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71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
/* Copyright (C) 1991, 1995, 1997, 1998, 2004 Free Software Foundation, Inc.
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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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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <stdarg.h>
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#include <stdio.h>
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#include "../libio/libioP.h"
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#include "../libio/strfile.h"
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extern const struct _IO_jump_t _IO_strn_jumps attribute_hidden;
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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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__vsnprintf_chk (char *s, size_t maxlen, int flags, size_t slen,
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const char *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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if (__builtin_expect (slen < maxlen, 0))
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__chk_fail ();
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_IO_strnfile sf;
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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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if (maxlen == 0)
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{
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s = sf.overflow_buf;
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maxlen = sizeof (sf.overflow_buf);
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}
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_IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
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_IO_JUMPS ((struct _IO_FILE_plus *) &sf.f._sbf) = &_IO_strn_jumps;
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s[0] = '\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_str_init_static_internal (&sf.f, s, maxlen - 1, s);
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ret = INTUSE(_IO_vfprintf) ((_IO_FILE *) &sf.f._sbf, format, args);
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if (sf.f._sbf._f._IO_buf_base != sf.overflow_buf)
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*sf.f._sbf._f._IO_write_ptr = '\0';
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return ret;
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}
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libc_hidden_def (__vsnprintf_chk)
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