96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/* Copyright (C) 1995-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
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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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#include <wchar.h>
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/* Append no more than N wide-character of SRC onto DEST. */
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wchar_t *
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__wcsncat_chk (wchar_t *dest, const wchar_t *src, size_t n, size_t destlen)
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{
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wchar_t c;
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wchar_t * const s = dest;
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/* Find the end of DEST. */
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do
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{
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if (__glibc_unlikely (destlen-- == 0))
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__chk_fail ();
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c = *dest++;
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}
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while (c != L'\0');
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/* Make DEST point before next character, so we can increment
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it while memory is read (wins on pipelined cpus). */
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++destlen;
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dest -= 2;
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if (n >= 4)
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{
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size_t n4 = n >> 2;
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do
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{
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if (__glibc_unlikely (destlen-- == 0))
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__chk_fail ();
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c = *src++;
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*++dest = c;
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if (c == L'\0')
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return s;
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if (__glibc_unlikely (destlen-- == 0))
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__chk_fail ();
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c = *src++;
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*++dest = c;
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if (c == L'\0')
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return s;
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if (__glibc_unlikely (destlen-- == 0))
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__chk_fail ();
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c = *src++;
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*++dest = c;
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if (c == L'\0')
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return s;
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if (__glibc_unlikely (destlen-- == 0))
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__chk_fail ();
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c = *src++;
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*++dest = c;
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if (c == L'\0')
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return s;
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} while (--n4 > 0);
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n &= 3;
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}
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while (n > 0)
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{
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if (__glibc_unlikely (destlen-- == 0))
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__chk_fail ();
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c = *src++;
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*++dest = c;
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if (c == L'\0')
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return s;
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n--;
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}
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if (c != L'\0')
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{
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if (__glibc_unlikely (destlen-- == 0))
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__chk_fail ();
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*++dest = L'\0';
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}
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return s;
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}
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