112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/*
|
|
* 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>
|
|
|
|
static void *default_memset(void *s, int c, size_t n)
|
|
{
|
|
char *os = s;
|
|
|
|
while (n--)
|
|
*(os++) = c;
|
|
|
|
return s;
|
|
}
|
|
|
|
void *memset(void *s, int c, size_t n)
|
|
__attribute__((weak, alias("default_memset")));
|
|
|
|
static void *default_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 *memcpy(void *dst, const void *src, size_t n)
|
|
__attribute__((weak, alias("default_memcpy")));
|
|
|
|
static void *default_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;
|
|
}
|
|
|
|
void *memmove(void *dst, const void *src, size_t n)
|
|
__attribute__((weak, alias("default_memmove")));
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
|
|
static int default_memcmp(const void *s1, const void *s2, size_t len)
|
|
{
|
|
for (; len && *(char *)s1++ == *(char *)s2++; len--) ;
|
|
return len;
|
|
}
|
|
|
|
int memcmp(const void *s1, const void *s2, size_t len)
|
|
__attribute__((weak, alias("default_memcmp")));
|
|
|