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/*
* This file is part of the libpayload project.
*
* It has originally been taken from the HelenOS project
* (http://www.helenos.eu), and slightly modified for our purposes.
*
* Copyright (c) 2005 Martin Decky
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <libpayload.h>
void *memset(void *s, int c, size_t n)
{
char *os = s;
while (n--)
*(os++) = c;
return s;
}
void *memcpy(void *dst, const void *src, size_t n)
{
int i;
void *ret = dst;
for(i = 0; i < n % sizeof(unsigned long); i++)
((unsigned char *) dst)[i] = ((unsigned char *) src)[i];
n -= i;
src += i;
dst += i;
for(i = 0; i < n / sizeof(unsigned long); i++)
((unsigned long *) dst)[i] = ((unsigned long *) src)[i];
return ret;
}
void *memmove(void *dst, const void *src, size_t n)
{
int i;
unsigned long offs;
if (src > dst)
return memcpy(dst, src, n);
offs = n - (n % sizeof(unsigned long));
for (i = (n % sizeof(unsigned long)) - 1; i >= 0; i--)
((unsigned char *)dst)[i + offs] =
((unsigned char *)src)[i + offs];
for (i = n / sizeof(unsigned long) - 1; i >= 0; i--)
((unsigned long *)dst)[i] = ((unsigned long *)src)[i];
return dst;
}
/**
* Compare two memory areas.
*
* @param s1 Pointer to the first area to compare.
* @param s2 Pointer to the second area to compare.
* @param len Size of the first area in bytes (both must have the same length).
* @return If len is 0, return zero. If the areas match, return zero.
* Otherwise return non-zero.
*/
int memcmp(const void *s1, const void *s2, size_t len)
{
for (; len && *(char *)s1++ == *(char *)s2++; len--) ;
return len;
}
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