mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/* Copyright (C) 1994,1997,1999-2004,2006,2009 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
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 _IO_strn_overflow (_IO_FILE *fp, int c) __THROW;
|
|
|
|
static int
|
|
_IO_strn_overflow (fp, c)
|
|
_IO_FILE *fp;
|
|
int c;
|
|
{
|
|
/* When we come to here this means the user supplied buffer is
|
|
filled. But since we must return the number of characters which
|
|
would have been written in total we must provide a buffer for
|
|
further use. We can do this by writing on and on in the overflow
|
|
buffer in the _IO_strnfile structure. */
|
|
_IO_strnfile *snf = (_IO_strnfile *) fp;
|
|
|
|
if (fp->_IO_buf_base != snf->overflow_buf)
|
|
{
|
|
/* Terminate the string. We know that there is room for at
|
|
least one more character since we initialized the stream with
|
|
a size to make this possible. */
|
|
*fp->_IO_write_ptr = '\0';
|
|
|
|
INTUSE(_IO_setb) (fp, snf->overflow_buf,
|
|
snf->overflow_buf + sizeof (snf->overflow_buf), 0);
|
|
|
|
fp->_IO_write_base = snf->overflow_buf;
|
|
fp->_IO_read_base = snf->overflow_buf;
|
|
fp->_IO_read_ptr = snf->overflow_buf;
|
|
fp->_IO_read_end = snf->overflow_buf + sizeof (snf->overflow_buf);
|
|
}
|
|
|
|
fp->_IO_write_ptr = snf->overflow_buf;
|
|
fp->_IO_write_end = snf->overflow_buf;
|
|
|
|
/* Since we are not really interested in storing the characters
|
|
which do not fit in the buffer we simply ignore it. */
|
|
return c;
|
|
}
|
|
|
|
|
|
const struct _IO_jump_t _IO_strn_jumps attribute_hidden =
|
|
{
|
|
JUMP_INIT_DUMMY,
|
|
JUMP_INIT(finish, _IO_str_finish),
|
|
JUMP_INIT(overflow, _IO_strn_overflow),
|
|
JUMP_INIT(underflow, INTUSE(_IO_str_underflow)),
|
|
JUMP_INIT(uflow, INTUSE(_IO_default_uflow)),
|
|
JUMP_INIT(pbackfail, INTUSE(_IO_str_pbackfail)),
|
|
JUMP_INIT(xsputn, INTUSE(_IO_default_xsputn)),
|
|
JUMP_INIT(xsgetn, INTUSE(_IO_default_xsgetn)),
|
|
JUMP_INIT(seekoff, INTUSE(_IO_str_seekoff)),
|
|
JUMP_INIT(seekpos, _IO_default_seekpos),
|
|
JUMP_INIT(setbuf, _IO_default_setbuf),
|
|
JUMP_INIT(sync, _IO_default_sync),
|
|
JUMP_INIT(doallocate, INTUSE(_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)
|
|
};
|
|
|
|
|
|
int
|
|
_IO_vsnprintf (string, maxlen, format, args)
|
|
char *string;
|
|
_IO_size_t maxlen;
|
|
const char *format;
|
|
_IO_va_list args;
|
|
{
|
|
_IO_strnfile sf;
|
|
int ret;
|
|
#ifdef _IO_MTSAFE_IO
|
|
sf.f._sbf._f._lock = NULL;
|
|
#endif
|
|
|
|
/* We need to handle the special case where MAXLEN is 0. Use the
|
|
overflow buffer right from the start. */
|
|
if (maxlen == 0)
|
|
{
|
|
string = sf.overflow_buf;
|
|
maxlen = sizeof (sf.overflow_buf);
|
|
}
|
|
|
|
_IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
|
|
_IO_JUMPS (&sf.f._sbf) = &_IO_strn_jumps;
|
|
string[0] = '\0';
|
|
_IO_str_init_static_internal (&sf.f, string, maxlen - 1, string);
|
|
ret = INTUSE(_IO_vfprintf) (&sf.f._sbf._f, format, args);
|
|
|
|
if (sf.f._sbf._f._IO_buf_base != sf.overflow_buf)
|
|
*sf.f._sbf._f._IO_write_ptr = '\0';
|
|
return ret;
|
|
}
|
|
ldbl_weak_alias (_IO_vsnprintf, __vsnprintf)
|
|
ldbl_weak_alias (_IO_vsnprintf, vsnprintf)
|