = specs[nspecs_done].info.showsign;
int group = specs[nspecs_done].info.group;
int is_long_double = specs[nspecs_done].info.is_long_double;
int is_short = specs[nspecs_done].info.is_short;
int is_char = specs[nspecs_done].info.is_char;
int is_long = specs[nspecs_done].info.is_long;
int width = specs[nspecs_done].info.width;
int prec = specs[nspecs_done].info.prec;
int use_outdigits = specs[nspecs_done].info.i18n;
char pad = specs[nspecs_done].info.pad;
CHAR_T spec = specs[nspecs_done].info.spec;
CHAR_T *workend = work_buffer + WORK_BUFFER_SIZE;
/* Fill in last information. */
if (specs[nspecs_done].width_arg != -1)
{
/* Extract the field width from an argument. */
specs[nspecs_done].info.width =
args_value[specs[nspecs_done].width_arg].pa_int;
if (specs[nspecs_done].info.width < 0)
/* If the width value is negative left justification is
selected and the value is taken as being positive. */
{
specs[nspecs_done].info.width *= -1;
left = specs[nspecs_done].info.left = 1;
}
width = specs[nspecs_done].info.width;
}
if (specs[nspecs_done].prec_arg != -1)
{
/* Extract the precision from an argument. */
specs[nspecs_done].info.prec =
args_value[specs[nspecs_done].prec_arg].pa_int;
if (specs[nspecs_done].info.prec < 0)
/* If the precision is negative the precision is
omitted. */
specs[nspecs_done].info.prec = -1;
prec = specs[nspecs_done].info.prec;
}
/* Process format specifiers. */
while (1)
{
extern printf_function **__printf_function_table;
int function_done;
if (spec <= UCHAR_MAX
&& __printf_function_table != NULL
&& __printf_function_table[(size_t) spec] != NULL)
{
const void **ptr = alloca (specs[nspecs_done].ndata_args
* sizeof (const void *));
/* Fill in an array of pointers to the argument values. */
for (unsigned int i = 0; i < specs[nspecs_done].ndata_args;
++i)
ptr[i] = &args_value[specs[nspecs_done].data_arg + i];
/* Call the function. */
function_done = __printf_function_table[(size_t) spec]
(s, &specs[nspecs_done].info, ptr);
if (function_done != -2)
{
/* If an error occurred we don't have information
about # of chars. */
if (function_done < 0)
{
/* Function has set errno. */
done = -1;
goto all_done;
}
done_add (function_done);
break;
}
}
JUMP (spec, step4_jumps);
process_arg ((&specs[nspecs_done]));
process_string_arg ((&specs[nspecs_done]));
LABEL (form_unknown):
{
unsigned int i;
const void **ptr;
ptr = alloca (specs[nspecs_done].ndata_args
* sizeof (const void *));
/* Fill in an array of pointers to the argument values. */
for (i = 0; i < specs[nspecs_done].ndata_args; ++i)
ptr[i] = &args_value[specs[nspecs_done].data_arg + i];
/* Call the function. */
function_done = printf_unknown (s, &specs[nspecs_done].info,
ptr);
/* If an error occurred we don't have information about #
of chars. */
if (function_done < 0)
{
/* Function has set errno. */
done = -1;
goto all_done;
}
done_add (function_done);
}
break;
}
/* Write the following constant string. */
outstring (specs[nspecs_done].end_of_fmt,
specs[nspecs_done].next_fmt
- specs[nspecs_done].end_of_fmt);
}
all_done:
scratch_buffer_free (&argsbuf);
scratch_buffer_free (&specsbuf);
return done;
}
/* Handle an unknown format specifier. This prints out a canonicalized
representation of the format spec itself. */
static int
printf_unknown (FILE *s, const struct printf_info *info,
const void *const *args)
