46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
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// SPDX-License-Identifier: LGPL-2.1-or-later
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/* Copy a null-terminated string to a fixed-size buffer, with length checking.
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* Copyright (C) 2016 Free Software Foundation, Inc.
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* This file is part of the GNU C Library.
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*/
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/* adapted for Quagga from glibc patch submission originally from
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* Florian Weimer <fweimer@redhat.com>, 2016-05-18 */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#ifndef HAVE_STRLCPY
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#undef strlcpy
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size_t strlcpy(char *__restrict dest,
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const char *__restrict src, size_t destsize);
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size_t strlcpy(char *__restrict dest,
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const char *__restrict src, size_t destsize)
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{
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size_t src_length = strlen(src);
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if (__builtin_expect(src_length >= destsize, 0)) {
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if (destsize > 0) {
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/*
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* Copy the leading portion of the string. The last
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* character is subsequently overwritten with the NUL
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* terminator, but the destination destsize is usually
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* a multiple of a small power of two, so writing it
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* twice should be more efficient than copying an odd
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* number of bytes.
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*/
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memcpy(dest, src, destsize);
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dest[destsize - 1] = '\0';
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}
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} else
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/* Copy the string and its terminating NUL character. */
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memcpy(dest, src, src_length + 1);
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return src_length;
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}
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#endif /* HAVE_STRLCPY */
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