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88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
/* Copyright (C) 1996-2016 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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#ifdef WCPNCPY
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# define __wcpncpy WCPNCPY
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#endif
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/* Copy no more than N wide-characters of SRC to DEST, returning the
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address of the last character written into DEST. */
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wchar_t *
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__wcpncpy (wchar_t *dest, const wchar_t *src, size_t n)
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{
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wint_t c;
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wchar_t *const s = dest;
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if (n >= 4)
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{
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size_t n4 = n >> 2;
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for (;;)
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{
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c = *src++;
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*dest++ = c;
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if (c == L'\0')
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break;
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c = *src++;
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*dest++ = c;
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if (c == L'\0')
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break;
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c = *src++;
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*dest++ = c;
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if (c == L'\0')
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break;
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c = *src++;
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*dest++ = c;
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if (c == L'\0')
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break;
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if (--n4 == 0)
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goto last_chars;
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}
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n -= dest - s;
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goto zero_fill;
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}
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last_chars:
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n &= 3;
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if (n == 0)
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return dest;
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for (;;)
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{
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c = *src++;
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--n;
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*dest++ = c;
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if (c == L'\0')
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break;
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if (n == 0)
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return dest;
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}
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zero_fill:
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while (n-- > 0)
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dest[n] = L'\0';
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return dest - 1;
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}
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#ifndef WCPNCPY
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weak_alias (__wcpncpy, wcpncpy)
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#endif
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