{
int done = 0;
CHAR_T work_buffer[MAX (sizeof (info->width), sizeof (info->prec)) * 3];
CHAR_T *const workend
= &work_buffer[sizeof (work_buffer) / sizeof (CHAR_T)];
CHAR_T *w;
outchar (L_('%'));
if (info->alt)
outchar (L_('#'));
if (info->group)
outchar (L_('\''));
if (info->showsign)
outchar (L_('+'));
else if (info->space)
outchar (L_(' '));
if (info->left)
outchar (L_('-'));
if (info->pad == L_('0'))
outchar (L_('0'));
if (info->i18n)
outchar (L_('I'));
if (info->width != 0)
{
w = _itoa_word (info->width, workend, 10, 0);
while (w < workend)
outchar (*w++);
}
if (info->prec != -1)
{
outchar (L_('.'));
w = _itoa_word (info->prec, workend, 10, 0);
while (w < workend)
outchar (*w++);
}
if (info->spec != L_('\0'))
outchar (info->spec);
all_done:
return done;
}
/* Group the digits from W to REAR_PTR according to the grouping rules
of the current locale. The interpretation of GROUPING is as in
`struct lconv' from <locale.h>. The grouped number extends from
the returned pointer until REAR_PTR. FRONT_PTR to W is used as a
scratch area. */
static CHAR_T *
group_number (CHAR_T *front_ptr, CHAR_T *w, CHAR_T *rear_ptr,
const char *grouping, THOUSANDS_SEP_T thousands_sep)
{
/* Length of the current group. */
int len;
#ifndef COMPILE_WPRINTF
/* Length of the separator (in wide mode, the separator is always a
single wide character). */
int tlen = strlen (thousands_sep);
#endif
/* We treat all negative values like CHAR_MAX. */
if (*grouping == CHAR_MAX || *grouping <= 0)
/* No grouping should be done. */
return w;
len = *grouping++;
/* Copy existing string so that nothing gets overwritten. */
memmove (front_ptr, w, (rear_ptr - w) * sizeof (CHAR_T));
CHAR_T *s = front_ptr + (rear_ptr - w);
w = rear_ptr;
/* Process all characters in the string. */
while (s > front_ptr)
{
*--w = *--s;
if (--len == 0 && s > front_ptr)
{
/* A new group begins. */
#ifdef COMPILE_WPRINTF
if (w != s)
*--w = thousands_sep;
else
/* Not enough room for the separator. */
goto copy_rest;
#else
int cnt = tlen;
if (tlen < w - s)
do
*--w = thousands_sep[--cnt];
while (cnt > 0);
else
/* Not enough room for the separator. */
goto copy_rest;
#endif
if (*grouping == CHAR_MAX
#if CHAR_MIN < 0
|| *grouping < 0
#endif
)
{
copy_rest:
/* No further grouping to be done. Copy the rest of the
number. */
memmove (w, s, (front_ptr -s) * sizeof (CHAR_T));
break;
}
else if (*grouping != '\0')
len = *grouping++;
else
/* The previous grouping repeats ad infinitum. */
len = grouping[-1];
}
}
return w;
}
/* Helper "class" for `fprintf to unbuffered': creates a temporary buffer. */
struct helper_file
{
struct _IO_FILE_plus _f;
#ifdef COMPILE_WPRINTF
struct _IO_wide_data _wide_data;
#endif
FILE *_put_stream;
#ifdef _IO_MTSAFE_IO
_IO_lock_t lock;
#endif
};
static int
_IO_helper_overflow (FILE *s, int c)
{
FILE *target = ((struct helper_file*) s)->_put_stream;
#ifdef COMPILE_WPRINTF
int used = s->_wide_data->_IO_write_ptr - s->_wide_data->_IO_write_base;
if (used)
{
size_t written = _IO_sputn (target, s->_wide_data->_IO_write_base, used);
if (written == 0 || written == WEOF)
return WEOF;
__wmemmove (s->_wide_data->_IO_write_base,
s->_wide_data->_IO_write_base + written,
used - written);
s->_wide_data->_IO_write_ptr -= written;
}
#else
int used = s->_IO_write_ptr - s->_IO_write_base;
if (used)
{
