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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;
}
struct along {
unsigned long n;
} __attribute__ ((packed));
static void *unaligned_memcpy(void *dst, const void *src, size_t n)
{
int i, j;
struct along *adst = dst;
const struct along *asrc = src;
for (i = 0; i < n / sizeof(unsigned long); i++)
adst[i].n = asrc[i].n;
for (j = 0; j < n % sizeof(unsigned long); j++)
((unsigned char *)(((unsigned long *)dst) + i))[j] =
((unsigned char *)(((unsigned long *)src) + i))[j];
return (char *)src;
}
void *memcpy(void *dst, const void *src, size_t n)
{
int i, j;
if (((long)dst & (sizeof(long) - 1))
|| ((long)src & (sizeof(long) - 1)))
return unaligned_memcpy(dst, src, n);
for (i = 0; i < n / sizeof(unsigned long); i++)
((unsigned long *)dst)[i] = ((unsigned long *)src)[i];
for (j = 0; j < n % sizeof(unsigned long); j++)
((unsigned char *)(((unsigned long *)dst) + i))[j] =
((unsigned char *)(((unsigned long *)src) + i))[j];
return (char *)src;
}
void *memmove(void *dst, const void *src, size_t n)
{
int i, j;
if (src > dst)
return memcpy(dst, src, n);
for (j = (n % sizeof(unsigned long)) - 1; j >= 0; j--)
((unsigned char *)((unsigned long *)dst))[j] =
((unsigned char *)((unsigned long *)src))[j];
for (i = n / sizeof(unsigned long) - 1; i >= 0; i--)
((unsigned long *)dst)[i] = ((unsigned long *)src)[i];
return (char *)src;
}
/**
* 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 areas 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 char *s1, const char *s2, size_t len)
{
for (; len && *s1++ == *s2++; len--) ;
return len;
}
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