83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
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/*
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(C) Copyright 2001,2006,
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International Business Machines Corporation,
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Sony Computer Entertainment, Incorporated,
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Toshiba Corporation,
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the names of the copyright holders nor the names of their
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contributors may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <spu_intrinsics.h>
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#include <stddef.h>
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#include <string.h>
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/* Copy the string up to n character from memory area src to
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* memory area dest. The memory areas may not overlap. The
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* strncpy subroutine returns a pointer to dest.
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*/
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char * strncpy(char * __restrict__ dest, const char * __restrict__ src, size_t n)
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{
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size_t len;
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unsigned int cmp, skip, mask;
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vec_uchar16 *ptr, data;
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vec_uint4 cnt, gt, N;
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N = spu_promote(n, 0);
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/* Determine the string length, including termination character,
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* clamped to n characters.
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*/
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ptr = (vec_uchar16 *)src;
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skip = (unsigned int)(ptr) & 15;
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mask = 0xFFFF >> skip;
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data = *ptr++;
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cmp = spu_extract(spu_gather(spu_cmpeq(data, 0)), 0);
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cmp &= mask;
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cnt = spu_cntlz(spu_promote(cmp, 0));
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len = spu_extract(cnt, 0) - (skip + 15);
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gt = spu_cmpgt(spu_promote(len, 0), N);
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while (spu_extract(spu_andc(spu_cmpeq(cnt, 32), gt), 0)) {
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data = *ptr++;
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len -= 16;
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cnt = spu_cntlz(spu_gather(spu_cmpeq(data, 0)));
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len += spu_extract(cnt, 0);
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gt = spu_cmpgt(spu_promote(len, 0), N);
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}
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/* len = MIN(len, n)
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*/
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len = spu_extract(spu_sel(spu_promote(len, 0), N, gt), 0);
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/* Perform a memcpy of the resulting length
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*/
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return ((char *)memcpy((void *)dest, (const void *)src, len));
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}
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