vsprintf_chk.c   [plain text]

/*
 * Copyright (c) 2007-2013 Apple Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_LICENSE_HEADER_END@
 */

#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <limits.h>
#include "secure.h"

int
__vsprintf_chk (char *dest, int flags, size_t dstlen, const char *format,
		va_list arg)
{
  int done;

  if (__builtin_expect (dstlen > (size_t) INT_MAX, 0))
    done = vsprintf (dest, format, arg);
  else
    {
      done = vsnprintf (dest, dstlen, format, arg);
      if (__builtin_expect (done >= 0 && (size_t) done >= dstlen, 0))
        __chk_fail_overflow ();
    }

  return done;
}