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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2014 Imagination Technologies
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include "string.h"
/*
* Alternative string functions to the default ones are added
* because there is no guarantee that the provided source and
* destination addresses are properly aligned;
* The default string functions work with multiple of 4 bytes
* (sizeof(unsinged long)); MIPS will use LW/SW instructions
* for these operations and if the source and destination
* addresses are not aligned it will trigger an exception.
*/
void *memcpy(void *dest, const void *src, size_t n)
{
u8 *ptr_d = dest;
const u8 *ptr_s = src;
size_t i;
for (i = 0; i < n; i++)
*ptr_d++ = *ptr_s++;
return dest;
}
void *memmove(void *dest, const void *src, size_t n)
{
if ((src < dest) && (dest - src < n)) {
u8 *ptr_d = dest;
const u8 *ptr_s = src;
size_t i;
/* copy backwards */
for (i = n - 1; i >= 0; i--)
ptr_d[i] = ptr_s[i];
return dest;
}
/* copy forwards */
return memcpy(dest, src, n);
}
void *memset(void *s, int c, size_t n)
{
u8 *ptr = s;
size_t i;
for (i = 0; i < n; i++)
*ptr++ = c;
return s;
}
int memcmp(const void *s1, const void *s2, size_t n)
{
size_t i;
for (i = 0; i < n; i++)
if (((u8 *)s1)[i] != ((u8 *)s2)[i])
return ((u8 *)s1)[i] - ((u8 *)s2)[i];
return 0;
}
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