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87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/* Copyright (C) 1995, 1996, 1997 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <wchar.h>
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/* Copy no more than N wide-characters of SRC to DEST. */
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wchar_t *
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wcsncpy (dest, src, n)
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wchar_t *dest;
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const wchar_t *src;
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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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--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 = n - (dest - s) - 1;
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if (n == 0)
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return 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 s;
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do
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{
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c = *src++;
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*++dest = c;
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if (--n == 0)
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return s;
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}
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while (c != L'\0');
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zero_fill:
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do
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*++dest = L'\0';
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while (--n > 0);
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return s;
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}
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