size_t written = _IO_sputn (target, s->_IO_write_base, used);
if (written == 0 || written == EOF)
return EOF;
memmove (s->_IO_write_base, s->_IO_write_base + written,
used - written);
s->_IO_write_ptr -= written;
}
#endif
return PUTC (c, s);
}
#ifdef COMPILE_WPRINTF
static const struct _IO_jump_t _IO_helper_jumps libio_vtable =
{
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_wdefault_finish),
JUMP_INIT (overflow, _IO_helper_overflow),
JUMP_INIT (underflow, _IO_default_underflow),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wdefault_pbackfail),
JUMP_INIT (xsputn, _IO_wdefault_xsputn),
JUMP_INIT (xsgetn, _IO_wdefault_xsgetn),
JUMP_INIT (seekoff, _IO_default_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_default_setbuf),
JUMP_INIT (sync, _IO_default_sync),
JUMP_INIT (doallocate, _IO_wdefault_doallocate),
JUMP_INIT (read, _IO_default_read),
JUMP_INIT (write, _IO_default_write),
JUMP_INIT (seek, _IO_default_seek),
JUMP_INIT (close, _IO_default_close),
JUMP_INIT (stat, _IO_default_stat)
};
#else
static const struct _IO_jump_t _IO_helper_jumps libio_vtable =
{
JUMP_INIT_DUMMY,
JUMP_INIT (finish, _IO_default_finish),
JUMP_INIT (overflow, _IO_helper_overflow),
JUMP_INIT (underflow, _IO_default_underflow),
JUMP_INIT (uflow, _IO_default_uflow),
JUMP_INIT (pbackfail, _IO_default_pbackfail),
JUMP_INIT (xsputn, _IO_default_xsputn),
JUMP_INIT (xsgetn, _IO_default_xsgetn),
JUMP_INIT (seekoff, _IO_default_seekoff),
JUMP_INIT (seekpos, _IO_default_seekpos),
JUMP_INIT (setbuf, _IO_default_setbuf),
JUMP_INIT (sync, _IO_default_sync),
JUMP_INIT (doallocate, _IO_default_doallocate),
JUMP_INIT (read, _IO_default_read),
JUMP_INIT (write, _IO_default_write),
JUMP_INIT (seek, _IO_default_seek),
JUMP_INIT (close, _IO_default_close),
JUMP_INIT (stat, _IO_default_stat)
};
#endif
static int
buffered_vfprintf (FILE *s, const CHAR_T *format, va_list args,
unsigned int mode_flags)
{
CHAR_T buf[BUFSIZ];
struct helper_file helper;
FILE *hp = (FILE *) &helper._f;
int result, to_flush;
/* Orient the stream. */
#ifdef ORIENT
ORIENT;
#endif
/* Initialize helper. */
helper._put_stream = s;
#ifdef COMPILE_WPRINTF
hp->_wide_data = &helper._wide_data;
_IO_wsetp (hp, buf, buf + sizeof buf / sizeof (CHAR_T));
hp->_mode = 1;
#else
_IO_setp (hp, buf, buf + sizeof buf);
hp->_mode = -1;
#endif
hp->_flags = _IO_MAGIC|_IO_NO_READS|_IO_USER_LOCK;
#if _IO_JUMPS_OFFSET
hp->_vtable_offset = 0;
#endif
#ifdef _IO_MTSAFE_IO
hp->_lock = NULL;
#endif
hp->_flags2 = s->_flags2;
_IO_JUMPS (&helper._f) = (struct _IO_jump_t *) &_IO_helper_jumps;
/* Now print to helper instead. */
result = vfprintf (hp, format, args, mode_flags);
/* Lock stream. */
__libc_cleanup_region_start (1, (void (*) (void *)) &_IO_funlockfile, s);
_IO_flockfile (s);
/* Now flush anything from the helper to the S. */
#ifdef COMPILE_WPRINTF
if ((to_flush = (hp->_wide_data->_IO_write_ptr
- hp->_wide_data->_IO_write_base)) > 0)
{
if ((int) _IO_sputn (s, hp->_wide_data->_IO_write_base, to_flush)
!= to_flush)
result = -1;
}
#else
if ((to_flush = hp->_IO_write_ptr - hp->_IO_write_base) > 0)
{
if ((int) _IO_sputn (s, hp->_IO_write_base, to_flush) != to_flush)
result = -1;
}
#endif
/* Unlock the stream. */
_IO_funlockfile (s);
__libc_cleanup_region_end (0);
return result;
}
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