mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 19:00:09 +00:00
110 lines
3.8 KiB
C
110 lines
3.8 KiB
C
/* Copyright (C) 1993-2020 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/>.
|
|
|
|
As a special exception, if you link the code in this file with
|
|
files compiled with a GNU compiler to produce an executable,
|
|
that does not cause the resulting executable to be covered by
|
|
the GNU Lesser General Public License. This exception does not
|
|
however invalidate any other reasons why the executable file
|
|
might be covered by the GNU Lesser General Public License.
|
|
This exception applies to code released by its copyright holders
|
|
in files containing the exception. */
|
|
|
|
#include "libioP.h"
|
|
#include "strfile.h"
|
|
|
|
static int __THROW
|
|
_IO_str_chk_overflow (FILE *fp, int c)
|
|
{
|
|
/* If we get here, the user-supplied buffer would be overrun by
|
|
further output. */
|
|
__chk_fail ();
|
|
}
|
|
|
|
static const struct _IO_jump_t _IO_str_chk_jumps libio_vtable =
|
|
{
|
|
JUMP_INIT_DUMMY,
|
|
JUMP_INIT(finish, _IO_str_finish),
|
|
JUMP_INIT(overflow, _IO_str_chk_overflow),
|
|
JUMP_INIT(underflow, _IO_str_underflow),
|
|
JUMP_INIT(uflow, _IO_default_uflow),
|
|
JUMP_INIT(pbackfail, _IO_str_pbackfail),
|
|
JUMP_INIT(xsputn, _IO_default_xsputn),
|
|
JUMP_INIT(xsgetn, _IO_default_xsgetn),
|
|
JUMP_INIT(seekoff, _IO_str_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),
|
|
JUMP_INIT(showmanyc, _IO_default_showmanyc),
|
|
JUMP_INIT(imbue, _IO_default_imbue)
|
|
};
|
|
|
|
/* This function is called by regular vsprintf with maxlen set to -1,
|
|
and by vsprintf_chk with maxlen set to the size of the output
|
|
string. In the former case, _IO_str_chk_overflow will never be
|
|
called; in the latter case it will crash the program if the buffer
|
|
overflows. */
|
|
|
|
int
|
|
__vsprintf_internal (char *string, size_t maxlen,
|
|
const char *format, va_list args,
|
|
unsigned int mode_flags)
|
|
{
|
|
_IO_strfile sf;
|
|
int ret;
|
|
|
|
#ifdef _IO_MTSAFE_IO
|
|
sf._sbf._f._lock = NULL;
|
|
#endif
|
|
_IO_no_init (&sf._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
|
|
/* When called from fortified sprintf/vsprintf, erase the destination
|
|
buffer and try to detect overflows. When called from regular
|
|
sprintf/vsprintf, do not erase the destination buffer, because
|
|
known user code relies on this behavior (even though its undefined
|
|
by ISO C), nor try to detect overflows. */
|
|
if ((mode_flags & PRINTF_CHK) != 0)
|
|
{
|
|
_IO_JUMPS (&sf._sbf) = &_IO_str_chk_jumps;
|
|
string[0] = '\0';
|
|
}
|
|
else
|
|
_IO_JUMPS (&sf._sbf) = &_IO_str_jumps;
|
|
_IO_str_init_static_internal (&sf, string,
|
|
(maxlen == -1) ? -1 : maxlen - 1,
|
|
string);
|
|
|
|
ret = __vfprintf_internal (&sf._sbf._f, format, args, mode_flags);
|
|
|
|
*sf._sbf._f._IO_write_ptr = '\0';
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
__vsprintf (char *string, const char *format, va_list args)
|
|
{
|
|
return __vsprintf_internal (string, -1, format, args, 0);
|
|
}
|
|
|
|
ldbl_strong_alias (__vsprintf, _IO_vsprintf)
|
|
ldbl_weak_alias (__vsprintf, vsprintf)
|