2018-01-01 01:32:25 +01:00
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/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
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2005-07-15 12:32:45 +02:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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2012-02-10 00:18:22 +01:00
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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2005-07-15 12:32:45 +02:00
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#include <stdarg.h>
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#include <wchar.h>
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#include "../libio/libioP.h"
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#include "../libio/strfile.h"
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/* Write formatted output into S, according to the format
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string FORMAT, writing no more than MAXLEN characters. */
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/* VARARGS5 */
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int
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__vswprintf_chk (wchar_t *s, size_t maxlen, int flags, size_t slen,
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const wchar_t *format, va_list args)
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{
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/* XXX Maybe for less strict version do not fail immediately.
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Though, maxlen is supposed to be the size of buffer pointed
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to by s, so a conforming program can't pass such maxlen
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to *snprintf. */
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2014-02-10 14:45:42 +01:00
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if (__glibc_unlikely (slen < maxlen))
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2005-07-15 12:32:45 +02:00
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__chk_fail ();
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_IO_wstrnfile sf;
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struct _IO_wide_data wd;
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int ret;
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#ifdef _IO_MTSAFE_IO
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sf.f._sbf._f._lock = NULL;
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#endif
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/* We need to handle the special case where MAXLEN is 0. Use the
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overflow buffer right from the start. */
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2014-02-10 14:45:42 +01:00
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if (__glibc_unlikely (maxlen == 0))
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2005-07-15 12:32:45 +02:00
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/* Since we have to write at least the terminating L'\0' a buffer
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length of zero always makes the function fail. */
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return -1;
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_IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, 0, &wd, &_IO_wstrn_jumps);
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_IO_fwide (&sf.f._sbf._f, 1);
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s[0] = L'\0';
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/* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
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can only come from read-only format strings. */
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if (flags > 0)
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sf.f._sbf._f._flags2 |= _IO_FLAGS2_FORTIFY;
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_IO_wstr_init_static (&sf.f._sbf._f, s, maxlen - 1, s);
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Add __v*printf_internal with flags arguments
There are a lot more printf variants than there are scanf variants,
and the code for setting up and tearing down their custom FILE
variants around the call to __vf(w)printf is more complicated and
variable. Therefore, I have added _internal versions of all the
v*printf variants, rather than introducing helper routines so that
they can all directly call __vf(w)printf_internal, as was done with
scanf.
As with the scanf changes, in this patch the _internal functions still
look at the environmental mode bits and all callers pass 0 for the
flags parameter.
Several of the affected public functions had _IO_ name aliases that
were not exported (but, in one case, appeared in libio.h anyway);
I was originally planning to leave them as aliases to avoid having
to touch internal callers, but it turns out ldbl_*_alias only work
for exported symbols, so they've all been removed instead. It also
turns out there were hardly any internal callers. _IO_vsprintf and
_IO_vfprintf *are* exported, so those two stick around.
Summary for the changes to each of the affected symbols:
_IO_vfprintf, _IO_vsprintf:
All internal calls removed, thus the internal declarations, as well
as uses of libc_hidden_proto and libc_hidden_def, were also removed.
The external symbol is now exposed via uses of ldbl_strong_alias
to __vfprintf_internal and __vsprintf_internal, respectively.
_IO_vasprintf, _IO_vdprintf, _IO_vsnprintf,
_IO_vfwprintf, _IO_vswprintf,
_IO_obstack_vprintf, _IO_obstack_printf:
All internal calls removed, thus declaration in internal headers
were also removed. They were never exported, so there are no
aliases tying them to the internal functions. I.e.: entirely gone.
__vsnprintf:
Internal calls were always preceded by macros such as
#define __vsnprintf _IO_vsnprintf, and
#define __vsnprintf vsnprintf
The macros were removed and their uses replaced with calls to the
new internal function __vsnprintf_internal. Since there were no
internal calls, the internal declaration was also removed. The
external symbol is preserved with ldbl_weak_alias to ___vsnprintf.
__vfwprintf:
All internal calls converted into calls to __vfwprintf_internal,
thus the internal declaration was removed. The function is now a
wrapper that calls __vfwprintf_internal. The external symbol is
preserved.
__vswprintf:
Similarly, but no external symbol.
__vasprintf, __vdprintf, __vfprintf, __vsprintf:
New internal wrappers. Not exported.
vasprintf, vdprintf, vfprintf, vsprintf, vsnprintf,
vfwprintf, vswprintf,
obstack_vprintf, obstack_printf:
These functions used to be aliases to the respective _IO_* function,
they are now aliases to their respective __* functions.
Tested for powerpc and powerpc64le.
2018-03-07 20:32:01 +01:00
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ret = __vfwprintf_internal ((FILE *) &sf.f._sbf, format, args, 0);
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2005-07-15 12:32:45 +02:00
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if (sf.f._sbf._f._wide_data->_IO_buf_base == sf.overflow_buf)
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/* ISO C99 requires swprintf/vswprintf to return an error if the
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output does not fit int he provided buffer. */
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return -1;
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/* Terminate the string. */
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*sf.f._sbf._f._wide_data->_IO_write_ptr = '\0';
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return ret;
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}
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libc_hidden_def (__vswprintf_chk)
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