Blame debug/stpncpy_chk.c

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/* Copyright (C) 1993-2018 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, see
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   <http://www.gnu.org/licenses/>.  */
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/* This is almost copied from strncpy.c, written by Torbjorn Granlund.  */
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#include <string.h>
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/* Copy no more than N characters of SRC to DEST, returning the address of
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   the terminating '\0' in DEST, if any, or else DEST + N.  */
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char *
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__stpncpy_chk (char *dest, const char *src, size_t n, size_t destlen)
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{
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  if (__builtin_expect (destlen < n, 0))
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    __chk_fail ();
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  return __stpncpy (dest, src, n);
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}