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454a20c875
These functions are about to be added to POSIX, under Austin Group issue 986. The fortified strlcat implementation does not raise SIGABRT if the destination buffer does not contain a null terminator, it just inherits the non-failing regular strlcat behavior. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/* Copy a null-terminated string to a fixed-size buffer, with length checking.
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Copyright (C) 2023 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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<https://www.gnu.org/licenses/>. */
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#include <string.h>
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size_t
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__strlcpy (char *__restrict dest, const char *__restrict src, size_t size)
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{
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size_t src_length = strlen (src);
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if (__glibc_unlikely (src_length >= size))
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{
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if (size > 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 size is usually a
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multiple of a small power of two, so writing it twice
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should be more efficient than copying an odd number of
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bytes. */
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memcpy (dest, src, size);
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dest[size - 1] = '\0';
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}
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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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libc_hidden_def (__strlcpy)
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weak_alias (__strlcpy, strlcpy)
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