79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* $NetBSD: gets_chk.c,v 1.7 2013/10/04 20:49:16 christos Exp $ */
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/*-
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* Copyright (c) 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: gets_chk.c,v 1.7 2013/10/04 20:49:16 christos Exp $");
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/*LINTLIBRARY*/
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#include <ssp/ssp.h>
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <ssp/stdio.h>
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extern char *__gets(char *);
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#undef gets
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#ifdef __NEWLIB__
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#define __gets gets
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#endif
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char *
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__gets_chk(char * __restrict buf, size_t slen)
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{
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char *abuf;
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size_t len;
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if (slen >= (size_t)INT_MAX)
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return __gets(buf);
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if ((abuf = malloc(slen + 1)) == NULL)
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return __gets(buf);
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if (fgets(abuf, (int)(slen + 1), stdin) == NULL) {
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free(abuf);
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return NULL;
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}
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len = strlen(abuf);
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if (len > 0 && abuf[len - 1] == '\n')
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--len;
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if (len >= slen)
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__chk_fail();
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(void)memcpy(buf, abuf, len);
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buf[len] = '\0';
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free(abuf);
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return buf;
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}
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