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Copy pathmemset.c
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73 lines (66 loc) · 2.17 KB
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/*
* @memset.c
* Implementation of string library functions
*
* Copyright (c) 2011 Parallax, Inc.
* Written by Eric R. Smith, Total Spectrum Software Inc.
* MIT licensed (see terms at end of file)
*/
#include <string.h>
#include <stdint.h>
#include <compiler.h>
#undef memset
/*
* set some memory to a value
*/
#define ALIGNED(a) ( 0 == ( ((sizeof(uint32_t))-1) & ((unsigned)a) ) )
_CACHED
void *
memset(void *dest_p, int c, size_t n)
{
void *orig_dest = dest_p;
char *dst;
/* fill with longs if applicable */
if (ALIGNED(dest_p) && n > sizeof(uint32_t))
{
uint32_t lc;
uint32_t *dstl = dest_p;
c &= 0xff;
lc = (c<<24)|(c<<16)|(c<<8)|c;
while (n >= sizeof(uint32_t))
{
*dstl++ = lc;
n -= sizeof(uint32_t);
}
dest_p = dstl;
}
dst = dest_p;
while (n > 0) {
*dst++ = c;
--n;
}
return orig_dest;
}
/* +--------------------------------------------------------------------
* ¦ TERMS OF USE: MIT License
* +--------------------------------------------------------------------
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
* +--------------------------------------------------------------------
*/