78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#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;
|
|
|
|
/* copy backwards */
|
|
while (n--)
|
|
ptr_d[n] = ptr_s[n];
|
|
|
|
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;
|
|
}
|