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      1  1.6     lukem /*	$NetBSD: fgets_chk.c,v 1.6 2009/02/05 05:41:51 lukem Exp $	*/
      2  1.1       tls 
      3  1.1       tls /*-
      4  1.1       tls  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  1.1       tls  * All rights reserved.
      6  1.1       tls  *
      7  1.1       tls  * This code is derived from software contributed to The NetBSD Foundation
      8  1.1       tls  * by Christos Zoulas.
      9  1.1       tls  *
     10  1.1       tls  * Redistribution and use in source and binary forms, with or without
     11  1.1       tls  * modification, are permitted provided that the following conditions
     12  1.1       tls  * are met:
     13  1.1       tls  * 1. Redistributions of source code must retain the above copyright
     14  1.1       tls  *    notice, this list of conditions and the following disclaimer.
     15  1.1       tls  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1       tls  *    notice, this list of conditions and the following disclaimer in the
     17  1.1       tls  *    documentation and/or other materials provided with the distribution.
     18  1.1       tls  *
     19  1.1       tls  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.1       tls  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.1       tls  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.1       tls  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.1       tls  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.1       tls  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.1       tls  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.1       tls  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.1       tls  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.1       tls  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.1       tls  * POSSIBILITY OF SUCH DAMAGE.
     30  1.1       tls  */
     31  1.1       tls #include <sys/cdefs.h>
     32  1.6     lukem __RCSID("$NetBSD: fgets_chk.c,v 1.6 2009/02/05 05:41:51 lukem Exp $");
     33  1.1       tls 
     34  1.1       tls /*LINTLIBRARY*/
     35  1.1       tls 
     36  1.2       tls #include <ssp/ssp.h>
     37  1.1       tls #include <stdio.h>
     38  1.1       tls #include <string.h>
     39  1.1       tls #include <limits.h>
     40  1.1       tls #include <stdlib.h>
     41  1.4  kristerw #include <ssp/stdio.h>
     42  1.1       tls 
     43  1.3  christos #undef fgets
     44  1.3  christos 
     45  1.1       tls char *
     46  1.1       tls __fgets_chk(char * __restrict buf, int len, size_t slen, FILE *fp)
     47  1.1       tls {
     48  1.1       tls 	if (slen >= (size_t)INT_MAX)
     49  1.1       tls 		return fgets(buf, len, fp);
     50  1.1       tls 
     51  1.6     lukem 	if (len >= 0 && (size_t)len > slen)
     52  1.1       tls 		__chk_fail();
     53  1.1       tls 
     54  1.1       tls 	return fgets(buf, len, fp);
     55  1.1       tls }
     56