75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
|
/* $NetBSD: gets_chk.c,v 1.1 2006/11/08 19:52:11 christos Exp $ */
|
||
|
|
|
||
|
|
/*-
|
||
|
|
* Copyright (c) 2006 The NetBSD Foundation, Inc.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
||
|
|
* by Christos Zoulas.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
* 3. All advertising materials mentioning features or use of this software
|
||
|
|
* must display the following acknowledgement:
|
||
|
|
* This product includes software developed by the NetBSD
|
||
|
|
* Foundation, Inc. and its contributors.
|
||
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
||
|
|
* contributors may be used to endorse or promote products derived
|
||
|
|
* from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
||
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
||
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
#include <sys/cdefs.h>
|
||
|
|
__RCSID("$NetBSD: gets_chk.c,v 1.1 2006/11/08 19:52:11 christos Exp $");
|
||
|
|
|
||
|
|
#include <ssp.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <limits.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
char *
|
||
|
|
__gets_chk(char * __restrict buf, size_t slen)
|
||
|
|
{
|
||
|
|
char *abuf;
|
||
|
|
size_t len;
|
||
|
|
|
||
|
|
if (slen >= (size_t)INT_MAX)
|
||
|
|
return gets(buf);
|
||
|
|
|
||
|
|
if ((abuf = malloc(slen + 1)) == NULL)
|
||
|
|
return gets(buf);
|
||
|
|
|
||
|
|
if (fgets(abuf, (int)(slen + 1), stdin) == NULL)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
len = strlen(abuf);
|
||
|
|
if (len > 0 && abuf[len - 1] == '\n')
|
||
|
|
--len;
|
||
|
|
|
||
|
|
if (len >= slen)
|
||
|
|
__chk_fail();
|
||
|
|
|
||
|
|
(void)memcpy(buf, abuf, len);
|
||
|
|
|
||
|
|
buf[len] = '\0';
|
||
|
|
free(abuf);
|
||
|
|
return buf;
|
||
|
|
}
|