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d183b96ee6
This patch provides optimized versions of strncpy and wcsncpy with the z13 vector instructions. ChangeLog: * sysdeps/s390/multiarch/strncpy-vx.S: New File. * sysdeps/s390/multiarch/strncpy.c: Likewise. * sysdeps/s390/multiarch/wcsncpy-c.c: Likewise. * sysdeps/s390/multiarch/wcsncpy-vx.S: Likewise. * sysdeps/s390/multiarch/wcsncpy.c: Likewise. * sysdeps/s390/s390-32/multiarch/strncpy.c: Likewise. * sysdeps/s390/s390-64/multiarch/strncpy.c: Likewise. * sysdeps/s390/multiarch/Makefile (sysdep_routines): Add strncpy and wcsncpy functions. * wcsmbs/wcsncpy.c: Use WCSNCPY if defined. * sysdeps/s390/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Add ifunc test for strncpy, wcsncpy. * string/test-strncpy.c: Add wcsncpy support. * wcsmbs/test-wcsncpy.c: New File. * wcsmbs/Makefile (strop-tests): Add wcsncpy. * benchtests/bench-strncpy.c: Add wcsncpy support. * benchtests/bench-wcsncpy.c: New File. * benchtests/Makefile (wcsmbs-bench): Add wcsncpy
92 lines
1.8 KiB
C
92 lines
1.8 KiB
C
/* Copyright (C) 1995-2015 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 WCSNCPY
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# define __wcsncpy WCSNCPY
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#endif
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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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#ifndef WCSNCPY
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weak_alias (__wcsncpy, wcsncpy)
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#endif
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